Compressor, thermal management system and vehicle

Abstract

The invention discloses a compressor, a heat management system and a vehicle, relates to the technical field of vehicles, and aims to solve the problem of how to lubricate the compressor. The compressor comprises a first compression device, a second compression device and an oil-liquid separation device which are sequentially arranged from a compressor inlet to a compressor outlet, and the oil-liquid separation device is used for separating lubricating liquid in compressed gas discharged from the second compression device. A backflow channel is arranged among the oil-liquid separation device, the second compression device and the first compression device, and the backflow channel is suitable for guiding the lubricating liquid to flow back to the second compression device and the first compression device from the oil-liquid separation device.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a compressor, a thermal management system and a vehicle. Background Art

[0002] A multi-stage compressor generally includes a low-pressure side compression device and a high-pressure side compression device. However, in the related art, when lubricating the two compression devices with lubricating fluid, the oil circuit of the compressor is relatively complicated. Summary of the Invention

[0003] The purpose of this application is to provide a compressor, a thermal management system and a vehicle, aiming to solve the problem of how to lubricate the compressor.

[0004] In a first aspect, a compressor is provided, comprising a first compression device, a second compression device, and an oil-liquid separator, arranged in sequence from a compressor inlet to a compressor outlet. The oil-liquid separator is configured to separate lubricating liquid from compressed gas discharged from the second compression device. A return channel is provided between the oil-liquid separator, the second compression device, and the first compression device. The return channel is configured to direct lubricating liquid from the oil-liquid separator back to the second compression device and the first compression device.

[0005] Since the first compression device, the second compression device and the oil-liquid separation device are arranged in sequence from the compressor inlet to the compressor outlet, the pressure of the compressed gas in the oil-liquid separator is relatively high, and the gas pressure in the first compression device and the second compression device is relatively low. Under the action of the gas pressure, the lubricating liquid in the oil-liquid separation device can automatically flow toward the first compression device and the second compression device, thereby achieving lubrication of the first compression device and the second compression device.

[0006] Furthermore, the lubricating fluid is driven to flow by the pressure difference of the gas, and there is no need to set up an additional device for driving the flow of the lubricating fluid. This can simplify the structure of the compressor, facilitate the processing of the compressor, and reduce the cost of the compressor.

[0007] Optionally, the reflux channel includes a first portion, a second portion, and a third portion. The first end of the first portion is connected to the oil-liquid separation device. The first end of the second portion is connected to the second end of the first portion, and the second end of the second portion is connected to the first compression device. The first end of the third portion is connected to the second end of the first portion, and the second end of the third portion is connected to the second compression device.

[0008] Optionally, the reflux channel further includes a back pressure chamber, which is disposed between the first compression device and the second compression device and is in communication with the second end of the first portion, the first end of the second portion, and the first end of the third portion.

[0009] Optionally, the second compression device includes a first mover and a first stator, wherein the first stator is located on a side of the first mover facing away from the first compression device. A backpressure chamber is located between the first compression device and the first mover. The first stator is fixed relative to the first compression device, and the medium in the backpressure chamber can exert a force on the first mover directed toward the first stator.

[0010] Optionally, the compressor further includes a first support member, the first support member being shell-shaped. The first support member and the first compression device are located on the same side of the second compression device, and the first compression device is located within the first support member. The first stator is connected to the first support member, and the back pressure chamber is located between the first support member and the first mover.

[0011] Optionally, a first connecting hole and a second connecting hole are provided on a side wall of the first support member near the first mover. One end of the first connecting hole communicates with the back pressure chamber, and the other end of the first connecting hole communicates with the interior space of the first support member. One end of the second connecting hole communicates with the interior space of the first support member, and the other end of the second connecting hole communicates with the air inlet of the second compression device. The first connecting hole, the interior space of the first support member, and the second connecting hole form a third portion.

[0012] Optionally, the compressor further includes a first flow regulating element, which is disposed in the first communicating hole.

[0013] Optionally, the first compression device includes a second mover and a second stator. The second stator is connected to the first support member. The compressor further includes a transmission shaft connected to the second mover and configured to drive the second mover to rotate. The transmission shaft extends through a side wall of the first support member facing the first mover and is in communication with the backpressure chamber. At least a portion of the second portion is disposed on the transmission shaft.

[0014] Optionally, the other end of the first channel is connected to the compression chamber between the second mover and the second stator.

[0015] Optionally, the second part further includes a second channel provided between the second mover and / or between the second mover and the transmission shaft, one end of the second channel being connected to the other end of the first channel, and the other end of the second channel being connected to the compression chamber between the second mover and the second stator.

[0016] Optionally, the first channel includes a first sub-channel and a second sub-channel, the first sub-channel is connected to the back pressure chamber, the second sub-channel is connected between the first sub-channel and the second channel, and the cross-sectional area of ​​the second sub-channel is smaller than the cross-sectional area of ​​the first sub-channel.

[0017] Optionally, a transmission shaft is connected to the first mover, and the transmission shaft is used to drive the first mover to rotate.

[0018] Optionally, the compressor further comprises a connecting rod, which is disposed in the back pressure chamber and connected to the transmission shaft. The axis of the connecting rod is located on one side of the axis of the transmission shaft in a radial direction. The first mover is connected to the connecting rod.

[0019] Optionally, the second part further includes a third channel, which is provided on the connecting rod and communicates between the first channel and the back pressure chamber.

[0020] Optionally, the second compression device further comprises a counterweight block, the counterweight block comprises a counterweight portion, the counterweight portion is connected to the transmission shaft and / or the connecting rod, and is located on a side of the rotation axis of the transmission shaft facing away from the axis of the connecting rod.

[0021] Optionally, the counterweight further comprises a connecting portion, the counterweight portion is connected to the connecting portion and is connected to the transmission shaft, and the connecting portion is connected to the connecting rod.

[0022] Optionally, the oil-liquid separation device is provided with an oil-liquid separation chamber, the oil-liquid separation chamber has a first position and a second position, the first position is connected to the outlet of the second compression device, the second position is connected to the first part, and the first position is located above the second position.

[0023] Optionally, the compressor further includes a second flow regulating element, and the second flow regulating element is disposed in the first part.

[0024] Optionally, the compressor further includes a second inlet, which is connected to the inlet of the second compression device.

[0025] Optionally, the compressor has a first operating state and a second operating state. When the compressor is in the first operating state, the first compression device compresses gas entering the first compression device through the first inlet. The second compression device compresses gas discharged from the first compression device and also compresses gas entering the second compression device through the second inlet. When the compressor is in the second operating state, the first compression device operates at no load. The second compression device compresses gas discharged from the first compression device and also compresses gas entering the second compression device through the second inlet.

[0026] In a second aspect, a thermal management system is also provided, comprising the above-mentioned compressor.

[0027] Optionally, the compressor further includes a second inlet, the second inlet being in communication with the inlet of the second compression device. The thermal management system further includes an air conditioning system and a refrigerator system, the first inlet being in communication with the outlet of the air conditioning system, and the second inlet being in communication with the outlet of the refrigerator system. The outlet of the compressor is in communication with the inlets of the air conditioning system and the refrigerator system.

[0028] Optionally, the thermal management system has a first operating mode and a second operating mode. When the thermal management system is in the first operating mode, the compressor is in a first operating state, and the first compression device compresses gas entering the first compression device through a first inlet. The second compression device compresses gas discharged from the first compression device and also compresses gas entering the second compression device through a second inlet. When the thermal management system is in the second operating mode, the compressor is in a second operating state, and the first compression device operates at no load. The second compression device compresses gas discharged from the first compression device and also compresses gas entering the second compression device through a second inlet.

[0029] In a third aspect, a vehicle is provided, comprising the above-mentioned compressor, or the above-mentioned thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a compressor provided in an embodiment of the present application;

[0033] Figure 3 A schematic cross-sectional view of a compressor parallel to the axial direction of the transmission shaft provided in an embodiment of the present application;

[0034] Figure 4 Another schematic cross-sectional view of a compressor parallel to the axial direction of the transmission shaft provided in an embodiment of the present application;

[0035] Figure 5 A schematic cross-sectional view of a compressor perpendicular to the axial direction of the transmission shaft provided in an embodiment of the present application;

[0036] Figure 6 Another schematic cross-sectional view of a compressor perpendicular to the axial direction of the drive shaft provided in an embodiment of the present application.

[0037] Reference numerals:

[0038] 100. Vehicle; 10. Compressor;

[0039] 1. First compression device; 11. First mover; 12. First stator;

[0040] 2. Second compression device; 21. Second mover; 22. Second stator; 3. Oil-liquid separation device; 31. Oil-liquid separation chamber;

[0041] 4. Reflux channel; 41. First portion; 411. Third sub-channel; 412. First connecting groove; 42. Second portion; 421. First channel; 4211. First sub-channel; 4212. Second sub-channel; 43. Third portion; 44. Back pressure chamber;

[0042] 5. First support member; 51. First communication hole; 52. Second communication hole; 53. First inlet; 54. Second inlet; 55. First sub-section; 56. Second sub-section; 57. Second communication groove;

[0043] 6. a first flow regulating element;

[0044] 71. Transmission shaft; 72. Connecting rod; 721. Third channel; 73. Counterweight; 731. Counterweight portion; 732. Connecting portion; 74. Driving device; 75. First bearing; 76. Second bearing; 77. Third bearing; 78. Electronic control box;

[0045] 8. A second flow regulating element;

[0046] 20. Vehicle body. DETAILED DESCRIPTION

[0047] In the embodiments of the present application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of the features.

[0048] In the embodiments of the present application, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0049] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0050] In the embodiments of the present application, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement being discussed and the errors associated with the measurement of a specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0051] like Figure 1 As shown, Figure 1 This is a structural schematic diagram of a vehicle 100 provided in an embodiment of the present application. The present application provides a vehicle 100, including a vehicle body 20 and a thermal management system. The thermal management system is arranged on the vehicle body 20 and is used to cool or heat the passenger compartment and refrigerator on the vehicle body 20.

[0052] In some embodiments, as Figure 2 、 Figure 3 As shown, Figure 2 This is a schematic diagram of the structure of the compressor 10 provided in an embodiment of the present application. Figure 3 A cross-sectional schematic diagram of a compressor 10 parallel to the axial direction of the drive shaft 71 provided in an embodiment of the present application, the thermal management system includes a compressor 10, and the compressor 10 includes a first compression device 1, a second compression device 2 and an oil-liquid separation device 3 arranged in sequence from the first inlet 53 of the compressor 10 to the outlet of the compressor 10, and the oil-liquid separation device 3 is used to separate the lubricating liquid in the compressed gas discharged from the second compression device 2.

[0053] A reflux channel 4 is provided between the oil-liquid separation device 3 , the second compression device 2 and the first compression device 1 . The reflux channel 4 is suitable for guiding the lubricating liquid from the oil-liquid separation device 3 to flow back to the second compression device 2 and the first compression device 1 .

[0054] Since the first compression device 1, the second compression device 2 and the oil-liquid separation device 3 are arranged in sequence from the inlet to the outlet of the compressor 10, the pressure of the compressed gas in the oil-liquid separator is relatively high, and the gas pressure in the first compression device 1 and the second compression device 2 is relatively low. Under the action of the gas pressure, the lubricating liquid in the oil-liquid separation device 3 can automatically flow toward the first compression device 1 and the second compression device 2, thereby achieving lubrication of the first compression device 1 and the second compression device 2.

[0055] Furthermore, the lubricating fluid is driven to flow by the pressure difference of the gas, and there is no need to set up an additional device for driving the flow of the lubricating fluid. This can simplify the structure of the compressor 10, facilitate the processing of the compressor 10, and reduce the cost of the compressor 10.

[0056] In some embodiments, as Figure 2 As shown, the compressor 10 further includes a second inlet 54 , which communicates with the inlet of the second compression device 2 .

[0057] In some embodiments, the compressor 10 has a first operating state and a second operating state. When the compressor 10 is in the first operating state, the first compression device 1 compresses gas entering the first compression device 1 through a first inlet. The second compression device 2 compresses gas discharged from the first compression device 1 and compresses gas entering the second compression device 2 through a second inlet.

[0058] When the compressor 10 is in the second working state, the first compression device 1 operates at no load, and the second compression device 2 compresses the gas discharged from the first compression device 1 and the gas entering the second compression device 2 from the second inlet.

[0059] In this way, the compressor 10 can be switched between the first working state and the second working state, so that the first compression device 1 compresses the gas flowing from the first inlet to the first compression device 1, or the first compression device 1 is operated at no load, and the first compression device 1 is stopped from compressing the gas flowing from the first inlet to the first compression device 1, so as to improve the practicality of the compressor 10 and facilitate the use of the compressor 10.

[0060] In some embodiments, the thermal management system further includes an air conditioning system and a refrigerator system. The first inlet 53 of the compressor 10 is connected to the outlet of the air conditioning system, and the second inlet 54 of the compressor 10 is connected to the outlet of the refrigerator system. The outlet of the compressor 10 is connected to the inlet of the air conditioning system and the inlet of the refrigerator system.

[0061] It should be noted that the refrigeration demand of the refrigerator system is higher than that of the air-conditioning system, so the pressure of the refrigerant flowing out of the refrigerator system will be lower than the pressure of the refrigerant flowing out of the air-conditioning system.

[0062] In this way, when the refrigerator system and the air-conditioning system are running simultaneously, the refrigerant flowing out of the air-conditioning system can flow directly from the second inlet 54 into the compressor 10 at a higher pressure, and then into the second compression device 2.

[0063] The refrigerant flowing out of the refrigerator system flows into the compressor 10 from the first inlet 53 at a relatively low pressure, and is compressed into a refrigerant at a relatively high pressure by the first compression device 1 before entering the second compression device 2 for compression.

[0064] The higher-pressure refrigerant flowing into the second compression device 2 from the second inlet 54 and flowing into the second compression device 2 from the first compression device 1 will be compressed by the second compression device 2 and then flow to the refrigerator system and the air-conditioning system, realizing the circulation flow of the refrigerant and thus realizing the normal operation of the thermal management system.

[0065] Compared with driving the refrigerant circulation flow through only one compression device, when the first compression device 1 and the second compression device 2 work together, the first compression device 1 can compress the lower-pressure refrigerant into a higher-pressure refrigerant, which is mixed with the higher-pressure refrigerant entering the compressor 10 from the second inlet 54 and then enters the second compression device 2.

[0066] This can prevent the mixing of lower-pressure refrigerant and higher-pressure refrigerant, which would cause the intake pressure of the second compression device 2 to drop, thereby ensuring the intake pressure of the second compression device 2 and improving the energy efficiency of the compressor 10.

[0067] It should be noted that when the thermal management system is in different operating modes (for example, the refrigerator system is cooling, the air-conditioning system is cooling, or the air-conditioning system is cooling alone, or the required cooling effect of the refrigerator system or the air-conditioning system is different), the pressure requirement of the refrigerant discharged from the second compression device 2 is different, the operating power of the second compression device 2 is different, and the required intake pressure is also different.

[0068] Therefore, in some embodiments, the pressure of the refrigerant discharged from the first compression device 1 is equal to or close to the median of the range of the intake pressure of the second compression device 2 under different working conditions.

[0069] This can avoid a large difference between the pressure of the refrigerant flowing from the first compression device 1 to the second compression device 2 and the intake pressure required by the second compression device 2 under different working conditions, thereby ensuring the energy efficiency of the compressor 10.

[0070] The thermal management system has a first operating mode and a second operating mode. When the thermal management system is in the first operating mode, the compressor 10 is in a first working state.

[0071] When the thermal management system is in the second operating mode, the compressor 10 is in the second working state.

[0072] In this way, the working state of the compressor 10 can be switched so that the compressor 10 can adapt to different operating modes of the thermal management system, thereby ensuring the normal operation of the thermal management system.

[0073] In some embodiments, when the thermal management system is in the first operating mode, the air conditioning system is cooling and the refrigerator system is cooling.

[0074] At this time, the first compression device 1 is working and can compress the gas entering the first compression device 1 from the first inlet 53, and the second compression device 2 can compress the gas entering the second compression device 2 from the second inlet 54 and the gas discharged from the first compression device 1.

[0075] The gas flowing into the first compression device 1 from the first inlet 53 is the lower-pressure gas flowing out of the refrigerator system, and the gas flowing into the second compression device 2 from the second inlet 54 is the medium-pressure gas flowing out of the air-conditioning system. The gas discharged from the first compression device 1 is also medium-pressure gas. The medium-pressure gas is compressed into a higher-pressure gas by the second compression device 2 and part of it is supplied to the air-conditioning system and converted into medium-pressure gas, and the other part is supplied to the refrigerator system and converted into a lower-pressure gas, thereby achieving simultaneous cooling of the refrigerator system and the air-conditioning system.

[0076] When the thermal management system is in the second operating mode, the air conditioning system alone provides cooling. The gas flowing into the first compression device 1 from the first inlet 53 is medium-pressure gas flowing out of the air conditioning system. The gas flowing into the second compression device 2 from the second inlet 54 is also medium-pressure gas flowing out of the air conditioning system. The intake and exhaust pressures of the first compression device 1 are equal or similar. Therefore, when the thermal management system is in the second operating mode, the first compression device 1 operates at no load and does not compress gas.

[0077] The intermediate pressure gas flowing into the second compression device 2 from the second inlet 54 and the intermediate pressure gas discharged from the first compression device 1 can be compressed into higher pressure gas by the second compression device 2 and supplied to the air conditioning system to realize independent cooling of the air conditioning system.

[0078] In some embodiments, as Figure 3 、 Figure 4 As shown, Figure 4 This is another schematic cross-sectional view of the compressor 10 provided in an embodiment of the present application and parallel to the axial direction of the drive shaft 71 . The return channel 4 includes a first portion 41 , a second portion 42 and a third portion 43 .

[0079] The first end of the first portion 41 is in communication with the oil-liquid separation device 3. The first end of the second portion 42 is in communication with the second end of the first portion 41, and the second end of the second portion 42 is in communication with the first compression device 1. The first end of the third portion 43 is in communication with the second end of the first portion 41, and the second end of the third portion 43 is in communication with the second compression device 2.

[0080] Compared with setting up two separate channels to connect the oil separator to the first compression device 1 and the second compression device 2 respectively, when the reflux channel 4 includes the first part 41, the second part 42 and the third part 43, the lubricating liquid flowing out of the oil separator can first flow in the first part 41, and then part of it flows into the second part 42, and the other part flows into the third part 43. In this way, the length of the channel required for the lubricating liquid to flow can be shortened, thereby simplifying the structure of the reflux channel 4 and facilitating the setting of the reflux channel 4.

[0081] In some embodiments, as Figure 3 、 Figure 4 As shown, the return channel 4 further includes a back pressure chamber 44 , which is provided between the first compression device 1 and the second compression device 2 , and is communicated with the second end of the first portion 41 .

[0082] The first end of the second portion 42 is in communication with the back pressure chamber 44 . The first end of the third portion 43 is in communication with the back pressure chamber 44 .

[0083] In this way, the lubricating fluid can flow along the first portion 41 to the back pressure chamber 44 between the first compression device 1 and the second compression device 2 , and then flow to the first compression device 1 and the second compression device 2 respectively.

[0084] Compared with the case where the back pressure chamber 44 is located on the side of the second compression device 2 facing away from the first compression device 1, or is located on the side of the first compression device 1 facing away from the second compression device 2, when the back pressure chamber 44 is located between the first compression device 1 and the second compression device 2, the distance between the back pressure chamber 44 and the first compression device 1 and the second compression device 2 is shorter, which facilitates the lubricating fluid to flow to the first compression device 1 and the second compression device 2 at the same time.

[0085] In some embodiments, as Figure 3 、 Figure 4 As shown, the second compression device 2 includes a first mover 21 and a first stator 22. The first stator 22 is located on the side of the first mover 21 facing away from the first compression device 1. The back pressure chamber 44 is located between the first compression device 1 and the first mover 21.

[0086] The position of the first stator 22 relative to the first compression device 1 is fixed, and the medium in the back pressure chamber 44 can exert a force on the first mover 21 directed toward the first stator 22 .

[0087] In this way, the medium in the back pressure chamber 44 can limit the first mover 21 from moving away from the first stator 22 , so that the first mover 21 and the first stator 22 cooperate to compress the refrigerant, ensuring the normal function of the second compression device 2 .

[0088] In some embodiments, as Figure 3 、 Figure 4As shown, the first support member 5 is shell-shaped, the first compression device 1 is arranged inside the support member, and the second compression device 2 is located outside the support member and fixed to the side wall of the first support member 5.

[0089] In this way, the first compression device 1 can be protected by the first support member 5 to prevent debris from damaging the first compression device 1 and extend the service life of the first compression device 1.

[0090] In some embodiments, as Figure 3 As shown, along the axial direction of the transmission shaft 71, the first support member 5 includes a first sub-portion 55 and a second sub-portion 56. The first sub-portion 55 and the second sub-portion 56 are detachably connected.

[0091] In this way, during the assembly of the compressor 10, the first sub-section 55 and the second sub-section 56 can be disconnected to open the first support member 5, and after the first compression device 1 is installed in the first support member 5, the first sub-section 55 and the second sub-section 56 can be connected. This makes it easier to install the first compression device 1 in the first support member 5, thereby facilitating the assembly of the compressor 10. In some embodiments, as Figure 3 、 Figure 4 As shown, the first stator 22 is connected to the first support member 5 , and the back pressure chamber 44 is located between the first support member 5 and the first mover 21 .

[0092] By connecting the first stator 22 to the first support member 5 and locating the back pressure chamber 44 between the first support member 5 and the first mover 21 , the structure of the compressor 10 can be made more compact, thereby facilitating the spatial arrangement of the compressor 10 .

[0093] In some embodiments, the compressor 10 may further include a second support member connected to the first support member 5 and wrapping the second compression device 2. In this way, the second support member can provide protection for the second compression device 2 and extend the service life of the second compression device 2.

[0094] In some other embodiments, the first stator 22 is shell-shaped, and the first mover 21 is arranged inside the first stator 22, so that the first mover 21 can be protected by the first stator 22. This can extend the service life of the second compression device 2 while simplifying the structure of the compressor 10 and facilitating the installation and processing of the compressor 10.

[0095] In some embodiments, as Figure 4 、 Figure 5 As shown, Figure 5 This is a schematic cross-sectional view of the compressor 10 perpendicular to the axial direction of the transmission shaft 71 provided in an embodiment of the present application. A first connecting hole 51 and a second connecting hole 52 are provided on the side wall of the first support member 5 close to the first mover 21 .

[0096] One end of the first communicating hole 51 is in communication with the back pressure chamber 44 , and the other end of the first communicating hole 51 is in communication with the inner space of the first supporting member 5 .

[0097] One end of the second communicating hole 52 is communicated with the inner space of the first support member 5 , and the other end of the second communicating hole 52 is communicated with the air inlet of the second compression device 2 .

[0098] The first communication hole 51 , the inner space of the first support member 5 , and the second communication hole 52 form a third portion 43 .

[0099] In this way, the lubricating fluid can flow from the back pressure chamber 44 into the inner space of the first support member 5 and flow back into the second compression device 2 through the inner space of the first support member 5 , thereby lubricating the second compression device 2 .

[0100] Compared with setting up a pipe to connect the back pressure chamber 44 with the inlet of the second compression device 2, by setting the first connecting hole 51 and the second connecting hole 52, it is only necessary to set the first connecting hole 51 and the second connecting hole 52 on the first support member 5. This can simplify the structure of the return channel 4, facilitate the setting of the return channel 4, and also facilitate the processing of the compressor 10.

[0101] In addition, since the first compression device 1 is arranged in the internal space of the first support member 5, the outlet of the first compression device 1 can be directly connected to the internal space of the first support member 5, and the lubricating liquid and refrigerant flowing out of the first compression device 1 can enter the second compression device 2 through the second connecting hole 52.

[0102] In this way, there is no need to set up a pipeline between the first compression device 1 and the second compression device 2 to realize the transmission of refrigerant or lubricating liquid, which can further simplify the structure of the compressor 10 and facilitate the processing of the compressor 10.

[0103] For example, the number of the second communication hole 52 can be one or more, such as Figure 4 、 Figure 5 As shown, a plurality of second communication holes 52 can be arranged at intervals along the circumference of the transmission shaft 71 to facilitate the refrigerant and lubricating liquid in the first support member 5 to enter the second compression device 2.

[0104] In some embodiments, as Figure 4 、 Figure 5 As shown, a second communication groove 57 is further defined on a side of the first support member 5 near the first mover 21. One end of the second communication groove 57 communicates with the back pressure chamber 44, and the other end of the second communication groove 57 communicates with the first communication hole 51. The first communication hole 51, the interior space of the first support member 5, the second communication hole 52, and the second communication groove 57 form the third portion 43.

[0105] This makes it easy to adjust the position of the first communicating hole 51 and facilitates the arrangement of the first communicating hole 51 .

[0106] In some embodiments, as Figure 5 As shown, the compressor 10 further includes a first flow regulating element 6 , which is disposed in the first communicating hole 51 .

[0107] By setting the first flow regulating element 6, the amount of lubricating fluid flowing from the back pressure chamber 44 to the internal space of the first support member 5 can be adjusted. When the pressure of the refrigerant and the lubricating fluid between the first mover 21 and the first stator 22 is low, the amount of lubricating fluid flowing from the back pressure chamber 44 to the internal space of the first support member 5 can be increased to reduce the pressure in the back pressure chamber 44, thereby avoiding excessive pressure in the back pressure chamber 44 causing the first stator 22 and the first mover 21 to abut against each other, resulting in the first mover 21 being unable to rotate relative to the first stator 22.

[0108] When the pressure of the refrigerant and lubricating fluid between the first mover 21 and the first stator 22 is high, the amount of lubricating fluid flowing from the back pressure chamber 44 to the internal space of the first support member 5 can be reduced to increase the pressure in the back pressure chamber 44, thereby avoiding the back pressure chamber 44 being too low, causing the first stator 22 and the first mover 21 to separate, and further causing leakage of the refrigerant and lubricating fluid between the first mover 21 and the first stator 22, so as to ensure the normal function of the second compression device 2.

[0109] For example, the first flow regulating element 6 may be a throttle valve, a speed regulating valve, a throttle channel, etc.

[0110] In some embodiments, as Figure 3 、 Figure 6 As shown, Figure 6 This is another cross-sectional schematic diagram of the compressor 10 provided in an embodiment of the present application, perpendicular to the axial direction of the transmission shaft 71 , in which the first compression device 1 is connected to the first support member 5 .

[0111] Compressor 10 also includes a drive shaft 71 connected to first compression device 1 and configured to drive first compression device 1. Drive shaft 71 extends through the sidewall of first support member 5 facing first mover 21 and communicates with backpressure chamber 44. At least a portion of second portion 42 is disposed on drive shaft 71.

[0112] Since the drive shaft 71 is connected to the first compression device 1, at least a portion of the second part 42 is arranged on the drive shaft 71, which can reduce the length of the additional pipeline required between the back pressure chamber 44 and the first compression device 1, thereby simplifying the structure of the compressor 10 and facilitating the communication between the second part 42 and the first compression device 1.

[0113] In some embodiments, as Figure 3 、 Figure 6 As shown, the first compression device 1 includes a second mover 11 and a second stator 12. The second stator 12 is connected to the first support member 5.

[0114] The second portion 42 includes a first channel 421 and a second channel. The first channel 421 is provided on the transmission shaft 71 , and one end of the first channel 421 is communicated with the back pressure chamber 44 .

[0115] By providing the first channel 421 on the transmission shaft 71 , the lubricating liquid can be easily transferred along the transmission shaft 71 to the first compression device 1 , thereby facilitating the provision of the reflux channel 4 .

[0116] In some embodiments, the second portion 42 further includes a second channel provided in the second mover 11 , one end of the second channel communicating with the other end of the first channel 421 , and the other end of the second channel communicating with the compression chamber between the second mover 11 and the second stator 12 .

[0117] In this way, the lubricating fluid in the back pressure chamber 44 can flow through the first channel 421 to the second channel, and then directly flow through the second mover 11 into the compression chamber between the second mover 11 and the second stator 12, thereby lubricating the first compression device 1. At the same time, there is no need to set up additional pipes or the like between the transmission shaft 71 and the first compression device 1 to transmit the lubricating fluid, which can simplify the structure of the compressor 10.

[0118] In some other embodiments, the second channel is provided between the second mover 11 and the transmission shaft 71. In this way, after the lubricating fluid flows out of the first channel 421, it can flow along the gap between the second mover 11 and the transmission shaft 71, and then flow into the compression chamber between the second mover 11 and the second stator 12, thereby lubricating the first compression device 1.

[0119] In this way, the first compression device 1 can also be lubricated and the structure of the compressor 10 can be simplified.

[0120] In some embodiments, as Figure 3 、 Figure 6 As shown, the first channel 421 includes a first sub-channel 4211 and a second sub-channel 4212. The first sub-channel 4211 is in communication with the back pressure chamber 44, and the second sub-channel 4212 is in communication between the first sub-channel 4211 and the second channel. The cross-sectional area of ​​the second sub-channel 4212 is smaller than that of the first sub-channel 4211. Of course, in other embodiments, the cross-sectional area of ​​the second sub-channel 4212 is larger than that of the first sub-channel 4211, or a throttling element may be provided in the first channel 421 or the second channel.

[0121] In this way, when the lubricating fluid flows through the second sub-channel 4212, it can be throttled and reduced in pressure through the second sub-channel 4212, so that the pressure of the lubricating fluid entering the first compression device 1 from the second channel and the lubricating fluid entering the first compression device 1 from the first inlet 53 are equal or similar, thereby ensuring the pressure of the lubricating fluid flowing into the first compression device 1 and thus ensuring the normal operation of the first compression device 1.

[0122] At the same time, part of the refrigerant will flow with the lubricating liquid. Through the setting of the second sub-channel 4212, the pressure of the lubricating liquid can be reduced while the refrigerant attached to the lubricating liquid is separated from the lubricating liquid and enters the first compression device 1 at an appropriate pressure. In this way, the intake pressure of the first compression device 1 can be guaranteed, and the normal operation of the first compression device 1 can be further guaranteed.

[0123] In some embodiments, as Figure 3 、 Figure 4 As shown, the transmission shaft 71 is connected to the first mover 21 , and the transmission shaft 71 is used to drive the first mover 21 to rotate.

[0124] In this way, the first compression device 1 and the second compression device 2 can be driven simultaneously by the transmission shaft 71. Compared with setting two driving parts to drive the first compression device 1 and the second compression device 2 respectively, the structure of the compressor 10 can be simplified and the processing and spatial setting of the compressor 10 can be facilitated.

[0125] In some embodiments, the first sub-channel 4211 extends along the axial direction of the transmission shaft 71 and penetrates to the end of the transmission shaft 71 close to the second compression device 2 , thereby facilitating communication between the first sub-channel 4211 and the back pressure chamber 44 .

[0126] In some embodiments, the second sub-channel 4212 extends in a direction perpendicular to the axial direction of the transmission shaft 71 and penetrates to two opposite side surfaces of the transmission shaft 71 .

[0127] In this way, during the rotation of the transmission shaft 71, after the lubricating fluid flows to the second sub-channel 4212, it will be affected by the centrifugal force during the rotation of the transmission shaft 71 and thrown out from both ends of the second sub-channel 4212. This can facilitate the flow of the lubricating fluid to the second channel, so that the lubricating fluid can flow more smoothly in the reflux channel 4.

[0128] In some embodiments, as Figure 3 、 Figure 4 As shown, the central axis of the first mover 21 is eccentrically arranged relative to the central axis of the transmission shaft 71 .

[0129] This makes it easier to compress the gas in the compression chamber between the first mover 21 and the first stator 22 during the rotation of the first mover 21 , thereby realizing the gas compression function of the second compression device 2 .

[0130] In some embodiments, as Figure 3 、 Figure 4 As shown, the second compression device 2 further includes a counterweight 73 , which is connected to the transmission shaft 71 , and the center of gravity of the counterweight 73 is located on the side of the central axis of the transmission shaft 71 facing away from the central axis of the first mover 21 .

[0131] By setting the counterweight block 73 and making the center of gravity of the counterweight block 73 located on the side of the central axis of the transmission shaft 71 that is away from the central axis of the first mover 21, the distance between the center of gravity of the overall structure composed of the counterweight block 73 and the first mover 21 and the rotation axis of the transmission shaft 71 can be made smaller than the distance between the center of gravity of the first mover 21 and the rotation axis of the transmission shaft 71.

[0132] In this way, during the rotation of the transmission shaft 71, the overall structure composed of the counterweight block 73 and the first mover 21 can rotate more stably with the transmission shaft 71, so as to improve the stability of the first mover 21 during rotation, improve the stability of the second compression device 2 during operation, and ensure the stable operation of the compressor 10.

[0133] In some embodiments, the second compression device 2 is a scroll compressor. Of course, in other embodiments, the second compression device 2 can also be a rotor compressor or other types of compressors.

[0134] The scroll compressor has a simple structure and is easy to connect to the first end of the transmission shaft 71 , thereby facilitating the spatial arrangement of the second compression device 2 .

[0135] In some embodiments, as Figure 3 、 Figure 4 As shown, the compressor 10 further includes a connecting rod 72, which is disposed in the back pressure chamber 44 and connected to the transmission shaft 71. The axis of the connecting rod 72 is located on one side of the axis of the transmission shaft 71 in the radial direction. The first mover 21 is connected to the connecting rod 72.

[0136] Compared with directly connecting the first mover 21 to the transmission shaft 71, by setting the connecting rod 72, the position of the first mover 21 relative to the transmission shaft 71 can be easily adjusted, so that the transmission shaft 71 can drive the first mover 21 to rotate, and it is easy to realize the transmission connection between the transmission shaft 71 and the first mover 21.

[0137] For example, the axial direction of the connecting rod 72 is consistent with the axial direction of the transmission shaft 71 , so that the connecting rod 72 and the first mover 21 can be connected easily, and the connecting rod 72 can drive the first mover 21 to rotate.

[0138] For example, the axial direction of the connecting rod 72 may intersect with the axial direction of the transmission shaft 71 .

[0139] In some embodiments, as Figure 3 As shown, the second portion 42 further includes a third channel 721 , which is provided on the connecting rod 72 . The third channel 721 is connected between the first channel 421 and the back pressure chamber 44 .

[0140] In this way, the lubricating liquid can be transmitted to the first channel 421 through the third channel 721 , thereby preventing the connecting rod 72 from blocking the first channel 421 and facilitating the installation of the connecting rod 72 .

[0141] In some embodiments, as Figure 3 As shown, the connecting rod 72 partially extends into the first channel 421 and is interference fit with the transmission shaft 71.

[0142] The connecting rod 72 partially extends into the first channel 421 to facilitate the communication between the third channel 721 and the first channel 421, and by making the connecting rod 72 and the transmission shaft 71 have an interference fit, the installation of the connecting rod 72 can be facilitated without the need for an additional connecting structure, which can also simplify the structure of the compressor 10.

[0143] In some embodiments, as Figure 3 、 Figure 5 As shown, the counterweight 73 includes a counterweight portion 731, which is connected to the transmission shaft 71 and is located on a side of the rotation axis of the transmission shaft 71 that is opposite to the axis of the connecting rod 72. In other embodiments, the counterweight portion 731 may also be connected to the connecting rod 72, or may be connected to both the transmission shaft 71 and the connecting rod 72.

[0144] By providing the counterweight 731 and positioning it on the side of the rotation axis of the transmission shaft 71 that faces away from the axis of the connecting rod 72, the distance between the center of gravity of the overall structure consisting of the counterweight 731, the connecting rod 72, and the first mover 21 and the rotation axis of the transmission shaft 71 can be made smaller than the distance between the center of gravity of the first mover 21 and the rotation axis of the transmission shaft 71. This improves the stability of the first mover 21 during rotation, improves the stability of the second compression device 2 during operation, and ensures stable operation of the compressor 10.

[0145] In some embodiments, as Figure 3 As shown, the counterweight 73 further includes a connecting portion 732 , to which the counterweight 731 is connected, and which is also connected to the transmission shaft 71 . The connecting portion 732 is connected to the connecting rod 72 .

[0146] Compared with the case where the counterweight portion 731 is only connected to the connecting portion 732, when the counterweight portion 731 is connected to the connecting portion 732 and connected to the transmission shaft 71, the counterweight portion 731, the connecting portion 732, the connecting rod 72 and the transmission shaft 71 can be more stably connected together, thereby improving the stability of the transmission shaft 71 when driving the first mover 21 to rotate, thereby ensuring the stable operation of the compressor 10.

[0147] In some embodiments, as Figure 3 、 Figure 4 As shown, the oil-liquid separation device 3 is provided with an oil-liquid separation chamber 31, and the oil-liquid separation chamber 31 has a first position and a second position. The first position is connected to the outlet of the second compression device 2, and the second position is connected to the first part 41. The first position is located above the second position.

[0148] In this way, after the lubricating liquid is separated from the compressed gas, it can be gathered at the second position under the action of gravity, and thus directly flow into the first part 41 , making it easier for the lubricating liquid to flow into the reflux channel 4 .

[0149] In some embodiments, as Figure 3 As shown, the first portion 41 includes a third sub-channel 411 and a first communicating groove 412 . The third sub-channel 411 is provided at the portion where the first stator 22 is connected to the first support member 5 , and one end of the third sub-channel 411 is communicated with the oil separation chamber 31 .

[0150] The first connecting groove 412 is provided on a side of the first support member 5 close to the first mover 21 and facing the first stator 22 . The first connecting groove 412 extends radially along the transmission shaft 71 and connects the other end of the third sub-channel 411 with the back pressure chamber 44 .

[0151] By providing the third sub-channel 411 at the portion where the first stator 22 and the first support member 5 are connected, the lubricating fluid can be easily flowed between the first stator 22 and the first support member 5 and then into the back pressure chamber 44 through the first connecting groove 412 .

[0152] Furthermore, by extending the first connecting groove 412 radially along the transmission shaft 71, the third sub-channel 411 can be positioned on one side of the first mover 21 in the radial direction of the transmission shaft 71, thereby preventing the first portion 41 from interfering with the fit between the first mover 21 and the first stator 22. This facilitates the flow of lubricating fluid into the back-pressure chamber 44 while ensuring the normal function of the second compression device 2, thus facilitating the provision of the return channel 4.

[0153] In some embodiments, as Figure 3 As shown, the compressor 10 further includes a second flow regulating element 8 , which is disposed at the first portion 41 .

[0154] In this way, when the lubricating fluid flows through the first part 41, it can be throttled and reduced in pressure through the second flow regulating element 8, so that the pressure of the lubricating fluid entering the back pressure chamber 44 from the first part 41 through the wall is too high, thereby ensuring that the lubricating fluid and refrigerant in the back pressure chamber 44 exert a force of appropriate size on the first mover 21, thereby ensuring the normal operation of the second compression device 2.

[0155] For example, the second flow regulating element 8 may be a throttle valve, a speed regulating valve, a throttle channel, etc.

[0156] In some embodiments, as Figure 3 、 Figure 4 As shown, the compressor 10 further includes a driving device 74 , which is used to drive the first compression device 1 and the second compression device 2 to work, and the first compression device 1 and the second compression device 2 are located on the same side of the driving device 74 .

[0157] Compared with when the first compression device 1 and the second compression device 2 are located on opposite sides of the drive device 74, when the first compression device 1 and the second compression device 2 are located on the same side of the drive device 74, the oil circuit for supplying lubricating fluid to the first compression device 1 and the second compression device 2 does not need to bypass the drive device 74.

[0158] This can shorten the length of the oil circuit on the compressor 10, thereby facilitating the setting of the oil circuit for transporting lubricating liquid on the compressor 10, and facilitating the supply of lubricating liquid to the first compression device 1 and the second compression device 2, so as to improve the lubrication effect of the first compression device 1 and the second compression device 2. At the same time, it can also simplify the structure of the compressor 10 and facilitate the processing of the compressor 10.

[0159] In some embodiments, as Figure 3 As shown, the transmission shaft 71 is connected to the driving device 74 , and both the first compression device 1 and the second compression device 2 are connected to the transmission shaft 71 . The driving device 74 is used to drive the first compression device 1 and the second compression device 2 to work with the help of the transmission shaft 71 .

[0160] In this way, the driving device 74 can drive the transmission shaft 71 to rotate, so that the transmission shaft 71 drives the first compression device 1 and the second compression device 2 to work.

[0161] Compared with the first compression device 1 and the second compression device 2 being both connected to the drive device 74, the setting of the transmission shaft 71 can facilitate the setting of the first compression device 1 and the second compression device 2 on the same side of the drive device 74, thereby facilitating the supply of lubricating liquid to the first compression device 1 and the second compression device 2.

[0162] In some embodiments, as Figure 3 、 Figure 4 As shown, the two ends of the transmission shaft 71 are respectively the first end and the second end, and the first end and the second end can be rotatably connected to the support member, the second compression device 2 is connected to the first end and fixed to the support member, and the first compression device 1 is connected to the middle part of the transmission shaft 71.

[0163] Along the axial direction of the transmission shaft 71, the distance from the first compression device 1 to the first end is smaller than the distance from the first compression device 1 to the second end. Of course, in some other embodiments, the distance from the first compression device 1 to the first end may also be larger than the distance from the first compression device 1 to the second end.

[0164] As a result, the overall structure composed of the first compression device 1 , the second compression device 2 and the transmission shaft 71 has a larger mass at the first end of the transmission shaft 71 and a smaller mass at the second end of the transmission shaft 71 .

[0165] During the rotation of the transmission shaft 71, one end of the transmission shaft 71 has a higher mass than the second end of the transmission shaft 71, and the amplitude of the shaking may be smaller. Therefore, the second compression device 2 connected to the first end and the first compression device 1 arranged near the first end will also have higher stability during operation. In this way, the working stability of the first compression device 1 and the second compression device 2 can be improved, so as to improve the working stability of the compressor 10.

[0166] In some embodiments, as Figure 3 As shown, along the axial direction of the transmission shaft 71 , the driving device 74 is located between the second end and the first compression device 1 .

[0167] Compared with the case where the driving device 74 is located on the side of the second end of the transmission shaft 71 facing away from the first end of the transmission shaft 71, when the driving device 74 is located between the second end and the first compression device 1, the axial size of the driving device 74, the transmission shaft 71 and the second compression device 2 in the transmission shaft 71 can be reduced, thereby saving the space required for the compressor 10 and facilitating the spatial setting of the compressor 10.

[0168] In some embodiments, the driving device 74 includes a third stator and a third mover, wherein the third stator is fixed to the first support member 5, and the third mover is fixed to the transmission shaft 71. Of course, in other embodiments, the driving device 74 may also include a rotary motor, and the output shaft of the rotary motor is connected to the transmission shaft 71.

[0169] In this way, the third mover can be connected to the radial surface of the transmission shaft 71, so that the driving device 74 can be arranged between the second end and the first compression device 1, which facilitates the spatial arrangement of the driving device 74.

[0170] In some embodiments, as Figure 3 As shown, the second end of the transmission shaft 71 is connected to the first sub-section 55, and the first end of the transmission shaft 71 is connected to the second sub-section 56. The third stator is connected to the first sub-section 55, and the second stator 12 is connected to the second sub-section 56.

[0171] In some embodiments, the second stator 12 is provided with a compression chamber and a mounting hole communicating with the compression chamber, and the second mover 11 is disposed within the compression chamber. The transmission shaft 71 passes through the mounting hole and is connected to the second mover 11. Of course, in other embodiments, the first compression device 1 may also be a scroll compressor or other types of compressors.

[0172] In this manner, the transmission shaft 71 can be inserted through the second stator 12 and connected to the second mover 11 to drive the rotation of the second mover 11. This makes it relatively easy to position the first compression device 1 in the middle of the transmission shaft 71, without requiring additional structure on the transmission shaft 71 to facilitate transmission between the transmission shaft 71 and the second mover 11. This facilitates the operation of the first and second compression devices 1 through the transmission shaft 71, simplifies the structure of the transmission shaft 71, and facilitates the installation and spatial arrangement of the compressor 10.

[0173] In some embodiments, the first compression device 1 is a rotary compressor. Of course, in other embodiments, the first compression device 1 may also be a scroll compressor or other types of compressors.

[0174] In some embodiments, when the displacement of the first compression device 1 is greater than or equal to 4cc and less than or equal to 10cc, the difference between the diameter of the mounting hole and the diameter of the portion of the drive shaft 71 located in the mounting hole is greater than or equal to 0.08mm and less than or equal to 0.09mm.

[0175] Compared with the first compression device 1 having a displacement greater than 10cc, when the displacement of the first compression device 1 is greater than or equal to 4cc and less than or equal to 10cc, the displacement of the first compression device 1 is smaller, and the diameter of the mounting hole and the diameter of the portion of the drive shaft 71 located in the mounting hole are also smaller.

[0176] At this time, the difference between the diameter of the mounting hole and the diameter of the portion of the transmission shaft 71 located in the mounting hole can be set to be greater than or equal to 0.08 mm and less than or equal to 0.09 mm.

[0177] In this way, there is a sufficient gap between the transmission shaft 71 and the second stator 12, which can prevent the second stator 12 and the transmission shaft 71 from contacting each other and causing the first compression device 1 to get stuck. At the same time, the gap between the transmission shaft 71 and the second stator 12 will not be too large, thereby preventing the gas in the compression chamber from leaking from the gap between the transmission shaft 71 and the second stator 12, thereby ensuring the normal function of the first compression device 1.

[0178] It should be noted that after the lubricating fluid enters the compression chamber, in addition to lubricating the second mover 11 and the second stator 12, it also flows to the internal space of the support by flowing to the gap between the drive shaft 71 and the second stator 12 to lubricate the second stator 12 and the drive shaft 71. At the same time, it can form a sealing structure similar to an oil film between the second stator 12 and the drive shaft 71, thereby sealing the gap between the drive shaft 71 and the second stator 12, thereby preventing gas leakage.

[0179] In some embodiments, when the displacement of the first compression device 1 is greater than 10 cc, the difference between the diameter of the mounting hole and the diameter of the portion of the transmission shaft 71 located in the mounting hole is greater than 0.09 mm and less than or equal to 0.1 mm.

[0180] Compared with the displacement of the first compression device 1 greater than or equal to 4cc and less than or equal to 10cc, when the displacement of the first compression device 1 is greater than 10cc, the displacement of the first compression device 1 is larger, and the diameter of the mounting hole and the diameter of the part of the drive shaft 71 located in the mounting hole are also larger.

[0181] In this case, the gap between the second stator 12 and the transmission shaft 71 needs to be appropriately increased so that the difference between the diameter of the mounting hole and the diameter of the portion of the transmission shaft 71 located in the mounting hole is greater than 0.09 mm and less than or equal to 0.1 mm.

[0182] This is to avoid the first compression device 1 being stuck due to contact between the second stator 12 and the transmission shaft 71, and to prevent the gas in the compression chamber from leaking from the gap between the transmission shaft 71 and the second stator 12, thereby ensuring the normal function of the first compression device 1.

[0183] In some embodiments, as Figure 3 As shown, the compressor 10 further includes a first bearing 75 and a second bearing 76, both of which are disposed within the back pressure chamber 44. The first bearing 75 is sleeved on the transmission shaft 71 and connected to the side wall of the first support member 5 near the first mover 21. The second bearing 76 is sleeved on the connecting rod 72 and connected to the first mover 21.

[0184] In this way, the transmission shaft 71 and the connecting rod 72 can be supported by the first bearing 75 and the second bearing 76, and lubrication can be performed between the transmission shaft 71 and the first support member 5 and between the connecting rod 72 and the first mover 21 to reduce the friction between the transmission shaft 71 and the first support member 5, and reduce the friction between the connecting rod 72 and the first mover 21, thereby extending the service life of the transmission shaft 71, the connecting rod 72, the first support member 5 and the first mover 21.

[0185] In addition, since the first bearing 75 and the second bearing 76 are both disposed in the back pressure chamber 44 , the lubricating liquid can also lubricate the first bearing 75 and the second bearing 76 , thereby extending the service life of the first bearing 75 and the second bearing 76 .

[0186] In some embodiments, as Figure 3 As shown, the compressor 10 further includes a third bearing 77, which is disposed within the first support member 5. The third bearing 77 is sleeved around the second end of the transmission shaft 71 and connected to the first support member 5. The third bearing 77 can thus further support the transmission shaft 71, thereby improving the stability of the transmission shaft 71 during rotation.

[0187] At the same time, when the lubricating liquid flows into the first support member 5 , it can also lubricate the third bearing 77 , so as to extend the service life of the third bearing 77 .

[0188] In some embodiments, the side wall of the first support member 5 close to the first mover 21 can be separated from other parts of the first support member 5, so as to facilitate the installation of the driving device 74, the transmission shaft 71 and the first compression device 1 in the internal space of the first support member 5.

[0189] In some embodiments, as Figure 3 As shown, the compressor 10 further includes an electrical control box 78, which is connected to the end of the first support member 5 facing away from the second compression device 2. The electrical control box 78 is electrically connected to the drive device 74 and is used to control the operation or shutdown of the drive device 74. This facilitates the control of the operating state of the compressor 10 and meets the operating requirements of the thermal management system.

[0190] In the description of the embodiments of the present application, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0191] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A compressor (10), characterized in that: The invention comprises a first compression device (1), a second compression device (2) and an oil-liquid separation device (3) which are sequentially arranged from a first inlet (53) of the compressor (10) to an outlet of the compressor (10); the oil-liquid separation device (3) is used to separate lubricating liquid from compressed gas discharged from the second compression device (2); A return channel (4) is provided between the oil-liquid separation device (3), the second compression device (2) and the first compression device (1), and the return channel (4) is suitable for guiding the lubricating liquid to flow back from the oil-liquid separation device (3) to the second compression device (2) and the first compression device (1).

2. The compressor (10) according to claim 1, characterized in that The reflux channel (4) includes a first portion (41), a second portion (42) and a third portion (43); The first end of the first part (41) is in communication with the oil-liquid separation device (3); the first end of the second part (42) is in communication with the second end of the first part (41), and the second end of the second part (42) is in communication with the first compression device (1); the first end of the third part (43) is in communication with the second end of the first part (41), and the second end of the third part (43) is in communication with the second compression device (2).

3. The compressor (10) according to claim 2, characterized in that The return channel (4) further comprises a back pressure chamber (44), the back pressure chamber (44) being provided between the first compression device (1) and the second compression device (2), and the back pressure chamber (44) being in communication with the second end of the first portion (41); The first end of the second part (42) is in communication with the back pressure chamber (44); the first end of the third part (43) is in communication with the back pressure chamber (44).

4. The compressor (10) according to claim 3, characterized in that The second compression device (2) comprises a first mover (21) and a first stator (22), wherein the first stator (22) is located on a side of the first mover (21) facing away from the first compression device (1); the back pressure chamber (44) is located between the first compression device (1) and the first mover (21); The position of the first stator (22) relative to the first compression device (1) is fixed, and the medium in the back pressure chamber (44) can exert a force on the first mover (21) directed toward the first stator (22).

5. The compressor (10) according to claim 4, characterized in that It also includes a first support member (5), which is in a shell shape; the first support member (5) and the first compression device (1) are located on the same side of the second compression device (2), and the first compression device (1) is located inside the first support member (5); The first stator (22) is connected to the first support member (5), and the back pressure chamber (44) is located between the first support member (5) and the first mover (21).

6. The compressor (10) according to claim 5, characterized in that A first communicating hole (51) and a second communicating hole (52) are provided on a side wall of the first support member (5) close to the first mover (21); One end of the first communicating hole (51) is in communication with the back pressure chamber (44), and the other end of the first communicating hole (51) is in communication with the internal space of the first supporting member (5); One end of the second communicating hole (52) is in communication with the inner space of the first supporting member (5), and the other end of the second communicating hole (52) is in communication with the air inlet of the second compression device (2); The first communicating hole (51), the inner space of the first supporting member (5), and the second communicating hole (52) form the third portion (43).

7. The compressor (10) according to claim 6, characterized in that It also includes a first flow regulating element (6), which is arranged in the first communicating hole (51).

8. The compressor (10) according to claim 5, characterized in that The first compression device (1) comprises a second mover (11) and a second stator (12); the second stator (12) is connected to the first support member (5); The compressor (10) further comprises a transmission shaft (71), the transmission shaft (71) being connected to the second mover (11), and the transmission shaft (71) being used to drive the second mover (11) to rotate; the transmission shaft (71) is passed through a side wall of the first support member (5) facing the first mover (21), and the transmission shaft (71) is communicated with the back pressure chamber (44); at least a portion of the second portion (42) is provided on the transmission shaft (71).

9. The compressor (10) according to claim 8, characterized in that The second part (42) comprises: A first channel (421) is provided on the transmission shaft (71), one end of the first channel (421) is communicated with the back pressure chamber (44), and the other end of the first channel (421) is communicated with the compression chamber between the second mover (11) and the second stator (12).

10. The compressor (10) according to claim 9, characterized in that The second part (42) further comprises: A second channel is provided between the second mover (11) and / or the second mover (11) and the transmission shaft (71), one end of the second channel is communicated with the other end of the first channel (421), and the other end of the second channel is communicated with the compression chamber between the second mover (11) and the second stator (12).

11. The compressor (10) according to claim 8, characterized in that The first channel (421) comprises a first sub-channel (4211) and a second sub-channel (4212), the first sub-channel (4211) being in communication with the back pressure chamber (44), and the second sub-channel (4212) being in communication between the first sub-channel (4211) and the second channel; The cross-sectional area of ​​the second sub-channel (4212) is smaller than the cross-sectional area of ​​the first sub-channel (4211).

12. The compressor (10) according to claim 8, characterized in that The transmission shaft (71) is connected to the first mover (21), and the transmission shaft (71) is used to drive the first mover (21) to rotate.

13. The compressor (10) according to claim 12, characterized in that Also includes: a connecting rod (72), the connecting rod (72) being disposed in the back pressure chamber (44) and connected to the transmission shaft (71); The axis of the connecting rod (72) is located on one side of the axis of the transmission shaft (71) in the radial direction; the first mover (21) is connected to the connecting rod (72).

14. The compressor (10) according to claim 13, characterized in that The second part (42) further includes a third channel (721), and the third channel (721) is provided on the connecting rod (72); the third channel (721) is connected between the first channel (421) and the back pressure chamber (44).

15. The compressor (10) according to claim 13, characterized in that The second compression device (2) further includes a counterweight block (73), the counterweight block (73) including a counterweight portion (731), the counterweight portion (731) being connected to the transmission shaft (71) and / or the connecting rod (72), and being located on a side of the rotation axis of the transmission shaft (71) facing away from the axis of the connecting rod (72).

16. The compressor (10) according to claim 15, characterized in that The counterweight block (73) further includes a connecting portion (732), the counterweight portion (731) is connected to the connecting portion (732), and is also connected to the transmission shaft (71); the connecting portion (732) is connected to the connecting rod (72).

17. The compressor (10) according to claim 2, characterized in that The oil-liquid separation device (3) is provided with an oil-liquid separation chamber (31), and the oil-liquid separation chamber (31) has a first position and a second position, the first position is connected to the outlet of the second compression device (2), the second position is connected to the first part (41), and the first position is located above the second position.

18. The compressor (10) according to claim 2, characterized in that It also includes a second flow regulating element (8), which is arranged on the first part (41).

19. The compressor (10) according to claim 1, characterized in that It also includes a second inlet (54), which is communicated with the inlet of the second compression device (2).

20. The compressor (10) according to claim 19, characterized in that The compressor (10) has a first working state and a second working state; When the compressor (10) is in the first working state, the first compression device (1) compresses gas entering the first compression device (1) from the first inlet (53); the second compression device (2) compresses gas discharged from the first compression device (1) and compresses gas entering the second compression device (2) from the second inlet (54); When the compressor (10) is in the second working state, the first compression device (1) operates at no load; the second compression device (2) compresses the gas discharged from the first compression device (1) and compresses the gas entering the second compression device (2) from the second inlet (54).

21. A thermal management system, characterized in that: Comprising the compressor (10) according to any one of claims 1-20.

22. The thermal management system according to claim 21, wherein: The compressor (10) further comprises a second inlet (54) which is in communication with an inlet of the second compression device (2); The thermal management system further includes an air-conditioning system and a refrigerator system, wherein the first inlet (53) is connected to the outlet of the air-conditioning system, and the second inlet (54) is connected to the outlet of the refrigerator system; and the outlet of the compressor (10) is connected to the inlet of the air-conditioning system and the inlet of the refrigerator system.

23. The thermal management system according to claim 22, wherein: The thermal management system has a first operating mode and a second operating mode; When the thermal management system is in the first operating mode, the compressor (10) is in a first working state, the first compression device (1) compresses gas entering the first compression device (1) from the first inlet (53); the second compression device (2) compresses gas discharged from the first compression device (1) and compresses gas entering the second compression device (2) from the second inlet (54); When the thermal management system is in the second operating mode, the compressor (10) is in a second working state, the first compression device (1) operates at no load; the second compression device (2) compresses the gas discharged from the first compression device (1) and compresses the gas entering the second compression device (2) from the second inlet (54).

24. A vehicle (100), characterized in that It comprises the compressor (10) according to any one of claims 1 to 20, or the thermal management system according to any one of claims 21 to 23.

Images