Title:
CRYOGENIC REFRIGERATOR
Document Type and Number:
WIPO Patent Application WO/2019/163742
Kind Code:
A1
Abstract:
A cryogenic refrigerator 10 comprising: a compressor 12; an expansion device 14; a gas line 34 comprising a high-pressure line 35 and a low-pressure line 36; a bypass line 24 connecting the high-pressure line 35 and the low-pressure line 36; and a bypass flow rate control unit 52 for controlling the flow rate of an operating gas flowing through the bypass line 24 so as to provide pressure control for the gas line 34. The bypass line 24 comprises: a variable flow rate bypass 27 equipped with a flow rate control valve 30 and connecting the high-pressure line 35 to the low-pressure line 36; and a fixed flow rate bypass 28 equipped with an on-off valve 32 and connecting the high-pressure line 35 to the low-pressure line 36 in parallel to the variable flow rate bypass 27. The bypass flow rate control unit 52 controls the flow rate of the operating gas flowing through the bypass line 24 through a combination of adjusting the degree of opening of the flow rate control valve 30 and switching the on-off valve 32.
Inventors:
OYAMA SHUJI (JP)
Application Number:
PCT/JP2019/006007
Publication Date:
August 29, 2019
Filing Date:
February 19, 2019
Export Citation:
Assignee:
SUMITOMO HEAVY INDUSTRIES (JP)
International Classes:
F25B9/00; F25B9/06
Foreign References:
| JP2004085048A | 2004-03-18 | |||
| CN204115161U | 2015-01-21 | |||
| CN201548001U | 2010-08-11 | |||
| CN106595126A | 2017-04-26 | |||
| JP2011005091A | 2011-01-13 | |||
| JP2011141074A | 2011-07-21 | |||
| JP2014523994A | 2014-09-18 | |||
| JPH0252061U | 1990-04-13 | |||
| JPS54181359U | 1979-12-21 | |||
| JPS5314447A | 1978-02-09 |
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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