A self-regulating throttling refrigerator using memory metal alloy

Abstract

A self-regulating throttling refrigerator using a memory metal alloy. The high-pressure gas tank is connected to the high-pressure gas inlet at one end of the head through the inlet valve, and the other end of the head is fixedly connected with a support body; the gas outlet on the side of the head It is connected to the capillary finned tube spirally wound on the support body, the outlet of the capillary finned tube is connected to the throttling mechanism, the head is arranged at one end of the outer shell, and the other end of the outer shell is provided with a cold plate; the outer shell is provided with The outlet is connected to the exhaust valve outside the outlet; the invention utilizes the shape memory characteristic of the memory alloy as the temperature changes to control the opening of the throttle hole of the refrigerator, thereby realizing the purpose of self-adjustment of the refrigeration flow parameters; memory Compared with elastic materials, thermal expansion materials and electromagnetic materials, the alloy has a larger deformation amount, and is more sensitive to the response to a specific temperature zone. The device of the present invention has a simple structure, is easy to realize, and has good repeatability for repeated use, and can realize precise temperature control. the goal of.

Description

technical field [0001] The invention relates to a self-regulating throttling refrigerator in the technical field of refrigeration. In particular, it relates to a self-regulating throttling refrigerator using a memory metal alloy. The throttling refrigerator uses a throttling hole made of a memory metal alloy to replace a traditional bellows structure to adjust cooling capacity. Background technique [0002] The low-temperature throttling refrigerator uses the throttling and cooling effect of high-pressure gas to realize the cooling of the cooled unit, and is widely used in low-temperature medical equipment, aerospace, military infrared guidance and other civil and national defense fields. In gas liquefaction and cryogenic refrigeration technology, using the actual gas adiabatic throttling effect is one of the most commonly used methods. As early as 1895, a throttling cycle was used for industrial gas liquefaction, and in recent decades, throttling refrigerators for the purp...

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Problems solved by technology

It should be said that this kind of refrigerator is relatively mature in technology and has a wide range of applications, but from the application of existing technologies and statistical analysis, there are two main types of problems: first, the problem of life; according to its design principle , the gas leakage of the bellows adjustment mechanism must be less than the specified value during the design life. Since the gas condition in the closed cavity cannot be accurately detected and controlled during assembly, some products must lose their function due to the gas leakage in the air bag. The life of the product cannot be guaranteed; secondly, the stability problem; because the bellows itself is a thin-walled elastic element, it is difficult to form, and as an inherent property of the elastic element, its own length and rigidity parameters are easy to change, so it is not easy to realize Precise control with poor repeatability

The bellows self-regulating throttling refrigerator has poor stability, is prone to gas leakage, cannot guarantee the service life, and cannot be forced to open after clogging, so finding a new adjustment method has always been an important task for the self-regulating throttling refrigerator. research direction

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