JP7042455B2 - Compressor - Google Patents

Description

The present disclosure relates to compressors used in air conditioners, refrigerators, water heaters, and the like.

Generally, a compressor is configured by accommodating a compression mechanism unit that compresses a refrigerant gas and an electric motor unit that drives the compression mechanism unit in a closed container. The motor unit is composed of a stator fixed to the inner wall surface of the closed container and a rotor for transmitting rotational power to the drive shaft, and the stator is fixed to the inner wall surface of the closed container by shrink fitting or. This was done by welding (see, for example, Patent Document 1 and Patent Document 2).

FIG. 16 shows the compressor described in Patent Document 1. In this compressor, the stator 101 of the motor unit 100 is fixed to the inner peripheral surface of the closed container 102 by a shrink fit 103. Further, FIG. 17 shows the compressor described in Patent Document 2. In this compressor, the stator 201 of the motor unit 200 is fixed to the inner peripheral surface of the closed container 202 by welding 204.

Japanese Patent Application Laid-Open No. 2003-254274 Japanese Unexamined Patent Publication No. 2008-45331

However, fixing the stator 101 by shrink fitting in the compressor of Patent Document 1 has a problem that the efficiency of the motor unit 100 is lowered due to the contraction stress of the closed container 102. That is, compressive stress is applied to the stator plate constituting the stator 101, and the magnetic characteristics of the stator plate deteriorate, causing a decrease in the efficiency of the motor unit 100.

Further, also in the case of fixing the stator 201 by welding 204 in the compressor of Patent Document 2, stress due to high temperature and high heat due to welding 204 is applied to the stator 201, and the stator plate constituting the stator 201 is distorted, resulting in an electric motor. It causes a decrease in efficiency of the unit 200.

In any compressor, it is formed between the inner peripheral surface of the stator 101 and 201 and the outer peripheral surface of the rotor due to the deformation of the stator plate due to the distortion, that is, the deformation of the stator 101 and 201. There is also a problem that the air gap is displaced, the exciting force of the drive mechanism is increased, and the operating noise of the compressor is increased.

The present disclosure has been made in view of such a point, and provides a highly efficient and quiet compressor by reducing stress and strain generated in the stator plate.

In the present disclosure, the stator of the motor portion is configured by laminating a contact stator plate that abuts on the inner surface of the closed container and a main stator plate having a smaller diameter than this, and the contact stator plate is formed on the inner surface of the closed container. In addition to fixing to, a gap is provided between the main stator plate and the inner surface of the closed container , the contact stator plate is provided with a through hole for the refrigerant passage inside the outer peripheral edge thereof, and the main stator plate is in contact with the main stator plate. A recess for the refrigerant passage is formed in the outer peripheral edge portion facing the through hole of the stator plate, and the recess for the refrigerant passage has an area smaller than the opening for the refrigerant passage by the through hole, and is formed on the outer peripheral edge of the main stator plate. The opening for the refrigerant passage due to the gap between the closed container and the recess for the refrigerant passage is set to the same area level as the through hole .

With this configuration, stress and strain due to shrink fitting of the stator to the inner surface of the closed container or fixing such as welding can be limited to the contact stator plate only, and stress and strain can be prevented from being generated in the main stator plate. .. Therefore, it is possible to prevent a decrease in operating efficiency of the compressor due to stress and strain, and it is also possible to reduce noise generation due to deformation of the stator and to calm down.

FIG. 1 is a vertical sectional view of the compressor according to the first embodiment. FIG. 2 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the first embodiment. FIG. 3 is a plan view showing a stator plate of the electric motor portion of the compressor according to the first embodiment. FIG. 4 is a vertical sectional view of the compressor according to the second embodiment. FIG. 5 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the second embodiment. FIG. 6 is a perspective view of a stator constituting the electric motor portion of the compressor according to the second embodiment. FIG. 7 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the third embodiment. FIG. 8 is a cross-sectional view of a stator plate constituting the electric motor portion of the compressor according to the fourth embodiment. FIG. 9 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the fifth embodiment. FIG. 10 is a vertical sectional view of the compressor according to the sixth embodiment. FIG. 11 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the sixth embodiment. FIG. 12 is a plan view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 13 is a perspective view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 14 is a half-cut perspective view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 15 is a plan view showing a stator plate of the motor unit according to the sixth embodiment. FIG. 16 is an explanatory diagram showing a stator fixing configuration of a conventional compressor. FIG. 17 is a cross-sectional view showing a stator fixing configuration of another conventional compressor.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a vertical sectional view of the compressor according to the first embodiment. FIG. 2 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the first embodiment. FIG. 3 is a plan view showing a stator plate of the motor unit in the compressor according to the first embodiment.

The compressor in the present embodiment is configured by providing a motor unit 2 and a compression mechanism unit 3 in a closed container 1. The closed container 1 is composed of a cylindrical housing 5, an upper cover 6 that closes the opening of the housing 5, and a lower cover 7.

The compression mechanism portion 3 is arranged at the lower part of the closed container 1. Further, the motor unit 2 is arranged on the compression mechanism unit 3 inside the closed container 1. The motor unit 2 is connected to the compression mechanism unit 3 by a drive shaft 4.

The upper cover 6 is provided with a terminal 8 for supplying electric power to the motor unit 2. An oil reservoir 9 for holding lubricating oil is formed at the bottom of the closed container 1.

The motor unit 2 is composed of a stator 10 and a rotor 11. The rotor 11 holds the drive shaft 4 and rotates together with the drive shaft 4. The drive shaft 4 is rotatably supported by an upper bearing member 12 located above the compression mechanism portion 3 and a lower bearing member 13 located below the compression mechanism portion 3.

When electric power is supplied to the electric motor unit 2 and the drive shaft 4 rotates, the drive shaft eccentric unit 14 of the drive shaft 4 rotates eccentrically inside the cylinder 15 of the compression mechanism unit 3. Along with the eccentric rotation of the drive shaft eccentric portion 14, the rolling piston 16 in the cylinder 15 rotates while abutting on a vane (not shown) protruding into the cylinder 15 with a variable protrusion amount. As a result, the suction and compression of the refrigerant gas are repeated. The compression mechanism portion 3 is composed of an upper bearing member 12, a lower bearing member 13, a cylinder 15, a rolling piston 16, and a vane (not shown).

A discharge pipe 17 is provided on the upper part of the closed container 1. The discharge pipe 17 penetrates the upper part of the upper cover 6 and opens toward the internal space of the closed container 1, and discharges the refrigerant gas compressed by the compression mechanism unit 3 to the outside of the closed container 1. It plays a role as a flow path. During operation of the compressor, the internal space of the closed container 1 is filled with the compressed refrigerant.

Further, a suction connecting pipe 19 for supplying a refrigerant to the compression mechanism portion 3 is provided in the lower part of the closed container 1, and the suction connecting pipe 19 is connected to an accumulator 18 for separating the refrigerant gas into gas and liquid. The accumulator 18 is provided with a refrigerant gas introduction pipe 20 at the upper portion and a refrigerant gas outlet pipe 21 connected to the suction connection pipe 19 at the lower portion.

In the compressor configured as described above, the stator 10 of the motor unit 2 is configured by laminating a plurality of stator plates 22 formed by punching a thin plate, for example, a thin plate of an electromagnetic steel plate. The stator plate 22 is formed from the contact stator plate 22a having a large diameter that abuts on the inner surface of the closed container 1 shown in FIG. 3A and the contact stator plate 22a shown in FIG. 3B. Also consists of a small-diameter main stator plate 22b. The abutting stator plate 22a is laminated and arranged so as to form the central portion of the stator 10, and the main stator plate 22b is laminated and arranged on the upper and lower portions of the abutting stator plate 22a.

Then, the stator 10 fixes the contact stator plate laminated portion 22A on which the contact stator plates 22a are laminated to the inner surface of the closed container 1 by shrink fitting or welding. The main stator plate laminated portion 22B on which the main stator plates 22b are laminated is arranged above and below the abutting stator plate laminated portion 22A, and the entire outer periphery thereof has a slight gap between the inner surface and the inner surface of the closed container 1. In this example, a minute gap X equal to or larger than the plate thickness of the main stator plate 22b is formed.

Next, the operation and effect of the compressor configured as described above will be described.

As described above, in the compressor of the present embodiment, the stator 10 of the motor unit 2 is configured by laminating the abutting stator plate 22a and the main stator plate 22b, and the abutting stator plate laminating portion 22A. Is fixed to the closed container 1 by shrink fitting, welding, or the like, so that a minute gap X is formed between the main stator plate laminated portion 22B and the inner surface of the closed container 1 over the entire outer periphery thereof.

Therefore, the main stator plate laminated portion 22B is not subjected to stress such as a strong compressive force when fixed by shrink fitting or welding. Therefore, in the main stator plate laminated portion 22B, the magnetic characteristics do not decrease due to stress, and the efficiency of the motor portion can be prevented from decreasing.

Further, it is possible to prevent an air gap shift between the inner peripheral surface of the stator 10 and the outer peripheral surface of the rotor 11, which may occur when the main stator plate laminated portion 22B is deformed due to distortion. It is possible to reduce the operating noise of the compressor.

In addition, since the main stator plate 22b in which the minute gap X is formed between the inner surface of the closed container 1 is not subjected to the stress from the closed container 1, the plate thickness can be made thinner, and the main stator plate laminated portion 22B can be made thinner. The magnetic characteristics can be greatly improved.

As described above, the compressor in the present embodiment reduces the deterioration of the magnetic characteristics due to the stress and strain of the main stator plate laminated portion 22B, and reduces the thickness of the main stator plate laminated portion 22B to make it magnetic. The characteristics can be improved, and both of these actions make it possible to obtain a highly efficient compressor.

(Second embodiment)
FIG. 4 is a vertical sectional view of the compressor according to the second embodiment. FIG. 5 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the second embodiment. FIG. 6 is a perspective view of a stator constituting the electric motor portion of the compressor according to the second embodiment.

In the compressor of the present embodiment, the contact stator plate 22a is laminated and arranged on the upper and lower portions of the stator 10, and the main stator plate 22b is arranged on the upper and lower contact stators so as to form the central portion of the stator 10. It is laminated and arranged between the plate laminated portions 22A. The main stator plate 22b has a smaller diameter than the contact stator plate 22a, as in the first embodiment. Then, the abutting stator plate laminated portions 22A located above and below the stator 10 are fixed to the inner surface of the closed container 1 by shrink fitting or welding, and the main stator plates located between the abutting stator plate laminated portions 22A. A minute gap X is formed between the laminated portion 22B and the inner surface of the closed container 1.

Other configurations are the same as those of the first embodiment, and the same parts are numbered the same and the description thereof will be omitted.

In the compressor according to the present embodiment configured as described above, the contact stator plate laminated portion 22A is provided at two positions above and below the stator 10, and the contact stator plate laminated portions 22A at the two locations are used in the closed container 1. Since it is fixed, the stator 10 can be reliably fixed to the closed container 1, and the quality and reliability can be improved.

That is, since the main stator plate laminated portion 22B of the stator 10 is not fixed to the closed container 1, there is a concern that the stator 10 may be displaced inside the closed container 1 due to its own weight and cause a decrease in efficiency. However, in the present embodiment, the stator 10 is fixed at a plurality of locations, and in this example, the abutting stator plate laminated portions 22A at the upper and lower two positions of the stator 10 are fixed to the closed container 1, so that the main stator plate laminated portion Although 22B is not fixed to the closed container 1, the fixing of the stator 10 to the closed container 1 can be ensured.

Moreover, since the abutting stator plate laminated portion 22A is arranged at two upper and lower locations and is fixed to the closed container 1 by the abutting stator plate laminating portion 22A at the two locations, the stator does not cause axial shake. 10 can be fixed to the container.

Therefore, the compressor in the present embodiment can prevent the efficiency decrease and the generation of abnormal noise due to the displacement of the stator 10 and the axis deviation, etc., and can be a compressor with higher reliability and quality.

(Third embodiment)
FIG. 7 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the third embodiment.

In the compressor of the present embodiment, the contact stator plate laminated portion 22A is arranged at three places in the upper, middle and lower parts of the stator 10.

Other configurations are the same as those of the first embodiment and the second embodiment, and the same parts are designated by the same number and the description thereof will be omitted.

Since the compressor in the present embodiment has many contact stator plate laminated portions 22A to be fixed to the closed container 1 at three places, the fixing of the stator 10 to the closed container 1 is further strengthened. This makes it possible to further improve the reliability and quality of the compressor.

The contact stator plate laminated portion 22A may be provided at three or more locations, and the positions may be other than the positions shown in the present embodiment.

(Fourth Embodiment)
FIG. 8 is a cross-sectional view of a stator plate constituting the electric motor portion of the compressor according to the fourth embodiment.

In the compressor of the present embodiment, the plate thickness T of the contact stator plate 22a shown in FIG. 8A is thicker than the plate thickness t of the main stator plate 22b shown in FIG. 8B. There is. For example, the plate thickness T of the contact stator plate 22a is 0.3 mm to 0.5 mm, and the plate thickness t of the main stator plate 22b is 0.05 mm to 0.2 mm.

Both the contact stator plate 22a and the main stator plate 22b are made of electrical steel sheets, but the materials thereof may be different as described later.

Other configurations are the same as those of the first embodiment to the third embodiment, and the same parts are designated by the same number and the description thereof will be omitted.

In the compressor of the present embodiment, the plate thickness T of the contact stator plate 22a fixed to the closed container 1 is thicker than the plate thickness t of the main stator plate 22b, so that the contact stator plate 22a The strength is improved and the fixing to the closed container 1 becomes stronger.

Therefore, it is possible to prevent the stator 10 from being displaced in the closed container 1 and improve the quality and performance.

That is, at the same time as the effect of improving the magnetic characteristics of the main stator plate laminated portion 22B by thinning the main stator plate 22b described above, the fixing of the stator 10 can be ensured, and the efficiency and quality of the compressor can be improved. And it is possible to realize both improvement of reliability.

As described above, in the compressor of the present embodiment, the thickness of the main stator plate laminated portion 22B is reduced while suppressing the deformation of the contact stator plate laminated portion 22A and suppressing the positional deviation of the stator 10. The magnetic properties can be improved, and both of these actions can improve the efficiency and quality of the compressor.

(Fifth Embodiment)
FIG. 9 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the fifth embodiment.

In the compressor of the present embodiment, in addition to the configurations of the first embodiment to the third embodiment, the contact stator plate 22a and the main stator plate 22b constituting the stator 10 of the motor unit 2 are included. Is made of different materials.

Specifically, the contact stator plate 22a fixed to the closed container 1 is made of a material having high strength against stress, and the main stator plate 22b is weak against stress but has a great effect on improving efficiency. As a low material. For example, in this example, the contact stator plate 22a is formed of an electromagnetic steel plate having high strength against stress, and the main stator plate 22b is formed of an amorphous alloy or nanocrystalline soft magnetic material which is fragile but has low iron loss. There is.

Other configurations are the same as those of the first embodiment to the third embodiment, and the same parts are designated by the same number and the description thereof will be omitted.

With the above configuration, the compressor in the present embodiment can enhance the effect of suppressing the efficiency decrease due to the stress of the portion of the stator 10 fixed to the closed container 1, that is, the contact stator plate laminated portion 22A. Further, the main stator plate laminated portion 22B having a minute gap X between the closed container 1 and the main stator plate 22B has less iron loss than the case where the main stator plate laminated portion 22B is formed of the same material as the contact stator plate 22a, so that the efficiency is high. In addition, the main stator plate 22b made of an amorphous alloy or a nanocrystal material can be made into a sheet-like thin plate having a thickness of several tens of microns, which is about 1/10 of the conventional thickness. Can also be obtained.

Therefore, the compressor in the present embodiment can be made into a highly efficient compressor due to the high efficiency improving effect of the main stator plate laminated portion 22B. Moreover, since the strength of the contact stator plate 22a is high, the compressor in the present embodiment is also strong in fixing the stator 10 to the closed container 1, and is the same as the compressor in the fourth embodiment. Or even more, it is possible to improve the efficiency of the compressor and improve the quality and reliability at the same time.

(Sixth Embodiment)
FIG. 10 is a vertical sectional view of the compressor according to the sixth embodiment. FIG. 11 is an enlarged cross-sectional view showing an electric motor portion of the compressor according to the sixth embodiment. FIG. 12 is a plan view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 13 is a perspective view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 14 is a half-cut perspective view of a stator constituting the electric motor portion of the compressor according to the sixth embodiment. FIG. 15 is a plan view showing a stator plate of the motor unit according to the sixth embodiment.

As shown in FIGS. 13, 14, and 15, the compressor of the present embodiment is provided with a plurality of through holes 23 for the refrigerant passage inside the outer peripheral edge of the contact stator plate 22a of the stator 10. The main stator plate 22b has a plurality of recesses 24 for the refrigerant passage formed in the outer peripheral edge portion of the contact stator plate 22a facing the through hole 23, and the refrigerant passages of the contact stator plate 22a and the main stator plate 22b. The configuration is different.

Other configurations are the same as those of the first embodiment to the fourth embodiment, and the same parts are designated by the same number and the description thereof will be omitted.

In the compressor of the present embodiment, the through hole 23 for the refrigerant passage provided in the contact stator plate 22a is provided inside the outer peripheral edge of the contact stator plate, so that the contact stator plate laminated portion 22A is sealed. The fixing to the container 1 can be strengthened.

More specifically, if a recess similar to that of the main stator plate 22b is formed on the outer peripheral edge of the abutting stator plate 22a to form a refrigerant passage, the outer peripheral edge of the abutting stator plate 22a hits the inner surface of the closed container 1. The contact area is reduced only by the portion of the recess, and the fixing force to the closed container 1 is reduced.

However, according to the configuration of the present embodiment, since the entire circumference of the outer peripheral edge of the contact stator plate 22a can be a contact portion with the inner surface of the closed container 1, the contact stator plate laminated portion 22A The contact length with the inner surface of the closed container 1 can be increased, and the fixing area of the contact stator plate 22a to the closed container 1 can be increased to increase the fixing force to the inner surface of the closed container. Therefore, the fixing of the contact stator plate laminated portion 22A to the closed container 1 can be strengthened.

Further, the main stator plate 22b of the stator 10 hits the main stator plate 22b by forming a recess 24 for the refrigerant passage in the outer peripheral edge portion of the contact stator plate 22a facing the through hole 23. Even if the diameter is smaller than that of the contact stator plate 22a, it is possible to secure an opening for the refrigerant passage having the same area level as the through hole 23 provided in the contact stator plate 22a in the main stator plate laminated portion 22B.

That is, if a through hole similar to that of the contact stator plate 22a is formed in the main stator plate 22b for the refrigerant passage, the through hole becomes smaller due to the smaller diameter of the main stator plate 22b. However, if a recess 24 is formed on the outer peripheral edge of the main stator plate 22b to serve as a refrigerant passage, the refrigerant passage has the same area level as the through hole 23 provided in the abutting stator plate 22a on the main stator plate laminated portion 22B. An opening can be secured.

Therefore, the compressor in the present embodiment can secure the refrigerant passage area while maintaining the firm fixing to the inner surface of the closed container by the contact stator plate laminated portion 22A, and suppresses the strain deformation of the stator 10. Moreover, it is possible to obtain an efficient compressor having good flowability of the refrigerant.

The compressor according to the present disclosure has been described above using each embodiment, but the present disclosure is not limited to this.

For example, the configuration of each embodiment is not only used by the embodiment alone, but may be used in combination with the configuration of other embodiments as appropriate.

Further, in the above embodiment, the compressor having a rotary compression mechanism has been described, but a compressor such as a scroll type, a reciprocating type, or a screw type may be used, and can be applied to compressors of various compression types.

Further, in the above embodiment, the case where the inside of the closed container 1 is filled with the high temperature high pressure refrigerant gas has been described as an example, but the low pressure type compressor in which the inside of the closed container is filled with the low pressure refrigerant gas has been described as an example. It may be a machine.

That is, the embodiments disclosed this time are exemplary and not restrictive in all respects, and the scope of the present disclosure is indicated by the scope of claims, meaning and all within the meaning and scope equivalent to the scope of claims. Changes are included.

As described above, the compressor in the first disclosure is a compressor in which a motor unit and a compression mechanism unit driven by the motor unit are housed in a closed container. The stator of the motor part is configured by laminating a contact stator plate that comes into contact with the inner surface of the closed container and a main stator plate having a diameter smaller than that of the contact stator plate, and the contact stator plate is formed on the inner surface of the closed container. It is configured to have a gap between the main stator plate and the inner surface of the closed container.

With this configuration, the stress and strain caused by fixing the stator to the inner surface of the closed container are limited to the contact stator plate portion, and the stress and strain due to fixing such as shrink fitting or welding are generated in the main stator plate portion. It is possible to prevent the efficiency from being lowered due to stress and strain, and to improve the efficiency. Furthermore, noise generation due to deformation of the stator can be reduced and quietness can be achieved.

In the first disclosure, the compressor in the second disclosure may have a configuration in which the laminated portions of the abutting stator plates of the stator are at least two or more.

With this configuration, the stator is fixed to the closed container at multiple points, so even if there is a part that is not fixed to the closed container, it can be securely fixed to the closed container, and the position shift due to the weight of the stator itself. Etc. can be prevented and reliability and quality can be improved.

In the second disclosure, the compressor in the third disclosure may be configured such that the laminated portion of the abutting stator plate of the stator is formed in two places, the upper part and the lower part of the stator.

With this configuration, the stator is fixed to the closed container at both the upper and lower parts, so that it can be efficiently and surely fixed to the closed container without shaking the axis, effectively improving reliability and quality. Can be done.

In the second disclosure, the compressor in the fourth disclosure may have the laminated portions of the abutting stator plates of the stator at both the upper and lower portions of the stator and a plurality of places between them.

With this configuration, the stator is fixed to the closed container at multiple points above and below it and between them, so that the fixing to the closed container can be strengthened and the reliability and quality can be improved more effectively. Can be done.

In the first to fourth disclosures, the compressor in the fifth disclosure may be formed of a material having a higher strength than the main stator plate in the contact stator plate of the stator.

With this configuration, the strain deformation itself of the contact stator plate fixed to the closed container can be reduced, the efficiency decrease due to the strain at the contact stator plate portion can be suppressed, and the efficiency can be further improved. ..

In the first to fourth disclosures, the compressor in the sixth disclosure may make the plate thickness of the contact stator plate of the stator larger than the plate thickness of the main stator plate.

With this configuration, the strength of the contact stator plate fixed to the closed container is improved and strain deformation is reduced, and the efficiency decrease due to strain at the contact stator plate portion is suppressed to further improve the efficiency. Can be improved.

As described above, the present disclosure can be a highly efficient and quiet compressor by suppressing deterioration and strain of the magnetic characteristics of the stator plate due to shrink fitting fixing, welding fixing, and the like. Therefore, it can be used as a compressor for a freezing system of various devices such as an air conditioner, a refrigerator, and a water heater.

1 Airtight container 2 Motor part 3 Compression mechanism part 4 Drive shaft 5 Housing 6 Upper cover 7 Lower cover 8 Terminal 9 Oil reservoir 10 Stator 11 Rotor 12 Upper bearing member 13 Lower bearing member 14 Drive shaft eccentric part 15 Cylinder 16 Rolling piston 17 Discharge pipe 18 Accumulator 19 Suction connection pipe 20 Refrigerator gas introduction pipe 21 Stator gas outlet pipe 22 Stator plate 22a Abutment stator plate 22A Abutment stator plate laminated part 22b Main stator plate 22B Main stator plate laminated part 23 Through hole 24 recess

Claims (6)

It is a compressor configured by accommodating a motor unit and a compression mechanism unit driven by the motor unit in a closed container, and the stator of the motor unit is a contact stator that abuts on the inner surface of the airtight container. The plate and the main stator plate having a diameter smaller than that of the contact stator plate are laminated and configured, and the contact stator plate is shrink-fitted or welded to the inner surface of the closed container to fix the main stator plate. A gap is provided between the air and the inner surface of the airtight container .
The contact stator plate is provided with a through hole for a refrigerant passage inside the outer peripheral edge thereof.
The main stator plate forms a recess for the refrigerant passage in the outer peripheral edge portion of the contact stator plate facing the through hole.
The recess for the refrigerant passage has an area smaller than the opening for the refrigerant passage by the through hole.
A compressor in which the opening for the refrigerant passage by the gap between the closed container and the recess for the refrigerant passage formed on the outer peripheral edge of the main stator plate is set to the same area level as the through hole . The compressor according to claim 1 , wherein the laminated portions of the contact stator plates are formed at at least two or more locations of the stator. The compressor according to claim 2, wherein the laminated portion of the contact stator plate is formed in two places, an upper portion and a lower portion of the stator. The compressor according to claim 2, wherein the laminated portion of the contact stator plate is located between two places of the upper part and the lower part of the stator and two places of the upper part and the lower part thereof. The compressor according to any one of claims 1 to 4, wherein the contact stator plate is made of a material having a higher strength than the main stator plate. The compressor according to any one of claims 1 to 4, wherein the plate thickness of the contact stator plate is made thicker than the plate thickness of the main stator plate.

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