Refrigeration system

Details Refrigeration system Refrigeration system

2011-04-05

2011-04-05

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C062S193000, C062S468000, C062S470000, C062S498000, C418S055600

Reexamination Certificate

active

07918096

ABSTRACT:
In a refrigerant circuit (11), a compressor (20) and an expander (30) are provided separately. An expander casing (34) is connected to a delivery pipe (26) of the compressor (20) and high pressure refrigerant passes through the inside of the expander casing (34). Therefore, the compressor casing (24) and the expander casing (34) are equalized in their internal pressure. An oil distribution pipe (41) for connection of an oil sump (27) of the compressor (20) and an oil sump (37) of the expander (30) is provided with an oil regulating valve (52). The oil regulating valve (52) is controlled in response to a signal outputted from an oil level sensor (51). When the oil regulating valve (52) is opened, the oil sump (27) within the compressor casing (24) and the oil sump (37) within the expander casing (34) fluidly communicate with each other whereby refrigeration oil travels through the oil distribution pipe (41).

REFERENCES:
patent: 2010/0101268 (2010-04-01), Sakitani et al.
patent: 2010/0186439 (2010-07-01), Ogata et al.
patent: 2000-241033 (2000-09-01), None
patent: 2004-325018 (2004-11-01), None
patent: 2004-325019 (2004-11-01), None
patent: 2005-2832 (2005-01-01), None
patent: 2005-299632 (2005-10-01), None
patent: 2007187332 (2007-07-01), None
patent: 2008107049 (2008-05-01), None
patent: WO-2007/023599 (2007-03-01), None

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