Magnetic Convection Heat Circulation Pump

Abstract

A magnetic convection heat circulation pump, wherein magnets are disposed inside a magnetic field flow passage for passing a magnetic fluid therein or on a part of the inner wall surface of a circulation flow passage in a magnetic pump thermally joined to a heat receiving part. The magnetic fluid is driven since a magnetic force is directly applied to the magnetic fluid and a large temperature gradient is produced between the heat receiving part and the magnetic pump due to a difference between a heat quantity transferred from the heat receiving part indirectly to the magnetic pump and the heat quantity of the magnetic fluid led into the magnetic pump.

Description

TECHNICAL FIELD[0001]The present invention relates to a device for transferring heat energy. More particularly, it relates to a magnetic convection heat circulation pump which utilizes a magnetic fluid exhibiting temperature-dependent saturation magnetization.[0002]Heat transfer devices utilizing magnetic convection of a magnetic fluid exhibiting temperature-dependent saturation magnetization have long been known, but they have not been put into commercial practice for several reasons including the difficulty of producing of a magnetic fluid having uniform distribution of finely divided ferromagnetic particles of little or no residual magnetism.[0003]Attempts have been made to obviate the above problems in recent years. For example, JP 10 / 231814A discloses a fluid flow control device utilizing a paramagnetic gas exhibiting temperature-dependent saturation magnetization, while JP 3 / 102804A discloses a heat transfer device utilizing a magnetic fluid exhibiting temperature-dependent sa...

AI Technical Summary

Benefits of technology

[0008]In the magnetic convection heat circulation pump of the present invention, the magnetic fluid in the fluid circulation path receives heat in said heat receiving section to decrease the magnitude of saturation magnetization in response to the magnetic field applied to the fluid circulation path and tends to displace in the fluid circulation path toward the heat discharging section creating magnetic convection. Therefore, the pump is simple in structure, operates as far as a temperature differential is present between the heat receiving and discharging sections, and has an advantage of transferring a large quantity of heat by circulating the magnetic fluid as fast as possible using a large temperature differential.

Problems solved by technology

Heat transfer devices utilizing magnetic convection of a magnetic fluid exhibiting temperature-dependent saturation magnetization have long been known, but they have not been put into commercial practice for several reasons including the difficulty of producing of a magnetic fluid having uniform distribution of finely divided ferromagnetic particles of little or no residual magnetism.

However, the devices having external heating means have only limited uses and are not suitable for cooling an object.

However, the system is complicated and expensive because of the controller and requisite wiring.

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