(19)
(11) EP 2 320 162 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.02.2015 Bulletin 2015/08

(43) Date of publication A2:
11.05.2011 Bulletin 2011/19

(21) Application number: 10009563.7

(22) Date of filing: 14.09.2010
(51) International Patent Classification (IPC): 
F25B 9/14(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 14.09.2009 JP 2009212348

(71) Applicant: Sumitomo Heavy Industries, Ltd.
Tokyo 141-6025 (JP)

(72) Inventors:
  • Ishizuka, Masayuki
    Yokosuka-shi Kanagawa 237-8555 (JP)
  • Tateishi, Yuichi
    Yokosuka-shi Kanagawa 237-8555 (JP)
  • Xu, Mingyao
    Nishitokyo-shi Tokyo 188-8585 (JP)
  • Nakano, Kyosuke
    Nishitokyo-shi Tokyo 188-8585 (JP)

(74) Representative: Wagner, Karl H. 
Wagner & Geyer Partnerschaft Patent- und Rechtsanwälte Gewürzmühlstrasse 5
80538 München
80538 München (DE)

   


(54) Regenerative refrigerator


(57) A regenerative refrigerator includes a compressor compressing working fluid; a cylinder fed with the compressed working fluid, containing a regenerator material, and having an expansion space; and a rotary valve to switch a first passage and a second passage formed to cause the working fluid to flow from the compressor to the expansion space and from the expansion space to the compressor, respectively. The working fluid expands in the expansion space to generate cold temperatures in the cylinder. The rotary valve includes a valve body having a first flat surface; and a valve plate having a second flat surface and configured to rotate with the first and second flat surfaces in surface contact.
One of the first and second flat surfaces has an arithmetic average roughness of 0.1 µm to 0.9 µm. The other one of the first and second flat surfaces includes resin.







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Search report