Title:
MULTISTAGE COMPRESSION DEVICE, REFRIGERATION CYCLE COMPRISING SAME, AND OPERATION METHOD FOR MULTISTAGE COMPRESSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/170356
Kind Code:
A1
Abstract:
A multistage compression device (20) comprising: a plurality of compressors (21A, 21C) arranged in series in a refrigerant circulation line (10); rotational frequency modifiers (29A, 29C), provided to each of the plurality of compressors (21A, 21C); and a control device (100). In order that the outflow oil amount of a downstream-side compressor is less than the outflow oil amount of an upstream-side compressor, the control device (100) comprises a rotational frequency setting unit (102) for setting the rotational frequency of each of the compressors (21A, 21C), and a rotational speed instruction unit (105) for instructing the corresponding rotational frequency modifier of the rotational frequency of the respective compressors as set by the rotational frequency setting unit (102).
Inventors:
MAENO MASASHI (JP)
YOSHIDA SHIGERU (JP)
YOSHIDA SHIGERU (JP)
Application Number:
PCT/JP2017/012307
Publication Date:
October 05, 2017
Filing Date:
March 27, 2017
Export Citation:
Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD (JP)
International Classes:
F25B1/00; F25B1/10
Foreign References:
| JP2013024447A | 2013-02-04 | |||
| JP2006214602A | 2006-08-17 | |||
| JPH11142002A | 1999-05-28 | |||
| EP2088388A1 | 2009-08-12 | |||
| JP2003279175A | 2003-10-02 | |||
| JPH0735425A | 1995-02-07 | |||
| JP2013024447A | 2013-02-04 |
Other References:
See also references of EP 3392577A4
Attorney, Agent or Firm:
MORI Ryuichirou et al. (JP)
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