CN221305644U - Cooling structure, motor, air compressor, fuel cell engine and vehicle - Google Patents

Abstract

The utility model provides a cooling structure, a motor, an air compressor, a fuel cell engine and a vehicle, wherein 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 leading in a cooling medium, and the first liquid outlet is used for leading out the cooling medium; the end cover comprises a connecting part and a mounting part with two axial ends penetrating through, 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 surrounded by the mounting part, a cooling cavity is formed by surrounding the bearing support and the inner wall of the mounting part, and the cooling cavity is communicated with the second liquid guide channel; and the air bearing is assembled on the bearing support. The cooling structure can reduce the influence of poor heat generation and heat dissipation of the air bearing on the performance of the air compressor, thereby improving the efficiency and the service life of the air compressor.

Description

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

Technical Field

The utility model relates to the technical field of vehicles, in particular to a cooling structure, a motor, an air compressor, a fuel cell engine and a vehicle.

Background

The air compressor is one of the main technical means for improving the power density and efficiency of the system of the fuel cell engine. The air compressor for the fuel cell has higher requirements on cleanliness, grease can cause poisoning of a galvanic pile system and performance reduction, so that only air bearings without lubricating grease can be used. Therefore, the air bearing has a harsh operating environment, and generates heat in the operating process, which brings great challenges to the heat dissipation requirement inside the air compressor.

Disclosure of utility model

In view of the above-mentioned shortcomings of the prior art, an object of the present utility model is to provide a cooling structure, a motor, an air compressor, a fuel cell engine and a vehicle, which effectively dissipate heat inside the air compressor.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The technical scheme of one aspect of the utility model provides a cooling structure, which comprises the following components:

The motor housing is provided with a first liquid guide channel, a first liquid inlet and a first liquid outlet, wherein 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 with two axial ends penetrating through, 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 a space surrounded by the mounting part, a cooling cavity is formed by surrounding the bearing support and the inner wall of the mounting part, and the cooling cavity is communicated with the second liquid guide channel;

And the air bearing is assembled on the bearing support.

According to some aspects of the utility model, the connecting portion includes an annular plate, an inner surface of the annular plate is connected to an outer surface of one axial end of the mounting portion, and the second liquid guide passage includes first through holes radially distributed along the annular plate, the first through holes penetrating through the inner surface of the annular plate and the outer surface of the annular plate, and the first through holes are communicated with the cooling cavity.

According to some embodiments of the present utility model, the connection portion further includes an annular protruding strip, the annular plate has two opposite plate surfaces, one of the plate surfaces is disposed towards the motor housing, the annular protruding strip is located on the plate surface of the annular plate disposed towards the motor housing, the annular protruding strip protrudes relative to the plate surface, a plurality of second through holes are disposed at intervals on the annular protruding strip, and the second through holes are communicated with the first liquid guiding channel and the first through holes.

According to some aspects of the utility model, the cooling medium flow path is a circular plate, and the cooling medium flow path is a circular plate.

According to some aspects of the utility model, the sealing member is a steel ball, and the steel ball is embedded in the first through hole so as to seal the opening of the first through hole on the outer surface of the annular plate.

According to some technical solutions of the present utility model, the motor housing includes a housing member and a cold guide sleeve, the housing member is provided with a through groove penetrating along an axial direction, the cold guide sleeve is penetrated in the through groove, the first liquid guide channel includes a liquid guide groove, the liquid guide groove is communicated with the first liquid inlet, and the liquid guide groove extends spirally along an axial direction of an outer surface of the cold guide sleeve.

According to some technical solutions of the present utility model, the first liquid guiding channel further includes a liquid inlet groove and a liquid outlet groove, the outer surface of the cold guiding sleeve is recessed to form the liquid inlet groove and the liquid outlet groove, the liquid inlet groove is communicated with the liquid guiding groove and the second liquid guiding channel, and the liquid outlet groove is communicated with 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.

According to some technical schemes of the utility model, the motor shell further comprises a baffle rib, the baffle rib is convexly arranged relative to the outer surface of the cold guide sleeve, and the baffle rib is symmetrically arranged on the cold guide sleeve so as to separate the outer surface of the cold guide sleeve into the liquid inlet groove and the liquid outlet groove.

According to some technical schemes of the utility model, the connecting part of the end cover is provided with a plurality of second through holes at intervals, the second through holes comprise a second liquid inlet and a second liquid outlet, the second liquid inlet is communicated with the liquid inlet groove, the second liquid outlet is communicated with the liquid outlet groove, and the number of the second liquid inlets is the same as that of the second liquid outlets.

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

According to some technical schemes of the utility model, two axial ends of the bearing support are respectively in interference fit with the end cover, and the bearing support is in sealing connection with the end cover so as to avoid leakage of cooling medium in the cooling cavity from the joint of the bearing support and the end cover.

The technical scheme of the two aspects of the utility model provides a motor, which comprises a motor stator, a motor rotor and the cooling structure in the embodiment, wherein the motor shell and the end cover are enclosed to form a cavity, and the motor stator and the motor rotor are arranged in the cavity.

According to some technical schemes of the utility model, the motor stator is in interference fit with the inner wall surface of the motor shell.

According to some aspects of the utility model, the axial other end of the mounting portion of the end cap extends at least partially inside the motor stator.

The technical schemes of the three aspects of the utility model provide an air compressor, which comprises the motor and the compressor driven by the motor.

The technical scheme of the four aspects of the utility model provides a fuel cell engine, which comprises a cell reactor, a hydrogen supply system and an air supply system, wherein the air supply system comprises an air compressor as described in the embodiment.

The technical scheme of the five aspects of the utility model provides a vehicle, which comprises a vehicle body and a fuel cell engine arranged on the vehicle body, wherein the fuel cell engine is the fuel cell engine in the embodiment.

Compared with the prior art, the application has at least the following advantages:

according to the application, the first liquid guide channel, the first liquid inlet communicated with the first liquid guide channel and the first liquid outlet are arranged on the motor shell, so that a cooling medium can flow into the motor shell to radiate heat of heating elements such as a stator in the motor shell, and the cooling medium taking away the heat flows out of the motor shell through the first liquid outlet, thereby efficiently cooling the motor stator; the end cover comprises a connecting part and mounting parts penetrating through the two axial ends, wherein the connecting part of the end cover is connected with the motor shell, the mounting parts are connected to the connecting part and are used for mounting the bearing support, the bearing support is internally provided with an air bearing, a cooling cavity is formed between the mounting parts and the bearing support, and therefore, a first liquid guide channel can flow to the cooling cavity, cooling medium flowing through the cooling cavity can directly take away heat on the surface of the bearing support, so that heat generated by the air bearing can be effectively dissipated, effective cooling of the air bearing is realized, and the influence of heat generation and poor heat dissipation of the air bearing on the performance of the air compressor can be reduced by the cooling structure, and the efficiency and the service life of the air compressor are improved.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

FIG. 1 is a cross-sectional view of an electric motor according to an embodiment of the present application;

FIG. 2 is a schematic view of a housing member according to an embodiment of the present application;

FIG. 3 is a schematic view of a cold guide sleeve according to an embodiment of the present application;

FIG. 4 is a schematic perspective view of an end cap according to an embodiment of the present application;

FIG. 5 is a cross-sectional view of one embodiment of an end cap of the present application;

FIG. 6 is a second cross-sectional view of an end cap according to an embodiment of the present application;

FIG. 7 is a schematic illustration of an air bearing according to an embodiment of the present application;

fig. 8 is a schematic view of a bearing support according to an embodiment of the present application.

Wherein, the correspondence between the reference numerals and the component names is:

The motor comprises a motor shell, a first liquid guide channel 101, a liquid guide groove 1011, a liquid inlet groove 1012, a liquid outlet groove 1013, a first liquid inlet 102, a first liquid outlet 103, a shell piece 11, a cold guide sleeve 12 and a separation rib 13;

2 end caps, 201 second liquid guide channels, 2011 first through holes, 2012 second through holes, 21 connecting parts, 211 annular plates, 212 annular raised strips and 22 mounting parts;

3 bearing support, 301 cooling cavity, 302 limit groove;

4, an air bearing;

5 a sealing member;

6, limiting the convex ribs;

7 motor stator, 71 stator core, 72 stator windings;

8, a motor rotor.

Detailed Description

While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated.

Thus, rather than implying that each embodiment of the present application must have the characteristics described, one of the characteristics indicated in this specification will be used to describe one embodiment of the present application. Furthermore, it should be noted that the present specification describes a number of features. Although certain features may be combined together to illustrate a possible system design, such features may be used in other combinations not explicitly described. Thus, unless otherwise indicated, the illustrated combinations are not intended to be limiting.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The application provides a cooling structure, a motor, an air compressor, a fuel cell engine and a vehicle, which can effectively dissipate heat in the air compressor.

Preferred embodiments of the present application will be further elaborated below with reference to the drawings of the present specification.

Referring to fig. 1 to 8, an embodiment of an 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.

The motor housing 1 is provided with a first liquid-conducting channel 101 for introducing and removing a cooling medium. The motor housing 1 is provided with a first liquid inlet 102 communicated with the first liquid guide channel 101, the first liquid inlet 102 is used for guiding cooling medium into the cooling structure, the motor housing 1 is also provided with a first liquid outlet 103 communicated with the first liquid guide channel 101, and the first liquid outlet 103 is used for guiding the cooling medium flowing through the first liquid guide channel 101, the second liquid guide channel 201 and the cooling cavity 301 for heat exchange. The cooling medium can directly use cold water or cooling liquid with good heat absorption effect.

As shown in fig. 4, the end cap 2 includes a connecting portion 21 and mounting portions 22 penetrating both ends in the axial direction, the connecting portion 21 is connected to the motor housing 1, one end in the axial direction of the mounting portions 22 is connected to the connecting portion 21, and the connecting portion 21 is provided with a second liquid guide passage 201. The connection portion 21 and the motor housing 1 may be welded or fixed to each other, and the mounting portion formed by penetrating the two ends of the end cover in the axial direction may guide the cooling medium to flow to the outer side of the bearing support, so as to form a structure for cooling the air bearing in a water-cooled manner, and cool the air bearing better.

The bearing support 3, the bearing support 3 nest in the space that the installation department 22 encloses, enclose between the inner wall of bearing support 3 and installation department 22 and close and form cooling chamber 301, cooling chamber 301 and second drain passageway 201 intercommunication, thus, the clearance between bearing support 3 and the installation department 22 has formed the circulation space of coolant liquid, and the aforesaid cooling chamber 301 promptly, cooling chamber 301 and second drain passageway 201 intercommunication for the cooling medium can flow through the space between bearing support 3 and the installation department 22. Further, the air bearing 4 is assembled on the bearing support 3, and a large amount of heat is generated due to the high-speed rotation of the air bearing 4, so that the cooling liquid flowing through the cooling cavity 301 can absorb the heat generated by the air bearing 4 and take away the heat, thereby realizing effective cooling of the air bearing. In particular, the mounting portion 22 is designed as a ring-shaped body in order to be suitable for the mounting of air bearings and bearing holders, so that the cooling structure is more compact.

As shown in fig. 4, in some embodiments, the connecting portion 21 includes an annular plate 211, an inner surface of the annular plate 211 is connected to an outer surface of an axial end of the mounting portion 22, the second liquid guiding channel 201 includes first through holes 2011 distributed along a radial direction of the annular plate 211, the first through holes 2011 penetrate through the inner surface of the annular plate 211 and the outer surface of the annular plate 211, and the first through holes 2011 are in communication 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 the stable operation thereof.

For more detailed example, as shown in fig. 5, the number of the first through holes 2011 is plural, so that the cooling medium can enter the cooling cavity 301 from a plurality of points, and the plurality of first through holes 2011 can form a plurality of cooling liquid flows in the cooling cavity 301, and the liquid flows are distributed more uniformly in the cooling cavity 301, so that the cooling efficiency is improved, and the stable operation of the air bearing is ensured.

In some embodiments, the connection portion 21 further includes an annular protruding strip 212, the annular plate 211 has two opposite plate surfaces, one of the plate surfaces is disposed towards the motor housing 1, the annular protruding strip 212 is located on the plate surface of the annular plate 211 disposed towards the motor housing 1, the annular protruding strip 212 protrudes relative to the plate surface, a plurality of second through holes 2012 are disposed at intervals on the annular protruding strip 212, and the second through holes 2012 are in communication with the first liquid guiding channel 101 and the first through holes 2011. Through being equipped with annular sand grip 212 on the face that sets up towards motor housing 1, annular sand grip 212 interval sets up a plurality of second through-holes 2012, second through-holes 2012 intercommunication first drain passageway 101 and first through-hole 2011 are favorable to making coolant flow through longer flow path in the entering end cover like this, moreover, a plurality of first through-holes 2011 correspond the setting with second through-hole 2012, longer coolant flow path means that coolant distributes more evenly in cooling chamber 301 to better control air bearing's temperature, can reduce the trouble because of overheated and thermal stress leads to, thereby improve air compressor machine's reliability and stability.

As shown in fig. 5, in more detail, the second through holes 2012 provided on the annular protruding strip 212 are provided at equal intervals, and correspondingly, the first through holes 2011 provided on the annular plate 211 are also provided at equal intervals, so that the cooling medium can be uniformly distributed on the outer peripheral side of the air bearing, and a better heat dissipation effect is achieved.

In some embodiments, the cooling medium in the second liquid guiding channel 201 is prevented from flowing out through the outer surface of the annular plate 211 by the sealing member 5, wherein the sealing member 5 is located at the first through hole 2011 on the outer surface of the annular plate 211. In this way, by adding an additional seal 5, the outflow of cooling medium from the outer surface of the annular plate 211 can be effectively prevented, ensuring that the cooling medium can enter the first through holes 2011 more. In addition, the sealing piece 5 can also prevent external impurities and moisture from entering the cooling structure, so that the purity of the cooling medium is maintained, the cooling structure is protected from being damaged, and the service life of the air compressor is prolonged.

In some embodiments, the seal may be a sealing ring, and the sealing ring is abutted against the opening of the first through hole 2011 on the outer surface of the annular plate 211 and the motor housing to perform a sealing function.

As shown in fig. 1, in some embodiments, the sealing member 5 is a steel ball, and the steel ball is embedded in the first through hole 2011 to seal the opening of the first through hole 2011 located on the outer surface of the annular plate 211. The steel balls have good elasticity and wear resistance, can adapt to different pressure and temperature changes of the cooling medium, and can be tightly attached to the outer surface of the annular plate when the cooling medium flows through the first liquid guide channel and the first through hole, so that the cooling medium is prevented from flowing out of the outer surface of the annular plate. The use of steel balls as the sealing member 5 can provide a more reliable and adaptable sealing effect, help ensure that the cooling liquid flows completely through the preset path, and improve the cooling efficiency of the air bearing and the protection effect on the internal components.

As shown in fig. 2 and 3, in some embodiments, the motor housing 1 includes a housing member 11 and a cold guide sleeve 12, where the housing member 11 is provided with a through slot penetrating in an axial direction, the cold guide sleeve 12 is penetrated in the through slot, the first liquid guide channel 101 includes a liquid guide groove 1011, the liquid guide groove 1011 is communicated with the first liquid inlet 102, and the liquid guide groove 1011 extends spirally along an axial direction of an outer surface of the cold guide sleeve 12. On the one hand, the shell member 11 is provided with a through groove penetrating along the axial direction, and the cold guide sleeve 12 is penetrated in the through groove, so that the stability and the cooling effect of the motor shell are enhanced. On the other hand, the liquid guide groove 1011 extends spirally along the axial direction of the outer surface of the cold guide sleeve 12, so that the liquid guide groove 1011 can cover the surface of the motor housing more fully, in this way, the cooling medium can flow circularly along the liquid guide groove 1011 relative to the surface of the motor housing, thereby increasing the contact area between the cooling medium and the motor stator arranged inside the motor housing, and the spirally extending liquid guide groove 1011 increases the flow path of the cooling medium, more cooling medium is introduced in unit time, thereby realizing the efficient heat dissipation of the motor stator and improving the heat dissipation effect of the air bearing.

Specifically, the housing member 11 has a circular ring shape, and the cooling jacket 12 has a circular ring shape.

More specifically, the cold guide sleeve comprises a cylinder body, the cylinder body penetrates through the through groove, the cylinder body abuts against the through groove, and the circumferential side surface of the cylinder body is recessed to form a liquid guide groove. Or the cold guide sleeve comprises a cylinder body and convex ribs, the convex ribs are convexly arranged relative to the outer surface of the cylinder body and spirally extend along the axial direction of the cylinder body, and the convex ribs and the surface of the shell part enclose a liquid guide groove.

As shown in fig. 3 and 1, 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 cold 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.

Like this, coolant gets into liquid guide groove 1011 through first inlet, and the coolant that flows through liquid guide groove 1011 can carry out heat transfer heat dissipation to the motor stator in the motor housing, helps guaranteeing that the component in the motor housing obtains abundant cooling to the life of air compressor machine has been prolonged. Then, the cooling medium is converged to the liquid inlet groove 1012, enters the plurality of second liquid guide channels 201 arranged on the end cover respectively and flows to the cooling cavity 301, the air bearing is effectively radiated at the cooling cavity 301, then flows to the liquid outlet groove 1013 through the second liquid guide channels 201, flows out to the first liquid outlet along the liquid outlet groove 1013, and the cooling heat exchange process is completed.

In some embodiments, the cold guide sleeve 12 is further provided with a baffle rib 13, and the baffle rib 13 is convexly arranged relative to the outer surface of the cold guide sleeve 12 and symmetrically arranged on the cold guide sleeve 12, so as to divide the outer surface of the cold guide sleeve 12 into a liquid inlet groove 1012 and a liquid outlet groove 1013. As shown in fig. 3, the convex structure of the baffle rib 13 can better guide the flow of the cooling liquid, so that the cooling medium can effectively dissipate heat of the air bearing sequentially from the liquid inlet groove 1012 through the second liquid guide channels 201 distributed on the end cover 2 and the cooling cavity 301, thereby improving the cooling efficiency and the protection effect on the internal elements, and then is discharged through the liquid outlet groove 1013, so as to ensure that the cooling medium cannot mix or cross flow, balance the flow and pressure of the cooling medium, and avoid the phenomenon of bias current or vortex.

In some embodiments, a plurality of second through holes 2012 are disposed on the connecting portion 21 of the end cap 2 at intervals, the second through holes 2012 include a second liquid inlet and a second liquid outlet, the second liquid inlet is communicated with the liquid inlet groove 1012, the second liquid outlet is communicated with the liquid outlet groove 1013, and the number of the second liquid inlets is the same as the number 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 number of the second through holes 2012 and the balance liquid inlet and outlet. The second liquid inlets and the second liquid outlets are the same in number, so that liquid inlets and liquid outlets are more uniform, flow and pressure of the cooling liquid are balanced, and drift or vortex phenomenon is avoided.

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 limit 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 limit groove 302, and the limit rib 6 is clamped in the limit groove 302 so as to connect the air bearing 4 and the bearing support 3. In more detail, as shown in fig. 7 and 8, the connection of the air bearing 4 and the bearing support 3 is achieved by providing the spacing ribs 6 on the outer surface of the air bearing 4 and the spacing grooves 302 at positions corresponding to the inner surface of the bearing support 3. The design of the limiting convex rib 6 can limit the movement of the air bearing 4 in the bearing support 3 and ensure the accuracy of the position of the air bearing, and the design of the limiting groove 302 can accommodate the limiting convex rib 6 and fix the limiting convex rib 6 in the limiting groove in a clamping manner. This connection enhances the stability between the air bearing 4 and the bearing support 3 and reduces loosening or displacement due to vibrations or other factors. Meanwhile, the design of the limiting ribs 6 and the limiting grooves 302 can also provide certain buffering and supporting when external load is received, so that the air bearing 4 and the bearing support 3 are protected from being damaged, and the performance and the service life of the air compressor are improved.

In some embodiments, the two axial ends of the bearing support 3 are respectively in interference fit with the end cover 2, and the bearing support 3 is in sealing connection with the end cover 2 so as to avoid leakage of the cooling medium in the cooling cavity 301 from the connection position of the bearing support 3 and the end cover 2. It will be appreciated that the two axial ends of the bearing support 3 are interference fitted with the end cap 2, by which is meant that there is a dimensional difference between the two parts by which the connection and sealing is achieved, where the two axial ends of the bearing support 3 are interference fitted with the end cap 2 so that a tight connection is possible between them and an effective seal is formed.

Further, the bearing support 3 is sealingly connected to the end cap 2 to avoid leakage of the cooling medium in the cooling chamber 301 from the connection between the bearing support 3 and the end cap 2, where the sealing connection may take various forms, such as using sealing rings, sealant, threads, etc. This design ensures that the cooling medium does not leak from the connection, thereby ensuring proper operation of the cooling structure.

An embodiment of the second aspect of the application provides an electric machine comprising a motor stator 7, a motor rotor 8 and a cooling structure of any of the above embodiments. Wherein, the motor housing 1 encloses with end cover 2 and closes and form the cavity, and motor stator 7 and motor rotor 8 are installed in the cavity to install motor stator 7 and motor rotor 8 in a confined cavity, make them receive the protection better, and avoid the influence that external environment produced it.

During operation of the motor, the motor stator 7 and the motor rotor 8 generate a lot of heat which needs to be dissipated by an efficient cooling way to avoid damage due to overheating of the motor. The cooling structure of any embodiment can provide an effective cooling mode for the motor, and the air bearing without lubricating grease is adopted, so that the air bearing is cooled through water cooling, and the service life and the service efficiency of the motor can be prolonged.

In some embodiments, the motor stator 7 is interference fit with the inner wall surface of the motor housing 1. The interference fit is usually achieved by providing an 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. In the mounting process, the motor stator 7 is tightly attached to the inner wall surface of the motor housing 1 by applying a certain pressure or temperature, so that an effective connection is formed. In this way, the connection stiffness and stability between the motor stator 7 and the motor housing can be enhanced and loosening or displacement due to vibrations or other factors is reduced, while the design of the interference fit can also improve the performance and lifetime of the motor and avoid failure or damage due to loosening or displacement.

In some embodiments, the axial other end of the mounting portion 22 of the end cap 2 extends at least partially inside 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 transfer heat generated by the motor stator 7 more quickly to the cooling structure and thus to dissipate, keeping the motor within a suitable operating temperature range.

In more detail, as shown in fig. 1, the motor stator 7 includes a stator core 71 and a stator winding 72, the stator core 71 is interference-fitted with the inner surface of the motor housing 1, and the end cap 2 is inserted inside the stator winding 72 while maintaining a certain fitting interval.

An embodiment of the third aspect of the present application provides an air compressor, including the above motor and a compressor driven by the motor. The air compressor adopts an effective cooling structure and an air bearing without lubricating grease, so that heat generated by a motor and a compressor can be taken away rapidly and effectively, the temperature of the air compressor is reduced, and the efficiency of the air compressor is improved.

An embodiment of a fourth aspect of the present application provides a fuel cell engine comprising a cell reactor, a hydrogen gas supply system and an air supply system comprising an air compressor as described above. Because the air cooling structure of the traditional fuel cell air compressor is eliminated, air can be efficiently supplied to the cell reactor, and the efficiency and performance of the cell reactor are improved; the air compressor of the air bearing without lubricating grease is adopted by the fuel cell engine, so that faults caused by poor lubrication or grease pollution are avoided, and the reliability and stability of the fuel cell engine are improved.

An embodiment of the fifth aspect of the present application provides a vehicle, including a vehicle body and a fuel cell engine disposed on the vehicle body, where the fuel cell engine is a fuel cell engine as described above, so as to have all the above advantages, which are not described herein.

It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.

Claims (15)

1. A cooling structure, characterized by comprising:

The motor housing is provided with a first liquid guide channel, a first liquid inlet and a first liquid outlet, wherein 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 with two axial ends penetrating through, 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 a space surrounded by the mounting part, a cooling cavity is formed by surrounding the bearing support and the inner wall of the mounting part, and the cooling cavity is communicated with the second liquid guide channel;

And the air bearing is assembled on the bearing support.

2. The cooling structure according to claim 1, wherein,

The connecting portion comprises an annular plate, the inner surface of the annular plate is connected with the outer surface of one axial end of the mounting portion, the second liquid guide channel comprises first through holes distributed along the radial direction of the annular plate, the first through holes penetrate through the inner surface of the annular plate and the outer surface of the annular plate, and the first through holes are communicated with the cooling cavity.

3. The cooling structure according to claim 2, wherein,

The connecting portion further comprises annular raised strips, the annular plate is provided with two oppositely arranged plate surfaces, one plate surface faces towards the motor housing, the annular raised strips are located on the plate surface of the annular plate, which faces towards the motor housing, the annular raised strips are raised relative to the plate surface, a plurality of second through holes are formed in the annular raised strips at intervals, and the second through holes are communicated with the first liquid guide channel and the first through holes.

4. A cooling structure according to claim 3, wherein,

The cooling medium cooling device further comprises a sealing piece, wherein the sealing piece is positioned at the first through hole on the outer surface of the annular plate so as to prevent the cooling medium in the second liquid guide channel from flowing out through the outer surface of the annular plate.

5. The cooling structure according to claim 4, wherein,

The sealing piece is a steel ball which is embedded into the first through hole so as to seal the opening of the first through hole on the outer surface of the annular plate.

6. A cooling structure according to any one of claims 1 to 5, wherein,

The motor shell comprises a shell part and a cold guide sleeve, wherein the shell part is provided with a through groove penetrating along the axial direction, the cold guide sleeve penetrates through the through groove, the first liquid guide channel comprises a liquid guide groove, the liquid guide groove is communicated with the first liquid inlet, and the liquid guide groove extends along the axial spiral of the outer surface of the cold guide sleeve.

7. The cooling structure according to claim 6, wherein,

The first liquid guide channel further comprises a liquid inlet groove and a liquid outlet groove, the outer surface of the cold guide sleeve is sunken to form the liquid inlet groove and the liquid outlet groove, the liquid inlet groove is communicated with the liquid guide groove and the second liquid guide channel, and the liquid outlet groove is communicated with the second liquid guide channel and the liquid outlet, so that cooling medium in the second liquid guide channel can flow to the liquid outlet through the liquid outlet groove.

8. The cooling structure according to claim 7, characterized by further comprising:

The baffle ribs are arranged protruding relative to the outer surface of the cold guide sleeve, and are symmetrically arranged on the cold guide sleeve so as to separate the outer surface of the cold guide sleeve into the liquid inlet groove and the liquid outlet groove.

9. The cooling structure according to claim 8, wherein,

The connecting part of the end cover is provided with a plurality of second through holes at intervals, each second through hole comprises a second liquid inlet and a second liquid outlet, each second liquid inlet is communicated with the corresponding liquid inlet groove, each second liquid outlet is communicated with the corresponding liquid outlet groove, and the number of the second liquid inlets is the same as that of the second liquid outlets.

10. A 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 limit convex rib, the other one of the outer surface of the air bearing and the inner surface of the bearing support is provided with a limit groove, and the limit convex rib is clamped in the limit groove so as to connect the air bearing and the bearing support; and/or

The axial two ends of the bearing support are respectively in interference fit with the end cover, and the bearing support is in sealing connection with the end cover so as to prevent cooling medium in the cooling cavity from leaking from the joint of the bearing support and the end cover.

11. An electric machine comprising a motor stator, a motor rotor and a cooling structure according to any one of claims 1 to 10, wherein the motor housing and the end cap enclose a cavity, and the motor stator and the motor rotor are mounted in the cavity.

12. The motor of claim 11, wherein the motor is configured to control the motor,

The motor stator is in interference fit with the inner wall surface of the motor shell; and/or

The other axial end of the mounting part of the end cover extends at least partially to the inner side of the motor stator.

13. An air compressor comprising the motor of claim 11 or 12 and a compressor driven by the motor.

14. A fuel cell engine comprising a cell reactor, a hydrogen gas supply system, and an air supply system comprising the air compressor of claim 13.

15. A vehicle comprising a vehicle body and a fuel cell engine provided on the vehicle body, the fuel cell engine being the fuel cell engine according to claim 14.