Title:
MULTISTAGE COMPRESSION DEVICE, REFRIGERATION CYCLE COMPRISING SAME, AND OPERATION METHOD FOR MULTISTAGE COMPRESSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/170329
Kind Code:
A1
Abstract:
A multistage compression device (20) comprises a plurality of compression groups (20G) arranged in parallel in a circulation line. The compression groups (20G) comprise a plurality of compressors (21) arranged in series, and a series oil equalization line (34) that connects the plurality of compressors (21) to one another. Oil reservoirs (27) of the uppermost stream compressor (21A) of each compression group (20G) are connected to one another by a parallel oil equalization line (39). The end of the uppermost stream compressor (21A), in the parallel oil equalization line (39), which connects with the oil reservoir (27) is open at a position where the oil level is a prescribed level. A rotational frequency setting unit (102) of a control device (100) sets the rotational frequency for each of the plurality of uppermost stream compressors (21A) such that the pressure inside one of the uppermost stream compressors (21A) is less than the pressure inside all of the remaining uppermost stream compressors (21A).
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Inventors:
MAENO MASASHI (JP)
Application Number:
PCT/JP2017/012258
Publication Date:
October 05, 2017
Filing Date:
March 27, 2017
Export Citation:
Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD (JP)
International Classes:
F25B1/10; F25B1/00; F25B49/02
Foreign References:
| US20100071391A1 | 2010-03-25 | |||
| JPH0735425A | 1995-02-07 | |||
| JP2005188816A | 2005-07-14 | |||
| JP2005351544A | 2005-12-22 | |||
| US5839886A | 1998-11-24 | |||
| US3500962A | 1970-03-17 | |||
| JPH07301465A | 1995-11-14 |
Other References:
See also references of EP 3385640A4
Attorney, Agent or Firm:
MORI Ryuichirou et al. (JP)
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