Electric pump

Abstract

The invention discloses an electric pump which comprises a stator assembly, the stator assembly comprises a stator winding and a stator shell, the stator shell is formed by at least taking the stator winding as an insert in an injection molding mode, the stator shell is provided with an inflow channel, the inflow channel is located on the outer side of the stator winding in the radial direction of the electric pump, and the wall forming the inflow channel is located on the stator shell. In the circumferential direction of the electric pump, the inflow channel is arranged in the circumferential direction of the stator winding by a circle, and the inflow channel can flow or store a working medium. In this way, heat dissipation of the stator assembly is facilitated.

Description

Technical Field

[0001] This application relates to the field of fluid control, and particularly to an electric pump.

Background Art

[0002] The electric pump includes a stator assembly. During the operation of the electric pump, the stator assembly generates a certain amount of heat, and currently, the heat dissipation efficiency of the stator assembly is relatively low.

Summary of the Invention

[0003] The purpose of the present invention is to provide an electric pump, which is beneficial to improving the heat dissipation efficiency of the stator assembly.

[0004] To achieve the above purpose, an embodiment provided in this application adopts the following technical solution: An electric pump includes a stator assembly. The stator assembly includes a stator winding and a stator housing. The stator housing is at least injection-molded with the stator winding as an insert. The stator housing has an inlet flow channel. Along the radial direction of the electric pump, the inlet flow channel is located outside the stator winding, and the wall forming the inlet flow channel is located on the stator housing. Along the circumferential direction of the electric pump, the inlet flow channel is arranged in a circle around the stator winding in the circumferential direction, and the inlet flow channel can flow or store the working medium.

[0005] In an embodiment of this application, the wall forming the inlet flow channel is located on the stator housing. Along the circumferential direction of the electric pump, the inlet flow channel is arranged in a circle around the stator winding in the circumferential direction, and the inlet flow channel can flow or store the working medium. In this way, it is beneficial to increase the heat dissipation area of the stator winding, and further, it is beneficial to improve the heat dissipation efficiency of the stator assembly.

Description of the Drawings

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

[0007] Figure 2 is Figure 1 the exploded structural schematic diagram of the first embodiment of the electric pump in

[0008] Figure 3 is Figure 1 the sectional structural schematic diagram along X-X of the first embodiment of the electric pump in

[0009] Figure 4 is Figure 1 the three-dimensional structural schematic diagram of the first embodiment of the stator winding in

[0010] Figure 5 is Figure 1 the three-dimensional structural schematic diagram of the first embodiment of the first component in

[0011] Figure 6 is Figure 1Schematic perspective structure diagram of the first embodiment of the middle stator assembly;

[0012] Figure 7 is Figure 6 Schematic sectional structure diagram along the Y-Y section in the middle;

[0013] Figure 8 is Figure 6 Schematic enlarged structure diagram I in the middle;

[0014] Figure 9 is Figure 1 Schematic perspective structure diagram of the second embodiment of the middle stator assembly;

[0015] Figure 10 is Figure 9 Schematic enlarged structure diagram II in the middle;

[0016] Figure 11 is Figure 9 Schematic sectional structure diagram along the A-A section of the first embodiment in the middle;

[0017] Figure 12 is Figure 9 Schematic sectional structure diagram along the A-A section of the second embodiment in the middle;

[0018] Figure 13 is Figure 6 and Figure 9 Schematic perspective structure diagram of the first embodiment of the second housing in the middle;

[0019] Figure 14 Schematic position relationship structure diagram of the first port and the second port;

[0020] Figure 15 is Figure 14 Schematic enlarged structure diagram III in the middle;

[0021] Figure 16 is Figure 1 Schematic sectional structure diagram along the X-X section of the second embodiment of the electric pump in the middle;

[0022] Figure 17 is Figure 1 Schematic sectional structure diagram along the X-X section of the third embodiment of the electric pump in the middle;

[0023] Figure 18 is Figure 3 Schematic enlarged structure diagram IV in the middle;

[0024] In the drawings: 100, electric pump;

[0025] 11, pump cover; 111, inlet; 112, outlet;

[0026] 12. Stator assembly; 121. Stator housing; 1211. First housing; 1212. Second housing; 1212a. Cylindrical portion; 1212b. Radially extending portion; 1212c. Outer peripheral side wall portion; 1212d. Bottom; 1212e. Outer wall portion; 1212f. Inner wall portion;

[0027] 122. Stator winding; 1221. Stator core; 1222. Insulating skeleton; 1223. Winding; 13. Partition; 14. Inner cavity; 141. Rotor cavity; 142. Impeller cavity; 15. Rotating assembly; 151. Rotor assembly; 152. Impeller assembly; 16. Connecting cavity; 17. Through channel; 18. Shaft; 181. Fixed portion; 182. Extended portion; 1811. First end; 19. Heat conducting portion; 20. Return channel;

[0028] 21. End cover; 22. Control board assembly; 23. Inlet flow channel; 231. First wall portion; 232. Second wall portion; 233. First port; 234. Second port; 25. First assembly; 251. Upper end portion; 252. Lower end portion; 253. Inner side portion; 254. Outer side portion; 26. Bottom case; 261. Support portion; 2611. First sub-portion; 2612. Second sub-portion; 27. Conductive portion; 271. Conductive member; 28. Control cavity; 29. Rib portion; 291. First sub-rib portion; 292. Second sub-rib portion; S1. First heat dissipation path;

[0029] S2. Second heat dissipation path; 101. First reference plane; 102. Projected contour area of the first port; 103. Projected contour area of the second port 103.

Detailed implementation manners

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0031] The following further details the specific implementation manners of the present application with reference to the accompanying drawings. First of all, it should be noted that the orientation terms such as up, down, left, right, front, back, inner, outer, top, bottom, etc. mentioned or possibly mentioned in the specification of the present invention are defined relative to the structures shown in the corresponding drawings. They are relative concepts and may therefore change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0032] The electric pump in the following embodiments can provide flowing power for the working medium of the vehicle thermal management system. The working medium can be water or an aqueous solution, such as an aqueous solution including 50% ethylene glycol. Of course, the working medium can also be other substances.

[0033] See Figures 1 to 18As shown in the figure, the present application provides an electric pump 100, which includes a pump cover 11, a stator assembly 12, a partition 13, a rotating assembly 15, and a shaft 18; 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 skeleton 1222, and a winding 1223. The pump cover 11 is hermetically and fixedly connected to the stator assembly 12. It should be noted that the hermetic fixation here means that when the electric pump 100 is working, the working medium inside 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 18 is fixedly connected to the stator assembly 12. Specifically, the shaft 18 is injection-molded and fixed to the stator housing 121. It can be understood that a part of the shaft 18 is embedded in the stator housing 121. Specifically, the shaft 18 includes a fixing portion 181, and the fixing portion 181 is embedded in the stator housing 121. The electric pump 100 has an inner cavity 14, and the rotating assembly 15 is located in the inner cavity 14. The inner cavity 14 includes a rotor cavity 141 and an impeller cavity 142, and the rotor cavity 141 and the impeller cavity 142 are connected. The inner cavity 14 can have the working medium flowing through. The rotating assembly 15 includes a rotor assembly 151 and an impeller assembly 152, and the rotor assembly 151 includes a permanent magnet. At least a part of the rotor assembly 151 is located in the rotor cavity 141, and the impeller assembly 152 is located in the impeller cavity 142. In a specific embodiment, at least a part of the other end of the shaft 18 is located in the rotor cavity 141, at least a part of the rotating assembly 15 is sleeved on the outer periphery of the shaft 18, and a part of the shaft 18 is fixed to the stator housing 121, and the rotating assembly 15 can rotate around the shaft 18. Of course, as another implementation manner, the rotating assembly 15 and the shaft 18 are fixedly connected, and the shaft 18 rotates together with the rotating assembly 15. The electric pump 100 may further include a control board assembly 22, and the control board assembly 22 is electrically connected to the stator assembly 12. Specifically, the electric pump includes a conductive portion 27, and the conductive portion 27 includes a conductive member 271. The control board assembly 22 is electrically connected to the stator assembly 12 through the conductive member 271. Of course, as another implementation manner, the electric pump 100 may not include the pump cover 11, and the pump cover 11 is integrated on an external structure. Such a setting is more conducive to the integrated design of the electric pump 100, making the structure of the electric pump 100 more compact, and more conducive to the miniaturization and light weight of the structure of the electric pump 100. 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 current of the stator winding 122 is controlled to control the excitation magnetic field generated by the stator winding 122. The rotating assembly 15 rotates around the shaft 18 under the action of the excitation magnetic field, so that the working medium entering the inner cavity 14 through the inlet 111 makes a rotational motion along with the rotating assembly 15, and the working medium will leave the electric pump 100 through the outlet 112 under the action of centrifugal force.

[0034] SeeFigure 4 As shown, the stator winding 122 includes a stator core 1221, an insulating skeleton 1222, and windings 1223. The number of windings 1223 is at least three. The insulating skeleton 1222 covers at least part of the surface of the stator core 1221. The insulating skeleton 1222 is used to isolate the windings 1223 from the stator core 1221, so that the windings 1223 and the stator core 1221 are electrically insulated. The insulating skeleton 1222 and the stator core 1221 can be an integral structural member. Specifically, as an implementation manner, the insulating skeleton 1222 is formed by insert molding with the stator core 1221 as an insert. Of course, as other implementation manners, the insulating skeleton 1222 and the stator core 1221 are separately arranged. Here, "separately arranged" means that the insulating skeleton 1222 and the stator core 1221 are respectively processed into two separate parts and then assembled. They are connected in a limiting manner or a fixed connection manner through assembly. In this embodiment, the insulating skeleton 1222 is formed by insert molding with the stator core 1221 as an insert. It can be understood that the stator core 1221 and the insulating skeleton 1222 are an integral structure. The windings 1223 are wound around the insulating skeleton 1222. As a specific embodiment, the windings 1223 include nine windings. Of course, as other implementation manners, the windings 1223 can also include other numbers of windings, such as three or six or twelve or other numbers.

[0035] When the electric pump is working, the stator winding will generate a certain amount of heat. If this part of the heat cannot be discharged in time, it will affect the performance of the electric pump. Especially for high-power electric pumps, quickly dissipating heat from the stator assembly is a technical problem faced by those skilled in the art. As an implementation manner, please refer to Figures 1 to 12 As 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 molding with the stator winding 122 as an insert. The stator housing 121 has an inlet flow channel 23. Along the radial direction of the electric pump 100, the inlet flow channel 23 is located outside the stator winding 122. The wall forming the inlet flow channel 23 is located in the stator housing 121. Along the circumferential direction of the electric pump 100, the inlet flow channel 23 is arranged in a circle around the stator winding 122. The inlet flow channel 23 can flow or store the working medium. Figures 6 to 8It shows an implementation where the inflow channel 23 is arranged around the stator winding. In this way, it is beneficial to increase the heat dissipation area of the stator winding, and further, it is beneficial to improve the heat dissipation efficiency of the stator assembly. The stator housing 121 has an inflow channel 23, that is to say, the inflow channel 23 is arranged in the stator housing 121, that is, the injection molded body. Subsequently, the inflow channel 23 can be formed by injection molding or by machining. Compared with the way of forming the inflow channel 23 by assembly, the number of components is reduced, which is beneficial to simplify the manufacturing steps of the electric pump and lay a certain foundation for reducing the production cost of the electric pump 100. It should be noted that the working medium in the inflow channel 23 can be the same as or different from the working medium flowing in the above-mentioned automotive thermal management system. For example, the working medium stored or flowing in the inflow channel 23 is oil. In this embodiment, the working medium in the inflow channel 23 is the same as the working medium flowing in the above-mentioned thermal management system, such as water or aqueous solution.

[0036] Generally speaking, as an injection molded body, the structural strength of the injection molded body is weak. To strengthen the injection molded body, that is, to strengthen the structural strength of the stator housing, as an implementation method, please refer to Figures 1 to 11 As shown, the electric pump 100 includes a rib portion 29. Along the axial direction of the electric pump 100, the rib portion 29 extends in the inflow channel 23. The wall portion corresponding to the inflow channel 23 includes a first wall portion 231 and a second wall portion 232. Along the radial direction of the electric pump 100, the first wall portion 231 is relatively farther from the stator winding 122 than the second wall portion 232. One end of the rib portion 29 is connected to the first wall portion 231, and the other end of the rib portion 29 is connected to the second wall portion 232. In this way, while satisfying the heat dissipation of the stator assembly, it is beneficial to improve the structural strength of the stator housing.

[0037] Furthermore, please refer to Figures 1 to 11 As shown, there are multiple rib portions 29. The stator housing 121 includes a bottom portion 1212d and a radially extending portion 1212b. The bottom portion 1212, the bottom portion 1212d covers one end of the stator winding 122, and the radially extending portion 1212b covers the other end of the stator winding 122. The electric pump 100 includes a rotor cavity 141. The wall portion corresponding to the rotor cavity 141 includes a part of the bottom portion 1212d. There are multiple rib portions 29. Along the axial direction of the electric pump 100, multiple rib portions 29 all extend from the radially extending portion 1212b towards the bottom portion 1212d; multiple rib portions 29 are connected to one end of the bottom portion 1212d; by arranging multiple rib portions, while satisfying the heat dissipation of the stator assembly, the structural strength of the stator housing is further improved.

[0038] Or, as another implementation method, please refer to Figures 1 to 10 And Figure 12As shown in the figure, one of the rib portions 29 is defined as the first sub-rib portion 291, and the second sub-rib portion 292 is adjacent to the first sub-rib portion 291 in the axial direction. Along the axial direction of the electric pump, a preset gap is provided between the first sub-rib portion 291 and the second sub-rib portion 292. Through such a setting, it is beneficial to improve the heat transfer coefficient between the working medium and the wall of the inlet flow channel 23, and while ensuring the structural strength of the stator housing, it is beneficial to improve the heat dissipation efficiency of the stator assembly. To further improve the heat transfer coefficient between the working medium and the wall of the inlet flow channel 23, along the circumferential direction of the electric pump 100, a preset angle is provided between the first sub-rib portion 291 and the second sub-rib portion 292.

[0039] As an implementation method, please refer to Figures 1 to 18 As shown in the figure, the stator housing 121 includes a first housing 1211 and a second housing 1212. The first housing 1211 is at least injection-molded with the stator winding 122 as an insert, and the first assembly 25 is defined. The first assembly 25 includes the stator winding 122 and the first housing 1211. The second housing 1212 is at least injection-molded with the first assembly 25 as an insert. The electric pump 100 includes an inlet flow channel 23. Along the radial direction of the electric pump 100, the inlet flow channel 23 is located radially outside the first assembly 25, and at least part of the wall forming the inlet flow channel 23 is located in the second housing 1212. Along the circumferential direction of the electric pump 100, the inlet flow channel 23 is arranged in a circle around the first assembly 25. In this way, it is more beneficial to dissipate heat from the winding part of the outer side close to the stator winding 122.

[0040] As an implementation method, please refer to Figures 1 to 3 As shown in the figure, the second housing 1212 is injection-molded with the first assembly 25 and the shaft 18 as inserts. The second housing 1212 has a partial inner cavity 14. Specifically, the second housing 1212 forms a rotor cavity 141. The shaft 18 includes a fixed part 181 and an extending part 182. The fixed part 181 is injection-fixed with the second housing 1212, and the extending part 182 extends along the axial direction of the electric pump 100 in the inner cavity 14. Specifically, the extending part 182 extends in the rotor cavity 141. The rotating assembly 15 is in clearance fit with the extending part 182, that is to say, the rotating assembly 15 can rotate around the extending part 182. The insert forming the second housing 1212 includes the shaft 18. In this way, the second housing 1212 has a rotor cavity 141, that is to say, the wall corresponding to the formation of the rotor cavity 141 is formed during the second injection molding, which is beneficial to reducing the joint surface between the first injection molding and the second injection molding, and further beneficial to reducing the risk of leakage of the electric pump through the above joint surface. Further, the fixed part 181 includes a first end part 1811, and the first end part 1811 is completely embedded in the second housing 1212, that is to say, the second housing 1212 wraps the first end part 1811. In this way, further, the risk of leakage of the working medium through the wall corresponding to the rotor cavity 141 is reduced.

[0041] As an implementation manner, please refer to Figures 1 to 9 As shown, the second housing 1212 includes an outer peripheral side wall portion 1212c. Along the radial direction of the electric pump 100, the outer peripheral side wall portion 1212c is radially outside the outer side portion 254 of the first assembly 25. Along the axial direction of the electric pump 100, a part of the inflow channel 23 extends within the outer peripheral side wall portion 1212c. In this way, arranging the inflow channel on the second housing is beneficial to simplifying the injection mold. Further, the second housing 1212 includes a cylindrical portion 1212a, a radially extending portion 1212b, an outer peripheral side wall portion 1212c, and a bottom portion 1212d. Along the axial direction of the electric pump 100, the radially extending portion 1212b is located on one side of the cylindrical portion 1212a. Specifically, the radially extending portion 1212b covers the upper end portion 251 of the first assembly 25. The bottom portion 1212d is located on the other side of the cylindrical portion 1212a, and the bottom portion 1212d covers a part of the lower end portion 252 of the first assembly 25. Along the radial direction of the electric pump 100, the outer peripheral side wall portion 1212c is radially outside the outer side portion 254 of the first assembly 25, and the cylindrical portion 1212a is radially inside the inner side portion 253 of the first assembly 25. Along the axial direction of the electric pump 100, a part of the inflow channel 23 extends within the outer peripheral side wall portion 1212c. The wall portion corresponding to the rotor cavity 141 includes the cylindrical portion 1212a and a part of the bottom portion 1212d. At least a part of the rotor assembly 151 is located in the rotor cavity 141. The rotor cavity 141 and the impeller cavity 142 are communicated to allow the working medium to flow through. Along the radial direction of the electric pump 100, the rotor cavity 141 is located radially inside the first assembly 25. The wall portion corresponding to the impeller cavity 142 includes the radially extending portion 1212b. In this way, the upper end portion 251, the inner side portion 253, and the outer side portion 254 of the first assembly 25 will be covered by a part of the working medium flow path. The flow of the working medium is beneficial to taking the heat generated by the stator winding 122 away to the outside of the electric pump 100. In this way, it is beneficial to increase the heat dissipation area of the stator winding 122, and further beneficial to the heat dissipation efficiency of the stator assembly 12.

[0042] To balance the output efficiency of the electric pump and the heat dissipation efficiency of the stator assembly, that is, while meeting the heat dissipation of the stator assembly, the output efficiency of the electric pump also meets the requirements. As an implementation manner, please refer to Figures 1 to 18As shown, the inflow channel 23 includes a first port 233 and a second port 234. The wall forming the second port 234 is at least located at the radially extending portion 1212b, and the wall forming the second port 235 is at the bottom 1212d. A first reference plane 101 is defined, and the first reference plane 101 is parallel to the plane where the bottom 1212d is located. The walls forming the first port 233 and the wall forming the second port 234 are orthogonally projected onto the first reference plane 101. The projected contour line of the second port 234 is within the projected contour line of the wall of the first port 233, and the area 102 of the projected contour line of the second port 234 is smaller than the area 103 of the projected contour of the first port 233. In this way, it is beneficial to balance the output efficiency of the electric pump and the heat dissipation efficiency of the stator assembly.

[0043] To simplify the structure of the electric pump 100, the working medium flowing into the inflow channel 23 can flow in through the working medium in the impeller cavity 142 of the electric pump 100. As an implementation, please refer to Figures 1 to 18 As shown, the electric pump has an inner cavity, the inner cavity 14 includes an impeller cavity 142, the electric pump 100 includes a rotating assembly 15, the rotating assembly 15 includes an impeller assembly 152, the impeller assembly 152 is located in the impeller cavity 142, and the impeller cavity 142 communicates with the inflow channel 23. Specifically, the impeller cavity 142 communicates with the inflow channel 23 through the first port 234. In this way, while dissipating heat from the stator winding 122, it is beneficial to simplify the structure of the electric pump 100. In the above implementation, the impeller cavity 142 can communicate with the rotor cavity 141 or not. In this embodiment, the impeller cavity 142 and the rotor cavity 141 are communicated.

[0044] Please refer to Figures 1 to 18 As shown, to increase the heat dissipation area of the stator winding 122, as an implementation, the electric pump 100 includes a communication cavity 23, the electric pump 100 includes a partition 13, the stator housing 121 includes a bottom 1212h, the partition 13 is fixedly sealed with the bottom, the wall portion corresponding to the communication cavity 23 includes a part of the bottom 1212d and a part of the partition 13, and the other end of the inflow channel 23 communicates with one end of the communication cavity 16. Specifically, the other end of the inflow channel 23 communicates with the communication cavity 16 through the second port 234. In this way, it is beneficial to increase the heat dissipation area of the stator winding 122.

[0045] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figure 1 、 Figure 2 and Figure 16As shown, as an implementation, the inner cavity 14 includes a rotor cavity 141. The rotor cavity 141 communicates with the impeller cavity 142. The electric pump 100 has a through-channel 17. Along the axial direction of the electric pump 100, the through-channel 17 penetrates the bottom 1212d. One end of the through-channel 17 communicates with the rotor cavity 141, and the other end of the through-channel 17 communicates with the communication cavity 16. In this way, the flow of the working medium in the inlet channel 23 can be accelerated, and the circulation of the working medium in the inlet channel 23 and the communication cavity 16 can be accelerated, which is conducive to accelerating the heat dissipation rate of the stator winding 122. Define the heat dissipation path here as the first heat dissipation path S1, and the flow direction of the working medium of the first heat dissipation path S1 is impeller cavity 142 -> inlet channel 23 -> communication cavity 16 -> through-channel 17 -> rotor cavity 141.

[0046] To further accelerate the heat dissipation of the stator assembly 12, please refer to Figure 1 、 Figure 2 and Figure 17 As shown, as an implementation, the electric pump 100 includes a return channel 20. The electric pump 100 includes a rotor assembly 151. The rotor assembly 151 is fixedly connected to the impeller assembly 152. Specifically, the rotor assembly 151 and the impeller assembly 152 are injection-molded and fixed. At least part of the rotor assembly 151 is located in the rotor cavity 141, and at least part of the return channel 20 is arranged on the rotor assembly 151. The electric pump 100 has an inlet 111 for the inflow of the working medium. One end of the return channel 20 communicates with the rotor cavity 141, and the other end of the return channel 20 communicates with the inlet 111. In this way, the working medium in the inlet channel 23 and the communication cavity 16 can enter the rotor cavity 141, and the working medium in the rotor cavity 141 can enter the inlet 111 through the return channel 20. Define the heat dissipation path here as the second heat dissipation path S2, and the flow direction of the working medium of the second heat dissipation path S2 is impeller cavity 142 -> inlet channel 23 -> communication cavity 16 -> through-channel 17 -> rotor cavity 141 -> return channel 20 -> inlet 111; First, due to the greater pressure difference between the impeller cavity 142 and the inlet 111, the flow velocity of the working medium in the second heat dissipation path S2 is faster, accelerating the heat dissipation efficiency of the stator assembly 12. Second, it can be seen that in this implementation, there are both the first heat dissipation path S1 and the second heat dissipation path S2. The increase of the heat dissipation path can also improve the heat dissipation efficiency of the stator assembly 12.

[0047] As an implementation, please refer to Figures 1 to 18 As shown, the electric pump 100 includes a control board assembly 12. The control board assembly 22 is electrically connected to the stator winding 122. The control board assembly 22 is in direct contact with the partition 13 or a heat-conducting part 19 is filled between the control board assembly 22 and the partition 13. Figure 3Only the embodiment in which the heat-conducting part 19 is filled between the control board assembly 22 and the partition part 13 is shown, and the embodiment in which the control board assembly 22 is in direct contact with the partition part 13 is not shown. Specifically, the heat-conducting part 19 includes heat-conducting silica gel or heat-conducting silicone grease. In this way, it is beneficial to dissipate heat from the control board assembly 22, thereby improving the service life of the electric pump. In this embodiment, the electric pump 100 includes an end cover 21, and the end cover 21 is fixedly connected to the bottom case 26. Specifically, the end cover 21 is fixedly connected to the bottom case 26 by welding, and the welding methods include but are not limited to infrared welding, rotary friction welding, laser welding, and ultrasonic welding. The electric pump 100 includes a control cavity, and the wall part corresponding to the control cavity includes an end cover and a bottom case, and the control board assembly 22 is located in the control cavity 28. In this way, the control cavity 28 and the stator cavity 24 are not communicated, so that it is beneficial to reduce the heat generated by the stator winding 122 from being transferred to the control board assembly 22 in the control cavity 28, and it is beneficial to improve the service life of the control board assembly 22.

[0048] It should be noted that the above embodiments are only used to illustrate the present application and do not limit the technical solutions described in the present application. Although this specification has described the present application in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present application or make equivalent substitutions, and all technical solutions and their improvements that do not depart from the spirit and scope of the present application should be covered by the scope of the claims of the present application.

Claims

1. An electric pump (100), characterized in that: The electric pump (100) includes a stator assembly (12), and the stator assembly (12) includes a stator winding (122) and a stator housing (121). The stator housing (121) is injection-molded at least with the stator winding (122) as an insert. The stator housing (121) has an inlet flow channel (23). Along the radial direction of the electric pump (100), the inlet flow channel (23) is located outside the stator winding (122), and the wall forming the inlet flow channel (23) is located on the stator housing (121). Along the circumferential direction of the electric pump (100), the inlet flow channel (23) is arranged in a circumferential circle around the stator winding (122), and the inlet flow channel (23) can flow or store the working medium.

2. The electric pump (100) according to claim 1, characterized in that: The electric pump (100) includes a rib portion (29). Along the axial direction of the electric pump (100), the rib portion (29) extends in the inlet flow channel (23). The wall portion corresponding to the inlet flow channel (23) includes a first wall portion (231) and a second wall portion (232). Along the radial direction of the electric pump (100), the first wall portion (231) is farther from the stator winding (122) than the second wall portion (232). One end of the rib portion (29) is connected to the first wall portion (231), and the other end of the rib portion (29) is connected to the second wall portion (232).

3. The electric pump (100) according to claim 2, characterized in that: There are multiple rib portions (29). The stator housing (121) includes a bottom portion (1212d) and a radially extending portion (1212b). The bottom portion (1212d) covers one end of the stator winding (122), and the radially extending portion (1212b) covers the other end of the stator winding (122). The electric pump (100) includes a rotor cavity (141). The wall portion corresponding to the rotor cavity (141) includes a part of the bottom portion (1212d). There are multiple rib portions (29). Along the axial direction of the electric pump (100), the multiple rib portions (29) all extend from the radially extending portion (1212b) towards the bottom portion (1212d); One ends of the multiple rib portions (29) are connected to the bottom portion (1212d); Alternatively, one of the rib portions (29) is defined as a first sub-rib portion (291), and the one adjacent to the first sub-rib portion (291) in the axial direction is a second sub-rib portion (292). Along the axial direction of the electric pump, a preset gap is provided between the first sub-rib portion (291) and the second sub-rib portion (292).

4. The electric pump (100) according to any one of claims 1 to 3, characterized in that: The stator housing (121) includes a first housing (1211) and a second housing (1212). The first housing (1211) is injection-molded with at least the stator winding (122) as an insert, defining a first assembly (25). The first assembly (25) includes the stator winding (122) and the first housing (1211). The second housing (1212) is injection-molded with at least the first assembly (25) as an insert. The electric pump (100) includes an inlet passage (23). Along the radial direction of the electric pump (100), the inlet passage (23) is located radially outside the first assembly (25). At least part of the wall forming the inlet passage (23) is located in the second housing (1212). Along the circumferential direction of the electric pump (100), the inlet passage (23) is arranged to surround the first assembly (25) in a circumferential circle.

5. The electric pump (100) according to claim 4, characterized in that: The second housing (1212) includes an outer peripheral side wall portion (1212c). Along the radial direction of the electric pump (100), the outer peripheral side wall portion (1212c) is located radially outside the outer side portion (254) of the first assembly (25). Along the axial direction of the electric pump (100), part of the inlet passage (23) extends within the outer peripheral side wall portion (1212c).

6. The electric pump (100) according to any one of claims 3 to 5, characterized in that: The inlet passage (23) includes a first port (233) and a second port (234). The wall forming the first port (233) is at least located in the radially extending portion (1212b). The wall forming the second port (234) is located at the bottom (1212d). A first reference plane (101) is defined. The first reference plane (101) is parallel to the plane where the bottom (1212d) is located. Project the wall forming the first port (233) and the wall forming the second port (234) onto the first reference plane (101). The projected contour line of the second port (234) is located within the projected contour line (102) of the wall of the first port (233), and the area of the projected contour line of the second port (234) is smaller than the area of the projected contour of the first port (233) (103).

7. The electric pump (100) according to any one of claims 1 to 6, characterized in that: The electric pump (100) has an inner cavity (14). The inner cavity (14) includes an impeller cavity (142). The electric pump (100) includes a rotating assembly (15). The rotating assembly (15) includes an impeller assembly (152). The impeller assembly (152) is located in the impeller cavity (142). One end of the inlet passage (23) is communicated with the impeller cavity (142).

8. The electric pump (100) according to claim 7, characterized in that: The electric pump (100) includes a communication cavity (23). The electric pump (100) includes a partition (13). The stator housing (121) includes a bottom (1212d). The partition (13) is hermetically fixed to the bottom (1212d). The wall portion corresponding to the communication cavity (23) includes part of the bottom (1212d) and part of the partition (13). The other end of the inlet passage (23) is communicated with one end of the communication cavity (23) through the second port (235).

9. The electric pump (100) according to claim 8, characterized in that: The inner cavity (14) includes a rotor cavity (141), the rotor cavity (141) communicates with the impeller cavity (142), the electric pump (100) has a through-channel (17), along the axial direction of the electric pump (100), the through-channel (17) penetrates through the bottom (1212d), one end of the through-channel (17) communicates with the rotor cavity (141), and the other end of the through-channel (17) communicates with the communication cavity (23).

10. The electric pump (100) according to any one of claims 1 to 9, characterized in that: The electric pump (100) includes a reflux channel (20), the electric pump (100) includes a rotor assembly (151), the rotor assembly (151) is fixedly connected to the impeller assembly (152), at least part of the rotor assembly (151) is located in the rotor cavity (141), at least part of the reflux channel (20) is arranged on the rotor assembly (151), the electric pump (100) has an inlet (111), one end of the reflux channel (20) communicates with the rotor cavity (141), and the other end of the reflux channel (20) communicates with the inlet (111).

11. The electric pump (100) according to any one of claims 1 to 10, characterized in that: The electric pump (100) includes a control board assembly (22), the control board assembly (22) is electrically connected to the stator winding (122), the electric pump (100) includes a partition (13), the stator housing (121) includes a bottom (1212d), the partition (13) is hermetically fixed to the bottom (1212d), the control board assembly (22) is in direct contact with the partition (13) or a heat-conducting part (19) is filled between the control board assembly (22) and the partition (13).

Images