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Title:
MULTI-STAGE PULSE TUBE REFRIGERATOR AND COLD HEAD OF MULTI-STAGE PULSE TUBE REFRIGERATOR
Document Type and Number:
WIPO Patent Application WO/2020/241377
Kind Code:
A1
Abstract:
A multi-stage pulse tube refrigerator (10) includes a main pressure switching valve (14) for alternately connecting a first-stage cold storage device high-temperature end (16a) to a compressor outlet (12a) and a compressor inlet (12b), and a secondary pressure switching valve (20) for alternately connecting, via a pulse tube communication path (34), both a first-stage pulse tube high-temperature end (18a) and a second-stage pulse tube high-temperature end (24a) to the compressor outlet (12a) and the compressor inlet (12b). The pulse tube communication path (34) has a branch portion (42) between the first-stage pulse tube high-temperature end (18a) and second-stage pulse tube high-temperature end (24a) and the secondary pressure switching valve (20), and branches, at the branch portion (42), to a first pulse tube channel (44) and a second pulse tube channel (46). The first pulse tube channel (44) connects the secondary pressure switching valve (20) to the first-stage pulse tube high-temperature end (18a), and the second pulse tube channel (46) connects the secondary pressure switching valve (20) to the second-stage pulse tube high-temperature end (24a).

Inventors:
XU MINGYAO (JP)
Application Number:
JP2020/019769
Publication Date:
December 03, 2020
Filing Date:
May 19, 2020
Export Citation:
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Assignee:
SUMITOMO HEAVY INDUSTRIES (JP)
International Classes:
F25B9/00
Foreign References:
JP2001272126A2001-10-05
JP2017062064A2017-03-30
US6629418B12003-10-07
JP2013540979A2013-11-07
JP2011094833A2011-05-12
JP2011012925A2011-01-20
Attorney, Agent or Firm:
MORISHITA Sakaki (JP)
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