Electric pump

Abstract

The utility model discloses an electric pump which comprises a rotor assembly and a thrust part, the rotor assembly comprises a bearing and a rotor, the bearing is fixedly connected with the rotor, the thrust part is arranged on one side of the bearing in the axial direction of the electric pump, the thrust part comprises a thrust surface and a water passing groove, the water passing groove is concaved in the thrust surface, and in the operation process of the electric pump, the thrust surface and the water passing groove are matched with each other. The end face of the bearing makes contact with the thrust part, the electric pump comprises an inner cavity, and the water passing groove communicates with the inner cavity. In this way, heat dissipation of the bearing is facilitated, and then the service life of the bearing is prolonged.

Description

[Technical field]

[0001] The present application relates to the field of fluid control, and in particular to an electric pump. [Background technology]

[0002] The electric pump includes a rotor assembly and a thrust part. The rotor assembly includes a bearing and a rotor. The bearing is fixedly connected to the rotor. The bearing and the thrust part form a thrust structure for limiting the axial movement of the rotor assembly. During the operation of the electric pump, there is frictional heat generated by the friction between the thrust part and the bearing. If the heat at this location cannot be dissipated promptly and effectively, the service life of the bearing will be affected. [Contents of the utility model]

[0003] The utility model aims to provide an electric pump, which is beneficial to prolonging the service life of the bearing.

[0004] To achieve the above-mentioned purpose, an embodiment provided in the present application adopts the following technical scheme: an electric pump includes a rotating component and a thrust part, the rotating component includes a bearing and a rotor, the bearing is fixedly connected to the rotor, and along the axial direction of the electric pump, the thrust part is arranged on one side of the bearing, the thrust part includes a thrust surface, the electric pump has a water groove, the water groove is recessed in the thrust surface, during the operation of the electric pump, the end face of the bearing contacts with the thrust surface, the electric pump includes an inner cavity, and the water groove is connected to the inner cavity.

[0005] In one embodiment of the present application, a water groove is arranged on the thrust part, and the inner cavity is connected to the water groove. When the electric pump is working, the working medium can flow through the water groove, which is beneficial to heat the bearing and further helps to increase the service life of the bearing.

Brief Description of the Drawings

[0006] Figure 1 It is a three-dimensional structural schematic diagram of a first embodiment of the electric pump of the present application;

[0007] Figure 2 yes Figure 1 A schematic structural diagram of the first embodiment of the electric pump along the XX section;

[0008] Figure 3 yes Figure 2 The enlarged structural diagram at position I in the middle;

[0009] Figure 4 yes Figure 1 A schematic diagram of the structure of the second embodiment of the electric pump along the XX section;

[0010] Figure 5 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the middle pump cover in one direction;

[0011] Figure 6 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the middle stop thrust part in one direction;

[0012] Figure 7 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the middle thrust stop in another direction;

[0013] Figure 8 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the middle contact portion in one direction;

[0014] Fig. 9 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the rotating component in the electric pump in one direction;

[0015] Fig.10 yes Fig. 9 Schematic diagram of the structure of the middle rotating component along the AA section;

[0016] Fig.11 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the stator winding in the electric pump in one direction;

[0017] Fig.12 yes Figure 2 and Figure 4 A schematic diagram of the three-dimensional structure of the first component of the electric pump in one direction;

[0018] Fig.13 yes Fig.12 The schematic diagram of the structure of the stator assembly along the YY section;

[0019] In the accompanying drawings: 100, electric pump;

[0020] 11. Pump cover; 111. Inlet; 112. Inlet; 113. Thrust portion; 1131. Support portion; 1132. Contact portion; 1132a. Fixing portion; 1132b. Extending portion; 1132c. Thrust surface; 114. Pump housing;

[0021] 12. stator assembly; 121. stator housing; 122. stator winding; 1221. stator core; 1222. insulation frame; 1223. winding;

[0022] 13, inner cavity; 131, rotor cavity; 132, impeller cavity;

[0023] 14. Rotating assembly; 141. Rotor assembly; 1411. Rotor; 1412. Bearing; 1413. Injection molding part; 142. Impeller assembly; 143. Impeller liquid inlet hole; 144. Rotating hole;

[0024] 15. Pass through the water tank;

[0025] 16, shaft; 161, limiting portion; 162, mounting portion; 163, matching portion; 17, reflux channel; 18, inner hole; 181, mounting hole; 182, reflux hole;

[0026] 19. Control panel assembly;

[0027] 22. Inner groove. [Specific implementation method]

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0029] The specific implementation methods of the present application are further described in detail below in conjunction with the accompanying drawings. First of all, it should be noted that the directional terms such as up, down, left, right, front, back, inside, outside, top, bottom, etc. mentioned or may be mentioned in the specification of the present invention are defined relative to the structure shown in the corresponding drawings. They are relative concepts, and therefore may change accordingly according to their different locations and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0030] The electric pump in the following embodiments can provide flow power for the working medium of the automotive thermal management system. The working medium may be water or an aqueous solution, such as an aqueous solution including 50% ethylene glycol. Of course, the working medium may also be other substances.

[0031] See also Figures 1 to 13As shown, the present application provides an electric pump 100, which includes a pump cover 11, a stator assembly 12, a rotating assembly 14 and a shaft 16; the stator assembly 12 includes a stator winding 122 and a stator housing 121, and the stator winding 122 includes a stator core 1221, an insulating frame 1222 and a winding 1223. The pump cover 11 is sealed and fixedly connected to the stator assembly 12. It should be noted that the sealing and fixing here means that when the electric pump 100 is working, the working medium in the electric pump 100 will not leak to the outside of the electric pump 100 through the joint surface between the pump cover 11 and the stator assembly 12. The shaft 16 is fixedly connected to the stator assembly 12. Specifically, the shaft 16 is fixed to the stator housing 121 by injection molding. It can be understood that part of the shaft 16 is embedded in the stator housing 121. The electric pump 100 has an inner cavity 13, and the rotating assembly 14 is located in the inner cavity 13. The inner cavity 13 includes a rotor cavity 131 and an impeller cavity 132, and the rotor cavity 131 and the impeller cavity 132 are connected. The inner cavity 13 can have a working medium flowing through it. The rotating assembly 14 includes a rotor assembly 141 and an impeller assembly 142, and the rotor assembly 141 includes a permanent magnet. At least part of the rotor assembly 141 is located in the rotor cavity 131, and the impeller assembly 142 is located in the impeller cavity 132. In a specific embodiment, the other end of the shaft 16 is at least partially located in the rotor cavity 131, at least part of the rotating assembly 14 is sleeved on the outer periphery of the shaft 16, and part of the shaft 16 is fixed to the stator housing 121, and the rotating assembly 14 can rotate around the shaft 16. Of course, as other embodiments, the rotating assembly 14 and the shaft 16 are fixedly connected, and the shaft 16 rotates with the rotating assembly 14. The electric pump 100 may also include a control board assembly 19, which is electrically connected to the stator assembly 12. The pump cover 11 has an inlet 111 and an outlet 112. The inlet 111 is used for the working medium to flow into the electric pump 100, and the outlet 112 is used for the working medium to flow out of the electric pump 100. When the electric pump 100 is working, the electric pump 100 is connected to an external power supply, and the excitation magnetic field generated by the stator winding 122 is controlled by controlling the current of the stator winding 122. The rotating assembly 14 rotates around the shaft 16 under the action of the excitation magnetic field, so that the working medium entering the inner cavity 13 through the inlet 111 rotates with the rotating assembly 14, and the working medium will leave the electric pump 100 through the outlet 112 under the action of the centrifugal force.

[0032] See also Fig.11As shown, the stator winding 122 includes a stator core 1221, an insulating frame 1222 and a winding 1223, the number of windings 1223 is at least three, the insulating frame 1222 is coated on at least part of the surface of the stator core 1221, and the insulating frame 1222 is used to isolate the winding 1223 and the stator core 1221, so that the winding 1223 and the stator core 1221 are electrically insulated. The insulating frame 1222 and the stator core 1221 can be an integrated structural member. Specifically, as an implementation method, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. Of course, as other implementation methods, the insulating frame 1222 and the stator core 1221 are separately set, and the "separate setting" here means that the insulating frame 1222 and the stator core 1221 are respectively processed into two separate parts and then assembled. The connection is limited or fixed by assembly. In this embodiment, the insulating frame 1222 is formed by injection molding with the stator core 1221 as an insert. It can be understood that the stator core 1221 and the insulating frame 1222 are an integrated structure. The winding 1223 is wound around the insulating frame 1222. As a specific embodiment, the winding 1223 includes nine windings 1223. Of course, as other embodiments, the winding 1223 can also include other numbers of windings 1223, such as three, six, twelve, or other numbers.

[0033] As an implementation, see Figure 2 , Figure 3 , Figures 11 to 13As shown, the electric pump 100 includes a stator assembly 12, the stator assembly 12 includes a stator winding 122 and a stator housing 121, the stator housing 121 is at least formed by insert injection molding with the stator winding 122, and one end of the shaft 16 is fixed to the stator housing 121 by injection molding. Specifically, the stator housing 121 includes a first housing 1211 and a second housing 1212, the first housing 1211 is at least formed by insert injection molding with the stator winding 122, and a first assembly is defined, the first assembly includes the stator winding 122 and the first housing 1211, the second housing 1212 is at least formed by insert injection molding with the first assembly, and in this embodiment, the second housing 1212 is formed by insert injection molding with the shaft 16 and the first assembly. Specifically, the wall corresponding to the rotor cavity 131 is formed in the second housing 1212. In this way, it is helpful to reduce the risk of leakage of the working medium in the rotor cavity through the joint surface of the first housing 1211 and the second housing 1212. Specifically, the shaft 16 includes a limiting portion 161, a mounting portion 162 and a matching portion 163. The limiting portion 161 is fixed to the second housing 1212 by injection molding. The rotor assembly 141 is mounted on the mounting portion 162. The matching portion 163 is limitedly matched with the pump cover 11. It should be noted that the limited matching here includes interference fit, transition fit and clearance fit. In this way, the stator assembly and the pump cover are equivalent to supporting both ends of the shaft to form a simply supported beam structure, which is conducive to improving the coaxiality accuracy of the shaft 16 relative to the stator assembly 12.

[0034] Please refer to Figures 1 to 5 As shown, the electric pump 100 includes a pump cover 11, and the pump cover 11 has an inlet 111 and an outlet 112. The inner cavity 13 includes a rotor cavity 131 and an impeller cavity 132. The wall portion forming the rotor cavity 131 is located in the second shell, and the wall portion forming the impeller cavity 132 is located in the pump cover 11. The pump cover 11 is fixedly connected to the stator assembly 12. Specifically, as an implementation method, the pump cover 11 and the stator assembly 12 are welded and fixed. In this way, it is helpful to reduce the parts of the electric pump, thereby laying a certain foundation for the cost reduction of the electric pump. As another implementation method, the pump cover 11 and the stator assembly 12 are fixedly connected by a fixing structure. The fixing structure here includes a screw or bolt fixing connection method, or the pump cover 11 and the stator assembly 12 are fixed by a clamping method.

[0035] Please refer to Figures 2 to 8As shown, the electric pump includes a rotor assembly 141 and a thrust portion 113, the rotor assembly 141 includes a bearing 1412 and a rotor 1411, the bearing 1412 is fixedly connected to the rotor 1411, the bearing 1412 and the thrust portion 113 form a thrust structure for limiting the axial movement of the rotor assembly 141, during the operation of the electric pump 100, there is friction heat generated by the friction between the thrust portion 113 and the bearing 1412, which will cause local high temperature on the end face of the bearing 1412, if the heat therein cannot be dissipated in time and effectively, it may affect the deformation of the bearing 1412, and the rotor assembly 141 will be locked, which will make the electric pump 100 unable to operate normally on the one hand, and on the other hand, it will cause the service life of the bearing 1412 to be reduced, therefore, how to improve the service life of the bearing 1412 is a technical problem that technicians in this field need to consider. At present, in the actual application process, the material of the bearing is usually improved so that the bearing has good wear resistance, which will undoubtedly increase the cost of the electric pump. Therefore, this application is considered through other technical ideas.

[0036] As an implementation, see Figures 2 to 10 As shown, the electric pump 100 includes a rotor assembly 141 and a thrust portion 113, the rotor assembly 141 includes a bearing 1412 and a rotor 1411, the bearing 1412 is fixedly connected to the rotor 1411, along the axial direction of the electric pump 100, the thrust portion 113 is arranged on one side of the bearing 1412, the thrust portion 113 includes a thrust surface 1132c and a water groove 15, the water groove 15 is recessed in the thrust surface 1132c, during the operation of the electric pump 100, the end surface of the bearing 1412 contacts the thrust portion 113, the electric pump 100 includes an inner cavity 13, and the water groove 15 is connected to the inner cavity 13. In this way, first, the water groove 15 is arranged on the thrust portion 113, which is conducive to improving the structural strength of the bearing 1412 and the service life of the bearing 1412 relative to the technical solution of the water groove 15 being arranged on the bearing 1412. Second, the working medium flowing in the water groove 15 will contact the end of the bearing 1412, which is beneficial to the local heat dissipation of the end of the bearing 1412, thereby helping to increase the service life of the bearing 1412. Third, the working medium flowing in the inner cavity enters between the thrust surface 1132c and the end of the bearing 1412 through the water groove 15, thereby helping to lubricate the end of the bearing 1412, thereby helping to increase the service life of the bearing 1412. It should be noted that the axial direction of the electric pump here and below is the extension direction of the shaft of the electric pump, and the radial direction of the electric pump is the direction perpendicular to the axial direction of the electric pump.

[0037] As an implementation, see Figures 2 to 8As shown, the thrust portion 113 includes a support portion 1131 and a contact portion 1132, the contact portion 1132 is fixedly connected to the support portion 1131, and the thrust surface 1132c is formed on the end surface of the contact portion 1132. Specifically, the contact portion 1132 and the support portion 1131 can be split structural parts. It can be understood that the contact portion 1132 and the support portion 1131 are two separate parts, which are fixed by assembling parts. In this embodiment, the support portion 1131 and the pump housing 114 are an integrated structural part, and the part formed by the combination of the support portion 1131 and the pump housing 114 is the first part, which is fixedly connected to the contact portion 1132. In this way, it is more conducive to the processing and manufacturing of the electric pump 100 and to controlling the cost of the electric pump 100.

[0038] As an implementation, see Figures 2 to 8 As shown, the electric pump 100 includes a pump cover 11, and the pump cover 11 includes a pump housing 114. The pump housing 114 is fixedly connected to the support portion 1131, or the pump housing 114 and the support portion 1131 are an integrated structural member. In this embodiment, the pump housing 114 and the support portion 1131 are an integrated structural member. This is helpful in simplifying the manufacturing steps of the electric pump. It should be noted that the methods of fixed connection between the pump housing 114 and the support portion 1131 include but are not limited to welding fixation, adhesive fixation, clamping fixation and interference fit fixation.

[0039] As a specific implementation method, please refer to Figures 2 to 8 As shown, the contact portion 1132 is fixed to the support portion 1131 by injection molding, and the contact portion 1132 includes a fixed portion 1132a and a protruding portion 1132b. The fixed portion 1132a is fixed to the support portion 1131 by injection molding. Specifically, the fixed portion 1132a is embedded in the support portion 1131. It can be understood that at least part of the fixed portion 1132a is wrapped by the support portion 1131. The protruding portion 1132b extends from the support portion 1131 in a direction away from the support portion 1131. It can be understood that the part not wrapped by the support portion 1131 is the protruding portion 1132b; the thrust surface 1132c is formed on the protruding portion 1132b. Specifically, the water groove 15 is formed on the protruding portion 1132b. Specifically, the water groove 15 is concave from the end surface of the protruding portion 1132b. In this way, while realizing the reliable connection between the contact portion 1132 and the support portion 1131, it is beneficial to dissipate heat from the end of the bearing.

[0040] Please refer to 1 to Fig.13As shown, in order to further increase the wear resistance of the contact portion 1132, as an implementation method, the material of the contact portion 1132 is a ceramic material, the contact portion 1132 is formed by molding, and the water groove 15 is formed by molding. In this way, the water groove 15 is not formed by mechanical processing, so, first, it is beneficial to reduce the processing cost of the electric pump 100. Second, it is beneficial to improve the yield of the finished product of the contact portion 1132. Further, the wear resistance of the material of the bearing is less than the wear resistance of the material of the contact portion 1132. For example, the material of the bearing can be a graphite material, a plastic material, and a powder metallurgy material. In this way, the wear resistance of the material of the contact portion 1132 is higher than the wear resistance of the material of the bearing. In this way, during the operation of the electric pump, the wall corresponding to the water groove is less worn relative to the end of the bearing, so that it is beneficial to ensure the stability of the heat dissipation capacity of the bearing.

[0041] Please refer to Figures 2 to 4 As shown, when the electric pump 100 is working, in order to increase the fluidity of the working medium in the water trough 15 and improve the heat dissipation capacity of the bearing 1412, as an implementation method, the electric pump 100 includes a shaft 16, a rotor assembly 141 is sleeved on the shaft 16, and the pump cover 11 has an inner hole 18, one end of the inner hole 18 is connected to the water trough 15, and the other end of the inner hole 18 is connected to the inlet 111 of the pump cover 11. The heat dissipation path S1 formed in this way: the working medium of the inner cavity 13 → the water trough 15 → the inlet 111 of the pump cover 11. In this way, it is beneficial to dissipate heat for the bearing 1412, and then it is beneficial to increase the service life of the bearing 1412.

[0042] For further information, please refer to Figures 1 to 13As shown, as an implementation method, along the axial direction of the electric pump 100, the inner hole 18 extends from the thrust surface 1132c to the direction of the support portion 1131, and the inner hole 18 includes a mounting hole 181 and a return hole 182. The mounting hole 181 extends from the thrust surface 1132c2c to the direction of the support portion 1131, one end of the mounting hole 181 is connected to the water groove 15, and the other end of the mounting hole 181 is connected to the return hole 182. The electric pump 100 includes a shaft 16, a bearing sleeve is mounted on the shaft 16, a part of the shaft 16 is located in the mounting hole 181, and the part of the shaft 16 is limitedly matched with the wall corresponding to the mounting hole 181. In this way, specifically, the part of the shaft 16 is interference-fitted with the mounting hole 181. The electric pump 100 includes an inner groove 22, which is formed by being recessed from the wall corresponding to the mounting hole 181. The inner groove 22 can flow the working medium, and the wall corresponding to the inner groove 22 is partially formed on the support portion 1131 and partially formed on the fixed portion 1132a. Specifically, the fixed portion 1132a is embedded in the support portion 1131, and along the axial direction of the electric pump 100, the inner groove 22 extends from the wall corresponding to the mounting hole 181 to the support portion 1131. Further, along the radial direction of the electric pump 100, part of the inner groove 22 is recessed from the wall corresponding to the mounting hole and recessed to the contact portion 1132. It can be understood that the bottom wall of part of the inner groove 22 includes part of the contact portion 1132, which is conducive to improving the coaxiality of the shaft 16 and the stator assembly 12. The return hole 182 extends in the support portion 1131 along the axial direction of the electric pump 100 , and one end of the return hole 182 is communicated with the inlet 111 of the pump cover 11 .

[0043] As an implementation, see Figure 2 As shown, the electric pump 100 includes a reflux channel 17, which extends in the rotating assembly 14 in a direction parallel to the axial direction of the electric pump 100, and one end of the reflux channel 17 is in communication with the inner cavity 13, and the other end of the reflux channel 17 is in communication with the water trough 15. The working medium in the inner cavity 13 can enter the water trough 15 through the reflux channel 17, and then contact the end surface of the bearing 1412, so that it is beneficial to dissipate heat at the end of the bearing 1412, and then it is beneficial to increase the service life of the bearing 1412.

[0044] As a specific implementation method, please refer to Figures 1 to 13As shown, the inner cavity 13 includes a rotor cavity 131, and the rotor cavity 131 can flow the working medium. Part of the rotor assembly 141 is located in the rotor cavity 131. The electric pump 100 has a reflux channel 17. The working medium in the rotor cavity 131 can leave the rotor cavity 131 through the reflux channel 17. The rotor assembly 141 includes an injection molding part 1413. The injection molding part 1413 is formed by injection molding at least with the shaft 16 sleeve and the rotor 1411 as inserts, and the wall portion forming the reflux channel 17 is at least partially located in the injection molding part 1413. In this way, it is more conducive to heat dissipation of the bearing 1412 and at the same time improve the service life of the bearing 1412. Specifically, part of the wall portion corresponding to the reflux channel 17 is located in the injection molding part 1413, and the other part of the wall portion is located in the bearing 1412.

[0045] As an implementation, see Figures 1 to 4 as well as Figures 9 and 10 As shown, the rotating assembly 14 includes an impeller liquid inlet hole 143, and the impeller liquid inlet hole 143 is connected to the inlet 111 of the pump cover 11. The rotating assembly 14 includes an impeller assembly 142. Along the axial direction of the electric pump 100, the impeller assembly 142 extends from one end of the impeller assembly 142 to the direction of the rotor assembly 141. Part of the thrust portion 113 is located at the impeller liquid inlet hole 143. Along the radial direction of the electric pump 100, the thrust portion 113 and the wall corresponding to the impeller liquid inlet hole 143 are separated by a preset distance. In this way, the heat dissipation path S2 formed is: impeller liquid inlet hole 143→water trough 15→mounting hole 181→return hole 182→inlet 111 of the pump cover 11. In this way, it is beneficial to dissipate heat for the bearing, and then it is beneficial to improve the service life of the bearing. Further, the rotating assembly 14 has a rotating hole 144, and the mounting portion 162 is clearance-matched with the rotating hole 144. The rotating hole 144 is connected to the impeller liquid inlet hole 143. The working medium in the inner cavity 13 will also enter the mounting hole 162 through the gap between the mounting portion 162 and the wall portion corresponding to the rotating hole 144, thereby lubricating the inner hole of the bearing, which is beneficial to improving the service life of the bearing.

[0046] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. An electric pump (100), characterized in that: The electric pump (100) comprises a rotating assembly (14) and a thrust portion (113). The rotating assembly (14) comprises a bearing (1412) and a rotor (1411). The bearing (1412) is fixedly connected to the rotor (1411). Along the axial direction of the electric pump (100), the thrust portion (113) is arranged on one side of the bearing (1412). The thrust portion (113) comprises a thrust surface (1132c). The electric pump has a water groove (15). The water groove (15) is recessed in the thrust surface (1132c). During the operation of the electric pump (100), the end surface of the bearing (1412) contacts the thrust surface (1132c). The electric pump (100) comprises an inner cavity (13). The water groove (15) is connected to the inner cavity (13).

2. The electric pump (100) according to claim 1, characterized in that: The thrust portion (113) comprises a supporting portion (1131) and a contact portion (1132), the contact portion (1132) is fixedly connected to the supporting portion (1131), and the thrust surface (1132c) is formed on an end surface of the contact portion (1132).

3. The electric pump (100) according to claim 2, characterized in that: The contact portion (1132) is fixed to the support portion (1131) by injection molding, and the contact portion (1132) includes a fixed portion (1132a) and a protruding portion (1132b). The fixed portion (1132a) is fixed to the support portion (1131) by injection molding, and the protruding portion (1132b) extends from the support portion (1131) in a direction away from the support portion (1131), and the thrust surface (1132c) is formed on the protruding portion (1132b).

4. The electric pump (100) according to any one of claims 1 to 3, characterized in that: The electric pump (100) comprises a shaft (16), the rotating assembly (14) is sleeved on the shaft (16), and the electric pump (100) comprises a pump cover (11), the pump cover (11) has an inner hole (18), one end of the inner hole (18) is connected to the water trough (15), and the other end of the inner hole (18) is connected to the inlet (111) of the pump cover (11).

5. The electric pump (100) according to claim 4, characterized in that: The thrust portion (113) includes a support portion (1131). Along the axial direction of the electric pump (100), the inner hole (18) extends from the thrust surface (1132c) toward the support portion (1131). The inner hole (18) includes a mounting hole (181) and a return hole (182). The mounting hole (181) extends from the thrust surface (1132c) toward the support portion (1131). One end of the mounting hole (181) is connected to the water trough (15), and the other end of the mounting hole (181) is connected to the return hole (182). Along the axial direction of the electric pump (100), the return hole (182) extends inside the support portion (1131), and the return hole (182) is connected to the inlet (111) of the pump cover (11).

6. The electric pump (100) according to any one of claims 1 to 5, characterized in that: The electric pump (100) comprises a reflux channel (17), which extends in the rotating assembly (14) in a direction parallel to the axial direction of the electric pump (100), one end of the reflux channel (17) is connected to the inner cavity (13), and the other end of the reflux channel (17) is connected to the water trough (15).

7. The electric pump (100) according to claim 6, characterized in that: The inner cavity (13) includes a rotor cavity (131), and the rotor cavity (131) can flow a working medium. The electric pump (100) includes a rotor assembly (141), and a portion of the rotor assembly (141) is located in the rotor cavity (131). The electric pump (100) has a return channel (17), and the working medium in the rotor cavity (131) can leave the rotor cavity (131) through the return channel (17). The rotor assembly (141) includes an injection molding portion (1413), and the injection molding portion (1413) is formed by injection molding with at least the bearing (1412) and the rotor (1411) as inserts, and a wall portion forming the return channel (17) is at least partially located in the injection molding portion (1413).

8. The electric pump (100) according to claim 6 or 7, characterized in that: The electric pump (100) comprises a rotor assembly (141), the inner cavity (13) comprises an impeller cavity (132), the rotating assembly (14) comprises an impeller liquid inlet hole (143), the impeller liquid inlet hole (143) is communicated with the impeller cavity (132), the rotating assembly (14) comprises an impeller assembly (142), along the axial direction of the electric pump, the impeller liquid inlet hole (143) extends from one end of the impeller assembly (142) toward the rotor assembly (141), part of the thrust portion (113) is located in the impeller liquid inlet hole (143), and along the radial direction of the electric pump (100), the thrust portion (113) and the wall portion corresponding to the impeller liquid inlet hole (143) are spaced apart by a preset distance.

9. The electric pump (100) according to any one of claims 1 to 8, characterized in that: The thrust portion (113) comprises a contact portion (1132), the material of the contact portion (1132) is a ceramic material, the contact portion (1132) is formed by molding, and the water channel (15) is formed by molding.

10. The electric pump (100) according to claim 9, characterized in that: The electric pump (100) comprises a stator assembly (12), wherein the stator assembly (12) comprises a stator winding (122) and a stator housing (121), wherein the stator housing (121) is formed by at least injection molding with the stator winding (122) as an insert, and the other end of the shaft (16) is fixed to the stator housing (121) by injection molding.

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