Temperature controllable deep cooling treatment system bases on natural circulation

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...

AI Technical Summary

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 control of the cooling rate and the processing temperature, but the radiation cooling method is difficult to achieve a rapid cooling process due to the slow heat transfer rate.

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