Pump body assembly and rotary compressor

Abstract

This invention provides a pump body assembly and a rotary compressor to improve volumetric efficiency and reduce exhaust noise. The pump body assembly includes: a front-stage cylinder with a first exhaust port; a rear-stage cylinder with a first intake port; a connecting component having a connecting channel; one end of the connecting channel communicating with the first exhaust port and the other end communicating with the first intake port; and a first movable component disposed within the connecting channel. The first movable component includes a first movable member movably disposed along the axial direction of the connecting channel, allowing the connecting channel to have a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port and the first intake port.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a pump assembly and a rotary compressor. Background Technology

[0002] The pump assembly is one of the most important components of the compressor, and it is the part that compresses the refrigerant.

[0003] In a twin-cylinder rotary compressor, the pump body assembly mainly consists of parts such as an upper flange, a lower flange, an upper cylinder, a lower cylinder, rollers, vanes, a crankshaft, partitions, and compression springs; the parts are mostly connected by screws and sealed with flat surfaces. After the low-temperature, low-pressure refrigerant enters the cylinder in the pump body assembly, it is compressed by the movement of the rollers and becomes high-temperature, high-pressure refrigerant, which is then discharged from the cylinder.

[0004] Currently, two-stage enthalpy-increasing compressors typically use a partition cavity, flange cavity, or shell cavity as a transition between the high and low pressure compression chambers. The primary compressed gas passes through this cavity before entering the secondary compression chamber, resulting in low volumetric efficiency and low refrigerant utilization.

[0005] Most two-stage enthalpy-increasing compressor pump assemblies use the following exhaust method: A hole is drilled in the upper and lower flanges, connecting the cylinder cavity to the outside. A valve plate and baffle are riveted to the valve seat to cover this hole. When the refrigerant pressure inside the cylinder is higher than the sum of the external gas pressure and the valve plate pressure, the valve plate is pushed open, and the refrigerant is discharged. This exhaust method relies on the opening and closing of the valve plate, placing high demands on the strength of the valve plate and the precision of the valve seat. Insufficient valve plate strength can easily lead to breakage, and insufficient valve seat precision can easily lead to leakage. Both of these situations will prevent the pump assembly from operating normally. Furthermore, the valve plate continuously strikes the valve seat during opening and closing, generating mechanical noise; and the discharge of high-pressure gas after the second stage of compression increases the valve plate opening range, resulting in increased exhaust noise.

[0006] Patent CN109595172B discloses a two-stage compressor. The compressor pump body assembly has an opening in the upper flange to connect the pump body to the upper cylinder; and an opening in the partition to connect the upper cylinder and the lower cylinder to achieve two-stage enthalpy enhancement. Although this solution can reduce leakage and improve volumetric efficiency by directly connecting the first and second stage compression chambers (upper and lower cylinders), this direct connection method will cause incomplete compression in the first stage to be discharged into the second stage compression chamber. Summary of the Invention

[0007] The main objective of this invention is to provide a pump body assembly and a rotary compressor to improve volumetric efficiency and reduce exhaust noise.

[0008] To achieve the above objectives, according to one aspect of the present invention, a pump body assembly is provided, comprising: a front-stage cylinder having a first exhaust port; a rear-stage cylinder having a first intake port; a connecting member having a connecting channel; one end of the connecting channel communicating with the first exhaust port and the other end of the connecting channel communicating with the first intake port; and a first movable component disposed within the connecting channel; the first movable component including a first movable member movably disposed along the axial direction of the connecting channel to allow the connecting channel to have a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port and the first intake port.

[0009] Furthermore, the connecting channel has a first opening, and a first movable component is located on the side of the first opening near the first air inlet, so that when the air pressure in the subsequent cylinder is greater than the air pressure in the preceding cylinder, the first movable component abuts against the first opening to block the first opening; and when the air pressure in the preceding cylinder is greater than the air pressure in the subsequent cylinder, the first movable component moves away from the first opening so that the first opening is in an open state.

[0010] Furthermore, the connecting channel includes a first channel segment and a second channel segment. A first end of the first channel segment is connected to a first exhaust port, and a second end of the first channel segment is connected to the first end of the second channel segment. The second end of the second channel segment is connected to a first air intake port. The cross-section of the second end of the first channel segment is smaller than the cross-section of the first end of the second channel segment, so that the second port of the first channel segment forms a first opening. A first movable component is disposed within the second channel segment. Alternatively, a first stop is disposed within the connecting channel, and the first opening is disposed on the first stop.

[0011] Furthermore, the first movable component also includes a first elastic member, which has a first end and a second end disposed opposite to each other along its elastic extension direction. The elastic extension direction of the first elastic member is parallel to or the same as the axial direction of the connecting channel. The second end of the first elastic member is fixed relative to the channel wall of the connecting channel, and the first end of the first elastic member is connected to or abuts against the first movable member.

[0012] Furthermore, a first exhaust passage is provided on the partition between the first stage cylinder and the second stage cylinder. One end of the first exhaust passage is connected to the interior of the second stage cylinder. The other end of the first exhaust passage extends to the outer peripheral wall of the partition to communicate with the external components of the pump body. The pump body assembly also includes a second movable component disposed in the first exhaust passage. The second movable component includes a second movable member, which is movably disposed along the axial direction of the first exhaust passage so that the first exhaust passage has a connected state and a disconnected state.

[0013] Furthermore, the first exhaust passage has a second opening, and the second movable component is located on the side of the second opening near the external component of the pump body, so that when the air pressure in the external component of the pump body is greater than the air pressure in the subsequent cylinder, the second movable component abuts against the second opening to block the second opening; and when the air pressure in the subsequent cylinder is greater than the air pressure in the external component of the pump body, the second movable component moves away from the second opening to open the second opening.

[0014] Furthermore, the first exhaust passage includes a fifth passage segment and a sixth passage segment. The first end of the fifth passage segment communicates with the interior of the next stage cylinder, and the second end of the fifth passage segment communicates with the first end of the sixth passage segment. The second end of the sixth passage segment extends to the outer peripheral wall of the partition. The cross-section of the second end of the fifth passage segment is smaller than the cross-section of the first end of the sixth passage segment, so that the second port of the fifth passage segment forms a second opening. The second movable component is disposed within the sixth passage segment. Alternatively, a second stop is provided within the first exhaust passage, and the second opening is disposed on the second stop.

[0015] Furthermore, the second movable component also includes a second elastic member, which has a first end and a second end disposed opposite to each other along its elastic extension direction. The elastic extension direction of the second elastic member is parallel to or the same as the axial direction of the first exhaust channel. The second end of the second elastic member is fixed relative to the channel wall of the first exhaust channel, and the first end of the second elastic member is connected to or abuts against the second movable member.

[0016] Furthermore, the fifth channel segment includes the seventh channel segment and the eighth channel segment. The first end of the seventh channel segment is the first end of the fifth channel segment, the second end of the seventh channel segment is connected to the first end of the eighth channel segment, and the second end of the eighth channel segment is the second end of the fifth channel segment. The cross-section of the sixth channel segment is larger than the cross-section of the eighth channel segment, and the cross-section of the eighth channel segment is larger than the cross-section of the seventh channel segment.

[0017] According to another aspect of the invention, a rotary compressor is provided, which includes the pump body assembly described above.

[0018] According to the technical solution of this invention, the pump body assembly includes a front-stage cylinder, a rear-stage cylinder, a connecting component, and a first movable component; the front-stage cylinder is provided with a first exhaust port, which communicates with the interior of the front-stage cylinder; the rear-stage cylinder is provided with a first air inlet, which communicates with the interior of the rear-stage cylinder; the connecting component has a connecting channel, one end of which communicates with the first exhaust port, and the other end of which communicates with the first air inlet; the first movable component is disposed within the connecting channel; the first movable component includes a first movable member, which is movably disposed along the axial direction of the connecting channel so that the connecting channel has a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port and the first air inlet.

[0019] In practice, when the air pressure in the first-stage cylinder is greater than the air pressure in the next-stage cylinder, the connecting channel is open, allowing the first exhaust port and the first intake port to connect, thus enabling the compressed gas from the first-stage cylinder to enter the next-stage cylinder for further compression. When the air pressure in the next-stage cylinder is greater than the air pressure in the first-stage cylinder, the connecting channel is closed, disconnecting the first exhaust port and the first intake port.

[0020] The pump body assembly of the present invention eliminates the transition cavity of conventional two-stage pump bodies, thereby improving refrigerant utilization and pump volumetric efficiency. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A schematic diagram of the unassembled pump body assembly according to the present invention is shown;

[0023] Figure 2 It shows Figure 1 A magnified view of a portion of the pump body assembly;

[0024] Figure 3 A schematic diagram of the assembly structure of the connecting part and the first movable part of the pump body assembly according to the present invention is shown;

[0025] Figure 4 A schematic diagram of the structure of the diaphragm of the pump body assembly according to the present invention is shown;

[0026] Figure 5 It shows Figure 4 A cross-sectional view of the partition at point BB;

[0027] Figure 6 It shows Figure 5 A cross-sectional view of the partition at point CC (i.e., a structural schematic diagram of the first exhaust passage).

[0028] Figure 7 A schematic diagram of the structure of the first exhaust passage of the pump body assembly according to the present invention and the second movable component disposed therein is shown.

[0029] The above figures include the following reference numerals:

[0030] 10. First stage cylinder; 11. First exhaust port; 12. Second exhaust passage; 13. Third exhaust port; 131. First sealing element;

[0031] 20. Rear-stage cylinder; 21. First intake port; 22. Intake passage;

[0032] 30. Connecting component; 301. First body segment; 302. Second body segment; 303. Third body segment;

[0033] 31. Connecting channel; 311. First opening; 312. First channel segment; 313. Second channel segment; 314. Third channel segment; 315. Fourth channel segment; 32. First stop;

[0034] 41. First elastic component; 42. First movable component;

[0035] 50. Partition plate; 51. Mounting groove; 52. First exhaust passage; 521. Second opening; 522. Fifth passage section; 523. Sixth passage section; 524. Seventh passage section; 525. Eighth passage section; 53. Second stop;

[0036] 61. Second elastic element; 62. Second movable element;

[0037] 711. First slider; 712. First spring;

[0038] 721. Second slider; 722. Second spring. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] This invention provides a pump body assembly, please refer to... Figures 1 to 7The pump assembly includes a front-stage cylinder 10, a rear-stage cylinder 20, a connecting component 30, and a first movable component. The front-stage cylinder 10 is provided with a first exhaust port 11, which communicates with the interior of the front-stage cylinder 10. The rear-stage cylinder 20 is provided with a first air inlet port 21, which communicates with the interior of the rear-stage cylinder 20. The connecting component 30 has a connecting channel 31, one end of which communicates with the first exhaust port 11, and the other end of which communicates with the first air inlet port 21. The first movable component is disposed within the connecting channel 31. The first movable component includes a first movable member 42, which is movably disposed along the axial direction of the connecting channel 31 so that the connecting channel 31 has a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port 11 and the first air inlet port 21.

[0043] In practice, when the air pressure in the first-stage cylinder 10 is greater than the air pressure in the next-stage cylinder 20, the connecting channel 31 is open, connecting the first exhaust port 11 and the first intake port 21, allowing the compressed gas in the first-stage cylinder 10 to enter the next-stage cylinder 20 for further compression. When the air pressure in the next-stage cylinder 20 is greater than the air pressure in the first-stage cylinder 10, the connecting channel 31 is closed, disconnecting the first exhaust port 11 and the first intake port 21.

[0044] For example, the first stage cylinder 10 is the first stage cylinder, and the second stage cylinder 20 is the second stage cylinder.

[0045] Optionally, the preceding stage cylinder 10 is the upper cylinder, and the following stage cylinder 20 is the lower cylinder. Alternatively, the preceding stage cylinder 10 is the lower cylinder, and the following stage cylinder 20 is the upper cylinder.

[0046] In this application, the connecting channel 31 has a first opening 311, and a first movable component is located on the side of the first opening 311 near the first air inlet 21. When the air pressure in the subsequent stage cylinder 20 is greater than the air pressure in the preceding stage cylinder 10, under the action of the pressure difference, the first movable component 42 abuts against the first opening 311 to block the first opening 311. At this time, the first opening 311 is in a closed state, and the connecting channel 31 is in a disconnected state. When the air pressure in the preceding stage cylinder 10 is greater than the air pressure in the subsequent stage cylinder 20, under the action of the pressure difference, the first movable component 42 moves in the direction closer to the first air inlet 21 to move away from the first opening 311. At this time, the first opening 311 is in an open state, and the connecting channel 31 is in a connected state.

[0047] In this application, the first configuration of the first opening 311 is as follows: the connecting channel 31 includes a first channel segment 312 and a second channel segment 313. The first end of the first channel segment 312 is connected to the first exhaust port 11, the second end of the first channel segment 312 is connected to the first end of the second channel segment 313, and the second end of the second channel segment 313 is connected to the first air inlet 21. The cross-section of the second end of the first channel segment 312 is smaller than the cross-section of the first end of the second channel segment 313, so that the second port of the first channel segment 312 forms the first opening 311. The first movable component is disposed in the second channel segment 313.

[0048] In this application, the second configuration of the first opening 311 is as follows: a first stop 32 is provided in the connecting channel 31, the first opening 311 is provided on the first stop 32, and the first movable component is located on the side of the first stop 32 near the first air inlet 21.

[0049] Optionally, the outer peripheral wall of the first stop portion 32 is press-fitted with the channel wall of the connecting channel 31 so that the first stop portion 32 is locked in the connecting channel 31, thereby fixing the first stop portion 32 in the connecting channel 31; and ensuring the sealing of the first stop portion 32 when the first opening 311 is in the closed state.

[0050] like Figure 3 As shown, although the connecting channel 31 includes a first channel segment 312 and a second channel segment 313, and the cross-section of the second end of the first channel segment 312 is smaller than the cross-section of the first end of the second channel segment 313, the first opening 311 is provided on the first stop 32 because the first stop 32 is provided and the first stop 32 is located inside the second channel segment 313.

[0051] In this application, the first movable component further includes a first elastic member 41, which has a first end and a second end disposed opposite to each other along its elastic extension direction. The elastic extension direction of the first elastic member 41 is parallel to or the same as the axial direction of the connecting channel 31, that is, the elastic extension direction of the first elastic member 41 is parallel to or the same as the axial direction of the second channel segment 313. The first elastic member 41 is located on the side of the first movable member 42 away from the first opening 311. The second end of the first elastic member 41 is fixed relative to the channel wall of the connecting channel 31, and the first end of the first elastic member 41 is connected to or abuts against the first movable member 42.

[0052] In the specific implementation process, when the air pressure in the first stage cylinder 10 is greater than the sum of the air pressure in the next stage cylinder 20 and the elastic force of the first elastic member 41, the first movable member 42 is subjected to force as a whole towards the first air inlet 21. The first movable member 42 moves in the direction close to the first air inlet 21 to move away from the first opening 311, that is, the first movable member 42 is pushed open to separate from the first opening 311 so that the first opening 311 is in the open state. At this time, the first elastic member 41 is compressed.

[0053] When the air pressure in the first stage cylinder 10 is less than the sum of the air pressure in the next stage cylinder 20 and the elastic force of the first elastic member 41, the first movable member 42 is subjected to force towards the first opening 311. The first elastic member 41 presses the first movable member 42 tightly at the first opening 311, that is, the first movable member 42 abuts against the first opening 311 to block the first opening 311, so that the first opening 311 is in a closed state, thereby achieving a seal at the first opening 311 and achieving a sealed pressurization of the previous stage cylinder 10.

[0054] Optionally, the outer peripheral wall of the second end of the first elastic member 41 is interference-fitted with the channel wall of the connecting channel 31 so that the second end of the first elastic member 41 is stuck in the connecting channel 31, thereby fixing the second end of the first elastic member 41 relative to the channel wall of the connecting channel 31.

[0055] Optionally, the outer peripheral cross-section of the second end of the first elastic member 41 is larger than the outer peripheral cross-section of the first end of the first elastic member 41, so as to achieve an interference fit between the outer peripheral wall of the second end of the first elastic member 41 and the channel wall of the connecting channel 31, and the first end of the first elastic member 41 is connected to or abuts against the first movable member 42.

[0056] Optionally, when the first end of the first elastic member 41 is connected to the first movable member 42, the first end of the first elastic member 41 can be welded to the first movable member 42 to ensure alignment accuracy and prevent the first movable member 42 from shifting during compressor operation.

[0057] Optionally, the first elastic element 41 is a spring.

[0058] Optionally, the first movable element 42 has a spherical structure. For example, the first movable element 42 is a valve ball.

[0059] Optionally, the first stop portion 32 is a washer.

[0060] Optionally, the first opening 311 is a circular opening.

[0061] Specifically, the diameter of the first opening 311 is smaller than the diameter of the first movable member 42, and the diameter of the first movable member 42 is smaller than the cross-sectional diameter of the second channel segment 313, so as to block the first opening 311 when the first movable member 42 abuts against the first opening 311, ensuring the sealing of the first opening 311; and when the first opening 311 is in the open state, the airflow can flow out through the gap between the first movable member 42 and the channel wall of the second channel segment 313.

[0062] Optionally, at least a portion of the first stop portion 32 is made of a flexible material (i.e., an elastic soft material) so that the first stop portion 32 can deform, and this deformation can reduce exhaust vibration and exhaust noise. For example, at least a portion of the first stop portion 32 is made of rubber.

[0063] In this application, the first end of the connecting component 30 is inserted into the first exhaust port 11, so that the first end of the connecting channel 31 communicates with the first exhaust port 11, and ensures the sealing between the outer peripheral wall of the first end of the connecting component 30 and the hole wall of the first exhaust port 11. At this time, the first end of the connecting component 30 is fixedly connected to the first exhaust port 11 of the preceding stage cylinder 10. The second end of the connecting component 30 is inserted into the first air inlet 21, so that the second end of the connecting channel 31 communicates with the first air inlet 21, and ensures the sealing between the outer peripheral wall of the second end of the connecting component 30 and the hole wall of the first air inlet 21. At this time, the second end of the connecting component 30 is fixedly connected to the first air inlet 21 of the following stage cylinder 20.

[0064] Specifically, the first end of the connecting component 30 is interference-fitted with the wall of the first exhaust port 11; the second end of the connecting component 30 is interference-fitted with the wall of the first air intake port 21.

[0065] like Figure 3 As shown, the first channel segment 312 includes a third channel segment 314 and a fourth channel segment 315. The first end of the third channel segment 314 is the first end of the first channel segment 312, and the second end of the third channel segment 314 is connected to the first end of the fourth channel segment 315. The second end of the fourth channel segment 315 is the second end of the first channel segment 312. The cross-section of the third channel segment 314 is larger than the cross-section of the fourth channel segment 315. The cross-section of the second channel segment 313 is larger than the cross-section of the fourth channel segment 315, so that the cross-section of the first end of the second channel segment 313 is larger than the cross-section of the second end of the first channel segment 312.

[0066] The connecting component 30 includes a first body segment 301, a second body segment 302, and a third body segment 303 connected in sequence. A third channel segment 314 is disposed on the first body segment 301, a fourth channel segment 315 is disposed on the second body segment 302, and a second channel segment 313 is disposed on the third body segment 303.

[0067] The outer peripheral cross section of the first body section 301 is larger than the outer peripheral cross section of the second body section 302, so that the first end of the connecting component 30 is in an interference fit with the wall of the first exhaust port 11; the outer peripheral cross section of the third body section 303 is larger than the outer peripheral cross section of the second body section 302, so that the second end of the connecting component 30 is in an interference fit with the wall of the first air inlet port 21.

[0068] The connecting component 30 has a structure that is thick at both ends and thin in the middle.

[0069] It should be noted that, since the cross-section of the second channel segment 313 is larger than that of the fourth channel segment 315, and the cross-section of the third channel segment 314 is larger than that of the fourth channel segment 315, the connecting component 30 is similar to a pipe silencer and can reduce the noise of gas flow.

[0070] Optionally, since the cross-section of the second end of the first channel segment 312 is smaller than the cross-section of the first end of the second channel segment 313, a stepped structure is necessarily formed between the second end of the first channel segment 312 and the first end of the second channel segment 313, and the first stop 32 is set at the stepped structure.

[0071] Optionally, the difference between the diameter of the cross section of the second channel segment 313 and the diameter of the cross section of the fourth channel segment 315 is a preset difference value. The preset difference value is greater than or equal to 0.5mm to ensure the width of the step structure and avoid leakage caused by misalignment of the first stop part 32.

[0072] Optionally, the diameter of the cross-section of the third channel segment 314 is equal to the diameter of the cross-section of the second channel segment 313.

[0073] Optionally, the outer peripheral diameter of the first stop portion 32 is approximately 0.1 mm larger than the cross-sectional diameter of the second channel segment 313, so that the outer peripheral wall of the first stop portion 32 is interference-fitted with the channel wall of the second channel segment 313.

[0074] In this application, optionally, the connecting component 30 is a connecting pipe.

[0075] In this application, the outer peripheral wall of the partition 50 between the first stage cylinder 10 and the second stage cylinder 20 is recessed with a mounting groove 51 so that the connecting component 30 is disposed in the mounting groove 51.

[0076] Optionally, the second body section 302 is disposed within the mounting slot 51.

[0077] Optionally, when the first end of the connecting component 30 is inserted into the first exhaust port 11 and the second end of the connecting component 30 is inserted into the first air inlet port 21, the axial direction of the connecting component 30 is set at an angle to the axial direction of the pump body assembly, that is, the connecting component 30 is set at an inclination relative to the axial direction of the pump body assembly.

[0078] Optionally, the outer peripheral wall of the first end of the connecting component 30 is recessed with a first groove so that the first seal is disposed in the first groove, thereby sandwiching the first seal between the outer peripheral wall of the first end of the connecting component 30 and the hole wall of the first vent 11, further enhancing the sealing performance.

[0079] Optionally, the first groove is an annular groove; the first seal is a sealing ring. For example, the first seal is a rubber ring.

[0080] Optionally, the outer peripheral wall of the second end of the connecting component 30 is recessed with a second groove so that the second seal is disposed in the second groove, thereby sandwiching the second seal between the outer peripheral wall of the second end of the connecting component 30 and the wall of the first air inlet 21, further enhancing the sealing performance.

[0081] Optionally, the second groove is an annular groove; the second seal is a sealing ring. For example, the second seal is a rubber ring.

[0082] In this application, a first exhaust passage 52 is provided on the partition 50 between the first-stage cylinder 10 and the second-stage cylinder 20 to achieve partition exhaust; one end of the first exhaust passage 52 communicates with the interior of the second-stage cylinder 20; the other end of the first exhaust passage 52 extends to the outer peripheral wall of the partition 50 so that the other end of the first exhaust passage 52 communicates with the external components of the pump body. The pump body assembly also includes a second movable component disposed within the first exhaust passage 52. The second movable component includes a second movable member 62, which is movably disposed along the axial direction of the first exhaust passage 52 so that the first exhaust passage 52 has a connected state and a disconnected state.

[0083] In specific implementation, when the air pressure inside the downstream cylinder 20 is greater than the air pressure inside the external components of the pump body, the first exhaust passage 52 is in a connected state, so that the downstream cylinder 20 is connected to the external components of the pump body, thereby allowing the high-pressure gas inside the downstream cylinder 20 to flow into the external components of the pump body. When the air pressure inside the external components of the pump body is greater than the air pressure inside the downstream cylinder 20, the first exhaust passage 52 is in a disconnected state, so that the downstream cylinder 20 is disconnected from the external components of the pump body.

[0084] In this application, the first exhaust passage 52 has a second opening 521, and the second movable component is located on the side of the second opening 521 closer to the external component of the pump body. When the air pressure inside the external component of the pump body is greater than the air pressure inside the subsequent stage cylinder 20, under the action of the pressure difference, the second movable component 62 abuts against the second opening 521 to block the second opening 521. At this time, the second opening 521 is in a closed state, and the first exhaust passage 52 is in an open state. When the air pressure inside the subsequent stage cylinder 20 is greater than the air pressure inside the external component of the pump body, under the action of the pressure difference, the second movable component 62 moves in the direction closer to the external component of the pump body to move away from the second opening 521. At this time, the second opening 521 is in an open state, and the first exhaust passage 52 is in a connected state.

[0085] In this application, the first configuration of the second opening 521 is as follows: the first exhaust passage 52 includes a fifth passage segment 522 and a sixth passage segment 523. The first end of the fifth passage segment 522 is connected to the interior of the next stage cylinder 20, and the second end of the fifth passage segment 522 is connected to the first end of the sixth passage segment 523. The second end of the sixth passage segment 523 extends to the outer peripheral wall of the partition 50 so that the second end of the sixth passage segment 523 is connected to the external components of the pump body. The cross-section of the second end of the fifth passage segment 522 is smaller than the cross-section of the first end of the sixth passage segment 523 so that the second port of the fifth passage segment 522 forms the second opening 521. The second movable component is disposed in the sixth passage segment 523.

[0086] In this application, the second configuration of the second opening 521 is as follows: a second stop 53 is provided in the first exhaust channel 52, the second opening 521 is provided on the second stop 53, and the second movable component is located on the side of the second stop 53 near the external component of the pump body.

[0087] Optionally, the outer peripheral wall of the second stop 53 is press-fitted with the channel wall of the first exhaust channel 52 so that the second stop 53 is locked in the first exhaust channel 52, thereby fixing the second stop 53 in the first exhaust channel 52; and ensuring the sealing of the second stop 53 when the second opening 521 is closed.

[0088] like Figure 6 and Figure 7 As shown, although the first exhaust passage 52 includes a fifth passage segment 522 and a sixth passage segment 523, and the cross-section of the second end of the fifth passage segment 522 is smaller than the cross-section of the first end of the sixth passage segment 523, the second opening 521 is provided on the second stop portion 53 because the second stop portion 53 is provided and the second stop portion 53 is located inside the sixth passage segment 523.

[0089] In this application, the second movable component further includes a second elastic member 61, which has a first end and a second end disposed opposite to each other along its elastic extension direction. The elastic extension direction of the second elastic member 61 is parallel to or the same as the axial direction of the first exhaust channel 52, that is, the elastic extension direction of the second elastic member 61 is parallel to or the same as the axial direction of the sixth channel segment 523. The second elastic member 61 is located on the side of the second movable member 62 away from the second opening 521. The second end of the second elastic member 61 is fixed relative to the channel wall of the first exhaust channel 52, and the first end of the second elastic member 61 is connected to or abuts against the second movable member 62.

[0090] In the specific implementation process, when the air pressure in the downstream cylinder 20 is greater than the sum of the air pressure in the external component of the pump body and the elastic force of the second elastic member 61, the second movable member 62 is subjected to force towards the external component of the pump body. The second movable member 62 moves in the direction close to the external component of the pump body to move away from the second opening 521. That is, the second movable member 62 is pushed open to separate from the second opening 521 so that the second opening 521 is in the open state. At this time, the second elastic member 61 is compressed.

[0091] When the air pressure inside the downstream cylinder 20 is less than the sum of the air pressure inside the external components of the pump body and the elastic force of the second elastic member 61, the second movable member 62 is subjected to force towards the second opening 521, so that the second elastic member 61 presses the second movable member 62 tightly at the second opening 521, that is, the second movable member 62 abuts against the second opening 521 to seal the second opening 521, so that the second opening 521 is in a closed state, thereby achieving a seal at the second opening 521 and achieving a sealed pressurization of the downstream cylinder 20.

[0092] Optionally, the outer peripheral wall of the second end of the second elastic member 61 is interference-fitted with the channel wall of the first exhaust channel 52 so that the second end of the second elastic member 61 is stuck in the first exhaust channel 52, thereby fixing the second end of the second elastic member 61 relative to the channel wall of the first exhaust channel 52.

[0093] Optionally, the outer peripheral cross section of the second end of the second elastic member 61 is larger than the outer peripheral cross section of the first end of the second elastic member 61, so as to achieve an interference fit between the outer peripheral wall of the second end of the second elastic member 61 and the channel wall of the first exhaust channel 52, and the first end of the second elastic member 61 is connected to or abuts against the second movable member 62.

[0094] Optionally, when the first end of the second elastic member 61 is connected to the second movable member 62, the first end of the second elastic member 61 can be welded to the second movable member 62 to ensure alignment accuracy and prevent the second movable member 62 from shifting during compressor operation.

[0095] Optionally, the second elastic element 61 is a spring.

[0096] Optionally, the second movable element 62 has a spherical structure. For example, the second movable element 62 is a valve ball.

[0097] Optionally, the second stop 53 is a washer.

[0098] Optionally, the second opening 521 is a circular opening.

[0099] Specifically, the diameter of the second opening 521 is smaller than the diameter of the second movable member 62, and the diameter of the second movable member 62 is smaller than the cross-sectional diameter of the sixth channel segment 523, so as to block the second opening 521 when the second movable member 62 abuts against the second opening 521, ensuring the sealing of the second opening 521; and when the second opening 521 is in the open state, the airflow can flow out through the gap between the second movable member 62 and the channel wall of the sixth channel segment 523.

[0100] Optionally, at least a portion of the second stop portion 53 is made of a flexible material (i.e., an elastic soft material) so that the second stop portion 53 can deform, which can reduce exhaust vibration and exhaust noise. For example, at least a portion of the second stop portion 53 is made of rubber.

[0101] Optionally, the outer peripheral diameter of the second stop portion 53 is approximately 0.1 mm larger than the cross-sectional diameter of the sixth channel segment 523, so that the outer peripheral wall of the second stop portion 53 is interference-fitted with the channel wall of the sixth channel segment 523.

[0102] like Figure 6 and Figure 7 As shown, the fifth channel segment 522 includes a seventh channel segment 524 and an eighth channel segment 525. The first end of the seventh channel segment 524 is the first end of the fifth channel segment 522, and the second end of the seventh channel segment 524 is connected to the first end of the eighth channel segment 525. The second end of the eighth channel segment 525 is the second end of the fifth channel segment 522. The cross-section of the sixth channel segment 523 is larger than the cross-section of the eighth channel segment 525, so that the cross-section of the first end of the sixth channel segment 523 is larger than the cross-section of the second end of the fifth channel segment 522.

[0103] The cross-section of the sixth channel segment 523 is larger than that of the eighth channel segment 525, and the cross-section of the eighth channel segment 525 is larger than that of the seventh channel segment 524. This slows down the refrigerant flow rate, thereby reducing exhaust noise. Specifically, the diameter D3 of the cross-section of the sixth channel segment 523 is larger than the diameter D2 of the cross-section of the eighth channel segment 525, and the diameter D2 of the cross-section of the eighth channel segment 525 is larger than the diameter D1 of the cross-section of the seventh channel segment 524.

[0104] Since the cross-section of the first end of the sixth channel segment 523 is larger than the cross-section of the second end of the fifth channel segment 522, a stepped structure is inevitably formed between the first end of the sixth channel segment 523 and the second end of the fifth channel segment 522, and the second stop 53 is set at the stepped structure.

[0105] Optionally, the difference between the diameter of the cross-section of the sixth channel segment 523 and the diameter of the cross-section of the eighth channel segment 525 is a set difference value, which is greater than or equal to 0.5mm, to ensure the width of the stepped structure and prevent leakage caused by misalignment of the second stop 53. That is, D3-D2≥0.5mm.

[0106] Optionally, the diameter of the cross-section of the seventh channel segment 524 is related to the displacement of the subsequent stage cylinder 20. When the displacement is ≤7.5cc, 3mm≤D1<5mm; when 7.5cc<displacement≤10cc, 5mm≤D1<7mm; when 10cc<displacement≤30cc, 7mm≤D1<10mm; when 30cc<displacement≤50cc, 10mm≤D1<15mm.

[0107] Optionally, the axial direction of the seventh channel segment 524 and the axial direction of the eighth channel segment 525 are arranged at an angle. For example, the axial direction of the seventh channel segment 524 and the axial direction of the eighth channel segment 525 are perpendicular to each other.

[0108] Optionally, the axial direction of the eighth channel segment 525 is parallel to or the same as the axial direction of the sixth channel segment 523.

[0109] Optionally, the axial direction of the sixth channel segment 523 is perpendicular to the axial direction of the pump body assembly. For example, the axial direction of the sixth channel segment 523 is parallel to the radial direction of the baffle 50.

[0110] Optionally, the axial direction of the eighth channel segment 525 is perpendicular to the axial direction of the pump body assembly. For example, the axial direction of the eighth channel segment 525 is parallel to the radial direction of the diaphragm 50.

[0111] Optionally, the axial direction of the seventh channel segment 524 is set at an angle to the axial direction of the pump body assembly, so that the axial direction of the seventh channel segment 524 is inclined relative to the axial direction of the pump body assembly.

[0112] Specifically, one end of the first exhaust passage 52 extends to the end face of the partition 50 facing the rear-stage cylinder 20, so as to communicate with the interior of the rear-stage cylinder 20. That is, the first end of the fifth passage segment 522 extends to the end face of the partition 50 facing the rear-stage cylinder 20, so as to communicate with the interior of the rear-stage cylinder 20.

[0113] Optionally, the first exhaust passage 52 is an oblique "L" shaped passage.

[0114] In this application, the first stage cylinder 10 is further provided with a second exhaust passage 12. The first end of the second exhaust passage 12 is connected to the interior of the first stage cylinder 10, the second end of the second exhaust passage 12 is connected to the first end of the first exhaust hole 11, and the second end of the first exhaust hole 11 is connected to the first end of the connecting passage 31.

[0115] Optionally, the axial direction of the second exhaust passage 12 is set at an angle to the axial direction of the first exhaust port 11. For example, the axial direction of the second exhaust passage 12 is perpendicular to the axial direction of the first exhaust port 11.

[0116] Optionally, the axial direction of the first vent 11 is parallel to the axial direction of the pump body assembly. Alternatively, the axial direction of the first vent 11 is set at an angle to the axial direction of the pump body assembly, so that the axial direction of the first vent 11 is inclined relative to the axial direction of the pump body assembly.

[0117] Optionally, the axial direction of the second exhaust passage 12 is perpendicular to the axial direction of the pump body assembly. For example, the axial direction of the second exhaust passage 12 is parallel to the radial direction of the preceding stage cylinder 10.

[0118] Specifically, the first end of the second exhaust passage 12 extends to the inner peripheral wall of the preceding stage cylinder 10, so that the first end of the second exhaust passage 12 communicates with the interior of the preceding stage cylinder 10. The second end of the first exhaust port 11 extends to the end face of the preceding stage cylinder 10 facing the following stage cylinder 20, and the first end of the connecting member 30 is inserted into the second end of the first exhaust port 11.

[0119] Optionally, the first-stage cylinder 10 is also provided with a third exhaust port 13. The first end of the third exhaust port 13 is connected to the second end of the second exhaust passage 12, and the second end of the third exhaust port 13 extends to the outer peripheral sidewall of the first-stage cylinder 10. The axial direction of the third exhaust port 13 is the same as that of the second exhaust passage 12. By inserting the first sealing member 131 into the second end of the third exhaust port 13, the second end of the third exhaust port 13 is sealed to prevent compressed gas from leaking out of the pump body.

[0120] Optionally, the first sealing element 131 is an air plug.

[0121] In this application, the subsequent stage cylinder 20 is also provided with an intake channel 22. The second end of the intake channel 22 is connected to the interior of the subsequent stage cylinder 20, the first end of the intake channel 22 is connected to the second end of the first intake port 21, and the first end of the first intake port 21 is connected to the second end of the connecting channel 31.

[0122] Optionally, the axial direction of the intake passage 22 is set at an angle to the axial direction of the first intake port 21. For example, the axial direction of the intake passage 22 is perpendicular to the axial direction of the first intake port 21.

[0123] Optionally, the axial direction of the first air inlet 21 is parallel to the axial direction of the pump body assembly. Alternatively, the axial direction of the first air inlet 21 is set at an angle to the axial direction of the pump body assembly, so that the axial direction of the first air inlet 21 is inclined relative to the axial direction of the pump body assembly.

[0124] Optionally, the axial direction of the intake passage 22 is perpendicular to the axial direction of the pump body assembly. For example, the axial direction of the intake passage 22 is parallel to the radial direction of the subsequent stage cylinder 20.

[0125] Specifically, the second end of the intake passage 22 extends to the inner peripheral wall of the subsequent stage cylinder 20, so that the second end of the intake passage 22 communicates with the interior of the subsequent stage cylinder 20. The first end of the first intake port 21 extends to the end face of the subsequent stage cylinder 20 facing the preceding stage cylinder 10, and the second end of the connecting component 30 is inserted into the first end of the first intake port 21.

[0126] In this application, the second exhaust channel 12 is a low-pressure exhaust channel, and the first exhaust port 11 is a low-pressure exhaust port. The first exhaust channel 52 is a high-pressure exhaust channel.

[0127] It should be noted that, for a cylinder, the internal cavity of the cylinder includes a compression chamber and an intake chamber. The exhaust port or exhaust passage is connected to the compression chamber of the cylinder, and the intake port or intake passage is connected to the intake chamber of the cylinder. Specifically, the first exhaust port 11 is connected to the compression chamber of the preceding stage cylinder 10, that is, the first end of the second exhaust passage 12 is connected to the compression chamber of the preceding stage cylinder 10; the first intake port 21 is connected to the intake chamber of the following stage cylinder 20, that is, the second end of the intake passage 22 is connected to the intake chamber of the following stage cylinder 20; one end of the first exhaust passage 52 is connected to the compression chamber of the following stage cylinder 20, that is, the first end of the fifth passage segment 522 is connected to the compression chamber of the following stage cylinder 20.

[0128] When the air pressure in the compression chamber of the current stage cylinder 10 is greater than the sum of the air pressure in the intake chamber of the subsequent stage cylinder 20 and the elastic force of the first elastic element 41, the first opening 311 is in the open state; when the air pressure in the compression chamber of the current stage cylinder 10 is less than the sum of the air pressure in the intake chamber of the subsequent stage cylinder 20 and the elastic force of the first elastic element 41, the first opening 311 is in the closed state.

[0129] When the air pressure in the compression chamber of the next stage cylinder 20 is greater than the sum of the air pressure in the external components of the pump body and the elastic force of the second elastic element 61, the second opening 521 is in the open state; when the air pressure in the compression chamber of the next stage cylinder 20 is less than the sum of the air pressure in the external components of the pump body and the elastic force of the second elastic element 61, the second opening 521 is in the closed state.

[0130] Specifically, in addition to drawing air into its intake chamber through the first intake port 21, the subsequent stage cylinder 20 is also provided with a second intake port communicating with its intake chamber. The refrigerant gas introduced through the second intake port mixes with the compressed gas entering through the first intake port 21 within the intake chamber of the subsequent stage cylinder 20. The second intake port is the main intake port, and the first intake port 21 is an auxiliary intake port.

[0131] Specifically, the second end of the second air intake extends to the inner peripheral wall of the subsequent stage cylinder 20 so that the second end of the second air intake communicates with the intake chamber of the subsequent stage cylinder 20; the first end of the second air intake extends to the outer peripheral wall of the subsequent stage cylinder 20 so that the first end of the second air intake communicates with the external component through which the refrigerant gas is introduced.

[0132] Optionally, the compressed gas from the subsequent cylinder 20 can only be discharged through the first exhaust passage 52.

[0133] Optionally, for the first-stage cylinder 10, when the first sealing member 131 blocks the second end of the third exhaust port 13, the third exhaust port 13 is in an open state, and the compressed gas of the first-stage cylinder 10 can only be discharged into the next-stage cylinder 20 through the connecting channel 31; or, when the first sealing member 131 in the second end of the third exhaust port 13 is removed, the third exhaust port 13 is in a connected state, and the compressed gas of the first-stage cylinder 10 is divided into two parts, one part of which is discharged into the next-stage cylinder 20 through the connecting channel 31, and the other part is discharged from the third exhaust port 13.

[0134] The present invention also provides a rotary compressor comprising the pump body assembly described above.

[0135] Optionally, the rotary compressor is a two-stage rotary compressor, that is, the first stage cylinder 10 is a first-stage cylinder and the second stage cylinder 20 is a second-stage cylinder.

[0136] The rotary compressor also includes a first vane 711 and a first spring 712 in the upper cylinder; the rotary compressor also includes a second vane 721 and a second spring 722 in the lower cylinder.

[0137] The rotary compressor of this application is used in air conditioners, especially in energy-saving air conditioners.

[0138] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0139] In the pump assembly provided by the present invention, the pump assembly includes a front-stage cylinder 10, a rear-stage cylinder 20, a connecting component 30, and a first movable component; the front-stage cylinder 10 is provided with a first exhaust port 11, which communicates with the interior of the front-stage cylinder 10; the rear-stage cylinder 20 is provided with a first air inlet port 21, which communicates with the interior of the rear-stage cylinder 20; the connecting component 30 has a connecting channel 31, one end of which communicates with the first exhaust port 11, and the other end of which communicates with the first air inlet port 21; the first movable component is disposed within the connecting channel 31; the first movable component includes a first movable member 42, which is movably disposed along the axial direction of the connecting channel 31 so that the connecting channel 31 has a connected state and a disconnected state, thereby connecting or disconnecting the first exhaust port 11 and the first air inlet port 21.

[0140] In practice, when the air pressure in the first-stage cylinder 10 is greater than the air pressure in the next-stage cylinder 20, the connecting channel 31 is open, connecting the first exhaust port 11 and the first intake port 21, allowing the compressed gas in the first-stage cylinder 10 to enter the next-stage cylinder 20 for further compression. When the air pressure in the next-stage cylinder 20 is greater than the air pressure in the first-stage cylinder 10, the connecting channel 31 is closed, disconnecting the first exhaust port 11 and the first intake port 21.

[0141] The pump body assembly of the present invention eliminates the transition cavity of conventional two-stage pump bodies, thereby improving refrigerant utilization and pump volumetric efficiency.

[0142] The pump assembly of this application connects the first-stage cylinder 10 and the second-stage cylinder 20 via a connecting component 30. The first movable member 42 is pressed and sealed by the first elastic member 41, sealing the first opening 311. The opening and closing of the first movable member 42 is adjusted according to the air pressure within the first-stage cylinder 10 to ensure sufficient compression and improve compression efficiency. The second movable member 62 is pressed and sealed by the second elastic member 61, sealing the second opening 521. The second movable member 62 is pushed open by an increase in air pressure within the second-stage cylinder 20 to achieve exhaust. A first stop 32 is provided between the first movable member 42 and the channel wall of the connecting channel 31, and a second stop 53 is provided between the second movable member 62 and the channel wall of the first exhaust channel 52, providing sealing and noise reduction effects and decreasing exhaust noise.

[0143] The pump body assembly of this application is beneficial to improving the volumetric efficiency of the pump body, increasing the refrigerant utilization rate, and reducing aerodynamic noise; in addition, the exhaust scheme of this application is beneficial to reducing exhaust noise, reducing installation steps, and avoiding the problem of large exhaust leakage.

[0144] Existing two-stage compressor pump body assemblies require valve plates and valve plate baffles to be riveted to flange and partition assemblies before assembly, necessitating specialized riveting equipment and tooling. The exhaust method of this application completely avoids these procedures. It only requires the installation of a connecting component 30 during pump body assembly, with a first movable component and a first stop 32 within the connecting component 30, and a second movable component and a second stop 53 within the first exhaust channel 52. This simplifies the pump body structure, reduces procedures, decreases investment in equipment and tooling, lowers costs, avoids quality problems caused by riveting processes, and improves overall quality.

[0145] The first exhaust channel 52 of the pump body exhaust scheme in this application is set on the partition plate 50, eliminating the need to machine valve seats and exhaust holes on the flange, thus reducing flange machining costs; the valve plate riveting process is eliminated, avoiding leakage problems caused by insufficient valve seat machining accuracy or substandard riveting. The setting of the first stop part 32 and the second stop part 53 can reduce exhaust mechanical noise. The first exhaust channel 52 with a cross-sectional diameter that gradually increases from small to large is conducive to reducing exhaust aerodynamic noise, so a conventional silencer can be eliminated, reducing the required parts and reducing material costs; the use of valve plates is eliminated, reducing design costs, avoiding compressor scrapping due to valve plate breakage, and improving compressor reliability.

[0146] The pump body of this application can effectively reduce costs in terms of design, parts processing and assembly, and can also improve the assembly efficiency and quality of the pump body, reduce compressor noise, improve the reliability of the compressor, and ensure long-term stable and efficient operation of the compressor.

[0147] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0148] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0149] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pump body assembly, characterized by, The utility model relates to a pump body assembly, comprising: a front-stage cylinder (10) provided with a first exhaust hole (11); a rear-stage cylinder (20) provided with a first intake hole (21); a communication component (30) having a communication passage (31); one end of the communication passage (31) is in communication with the first exhaust hole (11), and the other end of the communication passage (31) is in communication with the first intake hole (21); a first movable assembly arranged in the communication passage (31); the first movable assembly comprises a first movable piece (42) movably arranged along the axial direction of the communication passage (31) so that the communication passage (31) has a communication state and a disconnection state, thereby making the first exhaust hole (11) and the first intake hole (21) in communication or disconnected; the communication passage (31) comprises a first passage section (312) and a second passage section (313); the first end of the first passage section (312) is in communication with the first exhaust hole (11), the second end of the first passage section (312) is in communication with the first end of the second passage section (313), and the second end of the second passage section (313) is in communication with the first intake hole (21); the first passage section (312) comprises a third passage section (314) and a fourth passage section (315); the first end of the third passage section (314) is the first end of the first passage section (312), the second end of the third passage section (314) is in communication with the first end of the fourth passage section (315), and the second end of the fourth passage section (315) is the second end of the first passage section (312); the cross section of the third passage section (314) and the cross section of the second passage section (313) are both larger than the cross section of the fourth passage section (315); a first exhaust passage (52) is arranged on a partition plate (50) between the front-stage cylinder (10) and the rear-stage cylinder (20); one end of the first exhaust passage (52) is in communication with the interior of the rear-stage cylinder (20); the other end of the first exhaust passage (52) extends to the peripheral wall of the partition plate (50) to be in communication with the exterior component of the pump body; the pump body assembly further comprises a second movable assembly arranged in the first exhaust passage (52); the second movable assembly comprises a second movable piece (62) movably arranged along the axial direction of the first exhaust passage (52) so that the first exhaust passage (52) has a communication state and a disconnection state.

2. The pump body assembly of claim 1, wherein, The communication passage (31) has a first opening (311), and the first movable assembly is located at one side of the first opening (311) close to the first air inlet hole (21), so that when the air pressure in the rear-stage cylinder (20) is greater than the air pressure in the front-stage cylinder (10), the first movable part (42) abuts at the first opening (311) to block the first opening (311); and when the air pressure in the front-stage cylinder (10) is greater than the air pressure in the rear-stage cylinder (20), the first movable part (42) is away from the first opening (311) to make the first opening (311) in an open state.

3. The pump body assembly according to claim 2, wherein, a cross section of a second end of the first passage section (312) is smaller than a cross section of a first end of the second passage section (313), so that the second end of the first passage section (312) forms the first opening (311); the first movable assembly is arranged in the second passage section (313); or, a first stop portion (32) is arranged in the communication passage (31), and the first opening (311) is arranged on the first stop portion (32).

4. The pump body assembly of claim 3, wherein, The first movable assembly further comprises a first elastic part (41) having a first end and a second end arranged oppositely along an elastic extension direction of the first elastic part (41), and the elastic extension direction of the first elastic part (41) is parallel to or the same as an axial direction of the communication passage (31); the second end of the first elastic part (41) is fixed oppositely to a passage wall of the communication passage (31), and the first end of the first elastic part (41) is connected to or abuts against the first movable part (42).

5. The pump body assembly of claim 1, wherein, The first exhaust passage (52) has a second opening (521), and the second movable assembly is located at one side of the second opening (521) close to the pump body external component, so that when the air pressure in the pump body external component is greater than the air pressure in the rear-stage cylinder (20), the second movable part (62) abuts at the second opening (521) to block the second opening (521); and when the air pressure in the rear-stage cylinder (20) is greater than the air pressure in the pump body external component, the second movable part (62) is away from the second opening (521) to make the second opening (521) in an open state.

6. The pump body assembly according to claim 5, wherein, The first exhaust passage (52) comprises a fifth passage section (522) and a sixth passage section (523), a first end of the fifth passage section (522) is communicated with the interior of the rear-stage cylinder (20), a second end of the fifth passage section (522) is communicated with a first end of the sixth passage section (523), a second end of the sixth passage section (523) extends to the outer peripheral wall of the partition plate (50); a cross section of the second end of the fifth passage section (522) is smaller than a cross section of the first end of the sixth passage section (523), so that the second port of the fifth passage section (522) forms the second opening (521); the second movable assembly is arranged in the sixth passage section (523); or, The first exhaust passage (52) is provided with a second stop portion (53), and the second opening (521) is arranged on the second stop portion (53).

7. The pump body assembly of claim 6, wherein, The second movable assembly further comprises a second elastic member (61), the second elastic member (61) has a first end and a second end arranged oppositely along an elastic extension direction of the second elastic member (61), the elastic extension direction of the second elastic member (61) is parallel to or the same as the axial direction of the first exhaust passage (52); the second end of the second elastic member (61) is fixed oppositely to a passage wall of the first exhaust passage (52), and the first end of the second elastic member (61) is connected to or abuts against the second movable member (62).

8. The pump body assembly of claim 7, wherein, The fifth passage section (522) comprises a seventh passage section (524) and an eighth passage section (525), a first end of the seventh passage section (524) is the first end of the fifth passage section (522), a second end of the seventh passage section (524) is communicated with a first end of the eighth passage section (525), and a second end of the eighth passage section (525) is the second end of the fifth passage section (522); a cross section of the sixth passage section (523) is larger than a cross section of the eighth passage section (525), and the cross section of the eighth passage section (525) is larger than a cross section of the seventh passage section (524).

9. A rotary compressor characterized by The pump body assembly comprises the pump body assembly according to any one of claims 1 to 8.

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