CN217270865U

CN217270865U - Electric pump

Info

Publication number: CN217270865U
Application number: CN202122679670.9U
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2021-01-26
Filing date: 2021-11-03
Publication date: 2022-08-23
Anticipated expiration: 2031-11-03

Abstract

An electric pump comprises a rotor assembly, a stator assembly, an isolation sleeve and an electric control board assembly, wherein the isolation sleeve comprises a bottom part, and the lower surface of the bottom part is closer to the electric control board assembly than the upper surface of the bottom part along the height direction of the electric pump; the electric pump also comprises a heat dissipation plate and a first shell, wherein the heat dissipation plate is embedded in the first shell, and the first shell is an injection molding piece; at least part of the heat dissipation plate is arranged between the electric control plate assembly and the lower surface of the bottom; at least part of the lower surface of the bottom is in direct contact with at least part of the heat dissipation plate, or heat conduction silicone grease or heat conduction silicone rubber is arranged between at least part of the lower surface of the bottom and at least part of the heat dissipation plate; the heat dissipation of the electric control board assembly is facilitated, and the service life of the electric pump is prolonged.

Description

Electric pump

Technical Field

The present application relates to a fluid pump, and more particularly to an electric pump.

Background

The electric pump comprises an electric control board assembly, the electric control board assembly comprises electronic components, some electronic components can generate heat when working, and the heat is accumulated to a certain degree and cannot be timely dissipated to influence the performance of the electric control board assembly, so that the service life of the electric pump is shortened.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide an electric pump, is favorable to the heat dissipation of automatically controlled board subassembly to be favorable to improving electric pump's life.

In order to achieve the above purpose, an embodiment of the present application adopts the following technical solutions: an electric pump comprises a rotor assembly, a stator assembly, an isolation sleeve and an electric control plate assembly, wherein the electric pump is provided with a first cavity and a second cavity, the first cavity is positioned at one side of the isolation sleeve, the second cavity is positioned at the other side of the isolation sleeve, the rotor assembly is arranged in the first cavity, and the stator assembly and the electric control plate assembly are arranged in the second cavity; the isolation sleeve comprises a bottom part, and the lower surface of the bottom part is closer to the electric control board assembly than the upper surface of the bottom part along the height direction of the electric pump; the electric pump also comprises a heat dissipation plate and a first shell, wherein the first shell is an injection molding piece, and the heat dissipation plate is used as an insert to form the first shell by injection molding; at least part of the heat dissipation plate is arranged between the electric control plate assembly and the lower surface of the bottom; at least part of the lower surface of the bottom is in direct contact with at least part of the heat dissipation plate, or heat conduction silicone grease or heat conduction silicone rubber is arranged between at least part of the lower surface of the bottom and at least part of the heat dissipation plate.

In the technical scheme provided by the application, the electric pump further comprises a heat dissipation plate and a first shell, the first shell is an injection molding part, the heat dissipation plate is at least used as an insert for injection molding to form the first shell, and at least part of the heat dissipation plate is arranged between the electric control plate assembly and the lower surface of the bottom of the isolation sleeve; at least part of the lower surface of the bottom is directly contacted with at least part of the heat dissipation plate, or heat conduction silicone grease or heat conduction silicone is arranged between at least part of the lower surface of the bottom and at least part of the heat dissipation plate; the heat dissipation of the electric control board assembly is facilitated, so that the influence of heat on the electric control board assembly on the performance of the electric control board assembly is prevented, and the service life of the electric pump is prolonged.

Drawings

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

FIG. 2 is a partial schematic view of a first embodiment of a partial structure of the electric pump of FIG. 1;

FIG. 3 is a partial schematic view of a second embodiment of a partial structure of the electric pump of FIG. 1;

fig. 4 is a perspective view of the first housing and the heat radiating plate of fig. 1 coupled together;

fig. 5 is a front view schematically showing a structure in which the first housing and the heat radiating plate of fig. 4 are coupled together;

FIG. 6 is a schematic view of a cross-sectional structure taken along line A-A of FIG. 5;

FIG. 7 is a schematic view of a cross-sectional structure taken along line B-B of FIG. 5;

fig. 8 is a perspective view of the heat sink of fig. 1 from a perspective;

fig. 9 is a perspective view of the heat sink of fig. 1 from another perspective;

fig. 10 is a schematic front view of the heat sink in fig. 8;

FIG. 11 is a schematic view of a cross-sectional configuration taken along line A-A of FIG. 10;

fig. 12 is a schematic cross-sectional view of a second embodiment of the electric pump of the present application.

Detailed Description

The application is further described with reference to the following figures and specific examples:

the pump device in the following embodiments can provide flowing power for the working medium of the vehicle thermal management system, and the working medium may be a 50% glycol aqueous solution or clear water, but the working medium may also be other components. The electric pump in the present application will be described in detail below; here, it should be noted that: for convenience of description, the terms "upper", "lower", "high", "low", "top", "bottom" and the like are used hereinafter with reference to the state in which the respective components of the motor pump, which is not sectioned, are placed at the positions shown in fig. 1.

Referring to fig. 1, the electric pump 100 includes a pump housing, a rotor assembly 1, a stator assembly 2, a pump shaft 3, a spacer 4, and an electric control board assembly 5, the pump housing includes an upper casing 6, a first casing 7, and a bottom cover 11, in this embodiment, the first casing 7 is located between the upper casing 6 and the bottom cover 11 along a height direction of the electric pump 100, and of course, only a part of the first casing 7 may be located between the upper casing 6 and the bottom cover 11; referring to fig. 1, the upper housing 6 is fixedly connected with the first housing 7, and the bottom cover 11 is fixedly connected with the first housing 7, specifically, the upper housing 6 is fixedly connected with the first housing 7 by screws, and the bottom cover 11 is fixedly connected with the first housing 7 by screws; the electric pump 100 has a first cavity 10 and a second cavity 20, the first cavity 10 can have a working medium flowing through, the second cavity 20 has no working medium flowing through, the rotor assembly 1 is disposed in the first cavity 10, the stator assembly 2 and the electric control board assembly 5 are disposed in the second cavity 20, and the stator assembly 2 is electrically connected with the electric control board assembly 5.

Referring to fig. 1, the upper housing 6 is an injection molded part, the upper housing 6 has a fluid inlet 61 and a fluid outlet 62, when the electric pump 100 works, a working medium enters the first cavity 10 through the fluid inlet 61, and then the working medium leaves the first cavity 10 through the fluid outlet 62, when the electric pump 100 works, a connector (not shown in the figure) is inserted into a connector (not shown in the figure) of the electric pump 100, so that a control circuit on the electric control board assembly 5 is connected with an external power supply, the control circuit controls a current passing through the stator assembly 2 to change according to a certain rule, so as to control the stator assembly 2 to generate a changing magnetic field, a rotor of the rotor assembly 1 rotates around the pump shaft 3 under the action of the magnetic field, so that the working medium entering the first cavity 10 rotates along with the rotor assembly 1, and the working medium leaves the first cavity 10 due to a centrifugal force to generate flowing power.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a first embodiment of an electric pump; the structure of the first embodiment of the electric pump will be described in detail below.

Referring to fig. 1 and 2, the spacer 4 includes a bottom portion 41 whose lower surface 412 is closer to the electric control board assembly 5 than its upper surface 411 in the height direction of the electric pump 100; referring to fig. 1 to 3, the electric pump 100 further includes a heat dissipation plate 8, the heat dissipation plate 8 is embedded in the first housing 7, the first housing 7 is an injection molded part, and in this embodiment, the heat dissipation plate 8 is disposed between the electric control board assembly 5 and the lower surface 412 at the bottom of the spacer 4; of course, only part of the heat dissipation plate 8 may be disposed between the electrical control board assembly 5 and the lower surface 412 of the bottom of the isolation cover 4; referring to fig. 2, in the present embodiment, the heat conductive silicone grease or the heat conductive silicone gel 9 is disposed between the lower surface 412 of the bottom 41 of the insulating sleeve 4 and the heat dissipation plate 8, but of course, only part of the lower surface 412 of the bottom 41 of the insulating sleeve 4 may be disposed between the heat dissipation plate 8 and the heat conductive silicone grease or the heat conductive silicone gel 9, or at least part of the lower surface 412 of the bottom 41 of the insulating sleeve 4 may also be in direct contact with the heat dissipation plate 8, and in this case, it is not necessary to dispose the heat conductive silicone grease or the heat conductive silicone gel between the lower surface 412 of the bottom 41 of the insulating sleeve 4 and the heat dissipation plate 8; in this way, make the heat that the electronic components that generate heat that 5 is last distributed out partly at least can transmit for heating panel 8 and spacer sleeve 4 in proper order, because electric pump 100 is in the use, the inboard of spacer sleeve 4 has working medium, the heat that 4 receiving of spacer sleeve can transmit the inboard working medium for spacer sleeve 4 like this, that is to say, the heat of electronic components that generate heat has been taken away indirectly to the inboard working medium of spacer sleeve 4, be favorable to reducing the heat accumulation of electronic components that generate heat like this, thereby be favorable to preventing that the heat that electronic components that generate heat accumulated from causing the influence to the performance of electric control board subassembly, and then be favorable to improving the life of electric pump. In this embodiment, along the height direction of the electric pump 100, one end of the heat conductive silicone grease or heat conductive silicone rubber 9 contacts the heat dissipation plate 8, and the other end of the heat conductive silicone grease or heat conductive silicone rubber contacts the bottom 51 of the spacer 4.

In the application, the heating electronic components include common electronic components which are easy to heat, such as diodes, MOS transistors, inductors, resistors, capacitors and the like; there are two embodiments of the layout of the heat-generating electronic components on the substrate, and specifically, the first embodiment of the layout of the heat-generating electronic components on the substrate is as follows: referring to fig. 2, the electric control board assembly 5 includes a substrate 51 and a heat-generating electronic component 52, the substrate 51 includes a front surface 511 and a back surface 512, the front surface 511 is closer to the stator assembly than the back surface 512 along the height direction of the electric pump 100, in the embodiment, a part of the heat-generating electronic component 52 is disposed between the front surface 511 and the heat dissipation plate 8, and the heat-generating electronic component 51 disposed between the front surface 511 and the heat dissipation plate 8 is supported on the front surface 511 of the substrate 51; in this embodiment, the heat conductive silicone grease or the heat conductive silicone gel 9 is disposed between at least a part of the heat dissipation plate 8 and at least a part of the heat generating electronic component 52 disposed on the front surface 511 of the substrate 8, one end of the heat conductive silicone grease or the heat conductive silicone gel 9 contacts the heat dissipation plate 8, and the other end of the heat conductive silicone grease or the heat conductive silicone gel 9 contacts the heat generating electronic component 52 disposed on the front surface 511 of the substrate along the height direction of the electric pump 100; in this embodiment, the heat conductive silicone grease or the heat conductive silicone 9 is disposed between the heat dissipation plate 8 and at least a part of the heat generating electronic components 52 disposed on the front surface 511 of the 8 substrate, but of course, at least a part of the heat dissipation plate 8 may be in direct contact with at least a part of the heat generating electronic components disposed on the front surface 511 of the substrate, and at this time, it is not necessary to dispose the heat conductive silicone grease or the heat conductive silicone between the heat dissipation plate 8 and the heat generating electronic components 52 disposed on the front surface 511 of the 8 substrate; through the mode, the speed of heat transfer to the heating panel of the electric control panel assembly side is accelerated, and the heat dissipation efficiency is improved.

A second embodiment of the layout of the heat-generating electronic components on the substrate is: referring to fig. 3, the electric control board assembly 5 includes a substrate 51 and a heat-generating electronic component 52, the substrate 51 includes a front surface 511 and a back surface 512, the front surface 511 is closer to the stator assembly than the back surface 512 along the height direction of the electric pump 100, the heat-generating electronic component 52 is disposed on the back surface 512, in this embodiment, a heat-conducting silicone grease or a heat-conducting silicone rubber 9 is disposed between the heat-dissipating plate 8 and the front surface 511 of the substrate 51; of course, the heat dissipation plate 8 may be in direct contact with the front surface 511 of the substrate 51, and in this case, it is not necessary to provide a heat conductive silicone grease or a heat conductive silicone rubber between the heat dissipation plate 8 and the front surface 511 of the substrate 51; by the above mode, the speed of heat transfer to the heating panel of the electric control panel assembly side is accelerated, and the heat dissipation efficiency is improved.

Referring to fig. 1, in this embodiment, the bottom cover 11 is a metal member, and the bottom cover 11 covers the electronic control board assembly 5, so that a heat portion of the electronic control board assembly 5 can also be transferred to the bottom cover 11, and a portion of heat of the heat-generating electronic components on the electronic control board assembly 5 is dissipated through the bottom cover 11; referring to fig. 1, the electric pump 100 further includes a heat sink 111, and in the present embodiment, the heat sink 111 and the bottom cover 11 are integrated; of course, the heat sink 111 may be connected to the bottom cover 11 in a separate structure, where the "integral structure" means that the heat sink 111 and the bottom cover 11 are integrally processed, and the "separate structure" means that the heat sink 111 and the bottom cover 11 are separately processed into independent components and then fixedly connected together; in this embodiment, the heat dissipation area of the bottom cover 11 is increased by the heat dissipation fins 111, so that heat dissipation of the heat-generating electronic component on the electronic control board assembly is facilitated.

The structure of the heat dissipation plate will be described in detail below.

Referring to fig. 1, 4 to 6, the first housing 7 includes a main body portion 71 and a connecting portion 72, the main body portion 71 is connected to the connecting portion 72, and in this embodiment, a part of the main body portion 71 is disposed around the outer circumference of the stator assembly 4 in fig. 1; along the height direction of the electric pump 100, the connecting part 72 is positioned between the electric control board assembly 5 and the stator assembly 4, and the heat dissipation plate 8 is connected with the connecting part 72; in the present embodiment, the first surface 81 of the heat dissipation plate is farther from the electronic control board assembly 5 in fig. 1 than the second surface 80 of the heat dissipation plate in the height direction of the electric pump 100; the surface area of the first surface 81 of the heat dissipation plate 8 is larger than the surface area of the lower surface of the bottom 41 of the insulating sleeve 4, which is beneficial to increase the covering area of the heat dissipation plate 8 between the insulating sleeves 4, thereby being beneficial to increase the contact area between the heat dissipation plate 8 and the insulating sleeve 4, and further being beneficial to more heat transfer.

Referring to fig. 4 to 7, in the present embodiment, the material of the heat dissipation plate 8 is a metal material, such as aluminum, copper, aluminum alloy, stainless steel, and the like; referring to fig. 7 to 10, the heat dissipation plate 8 includes a plurality of first holes 83, and the first holes 83 are penetratingly disposed along a thickness direction of the heat dissipation plate 8; the first hole 83 is filled with plastic forming the connection 72.

Referring to fig. 8 to 10, in the present embodiment, the heat dissipation plate 8 includes a flange portion 84 and a body portion 85, and the flange portion 84 is connected to an outer edge of the body portion 85; the thickness of the flange portion 84 is smaller than the thickness of the body portion 85; the first hole 83 is formed in the flange 84; at least a portion of the flange portion 84 is embedded in the connecting portion 72. Referring to fig. 8 to 10, in the present embodiment, the flange portion 84 is not disposed along the entire outer circumference of the body portion 85, and referring to fig. 4, a set gap L is provided between the outer edge of the portion of the body portion 85, which is not connected to the flange portion 84, and the connecting portion 72 along the radial direction of the electric pump 100; thus, when the first housing 7 is formed by injection molding, the external mold can be disposed in the set space L to position the heat dissipation plate 8 in the circumferential direction, thereby facilitating to prevent the heat dissipation plate 8 from rotating during injection molding.

Referring to fig. 8 to 10, the heat dissipation plate 8 further includes a first concave portion 86 and a second concave portion 87, the first concave portion 86 and the second concave portion 87 are provided recessed from the first surface 81 of the heat dissipation plate 8 in the thickness direction of the heat dissipation plate 8, the first concave portion 86 is connected to the second concave portion 87, one side surface of the first concave portion 86 closer to the outer edge of the body portion 85 than the first concave portion 86 has an opening, and the cavity of the first concave portion 86 and the cavity of the second concave portion 87 are made to communicate through the opening; an opening of the second concave portion 87 is located at the outer edge of the body portion 85 in the radial direction of the heat dissipation plate 8; referring to fig. 5, 6 and 8, the cavities of first recess 86 and of second recess 87 are filled with plastic forming connection 72; in the present embodiment, the first recess 86 and the second recess 87 are closer to the outer edge corresponding to the body portion 85 not connected to the flange portion 84 than the outer edge of the flange portion 84; in this way, the portion corresponding to the main body portion 85 that is not connected to the flange portion 84 can be connected to the connection portion 72, which is advantageous for preventing the main body portion 85 that is not connected to the flange portion 84 from tilting upward; in the present embodiment, the first concave portion 86 and the second concave portion 87 are recessed from the first surface 81 of the heat dissipation plate 8, but the first concave portion 86 and the second concave portion 87 may be recessed from the second surface of the heat dissipation plate 8.

Referring to fig. 8 to 10, the heat dissipation plate 8 further includes a second hole 88 and a third hole 89, the second hole 88 is disposed to penetrate through a bottom surface of the first concave portion 86 along a thickness direction of the heat dissipation plate 8, the third hole 89 extends from the second surface of the heat dissipation plate 8 toward the first surface 81 of the heat dissipation plate 8, and the third hole 89 is a blind hole; the second hole 88 communicates with a third hole 89, the third hole 89 having a larger bore diameter than the second hole 88; with combined reference to fig. 6, 8 to 10, the second and

third holes

88, 89 are filled with plastic forming the connecting portion 72; in this way, it is advantageous to prevent the body portion 85, which is not connected to the flange portion 84, from tilting downward; in the present embodiment, the third hole 89 extends from the second surface 80 of the heat spreader 8 toward the first surface 81 of the heat spreader 8, but of course, when the first concave portion 86 and the second concave portion 87 are recessed from the second surface 80 of the heat spreader 8, the third hole 89 may extend from the first surface 81 of the heat spreader 8 toward the second surface 80 of the heat spreader 8.

Referring to fig. 1, in the present embodiment, the material of the isolation sleeve 4 is a metal material; the spacer 4 is formed by drawing a metal plate by punching; the thickness value of the isolation sleeve 4 is 0.4mm-1mm, for example, the thickness of the isolation sleeve 4 can be 0.5mm, 0.6mm or 0.8mm, so that on one hand, the strength of the isolation sleeve 4 is ensured, and meanwhile, the thin side wall is more favorable for heat conduction among the working medium, the side wall of the isolation sleeve 4 and the stator assembly, so that the heat dissipation of the stator assembly is facilitated, and on the other hand, if the thickness of the isolation sleeve 4 is too thick, the electromagnetic eddy current can be increased in the use process of the electric pump, so that the performance of the motor is influenced; referring to fig. 1 and 2, in the present embodiment, the spacer 4 includes a pump shaft supporting portion 42, the pump shaft supporting portion 42 is formed at the bottom 41, the pump shaft supporting portion 42 is protruded toward the electronic control board assembly 5, and the pump shaft 3 extends into the pump shaft supporting portion 42 and is tightly fitted with the pump shaft supporting portion 42; referring to fig. 8, the heat dissipation plate 8 has a through hole 800, and the pump shaft supporting portion 42 passes through the through hole 800, in this embodiment, except for the pump shaft supporting portion 42, a heat conductive silicone grease or a heat conductive silicone rubber 9 is disposed between the lower surface of the spacer sleeve bottom portion 41 and the heat dissipation plate 8; of course, the bottom portion 41 may be provided in contact with the heat sink 8 on the lower surface thereof, except for the pump shaft supporting portion 42.

Referring to fig. 12, fig. 12 is a schematic cross-sectional view of a second embodiment of the electric pump; the structure of the third embodiment of the electric pump will be described in detail below.

Referring to fig. 12, in the present embodiment, the bottom of the isolation sleeve 4 ' is flat, and heat conductive silica gel or heat conductive silicone grease is filled between the lower surface of the bottom 41 ' of the isolation sleeve 4 ' and the heat dissipation plate 8; referring to fig. 12, in the present embodiment, the pump shaft 3 ' is fixedly connected to the upper surface of the bottom 41 ' of the spacer 4 ' by welding; in this way, the spacer sleeve 4' does not need to be separately formed as a pump shaft support, which is beneficial to simplifying the structure of the spacer sleeve and further beneficial to relatively reducing the manufacturing cost of the spacer sleeve.

Compared with the first embodiment of the electric pump, in the embodiment, the bottom of the isolation sleeve 4 'is flat, and the pump shaft 3' is fixedly connected with the upper surface of the bottom 41 'of the isolation sleeve 4' by welding; for other structural features in this embodiment, reference may be made to the first embodiment of the electric pump, which is not described herein again.

It should be noted that: although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can make modifications and substitutions on the present application, and all technical solutions and modifications thereof without departing from the spirit and scope of the present application should be covered by the claims of the present application.

Claims

1. An electric pump comprises a rotor assembly, a stator assembly, a spacer sleeve and an electric control plate assembly, wherein the electric pump is provided with a first cavity and a second cavity, the first cavity is positioned on one side of the spacer sleeve, the second cavity is positioned on the other side of the spacer sleeve, the rotor assembly is arranged in the first cavity, and the stator assembly and the electric control plate assembly are arranged in the second cavity; the isolation sleeve comprises a bottom part, and the lower surface of the bottom part is closer to the electric control board assembly than the upper surface of the bottom part along the height direction of the electric pump; the method is characterized in that: the electric pump also comprises a heat dissipation plate and a first shell, wherein the first shell is an injection molding piece, and the heat dissipation plate is used as an insert to form the first shell by injection molding; at least part of the heat dissipation plate is arranged between the electric control plate assembly and the lower surface of the bottom part; at least part of the lower surface of the bottom is in direct contact with at least part of the heat dissipation plate, or heat conduction silicone grease or heat conduction silicone rubber is arranged between at least part of the lower surface of the bottom and at least part of the heat dissipation plate.

2. The electric pump of claim 1, wherein: the first shell comprises a connecting part, at least part of the connecting part is positioned between the electric control board assembly and the stator assembly along the height direction of the electric pump, and the heat dissipation board is connected with the connecting part; the heat dissipation plate includes a first surface and a second surface, the second surface being closer to the electronic control board assembly than the first surface in a height direction of the electric pump; the surface area of the first surface of the heat dissipation plate is larger than the surface area of the lower surface of the bottom.

3. The electric pump of claim 2, wherein: the heat dissipation plate is made of a metal material; the heat dissipation plate comprises at least one first hole, and the first hole penetrates through the heat dissipation plate along the thickness direction of the heat dissipation plate; the first hole is filled with plastic forming the first housing.

4. The electric pump of claim 2, wherein: the heat dissipation plate comprises a flange part and a body part, wherein the flange part is connected with the outer edge of the body part; the thickness of the flange portion is smaller than the thickness of the body portion; the first hole of the heat dissipation plate is positioned on the flange part; at least a part of the flange portion is buried in the connecting portion.

5. The electric pump of claim 4, wherein: the flange portion is provided along the outer periphery of the main body portion in a non-complete circle, and a predetermined gap is provided between the outer edge of the portion of the electric pump corresponding to the main body portion not connected to the flange portion and the connecting portion.

6. The electric pump of claim 5, wherein: the heat dissipation plate further comprises a first concave portion and a second concave portion, the first concave portion and the second concave portion are arranged in a concave mode from the first surface of the heat dissipation plate or the second surface of the heat dissipation plate, the first concave portion is connected with the second concave portion, and the second concave portion is closer to the outer edge of the body portion than the first concave portion; one side surface of the first recess has an opening through which the cavity of the first recess and the cavity of the second recess are connected; an opening of the second concave part is positioned at the outer edge of the main body part; the cavity of the first recess and the cavity of the second recess are filled with plastic forming the first housing; the first recess portion and the second recess portion are closer to an outer edge corresponding to the main body portion that is not connected to the flange portion than an outer edge of the flange portion.

7. The electric pump of claim 6, wherein: the heat dissipation plate further comprises a second hole and a third hole, the second hole penetrates through the bottom surface of the first concave portion along the thickness direction of the heat dissipation plate, the third hole extends from the second surface of the heat dissipation plate to the direction of the first surface of the heat dissipation plate, and the third hole is a blind hole; the second hole is communicated with the third hole, and the aperture of the third hole is larger than that of the second hole; the second and third bores are filled with plastic forming the first housing.

8. The electric pump according to any one of claims 1 to 7, characterized in that: the electric control board assembly comprises a substrate and a heating electronic component, the substrate comprises a front surface and a back surface, the front surface is closer to the stator assembly than the back surface along the height direction of the electric pump, the heating electronic component is arranged on the back surface, and the material of the heating panel is a metal material; at least part the heating panel with front direct contact, or at least part the heating panel with be provided with heat conduction silicone grease or heat conduction silica gel between the front, along the direction of height of electric pump, heat conduction silicone grease or heat conduction silica gel's one end with the heating panel contacts, heat conduction silicone grease or heat conduction silica gel's the other end with the base plate contacts.

9. The electric pump according to any one of claims 1 to 7, characterized in that: the electric control board assembly comprises a substrate and a heating electronic component, the substrate comprises a front surface and a back surface, the front surface is closer to the stator assembly than the back surface along the height direction of the electric pump, at least part of the heating electronic component is arranged between the front surface and the heat dissipation plate, and the heating electronic component arranged between the front surface and the heat dissipation plate is supported on the front surface; at least part the heating panel with set up in positive at least part the electronic components direct contact generates heat, or at least part the heating panel with set up in positive at least part be provided with heat conduction silicone grease or heat conduction silica gel between the electronic components generates heat, along the direction of height of electric pump, heat conduction silicone grease or heat conduction silica gel's one end with the heating panel contacts, heat conduction silicone grease or heat conduction silica gel's the other end with set up in it is positive the electronic components contact generates heat.

10. The electric pump of claim 8, wherein: the isolation sleeve is made of a metal material; the isolation sleeve is formed by stamping and drawing a metal plate; the thickness value of the isolation sleeve is 0.4mm-1 mm; the isolation sleeve comprises a pump shaft supporting part, the pump shaft supporting part is formed at the bottom and faces towards the electric control board assembly in a protruding mode, the heat dissipation plate is provided with a through hole, the pump shaft supporting part penetrates through the through hole, the pump shaft supporting part is removed, the lower surface of the bottom is in contact with the heat dissipation plate or is removed from the pump shaft supporting part, and heat conduction silicone grease or heat conduction silicone rubber is arranged between the lower surface of the bottom and the heat dissipation plate.

11. The electric pump of claim 9, wherein: the isolation sleeve is made of a metal material; the isolation sleeve is formed by stamping and drawing a metal plate; the thickness value of the isolation sleeve is 0.4mm-1 mm; the spacer sleeve comprises a pump shaft supporting part, the pump shaft supporting part is formed at the bottom, the pump shaft supporting part faces the electric control board assembly in a protruding mode, the heat dissipation board is provided with a through hole, the pump shaft supporting part penetrates through the through hole, the pump shaft supporting part is removed, the lower surface of the bottom is in contact with the heat dissipation board or is removed from the pump shaft supporting part, and heat-conducting silicone grease or heat-conducting silicone rubber is arranged between the lower surface of the bottom and the heat dissipation board.