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Patent Searching and Data


Title:
HEAT PUMP SYSTEM, AND HEAT PUMP WATER HEATER
Document Type and Number:
WIPO Patent Application WO/2015/045247
Kind Code:
A1
Abstract:
 Provided is a two-stage compression heat pump with which the amount of refrigerant oil in the two compressors is easily kept uniform. The system is provided with: a compression mechanism (10) provided with a lower stage-side compressor (10a) and a higher stage-side compressor (10b), for compressing and discharging a refrigerant; a water-refrigerant heat exchanger (11) for heat exchange between a target to undergo heat exchange and the refrigerant compressed by the compression mechanism (10); an expansion valve (12) for decompression and expansion of the refrigerant outflowing from the water-refrigerant heat exchanger (11); a heat source-side heat exchanger (13) for heat exchange between a target to undergo heat exchange and the refrigerant decompressed and expanded by the expansion valve (12); an oil equalizing mechanism (20) connecting the lower stage-side compressor (10a) and the higher stage-side compressor (10b), through which a refrigerant oil flows; and a four-way switching valve (14) for selectively switching between a two-stage compression path in which the refrigerant flows in order to the lower stage-side compressor (10a) and the higher stage-side compressor (10b), and a one-stage compression path in which it flows either to the lower stage-side compressor (10a) or the higher stage-side compressor (10b) only.

Inventors:
OMURA MINEMASA (JP)
OKADA TAKUYA (JP)
TATEISHI TAICHI (JP)
SATO HAJIME (JP)
Application Number:
PCT/JP2014/004029
Publication Date:
April 02, 2015
Filing Date:
July 31, 2014
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD (JP)
International Classes:
F25B1/00; F25B1/10; F25B30/02; F25B41/20; F25B41/31; F25B43/02
Foreign References:
JP2013139902A2013-07-18
JP2008111585A2008-05-15
JP2008064421A2008-03-21
JP2013024447A2013-02-04
JP2001324247A2001-11-22
JPH0593552A1993-04-16
JPH062966A1994-01-11
JP2009168330A2009-07-30
Other References:
See also references of EP 3040643A4
Attorney, Agent or Firm:
OBA, Mitsuru et al. (JP)
Mitsuru Oba (JP)
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