Temperature controllable deep cooling treatment system bases on natural circulation

A technology of cryogenic treatment and natural circulation, applied in the field of temperature-controlled cryogenic treatment systems, can solve the problems of slow heat transfer rate by radiation cooling method, and it is difficult to achieve rapid cooling, saving liquid nitrogen consumption, facilitating the regulation of treatment temperature, The effect of saving cycle power

Inactive Publication Date: 2007-04-18
ZHEJIANG UNIV
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Problems solved by technology

Compared with the immersion cooling method and the spray cooling method, the radiation cooling method and the forced convection cooling method are easier to realize the ...

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  • Temperature controllable deep cooling treatment system bases on natural circulation
  • Temperature controllable deep cooling treatment system bases on natural circulation
  • Temperature controllable deep cooling treatment system bases on natural circulation

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Embodiment Construction

[0011] The present invention utilizes the difference in the density of liquid nitrogen and gas nitrogen to form a pressure difference to push the liquid nitrogen coolant to circulate, that is, the so-called natural circulation, and the gas nitrogen is generated by the process of cooling workpieces with liquid nitrogen without external heat source. At the same time, the method of combining radiation cooling and forced convection cooling is adopted to realize the control of cooling rate and processing temperature, and ensure the uniform distribution of temperature in the cryogenic processing chamber.

[0012] As shown in Figure 1, the temperature-controllable cryogenic treatment system based on natural circulation is characterized in that it includes a liquid nitrogen storage tank 1, a liquid injection port 2, an infusion valve 3, an infusion tube 4, an insulating layer 5, a cold shield 6, Cryogenic treatment chamber 7, inner coil 8, outer coil 9, inner coil inlet pressure sensor...

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Abstract

The invention discloses a system of treatment by deep cooling with temperature controlling based on natural circulation. The system is composed of liquid nitrogen tank, filling port, perfusion valve, perfusion tube, heat insulating layer, cold shield, treatment room for deep cooling, internal coil, external coil, pressure transducer of internal-coil entry, temperature transducer of internal-coil entry, fan, nitrogen cylinder, reducing valve, injection control valve, injection tube, pressure transducer of external-coil entry, temperature transducer of external-coil entry, temperature transducer in treatment room for deep cooling, reflux control valve, reflux tube, data acquisition of computer and control system. The system depends on pressure-difference resulting from different consistency of liquid nitrogen and gas nitrogen to impel coolant of liquid nitrogen for circular flowing. Adjusting of coefficient of heat transfer on the surface of work is realized conveniently by controlling flux of circulate liquid nitrogen and rotate speed of fan. The system has much strongpoint including saving circulate power and consumption of liquid nitrogen, easy to control cooling speed of treatment by deep cooling and treatment temperature etc.

Description

technical field [0001] The invention relates to a temperature-controllable cryogenic treatment system based on natural circulation. Background technique [0002] Cryogenic treatment, also known as ultra-low temperature treatment, refers to the method of heat treatment of materials below -130°C, and it is a continuation of conventional heat treatment. Cryogenic treatment can improve the wear resistance and toughness of some materials, improve the dimensional stability of the workpiece, and prolong the service life. It is suitable for ferrous metals such as carburizing steel, carbon steel, and alloy steel, and is also suitable for aluminum alloys, copper alloys, Non-ferrous metals such as hard alloys can even be used to improve the mechanical properties of plastics. At present, cryogenic treatment is widely used in industrial production, aerospace industry, military engineering and other fields, mainly for processing tools, molds, measuring tools, friction parts, low-temperat...

Claims

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Application Information

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IPC IPC(8): C21D6/04C22F1/00
Inventor 汤珂金滔夏雨亮许斌陈国邦
Owner ZHEJIANG UNIV
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