Electric pump

Patent metadata

Field	Value
Publication number	US-12562624-B2
Application number	US-202117928668-A
Country	US
Kind code	B2
Filing date	Jul 2, 2021
Priority date	Jul 3, 2020
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

An electric pump includes a stator assembly. The stator assembly includes a stator core and a winding. The winding includes a main body section, a first section, and a second section. The stator core includes a core tooth portion, a core yoke portion, and a core neck portion. A first reference plane is defined, which coincides with a center axis line of the core tooth portion in an axial direction thereof and a center axis line of the core neck portion in an axial direction thereof. In a cross section of the stator assembly along the first reference plane, an upper end of the main body section is level with an upper end of a main body portion of the core yoke portion, and a lower end of the main body section is level with a lower end of the main body portion of the core yoke portion.

First claim

The invention claimed is:

1 . An electric pump, comprising: a stator assembly, wherein the stator assembly comprises a stator iron core and a winding, wherein the winding comprises a main body section, a first section and a second section, wherein the first section is connected to the second section by the main body section, and the first section is located above the second section; the stator iron core comprises an iron core toothed portion, an iron core yoke portion and an iron core neck portion, wherein the iron core toothed portion is connected to the iron core yoke portion by the iron core neck portion, the iron core yoke portion is farther away from a center axis of the stator iron core than the iron core toothed portion, the iron core yoke portion is located on an outer circumference of the winding, and the iron core neck portion is configured to provide support for the winding to wind; wherein an upper end of the main body section is flush with an upper end of a body portion of the iron core yoke portion, and a lower end of the main body section is flush with a lower end of the body portion of the iron core yoke portion; the electric pump further comprises a shield member, wherein the shield member is made of a conductive metal, and at least part of the shield member is located on an outer circumference of at least one of the first section and the second section,
wherein the shield member comprises a cylinder portion and a cover portion, wherein the cylinder portion is connected t the cover portion, and the cylinder portion is arranged around the outer circumference of at least one of the first section and the second section; wherein an Insulating frame comprises a first blocking portion, a second blocking portion and a winding portion, wherein at least part the stator iron core is located between the first blocking portion and the second blocking portion, the first blocking portion, the stator Iron core and the second blocking portion are distributed along an axial direction of the electric pump, and the winding is wound on the winding portion; the first blocking portion is connected to an end of the top of the winding portion, and the second blocking portion is connected to an end of a bottom of the winding portion; and at least part of the shield member is located on an outer circumference of at least one of the first blocking portion and the second blocking portion, wherein the cover portion comprises a first surface and a second surface, wherein the second surface is closer to the winding than the first surface: the electric pump further comprises a first elastic pad, wherein at least part of the first elastic pad is located between the second surface and the insulating frame; and at least one of the insulating frame and the second surface abuts against an end surface of the first elastic pad.

2 . The electric pump according to claim 1 , wherein the shield member arranged on the outer circumference of the first section is defined as a first shield member when at least part of the shield member is arranged on the outer circumference of the first section, the cylinder portion of the first shield member is defined as a first cylinder portion, the cover portion of the first shield member is defined as a first cover portion, the first cylinder portion is arranged around the outer circumference of the first section, and the first cover portion covers at least the top of the first section;
the shield member arranged on the outer circumference of the second section is defined as a second shield member when at least part of the shield member is arranged on the outer circumference of the second section, the cylinder portion of the second shield member is defined as a second cylinder portion, the cover portion of the second shield member is defined as a second cover portion, the second cylinder portion is arranged around the outer circumference of the second section, and the second cover portion covers at least the bottom of the second section.

3 . The electric pump according to claim 1 , wherein the electric pump further comprises a rotor assembly and an isolation portion, wherein the electric pump comprises a pump inner chamber, the pump inner chamber comprises a first chamber and a second chamber, the first chamber is located on one side of the isolation portion, the second chamber is located on another side of the isolation portion, the rotor assembly is located in the first chamber, and the stator assembly is located in the second chamber; the electric pump further comprises a second elastic pad, wherein one end of the second elastic pad abuts against the first surface, another end of the second elastic pad abuts against the isolation portion, and the second elastic pad is pressed along the axial direction of the electric pump by a positive pressure acting on the second elastic pad through the isolation portion.

4 . The electric pump according to claim 1 , wherein the electric pump comprises a first housing, the first housing comprises an accommodating chamber, at least part of the stator assembly is located in the accommodating chamber, the electric pump further comprises a second elastic pad, one end of the second elastic pad abuts against the first surface, another end of the second elastic pad abuts against the first housing, and the second elastic pad is pressed along the axial direction of the electric pump by a positive pressure acting on the second elastic pad through the first housing.

5 . The electric pump according to claim 3 , wherein the cover portion comprises a plurality of first through holes, the plurality of first through holes extend through an upper surface and a lower surface of the cover portion; the first elastic pad and the second elastic pad are formed by injection molding with at least the shield member as an insert, the first elastic pad and the second elastic pad are connected by a connecting portion, and at least part of the connecting portion is located in the plurality of first through holes.

6 . The electric pump according to claim 2 , wherein the iron core yoke portion further comprises a protruding portion, wherein the protruding portion protrudes from an outer circumferential surface of the body portion of the stator iron core along a radial direction of the stator iron core; the cylinder portion comprises a notch portion, the notch portion extends through an outer circumferential surface and an inner circumferential surface of the cylinder portion along a radial direction of the shield member, wherein along an axial direction of the shield member, a notch of the notch portion faces the stator iron core, at least part of the protruding portion is located in the notch of the notch portion, and a gap is defined between a side surface of the notch portion and a side surface of the protruding portion.

7 . The electric pump according to claim 1 , wherein the electric pump comprises a first housing, wherein the first housing comprises an accommodating portion, at least part of the stator assembly is located in a chamber of the accommodating portion, and the first housing is formed by injection molding with at least the shield member as an insert; the shield member comprises a cylinder portion, and the cylinder portion is arranged around the outer circumference of at least one of the first section and the second section.

8 . The electric pump according to claim 7 , wherein the cylinder portion is arranged around the outer circumference of the first section; a side wall of the accommodating portion comprises a first side wall and a second side wall, wherein the first side wall is located above the second side wall, and a diameter of the first side wall is larger than a diameter of the second side wall; the first housing comprises a

Assignees

• Zhejiang Sanhua Automotive Components Co Ltd

Inventors

• Fu Binhao
• Zhang Ying
• Zhang Jun
• Sun Yongfeng
• Cai Longji

Classifications

• H02K11/01

  for shielding from electromagnetic fields {, i.e. structural association with shields} (means for preventing or reducing eddy-current losses in the winding heads by shielding H02K3/42) · CPC title

• H02K11/014

  Shields associated with stationary parts, e.g. stator cores · CPC title

• F04D13/06

  the pump being electrically driven · CPC title

• F04D13/064

  Details of the magnetic circuit · CPC title

• H02K5/12

  specially adapted for operating in liquid or gas (combined with cooling arrangements H02K9/00) · CPC title