Stirling pulse tube refrigerator connected with displacer

Abstract

The invention discloses a Stirling pulse tube refrigerator connected with a displacer. A cold end of a first-stage pulse tube refrigerator is connected with one end of the displacer; the other end of the displacer is connected with a room temperature end of a second-stage pulse tube refrigerator; one or more second-stage pulse tube refrigerators are connected in parallel, or one or more second-stage pulse tube refrigerators are connected in series; the displacer comprises a free single-piston type displacer, a single-piston supporting type displacer and a double-piston supporting type displacer; the free single-piston type displacer is provided with a piston only; a piston of the single-piston supporting type displacer is arranged on one side of an elastic part, and a connecting rod is arranged on the piston and is connected with the elastic part; and pistons of the double-piston supporting type displacer are arranged on two sides of the elastic part, and a connecting rod is arranged between the two pistons and is connected with the elastic part. Compared with the conventional multi-stage pulse tube refrigerator, the Stirling pulse tube refrigerator is connected with the displacer, so that the system is more compact, phase modulation is flexible and accurate, the loss of acoustical power transmitted among stages is reduced, more acoustical power is transmitted to the next stage, large cold quantity is obtained, and the whole system operates more efficiently.

Description

technical field [0001] The invention relates to the field of cryogenic refrigerators, in particular to a Stirling-type pulse tube refrigerator connected by an ejector. Background technique [0002] The pulse tube refrigerator was invented by Gifford and Longsworth in the United States in the 1960s. The pulse tube refrigerator is a kind of regenerative cryogenic refrigerator, which is composed of a regenerator, a pulse tube, a hot-end heat exchanger, a cold-end heat exchanger, and a phase adjustment device, because it eliminates the motion at low temperature Components, the maintenance-free running time is greatly extended, so it has a very wide application prospect in aerospace, military and other aspects. Pulse tube refrigerators are divided into basic pulse tube refrigerators and phase modulation pulse tube refrigerators. Tube type pulse tube refrigerator, two-way inlet type pulse tube refrigerator and other types. [0003] The basic pulse tube refrigerator uses the adi...

AI Technical Summary

Problems solved by technology

[0005] Pulse tube refrigerators, especially Stirling-type pulse tube refrigerators, use phase modulation devices to improve system performance. Although this will improve the phase between pressure and volume flow rate, it will cause a part of the sound power loss In the phasing device, the sound work entering the system is not fully utilized, and it is for this reason that the cycle efficiency limit of the non-sound work recovery pulse tube refrigerator is T C / T H , which is lower than the limiting cycle efficiency T of the vapor compression refrigeration cycle C / (T H -T C )

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