Magnetic coupling pump

Abstract

A magnetic coupling pump according to the present invention has a housing including a pump chamber a motor chamber. The rotor includes a plurality of impellers projected from top face of a substantially disc-shaped main body of the rotor to be located in the pump chamber, and a substantially cylindrical magnet section projected from back face of the main body to be located in the motor chamber. The rotor is located in engine coolant, and is driven by a stator located inward of the magnet section in the motor chamber for sucking coolant from an inlet port and exhausting it from an outlet port. The pump is provided along an inner circumference of the stator with a cavity communicating with passages of fluid along an inner circumference of the magnet section and the back face of the main body of the magnet section. The cavity admits the coolant. The pump according to the present invention is able to prevent heat-up in the inner circumferential part of the stator.

Description

[0001] The present application claims priority from Japanese Patent Application No. 2003-142389 of Hatano, filed on May 20, 2003, the entirety of which is hereby incorporated into the present application by reference.[0002] 1. Field of the Invention[0003] The present invention relates to a magnetic coupling pump for pumping fluids such as engine coolant for vehicles, and more particularly, relates to an outer-rotor type magnetic coupling pump in which a stator is located toward a rotation center of a rotor having impellers for feeding fluids, and a substantially cylindrical magnet section of the rotor is located around the stator.[0004] 2. Description of the Related Art[0005] In conventional outer-rotor type magnetic coupling pumps for engine coolant for vehicles, a rotor having impellers for feeding coolant is located in a housing, as disclosed in Japanese Laid Open Patent Application No. JP10-311290.[0006] In this magnetic coupling pump, the housing includes a pump chamber having ...

AI Technical Summary

Problems solved by technology

In the conventional outer-rotor type magnetic coupling pump, however, there is no means of cooling down a part inward of the stator though the outer circumference of the stator can be cooled down by coolant interposed between the stator and the magnet section.

Consequently, burnout of the coils of the stator and heat deformation of the housing are properly prevented, which further elongates a life span of the pump even under high-load driving which consumes a lot of electricity.

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