Cryogenic refrigerator

Abstract

The invention discloses a cryogenic refrigerator which comprises an air cylinder (9) and a cover body (2) connected to the air cylinder (9), a pushing piston (10) is installed in the air cylinder (9),a connecting rod (4) is installed in the cover body (2) and connected with the pushing piston (10), the connecting rod (4) drives the pushing piston (10) to reciprocate up and down, at the same displacement position, the speed of the connecting rod (4) moving from the top dead center to the bottom dead center is the same as the speed of the connecting rod (4) moving from the bottom dead center tothe top dead center, and the time for the connecting rod (4) to move from the top dead center or the bottom dead center to the balance position is different from the time for the connecting rod (4) to move from the balance position to the bottom dead center or the top dead center. The time for opening a low / high-pressure valve in advance when the pushing piston reaches the bottom / top dead centeris shortened, air capable of generating refrigeration is subjected to more sufficient expansion and compression processes in the air cylinder, a cold cavity and the inside pushing piston, and therefore the refrigeration capacity and the refrigeration efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of low-temperature refrigerators, in particular to a low-temperature refrigerator. Background technique [0002] In general, as a cryogenic cryogenic refrigerator, refrigerators having a sliding piston such as a Gifford-McMahon (GM) cycle refrigerator and a Stirling cycle refrigerator are known. [0003] In the GM refrigerator, the push piston can reciprocate in the cylinder, and the low temperature end in the cylinder reciprocates to form an expansion space. In addition, a large amount of heat exchange material is filled in the push piston, and the gas is cooled by the heat exchange material and expanded and refrigerated at the low temperature end, and the gas flow communicates the expansion space with the room temperature space of the push piston. [0004] The reciprocating motion of the pushing piston relies on the crank-and-rod mechanism at the room temperature end to convert circular motion into axial ...

AI Technical Summary

Problems solved by technology

[0005] It takes time for the valve of the traditional refrigerator to open, to fill the cylinder with high-pressure refrigerant gas or to discharge the gas from the cylinder, and to return to the compressor through the valve, so that the valve must move to the bottom dead center or the top of the piston. Open in advance before the dead point, so that the pressure in the cylinder reaches the set high or low pressure, the process of opening the valve will lead to the loss of refrigeration capacity of the refrigerator

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