CN115342060A - Rotary compressor - Google Patents

Abstract

The invention discloses a rotary compressor, which comprises a shell assembly, a motor assembly and a pump body assembly, wherein the shell assembly comprises an upper shell, a main shell and a lower shell, the upper shell and the lower shell are respectively connected to two ends of the main shell and enclose an installation cavity, the main shell is provided with at least one cavity, the cavity is positioned on the outer side of the installation cavity, and damping materials are filled in the cavity; the motor assembly is positioned in the mounting cavity and connected with the main shell; the pump body assembly is located in the mounting cavity and is connected to the main housing. The rotary compressor is in operation, and motor element and pump body subassembly's vibration transmits to the main casing body, because the main casing body has the cavity to it has damping material to fill in the cavity, utilizes damping material can effectively attenuate the vibration of the main casing body, reduces the main casing body to the noise of external radiation, reduces rotary compressor's operating noise.

Description

Rotary compressor

Technical Field

The invention relates to the technical field of compressors, in particular to a rotary compressor.

Background

In the related art, a pump assembly of a rotary compressor is driven by a motor assembly and has a periodic suction-compression-discharge characteristic, and vibration of the pump assembly and the motor assembly is transmitted to a casing, so that the casing vibrates and noise is radiated to the outside, resulting in a high operating noise of the rotary compressor, which is to be improved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a rotary compressor, which can improve the vibration of a shell, thereby reducing the working noise of the rotary compressor.

The rotary compressor comprises a shell assembly, a motor assembly and a pump body assembly, wherein the shell assembly comprises an upper shell, a main shell and a lower shell, the upper shell and the lower shell are respectively connected to two ends of the main shell and enclose a mounting cavity, the main shell is provided with at least one cavity, the cavity is positioned on the outer side of the mounting cavity, and damping materials are filled in the cavity; the motor assembly is positioned in the mounting cavity and is connected with the main shell; the pump body assembly is located in the mounting cavity and connected with the main shell.

The rotary compressor according to the embodiment of the invention has at least the following beneficial effects: the rotary compressor is in operation, and motor element and pump body subassembly's vibration transmits to the main casing body, because the main casing body has the cavity to it has damping material to fill in the cavity, utilizes damping material can effectively attenuate the vibration of the main casing body, reduces the main casing body to the noise of external radiation, reduces rotary compressor's operating noise.

According to some embodiments of the invention, the main housing has a plurality of the cavities, and the plurality of the cavities are distributed in two groups along an axial direction of the main housing.

According to some embodiments of the invention, both end faces of the main housing are provided with openings communicating with the cavity.

According to some embodiments of the invention, the main housing has a plurality of said cavities, and the plurality of said cavities are spaced apart along the circumference of the main housing.

According to some embodiments of the invention, the main housing is provided with a plurality of mounting columns, and the plurality of cavities and the plurality of mounting columns are distributed in a staggered manner along the circumferential direction of the main housing.

According to some embodiments of the invention, the angle occupied by each of the cavities is equal in the circumferential direction of the main housing.

According to some embodiments of the invention, the main housing is provided with eight circumferentially equispaced mounting posts, and at least one cavity is arranged between two adjacent mounting posts.

According to some embodiments of the invention, the upper housing and the lower housing are connected to the mounting post by fasteners, and metal sealing rings are disposed between the upper housing and the main housing and between the lower housing and the main housing.

According to some embodiments of the invention, the damping material is a damping particle, the cavity is filled with a plurality of damping particles, and the plurality of damping particles have the same external dimension or have various specifications.

According to some embodiments of the invention, the filling rate of the dampening particles in the cavities is 60% to 90%.

According to some embodiments of the invention, the inner wall of the main housing is provided with a radially projecting mounting ring to which the pump body assembly is attached by fasteners.

According to some embodiments of the present invention, the inner wall of the main housing is provided with a mounting groove in which the motor assembly is mounted; or the motor assembly is connected to the mounting ring by a fastener.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged partial view taken at B in FIG. 1;

FIG. 4 is a schematic structural diagram of a main housing according to an embodiment of the present invention;

FIG. 5 is a top view of the main housing in an embodiment of the present invention;

fig. 6 is a cross-sectional view of the main housing in an embodiment of the present invention.

The reference numbers are as follows:

the structure comprises a shell assembly 100, a mounting cavity 101, a cavity 102, an upper shell 110, a main shell 120, a mounting ring 121, a mounting groove 122, a lower shell 130, a mounting seat 140, a connecting seat 150 and a mounting column 160;

a motor assembly 200;

the pump body assembly 300, a cylinder 310, a compression cavity 311, a piston 320 and a rotating shaft 330;

a damping material 400;

a liquid storage tank 500, a connecting pipe 510, a sleeve 520, a fixing ring 530, a fastening bolt 540 and a sealing member 550.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The rotary compressor is a compressor widely applied to refrigeration equipment at present, and a motor of the rotary compressor directly drives a piston to rotate to complete compression of a refrigerant without converting the rotating motion of a rotor into reciprocating motion of the piston. The rotary compressor is more suitable for small-sized refrigeration equipment, and is widely applied to household air conditioners in particular.

In the related art, a motor assembly and a pump assembly of the rotary compressor are directly mounted on the inner wall of a shell, and vibration generated by the motor assembly and the pump assembly is transmitted to the shell, so that the shell vibrates and radiates noise to the outside, and the working noise of the compressor is larger and needs to be improved.

As shown in fig. 1 to 6, an embodiment of the present invention provides a rotary compressor, which can improve vibration of a casing and reduce radiation noise to the outside.

The rotary compressor comprises a shell component 100, a motor component 200, a pump body component 300 and a liquid storage tank 500, wherein the shell component 100 is provided with a mounting cavity 101, the motor component 200 and the pump body component 300 are both arranged in the mounting cavity 101, the pump body component 300 comprises a cylinder 310, a piston 320 and a rotating shaft 330, the cylinder 310 is provided with a compression cavity 311, the piston 320 is fixedly connected to one end of the rotating shaft 330 and eccentrically arranged in the compression cavity 311, the motor component 200 is used for driving the rotating shaft 330 to rotate, and a connecting pipe 510 of the liquid storage tank 500 is communicated with an air suction port of the cylinder 310. When the rotary compressor is operated, the motor assembly 200 drives the rotating shaft 330 to rotate, and the rotating shaft 330 drives the piston 320 to eccentrically rotate in the compression cavity 311, thereby completing the continuous operations of air suction, compression and exhaust, so that the rotary compressor can output high-pressure refrigerant gas.

The housing assembly 100 includes an upper housing 110, a main housing 120, and a lower housing 130, wherein the upper housing 110 and the lower housing 130 are respectively connected to two ends of the main housing 120, and the upper housing 110, the main housing 120, and the lower housing 130 enclose an installation cavity 101, so as to conveniently install the electric motor assembly 200 and the pump body assembly 300.

It can be understood that, in the operation of the rotary compressor, there are vibrations of both the motor assembly 200 and the pump body assembly 300, which are transmitted to the housing assembly 100 and radiate noise to the outside. In order to improve the operation noise of the rotary compressor, at least one cavity 102 is formed inside the main casing 120, the cavity 102 is distributed outside the installation cavity 101, and the cavity 102 is filled with a damping material 400.

The damping material 400 can be damping particles, and when the rotary compressor is in operation, the vibration of the motor assembly 200 and the pump body assembly 300 is transmitted to the main housing 120, so that the damping particles in the cavity 102 are excited, the damping particles move in the cavity 102, and collide with each other and the inner wall of the cavity 102, so that the vibration of the main housing 120 can be effectively attenuated, and the noise radiated to the outside by the main housing 120 is reduced; in addition, the noise of the motor assembly 200 and the pump body assembly 300 is transmitted to the main housing 120, the noise can be effectively weakened through the cavity 102 and the damping particles therein, the working noise of the rotary compressor is reduced, the user experience of the refrigeration equipment using the rotary compressor is promoted, and the product competitiveness is promoted. Of course, the damping material 400 may be a rubber damping plate, a plastic damping plate or a foam material.

It will be appreciated that the main housing 120 is cylindrical in shape and that the propagation of vibrations and noise is divergent in the radial direction of the main housing 120, so that the distribution of the cavities 102 is preferably such as to surround the mounting chamber 101. For example, if only one cavity 102 is provided, the cavity 102 is cylindrical and surrounds the mounting cavity 101, that is, the main housing 120 is composed of two cylindrical parts, a cylindrical cavity 102 is formed between the two cylindrical parts, the two cylindrical parts are fixed by the upper housing 110 and the lower housing 130 and define the cavity 102, the cavity 102 is filled with the damping material 400, and the damping material 400 is also distributed in a cylindrical shape and surrounds the mounting cavity 101, so that the damping material can play a role in damping vibration and noise in all directions.

Alternatively, the main housing 120 is provided with a plurality of cavities 102, the cavities 102 are distributed around the mounting cavity 101, and the cavities 102 preferably cover more space as much as possible, so as to achieve a greater vibration and noise damping effect. The distribution of the cavities 102 is determined according to the structure of the main housing 120 and other components of the rotary compressor, and may be a regular distribution or an irregular distribution.

Referring to fig. 6, the main housing 120 is provided with at least two cavities 102, and the at least two cavities 102 are distributed in two groups along the axial direction of the main housing 120. It will be appreciated that the separation between the two sets of cavities 102 is advantageous to improve the structural strength of the main housing 120, and that the main housing 120 is an integral component that is advantageous to damp vibrations by damping the active impact of particles.

It should be understood that each cavity may include only one cavity 102, or each cavity may include a plurality of cavities 102, and the shape of the cavities 102 may be uniform, or a plurality of shapes of cavities 102 may be used, or any combination thereof.

Referring to fig. 6, it should be understood that openings communicating with the cavity 102 are formed at both end surfaces of the main housing 120, through which the damping material 400 is filled into the cavity 102, and the damping material 400 is defined by closing the openings by the upper and lower housings 110 and 130. In addition, the openings are formed at both end surfaces of the main housing 120, and the openings are now consistent with the cross section of the main housing 120, so that the demolding operation of the cast molding is facilitated, the manufacturing cost of the main housing 120 is reduced, and the product consistency of the main housing 120 is improved.

Of course, the opening may be provided in the outer wall surface of the main casing 120, and the opening may be closed by a cover plate fixed to the main casing 120, or the cover plate may be fixed using a fastener or may be sealed and welded to the main casing 120.

Referring to fig. 5, it should be understood that the plurality of cavities 102 are distributed at intervals along the circumferential direction of the main casing 120, wherein the circumferential direction is preferably uniformly distributed, the plurality of cavities 102 are regularly distributed in the circumferential direction of the main casing 120, and the vibration reduction and noise reduction effects at various positions in the circumferential direction are uniform, which is beneficial to reducing the operating noise of the rotary compressor.

The plurality of cavities 102 may also be non-uniformly distributed around the circumference of the main housing 120. As shown in fig. 1 and 4, the outer wall of the main housing 120 is provided with the mounting seat 140 for connecting the liquid storage tank 500 and the connecting seat 150 for connecting the connecting pipe 510, and since the wall thickness of the position where the mounting seat 140 and the connecting seat 150 are located is increased, the cavity 102 can avoid the position where the mounting seat 140 and the connecting seat 150 are located, which is not only beneficial to manufacturing the main housing 120, but also can reduce the influence on the vibration reduction and noise reduction effect as much as possible.

Referring to fig. 5, it can be understood that the main housing 120 is provided with a plurality of mounting posts 160, the mounting posts 160 are arranged along the axial direction of the main housing 120, and the plurality of cavities 102 and the plurality of mounting posts 160 are distributed in a staggered manner in the circumferential direction of the main housing 120. On one hand, the mounting posts 160 separate the cavities 102, and meanwhile, the mounting posts 160 form part of the inner wall of the cavities 102, on the other hand, the mounting posts 160 increase the structural strength of the main housing 120, and the mounting posts 160 are circumferentially distributed at intervals, so that the structural strength of each position of the main housing 120 is more balanced, and the reduction of the working noise of the rotary compressor is facilitated.

It is understood that the plurality of cavities 102 and the plurality of mounting posts 160 are not limited to be staggered in a one-to-one correspondence, and two cavities 102 may be disposed between two mounting posts 160, or distributed in irregular numbers.

Referring to fig. 4 and 5, it can be understood that the main casing 120 is provided with eight mounting posts 160, the eight mounting posts 160 are uniformly distributed along the circumferential direction of the main casing 120, at least one cavity 102 is arranged between two adjacent mounting posts 160, that is, the plurality of cavities 102 are divided into eight rows, and the cavity 102 and the damping material 400 are arranged between any two adjacent mounting posts 160, so that the transmission of vibration and noise can be effectively damped, and the operating noise of the rotary compressor can be reduced.

Referring to fig. 5 and 6, the cavities 102 are divided into eight rows in the circumferential direction and two groups in the axial direction, which is beneficial to demolding and cost reduction in the casting and molding of the main housing 120, and the cavities 102 are regularly distributed, so that the transmission of vibration and noise can be effectively attenuated, and the working noise of the rotary compressor can be reduced. It will be appreciated that the division of each row of cavities 102 in the axial direction may be uniform or may be different, and may be set according to the shape of the main housing 120 and the requirements of the mating assembly.

Referring to fig. 1, the mounting post 160 serves as a mounting structure for both the upper housing 110 and the lower housing 130, the upper housing 110 and the lower housing 130 are connected to the mounting post 160 by a fastener, a metal seal ring is used between the upper housing 110 and the main housing 120, and a metal seal ring is also used between the lower housing 130 and the main housing 120. The fastening member may be a bolt, a threaded hole is formed in an end surface of the mounting post 160, the upper casing 110 and the lower casing 130 are provided with through holes corresponding to the threaded holes, and the bolt passes through the through hole and then is screwed into the threaded hole, so as to fix the upper casing 110 and the lower casing 130 to the main casing 120, and a metal sealing ring is used to realize sealing, thereby preventing the leakage of the refrigerant in the mounting cavity 101. Considering that the upper housing 110, the main housing 120 and the lower housing 130 are all rigid metal parts, and the inside of the housing assembly 100 has a refrigerant with a large pressure, the metal sealing ring can bear a large locking force, so that the sealing performance is improved, and the refrigerant leakage is prevented. The fastener can also adopt rivets, pins and the like, and the requirement of fixed connection is met.

Referring to fig. 5, it can be understood that, in the circumferential direction of the main casing 120, each cavity 102 is in a sector shape corresponding to the axis of the main casing 120, and the sectors of each cavity 102 occupy equal angles, that is, the cavities 102 have the same size in the circumferential direction of the main casing 120, and are both uniformly distributed in the circumferential direction and the uniform size in the circumferential direction, and the vibration damping and noise reduction effects at various positions on the circumference of the main casing 120 are uniform, which is beneficial to reducing the operating noise of the rotary compressor.

Referring to fig. 1 and 2, it can be understood that the damping material 400 is damping particles, and each cavity 102 is filled with a plurality of damping particles, and the plurality of damping particles have a uniform external dimension, so that when the vibration of the motor assembly 200 and the pump body assembly 300 is transmitted to the main housing 120, the damping particles are driven to move in the cavities 102, so as to collide with each other or the inner wall of the cavity 102, thereby reducing the transmission of the vibration to the outer wall of the main housing 120 and reducing the outward radiation noise of the main housing 120.

Alternatively, the plurality of damping particles may have external dimensions of various specifications, and when the vibration of the motor assembly 200 and the pump body assembly 300 is transmitted to the main housing 120, the damping particles are caused to move in the cavity 102, so as to collide with each other or with the inner wall of the cavity 102, thereby reducing the transmission of the vibration to the outer wall of the main housing 120 and reducing the outward radiation noise of the main housing 120. The damping particles with various specifications move more disorderly, and the transmission of vibration is effectively attenuated.

It should be understood that the damping particles may be metal particles, non-metal particles, or a mixture of multiple particles. The filling rate of the damping particles in each cavity 102 is 60% to 90%, that is, the volume of the damping particles occupies 60% to 90% of the cavity 102, and a part of space is reserved for the damping particles to move, wherein the filling rate of 90% is preferred, so that the space requirement of mutual collision of the damping particles can be met, the damping particles can be filled as much as possible, and good vibration reduction and noise reduction effects can be achieved.

Referring to fig. 1 and 2, it can be understood that the inner wall of the main housing 120 is provided with a radially protruding mounting ring 121, the pump body assembly 300 is connected to the mounting ring 121 by fasteners, and the mounting ring 121 is located above the pump body assembly 300. Considering that a through hole needs to be formed in the middle of the mounting ring 121 for the rotating shaft 330 of the pump body assembly 300 to pass through, the mounting ring 121 is attached to the inner wall of the main housing 120, and a plurality of circumferentially distributed fasteners are used to fix the cylinder 310 of the pump body assembly 300, so as to avoid interference with the rotating shaft 330. Moreover, the stress of the connection of the mounting ring 121 and the air cylinder 310 is more balanced, and the structure is reliable.

It can be understood that the fastener adopts the bolt, sets up the screw hole at the lower terminal surface of collar 121, and the periphery of cylinder 310 sets up the through-hole corresponding to the screw hole, and the bolt passes the through-hole and screws into the screw hole again and can fix cylinder 310, simple structure, easy dismounting.

Referring to fig. 1 and 2, it can be understood that a mounting groove 122 is further disposed on the inner wall of the main housing 120, the motor element 200 is mounted in the mounting groove 122, and the peripheral walls of the motor element 200 and the mounting groove 122 may be in an interference fit, so that the motor element 200 and the mounting groove 122 are fixed by the interference fit, and at the same time, a gap is eliminated, and the motor element 200 is prevented from colliding with the main housing 120 to generate noise during operation. Alternatively, the motor assembly 200 is first installed in the installation groove 122, and then the motor assembly 200 is fixed by a fastening member such as a bolt.

Considering that the motor assembly 200 is installed into the installation cavity 101 from the upper end of the main housing 120, the installation groove 122 is both an installation structure of the motor assembly 200 and a support structure of the motor assembly 200, accurately defines the axial position of the motor assembly 200, and improves the reliability of the rotary compressor.

Of course, the motor assembly 200 may also be fixed to the mounting ring 121, and the motor assembly 200 is also fixed to the mounting ring 121 by a fastener, so that the height dimension of the mounting ring 121 in the axial direction of the main housing 120 may be increased, and the structural strength may be improved, so as to fixedly support the motor assembly 200 and the pump body assembly 300 at the same time.

It is understood that the main housing 120 is a unitary structural member made of cast aluminum, and the connecting tube 510 is made of cast iron, and cannot be fixedly connected by welding. Connecting seat 150 is provided with the air inlet that link up in order to communicate installation cavity 101, and the outer wall cover of connecting pipe 510 is equipped with sleeve pipe 520, and the outer wall cover of sleeve pipe 520 is equipped with solid fixed ring 530, and solid fixed ring 530 is fixed in connecting seat 150 through a plurality of fastening bolt 540, and sleeve pipe 520 passes the air inlet and inserts the induction port of cylinder 310, and a plurality of fastening bolt 540 are along the circumference interval distribution of connecting pipe 510, and the atress is balanced, and the structure is firm reliable.

In the assembling process of the rotary compressor, the fixing ring 530 is firstly sleeved on the sleeve 520 and is welded and fixed, the sleeve 520 is sleeved on the connecting pipe 510 and is welded and fixed, then the sleeve 520 is inserted into the air inlet, and finally the fixing ring 530 is fixed on the connecting seat 150 by using the plurality of fastening bolts 540, so that the fixed connection between the connecting pipe 310 and the main shell 120 is realized, the connecting mode is simple and reliable, and the reliability of the connection can be effectively ensured even if the main shell 120 and the connecting pipe 510 are made of different materials.

In consideration of the requirement of sealing performance, a sealing member 550 is disposed between the fixing ring 530 and the connection base 150 to seal the fixing ring 530 and the connection base 150, and effectively prevent the refrigerant from leaking from a gap between the fixing ring 330 and the connection base 150. It should be understood that the fixing ring 530 is sealed with the sleeve 520 by welding, the weld is ring-shaped and closes a gap between the fixing ring 530 and the sleeve 520, the sleeve 520 is sealed with the connection pipe 510 by welding, the weld is ring-shaped and closes a gap between the sleeve 520 and the connection pipe 510, and the sealing of the connection of the fixing ring 530 and the connection seat 150 is achieved by the sealing member 550, substantially eliminating the risk of leakage.

It should be noted that, the sealing member 550 may be a sealing ring or a sealing gasket, and in the assembling process, the sleeve 520, the fixing ring 530 and the connecting pipe 510 are welded together, and after cooling, the fixing ring 530 is fixed on the connecting seat 150 by the fastening bolt 540, so that the sealing member 550 is effectively prevented from being damaged by the residual heat after welding.

Sealing member 550 can adopt O type sealing ring, is formed with the mounting groove between solid fixed ring 530 and the connecting seat 150 in order to supply to inject O type sealing ring, and the mounting groove can be the terminal surface that sets up at solid fixed ring 530 alone, also can set up the terminal surface at connecting seat 150 alone, can also be that the terminal surface of solid fixed ring 530 and the terminal surface of connecting seat 150 respectively set up half the mounting groove, and the cross-section of mounting groove slightly is less than the cross-section of O type sealing ring. The fixing ring 530 is matched with the connecting seat 150 to clamp the O-shaped sealing ring, and the O-shaped sealing ring deforms to realize sealing, so that refrigerant leakage is prevented. The O-ring is positioned inside the fastening bolts 540, and is not affected by the fastening bolts 540, thereby improving the reliability of sealing.

The sealing member 550 may also be a sealing gasket, which is clamped by the fixing ring 530 and the connecting seat 150, and the sealing is achieved by deformation of the sealing gasket, so as to prevent the refrigerant from leaking. The gasket is simultaneously provided with the through-hole for fastening bolt 540 to pass, therefore, the gasket realizes the peripheral sealed to fastening bolt 540 simultaneously on realizing that solid fixed ring 530 and connecting seat 150 are sealed the basis, further reduces the leakage risk.

It will be appreciated that the gasket may be a non-asbestos gasket, a rubber gasket, or the like, and that the gasket has a certain elasticity and is capable of deforming to meet non-sealing requirements. Meanwhile, the sealing gasket can also absorb the assembly error between the end surface of the fixing ring 530 and the end surface of the connecting seat 150, so that the manufacturing precision and the assembly precision of the fixing ring 530 and the connecting seat 150 are reduced, and the production cost is favorably reduced.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (12)

1. A rotary compressor, comprising:

the shell assembly comprises an upper shell, a main shell and a lower shell, wherein the upper shell and the lower shell are respectively connected to two ends of the main shell and enclose an installation cavity;

a motor assembly located in the mounting cavity and connected to the main housing;

a pump body assembly located in the mounting cavity and connected to the main housing.

2. The rotary compressor of claim 1, wherein the main housing has a plurality of the cavities, and the plurality of the cavities are distributed in two groups along an axial direction of the main housing.

3. The rotary compressor of claim 1 or 2, wherein both end surfaces of the main housing are provided with openings communicating with the cavity.

4. The rotary compressor of claim 1, wherein the main housing has a plurality of the cavities, and the plurality of the cavities are spaced apart along a circumference of the main housing.

5. The rotary compressor of claim 4, wherein the main housing is provided with a plurality of mounting posts, and the plurality of cavities and the plurality of mounting posts are staggered along a circumferential direction of the main housing.

6. The rotary compressor of claim 4 or 5, wherein each of the cavities occupies an equal angle in a circumferential direction of the main casing.

7. The rotary compressor of claim 5, wherein the main housing is provided with eight circumferentially spaced mounting posts, and at least one of the cavities is disposed between two adjacent mounting posts.

8. The rotary compressor of claim 7, wherein the upper housing and the lower housing are coupled to the mounting post by fasteners, and wherein metal sealing rings are disposed between the upper housing and the main housing and between the lower housing and the main housing.

9. The rotary compressor of claim 1, wherein the damping material is damping particles, the cavity is filled with a plurality of the damping particles, and the plurality of the damping particles have the same external dimensions or have various specifications.

10. The rotary compressor of claim 9, wherein a filling rate of the damping particles in the cavity is 60% to 90%.

11. The rotary compressor of claim 1, wherein the inner wall of the main housing is provided with a radially protruding mounting ring, the pump body assembly being connected to the mounting ring by fasteners.

12. The rotary compressor of claim 11, wherein the inner wall of the main housing is provided with a mounting groove, and the motor assembly is mounted in the mounting groove; or the motor assembly is connected to the mounting ring by a fastener.

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