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Ultra-low temperature refrigerator

A technology of ultra-low temperature refrigerators and compressors, which is applied in refrigerators, gas cycle refrigerators, refrigeration and liquefaction, etc., and can solve problems such as increased driving torque, refrigerant gas leakage, and synchronous detachment

Active Publication Date: 2016-07-06
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, this GM refrigerator has problems such as its complicated structure and the danger of refrigerant gas leakage in the gas flow path.
[0010] In addition, as the cooling capacity increases with respect to the capacity of the driving source, the driving torque may temporarily increase during the operation cycle.
This is caused by the pressure loss generated in the displacer, and there is a risk that the motor that drives the scotch yoke will be out of sync (slip) due to the increased amount of drive torque.

Method used

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Embodiment Construction

[0040] Next, with Figure 1 Embodiments of the present invention will be described below.

[0041] figure 1 It is a sectional view showing the cryogenic refrigerator according to the first embodiment of the present invention. In this embodiment, a Gifford-McMahon (GM) type refrigerator will be described as an example of a cryogenic refrigerator.

[0042] The GM type refrigerator of this embodiment has a gas compressor 1 and a cold head 2 . The cold head 2 has a housing part 23 and a cylinder part 10 .

[0043] The gas compressor 1 sucks working gas from an intake port connected to a discharge pipe 1b, compresses it, and supplies high-pressure working gas to a supply pipe 1a connected to a discharge port. Helium can be used as the working gas.

[0044] In this embodiment, a two-stage type GM refrigerator is shown, so the cylinder unit 10 has two cylinders, namely, a first-stage cylinder 10a and a second-stage cylinder 10b. The first-stage displacer 3a is inserted and moun...

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Abstract

A cryogenic refrigerator includes a compressor that compresses a working gas; a displacer to which the working gas compressed by the compressor is supplied; a drive mechanism that includes a drive shaft and is configured to drive the displacer; a motor that drives the drive mechanism; a housing that accommodates the drive mechanism; a valve mechanism that adjusts a pressure of the working gas supplied to the displacer; a pipe that supplies the working gas from the compressor to the valve mechanism; and a branch pipe that branches out from the supply pipe and is connected to a space formed between the drive shaft and the housing.

Description

technical field [0001] This application claims priority based on Japanese Patent Application No. 2013-008755 filed on January 21, 2013. The entire content of this application is incorporated in this specification by reference. [0002] The invention relates to an ultra-low temperature refrigerator which drives a displacer through a motor. Background technique [0003] A Gifford-McMahon (GM) refrigerator is known as a refrigerator that generates ultralow temperatures. The GM refrigerator is a refrigerator that uses the volume change of the space produced by the displacer that reciprocates in the cylinder using a drive mechanism, and obtains a cooling effect based on the Gifford-McMahon refrigeration cycle. [0004] Therefore, the high-pressure working gas generated by the compressor is supplied to the displacer using the valve mechanism at a predetermined timing. Furthermore, in order to improve cooling efficiency, a cold storage material is arranged inside the displacer. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/14
CPCF25B9/14F25B2309/001
Inventor 森江孝明许名尧
Owner SUMITOMO HEAVY IND LTD
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