Cooling structure, motor, air compressor, fuel cell engine and vehicle

Abstract

The invention provides a cooling structure, a motor, an air compressor, a fuel cell engine and a vehicle, the cooling structure comprises a motor shell, the motor shell is provided with a first liquid guide channel, a first liquid inlet and a first liquid outlet, the first liquid inlet and the first liquid outlet are communicated with the first liquid guide channel, the first liquid inlet is used for guiding in a cooling medium, and the first liquid outlet is used for guiding out the cooling medium; the end cover comprises a connecting part and a mounting part, two axial ends of the mounting part penetrate through the connecting part, the connecting part is connected with the motor shell, one axial end of the mounting part is connected with the connecting part, and the connecting part is provided with a second liquid guide channel; the bearing support is nested in the space defined by the mounting part, a cooling cavity is defined between the bearing support and the inner wall of the mounting part, and the cooling cavity communicates with the second liquid guide channel; and the air bearing is assembled on the bearing support. The cooling structure can reduce the influence of heat generation and poor heat dissipation of the air bearing on the performance of the air compressor, so that the efficiency and the service life of the air compressor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and mainly relates to a cooling structure, a motor, an air compressor, a fuel cell engine, and a vehicle. Background Art

[0002] The air compressor is one of the main technical means to improve the system power density and efficiency of the fuel cell engine. The air compressor for fuel cells has high requirements for cleanliness. Grease will cause poisoning of the stack system and performance degradation. Therefore, only air bearings without lubricating grease can be used. Therefore, the operating environment of the air bearing is relatively harsh, and heat will be generated during the operation, posing a huge challenge to the heat dissipation requirements inside the air compressor. Summary of the Invention

[0003] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a cooling structure, a motor, an air compressor, a fuel cell engine, and a vehicle to effectively dissipate heat inside the air compressor.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A technical solution of one aspect of the present invention provides a cooling structure, including:

[0006] A motor housing, the motor housing is provided with a first liquid guiding channel, and a first liquid inlet and a first liquid outlet communicating with the first liquid guiding channel. The first liquid inlet is used for introducing a cooling medium, and the first liquid outlet is used for discharging the cooling medium;

[0007] An end cover, the end cover includes a connecting portion and an installation portion axially penetrating through both ends. The connecting portion is connected to the motor housing. One axial end of the installation portion is connected to the connecting portion, and the connecting portion is provided with a second liquid guiding channel;

[0008] A bearing support, the bearing support is nested in the space surrounded by the installation portion. A cooling cavity is formed between the bearing support and the inner wall of the installation portion, and the cooling cavity communicates with the second liquid guiding channel;

[0009] An air bearing, the air bearing is assembled on the bearing support.

[0010] According to some technical solutions of the present invention, the connecting portion includes an annular plate. The inner surface of the annular plate is connected to the outer surface of one axial end of the installation portion. The second liquid guiding channel includes a first through hole radially distributed along the annular plate. The first through hole penetrates the inner surface and the outer surface of the annular plate, and the first through hole communicates with the cooling cavity.

[0011] According to some technical solutions of the present invention, the connecting portion further includes an annular rib. The annular plate has two opposite plate surfaces, one of the plate surfaces faces the motor housing, the annular rib is located on the plate surface of the annular plate facing the motor housing, the annular rib protrudes relative to the plate surface, and a plurality of second through holes are spaced apart on the annular rib. The second through holes communicate the first liquid guiding channel with the first through hole.

[0012] According to some technical solutions of the present invention, a seal is further included. The seal is located at the first through hole on the outer surface of the annular plate to prevent the cooling medium in the second liquid guiding channel from flowing out through the outer surface of the annular plate.

[0013] According to some technical solutions of the present invention, the seal is a steel ball, and the steel ball is embedded in the first through hole to block the opening of the first through hole on the outer surface of the annular plate.

[0014] According to some technical solutions of the present invention, the motor housing includes a housing member and a liquid guiding sleeve. The housing member is provided with a through groove penetrating axially, the liquid guiding sleeve is disposed in the through groove, the first liquid guiding channel includes a liquid guiding groove, the liquid guiding groove communicates with the first liquid inlet, and the liquid guiding groove spirally extends axially along the outer surface of the liquid guiding sleeve.

[0015] According to some technical solutions of the present invention, the first liquid guiding channel further includes a liquid inlet groove and a liquid outlet groove. The outer surface of the liquid guiding sleeve is recessed to form the liquid inlet groove and the liquid outlet groove. The liquid inlet groove communicates the liquid guiding groove with the second liquid guiding channel, and the liquid outlet groove communicates the second liquid guiding channel with the liquid outlet, so that the cooling medium in the second liquid guiding channel can flow to the liquid outlet through the liquid outlet groove.

[0016] According to some technical solutions of the present invention, the motor housing further includes a partition rib. The partition rib is protrudingly disposed relative to the outer surface of the liquid guiding sleeve, and the partition ribs are symmetrically disposed on the liquid guiding sleeve to divide the outer surface of the liquid guiding sleeve to form the liquid inlet groove and the liquid outlet groove.

[0017] According to some technical solutions of the present invention, a plurality of second through holes are spaced apart on the connecting portion of the end cover. The second through holes include a second liquid inlet and a second liquid outlet. The second liquid inlet communicates with the liquid inlet groove, the second liquid outlet communicates with the liquid outlet groove, and the number of the second liquid inlets is the same as that of the second liquid outlets.

[0018] According to some technical solutions of the present invention, one of the outer surface of the air bearing and the inner surface of the bearing support is provided with a limiting rib, and the other of the outer surface of the air bearing and the inner surface of the bearing support is provided with a limiting groove. The limiting rib is clamped in the limiting groove so that the air bearing and the bearing support are connected to each other.

[0019] According to some technical solutions of the present invention, the two axial ends of the bearing support are respectively in interference fit with the end covers, and the bearing support is hermetically connected to the end covers to prevent the cooling medium in the cooling cavity from leaking from the connection between the bearing support and the end covers.

[0020] The technical solutions in the second aspect of the present invention propose a motor, including a motor stator, a motor rotor, and the cooling structure as described in the above embodiments. A cavity is formed by enclosing the motor housing and the end covers, and the motor stator and the motor rotor are installed in the cavity.

[0021] According to some technical solutions of the present invention, the motor stator is in interference fit with the inner wall surface of the motor housing.

[0022] According to some technical solutions of the present invention, at least a part of the other axial end of the mounting portion of the end cover extends to the inside of the motor stator.

[0023] The technical solutions in the third aspect of the present invention propose an air compressor, including the motor as described in the above embodiments and a compressor driven by the motor.

[0024] The technical solutions in the fourth aspect of the present invention propose a fuel cell engine, including a battery reactor, a hydrogen supply system, and an air supply system. The air supply system includes the air compressor as described in the above embodiments.

[0025] The technical solutions in the fifth aspect of the present invention propose a vehicle, including a vehicle body and a fuel cell engine provided on the vehicle body. The fuel cell engine is the fuel cell engine as described in the above embodiments.

[0026] Compared with the prior art, the present application has at least the following advantages:

[0027] In this application, a first liquid guiding channel, a first liquid inlet and a first liquid outlet communicating with the first liquid guiding channel are provided on the motor housing, so that the cooling medium can flow into the motor housing to dissipate heat from heating elements such as the stator in the motor housing, and the cooling medium that takes away the heat flows out of the motor housing through the first liquid outlet, thereby efficiently cooling the motor stator; the end cover includes a connecting portion and a mounting portion axially penetrating through both ends, wherein the connecting portion of the end cover is connected to the motor housing, and the mounting portion is connected to the connecting portion and is used for installing a bearing support, and an air bearing is installed in the bearing support. A cooling cavity is formed between the mounting portion and the bearing support. In this way, the first liquid guiding channel can flow to the cooling cavity, and the cooling medium flowing through the cooling cavity can directly take away the heat on the surface of the bearing support, thereby effectively dissipating the heat generated by the air bearing and realizing effective cooling of the air bearing, so that the cooling structure can reduce the influence of heat generation and poor heat dissipation of the air bearing on the performance of the air compressor, thereby improving its efficiency and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other objects, features and advantages of the present application will become more apparent.

[0029] Figure 1 It is a sectional view of a motor according to an embodiment of the present application;

[0030] Figure 2 It is a schematic diagram of a housing part according to an embodiment of the present application;

[0031] Figure 3 It is a schematic diagram of a heat conduction sleeve according to an embodiment of the present application;

[0032] Figure 4 It is a three-dimensional schematic diagram of an end cover according to an embodiment of the present application;

[0033] Figure 5 It is one of the sectional views of an end cover according to an embodiment of the present application;

[0034] Figure 6 It is the second sectional view of an end cover according to an embodiment of the present application;

[0035] Figure 7 It is a schematic diagram of an air bearing according to an embodiment of the present application;

[0036] Figure 8 It is a schematic diagram of a bearing support according to an embodiment of the present application.

[0037] Among them, the corresponding relationship between the reference numerals and the component names is as follows:

[0038] 1 Motor housing, 101 First liquid guide channel, 1011 Liquid guide groove, 1012 Liquid inlet groove, 1013 Liquid outlet groove, 102 First liquid inlet, 103 First liquid outlet, 11 Housing part, 12 Liquid guide sleeve, 13 Partition rib;

[0039] 2 End cover, 201 Second liquid guide channel, 2011 First through hole, 2012 Second through hole, 21 Connecting part, 211 Ring-shaped plate, 212 Ring-shaped rib, 22 Mounting part;

[0040] 3 Bearing support, 301 Cooling cavity, 302 Limiting groove;

[0041] 4 Air bearing;

[0042] 5 Seal;

[0043] 6 Limiting rib;

[0044] 7 Motor stator, 71 Stator core, 72 Stator winding;

[0045] 8 Motor rotor. Detailed implementation mode

[0046] Although the present application can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as a demonstration of the principle of the present application and is not intended to limit the present application to what is described herein.

[0047] Therefore, a feature pointed out in this specification will be used to illustrate one of the features of an embodiment of the present application, rather than implying that each embodiment of the present application must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined to show a possible system design, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.

[0048] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 of the present invention.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The present application provides a cooling structure, a motor, an air compressor, a fuel cell engine, and a vehicle, which effectively dissipate heat inside the air compressor.

[0051] The following further elaborates on the preferred embodiments of the present application in conjunction with the drawings of this specification.

[0052] Please refer to the attached Figures 1 to 8 , an embodiment of one aspect of the present application provides a cooling structure, including a motor housing 1, an end cover 2, a bearing support 3, and an air bearing 4.

[0053] The motor housing 1 is provided with a first liquid guiding channel 101 for introducing and discharging a cooling medium. Among them, the motor housing 1 is provided with a first liquid inlet 102 communicating with the first liquid guiding channel 101, and the first liquid inlet 102 is used for introducing the cooling medium into the cooling structure. The motor housing 1 is also provided with a first liquid outlet 103 communicating with the first liquid guiding channel 101, and the first liquid outlet 103 is used for discharging the cooling medium that has flowed through the first liquid guiding channel 101, the second liquid guiding channel 201, and the cooling chamber 301 for heat exchange. This cooling medium can directly use cold water or a coolant with good heat absorption effect.

[0054] As Figure 4 shown, the end cover 2 includes a connecting portion 21 and an installation portion 22 that penetrates through both axial ends. The connecting portion 21 is connected to the motor housing 1, and one axial end of the installation portion 22 is connected to the connecting portion 21. The connecting portion 21 is provided with a second liquid guiding channel 201. Among them, the connection between the connecting portion 21 and the motor housing 1 can be achieved by welding or other fixing methods. The design of the installation portion that penetrates through both axial ends of the end cover can also guide the cooling medium to the outside of the bearing support, thereby forming a structure specifically for water-cooling the air bearing and better cooling the air bearing.

[0055] The bearing support 3 is nested in the space enclosed by the installation part 22. A cooling cavity 301 is formed between the bearing support 3 and the inner wall of the installation part 22. The cooling cavity 301 is communicated with the second liquid guiding channel 201. In this way, the gap between the bearing support 3 and the installation part 22 forms a circulation space for the coolant, that is, the above-mentioned cooling cavity 301. The cooling cavity 301 is communicated with the second liquid guiding channel 201, so that the cooling medium can flow through the space between the bearing support 3 and the installation part 22. Further, the air bearing 4 is assembled on the bearing support 3. Since the air bearing 4 rotates at a high speed, a large amount of heat will be generated. Therefore, the coolant flowing through the cooling cavity 301 can absorb the heat generated by the air bearing 4 and take it away, realizing effective cooling of the air bearing. Specifically, in order to be suitable for the installation of the air bearing and the bearing support, the installation part 22 is designed as an annular body to make the cooling structure more compact.

[0056] As Figure 4 shown, in some embodiments, the connecting part 21 includes an annular plate 211. The inner surface of the annular plate 211 is connected to the outer surface of one axial end of the installation part 22. The second liquid guiding channel 201 includes a first through hole 2011 radially distributed along the annular plate 211. The first through hole 2011 penetrates the inner surface and the outer surface of the annular plate 211, and the first through hole 2011 is communicated with the cooling cavity 301. In this way, the cooling medium can flow to the cooling cavity 301 along the first through hole 2011 penetrating the annular plate 211, which is beneficial to the more uniform distribution of the cooling medium in the cooling cavity 301, thereby improving the cooling effect on the air bearing and ensuring its stable operation.

[0057] More specifically, for example, as Figure 5 shown, the number of the first through holes 2011 is multiple, so that the cooling medium can enter the cooling cavity 301 from multiple points. The multiple first through holes 2011 can form multiple coolant flows in the cooling cavity 301. These liquid flows are more evenly distributed in the cooling cavity 301, which helps to improve the cooling efficiency and ensure the stable operation of the air bearing.

[0058] In some embodiments, the connecting portion 21 further includes an annular rib 212. The annular plate 211 has two opposite plate surfaces, one of which faces the motor housing 1. The annular rib 212 is located on the plate surface of the annular plate 211 facing the motor housing 1. The annular rib 212 protrudes relative to the plate surface. The annular rib 212 is provided with a plurality of second through holes 2012 at intervals. The second through holes 2012 communicate the first liquid guiding channel 101 with the first through hole 2011. By providing the annular rib 212 on the plate surface facing the motor housing 1, and the annular rib 212 is provided with a plurality of second through holes 2012 at intervals, and the second through holes 2012 communicate the first liquid guiding channel 101 with the first through hole 2011, this is conducive to allowing the cooling medium to enter the end cover and flow through a longer flow path. Moreover, a plurality of first through holes 2011 and second through holes 2012 are arranged correspondingly. A longer cooling medium flow path means that the cooling medium is more evenly distributed in the cooling cavity 301, so as to better control the temperature of the air bearing, reduce failures caused by overheating and thermal stress, and thus improve the reliability and stability of the air compressor.

[0059] As Figure 5 shown, more specifically, the second through holes 2012 provided on the annular rib 212 are arranged at equal intervals. Correspondingly, the first through holes 2011 provided on the annular plate 211 are also arranged at equal intervals, so that the cooling medium can be evenly distributed on the outer peripheral side of the air bearing, achieving a better heat dissipation effect.

[0060] In some embodiments, a seal 5 is further included. The seal 5 is located at the first through hole 2011 on the outer surface of the annular plate 211 to prevent the cooling medium in the second liquid guiding channel 201 from flowing out through the outer surface of the annular plate 211. In this way, by adding an additional seal 5, it is possible to effectively prevent the cooling medium from flowing out through the outer surface of the annular plate 211, ensuring that more cooling medium can enter the first through hole 2011. In addition, the seal 5 can also prevent external impurities and moisture from entering the cooling structure, thereby maintaining the purity of the cooling medium, protecting the cooling structure from damage, and helping to extend the service life of the air compressor.

[0061] In some specific embodiments, the seal can be an O-ring. The O-ring abuts between the opening of the first through hole 2011 on the outer surface of the annular plate 211 and the motor housing to play a sealing role.

[0062] As Figure 1As shown, in some embodiments, the seal 5 is a steel ball, which is embedded in the first through hole 2011 to block the opening of the first through hole 2011 on the outer surface of the annular plate 211. The steel ball has good elasticity and wear resistance and can adapt to different cooling medium pressures and temperature changes. When the cooling medium flows through the first liquid guiding channel and the first through hole, the steel ball can closely adhere to the outer surface of the annular plate to prevent the cooling medium from flowing out from the outer surface of the annular plate. Using the steel ball as the seal 5 can provide a more reliable and adaptable sealing effect, which helps to ensure that the coolant completely flows through the preset path and improves the cooling efficiency of the air bearing and the protection effect on the internal components.

[0063] As Figure 2 and Figure 3 As shown, in some embodiments, the motor housing 1 includes a housing member 11 and a cooling guide sleeve 12. The housing member 11 is provided with a through groove axially penetrating therethrough, and the cooling guide sleeve 12 is inserted into the through groove. The first liquid guiding channel 101 includes a liquid guiding groove 1011, and the liquid guiding groove 1011 communicates with the first liquid inlet 102. The liquid guiding groove 1011 spirally extends axially along the outer surface of the cooling guide sleeve 12. On the one hand, the housing member 11 is provided with a through groove axially penetrating therethrough, and the cooling guide sleeve 12 is inserted into the through groove, enhancing the stability and cooling effect of the motor housing. On the other hand, the liquid guiding groove 1011 spirally extends axially along the outer surface of the cooling guide sleeve 12, so that the liquid guiding groove 1011 can more fully cover the surface of the motor housing. In this way, the cooling medium can flow annularly along the liquid guiding groove 1011 relative to the surface of the motor housing, thereby increasing the contact area between the cooling medium and the motor stator installed inside the motor housing. Moreover, the spirally extending liquid guiding groove 1011 increases the flow path of the cooling medium, allowing more cooling medium to be introduced per unit time, achieving efficient heat dissipation of the motor stator and improving the heat dissipation effect on the air bearing.

[0064] Specifically, the housing member 11 is in a circular ring shape, and the cooling guide sleeve 12 is in a circular ring shape.

[0065] More specifically, for example, the cooling guide sleeve includes a cylindrical body, the cylindrical body is inserted into the through groove, the cylindrical body abuts against the through groove, and a liquid guiding groove is recessed on the circumferential side surface of the cylindrical body. Or, the cooling guide sleeve includes a cylindrical body and a rib, the rib protrudes relative to the outer surface of the cylindrical body and spirally extends axially along the cylindrical body, and the rib and the surface of the housing member enclose a liquid guiding groove.

[0066] As Figure 3 and Figure 1As shown, in some embodiments, the first liquid guiding channel 101 further includes a liquid inlet groove 1012 and a liquid outlet groove 1013. The outer surface of the liquid guiding sleeve 12 is recessed to form the liquid inlet groove 1012 and the liquid outlet groove 1013. The liquid inlet groove 1012 communicates with the liquid guiding groove 1011 and the second liquid guiding channel 201, and the liquid outlet groove 1013 communicates with the second liquid guiding channel 201 and the liquid outlet, so that the cooling medium in the second liquid guiding channel 201 can flow to the liquid outlet through the liquid outlet groove 1013.

[0067] In this way, the cooling medium enters the liquid guiding groove 1011 through the first liquid inlet, and the cooling medium flowing through the liquid guiding groove 1011 can exchange heat and dissipate heat from the motor stator in the motor housing, which helps to ensure that the components in the motor housing are fully cooled and extends the service life of the air compressor. Then it converges at the liquid inlet groove 1012. The cooling medium enters the multiple second liquid guiding channels 201 provided on the end cover respectively and flows to the cooling chamber 301, where it effectively dissipates heat from the air bearing. Then it flows through the second liquid guiding channel 201 to the liquid outlet groove 1013 and flows out along the liquid outlet groove 1013 to the first liquid outlet, thus completing the cooling and heat exchange process.

[0068] In some embodiments, a partition rib 13 is further provided on the liquid guiding sleeve 12. The partition rib 13 is protrudingly arranged relative to the outer surface of the liquid guiding sleeve 12 and is symmetrically arranged on the liquid guiding sleeve 12, thereby dividing the outer surface of the liquid guiding sleeve 12 into a liquid inlet groove 1012 and a liquid outlet groove 1013. As Figure 3 shown, the protruding structure of the partition rib 13 can better guide the flow of the coolant, so that the cooling medium can sequentially pass through the second liquid guiding channels 201 distributed on the end cover 2 and the cooling chamber 301 from the liquid inlet groove 1012 to effectively dissipate heat from the air bearing, thereby improving the cooling efficiency and the protection effect on the internal components. Then it is discharged through the liquid outlet groove 1013, ensuring that the cooling medium will not mix or cross-flow, and can also balance the flow rate and pressure of the cooling medium and avoid the occurrence of uneven flow or eddy current phenomena.

[0069] In some embodiments, a plurality of second through holes 2012 are spaced apart on the connecting portion 21 of the end cover 2. The second through holes 2012 include a second liquid inlet and a second liquid outlet. The second liquid inlet communicates with the liquid inlet groove 1012, and the second liquid outlet communicates with the liquid outlet groove 1013. The number of the second liquid inlets is the same as that of the second liquid outlets. This increases the flow path and contact area of the cooling medium, and improves the cooling effect on the air bearing 4 by increasing the second through holes 2012 and balancing the number of the liquid inlets and liquid outlets. Among them, the number of the second liquid inlets is the same as that of the second liquid outlets, making the liquid inlet and outlet more uniform, which is beneficial to balancing the flow rate and pressure of the coolant and avoiding the occurrence of uneven flow or eddy current phenomena.

[0070] In some embodiments, one of the outer surface of the air bearing 4 and the inner surface of the bearing support 3 is provided with a limiting rib 6, and the other of the outer surface of the air bearing 4 and the inner surface of the bearing support 3 is provided with a limiting groove 302. The limiting rib 6 is snap-fitted into the limiting groove 302 to connect the air bearing 4 and the bearing support 3. More specifically, as Figure 7 and Figure 8 shown, by providing a limiting rib 6 on the outer surface of the air bearing 4 and a limiting groove 302 at a corresponding position on the inner surface of the bearing support 3, the connection between the air bearing 4 and the bearing support 3 is realized. The design of the limiting rib 6 can limit the movement of the air bearing 4 within the bearing support 3 and ensure the accuracy of its position. The design of the limiting groove 302 can accommodate the limiting rib 6 and fix it in the limiting groove by snap-fitting. This connection method can enhance the stability between the air bearing 4 and the bearing support 3 and reduce loosening or displacement caused by vibration or other factors. At the same time, the design of the limiting rib 6 and the limiting groove 302 can also provide a certain amount of buffering and support when subjected to external loads, protecting the air bearing 4 and the bearing support 3 from damage and helping to improve the performance and lifespan of the air compressor.

[0071] In some embodiments, the two axial ends of the bearing support 3 are respectively in interference fit with the end caps 2, and the bearing support 3 is hermetically connected to the end caps 2 to prevent the cooling medium in the cooling cavity 301 from leaking from the connection between the bearing support 3 and the end caps 2. It can be understood that the two axial ends of the bearing support 3 are in interference fit with the end caps 2. Interference fit means that there is a certain dimensional difference between two parts, and the connection and sealing are achieved through this difference. Here, the two axial ends of the bearing support 3 are in interference fit with the end caps 2, enabling them to be tightly connected and forming an effective seal.

[0072] Furthermore, the bearing support 3 is hermetically connected to the end caps 2 to prevent the cooling medium in the cooling cavity 301 from leaking from the connection between the bearing support 3 and the end caps 2. The hermetic connection method here can take various forms, such as using sealing rings, sealants, threads, etc. This design can ensure that the cooling medium does not leak from the connection, thus guaranteeing the normal operation of the cooling structure.

[0073] An embodiment of the second aspect of the present application provides a motor, including a motor stator 7, a motor rotor 8, and the cooling structure of any of the above embodiments. Among them, the motor housing 1 and the end cap 2 enclose a cavity, and the motor stator 7 and the motor rotor 8 are installed in the cavity, thereby installing the motor stator 7 and the motor rotor 8 in a closed cavity, enabling them to be better protected and avoiding the influence of the external environment on them.

[0074] During the operation of the motor, a large amount of heat is generated in the motor stator 7 and the motor rotor 8. This heat needs to be dissipated through an effective cooling method to prevent the motor from overheating and being damaged. The cooling structure of any of the above embodiments can provide an effective cooling method for the motor. Moreover, an air bearing without lubricating grease is adopted, and the air bearing is cooled by water cooling, which can extend the service life and operating efficiency of the motor.

[0075] In some embodiments, the motor stator 7 is in interference fit with the inner wall surface of the motor housing 1. Among them, the implementation method of the interference fit is usually to set the interference fit dimension on the outer surface of the motor stator 7 so that it forms an interference fit with the inner wall surface of the motor housing 1. During the installation process, by applying a certain pressure or temperature, the motor stator 7 is closely attached to the inner wall surface of the motor housing 1 to form an effective connection. In this way, the connection stiffness and stability between the motor stator 7 and the motor housing can be enhanced, and loosening or displacement caused by vibration or other factors can be reduced. At the same time, the design of the interference fit can also improve the performance and service life of the motor and avoid failures or damages caused by loosening or displacement.

[0076] In some embodiments, at least a part of the other axial end of the mounting portion 22 of the end cover 2 extends to the inside of the motor stator 7. By extending the mounting portion 22 to the inside of the motor stator 7, the contact area with the motor stator 7 is increased, thereby improving the heat conduction efficiency. This helps to conduct the heat generated by the motor stator 7 to the cooling structure more quickly and then dissipate it, keeping the motor within an appropriate operating temperature range.

[0077] More specifically, as Figure 1 shown, the motor stator 7 includes a stator core 71 and a stator winding 72. The stator core 71 is in interference fit with the inner surface of the motor housing 1, and the end cover 2 is inserted into the stator winding 72 and maintains a certain assembly spacing.

[0078] An embodiment of the third aspect of the present application provides an air compressor, including the above-mentioned motor and a compressor driven by the motor. This air compressor design adopts an effective cooling structure and an air bearing without lubricating grease, which can quickly and effectively take away the heat generated by the motor and the compressor, reduce the temperature of the air compressor, and improve the efficiency of the air compressor.

[0079] An embodiment of the fourth aspect of the present application provides a fuel cell engine, which includes a battery reactor, a hydrogen supply system, and an air supply system. The air supply system includes an air compressor as described above. Since the air-cooled structure of the traditional fuel cell air compressor is eliminated, air can be efficiently supplied to the battery reactor, improving the efficiency and performance of the battery reactor. This fuel cell engine uses an air compressor with a grease-free air bearing, avoiding failures caused by poor lubrication or grease contamination, and improving the reliability and stability of the fuel cell engine.

[0080] An embodiment of the fifth aspect of the present application provides a vehicle, which includes a vehicle body and a fuel cell engine provided on the vehicle body. The fuel cell engine is a fuel cell engine as described above, thus having all the above beneficial effects, which will not be elaborated here.

[0081] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A cooling structure, It is characterized in that include: A motor housing, wherein the motor housing is provided with a first liquid conducting channel, and is provided with a first liquid inlet and a first liquid outlet communicating with the first liquid conducting channel, wherein the first liquid inlet is used to introduce a cooling medium, and the first liquid outlet is used to discharge the cooling medium; An end cover, the end cover comprising a connecting portion and a mounting portion penetrating at both axial ends, the connecting portion being connected to the motor housing, one axial end of the mounting portion being connected to the connecting portion, and the connecting portion being provided with a second liquid guide channel; A bearing support, wherein the bearing support is nested in the space enclosed by the mounting portion, wherein the bearing support and the inner wall of the mounting portion enclose a cooling cavity, and the cooling cavity is communicated with the second liquid guiding channel; An air bearing is assembled on the bearing support.

2. The cooling structure according to claim 1, It is characterized in that The connecting portion includes an annular plate, the inner surface of the annular plate is connected to the outer surface of one axial end of the mounting portion, the second liquid guiding channel includes first through holes distributed radially along the annular plate, the first through holes penetrate the inner surface of the annular plate and the outer surface of the annular plate, and the first through holes are connected to the cooling cavity.

3. The cooling structure according to claim 2, It is characterized in that The connecting portion further includes an annular convex strip, the annular plate has two oppositely arranged plate surfaces, one of which is arranged toward the motor housing, the annular convex strip is located on the plate surface of the annular plate arranged toward the motor housing, the annular convex strip is raised relative to the plate surface, and a plurality of second through holes are arranged at intervals on the annular convex strip, and the second through holes connect the first liquid guiding channel and the first through hole.

4. The cooling structure according to claim 3, It is characterized in that It also includes a sealing member, which is located at the first through hole on the outer surface of the annular plate to prevent the cooling medium in the second liquid guiding channel from flowing out through the outer surface of the annular plate.

5. The cooling structure according to claim 4, It is characterized in that The sealing member is a steel ball, and the steel ball is embedded in the first through hole to seal the opening of the first through hole located on the outer surface of the annular plate.

6. The cooling structure according to any one of claims 1 to 5, It is characterized in that The motor housing includes a housing member and a cooling sleeve, the housing member is provided with a through groove extending axially therethrough, the cooling sleeve is inserted into the through groove, the first liquid guide channel includes a liquid guide groove, the liquid guide groove is connected to the first liquid inlet, and the liquid guide groove extends axially spirally along the outer surface of the cooling sleeve.

7. The cooling structure according to claim 6, It is characterized in that The first liquid guiding channel also includes a liquid inlet groove and a liquid outlet groove. The outer surface of the cooling sleeve is recessed to form the liquid inlet groove and the liquid outlet groove. The liquid inlet groove connects the liquid guiding groove and the second liquid guiding channel, and the liquid outlet groove connects the second liquid guiding channel and the liquid outlet, so that the cooling medium in the second liquid guiding channel can flow to the liquid outlet through the liquid outlet groove.

8. The cooling structure according to claim 7, It is characterized in that Further comprising: Partition ribs, which are provided protruding relative to the outer surface of the cooling sleeve, and are symmetrically arranged on the cooling sleeve to divide the outer surface of the cooling sleeve to form the liquid inlet groove and the liquid outlet groove.

9. The cooling structure according to claim 8, wherein, A plurality of second through holes are spacedly arranged on the connecting portion of the end cover. The second through holes include a second liquid inlet and a second liquid outlet. The second liquid inlet communicates with the liquid inlet groove, the second liquid outlet communicates with the liquid outlet groove, and the number of the second liquid inlets is the same as that of the second liquid outlets.

10. The cooling structure according to any one of claims 1 to 5, wherein, One of the outer surface of the air bearing and the inner surface of the bearing support is provided with a limiting rib, and the other of the outer surface of the air bearing and the inner surface of the bearing support is provided with a limiting groove. The limiting rib is clamped in the limiting groove to connect the air bearing and the bearing support; and / or Axial ends of the bearing support are respectively in interference fit with the end cover, and the bearing support is hermetically connected to the end cover to prevent the cooling medium in the cooling cavity from leaking from the connection between the bearing support and the end cover.

11. An electric motor, wherein, Comprising a motor stator, a motor rotor and the cooling structure according to any one of claims 1 to 10. A cavity is formed by enclosing the motor housing and the end cover, and the motor stator and the motor rotor are installed in the cavity.

12. The electric motor according to claim 11, wherein, The motor stator is in interference fit with the inner wall surface of the motor housing; and / or The other end of the installation portion of the end cover in the axial direction at least partially extends to the inner side of the motor stator.

13. An air compressor, wherein, Comprising the electric motor according to claim 11 or 12 and a compressor driven by the electric motor.

14. A fuel cell engine, wherein, Comprising a battery reactor, a hydrogen supply system and an air supply system. The air supply system includes the air compressor according to claim 13.

15. A vehicle, wherein, Comprising a vehicle body and a fuel cell engine provided on the vehicle body. The fuel cell engine is the fuel cell engine according to claim 14.

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