EP 2402681 A4 20170405 - REFRIGERATION UNIT
Title (en)
REFRIGERATION UNIT
Title (de)
KÜHLEINHEIT
Title (fr)
UNITÉ DE RÉFRIGÉRATION
Publication
Application
Priority
- JP 2009006486 W 20091130
- JP 2009046648 A 20090227
Abstract (en)
[origin: EP2402681A1] In a refrigerant circuit (20), the variable capacity compressor (40a) sucks refrigerant through a first suction pipe (51), and a second fixed capacity compressor (40c) sucks refrigerant through a third suction pipe (53). Refrigeration oil of an oil separator (47a-47c) flows into the compressor (40a-40c) through an oil return pipe (54) and a main injection pipe (61) together with intermediate-pressure refrigerant. During a normal operation, a controller (200) adjusts the degree of opening of an injection motor-operated valve (64a-64c) so that the temperature of refrigerant discharged from the corresponding compressor reaches a predetermined target value. If the first suction pipe (51) has a pressure lower than that of the third suction pipe (53), the controller temporarily decreases the degree of opening of the first injection motor-operated valve (64a) as compared to that during the normal operation, and temporarily increases the degree of opening of the third injection motor-operated valve (64c) as compared to that during the normal operation. As a result, the flow rate of intermediate-pressure refrigerant and refrigeration oil flowing into the second fixed capacity compressor (40c) is increased.
IPC 8 full level
F25B 1/00 (2006.01); F25B 31/00 (2006.01)
CPC (source: EP)
F25B 13/00 (2013.01); F25B 31/004 (2013.01); F25B 2313/005 (2013.01); F25B 2313/0233 (2013.01); F25B 2313/02743 (2013.01)
Citation (search report)
- No further relevant documents disclosed
- See references of WO 2010097874A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2402681 A1 20120104; EP 2402681 A4 20170405; EP 2402681 B1 20180321; JP 2010223574 A 20101007; JP 4462387 B1 20100512; WO 2010097874 A1 20100902
DOCDB simple family (application)
EP 09840728 A 20091130; JP 2009006486 W 20091130; JP 2009271785 A 20091130