CN106989026B

CN106989026B - Rotary compressor

Info

Publication number: CN106989026B
Application number: CN201610037017.3A
Authority: CN
Inventors: 束宏飞; 李庆才
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2016-01-20
Filing date: 2016-01-20
Publication date: 2020-05-12
Anticipated expiration: 2036-01-20
Also published as: CN106989026A

Abstract

The present invention relates to a rotary compressor. The rotary compressor includes a casing, a compression mechanism, and an oil sump. The compression mechanism is disposed within the housing and is in a first pressure environment or a vacuum environment, and the sump is within the housing and is in a second pressure environment, wherein the pressure in the second pressure environment is greater than the pressure in the first pressure environment.

Description

Rotary compressor

Technical Field

The present invention relates to a rotary compressor.

Background

Most of the existing rotary compressors are high-pressure side compressors, namely, high-temperature and high-pressure exhaust gas is arranged in a shell of the compressor. The shell of the compressor is internally provided with a motor, a compression mechanism and an oil storage tank. Thus, during operation of the compressor, the motor, the compression mechanism and the sump are all in a high pressure, high temperature environment. The high temperature and high pressure gas surrounding the compression mechanism transfers heat to the low temperature and low pressure gas entering the compression mechanism through the intake duct, thereby reducing the power and therefore the energy efficiency of the compressor.

Accordingly, it is desirable in the art to provide a compressor capable of reducing the amount of heat transferred to a compression mechanism to improve energy efficiency.

Disclosure of Invention

It is an object of one or more embodiments of the present invention to provide a compressor capable of reducing the amount of heat transferred to a compression mechanism to improve energy efficiency and/or facilitate lubricant management.

One aspect of the present invention provides a rotary compression mechanism including a housing, a compression mechanism, and a sump. The compression mechanism is disposed within the housing and is in a first pressure environment or a vacuum environment, and the sump is within the housing and is in a second pressure environment, wherein the pressure in the second pressure environment is greater than the pressure in the first pressure environment. For example, the pressure in the first pressure environment may be less than or equal to the suction pressure, and the pressure in the second pressure environment may be the discharge pressure.

In the rotary compression mechanism, since the compression mechanism is in a low-pressure environment or a vacuum environment, the influence of heat transfer on the gas in the compression mechanism can be reduced, and the efficiency of the compression mechanism and the compressor can be improved. In addition, since the sump is under high pressure, this facilitates circulation and management of the lubricating oil.

The sump may be located on one side of the compression mechanism. In addition, the rotary compressor includes a motor located within the shell on an opposite side of the compression mechanism from the sump and also at a second pressure environment.

Preferably, the rotary compressor further includes a first supporting portion and a second supporting portion for supporting the compression mechanism, the first supporting portion and the second supporting portion being respectively located at both sides of the compression mechanism. The first support and/or the second support are hermetically and hermetically connected to the housing so as to form a first pressure environment or a vacuum environment between the first support and the second support.

Preferably, the first support and/or the second support are welded to the housing.

Preferably, a sealing means is provided between the first support and the housing; and/or a sealing device is arranged between the second support part and the outer shell. For example, the sealing means may be an O-ring.

Preferably, a first cavity is provided in the first support part; and/or a second cavity is provided in the second support part. The first cavity and/or the second cavity is in communication with a first pressure environment or a vacuum environment surrounding the compression mechanism such that the first pressure environment or the vacuum environment is within the first cavity and/or the second cavity.

The first cavity and the second cavity can block high-temperature exhaust gas from transferring heat to low-temperature intake air in the compression mechanism, so that the power loss of the compressor can be further reduced.

Preferably, a communication channel may be provided in the pump body of the compression mechanism, via which the first cavity and/or the second cavity communicates with a first pressure environment or a vacuum environment surrounding the compression mechanism.

Preferably, a first annular groove extending substantially in the radial direction is provided on the outer peripheral surface of the first support portion; and/or a second annular groove extending substantially in the radial direction is provided on the outer peripheral surface of the second support portion. The first annular groove and the second annular groove can block high-temperature exhaust gas from transferring heat to low-temperature intake air in the compression mechanism, so that the power loss of the compressor can be further reduced.

Preferably, the first annular groove and/or the second annular groove are located closer to the compression mechanism relative to the hermetically sealed position.

The first support may comprise a first bearing block and/or a first cover plate and/or a bracket. The second support portion may include a second bearing housing and/or a second cover plate. Any group (e.g., any two or all three) of the first bearing housing, the first cover plate, and the bracket are formed as one body, or formed separately and connected together. The second bearing housing and the second cover plate may be formed as one body, or separately formed and coupled together.

Preferably, the compression mechanism comprises a pump body, a piston moving in the pump body and a slide abutting against the piston, the slide dividing a space between the piston and the pump body into a suction chamber and a discharge chamber. A sliding vane accommodating part for accommodating the sliding vane is arranged in the pump body. The vane receiving portion is in communication with the oil sump and a second pressure environment of the motor. Thus, high pressure exhaust gas can be allowed to fill into the sliding sheet accommodating part, and the high pressure exhaust gas can provide bias force for the sliding sheet to enable the sliding sheet to tightly abut against the piston.

Preferably, a choke plug is provided in the slide receiving portion to isolate a first pressure environment or vacuum environment around the compression mechanism from an environment within the slide receiving portion.

Preferably, the compression mechanism includes one or more lubricant passages that allow lubricant to flow to the sump. The design of the lubricant channels may vary according to specific needs.

Preferably, the lubricant passage is provided close to the air discharge passage in the compression mechanism. In this way, the temperature difference can be reduced to reduce the heat transfer effect.

Preferably, an oil sump is provided in one of the first support portion and the second support portion adjacent to the motor, the oil sump communicating with the lubricant passage.

Preferably, the intake conduit of the rotary compressor is clearance fitted into the compression mechanism to enable the compression mechanism to be at the first pressure environment. Alternatively, the intake duct of the rotary compressor is interference-fitted to the compression mechanism to enable the compression mechanism to be in a vacuum environment.

Preferably, a valve for allowing or preventing gas to pass therethrough to maintain the first pressure environment or the vacuum environment is provided on the first support and/or the second support.

The compression mechanism according to the present invention is, for example, a single-cylinder rotor type compression mechanism, a two-cylinder rotor type compression mechanism, or a multi-cylinder rotor type compression mechanism.

In another aspect of the present invention, there is also provided a rotary compressor including a casing, a compression mechanism, a first support part, and/or a second support part. The compression mechanism is disposed within the shell. The first support portion and/or the second support portion are configured to support the compression mechanism. The first support part and/or the second support part are/is provided with a cavity for blocking heat transfer from high-temperature exhaust gas to low-temperature intake gas.

Preferably, an annular groove extending in the radial direction is provided on at least a part of the outer circumferential surface of the first support portion and/or the second support portion. The annular groove may extend continuously or intermittently.

Preferably, the first support and/or the second support are hermetically connected to the housing.

Preferably, the annular groove is located closer to the compression mechanism than to the hermetically sealed position.

The first support and/or the second support may be welded to the housing; or sealing means may be provided between the first support and/or the second support and the housing. For example, the sealing means may be an O-ring.

In another aspect of the present invention, there is also provided a rotary compressor comprising a pump body, a piston moving within the pump body, and a vane abutting to the piston. A sliding vane accommodating part for accommodating the sliding vane is arranged in the pump body. The slide sheet containing part is communicated with a space containing high-pressure exhaust.

Preferably, the vane receptacle is configured to also communicate with the lubricant passage.

Drawings

The features and advantages of one or more embodiments of the present invention will become more readily understood from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 is a longitudinal sectional view of a rotary compressor according to an embodiment of the present invention;

fig. 2 is a longitudinal sectional view of a rotary compressor according to another embodiment of the present invention;

fig. 3 is a longitudinal sectional view of a rotary compressor according to still another embodiment of the present invention;

fig. 4 is an exploded schematic view of a portion of a rotary compressor according to an embodiment of the present invention;

fig. 5 is another exploded schematic view of a portion of a rotary compressor according to an embodiment of the present invention;

FIG. 6 is a perspective view of a pump body of a compression mechanism according to an embodiment of the present invention;

fig. 7 is a schematic view of an upper bearing of a rotary compressor according to an embodiment of the present invention;

fig. 8 is a schematic view of a lower bearing of a rotary compressor according to an embodiment of the present invention;

fig. 9 is another schematic view of a lower bearing of a rotary compressor according to an embodiment of the present invention;

FIG. 10 is a schematic view of an upper cover plate of a compression mechanism according to an embodiment of the present invention;

FIG. 11 is a schematic top view of a lower cover plate of a compression mechanism according to an embodiment of the invention;

FIG. 12 is a schematic bottom view of a lower cover plate of a compression mechanism according to an embodiment of the invention;

FIG. 13 is a perspective cross-sectional view taken along line C-C of FIG. 12;

FIG. 14 is a cross-sectional view taken along line C-C of FIG. 12; and

fig. 15 is a partially cut-away schematic view of a lower cover plate of a compression mechanism according to an embodiment of the present invention.

Detailed Description

The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. For convenience of description, a rotary compressor including a dual-cylinder rotor type compression mechanism will be described herein as an example. However, it should be understood that the present invention may be applicable to any suitable type of compressor, for example, a compressor including a single cylinder compression mechanism or a multi-cylinder compression mechanism, a vertical compressor, or a horizontal compressor.

A rotary compressor according to an embodiment of the present invention will be described with reference to fig. 1 to 3. The compressor shown in the drawings includes a housing 30, a motor 50 disposed within the housing, and a compression mechanism 10. In the illustrated vertical compressor, the motor 50 is positioned above the compression mechanism 10, and the oil sump 20 is formed below the compression mechanism 10 and at the bottom of the compressor. The compression mechanism 10 is supported by the upper bearing housing 210 and the lower bearing housing 310.

The housing 30 may include a cylindrical body 31, a top cover 32, and a bottom cover 33. A top cover 32 and a bottom cover 33 are respectively coupled to both ends of the cylindrical body 31 to form a closed inner space. The motor 50 includes a stator 51 and a rotor 53. The stator 51 is fixedly connected to the cylindrical body 31, and the rotor 53 is radially inside the stator 51 and is rotatable relative to the stator 51. A rotating shaft (also referred to as a crankshaft) 15 extends through a central hole of the rotor 53 and is fixedly connected to the rotor 53 to rotate together with the rotor 53. During operation of the compressor, the rotor 53 rotates the rotary shaft 15, and the rotary shaft 15 in turn drives the compression mechanism to compress low-temperature and low-pressure gas introduced through the intake passage. The compressed gas discharged from the compression mechanism passes through a gap between the motor 50 and the casing 30 and a gap between the rotor 53 and the stator 51, reaches an upper portion of the compressor, and is discharged via a discharge duct 35 provided in the head cover 32.

In the illustrated example, the compression mechanism 10 is a two-cylinder rotary compression mechanism. Referring to fig. 4 and 5, the compression mechanism 10 includes a first compression assembly, a second compression assembly, and a partition 150 disposed between the first compression assembly and the second compression assembly. The first compression assembly includes a first pump body 110, a first piston (or rotor) 120, and a first vane 130. The first pump body 110 is connected to the upper bearing housing 210 and the lower bearing housing 310, for example, by bolts. The first pump body 110 has a central through hole in which the first piston 120 is received and can roll along an inner circumferential wall of the first pump body 110. A notch 118 is formed on the inner peripheral wall of the first pump body 110 for receiving the first vane 130. A spring 119 may be provided at one end of the first slide 130 to bias the first slide 130 towards the first piston 120 so that the first slide 130 may be tightened against the first piston 120. Thus, the first vane 130 divides a space between the first piston 120 and the first pump body 110 into a suction chamber and a discharge chamber. The second compression assembly includes a second pump body 160, a second piston 170, and a second vane 180. The various components of the second compression assembly may have a similar structure to the various components of the first compression assembly and are therefore not described in detail herein.

An upper bearing 210 is disposed above the first compressing assembly, and an upper cover plate 220 and a bracket 230 are disposed on the upper bearing 210. However, it is understood that any one or both of the upper bearing 210, the upper cover plate 220, and the bracket 230 may be omitted according to actual needs. Any two of the upper bearing 210, the upper cover plate 220, and the bracket 230 may be formed in one body, or all may be formed in one body. The upper bearing 210, the upper cover plate 220 and the bracket 230 constitute a first supporting part 200 for the first compressing assembly. In addition, a lower bearing 310 is disposed below the second compression assembly, and a lower cover plate 320 is disposed below the lower bearing 310. However, it should be understood that the lower bearing 310 and the lower cover plate 320 may be formed as one body. The lower bearing 310 and the lower cover plate 320 constitute a second support 300 for the second compression assembly.

The structure of the pump body of the compression mechanism according to the present invention will be described with reference to fig. 6. The first pump body 110 of the first compression assembly is shown in FIG. 6. An exhaust passage 114 may be provided in the first pump body 110. In addition,

lubricant passages

112 and 113 may be provided in the first pump body 110. In addition, one end of the cutout 118 may be provided as the lubricant passage 111. It will be appreciated that the number and configuration of lubricant passages may vary according to actual needs. Accordingly, a discharge passage communicating with the discharge passage 114 of the first pump body 110 and a lubricant passage communicating with the

lubricant passages

112 and 113 of the first pump body 110 are provided in the partition plate 150 and the second pump body 160 of the second compression assembly.

The structure of the lower bearing 310 of the compression mechanism according to the present invention will be described with reference to fig. 8 and 9. The lower bearing 310 is provided therein with

lubricant passages

311, 312, and 313 communicating with the

lubricant passages

111, 112, and 113 of the pump body, respectively, and is also provided with a vent passage 314 communicating with the vent passage 114 of the pump body. In addition, a recess 315 communicating with the discharge passage 314 and a discharge hole 316 for communicating the discharge chamber of the second compression assembly with the recess 315 are also provided in the lower bearing 310.

Referring to fig. 11, there is shown a lower cover plate 320 of a compressor according to the present invention. The lower cover plate 320 is mounted on the lower bearing 310 shown in fig. 8, for example, by bolts. The lower cover plate 320 is provided therein with

lubricant passages

321, 322, and 323. The

lubricant passages

321, 322, and 323 communicate with the

lubricant passages

311, 312, and 313 of the lower bearing 310, respectively, thereby allowing the lubricant to return to the sump 20.

Referring to fig. 7, there is shown an upper bearing 210 of a compressor according to an embodiment of the present invention. The upper portion 210 is provided therein with

lubricant passages

211, 212, and 213 that communicate with the

lubricant passages

111, 112, and 113 of the pump body, respectively, and is also provided with a vent passage 214 that communicates with the vent passage 114 of the pump body. In addition, a recess 215 and a discharge hole 216 for communicating the discharge chamber of the first compression assembly with the recess 215 are also provided in the upper bearing 210. The upper bearing 210 is provided therein with an oil sump 219 communicating with the

lubricant passages

211, 212, and 213, the oil sump 219 collecting lubricant therein.

Referring to fig. 10, there is shown an upper cover plate 220 of a compressor according to the present invention. The upper cover plate 220 is mounted on the upper bearing 210 shown in fig. 7, for example, by bolts. The upper cover plate 220 is provided therein with a vent passage 224 communicating with the vent passage 214 of the upper bearing 210, and a vent hole 227 communicating with the recess 215. In the illustrated example, the compressor has two discharge ports 227. However, it should be understood that the number and configuration of the vent holes 227 may vary depending on the actual needs.

The lubricant returning process of the compressor according to the present invention will be described with reference to fig. 4 and 5. The lubricant collected in the oil sumps 219 of the upper bearings 210 may be returned to the oil sump 20 via the lubricant passages 211 of the upper bearings 210, the lubricant passages 111 of the first pump body 110, the lubricant passages 151 of the partition plate 150, the lubricant passages 161 of the second pump body 160, the lubricant passages 311 of the lower bearings 310, and the lubricant passages 321 of the lower cover plates 320 in this order. In addition, the lubricant in the oil sump 219 may be returned to the oil sump 20 via the lubricant passage 212 of the upper bearing 210, the lubricant passage 112 of the first pump body 110, the lubricant passage 152 of the partition plate 150, the lubricant passage 162 of the second pump body 160, the lubricant passage 312 of the lower bearing 310, and the lubricant passage 322 of the lower cover plate 320 in this order; and may be returned to the oil sump 20 via the lubricant passage 213 of the upper bearing 210, the lubricant passage 113 of the first pump body 110, the lubricant passage 153 of the partition plate 150, the lubricant passage 163 of the second pump body 160, the lubricant passage 313 of the lower bearing 310, and the lubricant passage 323 of the lower cover plate 320 in this order.

The discharge process of the compressor according to the present invention will be described with reference to fig. 4 and 5. The compressed gas in the discharge chamber of the first compression assembly enters the recess 215 through the discharge hole 216 in the upper bearing 210 and then flows toward the discharge duct 35 through the discharge hole 227 in the upper cover plate 220, via the gap in the motor and the gap between the motor and the housing. In addition, the compressed gas in the discharge chamber of the second compression assembly enters the recess 315 via the discharge hole 316 in the lower bearing 310, and flows through the discharge passage 314 of the lower bearing 310, the discharge passage 164 of the second pump body 160, the discharge passage 154 of the partition plate 150, the discharge passage 114 of the first pump body 110, the discharge passage 214 of the upper bearing 210, and the discharge passage 224 of the upper cover plate 220 in this order. In this way, the high-temperature and high-pressure exhaust gas flows through the motor and is discharged through the exhaust duct 35. Therefore, the motor is in a high-temperature and high-pressure environment.

In the conventional high-pressure side compressor, the compression mechanism is in a high-temperature and high-pressure environment like a motor, and a low-temperature and low-pressure gas entering an inlet chamber of the compression mechanism through an inlet pipe is heated. This results in a loss of refrigeration and power to the compressor, thereby reducing the energy efficiency of the compressor.

However, the compressor according to the present invention may overcome the above problems by having the compression mechanism in a low pressure environment (which may be referred to as a first pressure environment) or a vacuum environment. In one example, a support for supporting a compression mechanism according to the present invention may be hermetically sealed to a housing such that the compression mechanism is in a low pressure or vacuum environment. The low pressure environment or the first pressure environment may be equal to or less than a suction pressure (suction pressure) of the gas entering the compression mechanism.

As shown in fig. 1 and 2, an O-ring may be provided between the upper bearing 210 and the cylindrical body 31 of the housing 30 (see also fig. 4), and an O-ring may be provided between the lower cover plate 320 and the cylindrical body 31. In the illustrated example, a groove for accommodating the O-ring 102 is provided on the outer circumferential surface of the upper bearing 210, and a groove for accommodating the O-ring 102 is provided on the outer circumferential surface of the lower cover plate 320. It is to be understood, however, that the invention is not limited to the specific examples illustrated, but is capable of various modifications. For example, any other suitable sealing means other than an O-ring may be used. A hermetically sealed connection may be achieved between the bracket 230 or the lower bearing 310 and the housing 30. A recess for receiving the sealing means may be provided on the inner wall of the housing. In the illustrated example, the upper cover plate 220 and the bracket 230 are separately formed. However, it is understood that the upper cover plate 220 and the bracket 230 may be formed in one body.

As shown in fig. 3, the bracket 230 and the lower cover plate 320 are both welded to the cylindrical body 31 of the housing 30 to achieve a hermetically sealed connection at the weld 101. In an alternative embodiment, the upper bearing and/or the lower bearing may be welded to the housing to establish a hermetically sealed connection.

In one example, the space between the upper bearing and the lower bearing may be evacuated by a vacuum pump, thereby placing the compression mechanism in a vacuum environment, as shown in fig. 1. In this example, the

intake ducts

41 and 43 may be interference fit with the compression mechanism 10 to maintain a vacuum environment well. Referring to fig. 11, a through hole 328 may be provided in the lower cover plate 320 so that a vacuum is drawn through the through hole 328. As shown in fig. 1, 4, 12-14, a valve 327 may also be provided on the lower cover plate 320 to allow or prevent gas from passing through the through-holes 328.

In another example, the

intake conduits

41 and 43 may be clearance fit with the compression mechanism 10 to allow low temperature, low pressure gas from the intake conduits to enter the ambient environment of the compression mechanism to place the compression mechanism in a low pressure environment.

Additionally, as described above and shown, the lubricant passages of the various components of the compressor may allow high temperature, high pressure gas to pass through, thereby allowing the sump 20 to be in a high pressure environment (which may be referred to as a second pressure environment). The pressure in the high pressure environment or the second pressure environment is greater than the pressure in the low pressure environment or the first pressure environment. Preferably, the pressure in the high pressure environment or the second pressure environment may be substantially the discharge pressure (i.e., the pressure of the discharge gas). In this way, circulation and management of the lubricant is facilitated. In one example, lubricant passages of various components of the compression mechanism may be disposed proximate to the exhaust passage, thereby may facilitate reducing an amount of heat transfer between the high temperature exhaust and the low temperature intake.

In particular, the

lubricant passages

111 and 161 of the first and

second pump bodies

110 and 160 may allow high-pressure gas to pass therethrough, and thus may apply additional force to the first and

second vanes

130 and 180, thereby facilitating isolation of the intake and discharge chambers of the compression mechanism.

As described above, a spring 119 may be provided to provide a biasing force to the slide of the compression mechanism to tightly abut the slide against the piston. In the illustrated example, a hole 115 may be provided for receiving a spring 119. The aperture 115 may extend through the outer sidewall of the

pump body

110, 160 for ease of manufacture and assembly. In this case, a plug may be provided in the hole 115 to isolate the inside of the hole 115 from the outside, in order to prevent the high-pressure gas in the hole 115 from entering the low-pressure or vacuum environment around the compression mechanism. In the illustrated example, the cutout 118, the lubricant passage 111, and the hole 115 may form a slide receptacle. It should be appreciated that the slip receptacle may include only any set of the cutout 118, the lubricant channel 111, and the aperture 115. For example, the slide receptacle may include only the cutout 118, or may include the cutout 118 and the lubricant passage 111.

Referring to fig. 6, a cavity 218 may be provided in the upper bearing 210 to block heat transfer between the high temperature exhaust gas and the low temperature intake air within the first compression assembly. The cavity 218 may be covered by an upper cover plate 220. Additionally or alternatively, a cavity 318 may be provided in the lower bearing 310 to block heat transfer between the high temperature exhaust gas and the low temperature intake air within the second compression assembly. The cavity 318 may be covered by a lower cover plate 320. In some embodiments, communication channels (as indicated by arrows in FIG. 13) may also be provided in various components of the compression mechanism to communicate the

cavities

218, 318 with the low pressure or vacuum environment surrounding the compression mechanism. The parameters (e.g., number, size, shape, etc.) of the communication channels may be designed according to particular needs.

In another example, as shown in fig. 15, an annular groove 329 extending substantially in the radial direction may be provided on the outer circumferential surface of the lower cover plate 320. In further examples, the annular groove 329 may extend along a portion of the circumference of the lower cover plate 320. The annular groove 329 may extend continuously or intermittently. Preferably, the annular groove 329 may be disposed proximate to the compression mechanism. It should be appreciated that the annular groove 329 may be provided on other components of the compressor and/or at other suitable locations, so long as the annular groove 329 facilitates blocking heat transfer between the exhaust gas and the intake air.

In the example shown in fig. 15, a groove 326 for accommodating a sealing means (e.g., an O-ring) is further provided on the outer circumferential surface of the lower cover plate 320. In this case, the annular groove 329 may be closer to the compression mechanism 10 than the groove 326.

Although various embodiments of the present invention have been described in detail herein, it is to be understood that this invention is not limited to the particular embodiments described and illustrated in detail herein, and that other modifications and variations may be effected by one skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to be within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent components.

Claims

1. A rotary compressor comprising:

a housing (30);

a compression mechanism (10) disposed within the housing (30) and in a first pressure environment or vacuum environment, wherein a pressure in the first pressure environment is less than or equal to a suction pressure, the compression mechanism having a discharge passage disposed therein such that gas compressed by the compression mechanism is discharged via the discharge passage into a discharge space separate from the first pressure environment or vacuum environment; and

a sump (20) within the housing (30) and under a second pressure environment, wherein a pressure in the second pressure environment is greater than a pressure in the first pressure environment,

wherein the rotary compressor inlet duct (41, 43) is clearance fitted into the compression mechanism (10) to enable the compression mechanism (10) to be in the first pressure environment; or an air intake duct (41, 43) of the rotary compressor is interference-fitted to the compression mechanism (10) to enable the compression mechanism (10) to be in the vacuum environment.

2. The rotary compressor of claim 1, wherein the oil sump (20) is located at one side of the compression mechanism (10).

3. The rotary compressor of claim 2, further comprising a motor (50), the motor (50) being located within the housing (30) on an opposite side of the compression mechanism (10) from the sump (20) and being in the second pressure environment.

4. The rotary compressor of claim 3, further comprising a first support (200) and a second support (300) for supporting the compression mechanism (10), the first support (200) and the second support (300) being respectively located at both sides of the compression mechanism (10),

the first support (200) and the second support (300) are hermetically sealed in connection with the housing (30) so as to form the first pressure environment or vacuum environment between the first support (200) and the second support (300).

5. The rotary compressor of claim 4, wherein the first support (200) and/or the second support (300) are welded to the casing (30).

6. The rotary compressor of claim 4, wherein a sealing means is provided between the first support part (200) and the casing (30); and/or

A sealing device is provided between the second support (300) and the housing (30).

7. The rotary compressor of claim 6, wherein the sealing means is in the form of an O-ring.

8. The rotary compressor of claim 4, wherein a first cavity (218) is provided in the first support part (200); and/or

A second cavity (318) is provided in the second support (300).

9. The rotary compressor of claim 8, wherein the first cavity (218) and/or the second cavity (318) are in communication with the first pressure environment or vacuum environment around the compression mechanism (10) such that the first pressure environment or vacuum environment is within the first cavity (218) and/or the second cavity (318).

10. The rotary compressor of claim 9, wherein a communication channel is provided in the pump body of the compression mechanism, via which the first cavity (218) and/or the second cavity (318) communicate with the first pressure environment or vacuum environment around the compression mechanism (10).

11. The rotary compressor of claim 4, wherein a first annular groove extending substantially in a radial direction is provided on an outer circumferential surface of the first support part (200); and/or

A second annular groove (329) extending substantially in the radial direction is provided on the outer peripheral surface of the second support portion (300).

12. The rotary compressor of claim 11, wherein the first and/or second annular grooves (329) are positioned closer to the compression mechanism (10) relative to a hermetically sealed position.

13. The rotary compressor of claim 4, wherein the first support part (200) comprises a first bearing housing (210) and/or a first cover plate (220) and/or a bracket (230); and

the second support portion (300) includes a second bearing housing (310) and/or a second cover plate (320).

14. The rotary compressor of any one of claims 3 to 13, wherein the compression mechanism (10) includes a pump body, a piston moving within the pump body, and a vane abutting to the piston, the vane dividing a space between the piston and the pump body into a suction chamber and a discharge chamber;

a vane housing part (111, 118, 115) for housing the vane is provided in the pump body;

the slide receiving portion is in communication with the oil sump (20) and the second pressure environment of the motor (50).

15. The rotary compressor of claim 14, wherein a choke plug is provided in the vane housing to isolate the first pressure environment or vacuum environment around the compression mechanism (10) from an environment inside the vane housing.

16. The rotary compressor of any one of claims 4 to 13, wherein the compression mechanism (10) includes one or more lubricant passages (111, 151, 161; 112, 152, 162; 113, 153, 163) that allow lubricant to flow to the sump (20).

17. The rotary compressor of claim 16, wherein the lubricant passage is disposed adjacent to a discharge passage (114, 154, 164) in the compression mechanism (10).

18. The rotary compressor of claim 16, wherein one of the first and second supports (200, 300) adjacent to the motor has an oil sump (219) provided therein, the oil sump communicating with the lubricant passage.

19. The rotary compressor of any one of claims 4 to 13, wherein a valve (327) for allowing or preventing gas from passing through to maintain the first pressure environment or vacuum environment is provided on the first support part (200) and/or the second support part (300).

20. The rotary compressor of any one of claims 1 to 13, wherein the compression mechanism (10) is a single cylinder rotor type compression mechanism or a multi-cylinder rotor type compression mechanism.

21. The rotary compressor of any one of claims 1 to 13, wherein the pressure in the second pressure environment is substantially discharge pressure.

22. A rotary compressor comprising:

a housing (30);

a compression mechanism (10), the compression mechanism (10) disposed within the housing (30); and

a first support (200) and/or a second support (300), the first support (200) and/or the second support (300) being configured to support the compression mechanism (10) and to place the compression mechanism in a pressure environment or a vacuum environment that is less than or equal to a suction pressure,

wherein cavities (218, 318) for blocking heat transfer from high temperature exhaust gas to low temperature intake gas are provided in the first support (200) and/or the second support (300), the cavities being configured to communicate with the pressure environment or vacuum environment.

23. The rotary compressor of claim 22, wherein a radially extending annular groove (329) is provided on at least a portion of an outer circumferential surface of the first support part (200) and/or the second support part (300).

24. The rotary compressor of claim 23, wherein the annular groove (329) extends continuously or discontinuously.

25. The rotary compressor of claim 23, wherein the first support (200) and/or the second support (300) are hermetically and sealingly connected to the casing.

26. The rotary compressor of claim 25, wherein the annular groove (329) is located closer to the compression mechanism (10) than to a hermetically sealed position.

27. The rotary compressor of claim 26, wherein the first support (200) and/or the second support (300) are welded to the casing; or

Sealing means are provided between the first support (200) and/or the second support (300) and the housing.

28. A rotary compressor comprises a compression mechanism under a first pressure environment or a vacuum environment, wherein the compression mechanism comprises a pump body, a piston moving in the pump body and a slide sheet abutted to the piston,

a sliding sheet accommodating part for accommodating the sliding sheet is arranged in the pump body;

the slip sheet receiving part is communicated with a space containing high-pressure exhaust gas so as to be in a second pressure environment, wherein the pressure in the second pressure environment is higher than that in the first pressure environment,

an inlet duct (41, 43) of the rotary compressor is clearance fitted into the compression mechanism (10) to enable the compression mechanism (10) to be in the first pressure environment; or an air intake duct (41, 43) of the rotary compressor is interference-fitted to the compression mechanism (10) to enable the compression mechanism (10) to be in the vacuum environment.

29. The rotary compressor of claim 28, wherein the vane receptacle is configured to also communicate with a lubricant passage.