(19)
(11) EP 2 863 151 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.07.2015 Bulletin 2015/31

(43) Date of publication A2:
22.04.2015 Bulletin 2015/17

(21) Application number: 14188877.6

(22) Date of filing: 14.10.2014
(51) International Patent Classification (IPC): 
F25B 1/10(2006.01)
F25B 41/00(2006.01)
 F25B 31/00(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 RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 18.10.2013 JP 2013216944

(71) Applicant: MITSUBISHI HEAVY INDUSTRIES, LTD.
Tokyo 108-8215 (JP)

(72) Inventors:
  • Miyamoto, Yoshiaki
    TOKYO, 108-8215 (JP)
  • Kimata, Yoshiyuki
    TOKYO, 108-8215 (JP)
  • Hotta, Youhei
    TOKYO, 108-8215 (JP)
  • Sato, Hajime
    TOKYO, 108-8215 (JP)

(74) Representative: Intès, Didier Gérard André et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cedex 07
75340 Paris Cedex 07 (FR)

   


(54) Two-stage compression cycle


(57) An object is to provide a two-stage compression system that has no need for oil equalization between a lower-stage compressor and a higher-stage compressor, which makes it possible to simplify the configuration, and that makes it possible to reliably ensure appropriate oil levels in both the lower-stage compressor and the higher-stage compressor. In a two-stage compression system (1) in which a lower-stage compressor (2) and a higher-stage compressor (3) are disposed in series, and an oil separator (7) is provided on a discharge side of the higher-stage compressor (3), a first oil-returning circuit (11) and a second oil-returning circuit (12), which are independent of each other, are provided so as to be connected between the oil separator (7) and the lower-stage compressor (2) and the higher-stage compressor (3), and V1 > V2 is satisfied, assuming that the volume of oil returned to the lower-stage compressor (2) from the first oil-returning circuit (11) is V1, and the volume of oil returned to the higher-stage compressor (3) from the second oil-returning circuit (12) is V2.







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