Pump body assembly, scroll compressor and refrigeration device

Abstract

The utility model provides a kind of pump body assembly, scroll compressor and refrigeration equipment, pump body assembly is used for scroll compressor, and pump body assembly includes: static scroll; Dynamic scroll, with static scroll to be connected to enclose work chamber;Support, it is located in the side of dynamic scroll and with dynamic scroll enclose back pressure chamber;At least one pressure relief structure, including valve body and pressure relief passage, one end of pressure relief passage is communicated with work chamber, the other end of pressure relief passage extends to back pressure chamber, valve body is used to open or close pressure relief passage;Wherein, in the case where valve body opens pressure relief passage, back pressure chamber is communicated with work chamber;In the case where valve body closes pressure relief passage, back pressure chamber is disconnected with work chamber.The utility model provides the pump body assembly, so that the liquid or high-pressure fluid in work chamber enters back pressure chamber through pressure relief passage, can effectively avoid the condition of the broken condition of dynamic scroll or static scroll scroll tooth due to liquid force impact.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a pump assembly, a scroll compressor, and a refrigeration device. Background Technology

[0002] Currently, when using liquid injection enthalpy enhancement technology or encountering conditions such as liquid carryover during suction, liquid refrigerant is introduced into the compression chamber of the scroll compressor. Since liquids are nearly incompressible, a momentary, extremely high pressure peak is generated within the compression chamber when the scroll motion causes a rapid decrease in the internal volume. This hydraulic shock can easily lead to stress concentration and fracture at the root of the scroll teeth. Simultaneously, it washes away and dilutes the lubricating oil film on the contact surfaces of the moving and stationary scrolls, causing lubrication failure and severe wear on the disk surfaces. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] Therefore, the first aspect of this utility model provides a pump body assembly.

[0005] A second aspect of this invention also provides a scroll compressor.

[0006] A third aspect of this utility model also provides a refrigeration device.

[0007] In view of the above, the first aspect of this utility model provides a pump body assembly for use in a scroll compressor. The pump body assembly includes: a stationary scroll; a moving scroll connected to the stationary scroll to enclose a working chamber; a support disposed on one side of the moving scroll and enclosing a back pressure chamber with the moving scroll; and at least one pressure relief structure including a valve body and a pressure relief channel, one end of which is connected to the working chamber, and the other end of which extends to the back pressure chamber. The valve body is used to open or close the pressure relief channel. When the valve body opens the pressure relief channel, the back pressure chamber is connected to the working chamber; when the valve body closes the pressure relief channel, the back pressure chamber is disconnected from the working chamber.

[0008] The pump assembly provided by this utility model includes a stationary scroll, a moving scroll, a support, and at least one pressure relief structure. The stationary and moving scrolls mesh with each other, forming a working chamber for compressing fluid. The support is located on the side of the moving scroll away from the stationary scroll, and together with the moving scroll, defines a back pressure chamber, which is typically used to apply back pressure to balance the gas force on the moving scroll. The pressure relief structure includes a valve body and a pressure relief channel. One end of the pressure relief channel communicates with the working chamber, and the other end extends to the back pressure chamber. The valve body is used to open or close the pressure relief channel. When the valve body opens the pressure relief channel, the working chamber and the back pressure chamber are connected, allowing liquid or high-pressure fluid in the working chamber to enter the back pressure chamber through the pressure relief channel. This effectively prevents the volute teeth of the moving or stationary scroll from breaking due to hydraulic impact, and also prevents abnormal wear of the disk surface caused by abnormal pressure damaging the lubricating oil film, thus improving the operational reliability and durability of the scroll compressor. In addition, compared with the high-pressure chamber of the scroll compressor, the pressure in the back pressure chamber is relatively low. Therefore, by extending the pressure relief channel to the back pressure chamber and controlling the opening and closing of the pressure relief channel through the valve body, the opening threshold of the valve body can be reduced accordingly, reducing the difficulty of pressure relief and preventing damage to the scroll before pressure relief can occur.

[0009] In some embodiments, the working chamber may optionally include a plurality of compression chambers distributed radially along the moving scroll, and the pressure relief channel is connected to the outermost compression chamber in the radial direction.

[0010] In this embodiment, the working chamber includes multiple compression chambers distributed radially along the moving scroll. The pressure relief channel is connected to the outermost compression chamber located radially. This outermost compression chamber is the suction pressure region, where the pressure is relatively low. However, when the scroll compressor encounters abnormal operating conditions such as suction liquid carryover, the outermost compression chamber will be the first to experience a sharp increase in pressure, resulting in liquid slugging. By placing the inlet of the pressure relief channel here, once the valve body detects an abnormal pressure and opens, the high-pressure fluid can be directly discharged into the back pressure chamber through the pressure relief channel. This effectively curbs the further development of liquid slugging and other faults, thereby reducing the risk of scroll gear breakage due to hydraulic impact, protecting the lubrication conditions between the moving and stationary scrolls, and improving the overall reliability of the pump assembly.

[0011] In some embodiments, the working chamber may optionally include a first working chamber and a second working chamber, the stationary vortex disk is provided with an air intake port, and the first working chamber and the second working chamber are asynchronously or synchronously connected to the air intake port; wherein, the pressure relief channel is connected to at least one of the first working chamber and the second working chamber.

[0012] In this embodiment, the working chamber includes a first working chamber and a second working chamber. The communication between the first and second working chambers and the air intake port can be asynchronous or synchronous. A pressure relief channel is configured to communicate with at least one of the first and second working chambers. This connection method provides flexible pressure relief path selection; for example, the pressure relief channel can connect only to the first working chamber or only to the second working chamber to relieve abnormal pressure in either the first or second working chamber; or the pressure relief channel can simultaneously connect the first and second working chambers, allowing abnormal pressure in both chambers to be regulated.

[0013] In some embodiments, optionally, the number of pressure relief structures is at least two, wherein at least one pressure relief structure has a pressure relief channel connected to the first working chamber, and at least one pressure relief structure has a pressure relief channel connected to the second working chamber.

[0014] In this embodiment, at least one pressure relief structure is matched to the first working chamber and the second working chamber respectively. That is, the pressure relief channel of at least one pressure relief structure is connected to the first working chamber and the pressure relief channel of at least one pressure relief structure is connected to the second working chamber, so as to control the pressure in the first working chamber and the second working chamber separately, and avoid the pressure in the first working chamber and the second working chamber from affecting each other when the pressure in the first working chamber and the second working chamber are relieved through the same pressure relief channel.

[0015] In some embodiments, the pressure relief structure may optionally be provided in at least one of the stationary scroll plate and the moving scroll plate.

[0016] In this embodiment, the pressure relief structure is disposed in at least one of the stationary scroll plate and the moving scroll plate. When the pressure relief structure is disposed in the moving scroll plate, the pressure relief channel of the pressure relief structure can extend directly into the back pressure chamber, reducing the flow path length of the pressure relief channel and making the structure more compact. When the pressure relief structure is disposed in the stationary scroll plate, the overall weight of the moving parts is reduced.

[0017] In some embodiments, the moving scroll may optionally include an end cap and a first scroll tooth. The end cap includes a first end face and a second end face disposed opposite to each other. The first scroll tooth is disposed on the first end face, and at least a portion of the second end face surrounds a back pressure cavity with the support. When the pressure relief structure is disposed on the moving scroll, the portion of the second end face surrounding the back pressure cavity is provided with a groove, and the groove is recessed to the side opposite to the back pressure cavity. The pressure relief channel is disposed on the end cap, and at least a portion of the valve body is disposed in the groove.

[0018] In this embodiment, the pressure relief structure is disposed on the moving scroll. The moving scroll includes an end cap and a first scroll tooth. The end cap has a first end face and a second end face arranged opposite to each other. The first scroll tooth is disposed on the first end face and meshes with the stationary scroll to form a working cavity. At least a portion of the second end face, together with the support, forms a back pressure cavity. A groove is provided on the second end face of the moving scroll, and a pressure relief channel is disposed on the end cap. At least a portion of the valve body is accommodated within the groove, reducing the axial space occupied by the valve body in the back pressure cavity. This avoids abnormal friction between the valve body and the support during the movement of the moving scroll, and also avoids the impact of abnormal friction on the reliability of the moving scroll's movement.

[0019] In some embodiments, the groove is optionally disposed near the outer peripheral wall of the end cap; wherein at least a portion of the pressure relief channel extends from the root of the first volute towards the outer peripheral wall of the end cap.

[0020] In this embodiment, the groove is located near the outer peripheral wall of the end cover, which can locally weaken the rigidity of the end cover in the outer ring area. When the scroll compressor generates axial force fluctuations during operation, the part of the end cover where the groove is located can undergo slight elastic deformation, thereby buffering the rigid impact that may occur between the moving scroll and the stationary scroll, increasing the effective contact area, reducing the contact surface pressure, and helping to improve wear resistance. At the same time, at least a portion of the pressure relief channel extends from the root of the first scroll tooth towards the outer peripheral wall of the end cover, which on the one hand realizes the connection between the working chamber and the back pressure chamber and adapts to the position of the valve body; on the other hand, it can also ensure the protection effect on the root of the first scroll tooth.

[0021] In some embodiments, optionally, the pressure relief channel includes: a first channel disposed on the end cap and extending from the first end face to the second end face, one end of the first channel penetrating the first end face and communicating with the working chamber, and the other end of the first channel located inside the end cap; a second channel disposed on the end cap, one end of the second channel communicating with the other end of the first channel, and the other end of the second channel penetrating to the outer peripheral wall of the end cap; a third channel disposed on the bottom wall of the groove, one end of the third channel communicating with the second channel, a valve body disposed at the other end of the third channel, and the valve body being used to open or close the third channel; and a seal member sealing the other end of the second channel.

[0022] In this embodiment, the pressure relief channel includes a first channel, a second channel, and a third channel, all of which are located on the end cap. The first channel extends from the first end face to the second end face, with one end penetrating the first end face and the other end located inside the end cap, meaning the other end does not penetrate the second end face. One end of the second channel is located inside the end cap and communicates with the first channel, while the other end is located on and penetrates the outer peripheral wall of the end cap. A sealing element blocks the end of the second channel penetrating the outer peripheral wall of the end cap, preventing leakage of the medium from the compression chamber. The third channel extends from the bottom wall of the groove towards the first end face and connects to the second channel. This arrangement allows the valve body to be positioned within the groove near the outer peripheral wall of the end cap, reducing the space occupied by the back pressure chamber, and also facilitates the manufacturing of the pressure relief channel, reducing processing difficulty.

[0023] In some embodiments, the first channel is optionally located near the root of the first volute.

[0024] In this embodiment, the first channel is positioned close to the root of the first volute to reduce the impact on the root of the first volute when the pressure inside the working chamber is abnormal.

[0025] In some embodiments, the valve body may optionally be a check valve or a solenoid valve.

[0026] In this embodiment, the valve body is either a check valve or a solenoid valve. The check valve ensures that abnormally high-pressure media in the working chamber flows to the back pressure chamber, preventing media in the back pressure chamber from flowing into the working chamber, thus ensuring the reliability of media compression in the working chamber. The solenoid valve enhances the automation of pressure control and reduces the risk of pressure control failure.

[0027] In some embodiments, the valve body may optionally include: an elastic valve plate for opening or closing the pressure relief passage; and a limiting member disposed on the moving scroll or the stationary scroll for limiting the opening angle of the elastic valve plate.

[0028] In this embodiment, the valve body includes an elastic valve plate and a limiting member. The elastic valve plate can open or close the pressure relief channel by deformation. The limiting member is used to limit the opening angle of the elastic valve plate to ensure the reliability of the elastic valve plate's reset, thereby ensuring the reliability of the pressure relief channel's closure.

[0029] In some embodiments, optionally, when there are multiple pressure relief structures, the multiple pressure relief structures are arranged sequentially at intervals along the spiral direction of the moving scroll, or the multiple pressure relief structures are arranged sequentially at intervals along the circumference of the moving scroll.

[0030] In this embodiment, when there are multiple pressure relief structures, these structures can be arranged sequentially at intervals along the spiral direction of the moving scroll or sequentially at intervals along the circumference of the moving scroll. This provides timely pressure monitoring and relief channels at multiple positions of the moving scroll during operation and at multiple stages of the compression process, effectively avoiding the problem of scroll tooth overload fracture or abnormal end face wear caused by local pressure accumulation. This improves the operational stability and durability of the scroll compressor under complex operating conditions.

[0031] According to a second aspect of the present invention, a scroll compressor is also provided, comprising: a pump body assembly as described in any of the above embodiments.

[0032] The scroll compressor provided in the second aspect of this utility model, because it includes the pump body assembly proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly.

[0033] In some embodiments, the scroll compressor may optionally include: a housing, a pump assembly disposed within the housing; and an enthalpy-increasing port disposed within the housing and communicating with the working chamber for injecting refrigerant into the working chamber.

[0034] In this embodiment, the scroll compressor includes a housing, and the pump assembly is disposed within the housing. The housing has an enthalpy-increasing port, through which refrigerant can be injected into the working chamber formed by the meshing of the stationary scroll and the moving scroll, effectively controlling the exhaust temperature and avoiding operational reliability issues caused by excessively high or low exhaust temperature.

[0035] According to a third aspect of the present invention, a refrigeration device is also provided, comprising: a pump assembly or a scroll compressor as described in any of the above embodiments.

[0036] The refrigeration equipment provided in the third aspect of this utility model, because it includes the pump body assembly or scroll compressor proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly or scroll compressor.

[0037] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 One of the schematic diagrams of the pump body assembly according to an embodiment of the present invention is shown on the first end face side;

[0040] Figure 2 One of the schematic diagrams of the pump body assembly according to an embodiment of the present invention is shown on the second end face side;

[0041] Figure 3 One of the cross-sectional views of a partial structure of a pump body assembly according to an embodiment of the present invention is shown;

[0042] Figure 4 A second cross-sectional view of a portion of the structure of a pump body assembly according to an embodiment of the present invention is shown;

[0043] Figure 5 This is a second schematic diagram of the pump body assembly according to an embodiment of the present invention on the first end face side;

[0044] Figure 6 This is a second schematic diagram of the pump body assembly on the second end face side according to an embodiment of the present invention;

[0045] Figure 7 A schematic diagram of the structure of a scroll compressor according to an embodiment of the present invention is shown.

[0046] Among them, 1 is the moving scroll, 10 is the end cap, 100 is the first end face, 102 is the second end face, 104 is the groove, 12 is the first scroll tooth, 2 is the working chamber, 20 is the first working chamber, 22 is the second working chamber, 24 is the compression chamber, 3 is the pressure relief structure, 30 is the valve body, 300 is the one-way valve, 302 is the elastic valve plate, 32 is the pressure relief channel, 320 is the first channel, 322 is the second channel, 324 is the third channel, 326 is the seal, 4 is the stationary scroll, 5 is the bracket, 50 is the back pressure chamber, and 6 is the housing. Detailed Implementation

[0047] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0048] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0049] The following reference Figures 1 to 7 This invention describes a pump body assembly, a scroll compressor, and a refrigeration device according to some embodiments of the present invention.

[0050] like Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7As shown, according to one embodiment of the present invention, a pump body assembly is provided for use in a scroll compressor. The pump body assembly includes: a stationary scroll 4; a moving scroll 1 connected to the stationary scroll 4 to enclose a working chamber 2; a support 5 disposed on one side of the moving scroll 1 and enclosing a back pressure chamber 50 with the moving scroll 1; and at least one pressure relief structure 3, including a valve body 30 and a pressure relief channel 32. One end of the pressure relief channel 32 is connected to the working chamber 2, and the other end of the pressure relief channel 32 extends to the back pressure chamber 50. The valve body 30 is used to open or close the pressure relief channel 32. When the valve body 30 opens the pressure relief channel 32, the back pressure chamber 50 is connected to the working chamber 2. When the valve body 30 closes the pressure relief channel 32, the back pressure chamber 50 is disconnected from the working chamber 2.

[0051] The pump assembly provided by this utility model includes a stationary volute 4, a moving volute 1, a support 5, and at least one pressure relief structure 3. The stationary volute 4 and the moving volute 1 mesh with each other, together forming a working chamber 2 for compressing fluid. The support 5 is located on the side of the moving volute 1 away from the stationary volute 4, and together with the moving volute 1, defines a back pressure chamber 50. The back pressure chamber 50 is typically used to apply back pressure to balance the gas force on the moving volute 1. The pressure relief structure 3 includes a valve body 30 and a pressure relief channel 32. One end of the pressure relief channel 32 is connected to the working chamber 2, and the other end extends to the back pressure chamber 50. The valve body 30 is used to open or close the pressure relief channel 32. When the valve body 30 opens the pressure relief channel 32, the working chamber 2 is connected to the back pressure chamber 50, allowing the liquid or high-pressure fluid in the working chamber 2 to enter the back pressure chamber 50 through the pressure relief channel 32. This effectively prevents the volute teeth of the moving scroll 1 or stationary scroll 4 from breaking due to hydraulic impact, and also prevents abnormal wear of the disk surface caused by abnormal pressure damaging the lubricating oil film, thus improving the operational reliability and durability of the scroll compressor. In addition, compared with the high-pressure chamber of the scroll compressor, the pressure in the back pressure chamber 50 is relatively low. Therefore, extending the pressure relief channel 32 to the back pressure chamber 50 and controlling the opening and closing of the pressure relief channel 32 through the valve body 30 can correspondingly reduce the opening threshold of the valve body 30, reducing the difficulty of pressure relief and preventing damage to the scroll before pressure relief can occur.

[0052] Optionally, when the pressure value in the working chamber 2 is greater than or equal to the preset pressure, the valve body 30 opens the pressure relief channel 32 to connect the working chamber 2 and the back pressure chamber 50. When the pressure value in the working chamber 2 is less than the preset pressure, the valve body 30 closes the pressure relief channel 32 to disconnect the working chamber 2 and the back pressure chamber 50.

[0053] like Figure 1As shown, in some embodiments, optionally, the working chamber 2 includes a plurality of compression chambers 24, which are distributed radially along the moving scroll 1, and the pressure relief channel 32 is connected to the outermost compression chamber 24 in the radial direction among the plurality of compression chambers 24.

[0054] In this embodiment, the working chamber 2 includes multiple compression chambers 24, which are radially distributed along the moving scroll 1. The pressure relief channel 32 is connected to the outermost compression chamber 24 in the radial direction. The outermost compression chamber 24 is the suction pressure region, where the pressure is relatively low. However, when the scroll compressor encounters abnormal operating conditions such as suction liquid carryover, the outermost compression chamber 24 will be the first to experience a sharp increase in pressure and liquid slugging. By placing the inlet of the pressure relief channel 32 here, once the valve body 30 detects an abnormal pressure and opens, the high-pressure fluid can be directly discharged into the back pressure chamber 50 through the pressure relief channel 32. This effectively curbs the further development of faults such as liquid slugging, thereby reducing the risk of the scroll teeth breaking due to hydraulic impact and protecting the lubrication conditions between the moving scroll 1 and the stationary scroll 4, thus improving the overall reliability of the pump assembly.

[0055] like Figure 5 and Figure 6 As shown, in some embodiments, optionally, the working chamber 2 includes a first working chamber 20 and a second working chamber 22, the static vortex disk 4 is provided with an air intake, and the first working chamber 20 and the second working chamber 22 are asynchronously connected to the air intake or synchronously connected to the air intake; wherein, the pressure relief channel 32 is connected to at least one of the first working chamber 20 and the second working chamber 22.

[0056] In this embodiment, the working chamber 2 includes a first working chamber 20 and a second working chamber 22. The connection between the first working chamber 20 and the second working chamber 22 and the air intake can be asynchronous or synchronous. The pressure relief channel 32 is configured to communicate with at least one of the first working chamber 20 and the second working chamber 22. This connection method provides flexible pressure relief path selection. For example, the pressure relief channel 32 can be connected only to the first working chamber 20 or only to the second working chamber 22 to relieve abnormal pressure in either the first working chamber 20 or the second working chamber 22; or the pressure relief channel 32 can be connected to both the first working chamber 20 and the second working chamber 22 simultaneously, so that abnormal pressure in both the first working chamber 20 and the second working chamber 22 can be regulated.

[0057] It is understandable that the number of pressure relief structures 3 is at least one. When there is only one pressure relief structure 3, if the pressure relief channel 32 is simultaneously connected to both the first working chamber 20 and the second working chamber 22, then one pressure relief channel 32 connects both the first working chamber 20 and the second working chamber 22. When there are multiple pressure relief structures 3, if the pressure relief channel 32 is connected to both the first working chamber 20 and the second working chamber 22, then at least one pressure relief structure 3 can be matched to both the first working chamber 20 and the second working chamber 22. That is, the pressure relief channel 32 of at least one pressure relief structure 3 is connected to the first working chamber 20, and the pressure relief channel 32 of at least one pressure relief structure 3 is connected to the second working chamber 22.

[0058] Optionally, the moving volute 1 and the stationary volute 4 are either asymmetrical or symmetrical structures. Optionally, when the moving volute 1 and the stationary volute 4 are symmetrical structures, the first working chamber 20 and the second working chamber 22 draw in air synchronously. When the moving volute 1 and the stationary volute 4 are asymmetrical structures, the first working chamber 20 and the second working chamber 22 draw in air asynchronously, that is, they do not draw in air at the same time.

[0059] In some embodiments, optionally, the number of pressure relief structures 3 is at least two, wherein at least one pressure relief structure 3 has a pressure relief channel 32 connected to the first working chamber 20, and at least one pressure relief structure 3 has a pressure relief channel 32 connected to the second working chamber 22.

[0060] In this embodiment, at least one pressure relief structure 3 is matched with the first working chamber 20 and the second working chamber 22 respectively. That is, the pressure relief channel 32 of at least one pressure relief structure 3 is connected to the first working chamber 20 and the pressure relief channel 32 of at least one pressure relief structure 3 is connected to the second working chamber 22, so as to control the pressure in the first working chamber 20 and the second working chamber 22 separately, and avoid the pressure in the first working chamber 20 and the second working chamber 22 from affecting each other when the pressure in the first working chamber 20 and the second working chamber 22 is relieved through the same pressure relief channel 32.

[0061] In some embodiments, the pressure relief structure 3 may optionally be provided in at least one of the stationary scroll plate 4 and the moving scroll plate 1.

[0062] In this embodiment, the pressure relief structure 3 is provided in at least one of the stationary scroll plate 4 and the moving scroll plate 1. When the pressure relief structure 3 is provided in the moving scroll plate 1, the pressure relief channel 32 of the pressure relief structure 3 can extend directly into the back pressure chamber 50, reducing the flow path length of the pressure relief channel 32 and making the structure more compact. When the pressure relief structure 3 is provided in the stationary scroll plate 4, the overall weight of the movable parts is reduced.

[0063] It is understandable that when the pressure relief structure 3 is set on the moving scroll plate 1 and the stationary scroll plate 4, the number of pressure relief structures 3 can be one or at least two. If the number of pressure relief structures 3 is one, for example, part of the pressure relief channel 32 is set on the stationary scroll plate 4 and the other part is set on the moving scroll plate 1.

[0064] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, optionally, the moving scroll 1 includes an end cap 10 and a first scroll tooth 12. The end cap 10 includes a first end face 100 and a second end face 102 disposed opposite to each other. The first scroll tooth 12 is disposed on the first end face 100. At least a portion of the second end face 102 and the bracket 5 enclose a back pressure cavity 50. When the pressure relief structure 3 is disposed on the moving scroll 1, the portion of the second end face 102 that encloses the back pressure cavity 50 is provided with a groove 104, and the groove 104 is recessed to the side opposite to the back pressure cavity 50. The pressure relief channel 32 is disposed on the end cap 10, and at least a portion of the valve body 30 is disposed in the groove 104.

[0065] In this embodiment, the pressure relief structure 3 is disposed on the moving scroll 1. The moving scroll 1 includes an end cap 10 and a first scroll tooth 12. The end cap 10 has a first end face 100 and a second end face 102 disposed opposite to each other. The first scroll tooth 12 is disposed on the first end face 100 and meshes with the stationary scroll 4 to form a working cavity 2. At least a portion of the second end face 102 together with the support 5 forms a back pressure cavity 50. A groove 104 is provided on the second end face 102 of the moving scroll 1. The pressure relief channel 32 is disposed on the end cap 10, and at least a portion of the valve body 30 is accommodated in the groove 104. This reduces the occupancy of the valve body 30 on the axial space of the back pressure cavity 50, thereby avoiding abnormal friction between the valve body 30 and the support 5 during the movement of the moving scroll 1, and also avoiding the impact of abnormal friction on the reliability of the movement of the moving scroll 1.

[0066] like Figure 2 and Figure 4 As shown, in some embodiments, the groove 104 is optionally disposed near the outer peripheral wall of the end cap 10; wherein at least a portion of the pressure relief channel 32 extends from the root of the first volute 12 toward the outer peripheral wall of the end cap 10.

[0067] In this embodiment, the groove 104 is located near the outer peripheral wall of the end cover 10, which can locally weaken the rigidity of the end cover 10 in the outer ring region. When the scroll compressor generates axial force fluctuations during operation, the portion of the end cover 10 where the groove 104 is located can undergo slight elastic deformation, thereby buffering the possible rigid impact between the moving scroll 1 and the stationary scroll 4, increasing the effective contact area, reducing the contact surface pressure, and helping to improve wear resistance. At the same time, at least a portion of the pressure relief channel 32 extends from the root of the first scroll tooth 12 toward the outer peripheral wall of the end cover 10, which on the one hand realizes the communication between the working chamber 2 and the back pressure chamber 50 and adapts to the position of the valve body 30; on the other hand, it can also ensure the protection effect on the root of the first scroll tooth 12.

[0068] Optionally, the inlet end of the pressure relief channel 32 is located near the root of the first volute 12. The root of the first volute 12 is also the end where the first volute 12 is connected to the first end face 100.

[0069] like Figure 4 As shown, in some embodiments, optionally, the pressure relief channel 32 includes: a first channel 320, disposed on the end cap 10 and extending from the first end face 100 to the second end face 102, one end of the first channel 320 penetrating the first end face 100 and communicating with the working chamber 2, and the other end of the first channel 320 located inside the end cap 10; a second channel 322, disposed on the end cap 10, one end of the second channel 322 communicating with the other end of the first channel 320, and the other end of the second channel 322 penetrating to the outer peripheral wall of the end cap 10; a third channel 324, disposed on the bottom wall of the groove 104, one end of the third channel 324 communicating with the second channel 322, a valve body 30 disposed at the other end of the third channel 324, and the valve body 30 being used to open or close the third channel 324; and a sealing element 326, sealing the other end of the second channel 322.

[0070] In this embodiment, the pressure relief channel 32 includes a first channel 320, a second channel 322, and a third channel 324, all of which are disposed on the end cap 10. The first channel 320 extends from the first end face 100 to the second end face 102, with one end penetrating the first end face 100 and the other end located inside the end cap 10, meaning the other end of the first channel 320 does not penetrate the second end face 102. One end of the second channel 322 is located inside the end cap 10 and communicates with the first channel 320, while the other end is located on and penetrates the outer peripheral wall of the end cap 10. Simultaneously, a sealing element 326 seals the end of the second channel 322 penetrating the outer peripheral wall of the end cap 10, preventing the medium in the compression chamber 24 from leaking out from the other end of the second channel 322. The third channel 324 extends from the bottom wall of the groove 104 to the first end face 100 and connects with the second channel 322. This design allows the valve body 30 to be placed in the groove 104 near the outer peripheral wall of the end cover 10, reducing the space occupied by the back pressure chamber 50, and also facilitates the manufacturing of the pressure relief channel 32, reducing the processing difficulty.

[0071] Understandably, if the other end of the first channel 320 were to directly penetrate the second end face 102, the valve body 30 would need to be positioned at the other end of the first channel 320. This would cause the valve body 30 to move towards the center of the end cover 10, thereby occupying space in the back pressure chamber 50 and affecting the movement of the moving scroll 1. However, this application, through the arrangement of the first channel 320, the second channel 322, and the third channel 324, allows the valve body 30 to be installed in the groove 104 near the outer peripheral wall of the end cover 10, thus reducing the space occupied in the back pressure chamber 50.

[0072] Optionally, the first channel 320 can be machined from the first end face 100 side, the second channel 322 can be machined from the outer peripheral wall of the end cover 10, and the third channel 324 can be machined from the second end face 102 side, thereby reducing the machining difficulty of the first channel 320, the second channel 322 and the third channel 324.

[0073] like Figure 4 As shown, in some embodiments, the first channel 320 is optionally located near the root of the first volute 12.

[0074] In this embodiment, the first channel 320 is positioned close to the root of the first volute 12 to reduce the impact on the root of the first volute 12 when the pressure inside the working chamber 2 is abnormal.

[0075] In some embodiments, the valve body 30 may optionally be a check valve 300 or a solenoid valve.

[0076] In this embodiment, the valve body 30 is either a one-way valve 300 or a solenoid valve. The one-way valve 300 ensures that abnormally high-pressure media in the working chamber 2 can flow to the back pressure chamber 50, while preventing media in the back pressure chamber 50 from flowing to the working chamber 2, thus ensuring the reliability of media compression in the working chamber 2. The control of the solenoid valve improves the automation level of pressure control and reduces the risk of pressure control failure.

[0077] like Figure 3 and Figure 4 As shown, in some embodiments, the valve body 30 may optionally include: an elastic valve plate 302 for opening or closing the pressure relief channel 32; and a limiting member disposed on the moving scroll 1 or the stationary scroll 4 for limiting the opening angle of the elastic valve plate 302.

[0078] In this embodiment, the valve body 30 includes an elastic valve plate 302 and a limiting member. The elastic valve plate 302 can open or close the pressure relief channel 32 by deformation. The limiting member is used to limit the opening angle of the elastic valve plate 302 to ensure the reliability of the reset of the elastic valve plate 302, thereby ensuring the reliability of the closure of the pressure relief channel 32.

[0079] Optionally, when the pressure in the working chamber 2 is normal, the elastic valve plate 302 closes the pressure relief channel 32 under its own preload or external pressure. When the pressure in the working chamber 2 abnormally rises and exceeds the set value, the fluid pressure overcomes the closing force of the elastic valve plate 302, causing it to elastically deform and open, thereby opening the pressure relief channel 32 and allowing the high-pressure fluid to be released. At this time, the limiting component provides a mechanical barrier to ensure that the opening angle or maximum displacement of the elastic valve plate 302 is limited within a predetermined safe range when it opens. This prevents the elastic valve plate 302 from undergoing plastic deformation or fatigue fracture due to excessive opening angle. At the same time, the limiting component ensures the reliability and durability of the elastic valve plate 302 under long-term repeated operation, avoiding damage to the elastic valve plate 302 due to excessive opening, thereby ensuring the stability of the pressure relief function.

[0080] Alternatively, the limiting element can be a baffle or a limiting block.

[0081] In some embodiments, optionally, when there are multiple pressure relief structures 3, the multiple pressure relief structures 3 are arranged sequentially at intervals along the spiral direction of the moving scroll 1, or the multiple pressure relief structures 3 are arranged sequentially at intervals along the circumference of the moving scroll 1.

[0082] In this embodiment, when there are multiple pressure relief structures 3, the multiple pressure relief structures 3 can be arranged sequentially at intervals along the spiral direction of the moving scroll 1, or arranged sequentially at intervals along the circumference of the moving scroll 1. This can provide timely pressure monitoring and relief channels at multiple positions of the moving scroll 1 during operation and at multiple stages of the compression process, effectively avoiding the problem of scroll tooth overload fracture or abnormal end face wear caused by local pressure accumulation, thereby improving the operational stability and durability of the scroll compressor under complex working conditions.

[0083] like Figure 7 As shown, according to one embodiment of the present invention, a scroll compressor is also proposed, comprising: a pump body assembly as described in any of the above embodiments.

[0084] The scroll compressor provided by this utility model, because it includes the pump body assembly proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly.

[0085] In some embodiments, the scroll compressor may optionally include: a housing 6, a pump assembly disposed within the housing 6; and an enthalpy-increasing port disposed within the housing 6 and connected to the working chamber 2 for injecting refrigerant into the working chamber 2.

[0086] In this embodiment, the scroll compressor includes a housing 6, and a pump assembly is disposed within the housing 6. The housing 6 has an enthalpy-increasing port, through which refrigerant can be injected into the working chamber 2 formed by the meshing of the stationary scroll 4 and the moving scroll 1, effectively controlling the exhaust temperature and avoiding operational reliability issues caused by excessively high or low exhaust temperature.

[0087] It is understandable that the fluid injected through the enthalpy-increasing port is usually at a low temperature. When the gas in the working chamber 2 is compressed to an intermediate pressure, the low-temperature refrigerant is directly injected into the compression chamber 24 through the enthalpy-increasing port, mixing with the hot gas being compressed. This process effectively cools the gas in the chamber, reducing its temperature. Subsequently, the mixed gas is further compressed to its final state and then discharged. When liquid refrigerant is injected into the working chamber 2 through the enthalpy-increasing port, if the volume of the closed compression chamber 24 containing liquid is rapidly reduced during the vortex motion, it will cause a momentary huge pressure peak in the compression chamber 24. The pump assembly proposed in this application can guide the fluid into the back pressure chamber 50 through the cooperation of the pressure relief channel 32 and the valve body 30, reducing the impact of abnormal pressure on the moving scroll 1 and the stationary scroll 4.

[0088] According to one embodiment of the present invention, a refrigeration device is also provided, comprising: a pump assembly or a scroll compressor as described in any of the above embodiments.

[0089] The refrigeration equipment provided by this utility model, because it includes the pump body assembly or scroll compressor proposed in any of the above embodiments, has all the beneficial effects of the pump body assembly or scroll compressor.

[0090] Optionally, the refrigeration equipment includes air conditioners.

[0091] According to some embodiments of this application, optionally, it can effectively prevent damage to the scroll compressor due to liquid slugging under wet operating conditions such as liquid injection and liquid carryover during suction. Specifically, this application can solve problems such as excessively high instantaneous pressure caused by the inability of liquid in the compression chamber 24 to be discharged in time, which in turn leads to the breakage of the scroll teeth of the stationary scroll 4 and / or the moving scroll 1, and abnormal wear of the disk surface.

[0092] Optionally, the pump assembly includes a stationary volute 4, a moving volute 1 that cooperates with the stationary volute 4 to form multiple compression chambers 24, a back pressure chamber 50 located on the back of the moving volute 1, and at least one pressure relief structure 3. The pressure relief structure 3 includes a pressure relief passage 32 and a valve body 30. The pressure relief passage 32 has at least one inlet and at least one outlet. The pressure relief passage 32 can be opened when the pressure in the compression chamber 24 exceeds a preset threshold, so that the inlet is connected to at least one of the compression chambers 24; the outlet is connected to the back pressure chamber 50, guiding the fluid discharged from the inlet into the back pressure chamber 50.

[0093] Optionally, the pressure relief structure 3 can be set on the moving scroll 1, so that the outlet of the pressure relief channel 32 can directly face the back pressure chamber 50, which is the most compact structure and the shortest pressure relief path.

[0094] Optionally, the pressure relief structure 3 can also be provided on the stationary scroll plate 4. When the pressure relief structure 3 is provided on the stationary scroll plate 4, the outlet of the pressure relief channel 32 can be connected to the back pressure chamber 50 through an additional channel opened on the stationary scroll plate 4 or the housing 6 of the scroll compressor.

[0095] Optionally, the valve body 30 can be a one-way valve 300. Optionally, the one-way valve 300 includes a valve seat, a deformable elastic valve plate 302, and a limiting element for restricting the opening stroke of the elastic valve plate 302. The valve seat has a pressure relief orifice, which is normally closed by the valve plate. When the pressure in the compression chamber 24 exceeds a preset value, the enormous pressure acts on the elastic valve plate 302, causing it to deform and open, allowing liquid to be discharged through the pressure relief orifice. When the pressure in the compression chamber 24 returns to normal, the elastic valve plate 302 resets and closes under its own elastic force or with the assistance of pressure from the back pressure chamber 50.

[0096] Optionally, the opening pressure (i.e., preset value) of the valve body 30 can be achieved by reasonably designing the bending stiffness determined by the material, thickness and geometry of the elastic valve plate 302 itself.

[0097] Alternatively, the valve body 30 can also be a solenoid valve.

[0098] The embodiments proposed in this application provide a fast, low-resistance pressure relief channel 32 when liquid slugging occurs, which effectively avoids failures such as volute breakage caused by hydraulic impact and disc wear caused by lubrication failure, and greatly improves the operational reliability and durability of the scroll compressor under suction liquid-carrying conditions or liquid injection enthalpy-increasing conditions.

[0099] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0100] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pump body assembly, characterized in that, The pump body assembly is used in a scroll compressor, and the pump body assembly includes: Static vortex disk; A moving scroll plate is connected to the stationary scroll plate to enclose the working cavity; A support is provided on one side of the moving scroll and surrounds the back pressure cavity with the moving scroll; At least one pressure relief structure includes a valve body and a pressure relief channel, one end of the pressure relief channel is connected to the working chamber, and the other end of the pressure relief channel extends to the back pressure chamber, and the valve body is used to open or close the pressure relief channel; Specifically, when the valve body opens the pressure relief channel, the back pressure chamber is connected to the working chamber; when the valve body closes the pressure relief channel, the back pressure chamber is disconnected from the working chamber.

2. The pump body assembly according to claim 1, characterized in that, The working chamber includes multiple compression chambers, which are radially distributed along the moving scroll. The pressure relief channel is connected to the outermost compression chamber in the radial direction.

3. The pump body assembly according to claim 1, characterized in that, The working chamber includes a first working chamber and a second working chamber. The static vortex disk is provided with an air intake port. The first working chamber and the second working chamber are asynchronously connected to the air intake port or synchronously connected to the air intake port. The pressure relief channel is connected to at least one of the first working chamber and the second working chamber.

4. The pump body assembly according to claim 3, characterized in that, The number of pressure relief structures is at least two, wherein the pressure relief channel of at least one pressure relief structure is connected to the first working chamber, and the pressure relief channel of at least one pressure relief structure is connected to the second working chamber.

5. The pump body assembly according to claim 1, characterized in that, The pressure relief structure is provided in at least one of the stationary scroll plate and the moving scroll plate.

6. The pump body assembly according to claim 5, characterized in that, The moving scroll includes an end cap and a first scroll tooth. The end cap includes a first end face and a second end face that are arranged opposite to each other. The first scroll tooth is disposed on the first end face. At least a portion of the second end face and the bracket enclose the back pressure cavity. When the pressure relief structure is provided on the moving vortex, the portion of the second end face that encloses the back pressure cavity is provided with a groove, and the groove is recessed to the side away from the back pressure cavity. The pressure relief channel is located in the end cap, and at least a portion of the valve body is located in the groove.

7. The pump body assembly according to claim 6, characterized in that, The groove is located near the outer peripheral wall of the end cap; At least a portion of the pressure relief channel extends from the root of the first vortex tooth to the outer peripheral wall of the end cap.

8. The pump body assembly according to claim 7, characterized in that, The pressure relief channel includes: A first channel is provided on the end cap and extends from the first end face to the second end face. One end of the first channel passes through the first end face and communicates with the working cavity, and the other end of the first channel is located inside the end cap. A second channel is provided on the end cap, one end of the second channel is connected to the other end of the first channel, and the other end of the second channel extends through the outer peripheral wall of the end cap. A third channel is provided on the bottom wall of the groove. One end of the third channel is connected to the second channel. The valve body is provided at the other end of the third channel. The valve body is used to open or close the third channel. A seal is placed at the other end of the second channel.

9. The pump body assembly according to claim 8, characterized in that, The first channel is positioned close to the root of the first vortex.

10. The pump body assembly according to any one of claims 1 to 9, characterized in that, The valve body is a one-way valve or a solenoid valve.

11. The pump body assembly according to any one of claims 1 to 9, characterized in that, The valve body includes: A resilient valve plate, the resilient valve plate being used to open or close the pressure relief passage; A limiting element is provided on the moving scroll or the stationary scroll, and the limiting element is used to limit the opening angle of the elastic valve plate.

12. The pump body assembly according to any one of claims 1 to 9, characterized in that, When there are multiple pressure relief structures, the multiple pressure relief structures are arranged at intervals along the spiral direction of the moving scroll, or the multiple pressure relief structures are arranged at intervals along the circumference of the moving scroll.

13. A scroll compressor, characterized in that, include: The pump body assembly as described in any one of claims 1 to 12.

14. The scroll compressor according to claim 13, characterized in that, Also includes: Housing, the pump body assembly is disposed within the housing; An enthalpy-increasing port is located in the housing and communicates with the working chamber, for injecting refrigerant into the working chamber.

15. A refrigeration device, characterized in that, include: Pump body assembly as described in any one of claims 1 to 12; or The scroll compressor as described in claim 13 or 14.

Images