Electronic water pump magnetic transmission device for automobile

Abstract

The invention discloses an electronic water pump magnetic transmission device for an automobile. The electronic water pump magnetic transmission device comprises a pump head shell and a connecting shell fixed to the rear end of the pump head shell. An inner magnetic ring sleeve and an outer magnetic ring sleeve isolated through a nonmetallic isolating sleeve are arranged in the connecting shell, an outer permanent magnet is attached to the inner circumference of the outer magnetic ring sleeve, and an inner permanent magnet is attached to the periphery of the inner magnetic ring sleeve. The inner magnetic ring sleeve and an impeller arranged in the pump head shell are fixed. A supporting shaft fixed to the nonmetallic isolating sleeve is further included. The electronic water pump magnetictransmission device is characterized in that the inner magnetic ring sleeve is assembled on the supporting shaft through multiple axially distributed ceramic ball bearings, the adjacent ceramic ball bearings abut against each other through gaskets, the outer side of the ceramic ball bearing at the frontmost end abuts against a circle of inner flange formed on the inner magnetic ring sleeve, and the outer side of the ceramic ball bearing at the tail end abuts against an externa thread nut mounted in the inner magnetic ring sleeve. Embedding grooves are formed in the positions, corresponding tothe ceramic ball bearings, of the supporting shaft, and O-shaped rings are embedded. The O-shaped rings are in flexible close fit with the inner rings of the corresponding ceramic ball bearings. The device is low in rotating noise, long in service life and more stable and reliable in operation.

Description

technical field [0001] The invention relates to an electronic water pump magnetic drive device for automobiles. Background technique [0002] Electronic water pumps for automobiles are the key equipment for water circulation, cooling or on-board water supply systems on special vehicles such as new energy vehicles and RVs. The known electronic water pump for automobiles is mainly composed of two parts, a DC brushless motor and a magnetic transmission device. The core structure of the magnetic transmission device is an inner magnetic ring sleeve and an outer magnetic ring sleeve. The outer permanent magnet is attached to the week. The inner magnetic ring sleeve is arranged inside the outer magnetic ring sleeve, and an inner permanent magnet is attached to the outer periphery of the inner magnetic ring sleeve. And the inner and outer magnetic ring sleeves are designed to be separated by a non-metallic spacer sleeve fixed between the connection sleeve and the pump head shell. ...

AI Technical Summary

Problems solved by technology

[0004] 1) The bearings assembled between the inner magnetic ring sleeve and the support shaft are all metal sliding bearings, with round surface contact, large frictional resistance inside the bearing, and short life;

[0005] 2) Metal sliding bearings have poor insulation properties and cannot be immersed in the circulating cooling fluid of hydrogen energy batteries that require strict insulation, and conductive ions will be precipitated;

[0006] 3) There is a gap between the inner ring of the sliding bearing and the surface of the support shaft, which cannot be tightly fitted, resulting in high rotational noise;

[0007] 4) The sliding bearing has axial clearance, which will be damaged by friction

[0008] Especially when the existing electronic water pump for automobiles encounters continuous dry running, the rotation stability will deteriorate, and the rotation noise will increase. After a long time, it will easily cause the failure of the water pump to stall and slow down.

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