Pneumatic GM refrigerating machine and control process thereof

Abstract

The invention relates to a pneumatic GM refrigerating machine and a control process thereof. The pneumatic GM refrigerating machine comprises a driving cylinder, a refrigerating cylinder, a driving piston, a push piston and a refrigeration capacity heat exchanger, wherein the driving cylinder is vertically connected with the refrigerating cylinder, the driving piston is vertically connected with the push piston, the driving piston can slide in the driving cylinder, a driving cavity is formed between the driving cylinder and the driving piston, the push piston can slide in the refrigerating cylinder, the inner part of the refrigerating cylinder is divided into a room temperature cavity and a low temperature cavity by the push piston, the refrigeration capacity heat exchanger is connected with the lower temperature cavity, the room temperature cavity is connected with a low-pressure gas pipeline and a high-pressure gas pipeline, the driving cavity is at least connected with a low-pressure gas storage and a high-pressure gas storage. Compared with the prior art, on the basis of the original GM refrigerating machine, the low-pressure gas storage and the high-pressure gas storage are arranged on the driving cavity, the movement of the piston is driven to move by the gas in the gas storages, so that the refrigerating efficiency of the refrigerating machine is increased. The pneumatic GM refrigerating machine is simple in structure and easy to operate.

Description

technical field [0001] The invention relates to a low-temperature refrigerator, in particular to a pneumatic GM refrigerator and its control process. Background technique [0002] The GM refrigerator is a low-temperature refrigerator that utilizes high-pressure gas for refrigeration. Usually the high pressure gas is helium. The high-pressure air source and the low-pressure air source are respectively communicated through the switching valve, so that the high-pressure gas flows into the refrigerator for expansion and cooling, and then flows into the low-pressure air source. The gas source is usually a GM compressor with a high pressure gas outlet and a low pressure gas inlet. In a conventional pneumatic GM refrigerator, the movement of the pushing piston is driven by the high-pressure gas from the compressor through the driving piston. Although the structure is simple, it consumes part of the high-pressure gas from the compressor, so the efficiency is low. If there is only...

AI Technical Summary

Problems solved by technology

In a conventional pneumatic GM refrigerator, the movement of the pushing piston is driven by the high-pressure gas from the compressor through the driving piston. Although the structure is simple, it consumes part of the high-pressure gas from the compressor, so the efficiency is low

If there is only one gas store, although the gas used to control the moving piston is not needed, there is a large irreversible loss in the refrigeration process of the gas from the compressor, and the theoretical efficiency is low

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