Electronic pump

Patent metadata

Field	Value
Publication number	US-9893587-B2
Application number	US-201514951834-A
Country	US
Kind code	B2
Filing date	Nov 25, 2015
Priority date	Dec 5, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

An electronic pump includes a second housing, a rotor part, a stator part and a circuit board. A pump chamber is separated by a partition into a wet chamber allowing a working medium to pass through and at least one dry chamber where there is no working medium passing through, and the rotor part is arranged in the wet chamber. The electronic pump further includes a shaft, a sunken portion is formed at a top portion of the partition, and the shaft and a bottom of the sunken portion are fixed by injection molding. A portion where the rotor part is in contact with the shaft is a cooperation portion of the rotor part, and the cooperation portion is arranged in a cavity of the sunken portion.

First claim

What is claimed is:

1. An electronic pump, comprising a first housing, a second housing, an end cover, a rotor part, a stator part and a circuit board; the first housing, the second housing and the end cover being fixedly connected to form a pump chamber of the electronic pump, and the pump chamber being divided by a partition into a wet chamber allowing a working medium to pass through and at least one dry chamber where there is no working medium passing through, wherein the rotor part is arranged in the wet chamber, and the stator part and the circuit board are arranged in the dry chamber; the electronic pump further comprises a shaft, and the shaft and the partition are fixed by injection molding; the partition has a partition cavity, the partition comprises a first side wall configured to separate the stator part from the rotor part and a top portion fixed to the shaft, a sunken portion sinking from an exterior of the partition to an interior of the partition is formed at a central area at the top portion of the partition, the sunken portion comprises a second side wall and a bottom, and has a sunken cavity, the stator part is arranged in the partition cavity, the rotor part is arranged outside the partition cavity, and the shaft is fixed to the bottom of the sunken portion; an upper end of the shaft extends out of the partition, the rotor part cooperates with an extending section of the shaft, and a portion of the rotor part of a rotation pair between the rotor part and the shaft is a cooperation portion of the rotor part; the rotor part has a rotor cavity, the cooperation portion comprises a first portion located above a lowest portion of a cavity top surface of the rotor cavity, and a second portion extending from the lowest portion of the cavity top surface into the rotor cavity, and at least a part of the second portion is located in the sunken cavity.

2. The electronic pump according to claim 1 , wherein a length of the rotation pair between the rotor part and the shaft along the direction of the shaft is greater than or equal to a quarter of a height of the rotor part.

3. The electronic pump according to claim 2 , wherein the rotor part comprises a bearing sleeve, and a wheel portion and a rotor portion which are formed by injection molding with the bearing sleeve as an insert, the rotor portion comprises a magnetic part, the bearing sleeve is the cooperation portion of the rotor part, and a length of the bearing sleeve is greater than or equal to one third of the height of the rotor part.

4. The electronic pump according to claim 1 , wherein a fixing strengthening portion for fixing the shaft is formed at the partition, and comprises an annular step enclosing the shaft, and the annular step is formed at the bottom of the sunken portion and protruding to the interior of the partition cavity.

5. The electronic pump according to claim 1 , wherein the stator part includes at least one coil, in an axial direction of the shaft, a plane where the bottom of the sunken portion is located is lower than an outer surface of the coil of the stator part, and an outer diameter of the bottom of the sunken portion is smaller than an inner diameter of the coil, to allow a projection of the sunken portion along the axial direction of the shaft to be located in the coil.

6. The electronic pump according to claim 1 , wherein the second side wall of the sunken portion has a thickness smaller than a thickness of the top portion of the partition, at least one of reinforcing ribs is provided at an outer side of the second side wall and are configured to connect an inner side of the top portion and the second side wall, and the reinforcing ribs start from the second side wall and end at an inner wall of the partition and are divergently arranged.

7. The electronic pump according to claim 4 , wherein an axial column is formed from the bottom of the partition to the interior of the partition cavity, the stator part is sleeved on the axial column and is centrosymmetrically arranged around a central axis of the axial column, and the axial column comprises a part of the shaft and a coating layer of the shaft.

8. The electronic pump according to claim 7 , wherein a center hole is provided at a tail end, provided with the coating layer, of the shaft, and a central axis of the central hole is approximately superposed with the central axis of the shaft.

9. The electronic pump according to claim 8 , wherein a shaft hole is formed in the coating layer corresponding to the central hole of the shaft, the axial column is connected to a screw, and the circuit board and the axial column are fixedly connected via the screw.

10. The electronic pump according to claim 7 , wherein the shaft comprises a shaft fixing portion; a grooved structure, a threaded structure, or a meshed structure is formed on an outer surface of the shaft fixing portion, the partition comprises a partition fixing portion; the shaft and the partition are fixed through the shaft fixing portion and the partition fixing portion, and the partition fixing portion comprises the bottom of the sunken portion, the fixing strengthening portion, and the coating layer.

11. The electronic pump according to claim 9 , wherein the electronic pump further comprises a connection unit; the stator part is fixed in the shaft hole formed by the coating layer along the axial direction of the shaft via the connection unit and a screw, to fix the circuit board to the second housing or the shaft.

12. The electronic pump according to claim 3 , wherein a fixing strengthening portion for fixing the shaft is formed at the partition, and comprises an annular step enclosing the shaft, and the annular step is formed at the bottom of the sunken portion and protruding to the interior of the partition.

13. The electronic pump according to claim 5 , wherein the second side wall of the sunken portion has a thickness smaller than a thickness of the top portion of the partition, at least one of reinforcing ribs is provided at an outer side of the second side wall and are configured to connect an inner side of the top portion and the second side wall, and the reinforcing ribs start from the second side wall and end at an inner wall of the partition and are divergently arranged.

14. The electronic pump according to claim 3 , wherein an axial column is formed from the bottom of the partition to the interior of the partition cavity, the stator part is sleeved on the axial column and is centrosymmetrically arranged around a central axis of the axial column, and the axial column comprises part of the shaft and a coating layer of the shaft.

15. The electronic pump according to claim 4 , wherein an axial column is formed from the bottom of the partition to the interior of the partition cavity, the stator part is sleeved on the axial column and is centrosymmetrically arranged around a central axis of the axial column, and the axial column comprises a part of the shaft and a coating layer of the shaft.

16. The electronic pump according to claim 6 , wherein an axial column is formed from the bottom of the partition to the interior of the partition, the stator part is sleeved on the axial column and is centrosymmetrically arranged around a central axis of the axial column, and the axial column comprises a part of the shaft and a coating layer of the shaft.

17. The electronic pump according to claim 8 , wherein the shaft comprises a shaft fixing portion; a grooved structure, a threaded structure, or a meshed structure is formed on an outer surface of the shaft fixing portion, the partition comprises a partition fixin

Assignees

• Hangzhou Sanhua Res Inst Co Ltd
• Zhejiang Sanhua Automotive Components Co Ltd

Inventors

• Shi Chuliang
• Zhang Junchao
• Zhang Rongrong

Classifications

• F04D13/0633

  Details of the bearings · CPC title

• F04D13/0673

  the motor being of the inside-out type · CPC title

• H02K5/128 Primary

  using air-gap sleeves or air-gap discs · CPC title

• H02K5/1675

  radially supporting the rotary shaft at only one end of the rotor (H02K5/1677 takes precedence) · CPC title

• H02K2005/1287

  Electricity · mapped topic