(19)
(11) EP 1 985 946 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.06.2009 Bulletin 2009/25

(43) Date of publication A2:
29.10.2008 Bulletin 2008/44

(21) Application number: 07001035.0

(22) Date of filing: 18.01.2007
(51) International Patent Classification (IPC): 
F25B 30/02(2006.01)
F22B 3/04(2006.01)
 F01D 25/22(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 27.02.2006 JP 2006049474

(71) Applicant: HITACHI, LTD.
Chiyoda-ku Tokyo 100-8280 (JP)

(72) Inventors:
  • Shibata, Takanori c/o Hitachi Ltd. Intellectual
    1-6-1 Marunouchi Chiyoda- Tokyo 100-8220 (JP)
  • Hatamiya, Shigeo c/o Hitachi Ltd. Intellectual
    1-6-1 Marunouchi Chiyoda- Tokyo 100-8220 (JP)
  • Fukushima, Toshihiko c/o Hitachi Ltd. Intellectual
    1-6-1 Marunouchi Chiyoda- Tokyo 100-8220 (JP)

(74) Representative: Beetz & Partner 
Patentanwälte Steinsdorfstrasse 10
80538 München
80538 München (DE)

   


(54) Heat pump system, method for adjusting temperature of lubricating water in heat pump system, and method for operating heat pump system


(57) A heat pump system, a method for adjusting a temperature of lubricating water in a heat pump system, and a method for operating a heat pump system, which suppress boiling of lubricating water for bearings (51) and thereby minimize the deterioration in reliability of the bearings (51). A heat pump system comprising an evaporator (42) for generating steam, and a compressor (34) including a first stage (33) and second stage (32) as a plurality of compression means for compressing the steam, wherein bearings (51) for supporting the compressor (34) are water bearings, and lubricating water in each of the water bearings (51) is controlled to a temperature less than a saturation temperature associated with an internal pressure of each water bearing (51)







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