Pulse tube refrigerator with precooling pulse tube

Abstract

The invention discloses a pulse tube refrigerator with a precooling pulse tube. A compressor, a hot end connecting tube, a heat regenerator hot end heat exchanger, a first heat regenerator, a first cold end heat exchanger, a first pulse tube, a first pulse tube hot end heat exchanger and a first phase modulating device are connected in sequence; a second heat regenerator, a second cold end heat exchanger, a cold end connecting tube, a second pulse tube, a pulse tube precooling heat exchanger, a second pulse tube hot end heat exchanger and a second phase modulating device are connected in sequence; and the pulse tube precooling heat exchanger is connected with the first cold end heat exchanger. In the invention, the pulse tube is provided with the precooling heat exchanger, so that the temperature gradient of the near cold end of the pulse tube is reduced, and heat loss of the pulse tube is reduced; and meanwhile, the precooling heat exchanger can assist the pulse tube to carry away the heat of gas in the tube, so that the refrigerating performance of a cold head is enhanced. For a multi-stage pulse tube refrigerator, the precooling amount of a next stage pulse tube is supplied by a previous stage cold head or heat regenerator, so that the performance of the cold head in a low-temperature region can be enhanced greatly only by using a cold quantity precooling pulse tube with a smaller high-temperature region. The pulse tube refrigerator is easy to operate and implement.

Description

technical field [0001] The invention relates to the technical field of low-temperature refrigeration, in particular to a pulse tube refrigerator with self-precooling pulse tubes. Background technique [0002] The pulse tube refrigerator was born in the 1960s. Compared with the Stirling refrigerator and the G-M refrigerator, the expansion chamber at the cold end of the pulse tube refrigerator is an empty tube without moving parts, and has the advantages of compact structure, high reliability, With the advantages of small vibration and long life, it has been widely used in space technology, national defense, medical treatment and other fields in recent years. Due to the sudden change in the cross-section of the inlet and outlet channels of the vessel and the non-insulation of the wall, there are inevitably circulation losses, resistance losses, heat conduction losses, shuttling losses, and boundary layer pumping losses in the vessel, of which only The non-adiabatic loss (shut...

AI Technical Summary

Problems solved by technology

At present, the flow loss of the vessel can be improved by arranging laminar fluidization elements (such as wire mesh, metal foam layer, etc.) at the inlet and outlet, but there is no effective way to improve the heat loss of the vessel wall

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