Electric pump

1. An electric pump, comprising a pump housing, a rotor assembly, a stator assembly and an electronic control board, wherein

the pump housing is provided with a pump inner chamber, the pump inner chamber comprises a first chamber and a second chamber, the rotor assembly is arranged in the first chamber, and the stator assembly and the electronic control board are arranged in the second chamber; the electric pump comprises an isolation sleeve, at least part of the isolation sleeve is arranged between the rotor assembly and the stator assembly, the first chamber is arranged on one side of the isolation sleeve, and the second chamber is arranged on another side of the isolation sleeve;

the electric pump further comprises a heat dissipation plate, the isolation sleeve comprises a bottom portion, at least part of the heat dissipation plate is arranged between the electronic control board and the bottom portion; and

at least part of the bottom portion is in direct contact with at least part of the heat dissipation plate, or silicone grease or silica gel is filled between at least part of the bottom portion and at least part of the heat dissipation plate, or a heat conducting patch is provided between at least part of the bottom portion and at least part of the heat dissipation plate,

the isolation sleeve is provided with a pump shaft position-limiting portion which protrudes from the bottom portion of the isolation sleeve toward the second chamber and penetrates through the heat dissipation plate, the heat dissipation plate is provided with a through hole corresponding to the pump shaft position-limiting portion, and the pump shaft position-limiting portion is configured to pass through the through hole and be positioned to the heat dissipation plate.

2. The electric pump according to claim 1 , wherein

the electronic control board comprises a base board and electronic components, the base board comprises a front surface and a back surface, the front surface and the back surface are arranged substantially in parallel, the front surface is closer to the isolation sleeve than the back surface, and at least part of the electronic components are arranged on the back surface of the base board; the heat dissipation plate is made of metal; and

at least part of the heat dissipation plate and the front surface are in direct contact, or the silicone grease or the silica gel is filled between at least part of the heat dissipation plate and the front surface, or the heat conducting patch is provided between at least part of the heat dissipation plate and the front surface.

3. The electric pump according to claim 2 , wherein

the heat dissipation plate comprises a first surface;

at least part of the first surface is in direct contact with the front surface, or the silicone grease or the silica gel is filled between at least part of the first surface and at least part of the front surface, or the heat conducting patch is provided between at least part of the first surface and at least part of the front surface; and

an area of the first surface is defined as a first area, a zone of the base board covered by the electronic components is defined as a first zone, an area of the first zone is defined as a second area, and the first area is greater than or equal to the second area.

4. The electric pump according to claim 1 , wherein the electronic control board comprises a base board and electronic components, the base board comprises a front surface and a back surface, the front surface and the back surface are arranged substantially in parallel, the front surface is closer to the isolation sleeve than the back surface, the front surface is arranged opposite to the heat dissipation plate, a gap is formed between the front surface and the heat dissipation plate, at least part of the electronic components are arranged on the front surface, and at least part of the electronic components are located in the gap.

5. The electric pump according to claim 4 , wherein

the electronic components comprise heat-generating electronic components, and at least part of the heat-generating electronic components are arranged on the front surface of the base board;

the heat dissipation plate is made of metal; and

at least part of the heat dissipation plate is in direct contact with at least part of the heat-generating electronic components, or the silicone grease or the silica gel is filled between at least part of the heat dissipation plate and at least part of the heat-generating electronic components, or the heat conducting patch is provided between at least part of the heat dissipation plate and at least part of the heat-generating electronic components.

6. The electric pump according to claim 5 , wherein

the heat dissipation plate comprises a first surface, at least part of the first surface is in direct contact with at least part of the heat-generating electronic components, or the silicone grease or the silica gel is filled between at least part of the first surface of the heat dissipation plate and at least part of the heat-generating electronic components; and

an area of the first surface is defined as a first area, a zone of the base board covered by the heat-generating electronic components is defined as a first zone, an area of the first zone is defined as a second area, and the first area is greater than or equal to the second area.

7. The electric pump according to claim 1 , wherein

the heat dissipation plate and the pump housing are separately arranged, the heat dissipation plate comprises a plurality of through holes, and the through holes are distributed in a circumferential array or evenly distributed; and

the pump housing comprises a plurality of columns, the columns are distributed in the circumferential array or evenly distributed, the columns are integrally formed or fixedly connected with the pump housing, the through holes are arranged corresponding to the columns, and the heat dissipation plate is fixedly connected with the pump housing by riveting the columns.

8. The electric pump according to claim 1 , wherein

the heat dissipation plate and the pump housing are separately arranged, the heat dissipation plate comprises a plurality of through holes, and the through holes are distributed in a circumferential array or evenly distributed; and

the pump housing is formed with a plurality of threaded holes, the threaded holes are distributed in the circumferential array or evenly distributed, the through holes are arranged corresponding to the threaded holes, the electric pump comprises screws or bolts, and the screws or bolts passing through the through holes are in threaded connection with the pump housing having the threaded holes.

9. The electric pump according to claim 1 , wherein the isolation sleeve further comprises a sidewall, the sidewall is configured to isolate the stator assembly from the rotor assembly, and the sidewall is made of metal having low or no magnetic permeability.

10. The electric pump according to claim 9 , wherein the isolation sleeve is made of austenitic stainless steel, the isolation sleeve is formed by stamping and stretching a metal plate, and a thickness of the sidewall is less than or equal to 1.5 mm.

11. The electric pump according to claim 1 , wherein the isolation sleeve further comprises a sidewall, the sidewall is configured to isolate the stator assembly from the rotor assembly, a thickness of the sidewall is less than or equal to a thickness of the bottom portion, the isolation sleeve is made of austenitic stainless steel, the isolation sleeve is formed by stamping and stretching a metal plate, and the thickness of the sidewall is less than or equal to 1.5 mm.

12. The electric pump according to claim 11 , wherein

a lower surface of the bottom portion is in contact with the heat dissipation plate, except for the pump shaft position-limiting portion, or a clearance between the lower surface of the bottom portion and the heat dissipation plate is filled with the silicone grease or the silica gel, except for the pump shaft position-limiting portion, or the clearance between the lower surface of the bottom portion and the heat dissipation plate is provided with the heat conducting patch, except for the pump shaft position-limiting portion.

13. The electric pump according to claim 1 , wherein

the electronic control board comprises the base board and the electronic components, and the base board is connected with the electronic components;

the silicone grease or the silica gel is filled between the base board and the heat dissipation plate, or the heat conducting patch is arranged between the base board and the heat dissipation plate; and

the pump housing comprises a bottom cover, the silicone grease or the silica gel is filled between the bottom cover and the base board, or the heat conducting patch is provided between the bottom cover and the base board.