Magnetic refrigerating device based on repetitive pulsed magnetic field

Abstract

The invention discloses a magnetic refrigerating device based on a pulsed magnetic field. The device comprises a repetitive pulsed power supply without a continuous loop, a pulsed magnet, a magnetic refrigeration working medium, a hot end heat exchange unit and a cold end heat exchange unit, wherein the repetitive pulsed power supply discharges to the pulsed magnet, and part of electric energy flows back to the repetitive pulsed power supply to achieve energy recovery; during the discharge process, the pulsed magnet generates the pulsed magnetic field and causes the refrigeration working medium to magnetize and release heat, and the heat generated by the magnetic working medium is transferred to a high-temperature heat source through the hot end heat exchange unit; after the discharge is finished, the repetitive pulsed power supply is shut off, and the pulsed magnet stops generating the pulsed magnetic field, and the magnetic refrigeration working medium demagnetizes and absorbs the heat, and through heat absorption of a low-temperature heat source by the cold end heat exchange unit, the temperature of the low-temperature heat source is lowered, thus completing a discharge refrigeration cycle; and the discharge refrigeration cycle is circulated in a manner above to realize continuous refrigeration. According to the scheme disclosed by the invention, the controllable pulsed magnet generates the intermittent repetitive pulsed magnetic field to achieve the magnetic refrigeration, and the magnetic refrigerating device has the characteristics of high magnetic field intensity, no moving part, convenience and fastness of control, high efficiency and high refrigeration power.

Description

technical field [0001] The invention relates to the field of applied magnetic refrigeration, in particular to a magnetic refrigeration device based on a repetitive pulse magnetic field, which is used for refrigeration at room temperature or in a relevant industrial application temperature range. Background technique [0002] Refrigeration technology is indispensable for the development of modern industry and the needs of life. Traditional gas compression refrigeration has greatly promoted modern industry and life, but the environmental pollution and energy crisis that come with industrialization have greatly hindered its pace. Because of the damage to the ozone layer, the Montreal Protocol stipulates that the production and use of Freon have been completely stopped by the year 2000. The vigorous development of fluorine-free working fluids has brought new impetus to the refrigeration industry. However, many gases still leak, are toxic, flammable, explosive, and even produce ...

AI Technical Summary

Problems solved by technology

Although this kind of magnetic refrigerator with iron core excitation is easy to control and adjust, but because the iron core is saturated and the excitation current intensity is limited by the heating of the coil, the magnetic field intensity cannot be high, and the strong magnetic field necessary to realize the effective magnetic refrigeration cycle cannot be generated. Therefore, domestic and foreign There is little further research

[0007] Generally speaking, the current disadvantages of magnetic refrigeration devices in the world lie in the following aspects: 1) The magnetic field strength of the permanent magnet block is low, and the cost of superconducting magnets is too expensive; part

Among the very few magnetic refrigeration prototypes that do not require moving parts, superconducting magnets are expensive to manufacture, require high operation and maintenance, and the magnetic field of the iron core excitation method is too low to effectively stimulate the magnetocaloric effect; 3) The control of the lifting magnetic system and the heat exchange system is complicated; 4 ) The existing magnetic refrigeration device has large energy loss, low efficiency and low refrigeration power

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