Suction modulation valve for refrigerant system with...

Details Suction modulation valve for refrigerant system with... Suction modulation valve for refrigerant system with...

2011-06-28

2011-06-28

Norman, Marc E (Department: 3744)

Refrigeration

Automatic control

Refrigeration producer

C062S228300

Reexamination Certificate

active

07966838

ABSTRACT:
A pulse width modulation control is provided for a suction modulation valve in a refrigerant system. An intentional small “leakage” path is maintained through the suction modulation valve to ensure that the pressure inside the compressor shell does not decrease below a safe reliability threshold but, at the same time, does not exceed a certain value, which would cause the refrigerant system to operate inefficiently, when the pulse width modulation control has moved the suction modulation valve to a closed position. The size of this minimum “leakage” path is continuously adjusted to ensure that the optimum pressure inside the compressor shell is maintained regardless of the evaporator pressure and other operating conditions.

REFERENCES:
patent: 6227812 (2001-05-01), Kawaguchi et al.
patent: 2008/0250801 (2008-10-01), Lifson et al.
patent: 2009/0205349 (2009-08-01), Lifson et al.
patent: 2010/0011792 (2010-01-01), Lifson et al.
patent: 2010/0043468 (2010-02-01), Lifson et al.
Search Report and Written Opinion mailed on Oct. 4, 2007 for PCT/US2006/49002.

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