Electric compressor, air conditioning system and vehicle

Abstract

The invention discloses an electric compressor, an air conditioning system and a vehicle. The electric compressor comprises a shell assembly, the shell assembly comprises a first shell and a support, a first containing cavity is defined between the first shell and the support, and a liquid storage cavity is formed in the bottom of the first containing cavity; the compression mechanism is provided with a pump suction port; an air suction and liquid return structure is arranged on the support and comprises an air suction channel and an oil return hole, one end of the air suction channel is communicated with the first containing cavity and located above the liquid storage cavity, the other end of the air suction channel is communicated with the pump suction opening, the oil return inlet end of the oil return hole is communicated with the liquid storage cavity, and the oil return outlet end of the oil return hole is communicated with the air suction channel. According to the electric compressor, the liquid refrigerant can be prevented from directly entering the compression mechanism, the liquid impact generation probability is reduced, the operation load of the electric compressor is reduced, and internal abrasion generated by liquid impact is avoided. The oil return hole can guarantee smoothness of backflow lubricating oil, and accumulation of the lubricating oil is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an electric compressor, an air-conditioning system and a vehicle. Background Art

[0002] The electric compressor is the core component of vehicle refrigeration equipment. It is a positive displacement compressor with high efficiency, low noise and smooth operation. As the third-generation vehicle compressor, it is widely used in automobile air-conditioning systems. In recent years, with the development of new energy vehicles, automobiles have further improved their requirements for air-conditioning compressor noise, vibration and durability. Electric compressors, such as scroll compressors and rolling rotor compressors, need to provide lubricating oil to lubricate the friction pairs in the electric compressor during use to reduce the noise generated when the friction pairs are working.

[0003] In electric compressors, the air intake hole of the compression mechanism is usually opened at the bottom of the mechanism. The liquid refrigerant and refrigeration oil returning from the system will directly enter the compression mechanism, which is easy to cause liquid hammer, causing the compressor load to increase sharply and easily wear the internal structure. Too much liquid refrigerant entering the compression mechanism will also cause lubrication failure and wear. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide an electric compressor to improve the liquid hammer problem of the electric compressor.

[0005] The present invention further provides an air conditioning system having the electric compressor.

[0006] The present invention also provides a vehicle having the above air conditioning system.

[0007] According to the first aspect of the present invention, the electric compressor comprises: a shell assembly, the shell assembly comprises a first shell and a bracket, a first accommodating chamber is defined between the first shell and the bracket, a refrigerant inlet connected to the first accommodating chamber is provided on the first shell, and the bottom of the first accommodating chamber constitutes a liquid storage chamber; a compression mechanism, the compression mechanism is connected to the bracket, and a pump suction port is provided on the compression mechanism; wherein, an air suction and liquid return structure is provided on the bracket, the air suction and liquid return structure comprises an air suction channel and an oil return hole, one end of the air suction channel is an air suction inlet, and the other end of the air suction channel is connected to the pump suction port, the air suction inlet is connected to the first accommodating chamber, and the air suction inlet is located above the liquid storage chamber in the gravity direction, and the two ends of the oil return hole are an oil return inlet and an oil return outlet, the oil return inlet is connected to the liquid storage chamber, and the oil return outlet is connected to the air suction channel.

[0008] According to the electric compressor of the present invention, the setting of the bracket is to facilitate assembly on the one hand, and to improve the overall structural rigidity of the shell assembly on the other hand, and increase its anti-seismic, anti-bending and anti-torsion performance. The air intake channel is arranged in this way, in conjunction with the gas-liquid separation function of the first accommodating chamber, so as to avoid liquid refrigerant directly entering the interior of the compression mechanism as much as possible, reduce the probability of liquid hammer, reduce the operating load of the electric compressor, and avoid internal wear caused by liquid hammer as much as possible. The return oil hole is arranged in this way to ensure the smoothness of the return lubricating oil, avoid the accumulation of lubricating oil, realize the lubrication of the internal parts of the compression mechanism, and further reduce wear. As a result, the operating noise and vibration of the electric compressor are reduced.

[0009] In some embodiments, there are at least two oil return holes including a first oil return hole and a second oil return hole, and the oil return inlet end of the first oil return hole is located below the oil return inlet end of the second oil return hole in the gravity direction.

[0010] Specifically, in the air flow direction in the air intake passage, the oil return outlet end of the first oil return hole is located downstream of the oil return outlet end of the second oil return hole.

[0011] In some embodiments, the air intake passage includes a first section and a second section, the first section is arranged to extend axially along the compression mechanism, one end of the first section is connected to the pump suction port, the second section is arranged vertically, the lower end of the second section is connected to the other end of the first section, and the upper end of the second section constitutes the air intake end.

[0012] Specifically, the oil return hole is located on a side of the second section away from the first section, and is connected to the second section.

[0013] Optionally, the oil return hole is arranged along the axial extension of the compression mechanism and is adjacent to the lower end of the second section.

[0014] In some embodiments, the air suction and liquid return structure is integrally formed on the bracket; or, the air suction and liquid return structure also includes a bracket suction pipe, the suction channel is formed on the bracket suction pipe, the bracket is provided with a mounting hole, and one end of the bracket suction pipe is assembled in the mounting hole.

[0015] In some specific embodiments, the air suction and liquid return structure includes the bracket air suction pipe, the oil return hole is formed on the pipe wall of the bracket air suction pipe, and the oil return hole is located on the pipe section of the bracket air suction pipe located outside the bracket.

[0016] In some embodiments, the diameter of the oil return hole ranges from 0.5 mm to 2 mm, and the height difference between the oil return inlet end and the bottom wall of the liquid storage chamber ranges from 2 mm to 10 mm.

[0017] Furthermore, the ratio of the aperture of the air intake passage to the aperture of the single oil return hole is in the range of 3-10.

[0018] In some specific embodiments, the compression mechanism is a rotary compression mechanism or a scroll compression mechanism.

[0019] An air conditioning system according to a second aspect of the present invention comprises an electric compressor according to any one embodiment of the first aspect of the present invention.

[0020] According to the air conditioning system of the present invention, by providing the electric compressor of the first aspect, the liquid hammer of the electric compressor can be reduced, thereby reducing the operating noise and vibration, and reducing the operating noise and vibration of the entire air conditioning system.

[0021] A vehicle according to a third aspect of the present invention includes: a vehicle body and an air conditioning system mounted on the vehicle body, wherein the air conditioning system is the air conditioning system according to the second aspect of the present invention.

[0022] According to the vehicle of the present invention, by setting the air-conditioning system of the second aspect mentioned above, noise and vibration can be reduced by reducing liquid hammer, reducing the resonance problems of various components in the vehicle thermal management system caused thereby, and improving the noise and vibration caused to the vehicle.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural schematic diagram partially showing the internal structure of an electric compressor in some embodiments of the present invention;

[0025] Figure 2 is a cross-sectional view of a support and a compression mechanism of some embodiments of the present invention;

[0026] Figure 3 are cross-sectional views of brackets and compression mechanisms of other embodiments of the present invention;

[0027] Figure 4 yes Figure 2 A side view of the bracket in the illustrated embodiment;

[0028] Figure 5 yes Figure 2 A cross-sectional view of the bracket in the illustrated embodiment;

[0029] Figure 6 is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] Electric compressor 100;

[0032] Shell assembly 1;

[0033] Inner cavity 10, refrigerant inlet 101;

[0034] A first housing 11;

[0035] A second housing 12;

[0036] Bracket 13, mounting hole 131;

[0037] The first accommodating chamber 14, the liquid storage chamber 141;

[0038] A second accommodating chamber 15;

[0039] Compression mechanism 2, pump suction port 201;

[0040] Drive shaft 4,

[0041] Air suction and liquid return structure 5;

[0042] Intake channel 51, intake end 511, first section 513, second section 514;

[0043] Oil return hole 52, oil return inlet end 521, oil return outlet end 522, first oil return hole 52A, second oil return hole 52B;

[0044] Bracket suction pipe 53;

[0045] Air conditioning system 200;

[0046] Vehicle 300. DETAILED DESCRIPTION

[0047] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it is necessary to understand that the terms "center", "up", "vertical", "lateral", "horizontal", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] Hereinafter, a motor-driven compressor 100 , an air-conditioning system 200 , and a vehicle 300 according to embodiments of the present invention will be described with reference to the accompanying drawings.

[0051] like Figure 1-Figure 3 As shown, the electric compressor 100 according to the embodiment of the present invention includes: a housing assembly 1 and a compression mechanism 2, and the compression mechanism 2 is used to compress low-pressure refrigerant to form high-pressure refrigerant.

[0052] The housing assembly 1 includes a first housing 11 and a bracket 13, and a first accommodating cavity 14 is defined between the first housing 11 and the bracket 13. Specifically, the housing assembly 1 also includes a second housing 12, and a second accommodating cavity 15 is defined between the second housing 12 and the bracket 13. More specifically, an inner cavity 10 is formed between the first housing 11 and the second housing 12, and the inner cavity 10 includes the first accommodating cavity 14 and the second accommodating cavity 15.

[0053] Specifically, Figure 1 As shown, the first shell 11 is provided with a refrigerant inlet 101 connected to the first accommodating chamber 14, and the bottom of the first accommodating chamber 14 constitutes a liquid storage chamber 141. The compression mechanism 2 is arranged between the bracket 13 and the second shell 12, that is, the compression mechanism 2 is arranged in the second accommodating chamber 15, and the compression mechanism 2 is provided with a pump suction port 201.

[0054] There is no limitation on the structural form of the housing assembly 1. In some examples, Figure 1 As shown, the first shell 11, the second shell 12 and the bracket 13 are all independently processed parts, and the first shell 11 and the second shell 12 are connected to opposite sides of the bracket 13. In other examples, the bracket 13 is an independently processed part and is placed in the inner cavity 10 as a whole, and the bracket 13 is connected to the first shell 11 or the second shell 12. In some other examples, the bracket 13 is integrally formed on the first shell 11, and in this case, the first housing cavity 14 can also be defined between the first shell 11 and the bracket 13.

[0055] The setting of the bracket 13 is to facilitate assembly on the one hand, and to improve the overall structural rigidity of the shell assembly 1 on the other hand, and increase its anti-seismic, anti-bending and anti-torsion performance. In addition, in some schemes, the setting of the bracket 13 can also separate the first accommodating chamber 14 and the second accommodating chamber 15, so that the first accommodating chamber 14 and the second accommodating chamber 15 can complete their respective functions. For example, the first accommodating chamber 14 is used as a gas-liquid separation chamber, and the first accommodating chamber 14 is connected to the refrigerant inlet 101, so the pressure is relatively low. The second accommodating chamber 15 is connected to the refrigerant discharge port, and the second accommodating chamber 15 is used as a buffer chamber for discharging high-pressure gaseous refrigerant. The pressure of the second accommodating chamber 15 is higher than that of the first accommodating chamber 15, so the bracket 13 is required to separate the first accommodating chamber 14 and the second accommodating chamber 15. In other schemes of the present application, the first accommodating chamber 14 and the second accommodating chamber 15 can also be connected to each other, so that the entire inner cavity 10 can be used as a gas-liquid separation chamber.

[0056] It is understandable that when the system is running, the refrigerant will carry lubricating oil from the refrigerant inlet 101 into the first accommodating chamber 14. The first accommodating chamber 14 can also take into account the function of the liquid storage device, and the gas-liquid separation is realized in the first accommodating chamber 14. The liquid refrigerant can be deposited in the liquid storage chamber 141, while the gaseous refrigerant floats after separation and floats above the liquid storage chamber 141. When the compression mechanism 2 is running, the gaseous refrigerant in the first accommodating chamber 14 is sucked in through the pump suction port 201, compressed by work, and then discharged. Among them, the pump outlet of the compression mechanism 2 can be directly or through a conduit connected to the refrigerant discharge port of the shell assembly 1, so that the high-pressure gaseous refrigerant discharged by the compression mechanism 2 is directly or through a conduit to the refrigerant discharge port, and then discharged from the refrigerant discharge port. Or when the first accommodating chamber 14 is not connected to the second accommodating chamber 15, and the refrigerant discharge port of the shell assembly 1 is connected to the second accommodating chamber 15, the high-pressure gaseous refrigerant discharged by the compression mechanism 2 can be discharged into the second accommodating chamber 15, and then discharged from the refrigerant discharge port.

[0057] The electric compressor 100 forms a liquid storage chamber 141 in the first accommodating chamber 14 . When the liquid storage chamber 141 also serves as a liquid reservoir, the electric compressor 100 does not need to be provided with a separate liquid reservoir outside the housing assembly 1 .

[0058] like Figure 1-Figure 3 As shown, an air suction and liquid return structure 5 is provided on the bracket 13, and the air suction and liquid return structure 5 includes an air suction channel 51, one end of the air suction channel 51 is an air suction inlet 511, and the other end of the air suction channel 51 is connected to the pump suction port 201, and the air suction inlet 511 is connected to the first accommodating chamber 14, and the air suction inlet 511 is located above the liquid storage chamber 141 in the direction of gravity.

[0059] Specifically, in the present application, the electric compressor 100 can be a horizontal compressor, that is, the drive shaft 4 of the compression mechanism 2 is arranged in the horizontal direction. The electric compressor 100 can also be arranged at an angle, that is, the drive shaft 4 of the compression mechanism 2 is arranged at an angle relative to the horizontal plane. Even the electric compressor 100 can be a vertical compressor, that is, the drive shaft 4 of the compression mechanism 2 is arranged vertically. In each scheme, the air intake end 511 of the air intake channel 51 is located above the liquid storage chamber 141 in the direction of gravity.

[0060] The air intake passage 51 is configured in this way to cooperate with the gas-liquid separation function of the first accommodating chamber 14, thereby preventing the liquid refrigerant from directly entering the compression mechanism 2, reducing the probability of liquid hammer, reducing the operating load of the electric compressor 100, and avoiding internal wear caused by liquid hammer.

[0061] The air suction and liquid return structure 5 also includes an oil return hole 52, and the two ends of the oil return hole 52 are an oil return inlet end 521 and an oil return outlet end 522. The oil return inlet end 521 is connected to the liquid storage chamber 141, and the oil return outlet end 522 is connected to the air suction channel 51. Thus, the lubricating oil can flow into the compression mechanism 2 through the oil return hole 52, so as to achieve lubrication of the internal parts of the compression mechanism 2 and further reduce wear.

[0062] It is understandable that, in the liquid storage chamber 141, due to the different densities of the liquid refrigerant and the lubricating oil, the distribution heights of the liquid refrigerant and the lubricating oil in the liquid storage chamber 141 are usually different. By setting the oil return hole 52, the oil return inlet 521 can be set in advance at the layer where the lubricating oil is located, so as to minimize the liquid refrigerant from entering the oil return hole 52 and reduce the risk of liquid hammer. By setting the oil return outlet 522 of the oil return hole 52 to be connected to the air intake channel 51, the compression mechanism 2 forms a negative pressure in the air intake channel 51 and when inhaling air, the negative pressure can be used to inhale the lubricating oil, thereby ensuring the smoothness of the reflux of the lubricating oil and avoiding the accumulation of the lubricating oil.

[0063] By reducing the liquid hammer problem of the electric compressor 100, vibration and noise generated during operation can be reduced.

[0064] In some embodiments, Figure 2 and Figure 3 As shown, there are at least two oil return holes 52 including a first oil return hole 52A and a second oil return hole 52B. The oil return inlet end 521 of the first oil return hole 52A is located below the oil return inlet end 521 of the second oil return hole 52B in the gravity direction.

[0065] It is understandable that the total amount of lubricating oil in the system is substantially unchanged. When the lubricating oil reserve in the liquid storage chamber 141 is low, most of the lubricating oil may flow to the compression mechanism 2 and other locations, so the lubricating oil level in the liquid storage chamber 141 is low. The return oil inlet 521 of the first oil return hole 52A is set relatively low, which can ensure the basic oil return capacity of the air suction return structure 5, and can still return oil to the compression mechanism 2 even if the lubricating oil reserve in the liquid storage chamber 141 is relatively small. When the lubricating oil reserve in the liquid storage chamber 141 is relatively high, the lubricating oil flowing to the compression mechanism 2 and other locations may be insufficient. At this time, the lubricating oil level in the liquid storage chamber 141 is relatively high, so that the first oil return hole 52A and the second oil return hole 52B can return oil, thereby increasing the amount of returned oil. Therefore, by setting the return oil inlet 521 of at least two oil return holes 52 at different heights along the gravity direction, it can be adapted to the required amount of lubricating oil of the compression mechanism 2, and realize self-regulation of the amount of returned oil.

[0066] In addition, the deeper the oil return inlet 521 is relative to the liquid surface in the liquid storage chamber 141, the greater the pressure and the stronger the reflux capacity. Therefore, by arranging the oil return inlet 521 of the first oil return hole 52A to be located below the oil return inlet 521 of the second oil return hole 52B in the gravity direction, the first oil return hole 52A, which is the basic oil return guarantee, can have a stronger reflux capacity, which is conducive to ensuring the continuity of reflux and reducing the probability of excessive wear caused by insufficient lubricating oil in the compression mechanism 2.

[0067] In order to meet the differentiated requirements of the return capacity of the oil return holes 52 at different positions, the flow areas of at least two oil return holes 52 can be set to be different, for example, the flow area of ​​the first oil return hole 52A is set to be larger than the flow area of ​​the second oil return hole 52B.

[0068] Optionally, there may be at least one first oil return hole 52A, and when there are at least two first oil return holes 52A, they are located at the same height.

[0069] Optionally, there may be at least one second oil return hole 52B, and when there are at least two second oil return holes 52B, they are located at the same height.

[0070] Of course, in order to further improve its return flow self-regulating ability, the oil return hole 52 can be set to have a greater height difference. And at each height, the number of the oil return hole 52 can be one or more. Even in the present application, only one oil return hole 52 can be set.

[0071] Specifically, Figure 2 and Figure 3As shown, in the air flow direction in the air intake passage 51, the oil return outlet 522 of the first oil return hole 52A is located downstream of the oil return outlet 522 of the second oil return hole 52B. It can be understood that in the air intake passage 51, the closer to the pump suction port 201 of the compression mechanism 2, the stronger the negative pressure, and the stronger the suction force of the gaseous refrigerant and lubricating oil being sucked away. Therefore, the oil return outlet 522 of the first oil return hole 52A is shorter than the oil return outlet 522 of the second oil return hole 52B from the pump suction port 201, which can make the first oil return hole 52A have a stronger oil return capacity than the second oil return hole 52B, and further ensure the basic oil return capacity of the oil return hole 52.

[0072] Of course, the solution of the present application is not limited thereto, and the oil return outlets 522 of the first oil return hole 52A and the second oil return hole 52B may be set to be equal to the path distance from the pump suction port 201 .

[0073] In some embodiments, Figure 2 and Figure 3 As shown, the air intake passage 51 includes a first section 513, which is arranged to extend along the axial direction of the compression mechanism 2, and one end of the first section 513 is connected to the pump suction port 201. The axial arrangement of the first section 513 allows the connection to be axially butted when connected to the pump suction port 201 of the compression mechanism 2, which is convenient for connection and not prone to air leakage. In addition, the pump suction port 201 of the compression mechanism 2 is usually arranged on the end face of the compression mechanism 2, so that the airflow flows more smoothly.

[0074] Specifically, the air intake passage 51 further includes a second section 514, the first section 513 is extended along the axial direction of the compression mechanism 2, the second section 514 is vertically arranged, the lower end of the second section 514 is connected to the other end of the first section 513, and the upper end of the second section 514 constitutes the air intake end 511. The arrangement of the second section 514 facilitates the first section 513 to be positioned lower while the air intake end 511 is high enough to inhale air. In this way, when setting the oil return hole 52, the oil return hole 52 can be set at a lower position, which reduces the length of the oil return path, reduces the oil return resistance, and also reduces the difficulty of setting the oil return hole 52.

[0075] The upper end of the air intake channel 51 and the upper end of the second section 514 mentioned herein all refer to the end located above them in the direction of gravity. The upper end of the air intake channel 51 and the upper end of the second section 514 mentioned herein all refer to the end located below them in the direction of gravity.

[0076] Specifically, the oil return hole 52 is configured so that the oil return outlet 522 is connected to the second section 514, which is convenient for processing on the one hand, and on the other hand, a distance is separated between the oil return hole 52 and the pump suction port 201. In this way, the gaseous refrigerant can have a certain time and space in the flow to mix with the refluxed lubricating oil. After sufficient mixing, it is beneficial for the lubricating oil to be distributed to various positions where the airflow can flow, which is beneficial for the uniform distribution of the lubricating oil inside the compression mechanism 2.

[0077] More specifically, the oil return outlet 522 is located at or near the lower end of the second section 514 so that it can be sucked into the compression mechanism 2 by a larger negative pressure suction force.

[0078] In some specific embodiments, the oil return hole 52 is located on the side of the second section 514 away from the first section 513, and is connected to the second section 514. In this way, the length of the oil return hole 52 does not need to be set too long, and the oil return path can be further shortened, the oil return resistance can be reduced, and the oil return capacity can be guaranteed. In addition, the probability of the airflow in the air intake channel 51 blocking the oil return hole 52 when flowing downward is also reduced, thereby improving the fluidity of the oil return.

[0079] Alternatively, if Figure 2-Figure 3 As shown, the oil return hole 52 is arranged to extend along the axial direction of the compression mechanism 2 and is adjacent to the lower end of the second section 514. Therefore, the oil return hole 52 can guide the lubricating oil along the axial direction of the compression mechanism 2 to the suction channel 51, which is basically consistent with the flow direction of the airflow after entering the first section 513, which is conducive to reducing flow loss and reducing airflow disturbance in the suction channel 51.

[0080] Of course, the solution of the present application may not be limited thereto, for example, the oil return hole 52 may be disposed at the bottom of the first section 513 and communicated with the first section 513 . Alternatively, there may be multiple oil return holes 52 , which may be distributed around the first section 513 .

[0081] In the present application, the structural setting of the air suction and liquid return structure 5 is relatively flexible.

[0082] In some embodiments, Figure 2 and Figure 4 , Figure 6 , the air intake and liquid return structure 5 is integrally formed on the bracket 13. That is to say, the air intake channel 51 and the oil return hole 52 can be directly formed on the bracket 13, which can reduce the number of parts and facilitate the control of the axial size of the electric compressor 100. In addition, after the air intake channel 51 and the oil return hole 52 can be directly formed on the bracket 13, since the position and angle of the bracket 13 are fixed, the air intake channel 51 and the oil return hole 52 cannot shake relative to the bracket 13, so the air intake position and the oil return position can be guaranteed, and the working reliability is high.

[0083] In other embodiments, Figure 3As shown, the air suction and liquid return structure 5 also includes a bracket air suction pipe 53, an air suction channel 51 is formed on the bracket air suction pipe 53, a mounting hole 131 is provided on the bracket 13, and one end of the bracket air suction pipe 53 is assembled in the mounting hole 131. By setting the bracket air suction pipe 53, the shape of the air suction channel 51 is less restricted by the shape and assembly relationship of the bracket 13 itself, and the air suction inlet end 511 of the air suction channel 51 can be set to be high enough to further avoid the probability of liquid refrigerant flowing in. Moreover, the bracket air suction pipe 53 can be used to conveniently process the required shape of the air suction channel 51, and the bracket 13 itself does not need to be too thick, which is conducive to controlling its weight.

[0084] Specifically, when the air suction and liquid return structure 5 includes a bracket air suction pipe 53 , the oil return hole 52 is formed on the tube wall of the bracket air suction pipe 53 , and may also be directly provided on the bracket 13 .

[0085] In some specific embodiments, Figure 3 As shown, the air suction and liquid return structure 5 includes a bracket air suction pipe 53, and the oil return hole 52 is formed on the pipe wall of the bracket air suction pipe 53, and the oil return hole 52 is located on the pipe section of the bracket air suction pipe 53 located outside the bracket 13. In this way, it is easier to punch holes in the pipe. In particular, according to the shape of the bracket air suction pipe 53, the height range of the oil return hole 52 can be selected to be wider.

[0086] Optionally, on the bracket suction pipe 53, the lower end of the second section 514 forms a curved section and is connected to the first section 513. The oil return hole 52 is located on the curved section at the lower end of the second section 514. In this way, when the airflow flows and turns, it is easier to fully mix with the lubricating oil.

[0087] In some embodiments, Figure 2 and Figure 3 As shown, the diameter d1 of the oil return hole 52 is in the range of 0.5mm-2mm, so that the return amount of the lubricating oil flowing from a single oil return hole 52 can be controlled within a reasonable range. On the one hand, the diameter of the oil return hole 52 will not be too small to prevent the oil return hole 52 from being blocked by impurities and ensure the continuity of the lubricating oil supply flow. On the other hand, the diameter of the oil return hole 52 will not be too large to prevent the lubricating oil in the liquid storage chamber 141 from flowing too fast. In particular, when there are at least two oil return holes 52, not only is it necessary to control the aperture d1 of the oil return hole 52 within the range of 0.5mm-2mm, but also there is a height difference of at least 2mm between the oil return inlet ends 521 of every two oil return holes 52. In this way, when the amount of oil stored in the liquid storage chamber 141 is small, only a small number of oil return holes 52 return oil, while when the amount of oil stored in the liquid storage chamber 141 is large, multiple oil return holes 52 can return oil. Moreover, due to the aperture limitation of each oil return hole 52, even if multiple oil return holes 52 supply oil at the same time, there is still enough buffer time for the lubricating oil to flow back to the liquid storage chamber 141 from the compression mechanism 2 or the external system. This also ensures the continuity of the lubricating oil supply flow from another aspect.

[0088] Moreover, since the flow rate of the lubricating oil flowing into the single oil return hole 52 is small after being limited by the aperture, the lubricating oil can be quickly dispersed and evenly mixed by the air flow after flowing into the air intake passage 51, so that the oil is quickly dispersed into oil mist, which is beneficial to increase the distribution area of ​​the oil mist when it enters the compression mechanism 2 and adheres to the surface of the moving parts. Therefore, limiting the aperture d1 of the oil return hole 52 to a range of 0.5mm-2mm can effectively reduce the possibility of lubricating oil being retained and accumulated in the air intake passage 51.

[0089] Specifically, Figure 1 As shown, along the gravity direction, the height difference H1 between the lowest return oil inlet 521 and the bottom wall of the liquid storage chamber 141 ranges from 2mm to 10mm. By setting the return oil inlet 521 to be at least 2mm higher than the bottom wall of the liquid storage chamber 141, the probability of impurities sinking to the bottom of the liquid storage chamber 141 clogging the return oil hole 52 can be reduced. By setting the return oil inlet 521 to have a height difference H1 of no more than 10mm with the bottom wall of the liquid storage chamber 141, the probability of liquid refrigerant entering the return oil hole 52 can be reduced, which is conducive to ensuring that the lubricating oil supply in the liquid storage chamber 141 is sufficient.

[0090] Moreover, when the return oil inlet 521 of the lowest return oil hole 52 is within this height range, the hydraulic pressure of the lubricating oil is higher than the refrigerant pressure in the first accommodating chamber 14, and when the suction at the pump suction port 201 forms a negative pressure, a sufficiently large pressure difference is formed between the return oil inlet 521 and the pump suction port 201, especially when the aperture d1 of the single return oil hole 52 is limited to between 0.5mm and 2mm, it is beneficial for the lubricating oil to be injected into the suction channel 51 at the return oil outlet 522. The spray-shaped lubricating oil has a large oil mist distribution, and is easier to be fully and evenly mixed with the gaseous refrigerant flowing through.

[0091] Furthermore, while satisfying the above parameters, if Figure 2 As shown, when there are at least two oil return holes 52, the distance H2 between the oil return outlets 522 of two adjacent oil return holes 52 is at least 2 mm. In this way, when the lubricating oil in each oil return hole 52 is sprayed into the air intake passage 51 under the action of the pressure difference and forms a mist surface, the mist surfaces initially formed by the two oil return holes 52 do not intersect. In this way, the mist-like lubricating oil is fully mixed and dispersed when the gaseous refrigerant flows through, further reducing the probability of the lubricating oil being retained in the air intake passage 51.

[0092] In some embodiments, Figure 2 and Figure 3 As shown, the ratio of the aperture d2 of the air intake passage 51 to the aperture d1 of the single oil return hole 52 is in the range of 3-10. In this way, the mixing ratio of the gaseous refrigerant and the lubricating oil is controlled within a reasonable range, especially when the gaseous refrigerant flows through the oil return hole 52, the lubricating oil can be easily taken away, further reducing the probability of the lubricating oil being retained and accumulated in the air intake passage 51.

[0093] In the present application, the type of the compression mechanism 2 is not limited, for example, it can be a rotary compression mechanism or a scroll compression mechanism.

[0094] Thus, different types of compression mechanisms 2 can be used on different electric compressors 100. For example, when the electric compressor 100 is a rotary compressor, the compression mechanism 2 is a rotary compression mechanism, and the compression mechanism 2 may include a cylinder, a piston, a vane, etc. The drive shaft 4 of the compression mechanism 2 drives the piston to roll in the cylinder. When the electric compressor 100 is a scroll compressor, the compression mechanism 2 is a scroll compression mechanism, and the compression mechanism 2 may include a fixed scroll and a movable scroll, and the drive shaft 4 drives the movable scroll to rotate, etc.

[0095] It should be noted that the specific type of the electric compressor 100 is not limited. When the compression mechanism 2 is a rotary compression mechanism, it can be a single-cylinder compression mechanism or a multi-cylinder compression mechanism.

[0096] The air conditioning system 200 according to the embodiment of the present invention comprises the electric compressor 100 of any one of the above embodiments. Thus, by adopting the above electric compressor 100, the liquid hammer problem of the electric compressor 100 is reduced, and the use of the liquid accumulator can be reduced, which is conducive to reducing the volume of the air conditioning system 200. At the same time, the operating noise and vibration of the electric compressor 100 can be reduced, thereby reducing the overall working noise and vibration of the air conditioning system 200.

[0097] It should be noted that the specific application scenarios of the air-conditioning system 200 according to the embodiment of the present invention are not limited, such as indoor air conditioning, indoor refrigerator, vehicle air conditioning, etc. When the application scenario is determined, technical personnel in this field can know other components of the air-conditioning system 200. For example, when used for indoor air conditioning or indoor refrigerator, it can also include an evaporator, a condenser, a throttling element, etc. For example, when used for a vehicle air conditioner, it can also include an in-vehicle condenser, an in-vehicle evaporator, an outdoor condenser, an outdoor evaporator, at least one of the throttling components, etc., which will not be repeated here.

[0098] like Figure 6 As shown, a vehicle 300 according to an embodiment of the present invention comprises: a vehicle body and an air conditioning system 200 mounted on the vehicle body, wherein the air conditioning system 200 is the air conditioning system 200 of any of the above embodiments. Since the hydraulic shock of the electric compressor 100 included in the air conditioning system 200 of any of the above embodiments can be improved, when the air conditioning system 200 is used in the vehicle 300, the operating noise and vibration of the electric compressor 100 can be improved, and the resonance problem of each component in the thermal management system of the vehicle 300 can be improved, thereby improving the noise and vibration caused to the vehicle 300.

[0099] In addition, since the use of the electric compressor 100 described above can reduce the volume of the air conditioning system 200, the installation position of the air conditioning system 200 in the vehicle 300 is more flexible.

[0100] It should be noted that the specific type of the vehicle 300 according to the embodiment of the present invention is not limited, for example, it can be a new energy vehicle, and the new energy vehicle can include a pure electric vehicle, a hybrid vehicle, etc., which will be described in detail here. In addition, when the type of the vehicle 300 is specifically determined, those skilled in the art can know other components of the vehicle 300, which will not be described in detail here.

[0101] The electric compressor 100 according to some specific embodiments of the present invention is described below.

[0102] First embodiment

[0103] like Figure 1-Figure 2 As shown, the exemplary electric compressor 100 is a rotary electric compressor, comprising a housing assembly 1 and a compression mechanism 2. The compression mechanism 2 is used to compress and convert a low-pressure refrigerant into a high-pressure refrigerant.

[0104] The housing assembly 1 includes a first housing 11, a second housing 12 and a bracket 13. The first housing 11 and the second housing 12 are connected to opposite sides of the bracket 13. A first accommodating chamber 14 is formed between the first housing 11 and the bracket 13. A second accommodating chamber 15 is formed between the bracket 13 and the second housing 12. The compression mechanism 2 is disposed in the second accommodating chamber 15 and is fixedly connected to the bracket 13.

[0105] The compression mechanism 2 is a double-cylinder compression mechanism, including: a first bearing, a second bearing, a first cylinder, a second cylinder, a first piston, a second piston, and a partition. The first cylinder and the second cylinder are spaced apart in the axial direction, and the first cylinder is located on the side of the second cylinder close to the bracket, the partition is sandwiched between the first cylinder and the second cylinder, the first bearing is located on the side of the first cylinder away from the partition, and the second bearing is located on the side of the second cylinder away from the partition.

[0106] A first compression chamber is formed between the first cylinder, the partition and the first bearing, and the first piston is rollably disposed in the first compression chamber. A second compression chamber is formed between the second cylinder, the partition and the second bearing, and the second piston is rollably disposed in the second compression chamber. A pump suction port 201 is provided on the compression mechanism 2, and the pump suction port 201 is connected to at least one of the first compression chamber and the second compression chamber.

[0107] The bracket 13 is provided with an air suction and liquid return structure 5, which is integrally formed on the bracket 13, that is, an air suction channel 51 and an oil return hole 52 are formed on the bracket 13. The air suction channel 51 is L-shaped, and one end is connected to the pump suction port 201, and the oil return hole 52 is connected to the air suction channel 51.

[0108] The bottom of the first accommodating chamber 14 forms a liquid storage chamber 141. The upper end of the air intake channel 51 is an air intake end 511, which is connected to the first accommodating chamber 14 and is located above the liquid storage chamber 141. There are at least two oil return holes 52, including a first oil return hole 52A and a second oil return hole 52B, which have different heights and are both connected to the liquid storage chamber 141.

[0109] Second embodiment

[0110] like Figure 3 As shown, the second embodiment is basically the same as the first embodiment, except that the air suction and liquid return structure 5 also includes a bracket air suction pipe 53, the air suction channel 51 is formed on the bracket air suction pipe 53, and the bracket 13 is provided with a mounting hole 131, and one end of the bracket air suction pipe 53 is assembled in the mounting hole 131.

[0111] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric compressor, characterized in that: include: A shell assembly, the shell assembly comprising a first shell and a bracket, a first accommodating chamber is defined between the first shell and the bracket, a refrigerant inlet communicating with the first accommodating chamber is provided on the first shell, and the bottom of the first accommodating chamber constitutes a liquid storage chamber; A compression mechanism, the compression mechanism is connected to the bracket and is provided with a pump suction port; Among them, the bracket is provided with an air suction and liquid return structure, which includes an air suction channel and an oil return hole, one end of the air suction channel is an air suction inlet, and the other end of the air suction channel is connected to the pump suction port, the air suction inlet is connected to the first accommodating cavity, and the air suction inlet is located above the liquid storage cavity in the gravity direction, the two ends of the oil return hole are an oil return inlet and an oil return outlet, the oil return inlet is connected to the liquid storage cavity, and the oil return outlet is connected to the air suction channel.

2. The electric compressor according to claim 1, characterized in that There are at least two oil return holes including a first oil return hole and a second oil return hole. The oil return inlet end of the first oil return hole is located below the oil return inlet end of the second oil return hole in the gravity direction.

3. The electric compressor according to claim 2, characterized in that: In the air flow direction in the air intake passage, the oil return outlet end of the first oil return hole is located downstream of the oil return outlet end of the second oil return hole.

4. The electric compressor according to claim 1, characterized in that The air intake passage includes a first section and a second section, the first section is extended along the axial direction of the compression mechanism, one end of the first section is connected to the pump suction port, the second section is vertically arranged, the lower end of the second section is connected to the other end of the first section, and the upper end of the second section constitutes the air intake end.

5. The electric compressor according to claim 4, characterized in that The oil return hole is located at a side of the second section away from the first section and is connected to the second section.

6. The electric compressor according to claim 4, characterized in that The oil return hole is extended along the axial direction of the compression mechanism and is adjacent to the lower end of the second section.

7. The electric compressor according to claim 1, characterized in that The air suction and liquid return structure is integrally formed on the bracket; Alternatively, the air suction and liquid return structure further comprises a bracket air suction pipe, the air suction channel is formed on the bracket air suction pipe, the bracket is provided with a mounting hole, and one end of the bracket air suction pipe is assembled in the mounting hole.

8. The electric compressor according to claim 7, characterized in that The air suction and liquid return structure comprises the support air suction pipe, the oil return hole is formed on the pipe wall of the support air suction pipe, and the oil return hole is located on the pipe section of the support air suction pipe located outside the support.

9. The electric compressor according to any one of claims 1 to 8, characterized in that: The diameter of the oil return hole is in the range of 0.5 mm to 2 mm, and the height difference between the oil return inlet end and the bottom wall of the liquid storage cavity is in the range of 2 mm to 10 mm.

10. The electric compressor according to any one of claims 1 to 8, characterized in that: The ratio of the aperture of the air intake passage to the aperture of the single oil return hole is in the range of 3-10.

11. The electric compressor according to any one of claims 1 to 8, characterized in that: The compression mechanism is a rotary compression mechanism or a scroll compression mechanism.

12. An air conditioning system, characterized in that: The invention comprises the electric compressor according to any one of claims 1 to 11.

13. A vehicle, characterized in that: include: A vehicle body and an air conditioning system mounted on the vehicle body, wherein the air conditioning system is the air conditioning system according to claim 12.

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