(19)
(11) EP 0 399 813 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
06.03.1991 Bulletin 1991/10

(43) Date of publication A2:
28.11.1990 Bulletin 1990/48

(21) Application number: 90305632.3

(22) Date of filing: 23.05.1990
(51) International Patent Classification (IPC)5: F25B 9/14
(84) Designated Contracting States:
DE FR NL

(30) Priority: 23.05.1989 JP 127771/89
23.05.1989 JP 127772/89
13.10.1989 JP 265158/89
13.10.1989 JP 265159/89
17.11.1989 JP 297578/89

(71) Applicant: KABUSHIKI KAISHA TOSHIBA
Kawasaki-shi, Kanagawa-ken 210 (JP)

(72) Inventors:
  • Kuriyama, Toru, c/o Intellectual Property Division
    Minato-ku, Tokyo 105 (JP)
  • Nakagome, Hideki, c/o Intellectual Property Div.
    Minato-ku, Tokyo 105 (JP)
  • Tokai, Yoichi, c/o Intellectual Property Div.
    Minato-ku, Tokyo 105 (JP)

(74) Representative: Freed, Arthur Woolf et al
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)


(56) References cited: : 
   
       


    (54) Cryogenic refrigerator


    (57) A cryogenic refrigerator comprising a closed cylinder (111) provided with an inlet (134) and an outlet (135) for introducing and discharging a coolant gas into and out of the cylinder (111), a displacer (119) slidably housed in the closed cylinder (111) and housing a cooling member (124) therein and having a passage (141) through which the coolant gas flows, a device (142) coaxially arranged in and along the passage (141) of the displacer (119) in which the cooling member (124) is housed to divide the passage (141) into outer and inner ones, a device for reciprocating the displacer (119) in the cylinder (111), and a device for repeating the process of introducing the high pressure coolant gas into the cylinder (111) through the inlet (134) and discharging it out of the cylinder (111), synchronizing with the reciprocating displacer (119).







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