Title:
TURBO FREEZING MACHINE AND START-UP CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2017/208685
Kind Code:
A1
Abstract:
The present invention is provided with: a turbo compressor (3) that compresses a refrigerant; a condenser (5) that condenses the refrigerant compressed by the turbo compressor (3); an expansion valve (7) that expands a liquid refrigerant introduced from the condenser (5); an evaporator (9) that evaporates the refrigerant expanded by the expansion valve (7); an oil tank (17) that stores a lubricating oil supplied to the turbo compressor (3); a pressure equalizing pipe (23) that connects the oil tank (17) and the evaporator (9); and a control unit that controls start-up. The control unit calculates the amount of a refrigerant eluded into the lubricating oil in the oil tank (17) at the time of start-up, and reduces a pressure reduction speed in the oil tank (17) by limiting the opening operation of an IGV (13) when the refrigerant elution amount per prescribed time exceeds a prescribed value.
Inventors:
SUEMITSU RYOSUKE (JP)
HASEGAWA YASUSHI (JP)
HASEGAWA YASUSHI (JP)
Application Number:
PCT/JP2017/016403
Publication Date:
December 07, 2017
Filing Date:
April 25, 2017
Export Citation:
Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD (JP)
International Classes:
F25B1/053; F04D27/00; F25B1/00
Foreign References:
| US4404811A | 1983-09-20 | |||
| US4829786A | 1989-05-16 | |||
| US5066197A | 1991-11-19 | |||
| US4404812A | 1983-09-20 | |||
| JPH06147122A | 1994-05-27 | |||
| JP2009185710A | 2009-08-20 |
Attorney, Agent or Firm:
FUJITA, Takaharu (JP)
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