Rotary compressor

Abstract

The present invention discloses a rotary compressor, which comprises a housing assembly, a motor assembly and a pump body assembly. The housing assembly includes an upper housing, a main housing and a lower housing. The upper housing and the lower housing are respectively connected to two ends of the main housing and enclose an installation cavity. The main housing is provided with at least one cavity, and the cavity is located outside the installation cavity, and a damping material is filled in the cavity; the motor assembly is located in the installation cavity and connected to the main housing; the pump body assembly is located in the installation cavity and connected to the main housing. During the operation of the rotary compressor, the vibrations of the motor assembly and the pump body assembly are transmitted to the main housing. Since the main housing has a cavity and a damping material is filled in the cavity, the damping material can effectively attenuate the vibration of the main housing, reduce the noise radiated by the main housing to the outside, and reduce the working noise of the rotary compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly relates to a rotary compressor. Background Art

[0002] In the related art, the pump body assembly of a rotary compressor is driven by a motor assembly and has periodic suction-compression-exhaust characteristics. The vibrations of the pump body assembly and the motor assembly are transmitted to the housing, causing the housing to vibrate and radiate noise to the outside, resulting in a relatively high operating noise of the rotary compressor, which needs to be improved. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a rotary compressor that can improve the vibration of the housing and thus reduce the operating noise of the rotary compressor.

[0004] The rotary compressor according to an embodiment of the present invention includes a housing assembly, a motor assembly, and a pump body assembly. The housing assembly includes an upper housing, a main housing, and a lower housing. The upper housing and the lower housing are respectively connected to two ends of the main housing and enclose an installation cavity. The main housing is provided with at least one cavity, and the cavity is located outside the installation cavity. The cavity is filled with a damping material; the motor assembly is located in the installation cavity and is connected to the main housing; the pump body assembly is located in the installation cavity and is connected to the main housing.

[0005] The rotary compressor according to an embodiment of the present invention has at least the following beneficial effects: During the operation of the rotary compressor, the vibrations of the motor assembly and the pump body assembly are transmitted to the main housing. Since the main housing has a cavity and the cavity is filled with a damping material, the damping material can effectively attenuate the vibration of the main housing, reduce the noise radiated by the main housing to the outside, and reduce the operating noise of the rotary compressor.

[0006] According to some embodiments of the present invention, the main housing has a plurality of the cavities, and along the axial direction of the main housing, the plurality of cavities are distributed in two groups.

[0007] According to some embodiments of the present invention, both end faces of the main housing are provided with openings communicating with the cavities.

[0008] According to some embodiments of the present invention, the main housing has a plurality of the cavities, and along the circumferential direction of the main housing, the plurality of cavities are spaced apart.

[0009] According to some embodiments of the present invention, the main housing is provided with a plurality of mounting posts, and along the circumferential direction of the main housing, the plurality of cavities and the plurality of mounting posts are staggered.

[0010] According to some embodiments of the present invention, in the circumferential direction of the main housing, each of the cavities occupies an equal angle.

[0011] According to some embodiments of the present invention, the main housing is provided with eight circumferentially evenly distributed mounting posts, and at least one of the cavities is arranged between two adjacent mounting posts.

[0012] According to some embodiments of the present invention, the upper housing and the lower housing are connected to the mounting posts by fasteners, and metal sealing rings are provided between the upper housing and the main housing and between the lower housing and the main housing.

[0013] According to some embodiments of the present invention, the damping material is damping particles, and a plurality of the damping particles are filled in the cavities, and the external dimensions of the plurality of damping particles are the same or have multiple specifications.

[0014] According to some embodiments of the present invention, the filling rate of the damping particles in the cavities is 60% to 90%.

[0015] According to some embodiments of the present invention, a radially protruding mounting ring is provided on the inner wall of the main housing, and the pump body assembly is connected to the mounting ring by fasteners.

[0016] According to some embodiments of the present invention, a mounting groove is provided on the inner wall of the main housing, and the motor assembly is installed in the mounting groove; or the motor assembly is connected to the mounting ring by fasteners.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Additional aspects and advantages of the present invention will become apparent and be readily understood in conjunction with the description of the embodiments with reference to the following drawings, in which:

[0019] Figure 1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 a partial enlarged view of part A in

[0021] Figure 3 is Figure 1 a partial enlarged view of part B in

[0022] Figure 4 is a schematic structural view of the main housing according to an embodiment of the present invention;

[0023] Figure 5 is a top view of the main housing according to an embodiment of the present invention;

[0024] Figure 6 This is a cross-sectional view of the main housing in the embodiments of the present invention.

[0025] The reference numerals in the attached drawings are as follows:

[0026] Housing assembly 100, installation cavity 101, cavity 102, upper housing 110, main housing 120, mounting ring 121, mounting groove 122, lower housing 130, mounting seat 140, connecting seat 150, mounting post 160;

[0027] Motor assembly 200;

[0028] Pump body assembly 300, cylinder 310, compression chamber 311, piston 320, rotating shaft 330;

[0029] Damping material 400;

[0030] Liquid storage tank 500, connecting pipe 510, sleeve 520, fixing ring 530, fastening bolt 540, seal 550. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the attached drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the attached drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, it should be understood that the orientation descriptions such as up, down, front, back, left, right, etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0035] A rotary compressor is a type of compressor currently widely used in refrigeration equipment. The motor of the rotary compressor does not need to convert the rotary motion of the rotor into the reciprocating motion of the piston, but directly drives the piston to perform a rotary motion to complete the compression of the refrigerant. The rotary compressor is more suitable for small refrigeration equipment, especially widely used in household air conditioners.

[0036] In the related art, the motor assembly and the pump body assembly of the rotary compressor are directly installed on the inner wall of the housing. The vibrations generated by the motor assembly and the pump body assembly are transmitted to the housing, causing the housing to vibrate and radiate noise to the outside, resulting in a relatively large operating noise of the compressor, which needs to be improved.

[0037] As Figures 1 to 6 shown, an embodiment of the present invention provides a rotary compressor, which can improve the vibration of the housing and reduce the noise radiated to the outside.

[0038] The rotary compressor includes a housing assembly 100, a motor assembly 200, a pump body assembly 300 and a liquid storage tank 500. The housing assembly 100 has an installation cavity 101. The motor assembly 200 and the pump body assembly 300 are both arranged in the installation cavity 101. The pump body assembly 300 includes a cylinder 310, a piston 320 and a rotating shaft 330. The cylinder 310 has a compression cavity 311. The piston 320 is fixedly connected to one end of the rotating shaft 330 and is eccentrically arranged in the compression cavity 311. The motor assembly 200 is used to drive the rotating shaft 330 to rotate. The connecting pipe 510 of the liquid storage tank 500 communicates with the suction port of the cylinder 310. When the rotary compressor operates, the motor assembly 200 drives the rotating shaft 330 to rotate, and the rotating shaft 330 drives the piston 320 to rotate eccentrically in the compression cavity 311, thereby completing the continuous operations of suction, compression and exhaust. Therefore, the rotary compressor can output high-pressure refrigerant gas.

[0039] Among them, the housing assembly 100 includes an upper housing 110, a main housing 120 and a lower housing 130. The upper housing 110 and the lower housing 130 are respectively connected to both ends of the main housing 120. The upper housing 110, the main housing 120 and the lower housing 130 enclose the installation cavity 101 to facilitate the assembly of the motor assembly 200 and the pump body assembly 300.

[0040] It can be understood that during the operation of the rotary compressor, both the motor assembly 200 and the pump body assembly 300 vibrate. The vibrations are transmitted to the housing assembly 100 and radiate noise to the outside. In order to improve the operating noise of the rotary compressor, at least one cavity 102 is formed inside the main housing 120. The cavity 102 is distributed outside the installation cavity 101, and a damping material 400 is filled in the cavity 102.

[0041] The damping material 400 can adopt damping particles. During the operation of the rotary compressor, the vibrations of the motor assembly 200 and the pump body assembly 300 are transmitted to the main housing 120, thereby exciting the damping particles in the cavity 102. The damping particles move in the cavity 102, 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 from the main housing 120 to the outside can be reduced. In addition, the noise of the motor assembly 200 and the pump body assembly 300 is transmitted to the main housing 120, and the cavity 102 and the damping particles therein can effectively weaken the noise, reduce the operating noise of the rotary compressor, which is beneficial to improving the user experience of the refrigeration equipment using the rotary compressor and enhancing the product competitiveness. Of course, the damping material 400 can also adopt rubber damping plates, plastic damping plates or foamed plastics.

[0042] It can be understood that the shape of the main housing 120 is cylindrical, and the propagation of vibration and noise diverges radially along the main housing 120. Therefore, it is better that the cavities 102 are distributed to surround the installation cavity 101. For example, if only one cavity 102 is provided, the cavity 102 is cylindrical and surrounds the installation cavity 101, that is, the main housing 120 is composed of two cylindrical parts, and 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 the cavity 102 is defined. The damping material 400 is filled in the cavity 102, and the damping material 400 is also distributed in a cylindrical shape and surrounds the installation cavity 101, which can attenuate vibration and noise in all directions.

[0043] Alternatively, the main housing 120 is provided with a plurality of cavities 102, and the plurality of cavities 102 are distributed around the installation cavity 101. It is better that the plurality of cavities 102 cover as much space as possible, which can play a greater role in attenuating vibration and noise. The distribution of the plurality of cavities 102 is set according to the structure of the main housing 120 and other components of the rotary compressor, and can be a regular distribution method or an irregular distribution method.

[0044] Refer to Figure 6 , the main housing 120 is provided with at least two cavities 102, and along the axial direction of the main housing 120, the at least two cavities 102 are distributed in two groups. It can be understood that the partition structure between the two groups of cavities 102 is beneficial to improving the structural strength of the main housing 120, and the main housing 120 is an integral component, which is beneficial to attenuating vibration through the active collision of the damping particles.

[0045] It should be understood that each group of cavities can include only one cavity 102, or each group of cavities can include a plurality of cavities 102. The shapes of the cavities 102 can be the same, or a variety of shapes of cavities 102 can be adopted, with any combination.

[0046] Refer to Figure 6It should be understood that both end surfaces of the main housing 120 are provided with openings connected to the cavity 102, through which the damping material 400 can be easily filled into the cavity 102, and the damping material 400 can be confined by closing the openings with the upper housing 110 and the lower housing 130. In addition, the openings are provided at both end surfaces of the main housing 120, and the cross-sections of the openings and the main housing 120 are now consistent, which facilitates the demoulding operation of the casting molding, helps to reduce the manufacturing cost of the main housing 120, and improves the product consistency of the main housing 120.

[0047] Of course, the opening may also be provided on the outer wall of the main shell 120 , and the opening may be closed by a sealing plate fixed to the main shell 120 . The sealing plate may be fixed by fasteners, or the sealing plate may be welded to the main shell 120 .

[0048] Reference Figure 5 It should be understood that along the circumference of the main shell 120, the multiple cavities 102 are distributed at intervals, among which uniform distribution in the circumference is the preferred solution. In the circumference of the main shell 120, the distribution of the multiple cavities 102 is relatively regular, and the vibration reduction and noise reduction effects at various positions in the circumferential direction are relatively uniform, which is beneficial to reducing the working noise of the rotary compressor.

[0049] In the circumferential direction of the main housing 120, the plurality of cavities 102 may also be distributed non-uniformly. Figure 1 and Figure 4 As shown, the outer wall of the main shell 120 is provided with a mounting seat 140 for connecting to the liquid storage tank 500 and a connecting seat 150 for connecting to the connecting pipe 510. Since the wall thickness of the mounting seat 140 and the connecting seat 150 is increased, the cavity 102 can avoid the location of the mounting seat 140 and the connecting seat 150, which is beneficial to the manufacture of the main shell 120 and minimizes the impact on the vibration reduction and noise reduction effects.

[0050] Reference Figure 5 It can be understood that the main housing 120 is provided with a plurality of mounting posts 160, which are arranged along the axial direction of the main housing 120. In the circumferential direction of the main housing 120, the plurality of cavities 102 and the plurality of mounting posts 160 are staggeredly distributed. On the one hand, the mounting posts 160 separate the plurality of cavities 102, and at the same time, the mounting posts 160 form part of the inner wall of the cavity 102. On the other hand, the mounting posts 160 increase the structural strength of the main housing 120, and the plurality of mounting posts 160 spaced apart in the circumferential direction make the structural strength of each position of the main housing 120 more balanced, which is conducive to reducing the working noise of the rotary compressor.

[0051] It is understandable that the staggered distribution of the plurality of cavities 102 and the plurality of mounting posts 160 is not limited to a one-to-one correspondence, and two cavities 102 may be arranged between two mounting posts 160, or may be distributed in various numbers without any rules.

[0052] Referring to Figure 4 and Figure 5 it can be understood that the main housing 120 is provided with eight mounting posts 160 which are evenly distributed along the circumferential direction of the main housing 120. At least one cavity 102 is arranged between two adjacent mounting posts 160. That is, the multiple cavities 102 are divided into eight columns. There is a cavity 102 and damping material 400 between any two adjacent mounting posts 160, which can effectively attenuate the transmission of vibration and noise, and reduce the working noise of the rotary compressor.

[0053] Referring to Figure 5 and Figure 6 the multiple cavities 102 are divided into eight columns in the circumferential direction and divided into two groups in the axial direction, which is beneficial to demolding during the casting of the main housing 120, reduces costs, and the multiple cavities 102 are relatively regularly distributed, which can effectively attenuate the transmission of vibration and noise, and reduce the working noise of the rotary compressor. It can be understood that the division of each column of cavities 102 in the axial direction can be the same or different, and can be set according to the shape of the main housing 120 and the requirements of fitting and assembling.

[0054] Referring to Figure 1 the mounting posts 160 serve as the mounting structures for both the upper housing 110 and the lower housing 130 at the same time. The upper housing 110 and the lower housing 130 are connected to the mounting posts 160 through fasteners. A metal sealing ring is used between the upper housing 110 and the main housing 120, and a metal sealing ring is also used between the lower housing 130 and the main housing 120. Bolts can be used as fasteners. Threaded holes are provided at the end faces of the mounting posts 160, and through holes corresponding to the threaded holes are provided on the upper housing 110 and the lower housing 130. The bolts pass through the through holes and then are screwed into the threaded holes to fix the upper housing 110 and the lower housing 130 to the main housing 120, and use metal sealing rings to achieve sealing to prevent the refrigerant in the installation cavity 101 from leaking. Considering that the upper housing 110, the main housing 120 and the lower housing 130 are all rigid metal parts, and there is a refrigerant with a relatively high pressure inside the housing assembly 100, using metal sealing rings can withstand a relatively large locking force, improve the sealing performance, and prevent the refrigerant from leaking. Rivets, pins, etc. can also be used as fasteners as long as the requirements of fixed connection are met.

[0055] Referring to Figure 5 it can be understood that in the circumferential direction of the main housing 120, each cavity 102 corresponds to a sector with respect to the axis of the main housing 120, and the angles occupied by the sectors of each cavity 102 are equal. That is, the sizes of the cavities 102 in the circumferential direction of the main housing 120 are the same. It is both evenly distributed in the circumferential direction and has the same circumferential size, and the vibration reduction and noise reduction effects at various positions on the circumference of the main housing 120 are relatively uniform, which is beneficial to reducing the working noise of the rotary compressor.

[0056] Referring to Figure 1 and Figure 2 it can be understood that the damping material 400 is selected as damping particles, and multiple damping particles are filled in each cavity 102. The multiple damping particles have consistent external dimensions. When the vibrations of the motor assembly 200 and the pump body assembly 300 are transmitted to the main housing 120, it prompts the damping particles to move in the cavity 102, so as to collide with each other or collide with the inner wall of the cavity 102, reducing the vibration transmitted to the outer wall of the main housing 120 and reducing the external radiation noise of the main housing 120.

[0057] Alternatively, the multiple damping particles have external dimensions of multiple specifications. When the vibrations of the motor assembly 200 and the pump body assembly 300 are transmitted to the main housing 120, it prompts the damping particles to move in the cavity 102, so as to collide with each other or collide with the inner wall of the cavity 102, reducing the vibration transmitted to the outer wall of the main housing 120 and reducing the external radiation noise of the main housing 120. The damping particles of multiple specifications move more disorderly, effectively attenuating the transmission of vibrations.

[0058] It can be understood that the damping particles can 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, leaving some space for the damping particles to move. Among them, a filling rate of 90% is preferred, which can not only meet the space requirements for the damping particles to collide with each other, but also fill as many damping particles as possible, achieving better vibration reduction and noise reduction effects.

[0059] Referring to Figure 1 and Figure 2 it can be understood that a radially protruding mounting ring 121 is provided on the inner wall of the main housing 120. The pump body assembly 300 is connected to the mounting ring 121 through fasteners, and the mounting ring 121 is located above the pump body assembly 300. Considering that a through hole needs to be provided in the middle of the mounting ring 121 for the rotation 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, avoiding interference with the rotation shaft 330. Moreover, the force of the connection between the mounting ring 121 and the cylinder 310 is more balanced and the structure is reliable.

[0060] It can be understood that the fasteners are bolts. Threaded holes are provided on the lower end surface of the mounting ring 121, and through holes corresponding to the threaded holes are provided around the cylinder 310. The bolts pass through the through holes and then are screwed into the threaded holes to fix the cylinder 310. The structure is simple and the disassembly and assembly are convenient.

[0061] Referring to Figure 1 and Figure 2, it can be understood that an installation groove 122 is further provided on the inner wall of the main housing 120, and the motor assembly 200 is installed in the installation groove 122. The motor assembly 200 and the peripheral wall of the installation groove 122 can be in interference fit to achieve fixation by using the interference fit, and at the same time eliminate the gap to prevent the motor assembly 200 from colliding with the main housing 120 during operation and generating noise. Or, the motor assembly 200 is first installed in the installation groove 122, and then the motor assembly 200 is fixed by fasteners such as bolts.

[0062] Considering that the motor assembly 200 is installed in the installation cavity 101 from the upper end of the main housing 120, the installation groove 122 is both the installation structure and the support structure of the motor assembly 200, accurately defining the axial position of the motor assembly 200 and improving the reliability of the rotary compressor.

[0063] Of course, the motor assembly 200 can also be fixed on the mounting ring 121, and the motor assembly 200 is also fixed to the mounting ring 121 by fasteners. The height dimension of the mounting ring 121 in the axial direction of the main housing 120 can be increased to improve the structural strength, so as to fix and support the motor assembly 200 and the pump body assembly 300 at the same time.

[0064] It can be understood that the main housing 120 is an integrally formed structural member made of cast aluminum, while the connecting pipe 510 is made of cast iron and cannot be fixedly connected by welding. The connecting seat 150 is provided with a through air inlet to communicate with the installation cavity 101. A sleeve 520 is sleeved on the outer wall of the connecting pipe 510, and a fixing ring 530 is sleeved on the outer wall of the sleeve 520. The fixing ring 530 is fixed to the connecting seat 150 by a plurality of fastening bolts 540. The sleeve 520 passes through the air inlet and is inserted into the suction port of the cylinder 310. The plurality of fastening bolts 540 are spaced circumferentially along the connecting pipe 510, with balanced force and stable and reliable structure.

[0065] During the assembly process of the rotary compressor, first, the fixing ring 530 is sleeved on the sleeve 520 and welded and fixed, then the sleeve 520 is sleeved on the connecting pipe 510 and welded and fixed, then the sleeve 520 is inserted into the air inlet, and finally the fixing ring 530 is fixed to the connecting seat 150 by a plurality of fastening bolts 540, realizing the fixed connection between the connecting pipe 310 and the main housing 120. The connection method is simple and reliable. Even if the main housing 120 and the connecting pipe 510 are made of dissimilar materials, the reliability of the connection can be effectively guaranteed.

[0066] Considering the requirements for sealing performance, a seal 550 is provided between the fixed ring 530 and the connecting seat 150 to achieve the seal between the fixed ring 530 and the connecting seat 150, effectively preventing the refrigerant from leaking through the gap between the fixed ring 330 and the connecting seat 150. It should be understood that the fixed ring 530 and the sleeve 520 are sealed by welding. The weld seam is annular and closes the gap between the fixed ring 530 and the sleeve 520. The sleeve 520 and the connecting pipe 510 are sealed by welding. The weld seam is annular and closes the gap between the sleeve 520 and the connecting pipe 510. Moreover, the seal 550 is used to seal the connection between the fixed ring 530 and the connecting seat 150, basically eliminating the risk of leakage.

[0067] It should be noted that the seal 550 can be a sealing ring or a gasket. During the assembly process, the sleeve 520, the fixed ring 530, and the connecting pipe 510 are first welded together. After cooling, the fixed ring 530 is fixed to the connecting seat 150 using the fastening bolts 540, effectively preventing the seal 550 from being damaged by the residual heat after welding.

[0068] The seal 550 can be an O-ring. An installation groove is formed between the fixed ring 530 and the connecting seat 150 to define the O-ring. The installation groove can be separately provided on the end face of the fixed ring 530, or separately provided on the end face of the connecting seat 150, or half of the installation groove can be provided on the end face of the fixed ring 530 and half on the end face of the connecting seat 150. The cross-section of the installation groove is slightly smaller than the cross-section of the O-ring. The fixed ring 530 and the connecting seat 150 cooperate to clamp the O-ring, and the seal is achieved by the deformation of the O-ring to prevent the refrigerant from leaking. The O-ring is located inside the plurality of fastening bolts 540 and is not affected by the fastening bolts 540, improving the reliability of the seal.

[0069] The seal 550 can also be a gasket. The fixed ring 530 and the connecting seat 150 cooperate to clamp the gasket, and the seal is achieved by the deformation of the gasket to prevent the refrigerant from leaking. The gasket is provided with through holes for the fastening bolts 540 to pass through. Therefore, on the basis of achieving the seal between the fixed ring 530 and the connecting seat 150, the gasket also seals around the fastening bolts 540, further reducing the risk of leakage.

[0070] It can be understood that the gasket can be an asbestos-free gasket, a rubber gasket, etc. The gasket has a certain elasticity and can deform to meet the requirements of non-sealing. At the same time, the gasket can also absorb the assembly error between the end face of the fixed ring 530 and the end face of the connecting seat 150, reducing the manufacturing accuracy and assembly accuracy of the fixed ring 530 and the connecting seat 150, which is beneficial to reducing production costs.

[0071] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the relevant art.

Claims

1. Rotary compressor, characterized in that, Including: A housing assembly, including an upper housing, a main housing, and a lower housing. The upper housing and the lower housing are respectively connected to two ends of the main housing and enclose an installation cavity. The main housing is an integrally formed structural member made of cast aluminum. The main housing has a plurality of cavities located outside the installation cavity, and damping materials are filled in the cavities; A motor assembly, located in the installation cavity and connected to the main housing; A pump body assembly, located in the installation cavity and connected to the main housing; Axially along the main housing, the plurality of cavities are distributed in two groups, and the cavities are arranged for demolding axially; axially along the main housing, the separation structure between the two groups of cavities is located between the motor assembly and the pump body assembly; the main housing is further provided with a plurality of mounting posts for connecting the upper housing and the lower housing. Circumferentially along the main housing, the plurality of cavities are spaced apart, and the plurality of cavities and the plurality of mounting posts are staggered; 2. The rotary compressor according to claim 1, wherein Both end faces of the main housing are provided with openings communicating with the cavities; 3. The rotary compressor according to claim 1, wherein, Circumferentially on the main housing, the angle occupied by each cavity is equal; 4. The rotary compressor according to claim 3, wherein The main housing is provided with eight circumferentially evenly distributed mounting posts, and at least one cavity is arranged between two adjacent mounting posts; 5. The rotary compressor according to claim 4, wherein, The upper housing and the lower housing are connected to the mounting posts by fasteners, and metal sealing rings are provided between the upper housing and the main housing and between the lower housing and the main housing; 6. The rotary compressor according to claim 1, characterized in that, The damping material is damping particles, and a plurality of the damping particles are filled in the cavities. The outer dimensions of the plurality of damping particles are the same or have multiple specifications; 7. The rotary compressor according to claim 6, wherein The filling rate of the damping particles in the cavities is 60% to 90%; 8. The rotary compressor according to claim 1, characterized in that, A radially protruding mounting ring is provided on the inner wall of the main housing, and the pump body assembly is connected to the mounting ring by fasteners; 9. The rotary compressor according to claim 8, characterized in that, An installation groove is provided on the inner wall of the main housing, and the motor assembly is installed in the installation groove; or the motor assembly is connected to the mounting ring by fasteners.

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