FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
HERMETIC COMPRESSOR AND MANUFACTURING METHOD FOR 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 1008310, JAPAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION
AND THE MANNER IN WHICH IT IS TO BE PERFORMED

DESCRIPTION
Technical Field
[0001]
The present disclosure relates to a hermetic compressor used in a refrigeration
cycle such as an air-conditioning apparatus, a refrigerator, and 5 a freezer, and a
manufacturing method for a hermetic compressor.
Background Art
[0002]
A related-art hermetic compressor includes a rotary compressor that
compresses a refrigerant by combining a rotating piston and a cylinder. In this rotary
compressor, a piston is housed in a cylinder, and a vane urged by a spring contacts
the piston to form a compression chamber in the cylinder. The spring that urges the
vane is housed in a spring insertion hole formed in the cylinder, and the spring is held
by the cylinder. However, in the configuration in which the spring is held by the
cylinder, the distance between the back surface of the vane and the sealed container
is small. Therefore, when the vane reaches the top dead center of the reciprocating
motion, the total length of the spring reaches almost the contact length of the spring,
the stress generated in the spring increases, and the spring may be damaged by
fatigue. Therefore, in order to reduce the stress generated in the spring, a hermetic
compressor has been proposed in which a protruding container is provided in the
sealed container so that the spring attaching interval is increased (for example, Patent
Literature 1). In recent years, the stroke volume of a hermetic compressors has
expanded, and the expansion and contraction allowance of the spring that slides the
vane is limited. Therefore, it has become increasingly important to secure the
expansion and contraction allowance of the spring that slides the vane.
Citation List
Patent Literature
[0003]
Patent Literature 1: Japanese Unexamined Patent Application Publication No.
30S63-16189

Summary of Invention
Technical Problem
[0004]
The hermetic compressor of Patent Literature 1 has a configuration in which a
protruding container protruding from a sealed container is provided 5 and a spring is
arranged in the protruding container. However, in the hermetic compressor of Patent
Literature 1, if the sealed container and the cylinder are assembled not accurately, the
positional relationship between the spring and the vane may be misaligned, and, for
example, the spring may be twisted when the spring expands and contracts, whereby
a possibility arises that the spring will not expand and contract as designed.
[0005]
The present disclosure has been made in order to solve the problem
mentioned above. An objective thereof is to obtain a hermetic compressor that
ensures the accuracy of positional relationship between the spring and the vane while
ensuring allowance for the expansion and contraction of the spring for sliding the
vane used in the hermetic compressor, and a manufacturing method for a hermetic
compressor.
Solution to Problem
[0006]
A hermetic compressor according to one embodiment of the present disclosure
includes a sealed container, at least one cylinder that is hollow and is accommodated
in the sealed container, a rolling piston configured to rotate eccentrically along an
inner peripheral wall of the cylinder, a vane that contacts an outer peripheral wall of
the rolling piston and divides a space in the cylinder into a suction chamber and a
compression chamber, a spring configured to urge the vane towards an arrangement
side of the rolling piston, at least one cylindrical spring guide that protrudes from the
sealed container, forms a hollow section that accommodates the spring, and defines
an expansion and contraction direction of the spring, and a protruding container that
protrudes from the sealed container, forms a sealed space together with the sealed
container, and accommodates the spring guide, in which the cylinder has an insertion
hole into which the spring is inserted, one end section of the spring guide is fixed to
the cylinder, the hollow section is in communication with the insertion hole, and an
other end section of the spring guide is closed by a bottom lid section, and the spring
is arranged between a back side end section of the vane that is located on a side
opposite to the rolling piston and the bottom 5 lid section.
Advantageous Effects of Invention
[0007]
The hermetic compressor according to the embodiment of the present
disclosure includes the cylindrical spring guide that protrudes from the sealed
container, forms the hollow section that accommodates the spring, and defines the
expansion and contraction direction of the spring. The one end section of this spring
guide is fixed to the cylinder, the hollow section is in communication with the insertion
hole formed in the cylinder, and the other end section of the spring guide is closed by
the bottom lid section. Then, the spring is arranged between the back side end
section of the vane that is located on a side opposite to the rolling piston and the
bottom lid section. For this reason, since the spring is arranged between the back
side end section of the vane and the bottom lid section of the spring guide that
protrudes from the sealed container, the hermetic compressor can secure a larger
expansion and contraction allowance as compared with a case where the spring is
arranged between the back side end section of the vane and the sealed container.
In addition, when the spring guide is directly fixed to the cylinder, only the spring
guide holds the spring against the cylinder, and the hermetic compressor can secure
a positional precision between the spring and the vane.
Brief Description of Drawings
[0008]
[Fig. 1] Fig. 1 is a vertical cross sectional view of a hermetic compressor
according to Embodiment 1 of the present disclosure.
[Fig. 2] Fig. 2 is a schematic cross sectional view of an upper cylinder in a
compression mechanical section of Fig. 1 taken along a line A-A.
[Fig. 3] Fig. 3 is a flow chart illustrating a manufacturing step for the hermetic
compressor of Fig. 1.
[Fig. 4] Fig. 4 is a schematic cross sectional view of a modification example of
a protruding container illustrated in Fig. 2.
[Fig. 5] Fig. 5 is a vertical cross sectional view of a hermetic compressor
according to Embodiment 2 of the present 5 disclosure.
Description of Embodiments
[0009]
Hereinafter, the hermetic compressor 100 and the hermetic compressor 110
according to the embodiment of the present disclosure will be described with
reference to the drawings or the like. In the following drawings including Fig. 1, the
relative dimensional relationship and the shape of each component may be different
from the actual ones. Further, in the following drawings, the components denoted by
the same reference numerals are the same or equivalent, and this is common
throughout the entire text of the specification. In addition, to facilitate understanding,
terms (for example, “up”, “down”, “right”, “left”, “front”, “back”, etc.) are used as
appropriate for the sake of convenience of explanation. The arrangement and
orientation of the device or parts are, however, not limited to such description.
[0010]
Embodiment 1
[Hermetic compressor 100]
Fig. 1 is a longitudinal sectional view of a hermetic compressor 100 according
to Embodiment 1 of the present disclosure. The sealed compressor 100 is one of
components that form a refrigeration cycle used in, for example, an air-conditioning
apparatus, a refrigerator, a freezer, a vending machine, a water heater, etc. The
hermetic compressor 100 is a twin-rotary compressor that forms two compression
chambers. A hermetic compressor 100 includes a sealed container 10, an electric
operation mechanical section 20 and the compression mechanical section 30
accommodated inside the sealed container 10. The hermetic compressor 100 has
an accumulator 13 outside the hermetic container 10, and a suction pipe 11
connecting the sealed container 10 and the accumulator 13. Furthermore, the

hermetic compressor 100 has a protruding container 50 that accommodates a spring
configured to urge a vane 35 described later.
[0011]
The sealed container 10 defines the outer contour of the hermetic compressor
100. The sealed container 10 is formed of a substantially 5 cylindrical middle
container 10a, an upper container 10b that closes the upper opening port of the
middle container 10a, and a lower container 10c that closes the lower opening port of
the middle container 10a. In the sealed container 10, the upper container 10b is
engaged with the upper opening port of the middle container 10a, and the lower
container 10c is engaged with the lower opening port of the middle container 10a, to
thereby maintain the sealed condition. The suction pipe 11 with the accumulator 13
being attached thereto is connected to the middle container 10a, and a discharge pipe
12 is connected to the upper container 10b. The suction pipe 11 is a connecting pipe
configured to feed the gas refrigerant (low temperature and low pressure) through the
accumulator 13 into the compression mechanical section 30. A discharge pipe 12 is
a connecting pipe configured to feed the gas refrigerant (high temperature and high
pressure) in the sealed container 10 that has been compressed by the compression
mechanical section 30 to the outside of the sealed container 10. The sealed
container 10 is disposed on a pedestal 14, and the lower container 10c is fixed to the
pedestal 14. In the hermetic compressor 100, the pedestal 14 is fixed to the
installation site by bolts or the like in the normal installation condition.
[0012]
(Electric operation mechanical section 20)
The electric operation mechanical section 20 generates a rotary motion that
rotates the rotary shaft 32 inside the sealed container 10. The electric operation
mechanical section 20 is arranged above the compression mechanical section 30 in
the sealed container 10. The electric operation mechanical section 20 includes a
stator 21 fixed to the inner peripheral wall of the middle container 10a and a rotor 22
rotatably fitted to the inner peripheral side of the stator 21. The stator 21 is fixed to the middle container 10a of the sealed container 10 by various fixing methods such as
shrink fitting and welding. A rotating shaft 32 extending downward is fixed to the
center of the rotor 22. The stator 21 rotates the rotor 22 with electric power supplied
from the outside of the hermetic compressor 100.
[0013]
(Compression mechanical 5 section 30)
The compression mechanical section 30 is accommodated in the sealed
container 10 and compresses refrigerant flowing into the sealed container 10. The
compression mechanical section 30 is disposed below the electric operation
mechanical section 20, and is fixed to the middle container 10a. The compression
mechanical section 30 includes a cylinder 31 having a substantially cylindrical shape.
The compression mechanical section 30 further includes the rotary shaft 32, rolling
pistons 33, the vanes 35, the springs 36, an upper bearing 38, a lower bearing 39, a
partition plate 37, spring guides 40, and the protruding container 50.
[0014]
The hermetic compressor 100 includes at least one cylinder 31 that is hollow
and is accommodated in the sealed container 10 in the compression mechanical
section 30. As illustrated in Fig. 1, the hermetic compressor 100 may also include a
plurality of cylinders 31. That is, as illustrated in Fig. 1, the compression mechanical
section 30 may also be formed of the plurality of cylinders 31 including an upper
cylinder 31A and a lower cylinder 31B. Note that the cylinder 31 is a collective term
for the plurality of cylinders such as the upper cylinder 31A and the lower cylinder
31B. In the sealed container 10, the upper cylinder 31A having a substantially
cylindrical shape is arranged above the lower cylinder 31B having a substantially
cylindrical shape. In an upper section of the upper cylinder 31A, the upper bearing
38 is arranged in contact with an upper end surface of the upper cylinder 31A, and
the upper bearing 38 closes the upper end surface of the upper cylinder 31A. In a
lower section of the lower cylinder 31B, the lower bearing 39 is arranged in contact
with a lower end surface of the lower cylinder 31B, and the lower bearing 39 closes
the lower end surface of the lower cylinder 31B. The partition plate 37 is arranged
between the upper cylinder 31A and the lower cylinder 31B, and closes a lower end
surface of the upper cylinder 31A and an upper end surface of the lower cylinder 31B.
[0015]
Fig. 2 is a schematic cross-sectional view of the upper cylinder 31A in the
compression mechanical section 30 in Fig. 1 taken along line A-A. However, note
that Fig. 2 represents a cross section taken along line A-A in a state 5 being rotated
counterclockwise by 90 degrees. Hereinafter, the configuration of the compression
mechanical section 30 will be further described with reference to Fig. 2 and Fig. 1. It
is noted that a relationship among the rolling piston 33, the vane 35, and the spring
36 in the upper cylinder 31A is the same as a relationship among the rolling piston 33,
the vane 35, and the spring 36 in the lower cylinder 31B. Therefore, in the following
description, rather than explaining the upper cylinder 31A and the lower cylinder 31B
separately, an explanation will be made with reference to the cylinder 31, since it is a
collective term for the upper cylinder 31A and the lower cylinder 31B. Further, in Fig.
2, illustration of the eccentric section 32a disposed in the cylinder 31 is omitted.
15 [0016]
The cylinder 31 includes, as illustrated in Fig. 2, a peripheral wall section 31b
formed in a cylindrical shape, to thereby form a cylinder chamber 31d concentric with
the rotary shaft 32 by the inner peripheral wall 31b1 of the peripheral wall section 31b.
Inside the peripheral wall section 31b, the rolling piston 33 is disposed, and the inner
peripheral wall 31b1 of the peripheral wall section 31b faces the outer peripheral wall
33a of the rolling piston 33 formed in a cylindrical shape. In the peripheral wall
section 31b of the cylinder 31, vane grooves 31e are formed in the radial direction
towards the outer peripheral wall 31f side from the inner peripheral wall 31b1. In this
vane groove 31e, the vane 35 is slidably disposed. The cylinder chamber 31d is
divided by vanes 35 into a suction chamber 31d1 communicating with the suction
hole 34 and a compression chamber 31d2 communicating with a discharge hole 34B.
That is, the cylinder 31 is formed in a cylindrical shape, and forms the cylinder
chamber 31d forming the suction chamber 31d1 and a compression chamber 31d2 in
a space surrounded by the inner peripheral wall 31b1 of the cylinder 31.
[0017]
In the peripheral wall section 31b of the cylinder 31, an insertion hole 31g into
which the spring 36 is inserted is formed along the radial direction of the cylinder 31
between the outer peripheral wall 31f of the vane groove 31e and the cylinder 31. In
the insertion hole 31g, a spring 36 configured to urge the vane 35 to the arrangement
side of the rolling piston 33 is inserted from the outer peripheral wall 5 31f side. The
insertion hole 31g has an outer peripheral side insertion hole 31g2 formed on the
outer peripheral wall 31f side of the cylinder 31, the inner peripheral wall 31b1 side of
the cylinder 31, i.e., an inner peripheral side insertion hole 31g1 formed in the vane
groove 31e side. A cross-sectional shape of each of the outer peripheral side
insertion hole 31g2 and the inner peripheral side insertion hole 31g1 is circular.
When a diameter of the outer peripheral side insertion hole 31g2 is named as φD,
and a diameter of the inner peripheral side insertion hole 31g1 is named as φd, φd is
smaller than φD (φd < φD). That is, the insertion hole 31g includes a plurality of
sections having different diameters in a central axis direction of the insertion hole 31g
from the outer peripheral wall 31f of the cylinder 31 towards the inner peripheral wall
31b1. The insertion hole 31g is shaped to have a reduced diameter as being closer
to the vane groove 31e between the outer peripheral wall 31f and the vane groove
31e. A central axis of the outer peripheral side insertion hole 31g2 and a central axis
of the inner peripheral side insertion hole 31g1 are coaxial, and both the central axes
are intersecting with a center axis C of the rotary shaft 32 extending perpendicularly
to a paper plane.
[0018]
In the peripheral wall section 31b of the cylinder 31, the suction holes 34 and
the discharge hole 34B disposed on both sides sandwiching the vane grooves 31e in
a circumferential direction is formed. The suction hole 34 of the upper cylinder 31A
is connected to the suction pipe 11A, and the suction hole 34 of the lower cylinder
31B is connected to the suction pipe 11B. Note that the suction pipe 11 described
above is a collective term for the suction pipe 11A and the suction pipe 11B. The
discharge hole 34B is formed such that it extends from the inner peripheral wall 31b1
of the cylinder 31 towards an outside in the radial direction, and communicates with
the space in the sealed container 10 through a discharge hole (not shown) formed in
the upper bearing 38.
[0019]
As illustrated in Fig. 1, the rotary shaft 32 includes, on one end section in the
axial direction, an eccentric section 32a that is eccentric in one direction 5 of the radial
direction. Another end section in the axial direction of the rotary shaft 32 is inserted
into and fixed to a central section of the rotor 22 of the electric operation mechanical
section . The rotary shaft 32 is supported by the upper bearing 38 and the lower
bearing 39 such that the rotary shaft 32 can rotate, and rotates together with the rotor 2
[0020]
As illustrated in Fig. 1 and Fig. 2, the hermetic compressor 100 includes a
rolling piston 33 that eccentrically rotates along the inner peripheral wall 31b1 of the
cylinder 31 in the compression mechanical section 30. The rolling piston 33 is
located eccentrically relative to the central axis C of the rotary shaft 32, and is
mounted on the eccentric section 32a of the rotary shaft 32 in the cylinder chamber
31d so as to rotate together with the rotary shaft 32. The rolling piston 33 is
eccentrically rotated in the cylinder chamber 31d by the rotation of the rotary shaft 32.
[0021]
As illustrated in Fig. 1 and Fig. 2, in the compression mechanical section 30,
the hermetic compressor 100 includes the vane 35 that contacts the outer peripheral
wall 33a of the rolling piston 33 and divides the space in the cylinder 31 into the
suction chamber 31d1 and the compression chamber 31d2. A distal end section 35a
of the vane 35 contacts the outer peripheral wall 33a of the rolling piston 33 by urging
force of the spring 36. The vane 35 is slidably in contact with the outer peripheral
wall 33a of the rolling piston 33.
[0022]
In the hermetic compressor 100, as illustrated in Fig. 1 and Fig. 2, the
compression mechanical section 30 includes the spring 36 configured to urge the
30 vane 35 towards the arrangement side of the rolling piston 33. As illustrated in Fig.
2, the spring 36 is arranged in a back side end section 35b of the vane 35 located on
a side opposite to the rolling piston 33 in the diameter direction of the cylinder 31. In
addition, the spring 36 is accommodated in the spring guide 40, which will be
described below. The spring 36 is slidably arranged in a hollow section 40e of the
spring guide 40. The spring 36 is a compression coil spring that uses 5 reactive force
while the spring is compressed, and is a cylindrical coil spring. The spring 36 is
preferably a cylindrical coil spring but is not limited thereto. Since the spring 36 is
guided by the spring guide 40, a spring having the same coil outside diameter in a
free length direction of the spring 36 is preferably used. For this reason, for
example, as long as the spring guide 40 has an elliptic shape in a vertical cross
section, an elliptic coil spring may also be used as the spring 36. The spring 36 has
one end section 36b in the free length direction that is fixed to a bottom lid section
40c of the spring guide 40, and another end section 36a attached to the back side
end section 35b of the vane 35. That is, the spring 36 is arranged between the back
side end section 35b of the vane 35 located on a side opposite to the rolling piston
and the bottom lid section 40c of the spring guide 40.
[0023]
As illustrated in Fig. 1 and Fig. 2, the hermetic compressor 100 includes the
cylindrical spring guide 40 that protrudes from the sealed container 10, forms the
hollow section 40e that accommodates the spring 36, and defines an expansion and
contraction direction of the spring 36 in the compression mechanical section 30. The
spring guide 40 is a cylindrical member that accommodates the spring 36. One end
section 40a of the spring guide 40 is inserted into the insertion hole 31g located in the
outer peripheral wall 31f of the cylinder 31 and fixed to the cylinder 31. In more
detail, the one end section 40a of the spring guide 40 is inserted into the outer
peripheral side insertion hole 31g2 of the insertion hole 31g and fixed to the cylinder
31. The spring guides 40 are respectively fixed to the plurality of cylinders 31
including the upper cylinder 31A and the lower cylinder 31B. An end surface of the
end section 40a of the spring guide 40 is arranged to face a step surface between the
outer peripheral side insertion hole 31g2 of the insertion hole 31g and the inner
peripheral side insertion hole 31g1. The spring guide 40 is press-fit and fixed to the
outer peripheral side insertion hole 31g2 of the cylinder 31, for example. In further
more detail, for example, a seal pipe 31h is press-fit to the outer peripheral side
insertion hole 31g2 of the cylinder 31. The seal pipe 31h is a cylindrical pipe. An
outside diameter of the seal pipe 31h is thicker than an inside diameter 5 of the outer
peripheral side insertion hole 31g2 in a state before the seal pipe 31h is press-fit to
the outer peripheral side insertion hole 31g2. In addition, the seal pipe 31h is pressfit
to the end section 40a of the spring guide 40. An outside diameter of the spring
guide 40 is thicker than an inside diameter of the seal pipe 31h in a state before the
spring guide 40 is press-fit to the seal pipe 31h. When the spring guide 40 is fixed to
the cylinder 31, the hollow section 40e of the spring guide 40 communicates with the
inner peripheral side insertion hole 31g1 of the insertion hole 31g that is located in the
cylinder 31. At this time, an inside diameter of the hollow section 40e is preferably
matched with an inside diameter of the inner peripheral side insertion hole 31g1. In
15 the spring guide 40, the bottom lid section 40c is arranged in another end section
40b, and an opening port of the hollow section 40e closer to the end section 40b is
closed by the bottom lid section 40c. The spring guide 40 is accommodated in the
protruding container 50.
[0024]
The spring guide 40 has an inner wall extending along the coil outer diameter
of the spring 36. The spring guide 40 may have, for example, an inner wall of a
circular cross-sectional shape if the spring 36 is a cylindrical coil spring and an inner
wall of an elliptical cross-sectional shape if the spring 36 is an elliptical coil spring.
The spring guide 40 regulates the movement in the radial direction of the spring 36 so
that the axial displacement of the spring 36 does not increase. Since the spring
guide 40 regulates the movement in the radial direction of the spring 36, it is desirable
that the inner diameter of the spring guide 40 be formed slightly larger than the coil
outer diameter of the spring 36. That is, it is desirable that the distance between the
inner wall of the spring guide 40 and the coil outer diameter of the spring 36 be
smaller. The spring 36 can be prevented from twisting by being guided by the inner
wall of the spring guide 40 at the time of expansion and contraction.
[0025]
Since the vane 35 disposed in the vane groove 31e slides along the inner wall
of the cylinder 31, as the number of components holding the spring 5 36 against the
cylinder 31 increases, it becomes difficult to secure location accuracy between the
spring 36 and the vane 35. By fixing the spring guide 40 directly to the cylinder 31,
only the spring guide 40 holds the spring 36 against the cylinder 31, whereby it is
possible to ensure positional accuracy between the spring 36 and the vane 35.
[0026]
As illustrated in Fig. 1, a through hole having a diameter at least as large as the
outer diameter of the spring guide 40 is formed in the middle container a of the
sealed container 10 so that the spring guide 40 and the upper cylinder 31A can be
joined. Similarly, a through hole having a diameter at least as large as the outer
diameter of the spring guide 40 is formed in the middle container 10a of the sealed
container 10 so that the spring guide 40 and the lower cylinder 31B can be joined.
Alternatively, one through hole may be formed in the middle container 10a of the
sealed container 10 so that the spring guide 40 and the upper cylinder 31A can be
joined and the spring guide 40 and the lower cylinder 31B can be joined.
[0027]
As illustrated in Fig. 1 and Fig. 2, the hermetic compressor 100 includes a
protruding container 50 that protrudes from the sealed container is joined to the
sealed container to form a sealed space together with the sealed container and
accommodates the spring guides 40 in its inside. The protruding container 50 has a
cylindrical section 51 and a protruding container lid 52. The cylindrical section 51 is
a section formed in a cylindrical shape for accommodating the spring guide 40 in a
hollow section 50e. One end portion 50a of the cylindrical section 51 of the
protruding container 50 is fixed to the middle container 10a of the sealed container
. In the cylindrical section 51 of the protruding container 50, a protruding container
cover 52 is disposed on another end section 50b. The protruding container cover 52
closes an end portion 50b located on the side of the cylindrical section 51 opposite to
the side fixed to the sealed container In the cylindrical section 51, an opening
port of the hollow section 50e of the end portion 50b is closed by the protruding
container lid 52.
[0029]
Fig. 3 is a flow chart illustrating a manufacturing step for the hermetic
compressor 100 of Fig. 1. It is preferred that the protruding container 50 be attached
to the sealed container 10 in the following order. When an attachment step of the
protruding container 50 to the sealed container 10 is started, a joining step of joining
10 the cylindrical section 51 that protrudes from the sealed container 10 and is formed
into a cylindrical shape to the middle container 10a of the sealed container 10
defining the outline is performed (step S1). Subsequently, a cylinder fixing step of
fixing the cylinder 31 that is hollow and accommodates the rolling piston 33 into the
middle container 10a of the sealed container 10 is performed (step S2). Next, a
vane arrangement step of arranging the vane 35 in the vane groove 31e formed in the
cylinder 31 is performed (step S3). Next, a spring guide fixing step of inserting the
spring guide 40 that is cylindrical and defines the expansion and contraction direction
of the spring 36 configured to urge the vane 35 towards the arrangement side of the
rolling piston 33 from the hollow section 50e of the cylindrical section 51 and fixing the
spring guide 40 to the cylinder 31 is performed (step S4). Next, a spring attachment
step of inserting the spring 36 into the spring guide 40, and causing one end of the
spring 36 to abut against the vane 35 and another end to be fixed to the bottom lid
section 40c of the spring guide 40 is performed (step S5). Finally, a closing step of
joining the end section 50b located on a side opposite to the end section 50a fixed to
the sealed container 10 of the cylindrical section 51 to the protruding container lid 52
and sealing the cylindrical section 51 (step S6). After the steps from step S1 to step
S6 are performed, the attachment step of the protruding container 50 to the sealed
container is ended. When the attachment of the protruding container 50 to the
sealed container is performed as described above, thermal strain of the spring
30 guide 40 and the spring 36 is avoided, and the protruding container 50 can be sealed.
[0030]
In the joining step (step S1), the cylindrical section 51 of the protruding
container 50 and the middle container a of the sealed container can be joined by
resistance welding by using the projecting container 50 as an iron member. In the
closing step (step S6), for example, a cylindrical section 51 which is formed of an iron
member and the protruding container cover 52 which is formed of an iron member are
joined by resistance welding. Alternatively, in the closing step S6, for example, the
protruding container lid 52 is made of a copper member or a copper-plated iron
member, so that the cylindrical section 51 and the protruding container lid 52 are
joined by brazing. The brazing is performed by, for example, a low heat input
bonding method such as high-frequency brazing.
[0031]
Fig. 4 is a schematic cross-sectional view of a modification example of the
protruding container 50 shown in Fig. 2. As shown in Fig. 4, the cylindrical section
51 can be formed of two-divided sections, i.e. a front cylindrical section 51a and a
rear cylindrical section 51b. The front cylindrical section 51a and the rear cylindrical
section 51b are each a cylindrical member configured to accommodate the spring
guide 40 in the hollow section 50e. In the front cylindrical section 51a of the
protruding container 50, one the end section 50a is fixed to the middle container 10a
of the sealed container 10, and another end section 50c is connected to the end
section 50d of the rear cylindrical section 51b by fitting. The front cylindrical section
51a is formed in a taped shape in which the wall thickness of the peripheral wall is
reduced towards the end portion 50a is reduced. In the rear cylindrical section 51b
of the protruding container 50, one the end section 50b is fitted and connected to the
end portion 50c of the front cylindrical section 51a, and a protruding container cover
52 is disposed on another end portion 50b. In the rear cylindrical section 51b of the
protruding container 50, an opening port of the hollow section 50e of the end portion
50b is closed by the protruding container cover 52.
[0032]
In the joining step (step S1), when an iron member is used as the front
cylindrical section 51a, the front cylindrical section 51a of the protruding container 50
can be joined to the middle container 10a of the sealed container 10 by resistance
welding. In the closing step (step S6), the rear cylindrical section 51b of the
protruding container 50 can be joined to the protruding container 5 lid 52 by brazing
when copper members are used as the rear cylindrical section 51b and the protruding
container lid 52. As a method of joining the rear cylindrical section 51b to the
protruding container lid 52 by brazing, high frequency brazing or gas brazing is used,
for example. When an iron member is used as the front cylindrical section 51a, and
a copper member is used as the rear cylindrical section 51b, the front cylindrical
section 51a and the rear cylindrical section 51b can be joined by, for example,
furnace brazing or other methods. When an iron member is used as either one or
both of the rear cylindrical section 51b and the protruding container lid 52, and copper
plating processing is applied to the iron member, it is possible to increase a strength
of the protruding container 50 as compared with a case where copper members are
used as both of the rear cylindrical section 51b and the protruding container lid 52.
In addition, in a case where iron members are used as both the rear cylindrical
section 51b and the protruding container lid 52, the rear cylindrical section 51b can
also be joined to the protruding container lid 52 by resistance welding.
[0033]
[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 rotates due to the driving of the electric operation mechanical section 20, the
rolling piston 33 in the cylinder 31 also rotates together with the rotating shaft 32.
The rolling piston 33 rotates eccentrically, and the vane 35 that is slidably in contact
with the rolling piston 33 makes a piston motion by the rotation of the rolling piston 33.
At this time, the gas refrigerant enters the cylinder chamber 31d surrounded by the
inner peripheral wall 31b1 of the cylinder 31, the rolling piston 33 and the vane 35
from the suction hole 34 of the compression mechanism portion 30 via the suction
pipe 11. The gas refrigerant in the cylinder chamber 31d is compressed as the
volume in the compression chamber 31d2 reduces as the rolling piston 33 rotates.
[0034]
In the compression process of the compression mechanical section 30, the
distal end section 35a of the vane 35 is in contact with the outer peripheral 5 wall 33a of
the rolling piston 33 by the urging force of the spring 36. The vane 35 slides in the
vane groove 31e in the radial direction of the cylinder 31 as the rolling piston 33
eccentrically rotates. At this time, the spring 36 expands and contracts along the
inner wall of the spring guide 40, and the expansion and contraction direction of the
spring 36 is guided by the inner wall of the spring guide 40.
[0035]
The gas refrigerant that has been compressed in the compression chamber
31d2 is discharged into the internal space of the sealed container 10 through a
discharge port (not shown) provided in the upper bearing 38. The gas refrigerant
circulating in the internal space of the sealed container 10 passes through gas holes
(not shown) provided in the rotor 22 and a gap between the stator 21 and the rotor
22, respectively, and reaches the upper part of the inside 10 and is discharged from
the discharge pipe 12 into the refrigerant circuit outside the sealed container 10.
[0036]
As described above, the hermetic compressor 100 has the cylindrical spring
guide 40 that protrudes from the sealed container 10, forms the hollow section 40e
that accommodates the spring 36, and defines the expansion/contraction direction of
the spring 36. The one end section 40a of the spring guide 40 is fixed to the cylinder
31, and also the hollow section 40e is in communication with the insertion hole 31g of
25 the spring 36 that is located in the cylinder 31. The other end section 40b of the
spring guide 40 is closed by the bottom lid section 40c. Then, the spring 36 is
arranged between the back side end section 35b of the vane 35 that is located on a
side opposite to the rolling piston 33 and the bottom lid section 40c of the spring
guide 40 that protrudes from the sealed container 10. Since the spring 36 of the
30 hermetic compressor 100 is arranged between the back side end section 35b of the
vane 35 and the bottom lid section 40c of the spring guide 40 that protrudes from the
sealed container a larger expansion and contraction margin can be secured as
compared with a case where the spring 36 is arranged between the back side end
section 35b and the sealed container 10. In addition, in the hermetic compressor
100, only the spring guide 40 holds the part held between the cylinder 5 31 and the
spring 36 when the spring guide 40 is directly fixed to the cylinder 31, whereby it is
possible to secure the positional precision between the spring 36 and the vane 35.
[0037]
In addition, the hermetic compressor 100 includes the plurality of cylinders 31.
The plurality of spring guides 40 are respectively fixed to the plurality of cylinders 31,
and the protruding container 50 accommodates the plurality of spring guides 40.
Since the protruding container 50 accommodates the plurality of spring guides 40, it is
enough if the joining step (step S1) is performed once, and the manufacturing step for
the hermetic compressor 100 can be simplified as compared with a case where the
joining step is performed for each of the spring guides 40.
[0038]
Further, the protruding container 50 has the cylindrical section 51 formed in a
cylindrical shape and fixed to the sealed container 10, and a protruding container lid
52 that closes an end portion 50b of the cylindrical section 51 located on the side
opposite to the side fixed to the sealed container 10. By attaching the spring guide
40 and the spring 36 from the cylindrical section 51 fixed to the sealed container 10
and then closing the cylindrical section 51 with the protruding container lid 52, thermal
strain of the spring guide 40 and the spring 36 is prevented, whereby the inside of the
protruding container 50 can be sealed.
[0039]
Further, the cylindrical section 51 includes a front cylindrical section 51a fixed
to the sealed container, and a rear cylindrical section 51b fitted to the front cylindrical
section 51a and having the protruding container lid 52 arranged therein. By dividing
the cylindrical section 51, the length of the wall in the axial direction is shortened, and
the worker can perform more easily each step of the joining step (step S1), the
cylinder fixing step (step S2), the spring guide fixing step (step S4), and the spring
attachment step (step S5).
[0040]
In addition, the manufacturing method for the hermetic compressor 100
includes the joining step (step S1), the cylinder fixing step (5 step S2), the vane
arrangement step (step S3), the spring guide fixing step (step S4), the spring
attachment step (step S5), and the closing step (step S6). By attaching the
protruding container 50 to the sealed container 10 as described above, the worker
can prevent thermal distortion of the spring guide 40 and the spring 36 and seal the
inside of the protruding container 50.
[0041]
Further, in the manufacturing method for the hermetic compressor 100, in the
closing step (step S6), the cylindrical section 51 made of an iron member and the
protruding container lid 52 made of an iron member are joined by resistance welding.
Alternatively, in the closing step (step S6), the cylindrical section 51 and the
protruding container lid 52 are joined by brazing. By joining the cylindrical section 51
and the protruding container lid 52 by a joining method with low heat input, thermal
distortion of the spring guide 40 and the spring 36 can be prevented, and the inside of
the protruding container 50 can be sealed.
[0042]
Embodiment 2
Fig. 5 is a vertical cross-sectional view of a hermetic compressor 110 according
to Embodiment 2 of the present disclosure. Parts having the same configurations as
those of the hermetic compressor 100 shown in Figs. 1 to 4 are designated by the
same reference numerals, and the description thereof will be omitted. Items which
are not particularly described in the hermetic compressor 110 according to the
Embodiment 2 are the same as those of the hermetic compressor 100 according to
Embodiment 1, and the same functions and configurations will be described using the
same reference signs.
[0043]
The hermetic compressor 100 according to Embodiment 1 has always one
protruding containers 50 fixed to the middle container 10a regardless of the number of
cylinders 31 arranged in the sealed container 10. On the other hand, in the sealed
compressor 110 according to Embodiment 2, the number of the protruding containers
50 fixed to the middle container 10a changes in accordance with 5 the number of the
cylinders 31 disposed in the sealed container 10. That is, the hermetic compressor
110 has the same number of plurality of protruding container 50 as that of the
cylinders 31. The plurality of protruding containers 50 each accommodates one of
the spring guides 40. For example, as shown in Fig. 5, in the hermetic compressor
110 according to Embodiment 2, when the number of cylinders 31 disposed in the
sealed container 10 is two of the upper cylinder 31A and the lower cylinder 31B, the
number of the protruding containers 50 fixed to the middle container 10a is also two.
Then, in the two protruding container 50, the spring guide 40 fixed to the upper
cylinder 31A is accommodated in one of the protruding container 50, the spring guide
40 fixed to the lower cylinder 31B in the other protruding container 50 is
accommodated.
[0044]
As described above, the hermetic compressor 110 has the plurality of cylinders
31, and the plurality of spring guide 40 are respectively fixed to plurality of cylinders
31. Then, the hermetic compressor 110 has the same number of the plurality of
protruding containers 50 as the number of the plurality of cylinders 31. Each of the
plurality of protruding containers 50 accommodates one spring guide 40. By
accommodating a one spring guide 40, for example, the plurality of the protruding
containers can form a sealed space for each spring 36 even if the fixing location of
the cylinder 31 of the plurality of spring guide 40 varies in each circumferential
direction.
[0045]
The embodiment of the present disclosure is not limited to the above-described
Embodiment 1 and Embodiment 2, and various modifications can be made. For
example, the hermetic compressor 100 and the hermetic compressor 110 have been
described as twin rotary compressors having two cylinders 31, but the hermetic
compressor 100 and the hermetic compressor 110 may be a single rotary compressor
having one cylinder 31. Further, in the hermetic compressor 100, the insertion hole
31g has a circular cross-sectional shape, but the insertion hole 31g may have an
elliptical shape, an oval shape, or a polygonal shape, for example. 5 In this case, the
cross-sectional shape of the cylindrical spring guide 40 is formed in an elliptical
shape, an oval shape, or a polygonal shape in accordance with the cross-sectional
shape of the insertion hole 31g.
Reference Signs List
[0046]
sealed container 10a middle container 10b upper container
c lower container 11 suction pipe 11A suction pipe 11B suction
pipe 12 discharge pipe 13 accumulator 14 pedestal 20 electric
operation mechanical section 21 stator 22 rotor 30 compression
mechanical section 31 cylinder 31A upper cylinder 31B lower cylinder
31b peripheral wall section 31b1 inner peripheral wall 31d cylinder
chamber 31d1 suction chamber 31d2 compression chamber 31e vane
groove 31f outer peripheral wall 31g insertion hole 31g1 inner
peripheral side insertion hole 31g2 outer peripheral side insertion hole 31h
seal pipe 32 rotary shaft 32a eccentric section 33 rolling piston 33a
outer peripheral wall 34 suction hole 34B discharge hole 35 vane
a distal end section 35b back side end section 36 spring 36a
end section 36b end section 37 partition plate 38 upper bearing 39
lower bearing 40 spring guide 40a end section 40b end section 40c
bottom lid section 40e hollow section 50 protruding container 50a end
section 50b end section 50c end section 50d end section 50e hollow
section 51 cylindrical section 51a front cylindrical section 51b rear
cylindrical section 52 protruding container lid 100 hermetic compressor
110 hermetic compressor.

We Claim:
[Claim 1]
A hermetic compressor, comprising:
a sealed container; at least one cylinder that is hollow and is accommodated 5 in the sealed container; a rolling piston configured to rotate eccentrically along an inner peripheral wall of the cylinder; a vane that contacts an outer peripheral wall of the rolling piston and divides a space in the cylinder into a suction chamber and a compression chamber; a spring configured to urge the vane towards an arrangement side of the rolling piston; at least one cylindrical spring guide that protrudes from the sealed container, forms a hollow section that accommodates the spring, and defines an expansion and contraction direction of the spring; and a protruding container that protrudes from the sealed container, forms a sealed space together with the sealed container, and accommodates the spring guide, wherein the cylinder has an insertion hole into which the spring is inserted, one end section of the spring guide is fixed to the cylinder, the hollow section is in communication with the insertion hole, and an other end section of the spring guide is closed by a bottom lid section, and the spring is arranged between a back side end section of the vane that is located on a side opposite to the rolling piston and the bottom lid section.
[Claim 2]
The hermetic compressor of claim 1, wherein
the at least one cylinder comprises a plurality of cylinders,
the at least one spring guide comprises a plurality of spring guides,
the plurality of spring guides are respectively fixed to the plurality of cylinders,
the protruding container accommodates the plurality of spring guides.
[Claim 3]
The hermetic compressor of claim 1, wherein
the at least one cylinder comprises a plurality of cylinders,
the at least one spring guide comprises a plurality 5 of spring guides,
the plurality of spring guides are respectively fixed to the plurality of cylinders,
the protruding container comprises a same number of protruding containers as
the number of the plurality of cylinders, and
each of the protruding containers includes one of the plurality of spring guides.
[Claim 4]
The hermetic compressor of any one of claims 1 to 3, wherein
the protruding container includes
a cylindrical section formed into a cylindrical shape and fixed to the sealed
container, anda protruding container lid that closes an end section located on a side opposite to an end section fixed to the sealed container of the cylindrical section.
[Claim 5]
The hermetic compressor of claim 4, wherein
the cylindrical section includes a front cylindrical section fixed to the sealed container, and a rear cylindrical section that is fit to the front cylindrical section and in which
the protruding container lid is arranged.
[Claim 6]
A manufacturing method for a hermetic compressor, the method
Comprising: a joining step of joining a cylindrical section that is formed into a cylindrical
shape and protrudes from a sealed container to the sealed container that defines an
outline; a cylinder fixing step of fixing a cylinder that is hollow and accommodates a rolling piston into the sealed container;
a vane arrangement step of arranging a vane in a vane groove formed in the
cylinder; a spring guide fixing step of inserting a spring guide that is cylindrical and
defines an expansion and contraction direction of a spring, from a hollow section of
the cylindrical section, and fixing the spring guide to the cylinder, 5 the spring being
configured to urge the vane towards an arrangement side of the rolling piston;
a spring attachment step of inserting the spring to the spring guide, causing
one end of the spring to abut against the vane, and fixing another end to the spring
guide; and a closing step of joining an end section located on a side opposite to an end
side fixed to the sealed container of the cylindrical section to a protruding container lid
to seal the cylindrical section.
[Claim 7]
The manufacturing method for the hermetic compressor of claim 6,
Wherein in the closing step, the cylindrical section formed of an iron member is joined to the protruding container lid formed of an iron member by resistance welding.
[Claim 8]
The manufacturing method for the hermetic compressor of claim 6,
Wherein in the closing step, the cylindrical section is joined to the protruding container lid by brazing.