Automotive thermostatic expansion valve with reduced hiss

Details Automotive thermostatic expansion valve with reduced hiss Automotive thermostatic expansion valve with reduced hiss

2009-01-28

2011-11-01

Norman, Marc (Department: 3744)

Automatic temperature and humidity regulation

Thermostatic

With pressure control

C062S217000, C062S222000

Reexamination Certificate

active

08047449

ABSTRACT:
An expansion valve for an air conditioning system circulates refrigerant through a fixed-displacement compressor, a condenser, and an evaporator. An inlet is provided for receiving refrigerant liquefied in the condenser. An outlet of the expansion valve supplies refrigerant to the evaporator. A valve element controls flow of refrigerant between the inlet and the outlet, wherein the valve element is normally closed. A control assembly is coupled to the valve element and is responsive to at least one temperature or pressure in the air conditioning system to open the valve element to variably meter the refrigerant to the evaporator. A bleed passage bypasses the valve element to conduct refrigerant between the inlet and the outlet. The bleed passage is adapted to bleed refrigerant to the evaporator immediately after the compressor shuts off to prime the air conditioning system for a lower superheat when the compressor turns on, and the bleed path has a flow capacity substantially smaller than the flow capacity of the main valve aperture.

REFERENCES:
patent: 3367130 (1968-02-01), Owens
patent: 6430950 (2002-08-01), Dienhart et al.
patent: 6543239 (2003-04-01), Mittelstrass et al.
patent: 6712281 (2004-03-01), Hirota et al.
patent: 7243501 (2007-07-01), Yahia et al.
patent: 2008/0184717 (2008-08-01), Sienel et al.
patent: 2008074383 (2008-06-01), None
SAE Technical Paper 2001-01-1717, Instabilities Occurring in an Automotive A/C Loop Equipped with an Externally Controlled Compressor and a Thermal Expansion Valve, B. Hamery, J.M. Liu and C. Riviere, May 14-17, 2001.

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