Pulse tube refrigerator

A pulse tube and refrigerator technology, which is applied to refrigerators, gas cycle refrigerators, compressors, etc., can solve the problems of large changes in thermal resistance, deviation of heat exchange performance, and degradation of heat exchange performance of pulse tube refrigerators.

Inactive Publication Date: 2011-07-20
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when such a laminate is filled on the low-temperature end side of the pulse tube to form a heat exchanger, it is difficult to effectively thermally contact the side surface of the laminate with the inner wall of the tank housing the laminate.
Therefore, depending on the contact state of the two, there may be problems such as a large change in the thermal resistance at the interface, a deviation in the heat exchange performance, or a decrease in the heat exchange performance of the pulse tube refrigerator.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0111] In fact, in the tank of the cooling table, under normal conditions, the above-mentioned figure 2 A pulse tube refrigerator with heat exchanger 149b is shown to measure the temperature of the cooling stage. The stack of heat exchangers 149b uses Figure 5 Laminate 150A of the structure shown. As the uppermost wire mesh 153A, a mesh made of SUS304 of #250 was used. In addition, copper wire mesh with mesh #80 is used for the wire mesh after the second grade.

[0112] As a result of the measurement, the temperature of the cooling stage was about 36.4K (Kelvin). On the other hand, in a pulse tube refrigerator equipped with a conventional heat exchanger (having a #80 copper laminated body with a mesh of #80, and the side portion of the laminated body is not diffusely bonded to the inner wall of the tank) in the tank of the cooling stage, the The same measurement was carried out, and the temperature of the cooling stage was about 40.2K (Kelvin).

[0113] From this result...

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PUM

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Abstract

The invention provides a pulse tube refrigerator including a heat exchanger having heat exchangeability better than that of the conventional art. The pulse tube refrigerator, includes a pulse tube; and a regenerator having a low temperature end, the low temperature end being in communication with a low temperature end of the pulse tube via a communicating path, wherein a heat exchanger is provided at the low temperature end side of the pulse tube in the communicating path; the heat exchanger includes a laminated body, the laminated body including at least first and second metal gauzes; the first and second metal gauzes include copper or a copper alloy; interfaces of the metal gauzes are diffusion-bonded to each other; and a side surface of the laminated body is diffusion-bonded to an internal wall forming the communicating path.

Description

technical field [0001] This invention relates to pulse tube refrigerators. Background technique [0002] In the past, pulse tube refrigerators were used to cool devices requiring ultra-low temperature environments, such as nuclear magnetic resonance diagnostic devices (MRI). [0003] In the pulse tube refrigerator, cold is formed at the low-temperature end of the regenerator tube and the pulse tube by repeating the following operations: the operation of the refrigerant gas (for example, helium gas) as the working fluid compressed by the compressor flowing into the regenerator tube and the pulse tube, And the action of discharging the refrigerant gas from the pulse tube and cold storage tube and recovering it to the compressor. [0004] The cold storage tube of the pulse tube refrigerator is composed of a cylindrical member (cylinder) having a cold storage material inside, and the pulse tube is composed of a hollow cylindrical member (cylinder). The low-temperature end of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/00F25B41/04F25B41/06
CPCG01R33/3804F25B9/145F25B2309/1408F25B2309/1415F25B2309/1424G01R33/3815F25B2309/1412
Inventor 高山宽和许名尧
Owner SUMITOMO HEAVY IND LTD
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