Electric water pump with a canned motor

Abstract

An electric water pump with a canned motor is provided. The electric water pump includes a can-integrated volute body and a rotor support. The can-integrated volute body includes a volute body part disposed between a water power part housing and a motor housing and a can part disposed between a rotor and a stator. The volute body part separates a water power part from a driving motor and the can part separates the rotor from the stator. The volute body part and the can part may be integrally formed as one continuous piece and the rotor support is disposed inside the volute body part and rotatably supports the rotor and a motor shaft.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims under 35 U.S.C. §119(a) the benefit of Korean Patent Application No. 10-2011-0109754 filed Oct. 26, 2011, the entire contents of which are incorporated herein by reference.BACKGROUND[0002](a) Technical Field[0003]The present invention relates to an electric water pump with a canned motor. More particularly, the present invention relates to an electric water pump with a canned motor, in which a can structure is disposed between a rotor and a stator.[0004](b) Background Art[0005]Water pumps typically circulate cooling water in a vehicle. In a typical vehicle with an internal combustion engine, water pumps may be classified into engine-driven water pumps, which are driven by engine power received through a pulley and a belt and electric water pumps which are driven by electricity.[0006]In an electric water pump, when an electric motor is driven by electricity provided from a battery, an impeller suctions and discharges...

AI Technical Summary

Benefits of technology

The present invention provides an electric water pump with a canned motor that can improve efficiency and reduce the change in the fixed location of an impeller. This is achieved by tightly supporting a motor shaft by a rotor support. Additionally, it is easier to position an O-ring and measure rotation balancing of a rotor assembly when an impeller is assembled into an assembly of a rotor support and a can-integrated voluate body.

Problems solved by technology

Electric water pumps are especially usefully in hybrid vehicles because the engine is not continuously being operated and thus cannot provide a continuous driving force to a mechanical water pump.

Also, since fuel cell vehicles or pure electric vehicles are not equipped with an engine which can drive a water pump, electric water pumps are necessary for circulating cooling water.

However, most of the time electric pumps are used.

However, it is difficult to fix the front bearing 7 supporting the motor shaft 3a, and the number of parts increases when a structure of a front bearing 7 is introduced.

Also, when water is suctioned by rotation of the impeller 5 due to an electromagnetic force generated between the rotor 3 and the stator 4, water may generate a thrust in the axial direction opposite to the suctioning direction of water, which changes the location of the impeller 5 and thus reduces its efficiency.

Furthermore, since an O-ring for maintaining airtightness between the motor housing 6 and the volute chamber and an O-ring for maintaining airtightness between the water power part cover 2a and the volute chamber are difficult to position, the manufacturing process becomes difficult, and a balancing process is almost impossible when the impeller 5 is combined with the motor shaft 3a of the rotor 3.

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