Electronic pump

Patent metadata

Field	Value
Publication number	US-10830246-B2
Application number	US-201816215250-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Apr 30, 2015
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

An electronic pump is provided, which includes a rotor assembly. The rotor assembly includes an impeller and a rotor which are separately injection-molded respectively. The material for injection-molding the rotor includes a magnetic material, and the material for injection-molding the impeller does not include a magnetic material. The impeller includes a first fitting portion, the rotor includes a second fitting portion, the impeller and the rotor are cooperated by the first fitting portion and the second fitting portion, and the impeller and the rotor are fixed with respect to each other by a fixing device. In this way, the impeller and the rotor may be made respectively by different materials, and an ordinary plastic material may be employed for the impeller, which may reduce the cost of manufacturing material of the rotor assembly.

First claim

The invention claimed is:

1. An electronic pump, comprising a first housing, a second housing, a rotor assembly, a stator assembly, a shaft and a printed circuit board, a pump chamber comprising a space between the first housing and the second housing, wherein the electronic pump further comprises an partition, and the partition separates the pump chamber into a wet chamber and a dry chamber, the rotor assembly is arranged in the wet chamber, and the stator assembly and the printed circuit board are arranged in the dry chamber, wherein the rotor assembly comprises an impeller, a rotor and a fixing device, the impeller and the rotor are separately formed, the material of the impeller comprises no magnetic material, and the material of the rotor comprises a magnetic material, and the impeller and the rotor are fixed with respect to each other by the fixing device, the impeller comprises blades, a first connecting portion and a second connecting portion, and the blade, the first connecting portion and the second connecting portion are integrated, and the rotor comprises an end and a rotor side wall, the end is arranged at an end of the rotor side wall, the second connecting portion of the impeller comprises a first fitting portion, the end of the rotor comprises a second fitting portion, the impeller and the rotor are cooperated by the first fitting portion and the second fitting portion, and a cooperation of the rotor assembly includes the first fitting portion and the second fitting portion, and the impeller and the rotor are fixedly connected with each other through the fixing device and the cooperation, wherein the blade extends from one surface of the first connecting portion, and the second connecting portion extends from the other surface of the first connecting portion, the extending directions of the blade and the second connecting portion are opposite to each other, the first fitting portion comprises a first sunken portion or a first protrusion, the sunken portion formed from a free end of the second connecting portion to an inside of a body of the second connecting portion, the first protrusion protruding from an end of the second connecting portion; the second fitting portion comprises a second protrusion protruding or a second sunken portion, the second protrusion protruding from the rotor side wall, the second sunken portion formed from a free end of the end to an inside of a body of the rotor, the cooperation comprises the first sunken portion and the second protrusion, or the first protrusion and the second sunken portion,
wherein the second protrusion comprises a top surface, a first surface and a second surface, and an included angle between the first surface and the top surface is substantially 90 degrees, and an included angle between the second surface and the top surface is greater than 90 degrees, the first sunken portion comprises a bottom, a first side and a second side, and an included angle between the first side and the bottom is substantially 90 degrees, and an included angle between the second side and the bottom is greater than 90 degrees, in the case that the rotor assembly is operated, the second surface is in surface contact with the second side, and the first surface and the first side are spaced apart by a certain distance to form a clearance, or the first surface is in contact with the first side, and the second surface and the second side are spaced apart by a certain distance to form a clearance.

2. The electronic pump according to claim 1 , wherein the fixing device comprises an adhesive block formed by an adhesive, and the adhesive have the impeller and the rotor fixedly connected after the adhesive is solidified.

3. The electronic pump according to claim 2 , wherein the clearance is filled with the adhesive, the material of the adhesive includes epoxy.

4. The electronic pump according to claim 2 , wherein the fixing device further comprises a coating layer, and the adhesive forms the coating layer coating an outer surface of the cooperation at least at the outer surface of the cooperation of the rotor assembly.

5. The electronic pump according to claim 3 , wherein the fixing device further comprises a coating layer, and the adhesive forms the coating layer coating an outer surface of the cooperation at least at the outer surface of the cooperation of the rotor assembly.

6. The electronic pump according to claim 1 , wherein the fixing device comprises a wedge, and the wedge is pressed into the clearance from an outer surface of the rotor side wall, two surfaces of the wedged portion are respectively in contact with the first surface and the first side, the second surface and the second side are in surface contact; or the two surfaces of the wedged portion are respectively in contact with the second surface and the second side, the first surface and the first side are in surface contact.

7. The electronic pump according to claim 1 , wherein the fixing device comprises a metal ring, and the metal ring comprises an opening portion, the metal ring is sleeved on the cooperation of the rotor assembly, and is partly arranged into an annular groove formed in the cooperation, and two ends of the opening portion are connected by welding.

8. The electronic pump according to claim 6 , wherein the fixing device comprises a metal ring, and the metal ring comprises an opening portion, the metal ring is sleeved on an outer circumferential surface of the cooperation, the metal sleeve is arranged into an annular groove portion formed in the cooperation, and two ends of the opening portion are connected by welding.

9. The electronic pump according to claim 1 , wherein the electronic pump is applied in an automobile cooling system, the rotor of the rotor assembly is used with the stator assembly, and the rotor is arranged around an outer periphery of the stator assembly.

10. The electronic pump according to claim 1 , wherein the cooperation comprises the first sunken portion and the second protrusion, a circumferential direction of the second connecting portion, the ratio of an arc length of the first sunken portion to an circumference of the second connecting portion is smaller than or equal to ½, and the ratio of an arc length of the second protrusion to an circumference of the second connecting portion is smaller than or equal to ½.

11. The electronic pump according to claim 10 , wherein the first fitting portion comprises a sunken portion formed on the impeller and alternately arranged, the second fitting portion comprises protrusions formed on the end of the rotor; and the protrusion is restricted with the sunken portion by being revolved into or by being translational motion into the sunken portion.

12. The electronic pump according to claim 11 , wherein the impeller and the rotor are separately formed by injection-molding, the impeller is formed by injection molding of a plastic material without a magnetic material, and the rotor is formed by injection-molding of a mixed material including a magnetic material and a plastic material.

Assignees

• Zhejiang Sanhua Automotive Components Co Ltd

Inventors

• Song Hongmin
• Zhang Junchao
• Ye Wei
• Bao Junfeng

Classifications

• F04D13/0673

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

• F05D2260/36

  by a form fit connection, e.g. by interlocking · CPC title

• H02K1/2788

  the rotor consisting of a single magnet or two or more axially juxtaposed single magnets · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• F04D13/0606

  Canned motor pumps · CPC title