FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
COMPRESSOR AND REFRIGERATION CYCLE APPARATUS;
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
Technical Field
5 [0001]
The present disclosure relates to a compressor and a refrigeration cycle
apparatus.
Background Art
[0002]
10 Compressors each include a motor that drives a compressing mechanism.
The motor includes a stator on which coils are wound, and a rotor located inward of
the stator. An end portion of each of the coils on the stator is extended to form a
lead wire (see Patent Literature 1, for example). In the compressor disclosed by
Patent Literature 1, distal ends of lead wires are caulked by crimp terminals, and
15 connection terminals for power feed are inserted and fixed between nuts fitted on the
crimp terminals, whereby power can be supplied to the stator of the motor. It should
be noted that that the lead wires are covered by insulating films.
Citation List
Patent Literature
20 [0003]
Patent Literature 1: Japanese Unexamined Patent Application Publication No.
2012-036733
Summary of Invention
Technical Problem
25 [0004]
However, the lead wires are relatively soft and easily deformed, and thus easily
come into contact with a casing, the rotor, or other elements. Moreover, since the
insulating films provided over the lead wires are thin, the insulation characteristics of
the insulating films are poor. Thus, if any of the lead wires comes into contact with
30 the casing or the rotor, an insulation failure occurs.
3
[0005]
The present disclosure is applied to solve the above problem, and relates to a
compressor and a refrigeration cycle apparatus that reduce the probability with which
an insulation failure will occur in lead wires of coils.
Solution 5 to Problem
[0006]
A compressor according to an embodiment of the present disclosure includes a
motor that is provided in a hermetic container, and that includes a stator, a lead wire,
and a rotor. The stator including a stator core on which a coil is wound. The lead
10 wire has a one-end portion connected to the coil and an other-end portion connected
to a power terminal. The rotor is located inward of the stator. A line connecting a
one-end fixed point located at a center of the one-end portion of the lead wire and a
compressor center point located at a center point of the hermetic container and a line
connecting an other-end fixed point located at a center of the other-end portion of the
15 lead wire and the compressor center point intersect each other at an angle of 90
degrees or less..
Advantageous Effects of Invention
[0007]
According to the embodiment of the present disclosure, the line connecting the
20 one-end fixed point and the compressor center point and the line connecting the
other-end fixed point and the compressor center point intersect each other at an
angle of 90 degrees or less. Therefore, the distance from the one-end fixed point to
the other-end fixed point can be reduced to a certain length or less. Thus, the length
of the lead wire is adjusted depending on the distance from the one-end fixed point to
25 the other-end fixed point, whereby the lead wire can be prevented from coming into
contact with the casing, or the rotor, or other components. It is therefore possible to
reduce the probability with an insulation failure will occur in the lead wires.
Brief Description of Drawings
[0008]
4
[Fig. 1] Fig. 1 is a vertical sectional view schematically illustrating a compressor
according to an embodiment of the present disclosure.
[Fig. 2] Fig. 2 is a configuration diagram illustrating a refrigeration cycle
apparatus including the compressor as illustrated in Fig. 1.
[Fig. 3] Fig. 3 is a side view of part of a stator included in a motor 5 as illustrated
in Fig. 1.
[Fig. 4] Fig. 4 is an enlarged view of part of three electric wires serving as lead
wires illustrated in Fig. 3.
[Fig. 5] Fig. 5 is a plan view illustrating the arrangement of the lead wires of
10 coils and power terminals at the compressor as illustrated in Fig. 1.
Description of embodiments
[0009]
Embodiment
Fig. 1 is a vertical sectional view schematically illustrating a compressor
15 according to an embodiment of the present disclosure. Fig. 2 is a configuration
diagram illustrating a refrigeration cycle apparatus including the compressor as
illustrated in Fig. 1. A compressor 12 as illustrated in Fig. 1 is a single-cylinder rotary
compressor.
[0010]
20 The compressor 12 is a component included in a refrigeration cycle apparatus
10 that air-conditions an air-conditioned space. As illustrated in Fig. 2, in the
refrigeration cycle apparatus 10, the compressor 12, a heat-source-side heat
exchanger 13, a pressure reducing device 14, and a load-side heat exchanger 15 are
connected by refrigerant pipes 18, thereby providing a refrigerant circuit 11 in which
25 refrigerant circulates.
[0011]
The compressor 12 sucks the refrigerant, compresses the refrigerant into hightemperature
and high-pressure gas refrigerant, and discharges the high-temperature
and high-pressure gas refrigerant. The heat-source-side heat exchanger 13 is, for
30 example, a fin-and-tube heat exchanger, and causes heat exchange to be performed
5
between outdoor air and the refrigerant. The pressure reducing device 14 is, for
example, an electronic expansion valve, and reduces the pressure of the refrigerant
to expand the refrigerant. The load-side heat exchanger 15 is, for example, a finand-
tube heat exchanger, and causes heat exchange to be performed between air in
the air-conditioned space and the refrigerant. It should 5 be noted that the
refrigeration cycle apparatus 10 may be capable of performing both a cooling
operation and a heating operation. In this case, the refrigerant circuit 11 includes a
four-way valve that switches a flow passage for the refrigerant between a plurality of
flow passages.
10 [0012]
As illustrated in Fig. 1, the compressor 12 includes a hermetic container 20, a
compressing mechanism 30, and a motor 40. The hermetic container 20 is a casing
that forms an outer shell of the compressor 12. To the hermetic container 20, a
suction pipe 21 and a discharge pipe 22 are attached. The suction pipe 21 is a pipe
15 through which the refrigerant is sucked. The discharge pipe 22 is a pipe through
which the refrigerant is discharged. The suction pipe 21 is provided at a suction
muffler 23.
[0013]
The suction muffler 23 is provided beside the hermetic container 20. The
20 suction muffler 23 sucks low-pressure gas refrigerant. In the case where liquid
refrigerant returns into the compressor 12, the suction muffler 23 reduces the amount
of the liquid refrigerant that directly flows into a cylinder chamber 31a of a cylinder 31.
The suction muffler 23 is connected with a suction port of the cylinder 31 by the
suction pipe 21. A main body of the suction muffler 23 is fixed to a side wall of the
25 hermetic container 20 by, for example, welding.
[0014]
The compressing mechanism 30 and the motor 40 are housed in the hermetic
container 20. More specifically, the compressing mechanism 30 is located in an
internal lower region of the hermetic container 20, that is, below the motor 40. The
30 compressing mechanism 30 compresses the refrigerant sucked through the suction
6
pipe 21. The motor 40 housed in the hermetic container 20 is located at a position
through which the refrigerant compressed by the compressing mechanism 30 passes
before being discharged through the discharge pipe 22. That is, the motor 40 is
located in the hermetic container 20 and above the compressing mechanism 30.
5 [0015]
The motor 40 includes a crankshaft 50 and drives the compressing mechanism
30. To be more specific, the compressing mechanism 30 is connected to the motor
40 by the crankshaft 50, through which a turning force exerted by the motor 40 is
transmitted to the compressing mechanism 30.
10 [0016]
The hermetic container 20 stores in a bottom portion of the hermetic container
20, refrigerating machine oil 26 for lubricating sliding portions of the compressing
mechanism 30. The refrigerating machine oil 26 is, for example, synthetic oil such
as polyol ester (POE), polyvinyl ether (PVE), or alkylbenzene (AB).
15 [0017]
A configuration of the compressing mechanism 30 will be described in detail.
The compressing mechanism 30 includes the cylinder 31, a rolling piston 32, a
vane (not illustrated), a main bearing 33, and a sub bearing 34.
[0018]
20 An outer periphery of the cylinder 31 is circular as viewed in plan view. The
cylinder 31 has the cylinder chamber 31a, which is a cylindrical space provided in the
cylinder 31. At two ends of the cylinder 31 in an axial direction of the crankshaft 50,
the cylinder 31 is open. In the following, the axial direction of the crankshaft 50 is
also referred to as "axial direction".
25 [0019]
In the cylinder 31, a vane groove (not illustrated) is provided to communicate
with the cylinder chamber 31a and extend in a radial direction. Also, a backpressure
chamber (not illustrated) is provided outward of the vane groove. The
back-pressure chamber is a space that communicates with the vane groove and has
30 a circular shape as viewed in plan view. The cylinder 31 further has a discharge port
7
(not illustrated) through which the compressed refrigerant is discharged from the
cylinder chamber 31a. The discharge port is provided by cutting an upper end face
of the cylinder 31.
[0020]
The rolling piston 32 is formed in the shape of a ring. The 5 rolling piston 32
performs an eccentric motion in the cylinder chamber 31a. The rolling piston 32 is
fitted in an eccentric shaft portion 51 of the crankshaft 50 such that the rolling piston
32 can be slid. Specifically, the rolling piston 32 is provided in the cylinder chamber
31a, and is rotated in close contact with an inner wall of the cylinder 31 in accordance
10 with the rotary motion of the eccentric shaft portion 51 of the crankshaft 50.
[0021]
The vane is formed in the shape of a cuboid having flat surfaces. The vane is
provided in the vane groove of the cylinder 31. The vane is pushed against the
rolling piston 32 at all times by a vane spring (not illustrated) provided in the back15
pressure chamber. Since the pressure in the hermetic container 20 is high, when
the compressor 12 starts to operate, a back surface of the vane, that is, a surface of
the vane that faces the back-pressure chamber, is given a force generated by the
difference between the pressure in the hermetic container 20 and the pressure in the
cylinder chamber 31a. Thus, the vane spring is used to push the vane against the
20 rolling piston 32 when the pressure in the hermetic container 20 is not different from
the pressure in the cylinder chamber 31a as mainly at the start-up time of the
compressor 12.
[0022]
The main bearing 33 is inverted T-shaped as viewed side-on. The main
25 bearing 33 is fitted in part of the crankshaft 50 that is located above the eccentric
shaft portion 51, that is, on a main shaft portion 52 provided on a motor side where
the motor 40 is located, such that the main bearing 33 can be slid. The main bearing
33 closes upper sides of the cylinder chamber 31a and the vane groove of the
cylinder 31.
30 [0023]
8
The sub bearing 34 is inverted T-shaped as viewed side-on. The sub bearing
34 is fitted in part of the crankshaft 50 that is located below the eccentric shaft portion
51, that is, on a sub shaft portion 53, such that the sub bearing 34 can be slid. The
sub bearing 34 closes lower sides of the cylinder chamber 31a and the vane groove
of 5 the cylinder 31.
[0024]
The main bearing 33 has a discharge valve (not illustrated). A discharge
muffler 35 is provided on an outer surface of the main bearing 33. High-temperature
and high-pressure gas refrigerant discharged through the discharge valve temporarily
10 enters the discharge muffler 35 and is then made to flow out from the discharge
muffler 35 to the space in the hermetic container 20. It should be noted that the
discharge valve and the discharge muffler 35 may be provided at the sub bearing 34
or at each of the main bearing 33 and the sub bearing 34.
[0025]
15 The cylinder 31, the main bearing 33, and the sub bearing 34 are each made
of, for example, gray iron, sintered steel, or carbon steel. The rolling piston 32 is
made of, for example, alloy steel containing, for example, chromium. The vane is
made of, for example, a high-speed tool steel.
[0026]
20 A configuration of the motor 40 will be described in detail.
The motor 40 according to the embodiment is a single-phase induction motor.
[0027]
The motor 40 includes a stator 41 and a rotor 42. The stator 41 is fixed to the
hermetic container 20 in contact with an inner circumferential surface of the hermetic
25 container 20. The rotor 42 is provided on an inner circumferential side of the stator
41, with an air gap having approximately 0.3 to 1 [mm] provided between the rotor 42
and the stator 41.
[0028]
The stator 41 includes a stator core 43 and coils 44. Specifically, the stator 41
30 is formed by winding the coils 44 on the stator core 43. The stator core 43 is formed
9
by punching an electromagnetic steel sheet having a thickness of approximately 0.1
to 1.5 [mm] to obtain a plurality of pieces having a predetermined shape, stacking the
pieces in the axial direction, and fixing the pieces to each other by, for example,
caulking or welding.
5 [0029]
In an outer periphery of the stator core 43, a plurality of cuts are provided at
regular intervals in a circumferential direction. The cuts serve as respective
passages for the gas refrigerant to be discharged from the discharge muffler 35 to the
space in the hermetic container 20. The cuts also serve as respective passages for
10 the refrigerating machine oil 26 that returns from a region located above the motor 40
to the bottom of the hermetic container 20.
[0030]
The coils 44 each include a main coil and an auxiliary coil, which are not
illustrated. The coils 44 are wound on a plurality of teeth (not illustrated),
15 respectively, provided at the stator core 43. Electric wires used as the coils 44 each
include a core wire and at least one coating layer that covers the core wire, which are
not illustrated.
[0031]
The motor 40 includes lead wires 45 that are formed by extending end portions
20 of the respective coils wound on the stator 41. One of end portions of each of the
lead wires 45 is electrically connected to an associated one of the coils 44. The
other end portion of each lead wire 45 is electrically connected to an associated one
of power terminals 24, with a cluster 46 interposed between the other end portion and
the associated power terminal 24. In an example illustrated in Fig. 1, three power
25 terminals 24 project upwards from a seat 25.
[0032]
The rotor 42 is an aluminum die-cast squirrel-cage rotor. The rotor 42
includes a rotor core 47, conductors (not illustrated), and end rings 48. The rotor
core 47, as well as the stator core 43, is formed by punching an electromagnetic steel
30 sheet having a thickness of approximately 0.1 to 1.5 [mm] to obtain a plurality of
10
pieces of a predetermined shape, stacking the pieces in the axial direction, and fixing
the pieces together by, for example, caulking or welding. The conductors are made
of aluminum. The conductors are filled or inserted into respective slots provided in
the rotor core 47. The end rings 48 short-circuit the conductors at both ends of each
of the conductors. As a result, a squirrel-cage 5 coil is formed.
[0033]
The rotor core 47 has a plurality of through-holes (not illustrated) that extend
through the rotor core 47 in the axial direction. The through-holes, as well as the
cuts in the stator core 43, serve as the respective passages for the gas refrigerant to
10 be discharged from the discharge muffler 35 to the space in the hermetic container
20.
[0034]
Fig. 3 is a side view of part of the stator included in the motor as illustrated in
Fig. 1. Fig. 4 is an enlarged view of part of each of the three electric wires serving
15 as the lead wires as illustrated in Fig. 3. A configuration related to binding of the
wires in the compressor 12 according to the embodiment will be specifically described
with reference to Figs. 3 and 4.
[0035]
As illustrated in Fig. 3, three electric wires as the lead wires 45 are formed by
20 bundling the three electric wires, that is, a first lead wire 71, a second lead wire 72,
and a third lead wire 73. The three electric wires have different potentials. Thus, in
order to insulate the three wires from each other, core wires 45a of the three wires are
covered by respective insulating tubes 45b (see Fig. 4).
[0036]
25 In the embodiment, the lead wires 45 are a plurality of electric wires that are
continuous with the respective coils 44. Specifically, the electric wires serving as the
lead wires 45 are formed by directly extending end portions of the respective coils 44.
Therefore, as illustrated in Fig. 4, the electric wires serving as the lead wires 45, as
well as the coils 44, each include a core wire 45a and at least one insulating tube 45b
30 that serving as at least one coating layer covering the core wire 45a.
11
[0037]
The first lead wire 71 is a lead wire for a common coil. The second lead wire
72 is a lead wire for a main coil. The third lead wire 73 is a lead wire for an auxiliary
coil. The first lead wire 71, the second lead wire 72, and the third lead wire 73 are
formed by directly extending the end portions of the respective coils 5 44. That is, the
one-end portions of the electric wires serving as the lead wires 45 according to the
embodiment are continuous with the coils 44.
[0038]
The first lead wire 71, the second lead wire 72, and the third lead wire 73 are
10 caulked by respective crimp terminals. Specifically, as illustrated in Fig. 4, a distal
end of the first lead wire 71 is caulked by a caulking portion 91 of a first crimp terminal
81, a distal end of the second lead wire 72 is caulked by a caulking portion 92 of a
second crimp terminal 82, and a distal end of the third lead wire 73 is caulked by a
caulking portion 93 of a third crimp terminal 83.
15 [0039]
As illustrated in Fig. 3, the first crimp terminal 81, the second crimp terminal 82,
and the third crimp terminal 83 are inserted in the cluster 46. The cluster 46 is a
block-shaped molded component made of resin such as polybutylene terephthalate
(PBT). The cluster 46 has terminal-insertion portions 46a into which the power
20 terminals 24 are inserted. When the power terminals 24 are inserted into the
terminal-insertion portions 46a and connected to the cluster 46, the first crimp
terminal 81, the second crimp terminal 82, and the third crimp terminal 83 can be
connected to the respective power terminals 24. Thus, the other end of each of the
lead wires 45 is electrically connected to an associated one of the power terminals 24
25 through an associated one of the crimp terminals. The cluster 46 and the power
terminals 24 can be very easily connected to each other. Therefore, by using the
cluster 46, connection between the other end of each of the lead wires 45 and the
associated one of the power terminals 24 can be more efficiently achieved, thus
improving the workability.
30 [0040]
12
Fig. 5 is a plan view illustrating the arrangement of the lead wires of the coils
and the power terminals at the compressor as illustrated in Fig. 1. The locations of a
one-end portion and an other-end portion of each of the lead wires 45 in the
compressor 12 according to the embodiment will be specifically described with
reference to Fig. 5. In Fig. 5, part of an upper surface of the hermetic 5 container 20 is
omitted in order to clarify the starting point of each of the lead wires 45.
[0041]
The center of the hermetic container 20 as viewed in the plan view of Fig. 5 will
be referred to as a compressor center point 100; the center of the one-end portions of
10 the lead wires 45 will be referred to as a one-end fixed point 101; and the center of
the other-end portions of the lead wire 45 will be referred to an other-end fixed point
102.
[0042]
The compressor center point 100 is located at the center of the hermetic
15 container 20 as the hermetic container 20 is viewed from above. That is, the
compressor center point 100 is located at the center of a cross section of the hermetic
container 20 that is taken along a plane perpendicular to the axial direction.
[0043]
The coils 44 are bundled and fixed at a plurality of positions by binding cords
20 44a. The lead wires 45 start to be projected from the coils 44 at one of the binding
cords 44a. Therefore, in the embodiment, as illustrated in Fig. 5, the one-end fixed
point 101 is located at the center of the boundary between the coils 44 and the lead
wires 45. That is, the one-end fixed point 101 is located at the center of a region
where the lead wires 45 start to be raised from the coils 44.
25 [0044]
In the embodiment, as illustrated in Fig. 5, the other-end fixed point 102 is
located at the center of a region where the other ends of the lead wires 45 are
caulked by the crimp terminals. Although Fig. 5 indicates by way of example the
other-end fixed point 102 at the position of the caulking portion 92, it is not limiting.
13
The other-end fixed point 102 is located at an arbitrary position determined depending
on, for example, the arrangement of the caulking portions 91 to 93.
[0045]
In the embodiment, an angle O at which a line L1 connecting the one-end fixed
point 101 and the compressor center point 100 and a line L2 connecting 5 the other-end
fixed point 102 and the compressor center point 100 intersect each other is 90
degrees or less. It should be noted that in the description, the angle at which two
lines intersect each other means a smaller one of two angles at which the two lines
intersect each other, that is, an angle of 180 degrees or less.
10 [0046]
Specifically, the power terminals 24 and the seat 25 are provided such that the
angle O at which the line L1 and the line L2 intersect each other in an extension
direction D in which the lead wires 45 are raised from the coils 44 is 90 degrees or
less. In this case, the position of the one-end fixed point 101 for the power terminals
15 24 and the seat 25 may be adjusted such that the above angle O is 90 degrees or
less.
[0047]
In such a manner, since the lead wires 45 and the power terminals 24 are
provided such that the angle O at which the line L1 and the line L2 intersect each
20 other is 90 degrees or less, the distance from the one-end fixed point 101 to the
other-end fixed point 102 can be reduced to a certain distance or less. The length of
the lead wires 45 can be made as small as possible depending on the distance from
the one-end fixed point 101 to the other-end fixed point 102, that is, a positional
relationship between the one-end fixed point 101 and the power terminals 24. It is
25 therefore possible to prevent the lead wires 45 from slacking and coming into contact
with the hermetic container 20, the rotor 42, or other elements. Thus, it is possible to
reduce the probability that an insulation failure will occur at the lead wires 45.
[0048]
Furthermore, in the embodiment, an angle 1 at which a line L1 connecting the
30 compressor center point 100 and the one-end fixed point 101 and a line L3 connecting
14
the other-end fixed point 102 and the one-end fixed point 101 intersect each other is
also 90 degrees or less. As a result, the other-end fixed point 102 and the
compressor center point 100 are relatively close to each other. It is therefore
possible to further reduce the probability that the lead wires 45 will come into contact
with the hermetic 5 container 20.
[0049]
Also, in the embodiment, the angle 2 at which the line L2 connecting the
compressor center point 100 and the other-end fixed point 102 and the line L3
connecting the one-end fixed point 101 and the other-end fixed point 102 intersect
10 each other is 90 degrees or less. That is, the interior angles of a triangle formed by
connecting the compressor center point 100, the one-end fixed point 101, and the
other-end fixed point 102 are all 90 degrees or less. Thus, the distance from the
compressor center point 100 to the one-end fixed point 101 and the distance from the
compressor center point 100 to the other-end fixed point 102 are not greatly different
15 from each other. Therefore, the slack of the lead wires 45 is reduced, and the lead
wires 45 can be more stably provided.
[0050]
The length of the lead wires 45 is determined depending on the positional
relationship between the one-end fixed point 101 and the power terminals 24. In the
20 embodiment, the length of the lead wires 45 is set to the shortest possible length
based on the positional relationship between the one-end fixed point 101 and the
power terminals 24. It should be noted that the greater the difference in level
between the one-end portion and the other-end portion of each lead wire 45, the
longer the lead wire 45.
25 [0051]
The motor 40 is configured and provided as described above. Therefore, in
the process of connecting the cluster 46 to the power terminals 24 of the compressor
12, the load applied to the one-end portion of each of the lead wires 45 is reduced.
Thus, the one-end portion of each lead wire 45 is not easily broken. Furthermore,
30 since the distance from the one-end fixed point 101 to the other-end fixed point 102 is
15
reduced, the lead wires 45 are not easily dispersed, and the ease of handling of the
lead wires 45 is thus improved. As a result, the workability in the process of
connecting the cluster 46 to the power terminals 24 is improved, and it is possible to
efficiently prevent the lead wires 45 from coming into contact with the hermetic
container 20, the rotor 42, 5 or other elements.
[0052]
In an existing compressor, lead wires of coils of a motor are twisted so as not to
come into contact with a hermetic container or a rotor. However, if the lead wires are
twisted, the probability that the one-end portion of each of electric wires serving as
10 the lead wires may be easily broken; that is, the electric wires may be easily broken
on a one-end portion side where the electric wires start to be extended from the coils.
Furthermore, the other-end portions of the lead wires that are caulked by respective
crimp terminals has a low mechanical strength. Therefore, if the lead wires are
twisted, the lead wires are easily broken when nuts are fitted on the lead wires or
15 when connection terminals for power feed are fixed to the lead wires.
[0053]
In view of the above, in the embodiment, the positional relationship between
the binding cord 44a at the point from which the lead wires 45 are extended and the
power terminals 24 is determined based on the above angle O, etc. Therefore, the
20 distance from the one-end portion of each of the lead wires 45 to the other-end
portion of each lead wire 45 is relatively short. Thus, the lead wires 45 do not need
to be twisted, and thus the one-end portions of the lead wires 45 on the one-end
portion side where the lead wires 45 start to be extended from the coils 44 and the
other-end portions of the lead wires 45 that are caulked by the crimp terminals can be
25 each made to have a sufficient strength.
[0054]
Although Fig. 5 indicates a configuration example in which the angle O is
approximately 45 degrees, it is not limiting. That is, the angle O may be 45 degrees
or less (0 degrees < O  45 degrees) or greater than 45 degrees (45 degrees < O 
30 90 degrees). For example, the one-end portions of the lead wires 45 and the power
16
terminals 24 may be provided such that the angle O falls within the range of 30
degrees to 60 degrees (30 degrees  O  60 degrees). It should be noted that
although there is a case where if the angle O is too small, the workability is reduced,
the angle O may be reduced to 0 degrees, depending on the difference in level
between the one-end fixed point 101 and the other-end 5 fixed point 102.
[0055]
The electric wires serving as the lead wires 45 may be either copper wires or
aluminum wires. For example, all the electric wires serving as the lead wires 45 may
be copper wires. As compared with the aluminum wires, the copper wires are hard,
10 and thus do not easily bend. Thus, in the case where the copper wires are used as
the lead wires 45, the lead wires 45 can be more reliably prevented from coming into
contact with the hermetic container 20, the rotor 42, or other components. In
addition, since the copper wires have a lower resistance than the aluminum wires, the
motor efficiency can be increased. It should be noted that the copper wires are
15 disadvantageous in workability, since the copper wires are harder than the aluminum
wires. However, in the embodiment, since the lead wires 45 are arranged as above,
it is possible to prevent the reduction of the workability that may occur in the case of
adopting the copper wires.
[0056]
20 Alternatively, all the electric wires serving as the lead wires 45 may be
aluminum wires. As compared with the copper wires, the aluminum wires are soft
and more advantageous in workability. Furthermore, the aluminum wires are more
inexpensive than the copper wires. Therefore, in the case where aluminum wires
are used as the lead wires 45, the workability can be improved, and the cost can be
25 reduced. It should be noted that the aluminum wires have a lower tensile strength
and a lower flexural strength than the copper wires. However, in the embodiment,
since the lead wires 45 are arranged as above, the load to be applied to the lead
wires 45 is reduced.
[0057]
17
Furthermore, at least one of the electric wires serving as the lead wires 45 may
be an aluminum wire. For example, at least one of the electric wires serving as the
lead wires 45 may be an aluminum wire, and the other electric wire or wires may be
copper wires. In the example illustrated in Fig. 4, the following cases are
conceivable: the case where the second lead wire 72 is an aluminum 5 wire (the core
wire 45a of the second lead wire 72 is made of aluminum) and the third lead wire 73
is a copper wire (the core wire 45a of the third lead wire 73 is made of copper); and
the case where the second lead wire 72 is a copper wire (the core wire 45a of the
second lead wire 72 is made of copper) and the third lead wire 73 is an aluminum
10 wire (the core wire 45a of the third lead wire 73 is made of aluminum). In such a
manner, electric wires can be selected in consideration of the balance between the
workability, the motor efficiency, and the cost. It is therefore possible to provide lead
wires 45 that meet the user's needs, and thus improve the usability. It should be
noted that in the embodiment, the one-end portions of the electric wires serving as
15 the lead wires 45 are continuous with the coils 44. Therefore, the material of the
electric wires serving as the lead wires 45 is the same as the material of the electric
wires serving as the coils 44.
[0058]
As described above, in the compressor 12 according to the embodiment, the
20 line L1 connecting the one-end fixed point 101 and the compressor center point 100
and the line L2 connecting the other-end fixed point 102 and the compressor center
point 100 intersect each other at the angle O of 90 degrees or less. Therefore, the
distance from the one-end fixed point 101 to the other-end fixed point 102 can be
reduced to a certain length or less. Thus, the length of the lead wires 45 is adjusted
25 depending on the distance from the one-end fixed point 101 to the other-end fixed
point 102, whereby the lead wires 45 can be prevented from coming into contact with
the hermetic container 20, the rotor, or other components. It is therefore possible to
reduce the probability with which an insulation failure will occur in the lead wires 45.
[0059]
18
Specifically, in the compressor 12 according to embodiment, the lead wires 45
for electrically connecting the coils 44 of the motor 40 to the power terminals 24 of the
compressor 12 can be connected to the respective power terminals 24 such that the
distance between each of the lead wires 45 and the associated one of the power
terminals 24 is the shortest possible distance. Therefore, it is 5 not necessary to
provide a step of twisting the lead wires 45 to prevent the lead wires 45 from coming
into contact with the hermetic container 20, the rotor 42, or other components. That
is, the one-end portions and the other-end portions of the lead wires 45 are kept
straight without being twisted. Thus, it is ensured that the one-end portion and the
10 other-end portion of each of the lead wires 45 have a sufficiently high tensile strength
and a sufficiently high flexural strength, and the lead wires 45 can be prevented from
coming into contact with the hermetic container 20, the rotor 42, or other components.
Therefore, the workability of binding of the wires of the motor 40 can be improved,
and the probability with which an insulation failure will occur in the lead wires 45 can
15 be reduced. That is, in the compressor 12, the workability of binding of the wires of
the motor 40 and the reliability of the compressor 12 can be both improved.
[0060]
In addition, the length of the lead wires 45 is set to the shortest possible length
based on the positional relationship between the one-end fixed point 101 and the
20 power terminals 24. It is therefore possible to prevent the lead wires 45 from
slacking and twisting, and more reliably prevent the lead wires 45 from coming into
contact with the hermetic container 20, the rotor 42, or other elements. Thus, the
probability with which an insulation failure will occur in the lead wires 45 can be
reduced with a higher accuracy.
25 [0061]
It should be noted that the embodiment described above is a preferable
example of each of the compressor and the refrigeration cycle apparatus, and the
description concerning the embodiment is not limiting. For example, although Fig. 5
illustrates the case where the interior angles of the triangle formed by connecting the
30 compressor center point 100, the one-end fixed point 101, and the other-end fixed
19
point 102 are each 90 degrees or less, it is not limiting. For example, the angle 1 at
which the line L1 and the line L3 intersect each other may be greater than 90 degrees
and smaller than 180 degrees. Likewise, the angle 2 at which the line L2 and the
line L3 intersect each other may be greater than 90 degrees and smaller than 180
5 degrees.
[0062]
Although it is described above by way of example that the lead wires 45 are
each continuous with an associated one of the coils 44, it is not limiting, and the
electric wires serving as the lead wires 45 may be provided separately from the
10 electric wires serving as the coils 44. That is, the one-end portions of the electric
wires serving as the lead wires 45 may be connected to the coils 44, with the
connection terminals interposed between the one-end portions of the lead wires 45
and the coils 44. Furthermore, the other-end portions of the electric wires serving as
the lead wires 45 may be caulked by the crimp terminals and connected to the power
15 terminals 24 by the crimp terminals. In this case, the lead wires 45 can be
connected to the coils 44 afterward, regardless of the length and material of each of
the electric wires serving as the coils 44. Thus, lead wires 45 having a required
length can be made of material that meets the user's needs or other requirements.
[0063]
20 It should be noted that each of the first lead wire 71, the second lead wire 72,
and the third lead wire 73 may be a single wire or a combination of a plurality of wires.
With respect to the embodiment, although it is described above by way of example
that all the core wires 45a of the lead wires 45 are covered by the respective
insulating tubes 45b, it is not limiting, and a plurality of core wires 45a may be
25 covered by a single insulating tube 45b, as long as those core wires 45a have the
same potential. For example, although Fig. 4 illustrates the case where the first lead
wire 71 is made up of two electric wires, and the core wires 45a of the electric wires
are covered by respective insulating tubes 45b, the two core wires 45a of the first
lead wire 71 may be covered by a single insulating tube 45b.
30 [0064]
20
Furthermore, although it is described above by way of example that the motor
40 is an induction motor, it is not limiting, and the motor 40 may be a motor other than
the induction motor, such as a brushless DC (direct-current) motor. That is, the
configurations of the motor 40 as described above can be also applied to the motor
other than the induction motor. Moreover, the motor 40 is not limited 5 to a singlephase
motor and may be a three-phase motor. In addition, as the compressor 12,
for example, a multi-cylinder rotary compressor or a scroll compressor can be
employed.
[0065]
10 In the case where a brushless DC motor is employed as the motor 40, a
plurality of insertion holes are formed in the rotor core 47, and permanent magnets
are fitted in the insertion holes. The permanent magnets are, for example, ferrite
magnets or rare-earth magnets. To prevent the permanent magnets from coming off
in the axial direction, an upper end plate and a lower end plate are provided at an
15 upper end and a lower end of the rotor 42, that is, two axial ends of the rotor 42,
respectively. The upper end plate and the lower end plate also serve as rotation
balancers. The upper end plate and the lower end plate are fixed to the rotor core
47 by a plurality of fixing rivets or other fixtures.
Reference Signs List
20 [0066]
10 refrigeration cycle apparatus 11 refrigerant circuit 12 compressor
13 heat-source-side heat exchanger 14 pressure reducing device 15 loadside
heat exchanger 18 refrigerant pipe 20 hermetic container 21 suction
pipe 22 discharge pipe 23 suction muffler 24 power terminal 25 seat 26
25 refrigerating machine oil 30 compressing mechanism 31 cylinder 31a
cylinder chamber 32 rolling piston 33 main bearing 34 sub bearing 35
discharge muffler 40 motor 41 stator 42 rotor 43 stator core 44 coil
44a binding cord 45 lead wire 45a core wire 45b insulating tube 46
cluster 46a terminal-insertion portion 47 rotor core 48 end ring 50
30 crankshaft 51 eccentric shaft portion 52 main shaft portion 53 sub shaft
21
portion 71 first lead wire 72 second lead wire 73 third lead wire 81 first
crimp terminal 82 second crimp terminal 83 third crimp terminal 91 to 93
caulking portion 100 compressor center point 101 one-end fixed point 102
other-end fixed point D extracting direction 1, 2, O arrangement angle
5
22
We Claim :
[Claim 1]
A compressor comprising a motor that is provided in a hermetic container, and
that includes a stator, a lead wire, and a rotor, the stator including a stator core on
which a coil is wound, the lead wire having a one-end portion connected 5 to the coil
and an other-end portion connected to a power terminal, the rotor being located
inward of the stator,
wherein a line connecting a one-end fixed point located at a center of the oneend
portion of the lead wire and a compressor center point located at a center point of
10 the hermetic container and a line connecting an other-end fixed point located at a
center of the other-end portion of the lead wire and the compressor center point
intersect each other at an angle of 90 degrees or less.
[Claim 2]
The compressor of claim 1, wherein the line connecting the compressor center
15 point and the one-end fixed point and a line connecting the other-end fixed point and
the one-end fixed point intersect each other at an angle of 90 degrees or less.
[Claim 3]
The compressor of claim 1 or 2, wherein the line connecting the compressor
center point and the other-end fixed point and a line connecting the one-end fixed
20 point and the other-end fixed point intersect each other at an angle of 90 degrees or
less.
[Claim 4]
The compressor of any one of claims 1 to 3, wherein a length of the lead wire is
set to the shortest possible length based on a positional relationship between the
25 one-end fixed point and the power terminal.
[Claim 5]
The compressor of any one of claims 1 to 4, wherein the lead wire is made up
of a plurality of electric wires each having a one-end portion that is continuous with
the coil.
30 [Claim 6]
23
The compressor of claim 5, wherein each of the electric wires included in the
lead wire has an other-end portion that is caulked by a crimp terminal and connected
to the power terminal, with the crimp terminal interposed between the other-end
portion and the power terminal.
5 [Claim 7]
The compressor of any one of claims 1 to 4, wherein the lead wire is made up
of a plurality of electric wires each of which has
a one-end portion connected to the coil, with a connection terminal interposed
between the one-end portion and the coil; and
10 an other-end portion caulked by a crimp terminal and connected to the power
terminal, with the crimp terminal interposed between the other-end portion and the
power terminal.
[Claim 8]
The compressor of any one of claims 5 to 7, wherein each of the electric wires
15 in the lead wire is a copper wire.
[Claim 9]
The compressor of any one of claims 5 to 7, wherein at least one of the electric
wires in the lead wire is an aluminum wire.
[Claim 10]
20 The compressor of claim 9, wherein each of the electric wires in the lead wire is
an aluminum wire.
24
[Claim 11]
A refrigeration cycle apparatus comprising:
the compressor of any one of claims 1 to 10; and
a refrigerant circuit in which the compressor, a heat-source-side heat
exchanger, a pressure reducing device, and a load-side 5 heat exchanger are
connected by refrigerant pipes, and in which refrigerant circulates.