CN117189684A

CN117189684A - Electric pump

Info

Publication number: CN117189684A
Application number: CN202210612432.2A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2023-12-08

Abstract

The application discloses an electric pump, which comprises a pump housing and a control panel assembly, wherein the electric pump comprises a second cavity, the control panel assembly comprises electronic components, the side wall corresponding to the second cavity comprises at least part of the outer side wall surface of the electronic components and at least part of the inner side wall surface of the pump housing, the electric pump comprises heat conducting liquid, at least part of the heat conducting liquid is positioned in the second cavity, at least part of the electronic components are in contact with the heat conducting liquid, at least part of the material of the pump housing is heat conducting material, the heat conducting material is defined as a contact part, and at least part of the contact part is in contact with the heat conducting liquid. In this way, the heat dissipation of the control board assembly is facilitated.

Description

Electric pump

[ field of technology ]

The application relates to a fluid pump, in particular to an electric pump.

[ background Art ]

The electric pump comprises a control panel assembly, heat can be generated when the control panel assembly works, the heat can not be accumulated to a certain extent and can not be timely dissipated, the performance of the control panel assembly can be affected, and accordingly the service life of the electric pump is shortened, and therefore, how to effectively dissipate the heat of the control panel assembly is a technical problem.

[ application ]

The application aims to provide an electric pump which is beneficial to heat dissipation of a control panel assembly.

In order to achieve the above object, an embodiment of the present application adopts the following technical scheme: the utility model provides an electric pump, including pump housing and control panel subassembly, the electric pump includes the second chamber, the control panel subassembly includes electronic components, the lateral wall that the second chamber corresponds includes the lateral wall face of at least some electronic components and the inside wall face of at least some pump housing, the electric pump includes heat conduction liquid, at least some heat conduction liquid is located the second chamber, at least some electronic components and heat conduction liquid contact, the material of pump housing is heat conduction material at least part, define heat conduction material part and be the contact portion, at least some contact portion and heat conduction liquid contact.

In the scheme of the application, the electric pump comprises a second cavity, the control panel assembly comprises electronic components, the side wall corresponding to the second cavity comprises at least part of the outer side wall surface of the electronic components and at least part of the inner side wall surface of the pump shell, the electric pump comprises heat conducting liquid, at least part of the heat conducting liquid is positioned in the second cavity, at least part of the electronic components are in contact with the heat conducting liquid, at least part of the pump shell is made of heat conducting materials, the heat conducting material is defined as a contact part, and at least part of the contact part is in contact with the heat conducting liquid. Thus, the heat dissipation of the control panel assembly is facilitated, and the service life of the electric pump is prolonged.

[ description of the drawings ]

FIG. 1 is a schematic perspective view of one embodiment of an electric pump of the present application in one view;

FIG. 2 is a schematic cross-sectional view of the electric pump of FIG. 1 in one direction;

fig. 3 is a schematic cross-sectional structure of the bottom cover in one direction in fig. 2, 6, 7 and 8;

fig. 4 is a schematic perspective view of the embodiment of fig. 2, 6, 7 and 8 showing the electric pump from one perspective;

FIG. 5 is a schematic perspective view of the second and fourth portions of FIG. 4 shown in one view;

FIG. 6 is a schematic cross-sectional view of another embodiment of an electric pump according to the present application in one direction;

FIG. 7 is a schematic cross-sectional view of a third embodiment of an electric pump according to the present application in one direction;

fig. 8 is a schematic cross-sectional view of a fourth embodiment of an electric pump according to the present application in one direction;

fig. 9 is a schematic perspective view of the control panel assembly of fig. 2, 6, 7 and 8 from one perspective;

FIG. 10 is a schematic perspective view of the spacer sleeve of FIGS. 2, 6, 7 and 8 from one perspective;

in the accompanying drawings: 100: an electric pump; 11: a pump housing; 111: a first housing; 1111: a feed port; 1112: outflow port, 1113: a first connection portion; 112: a second housing; 1121: a second connecting portion; 1122: a first inner groove; 113: a bottom cover; 1131: a first wall surface; 1132: a second wall surface; 121: a rotor assembly; 122: an impeller assembly; 13: a stator assembly; 131: a stator; 14: a pump shaft; 15: a control panel assembly; 151: a substrate; 1511: a front face; 1512: a reverse side; 152: an electronic component; 16: a spacer sleeve; 161: a top; 1611: a flange portion; 162: a bottom; 1621: an upper surface; 1622 a lower surface; 163: a side portion; 1631: an inner surface; 1632: an outer surface; 164: a pump shaft limit part; 18: a second communication portion; 19: a socket; 20: a thermally conductive liquid; 22: an oil inlet part; 221: a first section; 222: a second section; 23: an air outlet portion; 231: a third section; 232: a fourth section; 25: a first seal ring; 26: a second seal ring; 27: a first chamber; 281: a second chamber; 282: a third chamber; 29: a fourth chamber; 101: the axial direction of the motor pump; 1123: a third connecting portion; 1133: a fourth connecting portion; 40: a second inner groove; 50: a third seal ring; 51, a first communication part;

[ detailed description ] of the application

The application is further described with reference to the accompanying drawings and specific examples:

the following detailed description of the application refers to the accompanying drawings. First, it should be noted that, in the present specification, terms of upper, lower, left, right, front, rear, inner, outer, top, bottom, and the like are defined with respect to the configurations shown in the corresponding drawings, and are relative concepts, so that they may be changed according to different positions and different usage states. Therefore, these and other directional terms should not be construed as limiting terms.

The electric pump in the following embodiments is capable of providing flow power to a working medium of an automotive thermal management system, the working medium comprising 50% glycol aqueous solution or clear water.

Referring to fig. 1 and 2, the electric pump 100 includes a pump housing 11, a rotor assembly 121, a stator assembly 13, a pump shaft 14, a control plate assembly 15, a spacer, and an impeller assembly 122, the pump housing 11 includes a first housing 111, a second housing 112, and a bottom cover 113, the second housing 112 is located between the first housing 111 and the bottom cover 113 along a height direction of the electric pump 100, and of course, only a part of the second housing 112 may be located between the first housing 111 and the bottom cover 113; referring to fig. 1 and 2, the first housing 111, the second housing 112 and the bottom cover 113 are fixedly and sealingly connected with each other, the electric pump 100 has a first cavity 27 and a second cavity 281, the first cavity 27 can have a working medium flowing therethrough, the second cavity 281 has no working medium flowing therethrough, at least part of the pump shaft 14 is disposed in the first cavity 27, the rotor assembly 121 is sleeved on the outer side of the pump shaft 14, the rotor assembly 121 is fixedly connected with the impeller assembly 122, the stator assembly 13 includes a stator 131 and a pin, and the stator 131 is electrically connected with the control board assembly 15 through the pin.

Referring to fig. 1 and 2, the first housing 111 is an injection molding member, the injection molding member is provided with a flow inlet 1111 and a flow outlet 1112, when the electric pump 100 works, a working medium enters the first cavity 27 through the flow inlet 1111, then the working medium leaves the first cavity 27 through the flow outlet 1112, when the electric pump 100 works, a control circuit on the control board assembly 15 is connected with an external power supply by inserting a connector (not shown in the drawing) into a connector socket 19 of the electric pump 100, the control circuit controls current passing through the stator assembly 13 to change according to a certain rule, so that the stator assembly 13 is controlled to generate a changing magnetic field, the rotor assembly 121 rotates around the pump shaft 14 under the action of the magnetic field or rotates along with the pump shaft 14, so that the working medium entering the first cavity 27 rotates along with the rotor assembly 121, and the working medium leaves the first cavity 27 due to centrifugal force to generate flowing power.

As an implementation manner, referring to fig. 1, 2, 3 and 9, the electric pump includes a second cavity, the control board assembly 15 includes an electronic component 152, a sidewall corresponding to the second cavity 281 includes at least a portion of an outer sidewall surface of the electronic component 152 and at least a portion of an inner sidewall surface of the pump housing 11, the electric pump 100 includes a heat conducting liquid 20, at least a portion of the heat conducting liquid 20 is located in the second cavity 281, at least a portion of the electronic component 152 is in contact with the heat conducting liquid 20, at least a portion of a material of the pump housing 11 is a heat conducting material, a portion of the heat conducting material is defined as a contact portion, and at least a portion of the contact portion is in contact with the heat conducting liquid 20. In this way, firstly, heat generated by at least part of the heating electronic components exchanges heat with the heat conducting liquid 20, and as the heat conducting liquid 20 contacts with the contact portion, the heat generated by at least part of the heating electronic components 152 is transferred to the outside of the electric pump 100 through the contact portion, so that the heat dissipation of the control board assembly 15 is facilitated, and the service life of the electric pump 100 is further prolonged. And secondly, the heating electronic components comprise common electronic components which are easy to heat, such as a diode, an MOS tube, an inductor, a resistor, a capacitor and the like. In these heat-generating electronic components, the switching tube (diode, MOS tube) is more sensitive to heat, so in order to quickly dissipate the heat of the switching tube, the switching tube is usually disposed on the first wall 1131 near the bottom cover 113, and other heat-generating electronic components, such as an inductor, a resistor and a capacitor, are far away from the first wall 1131 of the bottom cover 113 due to the limited surface area of the first wall 1131 of the bottom cover 113, and the other heat-generating electronic components can dissipate the heat only by air conduction, so that the heat dissipation efficiency is relatively slow, and the service life of the other heat-generating electronic components is likely to be reduced. Through the above arrangement, on the one hand, the arrangement of the heat-generating electronic components on the control board assembly 15 is not affected by the area of the first wall surface 1131 of the bottom cover 113, and the arrangement space of the heat-generating electronic components 152 is increased, so that the limited area of the substrate 151 can be utilized as much as possible, which is beneficial to realizing miniaturization of the substrate 151 and further realizing miniaturization design of the electric pump 100; on the other hand, the arrangement of the heating electronic components on the control panel assembly 15 is not affected by the area of the first wall surface 1131 of the bottom cover 113, the arrangement space of the heating electronic components is increased, the optimization of the control circuit in the control panel assembly 15 is facilitated, and a certain foundation is laid for reducing the production cost of the electric pump 100; in the third aspect, the heat-generating electronic component may be integrally immersed in the heat-conducting liquid 20, and the electronic component 152 may fully exchange heat with the heat-conducting liquid 20, so as to effectively improve the heat dissipation efficiency of the electronic component 152. In the fourth aspect, due to reasonable heat dissipation, the selectable space of the electronic component 152 is increased, for example, a MOS transistor with a larger internal resistance can be selected, which is beneficial to reducing the production cost of the heat-generating electronic component 152, and further reducing the production cost of the electric pump 100.

Further, as an implementation, the heat conducting material includes a heat conducting plastic or a metal material, and the heat conducting plastic has a heat conducting coefficient greater than or equal to that of the metal at the same temperature. The metal material herein includes, but is not limited to, aluminum, copper, aluminum alloy, stainless steel, and the like. As an implementation manner, please refer to fig. 1, 2 and 9, the pump housing 11 includes a bottom cover 113 and a second housing 112, the bottom cover 113 and the second housing 112 are disposed along a height direction of the electric pump 100, and the bottom cover 113 and the second housing 112 are fixedly connected, so that a miniaturization design of a radial direction of the electric pump 100 is facilitated, it should be noted that an axis extending direction of a pump shaft of the electric pump 100 is an axial direction 101 of the electric pump 100, and a direction 101 perpendicular to the axial direction of the electric pump 100 is a radial direction of the electric pump 100. The direction from the bottom cover 113 to the second housing 112 is the positive axial direction of the electric pump 100, and the direction opposite to the positive direction is the negative axial direction of the electric pump 100. The control board assembly 15 is located in an inner cavity surrounded by the bottom cover 113 and the second housing 112, the cavity between the control board assembly 15 and the bottom cover 113 includes a second cavity 281, the electronic component 152 includes a heat generating electronic component, at least the heat generating electronic component is located in the second cavity 281, at least the electronic component 152 is in contact with the heat conducting liquid 20, and the contact portion is located in the bottom cover 113 or the contact portion includes the bottom cover 113. Specifically, at least a portion of the bottom cover 113 is made of a metal material. As one implementation, a part of the bottom cover 113 is made of a metal material, and the contact part is located at the bottom cover 113; as another implementation, the material of the bottom cover 113 is all metal material, and the contact part includes the bottom cover 113. In this way, only the second cavity 281 may be filled with an appropriate amount of the heat-conducting liquid 20, so that at least part of the heat-generating electronic components in the second cavity 281 are in contact with the heat-conducting liquid 20 and perform at least part of heat exchange, and at the same time, the heat-conducting liquid 20 is in contact with the bottom cover 113, and heat generated by the heat-generating electronic components is transferred to the outside of the electric pump 100 through the bottom cover 113, thereby facilitating the lightweight design of the electric pump 100.

Further, referring to fig. 3 and 4, the bottom cover 113 includes a first wall 1131 and a second wall 1132, the first wall 1131 is located in the second cavity 281, at least a portion of the outer surface 1632 of the second wall 1132 is exposed and forms a portion of the outer surface of the electric pump 100, the electric pump 100 further includes heat dissipation fins 21, and the heat dissipation fins 21 are disposed on the second wall 1132. Specifically, the heat dissipation fins 21 include a plurality of heat dissipation portions 211, and the heat dissipation portions 211 protrude from the second wall surface 1132 and extend along the axial negative direction of the electric pump 100. In this way, the heat dissipation efficiency of the control board assembly 15 can be improved.

Further, referring to fig. 4 and 5, the electric pump 100 further includes an oil inlet portion 22, the oil inlet portion 22 includes a first portion 221 and a second portion 222, the first portion 221 is of a hole structure, the second portion 222 is of a column structure, one end of the first portion 221 is communicated with the second cavity 281, the other end of the first portion 221 is communicated with the outside of the electric pump 100, at least part of the second portion 222 is located in the first portion 221, and the first portion 221 and the second portion 222 are fixedly connected in a sealing manner. Further, the oil inlet 22 is disposed on the bottom cover 113, and the oil inlet 22 is directly connected to the second cavity 281, so that the structure of the oil inlet 22 is simplified, and the structure of the electric pump 100 is simplified.

Further, referring to fig. 4 and 5 again, the electric pump 100 further includes an air outlet portion 23, the air outlet portion includes a third portion 231 and a first portion 232, the third portion 231 is of a hole structure, the first portion 232 is of a column structure, one end of the third portion 231 is directly communicated with the second cavity 281, the other end of the third portion 231 is communicated with the outside of the electric pump 100, at least part of the third portion 232 is located in the third portion 231, and the third portion 231 is fixedly connected with the first portion 232 in a sealing manner. When filling the heat conductive liquid 20 into the electric pump 100, the first portion 232 is not installed into the third portion 231, and the third portion 231 may serve as an outlet of air inside the electric pump 100. The other end of the third portion 231 communicates with the outside of the electric pump 100, and at least a part of the fourth portion 232 is located in the third portion 231, and the third portion 231 is fixedly connected to the first portion 232 in a sealing manner. Specifically, the oil inlet portion 22 and the air outlet portion are provided on the bottom cover 113. When the heat conducting liquid 20 is filled, the second portion 222 is not fixedly connected to the first portion 221 in a sealing manner, the first portion 232 is not fixedly connected to the second portion 222 in a sealing manner, after the insulating heat conducting liquid 20 is filled, the first portion 221 is fixedly connected to the second portion 222 in a sealing manner, and the third portion 231 is fixedly connected to the second portion 222 in a sealing manner. In this embodiment, the bottom cover 113, the second portion 222 and the first portion 232 are all plastic members, the first portion 221 and the second portion 222 may be fixedly connected by welding, and the third portion 231 and the first portion 232 may be fixedly connected by welding. Further, in order to enhance the sealability of the first portion 221 and the second portion 222, a leakage preventing glue may be disposed circumferentially around the gap where the first portion 221 and the second portion 222 are connected, and a leakage preventing glue may be disposed circumferentially around the gap where the third portion 231 and the second portion 232 are connected, for preventing the heat conductive liquid 20 from penetrating to the outside of the electric pump 100 through the gap.

Further, as an implementation, as shown in fig. 2 and 9, the heat conducting liquid 20 is an insulating heat conducting liquid, and the insulating heat conducting liquid has an insulating property and a heat conducting property, and specifically, the heat conducting coefficient of the insulating heat conducting liquid is greater than that of air at the same temperature. The resistivity of the insulating heat-conducting liquid at normal temperature is more than or equal to 10 ¹⁰ Omega.m. The thermal conductivity of air, λ (W/m.k), increases with increasing temperature. The thermal conductivity of air at 0℃is 0.024 and at 100℃is 0.031. More specifically, the insulating and heat conducting liquid includes insulating and heat conducting oil. Of course, the heat-conducting oil is not limited to insulating heat-conducting oil, and other liquids with insulating and heat-conducting properties can be used. In this way, when the electronic component 152 of the control board assembly 15 is surface-treated, a protection portion (not shown) for reducing corrosion of the electronic component 152 by the heat-conducting liquid 20 may be provided only on the surface of the electronic component 152, specifically, the electronic component 152Including welded part and components and parts, components and parts pass through welded part and base plate 151 electricity and are connected, and the guard portion sets up at least the surface of components and parts, the surface of welded part. In this way, the manufacturing process of the control board assembly 15 can be effectively simplified, the production cycle of the electric pump 100 can be shortened, and the production cost of the electric pump 100 can be further reduced. Because the thermal conductivity of the insulating and thermally conductive liquid 20 is greater than that of air, the heat dissipation efficiency can be effectively improved compared with the prior method of conducting heat through air.

Of course, as another implementation manner, referring to fig. 2 and 9 again, the heat-conducting liquid 20 may have only a heat-conducting property, and the electronic component 152 of the control board assembly 15 may be subjected to an insulation treatment, and the electric pump 100 further includes an insulation portion (not shown in the drawings) for isolating the electronic component 152 from the heat-conducting liquid 20. Specifically, the electronic component 152 includes a solder portion, an insulating portion, and a component, and the component is electrically connected to the substrate 151 through the solder portion. The insulating part is arranged at least on the outer side wall surface of the component and the surface of the welding part. The insulation does not affect the heat transfer between the electronic component 152 and the heat conducting liquid 20. Because the heat conducting liquid 20 only has the heat conducting property, the selectable space of the heat conducting liquid 20 is increased, and a certain foundation is laid for reducing the production cost of the electric pump 100. Further, in order to prevent the insulating and heat-conducting liquid from corroding the insulating portion, as an implementation manner, the electronic component includes an insulating portion, a soldering portion, a protecting portion, and a component, the component is electrically connected to the substrate 151 through the soldering portion, the insulating portion is at least disposed on an outer side wall surface of the component, a surface of the soldering portion, and the protecting portion is at least disposed on a surface of the insulating portion. In this way, the service life of the electronic component is prolonged.

As an implementation, referring to fig. 2 and 6, the electric pump 100 further includes a spacer sleeve 16, the spacer sleeve 16 is disposed in the pump housing 11, the electric pump 100 further includes a third cavity 282, the third cavity 282 is located between the base plate 151 and the spacer sleeve 16, the electric pump 100 includes a first communication portion 51, and the second cavity 281 and the third cavity 282 are communicated through the first communication portion 51. Through such a mode, second chamber 281 and third chamber 282 intercommunication setting, second chamber 281 and third chamber 282 can set up heat conduction liquid 20 simultaneously, the base plate 151 includes positive 1511 and reverse side 1512, positive 1511 is close to spacer 16 setting, reverse side 1512 keeps away from spacer 16 setting, so, the positive 1511 of base plate 151 and reverse side 1512 all can set up and arrange the electronic components that generates heat, increase the space that generates heat the electronic components that generates heat promptly, when realizing the heat dissipation to the electronic components that generates heat, still be favorable to realizing the miniaturized design of base plate 151, and then lay a certain basis for the miniaturized design of electric pump 100.

Further, referring to fig. 7, the electric pump 100 includes a fourth cavity 29, the electric pump 100 includes a stator assembly 13, the stator assembly 13 is in limited connection with the spacer 16, the stator assembly 13 is located in the fourth cavity 29, the electric pump 100 further includes a second communication portion 18, the third cavity 282 is communicated with the fourth cavity 29 through the second communication portion 18, the heat conductive liquid 20 is located in the fourth cavity 29, and at least part of the stator assembly 13 is in contact with the heat conductive liquid 20. In this way, the heat generated by the stator assembly 13 exchanges heat with the heat-conducting liquid 20, and the heat is output to the outside of the electric pump 100 through the bottom cover 113, so that the heat dissipation can be performed on the control board assembly 15 and the stator assembly 13 at the same time, which is beneficial to prolonging the service life of the electric pump 100, especially the high-power electric pump 100.

Further, in the above embodiment, referring to fig. 7 and 10 again, heat generated by the control board assembly 15 or the control board assembly 15 and the stator assembly 13 is output to the outside of the electric pump 100 through heat exchange between the heat conducting liquid 20 and the bottom cover 113, so as to achieve heat dissipation of the control board assembly 15 or heat dissipation of the stator assembly 13 and the control board assembly 15, however, other implementations are also possible, for example, at least part of the insulating sleeve 16 is made of a metal material, the cavity formed by the inner side wall of the insulating sleeve 16 is the first cavity 27, when the electric pump 100 works, the working medium flows in the first cavity 27, and the heat generated by the control board assembly 15 and the stator assembly 13 is transferred to the outside of the electric pump 100 through the flow of the working medium. Specifically, the spacer 16 includes a bottom 162 and a side 163, the cavity enclosed by the bottom 162 and the side 163 includes a first cavity 27, the rotor assembly is located in the first cavity 27, and the stator assembly 13 and the side 163 are in a limited connection, which includes an interference fit, a transition fit, and a clearance fit, and further, if the clearance fit is provided, a heat-conducting glue may be disposed between the stator assembly 13 and the side 163. The heat conducting liquid 20 contacts with the side part 163, the heat conducting liquid 20 contacts with the bottom part 162, and when the electric pump 100 works, heat generated by the stator assembly 13 and the control panel assembly 15 is output to the outside of the electric pump 100 through working medium flowing in the isolation sleeve 16, so that heat dissipation of the high-power electric pump 100 is more facilitated.

To achieve that the first cavity is not in communication with the second cavity, as an implementation, please refer to fig. 8 and 10, the spacer 16 includes a top portion 161, a bottom portion 162 and a side portion 163, the side portion 163 is located between the top portion 161 and the bottom portion 162, the top portion 161 includes a flange portion 1611, the flange portion 1611 extends radially outward of the side portion 163, the first cavity 27 is located inside the side portion 163, and the stator assembly 13 is disposed outside the side portion 163, and specifically, the stator 131 is disposed in cooperation with the side portion 163 of the spacer 16, where the cooperation includes interference fit, transition fit or clearance fit. The first housing 111 includes a first connection portion 1113, the second housing 112 includes a second connection portion 1121, the flange portion 1611 is located between the first connection portion 1113 and the second connection portion 1121, the second connection portion 1121 includes a first inner groove 1122, the first inner groove 1122 is recessed in an upper surface 1621 of the second connection portion 1121, the electric pump 100 further includes a first seal ring 25, the first seal ring 25 is located in the first inner groove 1122, a lower surface of the flange portion 1611 is in contact with the first seal ring 25, a certain force is applied in a direction perpendicular to an upper surface of the flange portion 1611, for example, a certain downward force may be applied, and the lower surface of the flange portion 1611 and the second connection portion 1121 are in sealing connection through the first seal ring 25, so that the first chamber 27 and the second chamber 281 are in sealing non-communication. The working medium is prevented from seeping out to the outside of the side portion 163 from the gap between the second connecting portion 1121 and the lower surface of the flange portion 1611 by the structure in which the first seal ring 25 is provided. More specifically, the electric pump 100 further includes a second sealing ring 26, where the second sealing ring 26 is disposed between the first housing 111 and the upper surface of the flange portion 1611, and the first housing 111, the spacer sleeve 16, and the second housing 112 are fixedly connected in a sealing manner by a fastening structure, specifically, the first housing 111, the spacer sleeve 16, and the second housing 112 are fixedly connected in a sealing manner by bolts, and other manners, for example, the first housing 111 and the second housing 112 are all made of plastic materials, the first housing 111 and the second housing 112 are fixedly and hermetically connected by welding, and the second sealing ring 26 is configured to form a two-way protection, so that it is fully ensured that an external medium does not penetrate into the outer side of the side portion 163 of the spacer sleeve 16. Referring to fig. 8, the second housing 112 includes a third connecting portion 1123, the bottom cover includes a fourth connecting portion 1133, the third connecting portion 1123 or the fourth connecting portion 1133 is provided with a second groove 40, in this embodiment, the second groove 40 is concave in the lower surface of the third connecting portion 1123, a third sealing ring 50 is disposed in the second groove 40, and the third connecting portion 1123 and the fourth connecting portion 1133 are fixedly connected by the third sealing ring 50. To enhance the sealing property of the second chamber 281, an adhesive portion may be provided around a circumference of a gap where the third connection portion 1123 and the fourth connection portion 1133 are connected, the adhesive portion being for preventing the heat conductive liquid 20 in the second chamber 281 from leaking to the outside of the electric pump through the gap where the third connection portion 1123 and the fourth connection portion 1133 are connected.

It should be noted that: the above embodiments are only for illustrating the present application and not for limiting the technical solutions described in the present application, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present application may be modified or substituted by equivalent ones, and all modifications thereof without departing from the spirit and scope of the present application are intended to be included in the scope of the claims of the present application.

Claims

1. An electric pump comprising a pump housing (11) and a control board assembly (15), characterized in that: the electric pump (100) comprises a second cavity (281), the control board assembly (15) comprises an electronic component (152), the side wall corresponding to the second cavity (281) comprises at least part of the outer side wall surface of the electronic component (152) and at least part of the inner side wall surface of the pump housing (11), the electric pump (100) comprises heat conducting liquid (20), at least part of the heat conducting liquid (20) is located in the second cavity (281), at least part of the electronic component (152) is in contact with the heat conducting liquid (20), at least part of the material of the pump housing (11) is heat conducting material, the heat conducting material is defined to be a contact part, and at least part of the contact part is in contact with the heat conducting liquid (20).

2. The electric pump of claim 1, wherein: the heat conducting material comprises heat conducting plastic or metal material, and the heat conducting coefficient of the heat conducting plastic is larger than or equal to that of the metal at the same temperature.

3. The electric pump according to claim 1 or 2, characterized in that: the pump housing (11) comprises a bottom cover (113) and a second housing (112), the bottom cover (113) and the second housing (112) are arranged along the height direction of the electric pump (100), the bottom cover (113) and the second housing (112) are fixedly connected or integrally arranged, the control panel assembly (15) is positioned in an inner cavity defined by the bottom cover (113) and the second housing (112), the second cavity (281) is positioned between the control panel assembly (15) and the bottom cover (113), and the contact part is positioned in the bottom cover (113) or the contact part comprises the bottom cover (113).

4. A motor pump according to any one of claims 1-3, characterized in that: the bottom cover (113) comprises a first wall surface (1131) and a second wall surface (1132), the wall surface corresponding to the second cavity (281) comprises the first wall surface (1131), at least part of the outer surface of the second wall surface (1132) is exposed and forms part of the outer surface of the electric pump (100), the electric pump (100) further comprises heat dissipation fins, and the heat dissipation fins are arranged on the second wall surface (1131).

5. An electric pump according to any one of claims 1-4, characterized in that: the electric pump (100) further comprises an oil inlet part (22), the oil inlet part (22) comprises a first part (221) and a second part (222), the first part (221) is of a hole-shaped structure, the second part (222) is of a columnar structure, one end of the first part (221) is communicated with the second cavity (281), the other end of the first part (221) is communicated with the outside of the electric pump (100), at least part of the second part (222) is located in the first part (221), and the first part (221) is fixedly connected with the second part (222) in a sealing mode.

6. The electric pump of claim 5, wherein: the electric pump further comprises an air outlet part (23), the air outlet part (23) comprises a third part (231) and a fourth part (232), the third part (231) is of a hole-shaped structure, the fourth part (232) is of a columnar structure, one end of the third part (231) is communicated with the second cavity (281), the other end of the third part (231) is communicated with the outside of the electric pump (100), at least part of the fourth part (232) is located in the third part (231), and the third part (231) is fixedly connected with the fourth part (232) in a sealing mode.

7. An electric pump according to any one of claims 1-6, characterized in that: the heat conductive liquid (20) comprises an insulating heat conductive liquid, the heat conductive coefficient of the insulating heat conductive liquid is larger than that of air at the same temperature, and the resistivity of the insulating heat conductive liquid is larger than or equal to 10 at normal temperature ¹⁰ Ω.m。

8. The electric pump according to any one of claims 1-7, characterized in that: the control board assembly (15) comprises a substrate (151), the electronic component (152) comprises a welding part, an insulating part and a component, the component is electrically connected with the substrate (151) through the welding part, the insulating part is at least arranged on the outer side wall surface of the component and the surface of the welding part, and the insulating part isolates the electronic component (152) from the heat conducting liquid (20).

9. An electric pump according to any one of claims 1-8, characterized in that: the electronic component further comprises a protection part and a component, wherein the protection part is arranged on the outer surface of at least part of the component.

10. An electric pump according to any one of claims 2-9, characterized in that: the electric pump further comprises an isolation sleeve (16), the isolation sleeve (16) is arranged in the pump housing (11), the electric pump (100) further comprises a third cavity (282), the third cavity is located between the control panel assembly (15) and the isolation sleeve (16), the electric pump (100) comprises a first communication part (51), and the second cavity (281) and the third cavity (282) are communicated through the first communication part (51).

11. The electric pump of claim 10, wherein: the electric pump (100) comprises a fourth cavity (29), the electric pump (100) comprises a stator assembly (13), the stator assembly (13) is in limit connection with the isolation sleeve (16), the stator assembly comprises a stator core and a winding, the winding is wound on the stator core, a wall surface corresponding to the fourth cavity (29) comprises at least part of an outer surface of the winding, the electric pump (100) further comprises a second communication part (18), and the third cavity (282) is communicated with the fourth cavity (29) through the second communication part (18), and at least part of the winding is in contact with the heat conducting liquid (20).