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Multistage Stirling type pulse tube refrigerator

A pulse tube refrigerator and pulse tube technology, which are applied in refrigerators, gas cycle refrigerators, refrigeration and liquefaction, etc., can solve the problems of not being able to take both

Active Publication Date: 2015-05-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, between phase modulation and input work distribution, the existing stepped piston type phase shifter cannot take care of both

Method used

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  • Multistage Stirling type pulse tube refrigerator
  • Multistage Stirling type pulse tube refrigerator
  • Multistage Stirling type pulse tube refrigerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Three-stage piston pre-cooling pulse tube refrigerator, the structure is as follows figure 1 As shown, it includes a three-stage stepped piston system 4a, a compressor 5 and a three-stage pre-cooling cold head 1a.

[0025] The three-stage pre-cooling cold head 1 a includes a first-stage cold head 11 , a first-stage cold head 12 and a third-stage cold head 13 .

[0026] The first-stage cold head 11 is composed of a first-stage connecting pipe 101, a first-stage cooler 102, a first-stage regenerator 103, a first-stage cooling heat exchanger 111, a first-stage pulse pipe 112, a first-stage pulse The gas homogenizer 113 at the hot end of the tube and the first-stage vessel connecting pipe 114 are connected accordingly, and the first-stage vessel connecting pipe 114 has a first-stage adjustment chamber 115 on it. Gas can flow back and forth between the various components.

[0027] The second-stage cold head 12 is composed of a second-stage connecting pipe 201, a second-sta...

Embodiment 2

[0048] Two-stage stepped piston precooling pulse tube refrigerator, the structure is as follows figure 2 As shown, it includes a two-stage stepped piston system 4b, a compressor 5 and a two-stage pre-cooling cold head 1b.

[0049] The two-stage pre-cooling cold head 1 b includes a first-stage cold head 11 and a second-stage cold head 12 .

[0050] and figure 1 Compared with the second-stage pre-cooling cold head 1b, the third-stage cold head is missing, and the step-push piston and step cylinder of the two-stage step-push piston system 4b have become two-stage step push piston 461b and two-stage step cylinder 462b. The two-stage stepped push piston 461b and the two-stage stepped cylinder 462b form the first working chamber 41 of the pushing piston and the second working chamber 42 of the pushing piston.

[0051] Such as figure 2 As shown, there may be two adjustment chambers or only one adjustment chamber in the two-stage stepped piston pre-cooling pulse tube refrigerator...

Embodiment 3

[0055] Three-stage stepped piston-coupled pulse tube refrigerator, such as image 3 As shown, it includes a three-stage stepped piston system 4a, a compressor 5 and a three-stage coupled cold head 1c.

[0056] The three-stage coupled cold head 1c includes a first-stage cold head 11, a second-stage coupled cold head 12b, and a third-stage coupled cold head 13b.

[0057] The second-stage coupling cold head 12b is composed of a second-stage cold connection pipe 221, a second-stage second regenerator gas homogenizer 222, a second-stage second regenerator 206, a second-stage cooling heat exchanger 211, and a second-stage second regenerator 206. The second-stage vessel 212 , the hot-end gas homogenizer 213 of the second-stage vessel and the second-stage vessel connection pipe 214 are sequentially connected, and the second-stage vessel connection pipe 214 is connected with a second-stage adjustment cavity 215 . Gas can flow back and forth between the various components.

[0058] Th...

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PUM

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Abstract

The invention relates to a multistage Stirling type pulse tube refrigerator. The multistage Stirling type pulse tube refrigerator comprises a compressor, n stages of cooling heads and n stages of ladder push piston systems, wherein n is an integer larger than 1, each cooling head comprises a cooler, a heat regenerator, a cooling heat exchanger and pulse tubes, the cooling heat exchanger of the n stage of cooling head serves as the n stage of cooling capacity output end, a compression cavity of the compressor is connected with coolers in the cooling heads, push piston working cavities of the n stages of ladder push piston systems are respectively connected with the pulse tubes, push piston back working cavities of the n stages of ladder push piston systems are communicated with the compression cavity of the compressor, wherein a regulating cavity is connected between the pulse tube of at least one stage of cooling head and the connected ladder push piston working cavity. Compared with the prior art, the multistage Stirling type pulse tube refrigerator enables the gas flow rate and pressure of the cold ends of the pulse tubes to work at the best phase angles through regulating the volume of the cavity, and meanwhile, the multistage Stirling type pulse tube refrigerator gives consideration to the input power distribution of each stage, and moreover, the expansion power can be recycled, and the theoretical efficiency is the same with that of a Carnot engine.

Description

technical field [0001] The invention relates to a pulse tube refrigerator, in particular to a multistage Stirling type pulse tube refrigerator. Background technique [0002] The Stirling-type pulse tube refrigerator has no moving parts at low temperatures, and its compressor can be suspended by a linear motor and a leaf spring, so that the compressor has a long life and high efficiency. In the 77K refrigeration temperature range, among the existing small cryogenic refrigerators, the Stirling pulse tube refrigerator has the highest lifespan and the highest efficiency. In order to obtain low temperature, such as 20-4K refrigeration temperature, a multi-stage pulse tube refrigerator is necessary. At present, the two-stage Stirling-type pulse tube refrigerator has been put into practical use in the 35K temperature range. In the 20K temperature zone, it is difficult to lower the temperature and improve the efficiency. 20K is the liquid hydrogen temperature zone, which has very...

Claims

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Application Information

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IPC IPC(8): F25B9/14
CPCF25B9/145F25B2309/14
Inventor 朱绍伟
Owner TONGJI UNIV
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