Variable-capacity compressor and air conditioner

Abstract

The variable-capacity compressor comprises a second air cylinder and a second flange, a pin hole is formed in the second flange, a first pin valve is arranged in the pin hole, one end of the pin hole is connected with a variable-capacity cavity, a first pressure relief channel and a pin valve mounting hole are formed in the first pin valve, the first pressure relief channel is communicated with the variable-capacity cavity, and the pin valve mounting hole is communicated with the second air cylinder. The second pin valve is arranged in the pin valve mounting hole, one end of the second pin valve is relatively communicated with the first pressure relief channel so as to bear the pressure in the variable volume cavity, and the other end of the second pin valve can introduce the pressure in a shell cavity of the compressor to serve as back pressure, and the second flange is provided with a second pressure relief channel; one end of the second pressure relief channel communicates with a shell cavity of the compressor, and the other end of the second pressure relief channel can communicate with the variable volume cavity through the pin valve mounting hole and the first pressure relief channel so that pressure relief can be conducted on the variable volume cavity. According to the invention, the problems of noise, jittering and the like generated when the variable-capacity compressor is started after long-time low-temperature standing can be solved.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology, specifically relating to a variable capacity compressor and an air conditioner. Background Technology

[0002] Scroll compressors have significant advantages such as small size and simple structure, and are widely used in residential air conditioners and multi-split air conditioning systems. In multi-split air conditioning applications, one outdoor unit connects to multiple indoor units simultaneously. When all indoor units are running, a large cooling capacity is required, and the outdoor unit operates at full load; when only one indoor unit is running, a small cooling capacity is required, and the outdoor unit operates at low load. Given the large load variations characteristic of multi-split air conditioning systems, inverter technology can meet the needs to some extent. However, when the indoor units are small, the compressor may still experience a cooling capacity surplus even when operating at its lower frequency limit. This leads to frequent compressor start-stop cycles, resulting in large fluctuations in indoor temperature and increased power consumption.

[0003] Based on the use of variable frequency technology in the rolling rotor compressor, a selectively operating variable displacement cylinder is installed on the pump body. When a small load is required, the variable displacement cylinder does not work; when a large load is required, the variable displacement cylinder works. This significantly reduces the minimum load of the unit and improves the problem of frequent start-stop when the unit is operating under relatively low load conditions, such as when only one indoor unit is running.

[0004] Under normal operating conditions, pressure pulsations within the variable-capacity chamber of a residential multi-split air conditioning unit have no impact on operational stability. However, after the outdoor unit has been placed in low-temperature conditions for an extended period, the refrigerant inside the unit changes from a gaseous state to a liquid state. When the unit is turned on, a large amount of liquid refrigerant is drawn into the compressor and guided into the variable-capacity chamber through the variable-capacity port. Due to the incompressible nature of liquid refrigerant, the pressure within the variable-capacity chamber changes drastically with the reciprocating motion of the second vane, causing the compressor to vibrate violently and generate noise. This severely affects the safe operation of the unit and the comfort of its users.

[0005] Because existing variable capacity compressors have technical problems such as noise and vibration when started after being left to stand at low temperatures for a long time, this invention studies and designs a variable capacity compressor and an air conditioner. Summary of the Invention

[0006] Therefore, the present invention provides a variable capacity compressor and an air conditioner, which can solve the technical problem that variable capacity compressors in the prior art are prone to noise and vibration when started after being left to stand at low temperature for a long time.

[0007] To address the above problems, the present invention provides a variable displacement compressor, comprising:

[0008] A second cylinder and a second flange are provided. The second cylinder is equipped with a second sliding vane and a variable displacement cavity. The tail end of the second sliding vane communicates with the variable displacement cavity.

[0009] The second flange is connected to one axial end of the second cylinder. A pin hole is provided on the second flange, and a first pin valve is provided in the pin hole. One end of the pin hole is connected to the variable displacement cavity. The first pin valve has a first pressure relief channel and a pin valve mounting hole inside. The first pressure relief channel communicates with the variable displacement cavity. The second pin valve is provided in the pin valve mounting hole. One end of the second pin valve is connected to the first pressure relief channel to withstand the pressure in the variable displacement cavity. The other end of the second pin valve can introduce the pressure in the compressor housing chamber as back pressure. A second pressure relief channel is provided on the second flange. One end of the second pressure relief channel communicates with the compressor housing chamber. The other end of the second pressure relief channel can communicate with the variable displacement cavity through the pin valve mounting hole and the first pressure relief channel to relieve pressure in the variable displacement cavity.

[0010] In some implementations...

[0011] The first pressure relief channel extends from one end of the first pin valve toward the interior of the first pin valve, and the second pressure relief channel extends from the outer peripheral wall of the second flange toward the interior of the second flange to communicate with the pin hole. The first pin valve is provided with a lateral pressure relief hole, the radial inner end of the lateral pressure relief hole is opposite to and communicates with the pin valve mounting hole, and the radial outer end of the lateral pressure relief hole is opposite to and communicates with the second pressure relief channel.

[0012] In some implementations...

[0013] The first pin valve has a columnar structure, the first pressure relief channel extends along the axial direction of the first pin valve, the lateral pressure relief hole extends along the radial direction of the first pin valve, and there are multiple lateral pressure relief holes, which are spaced apart along the circumferential direction of the first pin valve.

[0014] The outer peripheral wall of the first pin valve is also provided with an annular groove, which is connected to and communicates with the radial outer ends of the plurality of lateral pressure relief holes.

[0015] In some implementations...

[0016] When the second pin valve moves to be opposite to the side pressure relief hole, it can block the side pressure relief hole, thereby disconnecting the first pressure relief channel and the second pressure relief channel. When the second pin valve moves to not be opposite to the side pressure relief hole, the second pin valve does not block the side pressure relief hole, so that the variable displacement cavity can be sequentially connected with the first pressure relief channel, the pin valve mounting hole, the side pressure relief hole and the second pressure relief channel, so as to release the fluid in the variable displacement cavity into the compressor housing chamber.

[0017] In some implementations...

[0018] It also includes a cover plate, on which a back pressure channel is provided. The second pin valve includes a first end and a second end that are opposite to each other. The first end is opposite to the first pressure relief channel so as to withstand the pressure of the variable volume cavity, and the second end is opposite to the back pressure channel so as to withstand the pressure of the shell chamber.

[0019] One end of the back pressure channel is connected to the pin valve mounting hole, and the other end of the back pressure channel is connected to the housing chamber, so that the pressure inside the housing chamber can be introduced into the pin valve mounting hole and act on the second end of the second pin valve.

[0020] In some implementations...

[0021] The second pin valve has an elastic element mounting hole on one end face facing the cover plate. A first elastic element can be installed in the elastic element mounting hole. One end of the first elastic element is installed in the elastic element mounting hole, and the other end of the first elastic element abuts against the cover plate. The first elastic element can apply an elastic force to the second pin valve in the direction of the first pressure relief channel.

[0022] In some implementations...

[0023] The pin valve mounting hole is connected to the first pressure relief channel along the axial direction of the first pin valve, and the inner diameter of the pin valve mounting hole is larger than the inner diameter of the first pressure relief channel, so as to form a first stepped surface at the junction of the two.

[0024] When the second pin valve moves to abut against the first stepped surface, the first pressure relief channel and the pin valve mounting hole are disconnected; when the second pin valve moves to a position where it is not abutting against the first stepped surface, the first pressure relief channel and the pin valve mounting hole can be connected.

[0025] In some implementations...

[0026] The second cylinder is located at the upper end of the second flange. The upper end of the second pin valve is the first end, which can withstand the downward pressure F1 in the variable displacement cavity. The lower end of the second pin valve is the second end, which can withstand the upward pressure F2 applied to it in the back pressure channel. The pressure in the back pressure channel is equal to the pressure in the housing chamber. The second pin valve also withstands the upward elastic force G applied to it by the first elastic element.

[0027] When the force on the second pin valve is F1 < F2 + G, the second pin valve can move upward to contact the first step surface and close the connection between the variable displacement cavity and the shell chamber. When the force on the second pin valve is F1 > F2 + G, the second pin valve can move downward to the pin valve mounting hole and the lateral pressure relief hole, and open the connection between the variable displacement cavity and the shell chamber, so that the variable displacement cavity can release fluid pressure into the shell chamber through the first pressure relief channel, the pin valve mounting hole, the lateral pressure relief hole and the second pressure relief channel.

[0028] In some implementations...

[0029] The first pin valve includes a first shaft segment and a second shaft segment. The outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment. A second stepped surface is formed at the junction of the outer periphery of the first shaft segment and the outer periphery of the second shaft segment. The first shaft segment is closer to the second cylinder than the second shaft segment, and a second elastic element is sleeved on the outer periphery of the first shaft segment. One end of the second elastic element is connected to the second stepped surface. The pin hole includes a first section hole and a second section hole connected along its axial direction. The first section hole is closer to the second cylinder than the second section hole. The inner diameter of the first section hole is smaller than the inner diameter of the second section hole, so that a third stepped surface is formed at the junction of the two. The other end of the second elastic element is connected to the third stepped surface, so that the second elastic element can apply an elastic force toward the cover plate direction to the first pin valve.

[0030] In some implementations...

[0031] The second cylinder is also provided with a variable displacement port and a connecting channel. The variable displacement port is opened from the radial outer end of the second cylinder toward the inside. The variable displacement port and the variable displacement cavity are located at different circumferential positions on the second cylinder. The variable displacement port and the variable displacement cavity are connected through the connecting channel. The variable displacement port can be connected to fluids of different pressures outside the variable displacement compressor, so that the second pin valve closes the connection between the first pressure relief channel and the second pressure relief channel. At this time, the second sliding vane and the second roller are not in contact. Alternatively, the second pin valve can open the connection between the first pressure relief channel and the second pressure relief channel to relieve pressure on the variable displacement cavity. At this time, the second sliding vane and the second roller are in contact.

[0032] The present invention also provides an air conditioner comprising the aforementioned variable capacity compressor.

[0033] The variable capacity compressor and air conditioner provided by this invention have the following beneficial effects:

[0034] This invention provides a first pin valve by setting a pin hole on the second flange, within which a first pressure relief channel is provided. This first pin valve connects to the variable displacement chamber on the second cylinder (the variable displacement chamber is the chamber connected to the tail of the second vane, used to drive whether the second vane connects with the second roller to achieve variable displacement). Simultaneously, a second pin valve is installed in the pin valve mounting hole of the first pin valve. The first end of the pressure relief valve faces the first pressure relief channel to bear the pressure of the variable displacement chamber, while the second end of the second pin valve faces the back pressure channel. The back pressure channel introduces the pressure of the housing chamber to act on the second end, thus making the second end of the second pin valve bear the pressure of the housing chamber. Therefore, the second pin valve will automatically move according to the pressure of the variable displacement chamber and the housing chamber respectively. Specifically, it can open the connection between the first and second pressure relief channels when the pressure in the variable displacement chamber is greater than the pressure in the housing chamber, achieving automatic pressure relief of the variable displacement chamber. This allows the pressure relief valve to automatically open when the pressure in the variable displacement chamber is high and automatically close when the pressure in the variable displacement chamber is low, solving the problem of pressure buildup during startup of a variable displacement compressor after a long period of low-temperature static storage. This invention addresses issues such as noise and vibration. Compared to existing riveted exhaust valve plates, this invention offers improved reliability against abnormal liquid pressure, preventing the free end of the thin-arm riveted valve plate from repeatedly vibrating under high-pressure airflow pulsation. It effectively improves stability during pressure relief, preventing noise or vibration caused by vibration, and offers faster response and superior timeliness in opening and closing. It effectively solves the technical problem of vibration caused by riveted exhaust valve plates in existing compressors. Furthermore, the second end of the second pin valve in this invention introduces the pressure from inside the housing. Compared to existing solutions that introduce pressure from inside the cylinder, where the cylinder pressure is typically lower than the housing pressure, applying this to the second pin valve would cause premature valve opening, leading to backflow of fluid within the housing and preventing effective pressure relief. Therefore, this invention achieves stable pressure relief, prevents vibration, offers faster response, and provides more precise pressure relief compared to various existing solutions. Moreover, this invention eliminates the need for additional piping for pressure relief, reducing compressor manufacturing costs and size. Attached Figure Description

[0035] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0036] Figure 1 This is a longitudinal sectional view of the variable displacement compressor of the present invention at two air intake ports;

[0037] Figure 2 This is a longitudinal sectional view of the variable displacement compressor of the present invention at the variable displacement port;

[0038] Figure 3 yes Figure 1 Top view of the internal structure of the first compression component;

[0039] Figure 4 yes Figure 1 Top view of the internal structure of the second compression component;

[0040] Figure 5 This is a longitudinal sectional view of the pump body when the variable displacement cylinder of the present invention is in working state 1 (when working state 1, the pressure in the variable displacement chamber is high pressure and the pressure is higher than the exhaust pressure, at which time the second pin valve opens to release pressure).

[0041] Figure 6 This is a longitudinal sectional view of the pump body when the variable displacement cylinder of the present invention is in working state 2 (when working state 2, the pressure in the variable displacement chamber is high pressure, but this pressure is lower than the exhaust pressure, at which time the second pin valve is closed to release pressure).

[0042] Figure 7 This is a longitudinal sectional view of the pump body when the variable displacement cylinder of the present invention is in the stopped working state (when the variable displacement chamber is in the stopped working state, the pressure is introduced into the low pressure chamber, and at this time both the first and second pin valves move upward to close the pressure relief passage).

[0043] Figure 8 These are longitudinal sectional views and perspective views of the first pin valve of the present invention;

[0044] Figure 9 These are perspective and longitudinal sectional views of the second pin valve of the present invention.

[0045] The attached figures are labeled as follows:

[0046] 1. First cylinder; 2. Second cylinder; 3. Baffle; 4. Second vane; 5. Variable displacement cavity; 6. First pressure relief channel; 7. Pin hole; 8. Second pressure relief channel; 9. Housing chamber; 10. First pin valve; 11. First end; 12. Second end; 13. Back pressure channel; 14. Second pin valve; 15. First flange; 16. Variable displacement port; 17. Connecting channel; 18. Second roller; 19. First intake port; 20. Second intake port; 21. Crankshaft; 22. 23. First roller; 24. First sliding vane; 25. Pin valve mounting hole; 26. First elastic element; 27. Second elastic element; 28. Housing; 29. ​​Vent port; 20. Second flange; 31. Dispenser; 32. Lateral pressure relief hole; 33. Annular groove; 34. First stepped surface; 35. Cover plate; 36. Second stepped surface; 37. Elastic element mounting hole; 38. First sealing surface; 39. Second sealing surface; 40. Third sealing surface. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0049] 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.

[0050] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0051] See also Figure 1-9 As shown, according to an embodiment of the present invention, a variable displacement compressor is provided, comprising:

[0052] The second cylinder 2 and the second flange 29 are provided. The second cylinder 2 is equipped with a second sliding plate 4 and a variable displacement cavity 5. The tail of the second sliding plate 4 is connected to the variable displacement cavity 5.

[0053] The second flange 29 is connected to one axial end of the second cylinder 2. The second flange 29 is provided with a pin hole 7, in which a first pin valve 10 and a second pin valve 14 are provided. One end of the pin hole 7 is connected to the variable displacement cavity 5. The first pin valve 10 has a first pressure relief channel 6 and a pin valve mounting hole 24 inside. The first pressure relief channel 6 communicates with the variable displacement cavity 5. The second pin valve 14 is provided in the pin valve mounting hole 24. One end of the second pin valve 14 is connected to the first pressure relief channel 6 to withstand the pressure in the variable displacement cavity 5. The other end of the second pin valve 14 can introduce the pressure in the compressor housing chamber 9 as back pressure. The second flange 29 is provided with a second pressure relief channel 8. One end of the second pressure relief channel 8 communicates with the compressor housing chamber 9. The other end of the second pressure relief channel 8 can communicate with the variable displacement cavity 5 through the pin valve mounting hole 24 and the first pressure relief channel 6 to relieve pressure in the variable displacement cavity 5.

[0054] This invention provides a first pin valve by setting a pin hole on the second flange, within which a first pressure relief channel is provided. This first pin valve connects to the variable displacement chamber on the second cylinder (the variable displacement chamber is the chamber connected to the tail of the second vane, used to drive whether the second vane connects with the second roller to achieve variable displacement). Simultaneously, a second pin valve is installed in the pin valve mounting hole of the first pin valve. The first end of the pressure relief valve faces the first pressure relief channel to bear the pressure of the variable displacement chamber, while the second end of the second pin valve faces the back pressure channel. The back pressure channel introduces the pressure of the housing chamber to act on the second end, thus making the second end of the second pin valve bear the pressure of the housing chamber. Therefore, the second pin valve will automatically move according to the pressure of the variable displacement chamber and the housing chamber respectively. Specifically, it can open the connection between the first and second pressure relief channels when the pressure in the variable displacement chamber is greater than the pressure in the housing chamber, achieving automatic pressure relief of the variable displacement chamber. This allows the pressure relief valve to automatically open when the pressure in the variable displacement chamber is high and automatically close when the pressure in the variable displacement chamber is low, solving the problem of pressure buildup during startup of a variable displacement compressor after a long period of low-temperature static storage. This invention addresses issues such as noise and vibration. Compared to existing riveted exhaust valve plates, this invention offers improved reliability against abnormal liquid pressure, preventing the free end of the thin-arm riveted valve plate from repeatedly vibrating under high-pressure airflow pulsation. It effectively improves stability during pressure relief, preventing noise or vibration caused by vibration, and offers faster response and superior timeliness in opening and closing. It effectively solves the technical problem of vibration caused by riveted exhaust valve plates in existing compressors. Furthermore, the second end of the second pin valve in this invention introduces the pressure from inside the housing. Compared to existing solutions that introduce pressure from inside the cylinder, where the cylinder pressure is typically lower than the housing pressure, applying this to the second pin valve would cause premature valve opening, leading to backflow of fluid within the housing and preventing effective pressure relief. Therefore, this invention achieves stable pressure relief, prevents vibration, offers faster response, and provides more precise pressure relief compared to various existing solutions. Moreover, this invention eliminates the need for additional piping for pressure relief, reducing compressor manufacturing costs and size.

[0055] This invention solves the following technical problems:

[0056] 1. It solves the problems of noise and vibration generated when starting up a variable capacity compressor after a long period of low-temperature static storage; it also solves the technical problem that the use of riveted exhaust valve plates in existing compressors can cause vibration.

[0057] 2. Avoid introducing pressure into the cylinder body as back pressure, which could cause fluid diversion within the housing and prevent normal pressure relief.

[0058] 3. When conventional two-stage (enthalpy-increasing) compressors and systems using them are left stagnant for a long time in low-temperature environments (especially ultra-low temperature environments below -20℃), or when the system load changes significantly or the evaporator heat exchange is poor, liquid slugging can cause a sudden increase in the pressure of the intermediate-pressure chamber, which in turn can lead to overpressure tripping of the secondary compression chamber, affecting the stable operation of the system.

[0059] 4. Existing pressure relief technology solutions that involve setting external pipelines and differential pressure control valves require additional system pipelines and control valves, which increases manufacturing costs and makes the pipeline layout more complex, thus affecting the overall heating performance and system reliability.

[0060] In some implementations...

[0061] The first pressure relief channel 6 extends from one end of the first pin valve 10 toward the interior of the first pin valve 10, and the second pressure relief channel 8 extends from the outer peripheral wall of the second flange 29 toward the interior of the second flange 29 to communicate with the pin hole 7. The first pin valve 10 is provided with a lateral pressure relief hole 31. The radial inner end of the lateral pressure relief hole 31 is opposite to and communicates with the pin valve mounting hole 24, and the radial outer end of the lateral pressure relief hole 31 is opposite to and communicates with the second pressure relief channel 8.

[0062] This is a preferred structural form of the first pressure relief channel of the present invention, namely, a channel extending inward on the first pin valve, which can connect the variable volume cavity with the pin valve mounting hole, and the lateral pressure relief hole on the first pin valve can connect the pin valve mounting hole with the second pressure relief channel. Then, the movement of the second pin valve can open or close the lateral pressure relief hole, so as to achieve the purpose and effect of opening the lateral pressure relief hole for pressure relief when the pressure is high and closing the pressure relief when the pressure is low.

[0063] In some implementations...

[0064] The first pin valve 10 has a columnar structure, the first pressure relief channel 6 extends along the axial direction of the first pin valve 10, the lateral pressure relief hole 31 extends along the radial direction of the first pin valve 10, and there are multiple lateral pressure relief holes 31, which are spaced apart along the circumferential direction of the first pin valve 10.

[0065] The outer peripheral wall of the first pin valve 10 is also provided with an annular groove 32, which is connected to and communicates with the radial outer ends of the plurality of lateral pressure relief holes 31.

[0066] This is a preferred structural form of the first pin valve, the first pressure relief channel, and the lateral pressure relief holes of the present invention. The multiple lateral pressure relief holes arranged at circumferential intervals can increase the pressure relief flow area and improve the pressure relief effect. Furthermore, the annular groove provided on the outer peripheral wall of the first pin valve can achieve the function of stabilizing pressure, increase the flow area, further increase the pressure relief flow, and improve the pressure relief effect.

[0067] In some implementations...

[0068] When the second pin valve 14 moves to be opposite to the lateral pressure relief hole 31, it can block the lateral pressure relief hole 31, thereby disconnecting the first pressure relief channel 6 and the second pressure relief channel 8. When the second pin valve 14 moves to not be opposite to the lateral pressure relief hole 31, the second pin valve 14 does not block the lateral pressure relief hole 31 (see...). Figure 5 The second pin valve 14 is vertically offset from the lateral pressure relief hole 31, so that the variable volume cavity 5 can be sequentially connected to the first pressure relief channel 6, the pin valve mounting hole 24, the lateral pressure relief hole 31 and the second pressure relief channel 8, so as to relieve the fluid in the variable volume cavity 5 to the housing chamber 9 of the compressor.

[0069] This describes the preferred relationship between the movement state of the second pin valve and the connection between the first and pressure relief channels in this invention. Specifically, when the second pin valve moves to the position of blocking the lateral pressure relief hole, the connection between the first and second pressure relief channels is effectively closed, and no pressure is released. Conversely, when the pressure relief valve moves to the position of not blocking the lateral pressure relief hole, the connection between the first and second pressure relief channels is effectively opened, allowing the fluid in the variable displacement cavity to be released into the housing chamber through the first and pressure relief channels.

[0070] In some implementations...

[0071] It also includes a cover plate 34, on which a back pressure channel 13 is provided. The second pin valve 14 includes a first end 11 and a second end 12 facing away from each other. The first end 11 is opposite to the first pressure relief channel 6 so as to withstand the pressure of the variable volume cavity 5, and the second end 12 is opposite to the back pressure channel 13 so as to withstand the pressure of the shell chamber 9.

[0072] One end of the back pressure channel 13 is connected to the pin valve mounting hole 24, and the other end of the back pressure channel 13 is connected to the housing chamber 9, so that the pressure in the housing chamber 9 can be introduced into the pin valve mounting hole 24 and act on the second end 12 of the second pin valve 14.

[0073] This is a preferred structural form of the back pressure channel of the present invention. The back pressure channel is provided on the cover plate provided on the end face of the second flange away from the second cylinder. It can communicate with the housing chamber to effectively introduce fluid (e.g., exhaust gas) from the housing chamber into the back pressure channel, and then act on the second end of the second pin valve to realize the purpose of the second pin valve automatically opening and closing the pressure relief channel according to the pressure of the variable volume chamber and the pressure of the housing chamber.

[0074] In some implementations...

[0075] The second pin valve 14 has an elastic element mounting hole 37 on one end face facing the cover plate 34. A first elastic element 25 can be installed in the elastic element mounting hole 37. One end of the first elastic element 25 is installed in the elastic element mounting hole 37, and the other end of the first elastic element 25 abuts against the cover plate 34. The first elastic element 25 can apply an elastic force to the second pin valve 14 in the direction of the first pressure relief channel 6.

[0076] This is a preferred structural form of the second pin valve of the present invention. By providing an elastic element mounting hole and a first elastic element, an elastic restoring force can be provided to the second pin valve in the direction of the first pressure relief channel. This enables the second pin valve to have the force to move in the direction of the first pressure relief channel to close the pressure relief channel. The connection between the first and second pressure relief channels is automatically opened or closed according to the magnitude of the pressure at both ends of the second pin valve and the magnitude of the elastic force. In the automatic pressure relief process, the upper end of the second pin valve bears the pressure of the variable volume cavity, and the lower end of the second pin valve bears the pressure of the shell cavity. The elastic force on the second pin valve of the present invention is G. Since its elastic force is relatively small compared to the pressure above and below, it can be ignored. Therefore, the effect of automatically opening the pressure relief channel to relieve pressure in the variable volume cavity or closing the pressure relief can be achieved according to the pressure relationship between the variable volume cavity and the shell cavity.

[0077] In some implementations...

[0078] The pin valve mounting hole 24 is connected to the first pressure relief channel 6 along the axial direction of the first pin valve 10, and the inner diameter of the pin valve mounting hole 24 is larger than the inner diameter of the first pressure relief channel 6, so as to form a first stepped surface 33 at the junction of the two.

[0079] When the second pin valve 14 moves to abut against the first stepped surface 33, the first pressure relief channel 6 and the pin valve mounting hole 24 are disconnected; when the second pin valve 14 moves to a position where it is not abutting against the first stepped surface 33 (see...), Figure 5 (The upper end of the second pin valve 14 is spaced more than 0 from the first step surface 33), and the first pressure relief channel 6 and the pin valve mounting hole 24 can form a connection.

[0080] This is a preferred structural form of the pin valve mounting hole of the present invention. The first stepped surface can limit the second pin valve and at the same time close the lateral pressure relief hole.

[0081] In some implementations...

[0082] The second cylinder 2 is located at the upper end of the second flange 29. The upper end of the second pin valve 14 is the first end 11, which can withstand the downward pressure F1 in the variable displacement cavity 5. The lower end of the second pin valve 14 is the second end 12, which can withstand the upward pressure F2 applied to it in the back pressure channel 13. The pressure in the back pressure channel 13 is equal to the pressure in the housing chamber 9. The second pin valve 14 also withstands the upward elastic force G applied to it by the first elastic element 25.

[0083] When the force on the second pin valve 14 is F1 < F2 + G, the second pin valve 14 can move upward to connect with the first step surface 33, and close the connection between the variable displacement cavity 5 and the housing chamber 9 through the second pin valve 14; when the force on the second pin valve 14 is F1 > F2 + G, the second pin valve 14 can move downward to connect the pin valve mounting hole 24 with the lateral pressure relief hole 31, and open the connection between the variable displacement cavity 5 and the housing chamber 9 through the second pin valve 14, so that the variable displacement cavity 5 releases fluid pressure into the housing chamber 9 through the first pressure relief channel 6, the pin valve mounting hole 24, the lateral pressure relief hole 31 and the second pressure relief channel 8.

[0084] This invention's second pin valve further automatically opens or closes the connection between the first and second pressure relief channels based on the magnitude of the pressure at both ends and the magnitude of the elastic force, thus automatically relieving pressure. Specifically, the upper end of the second pin valve bears the pressure of the variable displacement cavity, and the lower end of the pressure relief valve bears the pressure of the shell chamber. The elastic force of the first elastic element in this invention is G. Since its elastic force is relatively small compared to the pressure above and below, it can be ignored. Preferably, when F1 < F2 + G, the pressure in the variable displacement cavity is not very large. At this time, the second pin valve connects with the first step surface to close the lateral pressure relief hole, and no pressure is relieved. Preferably, when F1 > F2 + G, the pressure in the variable displacement cavity is large. At this time, the second pin valve is automatically pushed downward to open the lateral pressure relief hole, achieving automatic pressure relief. Therefore, it can achieve the effect of automatically opening the pressure relief channel to relieve pressure in the variable displacement cavity or closing the pressure relief based on the pressure relationship between the variable displacement cavity and the shell chamber.

[0085] In some implementations...

[0086] The first pin valve 10 includes a first shaft segment and a second shaft segment. The outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment. A second stepped surface 35 is formed at the junction of the outer periphery of the first shaft segment and the outer periphery of the second shaft segment. The first shaft segment is closer to the second cylinder 2 relative to the second shaft segment, and a second elastic element 26 is sleeved on the outer periphery of the first shaft segment. One end of the second elastic element 26 is connected to the second stepped surface 35. The pin hole 7 includes a first section hole and a second section hole connected along its axial direction. The first section hole is closer to the second cylinder 2 relative to the second section hole. The inner diameter of the first section hole is smaller than the inner diameter of the second section hole, so that a third stepped surface 36 is formed at the junction of the two. The other end of the second elastic element 26 is connected to the third stepped surface 36, so that the second elastic element 26 can apply an elastic force to the first pin valve 10 in the direction of the cover plate 34.

[0087] This invention provides a high-pressure fluid relief passage on the second flange of the variable displacement compressor near the second compression assembly. This passage includes an axial pressure relief hole (first pressure relief channel 6) on the first pin valve, a lateral pressure relief hole 31, a pressure relief groove (annular groove 32), and a second pressure relief channel on the second flange. When the second compression assembly is in operation, if the pressure in the variable displacement chamber is high, the high-pressure fluid relief passage opens to suppress the pressure rise in the variable displacement chamber, preventing severe vibration and noise problems in the compressor under extreme operating conditions. If the pressure in the variable displacement chamber drops to a level sufficient to overcome the elastic force of the first elastic element 25, the high-pressure fluid relief passage closes, preventing fluid from the housing from entering the variable displacement chamber through the high-pressure relief passage (operating state 2, such as...). Figure 6 To avoid interference from the first pin valve during the normal operation of the second slide plate, the elastic force of the first elastic element 25 must be less than that of the second elastic element 26.

[0088] When the second compression assembly stops working, the high-pressure fluid relief passage is closed by the second pin valve 14, and the second vane is constrained in the vane groove of the second cylinder by the first pin valve 10. Due to the sealing effect of the first pin valve 10 and the second pin valve 14, the problem of reduced compressor performance caused by high and low pressure leakage is avoided.

[0089] In some implementations...

[0090] The second cylinder 2 is also provided with a variable displacement port 16 and a connecting channel 17. The variable displacement port 16 opens from the radially outer end of the second cylinder 2 inward. The variable displacement port 16 and the variable displacement cavity 5 are located at different circumferential positions on the second cylinder 2. The variable displacement port 16 and the variable displacement cavity 5 are connected through the connecting channel 17. The variable displacement port 16 can be connected to different external pressures of the variable displacement compressor, so that the second pin valve 14 closes the connection between the first pressure relief channel 6 and the second pressure relief channel 8 to prevent pressure relief from the variable displacement cavity 5. At this time, the second sliding vane 4 and the second roller 18 are not in contact (see...). Figure 6 ), or cause the second pin valve 14 to open the connection between the first pressure relief channel 6 and the second pressure relief channel 8 to relieve pressure on the variable displacement cavity 5, at which time the second sliding plate 4 is in contact with the second roller 18 (see Figure 5 ).

[0091] This is a further preferred structural form of the second cylinder of the present invention. Through the variable displacement port and the connecting channel, fluid can be introduced from outside the compressor and enter the variable displacement chamber. The pressure relief valve is automatically opened or closed according to the relationship between the pressure and the pressure in the housing. The second sliding vane is automatically driven to engage with the second roller according to the relationship between the pressure and the pressure in the compression chamber, so as to realize the variable displacement operation of compression or non-compression. While realizing variable displacement control, it can also effectively relieve pressure in the variable displacement chamber, preventing noise, vibration and other issues that may occur when the compressor is started after being left to stand at low temperature for a long time.

[0092] The present invention relates to a compressor structure: This invention relates to a rolling rotor compressor, comprising a distributor 30, a housing 27, a motor, and a pump body. The distributor 30 is disposed outside the housing 27, the motor is sleeved on the upper part of the housing 27, and the pump body is sleeved inside the housing 27 and located below the motor. The pump body includes a first flange 15, a second flange 29, a first compression section, a second compression section, a partition plate (partition plate 3), and a crankshaft 21. The crankshaft 21 is sequentially sleeved on the motor rotor, the first flange 15, the first roller 22, the partition plate 3, the second roller 18, and the second flange 29. The first compression section includes a first cylinder 1, a first roller 22, and a first vane 23. The first roller 22 is sleeved on the crankshaft 21 and located inside the first cylinder 1. The first vane 23 is disposed in a vane groove of the first cylinder 1, one end of which abuts against the outer circle of the first roller 22, dividing the first cylinder 1 into an intake chamber and a compression chamber, and the other end communicates with the high pressure inside the housing. The second compression section includes a second cylinder 2, a second roller 18, and a second vane 4. The second roller 18 is sleeved on the crankshaft and located inside the second cylinder 2. The second vane 4 is disposed in the vane groove of the second cylinder 2, with one end abutting against the outer circle of the second roller 18, dividing the first cylinder 1 into an intake chamber and a compression chamber. The other end is surrounded by a partition plate, a second flange 29, and the second cylinder 2 to form a variable-volume chamber isolated from the high pressure inside the housing. The partition plate is located between the first and second compression sections. The refrigerant passes through the liquid separator intake port, the first intake port 19, and the second intake port 20 through the housing and communicates with the intake ports of the first cylinder 1 and the second cylinder 2 respectively (the two cylinders are preferably connected in parallel).

[0093] The second compression assembly operates as follows: When high-pressure refrigerant is introduced into the variable-capacity cavity through the variable-capacity port, the second vane 4 abuts against the second roller 18. Driven by the motor rotor, the crankshaft simultaneously drives the first roller 22 and the second roller 18 to rotate. The first and second compression sections respectively draw in refrigerant, compress it, and discharge it into the housing and through the exhaust pipe.

[0094] The second compression assembly is in a stopped state: When low-pressure refrigerant is introduced into the variable-capacity cavity through the variable-capacity port, the second vane 4 is pushed into the vane slot of the second cylinder 2 by the second roller 18. Driven by the motor rotor, the crankshaft simultaneously drives the first roller and the second roller 18 to rotate. The first compression section draws in refrigerant, compresses it, and discharges it into the housing and out through the exhaust pipe. In the second compression section, the vane and roller are separated, and the process of drawing in refrigerant and compressing it cannot take place; at this time, the second compression section is not working.

[0095] Technical features of the present invention: such as Figure 5As shown, a first pin valve 10, a second elastic element 26, a second pin valve 14, and a first elastic element 25 are respectively provided on the second flange located below the second sliding plate. The first pin valve 10 is movably disposed in a hole in the lower flange. The second elastic element 26 is sleeved on the protrusion of the first pin valve 10 and located near the second sliding plate 4. The second elastic element 26 has a force that moves the first pin valve 10 away from the second sliding plate 4. The second pin valve 14 is movably disposed in the pin valve mounting hole 24 in the first pin valve 10. One end of the first elastic element 25 is disposed in the elastic element mounting hole 37 on the second pin valve 14, and the other end abuts against the cover plate adjacent to the second flange 29. It has a force that pushes the second pin valve 14 towards the second sliding plate 4. A high-pressure inlet hole (back pressure channel) is provided on the cover plate below the first elastic element 25.

[0096] Pressure relief pathways: such as Figure 8 As shown, an axial pressure relief hole (first pressure relief channel 6) is provided on the first pin valve 10, one end of which communicates with the variable displacement cavity, and the other end communicates with the pin valve mounting hole 24. An annular groove 32 is provided on the sealing surface of the first pin valve 10, and a lateral pressure relief hole 31 is provided between the annular groove and the pin valve mounting hole 24. A second pressure relief channel 8 is provided on the second flange 29. The sealing surface of the first pin valve 10 has the function of isolating the fluid in the variable displacement cavity from the fluid in the high-pressure hole on the cover plate, and the sealing surface of the first pin valve 10 also has the function of isolating the fluid in the variable displacement cavity from the fluid in the second pressure relief channel 8 on the second flange 29.

[0097] When the second compression assembly is working, the high-pressure fluid relief passage in the variable volume chamber and its opening and closing process include: axial pressure relief hole, lateral pressure relief hole, pressure relief groove on the first pin valve 10, and second pressure relief channel on the second flange 29. The opening and closing process of this passage is achieved by changing the position of the first pin valve 10 and the second pin valve 14.

[0098] High-pressure fluid relief passage opening process: The variable displacement cavity is surrounded by the middle partition, the second cylinder, the second flange 29, and the second sliding plate 4 to form a sealed cavity. For example... Figure 5As shown, when high-pressure fluid is introduced into the variable displacement cavity through the variable displacement component, the pressure on the side of the first pin valve 10 near the second sliding plate 4 is equal to the pressure on the side away from the second sliding plate 4. Under the action of the elastic element, the first pin valve 10 moves towards the cover plate and abuts against it, and the second sliding plate 4 is unlocked. In addition, the pressure on the side of the second sliding plate 4 near the variable displacement cavity is higher than the pressure on the side away from the variable displacement cavity. Under the action of the pressure, one end of it abuts against the outer circle of the second roller, and the second compression assembly enters the working state. When the second sliding plate 4 reciprocates in the second cylinder, the space in the variable displacement cavity periodically increases and decreases, causing the pressure in the variable displacement cavity to exhibit a periodic fluctuation with an approximately sine or cosine law. The pressure in the variable displacement cavity is sometimes higher than the exhaust pressure in the housing and sometimes lower than the exhaust pressure in the housing. When the pressure in the variable displacement cavity is higher than the exhaust pressure in the housing and is sufficient to overcome the elastic force of the first elastic element 25, the second pin valve 14 moves towards the cover plate under the action of the pressure and abuts against the cover plate. At this time, the pressure relief channel is opened, and the high-pressure fluid in the variable volume cavity is discharged into the housing through the axial pressure relief hole, lateral pressure relief hole, pressure relief groove on the first pin valve 10, and the second pressure relief channel on the second flange 29. This reduces the pressure in the variable volume cavity and suppresses the problem of pressure rise in the variable volume cavity.

[0099] Because of the opening of this high-pressure fluid relief passage, under extreme operating conditions, such as when a large amount of liquid fluid enters the variable-volume chamber through the variable-volume component, the liquid fluid is promptly discharged from the variable-volume chamber into the housing through this high-pressure fluid relief passage when the pressure inside the variable-volume chamber rises. This avoids problems such as compressor vibration and noise.

[0100] High-pressure fluid pressure relief passage closure process: such as Figure 6 As shown, when the pressure in the variable volume chamber decreases to a level where the first elastic element 25 is sufficient to overcome the pressure acting on the second pin valve 14, the first elastic element 25 pushes the second pin valve 14 away from the cover plate until it abuts against the first stepped surface 33 of the first pin valve 10. The high-pressure fluid relief passage is closed, preventing fluid in the housing from entering the variable volume chamber through the relief passage. If the elastic force of the first elastic element 25 is too large to overcome the elasticity of the second elastic element 26 and push the second pin valve 14 and the first pin valve 10 closer to the second slide plate 4 until they abut against the second slide plate 4, the first pin valve 10 will interfere with the normal operation of the second slide plate 4, which may seriously damage the moving parts. Therefore, to avoid this problem, the elastic force of the first elastic element 25 should be less than the elastic force of the second elastic element 26.

[0101] The process of the second compression component entering a stopped working state: (e.g.) Figure 7As shown, when low-pressure fluid (pressure lower than the exhaust pressure and intake pressure) is passed into the variable-volume chamber through the variable-volume component, the pressure on the side of the second slide plate 4 near the variable-volume chamber is the same as the pressure on the side away from the variable-volume chamber. The second slide plate 4 is pushed into the slide plate groove of the second cylinder by the second roller. At the same time, the pressure on the side of the second pin valve 14 near the variable-volume chamber is less than the pressure on the side near the cover plate. Under the combined action of the pressure and the first elastic element 25, it moves away from the cover plate until it abuts against the first stepped surface on the first pin valve 10. The pressure on the side of the first pin valve 10 near the variable-volume chamber is less than the pressure on the side near the cover plate. Under the action of the pressure and the first elastic element 25, the first pin valve 10 and the second pin valve 14 overcome the elastic force of the second elastic element 26 and move towards the second slide plate 4 until the protrusion of the first pin valve 10 abuts against the second slide plate 4, constraining the second slide plate 4 in the slide plate groove of the second cylinder. The second compression assembly enters the stopped working state. The small gap between the outer circumference of the first pin valve 10 and the hole of the second flange 29 naturally forms a sealing surface, preventing the flow of low-pressure fluid near the variable displacement cavity side and high-pressure fluid away from the variable displacement cavity side of the first pin valve 10. Furthermore, under pressure, the second pin valve 14 presses tightly against the first step surface 33 on the first pin valve 10, also preventing the flow of low-pressure fluid near the variable displacement cavity side and high-pressure fluid away from the variable displacement cavity side of the second pin valve 14. This effectively suppresses the problem of reduced compressor performance caused by fluid leakage.

[0102] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features and embodiments of the above-described methods can be freely combined and superimposed.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A variable displacement compressor, characterized in that: include: The second cylinder (2) and the second flange (29) are provided with a second sliding plate (4) and a variable displacement cavity (5). The tail of the second sliding plate (4) is connected to the variable displacement cavity (5). The second flange (29) is connected to one axial end of the second cylinder (2). A pin hole (7) is provided on the second flange (29). A first pin valve (10) and a second pin valve (14) are provided in the pin hole (7). One end of the pin hole (7) is connected to the variable displacement cavity (5). The first pin valve (10) has a first pressure relief channel (6) and a pin valve mounting hole (24) inside. The first pressure relief channel (6) communicates with the variable displacement cavity (5). The second pin valve (14) is provided in the pin valve mounting hole (24). One end of the second valve (14) is connected to the first pressure relief channel (6) to withstand the pressure in the variable displacement cavity (5). The other end of the second valve (14) can introduce the pressure in the housing chamber (9) of the compressor as back pressure. The second flange (29) is provided with a second pressure relief channel (8). One end of the second pressure relief channel (8) is connected to the housing chamber (9) of the compressor. The other end of the second pressure relief channel (8) can be connected to the variable displacement cavity (5) through the pin valve mounting hole (24) and the first pressure relief channel (6) to relieve pressure on the variable displacement cavity (5).

2. The variable displacement compressor according to claim 1, characterized in that: The first pressure relief channel (6) extends from one end of the first pin valve (10) toward the interior of the first pin valve (10), and the second pressure relief channel (8) extends from the outer peripheral wall of the second flange (29) toward the interior of the second flange (29) to communicate with the pin hole (7). The first pin valve (10) is provided with a lateral pressure relief hole (31). The radial inner end of the lateral pressure relief hole (31) is opposite to and communicates with the pin valve mounting hole (24), and the radial outer end of the lateral pressure relief hole (31) is opposite to and communicates with the second pressure relief channel (8).

3. The variable displacement compressor according to claim 2, characterized in that: The first pin valve (10) has a columnar structure, the first pressure relief channel (6) extends along the axial direction of the first pin valve (10), the lateral pressure relief hole (31) extends along the radial direction of the first pin valve (10), and there are multiple lateral pressure relief holes (31), which are spaced apart along the circumferential direction of the first pin valve (10). The outer peripheral wall of the first pin valve (10) is also provided with an annular groove (32), which is connected to and communicates with the radial outer ends of the plurality of lateral pressure relief holes (31).

4. The variable displacement compressor according to claim 2, characterized in that: When the second pin valve (14) moves to be opposite to the side pressure relief hole (31), it can block the side pressure relief hole (31), so that the first pressure relief channel (6) and the second pressure relief channel (8) are disconnected. When the second pin valve (14) moves to not be opposite to the side pressure relief hole (31), the second pin valve (14) does not block the side pressure relief hole (31), so that the variable volume cavity (5) can be connected in sequence with the first pressure relief channel (6), the pin valve mounting hole (24), the side pressure relief hole (31) and the second pressure relief channel (8) to release the fluid in the variable volume cavity (5) into the housing chamber (9) of the compressor.

5. The variable displacement compressor according to claim 4, characterized in that: It also includes a cover plate (34), on which a back pressure channel (13) is provided. The second pin valve (14) includes a first end (11) and a second end (12) facing away from each other. The first end (11) is opposite to the first pressure relief channel (6) so as to withstand the pressure of the variable volume cavity (5), and the second end (12) is opposite to the back pressure channel (13) so as to withstand the pressure of the shell chamber (9). One end of the back pressure channel (13) is connected to the pin valve mounting hole (24), and the other end of the back pressure channel (13) is connected to the housing chamber (9) so that the pressure in the housing chamber (9) can be introduced into the pin valve mounting hole (24) and act on the second end (12) of the second pin valve (14).

6. The variable displacement compressor according to claim 5, characterized in that: The second pin valve (14) has an elastic element mounting hole (37) on one side of the end face facing the cover plate (34). A first elastic element (25) can be installed in the elastic element mounting hole (37). One end of the first elastic element (25) is installed in the elastic element mounting hole (37), and the other end of the first elastic element (25) abuts against the cover plate (34). The first elastic element (25) can apply an elastic force to the second pin valve (14) in the direction of the first pressure relief channel (6).

7. The variable displacement compressor according to claim 6, characterized in that: The pin valve mounting hole (24) is connected to the first pressure relief channel (6) along the axial direction of the first pin valve (10), and the inner diameter of the pin valve mounting hole (24) is larger than the inner diameter of the first pressure relief channel (6) to form a first stepped surface (33) at the junction of the two. When the second pin valve (14) moves to abut against the first step surface (33), the first pressure relief channel (6) and the pin valve mounting hole (24) are disconnected; when the second pin valve (14) moves to not abut against the first step surface (33), the first pressure relief channel (6) and the pin valve mounting hole (24) can be connected.

8. The variable displacement compressor according to claim 7, characterized in that: The second cylinder (2) is located at the upper end of the second flange (29). The upper end of the second pin valve (14) is the first end (11) so as to withstand the downward pressure F1 in the variable displacement cavity (5). The lower end of the second pin valve (14) is the second end (12). The second end (12) can withstand the upward pressure F2 applied to it in the back pressure channel (13). The pressure in the back pressure channel (13) is equal to the pressure in the housing chamber (9). The second pin valve (14) also withstands the upward elastic force G applied to it by the first elastic element (25). When the force on the second pin valve (14) is F1 < F2 + G, the second pin valve (14) can move upward to connect with the first step surface (33) and close the connection between the variable volume cavity (5) and the shell chamber (9) through the second pin valve (14); when the force on the second pin valve (14) is F1 > F2 + G, the second pin valve (14) can move downward to connect with the pin valve mounting hole (24) and the side pressure relief hole (31) respectively, and open the connection between the variable volume cavity (5) and the shell chamber (9) through the second pin valve (14), so that the variable volume cavity (5) releases fluid into the shell chamber (9) through the first pressure relief channel (6), the pin valve mounting hole (24), the side pressure relief hole (31) and the second pressure relief channel (8).

9. The variable displacement compressor according to claim 5, characterized in that: The first pin valve (10) includes a first shaft segment and a second shaft segment. The outer diameter of the first shaft segment is smaller than the outer diameter of the second shaft segment. The outer periphery of the first shaft segment and the outer periphery of the second shaft segment form a second step surface (35). The first shaft segment is closer to the second cylinder (2) relative to the second shaft segment. A second elastic element (26) is sleeved on the outer periphery of the first shaft segment. One end of the second elastic element (26) is connected to the second step surface (35). The pin hole (7) includes a first section hole and a second section hole connected along its axial direction. The first section hole is closer to the second cylinder (2) relative to the second section hole. The inner diameter of the first section hole is smaller than the inner diameter of the second section hole, so as to form a third step surface (36) at the junction of the two. The other end of the second elastic element (26) is connected to the third step surface (36), so that the second elastic element (26) can apply an elastic force to the first pin valve (10) in the direction of the cover plate (34).

10. The variable displacement compressor according to claim 1, characterized in that: The second cylinder (2) is also provided with a variable displacement port (16) and a connecting channel (17). The variable displacement port (16) is opened from the radial outer end of the second cylinder (2) toward the inside. The variable displacement port (16) and the variable displacement cavity (5) are located at different circumferential positions on the second cylinder (2). The variable displacement port (16) and the variable displacement cavity (5) are connected through the connecting channel (17). The variable displacement port (16) can be connected to fluids of different pressures outside the variable displacement compressor, so that the second pin valve (14) closes the connection between the first pressure relief channel (6) and the second pressure relief channel (8). At this time, the second sliding vane (4) and the second roller (18) are not in contact, or the second pin valve (14) opens the connection between the first pressure relief channel (6) and the second pressure relief channel (8) to relieve pressure on the variable displacement cavity (5). At this time, the second sliding vane (4) and the second roller (18) are in contact.

11. An air conditioner, characterized in that, The variable displacement compressor includes any one of claims 1-10.

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