EP 3249317 B1 20190424 - OIL RETURN CIRCUIT AND OIL RETURN METHOD FOR REFRIGERATING CYCLE
Title (en)
OIL RETURN CIRCUIT AND OIL RETURN METHOD FOR REFRIGERATING CYCLE
Title (de)
ÖLRÜCKFÜHRUNGSKREISLAUF UND ÖLRÜCKFÜHRUNGSVERFAHREN FÜR KÜHLKREISLAUF
Title (fr)
CIRCUIT ET PROCÉDÉ DE RETOUR D'HUILE POUR CYCLE DE RÉFRIGÉRATION
Publication
Application
Priority
- JP 2015036885 A 20150226
- JP 2016050793 W 20160113
Abstract (en)
[origin: EP3249317A1] The purpose of the present invention is to make it possible to minimize any increase in oil temperature within a compressor and to ensure a permissible operating range and conditions comparable to those for R410A refrigerant, even when a R32 refrigerant having a high discharge gas temperature is used, as well as to minimize any increase in the oil circulation rate and the effects on the refrigerating cycle capacity and performance. The present invention is provided with a refrigerating cycle (1) equipped with a low-pressure housing-type compressor (2) and filled with R32 refrigerant, an oil separator (3) provided to the discharge circuit (13A) of the compressor, and an oil return circuit (31) for returning the oil separated by the oil separator to an oil reservoir inside the housing of the compressor. The oil return circuit is a parallel circuit comprising a direct circuit (32) for direct return of oil to the oil reservoir in the housing, and a cooling circuit (35) for return of oil having been cooled by an oil cooler (37), and is provided with an oil temperature control unit (42) for detecting at least one parameter among the discharge temperature of the refrigerant, and the oil temperature or oil viscosity within the compressor, and when the parameter exceeds a threshold value, switching the oil return circuit from the direct circuit to the cooling circuit, and returning the oil once the oil temperature is brought to a prescribed temperature or lower.
IPC 8 full level
F25B 1/00 (2006.01); F25B 1/04 (2006.01); F25B 31/00 (2006.01); F25B 43/02 (2006.01)
CPC (source: EP KR)
F25B 1/00 (2013.01 - EP); F25B 1/04 (2013.01 - EP); F25B 9/002 (2013.01 - KR); F25B 31/004 (2013.01 - EP KR); F25B 43/02 (2013.01 - EP KR); F25B 2500/16 (2013.01 - EP KR); F25B 2700/1933 (2013.01 - EP); F25B 2700/2105 (2013.01 - EP KR)
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3249317 A1 20171129; EP 3249317 A4 20180314; EP 3249317 B1 20190424; AU 2016225575 A1 20170824; AU 2016225575 B2 20181101; CN 107532824 A 20180102; JP 2016161138 A 20160905; JP 6495048 B2 20190403; KR 102099665 B1 20200410; KR 20170102987 A 20170912; WO 2016136305 A1 20160901
DOCDB simple family (application)
EP 16755055 A 20160113; AU 2016225575 A 20160113; CN 201680012020 A 20160113; JP 2015036885 A 20150226; JP 2016050793 W 20160113; KR 20177022335 A 20160113