1
FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
HERMETIC COMPRESSOR, REFRIGERATION CYCLE APPARATUS, AND METHOD
OF MANUFACTURING HERMETIC COMPRESSOR;
MITSUBISHI ELECTRIC CORPORATION, A CORPORATION ORGANISED AND
EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 7-3, MARUNOUCHI
2-CHOME, CHIYODA-KU, TOKYO 100-8310, JAPAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION
AND THE MANNER IN WHICH IT IS TO BE PERFORMED.
2
DESCRIPTION
Title of Invention
HERMETIC COMPRESSOR, REFRIGERATION CYCLE APPARATUS, AND METHOD
OF MANUFACTURING HERMETIC COMPRESSOR
5 Technical Field
[0001]
The present disclosure relates to a hermetic compressor and a refrigeration cycle
apparatus both for use in, for example, an air-conditioning apparatus, a refrigerator, or a
refrigerating machine, and also to a method of manufacturing the hermetic compressor.
10 Background Art
[0002]
A hermetic compressor includes an annular cylinder housed in a hermetic
container, a rolling piston configured to rotate eccentrically in the cylinder, and a vane
configured to reciprocate in a vane groove provided in the cylinder. The vane is urged
15 by a spring, whereby a distal end portion of the vane is in contact with the rolling
position at all times to partition a space in the cylinder into a low-pressure space and a
high-pressure space. When the rolling piston rotates eccentrically in the cylinder, the
volume of the low-pressure space is reduced and as a result the low-pressure space
changes into a high-pressure space, and refrigerant sucked into the cylinder is
20 compressed.
[0003]
In such a kind of hermetic compressor, a spring configured to urge a vane is
accommodated in a spring insertion hole formed in a cylinder, and is thus held in the
cylinder. In such a manner, in the case where the spring is held in the cylinder, the
25 length of the spring is restricted in the distance between a rear end face of the vane and
an inner peripheral surface of the hermetic container and thus cannot be set longer than
the above distance. Therefore, when the vane moves to the top dead center that is the
rearmost position in the reciprocating movement of the vane, the total length of the
spring reaches a solid length to which the length of the spring decreases when the
3
spring is most greatly contracted. As a result, a greater stress acts on the spring and
thus may cause a fatigue failure of the spring.
[0004]
In view of the above, in a given technique, a space for accommodation of a spring
is provided outside a hermetic container in order to eliminate the 5 restriction on the
length of the spring, and to prevent a fatigue failure of the spring that would be caused
when an excessively great stress is applied to the spring (see, for example, Patent
Literature 1).
Citation List
10 Patent Literature
[0005]
Patent Literature 1: Japanese Unexamined Patent Application Publication No.
Sho 63-16189
Summary of Invention
15 Technical Problem
[0006]
In a hermetic compressor disclosed in Patent Literature 1, a projection container
is jointed to a hermetic container and a spring is directly provided in the projection
container. The projection container projects from the hermetic container toward a
20 location that is opposite to a cylinder in the radial direction of the cylinder. In this
configuration, when the hermetic container and the cylinder are not accurately
assembled, the cylinder and the projection container to be jointed to the hermetic
container are displaced from their proper positions at which their proper relationship is
established. It should be noted that a spring is required to be provided along a
25 direction perpendicular to the central axis of the cylinder. However, when the cylinder
and the projection container are displaced from their proper positions at which their
proper positional relationship is established, a vane whose position is determined with
reference to the cylinder and the spring whose position is determined with reference to
the projection container are also displaced from their proper positions where their
30 proper positional relationship is established.
4
[0007]
The present disclosure is applied to solve the above problem and relates to a
refrigeration cycle apparatus and a hermetic compressor capable of ensuring a
sufficient accuracy in the positional relationship between a spring and a vane, and a
method of manufacturing the hermetic 5 compressor.
Solution to Problem
[0008]
A hermetic compressor according to an embodiment of the present disclosure
includes: a hermetic container;
10 a hollow cylinder that is accommodated in the hermetic container; a rolling piston
configured to eccentrically rotate along an inner peripheral wall of the cylinder; a vane
configured to reciprocate in a radial direction of the cylinder, in a vane groove provided
in the cylinder; a spring configured to urge the vane toward a side where the rolling
piston is provided; a projection container provided at the hermetic container such that
15 the projection container is projected from the hermetic container toward a location
opposite to the cylinder in the radial direction of the cylinder, the projection container
having one end portion joined to the hermetic container, and the projection container
communicating with an inside of the hermetic container, and defining a hermetic space;
and a spring guide in which the spring is fixed, the spring guide being provided in the
20 hermetic space of the projection container. In an outer peripheral wall of the cylinder,
an insertion hole is formed. One end portion of the spring guide is inserted in the
insertion hole of the cylinder, whereby the spring guide is fixed.
Advantageous Effects of Invention
[0009]
25 According to the embodiment of the present disclosure, the spring guide is
directly fixed to the cylinder, and it is therefore possible to ensure that the spring fixed in
the spring guide and the vane provided in the vane groove of the cylinder are accurately
provided at their proper positions at which their proper positional relationship is
established.
30 Brief Description of Drawings
5
[0010]
[Fig. 1] Fig. 1 is a schematic longitudinal sectional view of a hermetic compressor
according to Embodiment 1.
[Fig. 2] Fig. 2 is a schematic sectional view taken along line A-A in Fig. 1.
[Fig. 3] Fig. 3 is a schematic sectional view illustrating a first 5 example of the
configuration of a contact portion where a projection container and a hermetic container
of the hermetic compressor according to Embodiment 1 are in contact with each other.
[Fig. 4] Fig. 4 is a schematic sectional view illustrating a second example of the
configuration of the contact portion where the projection container and the hermetic
10 container of the hermetic compressor according to Embodiment 1 are in contact with
each other.
[Fig. 5] Fig. 5 is a schematic sectional view illustrating a third example of the
configuration of the contact portion where the projection container and the hermetic
container of the hermetic compressor according to Embodiment 1 are in contact with
15 each other.
[Fig. 6] Fig. 6 is a flowchart of manufacturing steps of the hermetic compressor
according to Embodiment 1.
[Fig. 7] Fig. 7 is a schematic sectional view of a modification of the projection
container of the hermetic compressor according to Embodiment 1.
20 [Fig. 8] Fig. 8 is a schematic vertical sectional view of a hermetic compressor
according to Embodiment 2.
[Fig. 9] Fig. 9 is a diagram illustrating a refrigerant circuit of a refrigeration cycle
apparatus according to Embodiment 3.
Description of Embodiments
25 [0011]
A hermetic compressor 100 according to Embodiment 1 and a hermetic
compressor 110 according to Embodiment 2 will be described with reference to the
drawings, etc. It should be noted that in figures including Fig. 1 that will be referred to
below, relationships in relative size between components, the sizes of the components,
30 etc., may be different from those of actual components. Also, in each of the figures,
6
components that are the same as or equivalent to those in a previous figure or previous
figures are denoted by the same reference signs, and the same is true of the entire text
of the specification. Furthermore, in order that the embodiments be more easily
understood, terms related to directions (for example, "up", "down", "forward", and
"rearward") are used as appropriate. However, these terms are 5 merely used as a
matter of convenience for explanation and do not limit the locations and the orientations
of apparatuses or components.
[0012]
Embodiment 1
10 [Hermetic Compressor 100]
Fig. 1 is a schematic vertical sectional view of a hermetic compressor according
to Embodiment 1. Fig. 2 is a schematic sectional view taken along line A-A in Fig. 1.
Fig. 2 illustrates the section taken along line A-A, as viewed from a position displaced
from the position of the compressor as illustrated by Fig. 1 through 90 degrees in a
15 counterclockwise direction.
For example, the hermetic compressor 100 is one of components forming a
refrigeration cycle circuit for use in an air-conditioning apparatus, a refrigerator, a
refrigerating machine, a vending machine, a hot-water supply apparatus, or other
apparatuses. The hermetic compressor 100 is a twin rotary compressor including two
20 compression chambers. The hermetic compressor 100 includes a hermetic container
10, a motor mechanism module 20, and a compression mechanism module 30. The
motor mechanism module 20 and the compression mechanism module 30 are
accommodated in the hermetic container 10. Furthermore, the hermetic compressor
100 includes an accumulator 13 and suction pipes 11. The accumulator 13 is provided
25 outside the hermetic container 10, and the suction pipes 11 connect the hermetic
container 10 and the accumulator 13. In addition, the hermetic compressor 100
includes a projection container 50 that accommodates springs 36 and defines a
hermetic space 50e. The springs 36 urge respective vanes 35, which will be described
later. The hermetic space 50e communicates with the hermetic container 10.
30 [0013]
7
(Hermetic Container 10)
The hermetic container 10 forms an outer body of the hermetic compressor 100
and is made of iron material. The hermetic container 10 includes a middle container
10a, an upper container 10b, and a lower container 10c. The middle container 10a has
a substantially cylindrical shape, the upper container 10b closes an 5 upper opening of
the middle container 10a, and the lower container 10c closes a lower opening of the
middle container 10a. The upper container 10b is fitted in the upper opening of the
middle container 10a and the lower container 10c is fitted in the lower opening of the
middle container 10a, whereby the hermetic container 10 is kept in a hermetic state.
10 The hermetic container 10 is provided on a base 14. The lower container 10c is fixed
to the base 14. The base 14 is fixed at a predetermined location by a bolt or other
members, whereby the hermetic compressor 100 is installed.
[0014]
The suction pipes 11 attached to the accumulator 13 is connected to the middle
15 container 10a. A discharge pipe 12 is connected to the upper container 10b. The
suction pipes 11 are connection pipes for supplying low-temperature and low-pressure
gas refrigerant sucked via the accumulator 13 into the compression mechanism module
30. The discharge pipe 12 is a connection pipe for discharging, to the outside of the
hermetic container 10, high-temperature and high-pressure gas refrigerant in the
20 hermetic container 10 that is compressed by the compression mechanism module 30.
[0015]
(Motor Mechanism Module 20)
In the hermetic container 10, the motor mechanism module 20 rotates a rotating
shaft 32. In the hermetic container 10, the motor mechanism module 20 is provided
25 above the compression mechanism module 30. The motor mechanism module 20
includes a stator 21 and a rotor 22. The stator 21 is fixed to an inner peripheral wall of
the middle container 10a, and the rotor 22 is rotatably fitted to an inner periphery of the
stator 21. For example, the stator 21 is fixed to the middle container 10a of the
hermetic container 10 by shrink fitting, welding, or other fixing methods. The rotating
30 shaft 32 is fixed to a central portion of the rotor 22. The rotating shaft 32 extends
8
downward from the motor mechanism module 20. The stator 21 rotates the rotor 22
when being supplied with electric power from the outside of the hermetic compressor
100.
[0016]
(Compression Mechanism 5 Module 30)
The compression mechanism module 30 is accommodated in the hermetic
container 10 to compress refrigerant that flows into the hermetic container 10. The
compression mechanism module 30 is provided below the motor mechanism module 20
and is fixed to the middle container 10a. The compression mechanism module 30
10 includes two compression mechanisms, an upper bearing 38, a lower bearing 39, and a
partition plate 37. The compression mechanisms are arranged in the axial direction of
the rotating shaft 32. Each of the compression mechanisms includes a hollow cylinder
31, a rolling piston 33, the vane 35, the spring 36, and a spring guide 40 that has a
cylindrical shape and accommodates the spring 36 therein. The two spring guides 40
15 are provided in the projection container 50. The projection container 50 is provided at
the hermetic container 10 such that the projection container 50 projects from the
hermetic container 10 toward a location that is opposite to the cylinder 31 in the radial
direction of the cylinder 31. The cylinder 31 of the upper one of the compression
mechanisms will be referred to as an upper cylinder 31A, and the cylinder 31 of the
20 lower one of the compression mechanisms will be referred to as a lower cylinder 31B.
[0017]
In the hermetic container 10, the upper cylinder 31A is provided above the lower
cylinder 31B. On the top of the upper cylinder 31A, the upper bearing 38 is provided in
contact with an upper end face of the upper cylinder 31A to close the upper end face of
25 the upper cylinder 31A. On the bottom of the lower cylinder 31B, the lower bearing 39
is provided in contact with a lower end face of the lower cylinder 31B to close the lower
end face of the lower cylinder 31B. The partition plate 37 is provided between the
upper cylinder 31A and the lower cylinder 31B and closes a lower end face of the upper
cylinder 31A and an upper end face of the lower cylinder 31B.
30 [0018]
9
As illustrated in Fig. 2 to be referred to later, the upper cylinder 31A and the lower
cylinder 31B each have a suction hole 34 and a discharge hole 34B that are located on
respective sides, with a vane groove 31e interposed between the suction hole 34 and
the discharge hole 34B in a circumferential direction. A suction pipe 11A is connected
with the suction hole 34 of the upper cylinder 31A. A suction pipe 5 11B is connected
with the suction hole 34 of the lower cylinder 31B. The suction pipe 11 as described
above is a general term for each of the suction pipe 11A and the suction pipe 11B. The
discharge hole 34B is formed to extend outwardly from an inner peripheral wall 31b of
the cylinder 31 in the radial direction thereof, and communicates with a space in the
10 hermetic container 10 via a discharge hole (not illustrated) formed in the upper bearing
38.
[0019]
The rotating shaft 32 includes eccentric portions 32a that are eccentric to each
other in the radial direction of the rotating shaft 32 and are located closer to one end
15 portion of the rotating shaft 32 in the axial direction. The other end portion of the
rotating shaft 32 in the axial direction is inserted in a central portion of the rotor 22 of the
motor mechanism module 20, whereby the rotating shaft 32 is fixed. The rotating shaft
32 is supported by the upper bearing 38 and the lower bearing 39 such that the rotating
shaft 32 can rotate along with the rotor 22.
20 [0020]
The spring guides 40 are provided to project outwardly from the hermetic
container 10. The springs 36 are accommodated in and fixed to the respective spring
guides 40. The spring guides 40 are provided in association with respective cylinders,
that is, the upper cylinder 31A and the lower cylinder 31B, and are accommodated in
25 the projection container 50.
[0021]
The configuration of the compression mechanism module 30 will be further
described with reference to Figs. 1 and 2. The relationship between the rolling piston
33, the vane 35, the spring 36, and the spring guide 40 in the upper cylinder 31A is the
30 same as the relationship between the rolling piston 33, the vane 35, the spring 36, and
10
the spring guide 40 in the lower cylinder 31B. Thus, the upper cylinder 31A and the
lower cylinder 31B will not be described separately, that is, the cylinder 31, which is a
general term for each of the upper cylinder 31A and the lower cylinder 31B, will be
described. In Fig. 2, illustration of the eccentric portion 32a provided in the cylinder 31
5 is omitted.
[0022]
As illustrated in Fig. 2, the cylinder 31 is hollow. The cylinder 31 includes therein
a cylinder chamber 31d that is concentric with the rotating shaft 32. The rolling piston
33 is provided in the cylinder chamber 31d. The inner peripheral wall 31b of the
10 cylinder 31 faces an outer peripheral wall 33a of the rolling piston 33, which has a
cylindrical shape.
[0023]
The rolling piston 33 has a cylindrical shape. The rolling piston 33 is located
eccentric relative to a central axis C of the rotating shaft 32. In the cylinder chamber
15 31d, the rolling piston 33 is fitted to the eccentric portion 32a of the rotating shaft 32
such that the rolling piston 33 can rotate along with the rotating shaft 32. The rolling
piston 33 is eccentrically rotated along the inner peripheral wall 31b of the cylinder 31
by rotation of the rotating shaft 32.
[0024]
20 In the cylinder 31, the vane groove 31e is formed to communicate with the
cylinder chamber 31d and extend in the radial direction of the cylinder 31. The vane
35 is provided in the vane groove 31e such that the vane 35 can move forward and
backward in the radial direction of the cylinder. In the vane groove 31e, the vane 35
can be slid. An insertion hole 31g is formed outward of the vane groove 31e in the
25 radial direction of the cylinder to communicate with the vane groove 31e. The insertion
hole 31g is formed to extend from the vane groove 31e to an outer peripheral wall 31f of
the cylinder 31.
[0025]
The spring 36 is insert into the insertion hole 31g from an outer region in which
30 the outer peripheral wall 31f is located, and is set in the insertion hole 31g. The spring
11
36 urges the vane 35 provided in the vane groove 31e toward the rolling piston 33 to
bring a distal end portion 35a of the vane 35 into contact with the rolling piston 33. The
vane 35 is pressed inwardly by an urging force of the spring 36 in the radial direction of
the cylinder, whereby the distal end portion 35a of the vane 35 is kept in contact with the
rolling piston 33 all at times. Since the distal end portion 35a of 5 the vane 35 is in
contact with the rolling piston 33 in the above manner, the inside of the cylinder
chamber 31d is partitioned into a suction chamber 31d1 that communicates with the
suction hole 34 and a compression chamber 31d2 that communicates with the
discharge hole 34B. When the rolling piston 33 is eccentrically rotated in the cylinder
10 chamber 31d, the vane 35 is reciprocated in the vane groove 31e, with the distal end
portion 35a kept in contact with the outer peripheral wall 33a of the rolling piston 33.
[0026]
The insertion hole 31g includes an outer peripheral insertion hole 31g2 and an
inner peripheral insertion hole 31g1. The outer peripheral insertion hole 31g2 is
15 formed closer to the outer peripheral wall 31f of the cylinder 31, and the inner peripheral
insertion hole 31g1 is formed closer to the inner peripheral wall 31b of the cylinder 31,
that is, closer to the vane groove 31e. The outer peripheral insertion hole 31g2 and
the inner peripheral insertion hole 31g1 both have circular sectional shapes. Where
D is the diameter of the outer peripheral insertion hole 31g2 and d is the diameter of
20 the inner peripheral insertion hole 31g1, d is smaller than D (d < D). That is, the
insertion hole 31g includes a plurality of portions that have different diameters and
extend from the outer peripheral wall 31f of the cylinder 31 toward the inner peripheral
wall 31b of the cylinder 31 in the direction along the central axis of the insertion hole
31g. The insertion hole 31g is formed between the vane groove 31e and the outer
25 peripheral wall 31f of the cylinder 31 such that the diameter of the insertion hole 31g
decreases toward the vane 31e. The central axis of the outer peripheral insertion hole
31g2 and the central axis of the inner peripheral insertion hole 31g1 coincide with each
other; that is, the outer peripheral insertion hole 31g2 and the inner peripheral insertion
hole 31g1 are coaxial with each other. Both these central axes cross the central axis C
30 of the rotating shaft 32, which extends perpendicular to the plane of the figure.
12
[0027]
The spring 36 is provided in the spring guide 40. The spring 36 is provided
along a direction perpendicular to the central axis C of the cylinder 31. One end
portion 36a of the spring 36 in the length direction thereof is attached to a rear end
portion 35b of the vane 35. The other end portion 36b of the spring 5 36 in the length
direction is fixed to a bottom cover 40c (which will be described later) of the spring guide
40. That is, the spring 36 is provided between the rear end portion 35b of the vane 35
and the bottom cover 40c of the spring guide 40.
[0028]
10 The spring 36 is a helical compression spring that generates a reactive force
when being compressed, and is a cylindrical spring. Preferably, the spring 36 should
be a cylindrical spring, but is not limited to the cylindrical spring.
[0029]
Coils of the spring 36 may have the same outside diameter in the length direction
15 or may have different outside diameters in the length direction. In the case where the
spring 36 is formed such that the coils have different outside diameters, it is conceivable
that the other end portion 36b of the spring 36 has a diameter larger than that of any of
the other portions of the spring 36. In such a manner, in the case where the spring 36
is formed to have a large-diameter portion and a small-diameter portion, the spring 36
20 may be fixed in the spring guide 40 at the large-diameter portion. For example, the
following configuration may be applied: a circumferential groove is formed in an inner
peripheral surface of the spring guide 40 and the large-diameter portion is fitted into this
groove, thereby fixing the spring 36 in the spring guide 40. In such a manner, in the
case where the spring 36 is fixed in the spring guide 40 at the large-diameter portion,
25 the spring guide 40 does not need to include the bottom cover 40c for holding the spring
36 in the spring guide 40. That is, the bottom cover 40c may be omitted.
[0030]
The spring guide 40 is a cylindrical component. One end portion 40a of the
spring guide 40 is inserted into the insertion hole 31g provided in the cylinder 31,
30 whereby the spring guide 40 is fixed. The other end portion 40b of the spring guide 40
13
projects to the outside of the hermetic container 10 through a through hole 10d provided
in the hermetic container 10. The other end portion 40b of the spring guide 40 is
closed by the bottom cover 40c.
[0031]
The spring guide 40 determines a direction in which the spring 5 36 is expanded or
contracted, and guides the spring 36 in the direction in which the spring 36 is expanded
or contracted. In addition, the spring guide 40 restricts movement of the spring 36 in
the radial direction to prevent the axis of the spring 36 from being greatly displaced from
the original position of the axis. Thus, preferably, the space between an inner wall of
10 the spring guide 40 and the coil exterior of the spring 36 should be small. Therefore,
the inner wall of the spring guide 40 is shaped along the coil exterior of the spring 36.
For example, when the spring 36 is a cylindrical spring, the spring guide 40 has an inner
wall whose sectional shape is a circular shape. For example, when the spring 36 is an
oval spring, the spring guide 40 has an inner wall whose sectional shape is an oval
15 shape.
[0032]
The projection container 50 includes a cylindrical portion 51 which has a
cylindrical shape and whose both ends are open, and a projection container cover 52.
One end portion 50a of the cylindrical portion 51 is joined to the through hole 10d
20 formed in the middle container 10a of the hermetic container 10. The cylindrical
portion 51 communicates with the inside of the hermetic container 10. The other end
portion 50b of the cylindrical portion 51 is closed by the projection container cover 52.
As described above, the projection container 50 communicates with the inside of the
hermetic container 10, and the other end portion 50b of the cylindrical portion 51 is
25 closed by the projection container cover 52, thereby providing the hermetic space 50e.
The spring guide 40 is accommodated in the hermetic space 50e. It should be noted
that although one end portion of the cylindrical portion 51 is denoted by the reference
sign “50a”, an end portion of the projection container 50 that is joined to the hermetic
container 10 will hereinafter be also referred to as one end portion 50a.
30 [0033]
14
It should be noted that in existing hermetic compressors, a spring is directly
provided in a projection container that projects from a hermetic container toward a
location opposite to a cylinder in the radial direction of the cylinder, and the projection
container is joined to the hermetic container and more specifically joined to the hermetic
container in a direction perpendicular to the central axis of the hermetic 5 container. In
such a manner, in the existing hermetic compressors, the projection container is joined
to the hermetic container. Thus, in the case where the hermetic container and the
cylinder are not accurately assembled, the cylinder and the projection container joined
to the hermetic container are displaced from their proper positions at which their proper
10 positional relationship is established.
[0034]
It is ideal that the cylinder 31 is fixed in the hermetic container 10 such that the
central axis of the cylinder 31 coincides with the central axis of the hermetic container
10. It is also ideal that the spring 36 is provided along the direction perpendicular to
15 the central axis of the cylinder 31. However, when the accuracy of the above
assembling is low, and for example, the central axis of the cylinder 31 is inclined and
does not coincide with the central axis of the hermetic container 10, the projection
container 50 is inclined relative to the direction perpendicular to the central axis of the
cylinder 31. Thus, in a configuration in which the spring 36 is directly provided in the
20 projection container 50, the spring 36 is also inclined relative to the direction
perpendicular to the central axis of the cylinder 31. In this case, the spring 36 and the
vane 35 are displaced from their proper positions at which their proper positional
relationship is established. If the spring 36 and the vane 35 are displaced from their
proper positions at which their proper positional relationship is established, the spring
25 36 may be torqued when the spring 36 is expanded or contracted. As a result, the
spring 36 may not be expanded or contracted as specified in the design.
[0035]
By contrast, in Embodiment 1, the spring guide 40 is additionally provided in the
projection container 50, and the spring 36 is provided in the spring guide 40. The
30 spring guide 40 is directly fixed to the cylinder 31. That is, the position of the spring 36
15
is set based on the position of the cylinder 31. Thus, at a manufacturing time, even if
the central axis of the cylinder 31 is set to be inclined relative to the central axis of the
hermetic container 10, the spring 36 can be accurately set in the direction perpendicular
to the central axis of the cylinder 31 without being affected by the above inclination.
Therefore, it is possible to ensure a sufficient accuracy in the positions 5 of the spring 36
and the vane 35. As a result, it is possible to prevent, for example, occurrence of
torsion of the spring 36 when the spring 36 is expanded or contracted, and to stably
operate the spring 36.
[0036]
10 Next, it will be described in configuration how the spring guide 40 is fixed to the
cylinder 31.
The one end portion 40a of the spring guide 40 is press-fitted in the outer
peripheral insertion hole 31g2 of the insertion hole 31g formed in the outer peripheral
wall 31f of the cylinder 31, using a seal pipe 31h, which will be described later, whereby
15 the spring guide 40 is fixed to the cylinder 31. The seal pipe 31h is a cylindrical pipe.
Before the above press-fitting, the spring guide 40 and the seal pipe 31h has the
following relationship in size: the outer diameter of the spring guide 40 is smaller than
the inner diameter of the seal pipe 31h; and the outer diameter of the seal pipe 31h is
larger than the inner diameter of the outer peripheral insertion hole 31g2. The seal
20 pipe 31h is press-fitted into the space between an inner peripheral surface of the outer
peripheral insertion hole 31g2 and an outer peripheral surface of the one end portion
40a of the spring guide 40, which is inserted into the outer peripheral insertion hole
31g2, whereby the spring guide 40 is press-fitted into and fixed to the cylinder 31.
[0037]
25 In the case where the spring guide 40 is fixed to the cylinder 31, the inside of the
spring guide 40 and the inner peripheral insertion hole 31g1 of the insertion hole 31g
formed in the cylinder 31 communicate with each other. The inner diameter of the
spring guide 40 and the inner diameter of the inner peripheral insertion hole 31g1 are
equal to each other. The spring guide 40 is fixed to the cylinder 31 such that the
16
central axis of the spring guide 40 and the central axis of the inner peripheral insertion
hole 31g1 coincide with each other.
[0038]
In order to fix the spring 36 to the cylinder 31, in a structure using a plurality of
components, as the number of the components increases, it is harder 5 to ensure that the
spring 36 and the vane 35 are accurately provided at their proper positions at which
their proper positional relationship is established. By contrast, in Embodiment 1, only
the spring guide 40 is used as a component required to fix the spring 36 to the cylinder
31, and it is therefore possible to ensure that the spring 36 and the vane 35 are
10 accurately located at their proper positions at which their proper positional relationship
is established.
[0039]
Next, a method of joining the one end portion 50a of the projection container 50
to the middle container 10a of the hermetic container 10 will be described.
15 The through hole 10d is formed in the middle container 10a of the hermetic
container 10, and the one end portion 50a of the projection container 50 is joined to the
through hole 10d. A contact portion where the one end portion 50a of the projection
container 50 and the middle container 10a of the hermetic container 10 are in contact
with each other is curved. Thus, in the contact portion, a space is easily provided.
20 Therefore, a joining method using brazing or fusion welding easily cause a failure such
blowholes therein. In view of the above, it is preferable that resisting welding be
applied as a method of joining the one end portion 50a of the projection container 50 to
the middle container 10a of the hermetic container 10. The resistance welding is a
welding method that enables welding to be efficiently performed in a short time, and is
25 featured in that heat does not easily affect the above portions, since the welding is
achieved for a short time period. It should be noted that in the case where the
resistance welding is used, it is assumed that the projection container 50 is made of iron
material, as well as the hermetic container 10.
[0040]
17
When the one end portion 50a of the projection container 50 is resistance-welded
to the middle container 10a of the hermetic container 10, preferably, the contact width
between the one end portion 50a of the projection container 50 and the middle
container 10a of the hermetic container 10 should be small. When the contact width is
small, the electrical resistance is increased. Therefore, the temperature 5 of the joint
portion is easily increased even with a low electric current, and joining thereof is
facilitated. Thus, in Embodiment 1, the configuration as illustrated in Fig. 3 or 4 is used
as a configuration of the one end portion 50a of the projection container 50 that reduces
the contact width between the one end portion 50a of the projection container 50 and
10 the middle container 10a of the hermetic container 10.
[0041]
Fig. 3 is a schematic sectional view illustrating a first example of the configuration
of a contact portion where the projection container and the hermetic container of the
hermetic compressor according to Embodiment 1 are in contact with each other.
15 As illustrated in Fig. 3, the one end portion 50a of the projection container 50 is
tapered, and the thickness of the one end portion 50b decreases toward the hermetic
container 10.
[0042]
Fig. 4 is a schematic sectional view illustrating a second example of the
20 configuration of the contact portion where the projection container and the hermetic
container of the hermetic compressor according to Embodiment 1 are in contact with
each other.
As illustrated in Fig. 4, part of an end face 50aa of the one end portion 50a of the
projection container 50 is located inside the through hole 10d of the hermetic container
25 10 as viewed in the direction along an axis 53 of the projection container 50. Thus, the
end face 50aa of the one end portion 50a of the cylindrical portion 51 of the projection
container 50 is not entirely in contact with the hermetic container 10.
[0043]
By virtue of the above configuration, it is possible to reduce the contact width
30 between the one end portion 50a of the projection container 50 and the middle
18
container 10a of the hermetic container 10 and more easily achieve the joining of the
one end portion 50a and the middle container 10a by resistance welding.
[0044]
The one end portion 50a of the projection container 50 can be joined to the
hermetic container 10 by brazing or fusion welding in addition to resistance 5 welding.
Next, an example of the configuration of the contact portion where the projection
container 50 and the hermetic container 10 are in contact with each other in the case
where the joining of the one end portion 50a and the middle container 10a is performed
by brazing or fusion welding is illustrated by Fig. 5.
10 [0045]
Fig. 5 is a schematic sectional view illustrating a third example of the
configuration of the contact portion where the projection container and the hermetic
container of the hermetic compressor according to Embodiment 1 are in contact with
each other.
15 As illustrated in Fig. 5, the middle container 10a of the hermetic container 10
includes a collar 10e that is formed as follows: part of the middle container 10a that is
located around the through hole 10d to which the projection container 50 is joined is
curved such that the above part of the middle container 10a is projected from the
hermetic container 10 toward a location opposite to the cylinder 31 in the radial direction
20 of the cylinder 31. The one end portion 50a of the cylindrical portion 51 of the
projection container 50 is inserted into the collar 10e and is joined to the collar 10e by
brazing or fusion welding. To be more specific, the one end portion 50a of the
cylindrical portion 51 is joined to an inner peripheral surface 10ea of the collar 10e by
brazing or fusion welding. Although it is not illustrated, the one end portion 50a of the
25 cylindrical portion 51 may be widened outwardly and joined to an inner wall surface
10aa of the hermetic container 10. In addition, the one end portion 50a of the
cylindrical portion 51 may be joined to both the inner peripheral surface 10ea of the
collar 10e and the inner wall surface 10aa of the hermetic container 10.
[0046]
19
In such a manner, since the collar 10e is provided around the through hole 10d to
which the projection container 50 is joined, it is possible to ensure a sufficient contact
distance between the collar 10e and the one end portion 50a of the cylindrical portion
51. Thus, even when a joining method using brazing or fusion welding is applied, a
failure such as blowholes does not easily occur. As a result, 5 it is possible to
satisfactorily perform the above joining.
[0047]
[Method of Manufacturing Hermetic Compressor 100]
Next, a method of manufacturing a main part of the hermetic compressor will be
10 described.
[0048]
Fig. 6 is a flowchart of manufacturing steps of the hermetic compressor according
to Embodiment 1. It is preferable that the projection container 50 be attached to the
hermetic container 10 in the following order. To attach the projection container 50 to
15 the hermetic container 10, first, a joining step of joining the one end portion 50a of the
cylindrical portion 51 of the projection container 50 to the middle container 10a of the
hermetic container 10 is carried out (step S1). The resistance welding described
above is used in the joining step (step S1).
[0049]
20 Next, a cylinder fixing step of fixing the cylinder 31 in the middle container 10a of
the hermetic container 10 is carried out (step S2). The hermetic compressor 100 as
illustrated in Fig. 1 includes a plurality of compression mechanisms. Thus, in the
cylinder fixing step, a single body that is obtained by combining the upper bearing 38,
the two cylinders 31, the partition plate 37, the lower bearing 39, and the rotating shaft
25 32 provided with the two rolling pistons 33 is inserted into the hermetic container 10,
and the two cylinders 31 are fixed to an inner peripheral surface of the middle container
10a. Each of the cylinders 31 is fixed to the middle container 10a at a position where
the insertion hole 31g faces the through hole 10d of the hermetic container 10.
[0050]
20
Subsequently, a vane setting step of setting the vane 35 in the vane groove 31e
of the cylinder 31 from the other end portion 50b of the cylindrical portion 51 of the
projection container 50 is carried out (step S3). Then, a spring-guide fixing step of
inserting the spring guide 40 from the other end portion 50b of the cylindrical portion 51
and fixing the spring guide 40 to the cylinder 31 is carried out (step S4). 5 Next, a spring
attaching step of inserting the spring 36 into the spring guide 40, attaching the insertion
distal end of the spring 36 to the rear end portion 35b of the vane 35, and fixing the
other end portion 36b to the bottom cover 40c of the spring guide 40 is carried out (step
S5). Finally, a sealing step of joining the projection container cover 52 to the other end
10 portion 50b of the cylindrical portion 51 and sealing the cylindrical portion 51 is carried
out (step S6).
[0051]
When the steps S1 to S6 are carried out, the process of attaching the projection
container 50 to the hermetic container 10 is completed, and the projection container 50
15 is sealed.
[0052]
In the above manufacturing method, the projection container 50 is joined to the
hermetic container 10 in the first step. Thus, it is possible to prevent thermal strain of
the spring guide 40 and the spring 36. That is, if the step of joining the projection
20 container 50 to the hermetic container 10 is carried out after the spring guide 40 and the
spring 36 are incorporated in the hermetic container 10, heat generated in the joining
step may be transferred to the spring guide 40 and the spring 36. By contrast, in
Embodiment 1, the step of joining the projection container 50 to the hermetic container
10 is carried out before the spring guide 40 and the spring 36 are incorporated in the
25 hermetic container 10, whereby it is possible to prevent thermal strain of the spring
guide 40 and the spring 36.
[0053]
In the sealing step (step S6), for example, the cylindrical portion 51 and the
projection container cover 52 are joined together by resistance welding or fusion
30 welding on the condition that the cylindrical portion 51 and the projection container
21
cover 52 are made of iron material. Alternatively, in the sealing step (step S6), for
example, the cylindrical portion 51 and the projection container cover 52 can also be
joined by brazing such as high-frequency induction brazing by which joining is
performed with low-heat input, on the condition that the projection container cover 52 is
made of copper material or ion material plated 5 with copper.
[0054]
Fig. 7 is a schematic sectional view of a modification of the projection container of
the hermetic compressor according to Embodiment 1.
The cylindrical portion 51 may be a single component as illustrated in Figs. 1 to 5
10 or, for example, may include two components, that is, a front cylindrical portion 51a and
a rear cylindrical portion 51b, which are separated at central part of the cylindrical
portion 51 and arranged in the direction along the axis 53, as illustrated in Fig. 7. The
front cylindrical portion 51a and the rear cylindrical portion 51b are cylindrical
components that accommodate the spring guide 40 therein.
15 [0055]
One end portion 51aa of the front cylindrical portion 51a is joined to the middle
container 10a of the hermetic container 10. One end portion 51ba of the rear
cylindrical portion 51b is joined to the other end portion 51ab of the front cylindrical
portion 51a. The front cylindrical portion 51a has a tapered shape in which the
20 thickness of the front cylindrical portion 51a decreases toward the one end portion
51aa. The one end portion 51ba of the rear cylindrical portion 51b is joined to the
other end portion 51ab of the front cylindrical portion 51a. The projection container
cover 52 is joined to the other end portion 51bb of the rear cylindrical portion 51b. The
projection container 50 in the modification is sealed since the other end portion 51bb of
25 the rear cylindrical portion 51b is closed by the projection container cover 52.
[0056]
In the case where the cylindrical portion 51 is divided into the front cylindrical
portion 51a and the rear cylindrical portion 51b as described above, the front cylindrical
portion 51a and the rear cylindrical portion 51b can be made of different materials. In
22
addition, it is possible to improve the workability by applying the following manufacturing
method.
[0057]
The flow of attachment of the projection container 50 as illustrated in Fig. 7 to the
hermetic container 10 is similar to that indicated in Fig. 6. Since the cylindrical 5 portion
51 is divided into the front cylindrical portion 51a and the rear cylindrical portion 51b, in
the joining step (step S1), first, the front cylindrical portion 51a and the hermetic
container 10 are joined to each other. The front cylindrical portion 51a is made of iron
material as well as the hermetic container 10. As a result, the hermetic container 10
10 and the front cylindrical portion 51a of the projection container 50 can be joined by
resistance welding. It should be noted that in this case, the cylindrical portion 51 is
divided into the two components, and of the two components, only the front cylindrical
portion 51a is joined to the middle container 10a of the hermetic container 10. Thus,
the front cylindrical portion 51a has a smaller length in the direction along the axis 53
15 than in the case where the cylindrical portion 51 is not divided. Therefore, it is easier
for an operator to perform the joining operation.
[0058]
Then, the cylinder fixing step (step S2), the spring-guide fixing step (step S4), and
the spring attaching step (step S5) are carried out. Also, in each of these steps, since
20 the front cylindrical portion 51a has a smaller length in the direction along the axis 53
than that in the case where the cylindrical portion 51 is not divided, it is easier for the
operator to perform the operation. Subsequently, the rear cylindrical portion 51b is
joined to the front cylindrical portion 51a, and the sealing step (step S6) is then carried
out.
25 [0059]
In the sealing step (step S6), the rear cylindrical portion 51b and the projection
container cover 52 can be joined by brazing under the condition in which the rear
cylindrical portion 51b and the projection container cover 52 of the projection container
50 are made of copper material. As examples of a brazing method of joining the rear
30 cylindrical portion 51b and the projection container cover 52, for example, high23
frequency induction brazing and gas brazing are present. In addition, in the case
where both the rear cylindrical portion 51b and the projection container cover 52 are
made of iron material, the rear cylindrical portion 51b and the projection container cover
52 can be joined by resistance welding or fusion welding. When one or both of the
rear cylindrical portion 51b and the projection container cover 52 5 are made of iron
material plated with copper, the projection container 50 can have a greater strength than
in the case where both the rear cylindrical portion 51b and the projection container
cover 52 are made of copper material.
[0060]
10 In the above case, after joining the front cylindrical portion 51a of the projection
container 50 to the hermetic container 10 and ending the spring attaching step (step
S5), the rear cylindrical portion 51b is joined to the front cylindrical portion 51a.
However, the following process order may be applied: the cylindrical portion 51 is
formed by joining the rear cylindrical portion 51b to the front cylindrical portion 51a, and
15 the front cylindrical portion 51a is then joined to the hermetic container 10. In the case
where the front cylindrical portion 51a is made of iron material and the rear cylindrical
portion 51b is made of copper material, the front cylindrical portion 51a and the rear
cylindrical portion 51b are joined by, for example, furnace brazing, whereby the
cylindrical portion 51 can be formed.
20 [0061]
[Operation of Hermetic Compressor 100]
Next, the operation of the hermetic compressor 100 will be described with
reference to Figs. 1 and 2. In the hermetic compressor 100, when the rotating shaft 32
is rotated by driving of the motor mechanism module 20, the rolling piston 33 in each
25 cylinder 31 is also rotated along with the rotating shaft 32. The rolling piston 33 is
eccentrically rotated in the cylinder chamber 31d. The vane 35 is reciprocated by
rotation of the rolling piston 33, since the distal end portion 35a of the vane 35 is in
contact with the rolling piston 33. At this time, gas refrigerant enters the cylinder
chamber 31d from the suction hole 34 of the compression mechanism module 30 via
30 the suction pipe 11. Then, the gas refrigerant in the cylinder chamber 31d is further
24
compressed as the volume of the compression chamber 31d2 is decreased by rotation
of the rolling piston 33.
[0062]
In this compression step, the distal end portion 35a of the vane 35 is in contact
with the outer peripheral wall 33a of the rolling piston 33 by an urging force 5 of the spring
36. In conjunction with eccentric rotation of the rolling piston 33, the vane 35 is
reciprocated in the vane groove 31e. At this time, the spring 36 is expanded and
contracted along the inner wall of the spring guide 40, and the inner wall of the spring
guide 40 guides the spring 36 in the direction in which the spring 36 is expanded or
10 contracted.
[0063]
The gas refrigerant compressed in the compression chamber 31d2 is discharged
into an internal space of the hermetic container 10 through a discharge opening (not
illustrated) provided in the upper bearing 38. The gas refrigerant that circulates in the
15 inner space of the hermetic container 10 passes through a gas hole (not illustrated)
provided in the rotor 22 and the space between the stator 21 and the rotor 22, reaches
an upper region in the hermetic container 10, and is discharged into a refrigerant circuit
located outside the hermetic container 10 through the discharge pipe 12.
[0064]
20 As described above, the hermetic compressor 100 of Embodiment 1 includes: the
hermetic container 10; the cylinders 31, each of which is hollow and accommodated in
the hermetic container 10; the rolling pistons 33, each of which is eccentrically rotated
along the inner peripheral wall 31b of an associated one of the cylinders 31; the vanes
35, each of which is reciprocated in the radial direction of the associated cylinder 31 in
25 the vane groove 31e provided in the cylinder 31; and the springs 36, each of which
urges an associated one of the vanes 35 toward a side where an associated one of the
rolling pistons 33 is provided. The hermetic compressor 100 further includes: the
projection container 50, which is projected from the hermetic container 10 toward a
location opposite to the cylinder 31 in the radial direction of the cylinder 31, which has
30 the one end portion 40a joined to the hermetic container 10, which communicates with
25
the inside of the hermetic container 10, and which defines the hermetic space 50e; and
the spring guide 40, which is provided in the hermetic space 50e of the projection
container 50 and in which the spring 36 is fixed. The insertion hole 31g is formed in
the outer peripheral wall 31f of the cylinder 31. The one end portion 40a of the spring
guide 40 is inserted into the insertion hole 31g of the cylinder 31, 5 whereby the spring
guide 40 is fixed.
[0065]
In such a manner, the spring guide 40 is additionally provided in the projection
container 50, and directly fixed to the cylinder 31. As a result, it is possible to ensure
10 that the spring 36 and the vane 35 are accurately provided in their proper positions at
which their proper positional relationship is established, as compared with the spring 36
is accommodated in the projection container 50 joined to the hermetic container 10.
Furthermore, since the spring guide 40 is directly fixed to the cylinder 31, only the spring
guide 40 is a component required for incorporation of the spring 36 in the cylinder 31.
15 In this regard also, it is possible to ensure that the spring 36 and the vane 35 are
accurately provided at their proper positions at which their proper positional relationship
is established. In addition, since the spring 36 is accommodated in the projection
container 50, the space for provision of the spring 36 is increased by the space in the
projection container 50. It is therefore possible to ensure a sufficient space for
20 expansion and contraction of the spring 36, as compared with the case where the
projection container 50 is not provided.
[0066]
The hermetic compressor 100 of Embodiment 1 includes the cylinders 31, to
which the respective spring guides 40 are fixed. The projection container 50
25 accommodates the spring guides 40.
[0067]
In such a manner, since the projection container 50 accommodates the spring
guides 40 together, it is possible to simplify the manufacturing steps of the hermetic
compressor 100, as compared with a configuration in which the spring guides 40 are
30 accommodated in respective projection containers 50. To be more specific, in the
26
configuration in which the spring guides 40 are accommodated in respective projection
containers 50, it is necessary to carry out a joining step (step S1) of joining each of the
projection containers 50, in which an associated one of the spring guides 40 is to be
accommodated, to the hermetic container 10; that is, it is necessary to carry out the
joining step a number of times that is equal to the number of the spring 5 guides 40. By
contrast, in the case where the single projection container 50 accommodates the spring
guides 40, it suffices to carry out the joining step (step S1) once.
[0068]
The one end portion 50a of the projection container 50 has a tapered shape in
10 which the thickness of the one end portion 50a decreases toward the hermetic container
10. Alternatively, the hermetic container 10 has the through hole 10d, to which the one
end portion 50a of the projection container 50 is joined, and as viewed in the axial
direction of the projection container 50, part of the end face 50aa of the one end portion
50a of the projection container 50 is located inside the through hole 10d of the hermetic
15 container 10, and the end face 50aa of the one end portion 50a of the projection
container 50 is not entirely in contact with the hermetic container 10.
[0069]
By virtue of the above configuration, it is possible to reduce the contact width by
which the hermetic container 10 and the one end portion 50a of the projection container
20 50 is brought into contact with each other when being joined to each other, and thus
facilitate joining thereof by resistance welding.
[0070]
The hermetic container 10 includes the collar 10e that is formed by curving the
part of the hermetic container 10 around the through hole 10d to which the one end
25 portion 50a of the projection container 50 is joined, such that the above part is projected
from the hermetic container 10 toward a location opposite to the cylinder 31 in the radial
direction of the cylinder 31. The projection container 50 is joined to one or both of the
inner peripheral surface 10ea of the collar 10e and the inner wall surface 10aa of the
hermetic container 10.
30 [0071]
27
By virtue of the above configuration, it is possible to ensure a sufficient contact
distance between the collar 10e and the one end portion 50a of the projection container
50 and satisfactorily join the collar 10e and the one end portion 50a by brazing or fusion
welding.
5 [0072]
The projection container 50 includes the cylindrical portion 51 and the projection
container cover 52. The cylindrical portion 51 has a cylindrical shape and has the one
end portion 50a joined to the hermetic container 10. The projection container cover 52
closes the other end portion 50b of the cylindrical portion 51.
10 [0073]
In such a manner, the projection container 50 is formed to include the cylindrical
portion 51 and the projection container cover 52 that closes the other end portion 50b of
the cylindrical portion 51, thereby providing the hermetic space 50e.
[0074]
15 The cylindrical portion 51 of the projection container 50 includes the two
components that are separated and arranged in the axial direction of the cylindrical
portion 51.
[0075]
In such a manner, the cylindrical portion 51 is formed to include the separated
20 components and thus has a smaller length in the direction along the axis 53.
Therefore, at the manufacturing time, in each of the joining step (step S1), the cylinder
fixing step (step S2), the spring-guide fixing step (step S4), and the spring attaching
step (step S5), it is easier for the operator to perform the operation.
[0076]
25 The method of manufacturing the hermetic compressor 100 includes a joining
step of joining the one end portion 50a of the cylindrical portion 51to the through hole
10d of the hermetic container 10 such that the cylindrical portion 51 is projected from
the hermetic container 10, and a cylinder fixing step of fixing the cylinder 31, which is
hollow and in which the rolling piston 33 is accommodated, in the hermetic container 10.
30 The manufacturing method of the hermetic compressor 100 further includes a vane
28
providing step of providing the vane 35 in the vane groove 31e formed in the cylinder
31, and a spring-guide fixing step of inserting the spring guide 40, which has a
cylindrical shape, from the other end portion 50b of the cylindrical portion 51 into the
cylindrical portion 51, thereby fixing the spring guide 40 to the cylinder 31. The
manufacturing method of the hermetic compressor 100 further 5 includes a spring
attaching step of inserting the spring 36, which urges the vane 35 toward a side where
the rolling piston 33 is provided, into the spring guide 40, of bringing the one end portion
36a of the spring 36 into contact with the vane 35, and of fixing the other end portion
36b of the spring 36 to the spring guide 40, and a sealing step of joining the projection
10 container cover 52 to the other end portion 50b of the cylindrical portion 51, thereby
sealing the cylindrical portion 51.
[0077]
In such a manner, the projection container 50 is joined to the hermetic container
10 before the spring guide 40 and the spring 36 are incorporated in the hermetic
15 container 10. As a result, it is possible to prevent thermal strain of the spring guide 40
and the spring 36 and seal the projection container 50.
[0078]
In the manufacturing method of the hermetic compressor 100, in the sealing step
(step S6), the cylindrical portion 51 and the projection container cover 52 are joined by
20 resistance welding. Alternatively, in the sealing step (step S6), the cylindrical portion
51 and the projection container cover 52 are joined by brazing. Alternatively, in the
sealing step (step S6), the cylindrical portion 51 and the projection container cover 52
are joined by fusion welding.
[0079]
25 In such a manner, the cylindrical portion 51 and the projection container cover 52
are joined by a joining method with low heat input. As a result, it is possible to prevent
thermal strain of the spring guide 40 and the spring 36 and seal the projection container
50.
[0080]
30 Embodiment 2
29
[Hermetic Compressor 110]
Fig. 8 is a schematic vertical sectional view of a hermetic compressor according
to Embodiment 2. In the figure, components that have the same configurations as
those of the hermetic compressor 100 as illustrated in Figs. 1 to 7 are denoted by the
same reference signs. Regarding the hermetic compressor 5 110 according to
Embodiment 2, matters that will not be particularly described are similar to those
regarding the hermetic compressor 100 according to Embodiment 1, and the same
functions and configurations as in the hermetic compressor 100 according to
Embodiment 1 will be described using the same reference signs.
10 [0081]
In the hermetic compressor 100 according to Embodiment 1 as described above,
the number of projection containers 50 is one regardless of the number of the cylinders
31 provided in the hermetic container 10. On the other hand, in the hermetic
compressor 110 according to Embodiment 2, the number of the projection containers 50
15 varies depending on the number of the cylinders 31 provided in the hermetic container
10. That is, the hermetic compressor 110 includes the projection containers 50 the
number of which is equal to the number of the cylinders 31.
[0082]
Each of the projection containers 50 accommodates an associated one of the
20 spring guides 40. For example, as illustrated in Fig. 8, in the hermetic compressor 110
of Embodiment 2, the number of the cylinders 31 provided in the hermetic container 10
is two. In this case, the number of the projection containers 50 joined to the middle
container 10a is also two. The spring guide 40 fixed to the upper cylinder 31A is
accommodated in one of the two projection containers 50, and the spring guide 40 fixed
25 to the lower cylinder 31B is accommodated in the other of the two projection containers
50.
[0083]
Two through holes 10d1 and 10d2 are formed in the middle container 10a of the
hermetic container 10 in association with the two spring guides 40. As in Embodiment
30 1, the one end portion 40a of each of the spring guides 40 is press-fitted into and fixed
30
to the outer peripheral insertion hole 31g2 of the insertion hole 31g of an associated one
of the cylinders 31 through an associated one of the through holes 10d1 and 10d2.
Each of the projection containers 50 is joined to an associated one of the through holes
10d1 and 10d2 of the middle container 10a of the hermetic container 10 by, for
example, resistance welding, brazing, or fusion welding as in Embodiment 5 1, thereby
forming a hermetic space 50e.
[0084]
As described above, the hermetic compressor 110 includes the plurality of
cylinders 31, and the plurality of spring guides 40 are fixed to the respective cylinders
10 31. Furthermore, the hermetic compressor 110 includes the plurality of projection
containers 50 the number of which is equal to the number of the plurality of cylinders 31
and which accommodate the respective spring guides 40.
[0085]
By virtue of the above configuration, for example, even in the case where relative
15 positions of the spring guides 40 fixed to the respective cylinders 31 to the cylinders 31
in the circumferential direction are different, the spring guides 40 can provide respective
hermetic spaces 50e.
[0086]
Embodiments to be described in the present disclosure are not limited to
20 Embodiments 1 and 2 described above, and Embodiments 1 and 2 can be variously
modified as below.
[0087]
For example, in the above description, the hermetic compressor 100 is a twin
rotary compressor including two cylinders 31. However, the hermetic compressor 100
25 may be a single rotary compressor including a single cylinder 31.
[0088]
In addition, the sectional shape of the insertion hole 31g formed in the cylinder 31
is not limited to a circular shape and may be, for example, an insertion shape, an
elliptical shape, or a polygonal shape. In the case where the sectional shape of the
30 insertion hole 31g is an insertion shape, an elliptical shape, or a polygonal shape, the
31
spring guide 40 is formed to have a sectional shape that is determined depending on
the sectional shape of the insertion hole 31g; that is, the spring guide 40 is formed into
an oval shape, an elliptical shape, or a polygonal shape.
[0089]
5 Embodiment 3
Fig. 9 is a diagram illustrating a refrigerant circuit of a refrigeration cycle
apparatus according to Embodiment 3.
A refrigeration cycle apparatus 60 includes a hermetic compressor 61, a
condenser 62, an ページ : 31
10 expansion valve 63, which serves as a pressure reducing device, and an evaporator 64.
The hermetic compressor 61 is the hermetic compressor 100 of Embodiment 1 or the
hermetic compressor 110 of Embodiment 2. Gas refrigerant discharged from the
hermetic compressor 61 flows into the condenser 62 and exchanges heat with air that
passes through the condenser 62 to change into high-pressure liquid refrigerant, and
15 the high-pressure liquid refrigerant flows out of the condenser 62. The high-pressure
liquid refrigerant that has flowed out of the condenser 62 is decompressed by the
expansion valve 63 to change into low-pressure two-phase gas-liquid refrigerant, and
the low-pressure two-phase gas-liquid refrigerant flows into the evaporator 64. The
low-pressure two-phase gas-liquid refrigerant that has flowed into the evaporator 64
20 exchanges heat with air that passes through the evaporator 64 to change into lowpressure
gas refrigerant, and the low-pressure gas refrigerant is re-sucked into the
hermetic compressor 61.
[0090]
The refrigeration cycle apparatus 60 having the above configuration includes the
25 hermetic compressor 100 of Embodiment 1 or the hermetic compressor 110 of
Embodiment 2 as the hermetic compressor 61. Thus, in the refrigeration cycle
apparatus 60, the vane 35 and the spring 36 can be stably operated. As a result, the
refrigeration cycle apparatus 60 has high reliability.
[0091]
30 The refrigeration cycle apparatus 60 is applicable to, for example, an air32
conditioning apparatus, a refrigerator, or a refrigerating machine.
Reference Signs List
[0092]
10: hermetic container, 10a: middle container, 10aa: inner wall surface, 10b:
upper container, 10c: lower container, 10d: through hole, 10d1: through 5 hole, 10d2:
through hole, 10e: collar, 10ea: inner peripheral surface, 11: suction pipe, 11A: suction
pipe, 11B: suction pipe, 12: discharge pipe, 13: accumulator, 14: base, 20: motor
mechanism module, 21: stator, 22: rotor, 30: compression mechanism module, 31:
cylinder, 31A: upper cylinder, 31B: lower cylinder, 31b: inner peripheral wall, 31d:
10 cylinder chamber, 31d1: suction chamber, 31d2: compression chamber, 31e: vane
groove, 31f: outer peripheral wall, 31g: insertion hole, 31g1: inner peripheral insertion
hole, 31g2: outer peripheral insertion hole, 31h: seal pipe, 32: rotating shaft, 32a:
eccentric portion, 33: rolling piston, 33a: outer peripheral wall, 34: suction hole, 34B:
discharge hole, 35: vane, 35a: distal end portion, 35b: rear end portion, 36: spring, 36a:
15 one end portion, 36b: other end portion, 37: partition plate, 38: upper bearing, 39: lower
bearing, 40: spring guide, 40a: one end portion, 40b: other end portion, 40c: bottom
cover, 50: projection container, 50a: one end portion, 50aa: end face, 50b: other end
portion, 50e: hermetic space, 51: cylindrical portion, 51a: front cylindrical portion, 51aa:
one end portion, 51ab: other end portion, 51b: rear cylindrical portion, 51ba: one end
20 portion, 51bb: other end portion, 52: projection container cover, 53: axis, 60:
refrigeration cycle apparatus, 61: hermetic compressor, 62: condenser, 63: expansion
valve, 64: evaporator, 100: hermetic compressor, 110: hermetic compressor, C: central
axis
We Claim :
[Claim 1]
A hermetic compressor comprising:
a hermetic container;
a hollow cylinder that is accommodated in the hermetic 5 container;
a rolling piston configured to eccentrically rotate along an inner peripheral wall of
the cylinder;
a vane configured to reciprocate in a radial direction of the cylinder in a vane
groove provided in the cylinder;
a spring configured to urge the vane toward a side where the rolling piston is
provided;
a projection container provided at the hermetic container such that the projection
container is projected from the hermetic container toward a location opposite to the
cylinder in the radial direction of the cylinder, the projection container having one end
portion joined to the hermetic container, and the projection container communicating
with an inside of the hermetic container, and defining a hermetic space; and
a spring guide in which the spring is fixed, the spring guide being provided in the
hermetic space of the projection container,
wherein an insertion hole is formed in an outer peripheral wall of the cylinder, and
the spring guide has a one end portion inserted in the insertion hole of the
cylinder, whereby the spring guide is fixed.
[Claim 2]
The hermetic compressor of claim 1, comprising a plurality of cylinders each of
which is identical to the cylinder, and to which respective spring guides are fixed, the
spring guides being each identical to the spring guide,
wherein the projection container accommodates the plurality of spring guides
together.
[Claim 3]
The hermetic compressor of claim 1, comprising:
a plurality of cylinders each of which is identical to the cylinder, and to which
respective spring guides are fixed, the spring guides being each identical to the spring
guide; and
a plurality of projection containers each of which is identical to the projection
container and the number of which is equal to the number of 5 the cylinders, the
projection containers each accommodating an associated one of the spring guide.
[Claim 4]
The hermetic compressor of any one of claims 1 to 3, wherein the one end
portion of the projection container has a tapered shape in which a thickness of the one
end portion of the projection container decreases toward the hermetic container.
[Claim 5]
The hermetic compressor of any one of claims 1 to 3, wherein
the hermetic container has a through hole to which the one end portion of the
projection container is joined, and
an end face of the one end portion of the projection container is partially located
inside the through hole of the hermetic container as viewed in an axial direction of the
projection container, and is not entirely in contact with the hermetic container.
[Claim 6]
The hermetic compressor of any one of claims 1 to 3, wherein
20 the hermetic container includes a collar, and part of the hermetic container that is
located around a through hole to which the one end portion of the projection container is
joined is curved such that the part is projected from the hermetic container toward the
location opposite to the cylinder in the radial direction of the cylinder, thereby forming
the collar, and
the projection container is joined to one or both of an inner peripheral surface of
the collar and an inner wall surface of the hermetic container.
[Claim 7]
The hermetic compressor of any one of claims 1 to 6, wherein
the projection container includes
a cylindrical portion that has a cylindrical shape and has one end portion
joined to the hermetic container, and
a projection container cover that closes an other end portion of the
cylindrical portion.
[Claim 8]
The hermetic compressor of claim 7, wherein the cylindrical portion of the
projection container includes two components that are separated and arranged in an
axial direction of the cylindrical portion.
[Claim 9]
A refrigeration cycle apparatus comprising the hermetic compressor of any one of
claims 1 to 8.
[Claim 10]
A method of manufacturing a hermetic compressor, comprising:
joining one end portion of a cylindrical portion to a through hole of the hermetic
container, the cylindrical portion being formed to project from the hermetic container and
having open ends;
fixing in the hermetic container, a hollow cylinder in which a rolling piston is
accommodated;
providing a vane in a vane groove formed in the cylinder;
inserting a spring guide having a cylindrical shape from an other end portion of
the cylindrical portion into the cylindrical portion, and fixing the spring guide to the
cylinder;
inserting into the spring guide, a spring configured to urge the vane toward a side
where the rolling piston is provided, bringing one end portion of the spring into contact
with the vane, and fixing an other end portion of the spring to the spring guide; and
sealing the cylindrical portion by joining a projection container cover to the other
end portion of the cylindrical portion.
[Claim 11]
The method of manufacturing a hermetic compressor of claim 10, wherein in the
sealing the cylindrical portion, the cylindrical portion and the projection container cover
are joined by resistance welding.
[Claim 12]
The method of manufacturing a hermetic compressor of claim 5 10, wherein in the
sealing the cylindrical portion, the cylindrical portion and the projection container cover
are joined by brazing.
[Claim 13]
The method of manufacturing a hermetic compressor of claim 10, wherein in the
sealing the cylindrical portion, the cylindrical portion and the projection container cover
are joined by fusion welding.