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Title:
PROTECTION DEVICE AND PROTECTION METHOD FOR REFRIGERATING MACHINE
Document Type and Number:
Japanese Patent JP2019128108
Kind Code:
A
Abstract:
To provide a protection device and a protection method for a refrigerating machine each enabling a refrigerating machine to be continuously and stably operated by preventing unnecessary bypass valve opening control.SOLUTION: A protection device 8 is provided that is applied to a refrigerating machine 1 comprising a plurality of compressors 2 connected in parallel, a bypass pipe 6 bypassing a delivery side and a suction side of the plurality of compressors 2, and a bypass valve 7 provided in the bypass pipe 6. The protection device comprises: a surging determination part which determines whether surging occurs; a vane control part which performs vane closing control to control a suction vane 9 provided at each compressor 2 in a closing direction; and a bypass valve control part which performs bypass valve opening control to control the bypass valves 7 in an opening direction when the surging determination part determines that surging occurs and when the vane control part does not perform the vane closing control.SELECTED DRAWING: Figure 1

Inventors:
SUEMITSU RYOSUKE
YOKOYAMA AKIMASA
IKENO YASUHIRO
HASEGAWA HIROSHI
Application Number:
JP2018010687A
Publication Date:
August 01, 2019
Filing Date:
January 25, 2018
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD
International Classes:
F25B1/053; F04D27/02; F25B1/00; F25B49/02
Domestic Patent References:
JPS5440310A1979-03-29
JPH1151502A1999-02-26
JP2005534858A2005-11-17
JPS4734896Y11972-10-23
JP2013079586A2013-05-02
Attorney, Agent or Firm:
藤田 考晴
三苫 貴織
川上 美紀
長田 大輔