G-M refrigerator with phase modulating mechanism

Abstract

The invention relates to a G-M refrigerator with a phase modulating mechanism, which comprises a compressor (1), an air inlet valve (2), an exhaust valve (3), a heat regenerator (4), a cylinder (5), a piston (6), a hot cavity (7), a cold cavity (8), a sealing ring (9), driving mechanisms (10-12), an annular gap (13), a heat exchanger (14), an orifice valve (18) and an air reservoir (19). By introducing the phase modulating mechanisms, such as the orifice valve (18), the air reservoir (19) and the like, the working mode of gas in the annular gap (13) is changed to be identical to that of a vascular refrigerator with the phase modulating mechanism, a cooling effect is generated by fully utilizing the working doing through the expansion of the part of gas, and the gas leakage through the sealing ring (9) is eliminated, thereby improving the performance of the G-M refrigerator.

Description

technical field

[0001] The invention relates to a low-temperature refrigerator, in particular to a regenerative low-temperature refrigerator, in particular to a G-M refrigerator with a phase adjustment mechanism. Background technique

[0002] The G-M refrigeration cycle was jointly invented by Gifford and Mcmahon, and its principle is to use an adiabatic gas to deflate for refrigeration. Currently, G-M refrigerators have been widely used in cryopumps and cooling a variety of superconducting magnets. In application, the cold head of the refrigerator is generally used in direct contact or a material with high thermal conductivity is used as a thermal bridge to achieve cooling.

[0003] At present, there is a gap between the cylinder wall and the piston of the commonly used G-M refrigerator, and the pressure in the refrigerator changes periodically, and the gap will cause pump air loss. The hot ends of the piston and cylinder are sealed with sealing rings, while the cold ends...

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