Title:
REFRIGERATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/079731
Kind Code:
A1
Abstract:
Provided is a refrigeration device that can reduce, to be small, deficiency/excess differences in the amount of refrigeration machine oil between compressors in the case where a plurality of compressors are connected in parallel. The present invention comprises: a plurality of parallel-connected compressors (21a, 21b, 21c) that include at least one inverter compressor (21a); an oil separator (23) that is provided on the discharge sides of the plurality of compressors; refrigerant supply pipes (30, 30a, 42) that supply a refrigerant to the plurality of compressors; an oil return pipe (38) that connects the oil separator and the refrigerant supply pipes to each other; and a controller (70). The controller performs one or both of the following control operations: when a first prescribed condition is satisfied, the rotation frequency of the inverter compressor (21) is reduced, and as a result, a greater amount of refrigeration machine oil is returned to the compressors (21b, 21c) other than the inverter compressor the rotation frequency of which has been reduced; when a second prescribed condition is satisfied, relative flow rate adjustment degrees are changed among a plurality of flow rate adjustment valves (33a, 33b, 33c), which are provided in the refrigerant supply pipes (30, 30a, 42) so as to respectively correspond to the intake sides of the plurality of compressors, namely between the flow rate adjustment valve (33a) provided so as to correspond to the inverter compressor and the other flow rate adjustment valves (33b, 33c), and as a result, greater amounts of refrigeration machine oil are returned to the compressors other than the inverter compressor.
Inventors:
NOMURA KAZUYOSHI
SAKAE SATORU
TAKEGAMI MASAAKI
KONDOU AZUMA
SAKAE SATORU
TAKEGAMI MASAAKI
KONDOU AZUMA
Application Number:
PCT/JP2017/038967
Publication Date:
May 03, 2018
Filing Date:
October 27, 2017
Export Citation:
Assignee:
DAIKIN IND LTD (JP)
International Classes:
F25B1/00; F25B43/02
Foreign References:
| JP2010223574A | 2010-10-07 | |||
| JP2003028523A | 2003-01-29 | |||
| JP2009216354A | 2009-09-24 | |||
| JP2008076017A | 2008-04-03 |
Attorney, Agent or Firm:
SHINJYU GLOBAL IP (JP)
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