Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Patent
1990-09-04
1991-11-12
Tanner, Harry B.
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
62129, 62195, 62475, F25B 4500, F25B 4304
Patent
active
050637495
ABSTRACT:
A refrigerant handling system in accordance with the present invention includes a closed liquid refrigerant storage container and a pump for feeding refrigerant in liquid phase to the container so that any air carried by the circulating refrigerant is captured in the container over the refrigerant. A differential pressure gauge has a first input that receives a fluid pressure signal which varies as a function of saturation pressure of refrigerant in liquid phase fed to the container, and a second input that receives an associated fluid pressure signal as a function of air pressure within the closed container volume. An indicator dial on the gauge displays pressure differential between the refrigerant saturation pressure and the container vapor pressure at the first and second gauge inputs for observation by an operator. A valve is coupled to the container for venting air from the container when such pressure differential exceeds a preselected threshold.
REFERENCES:
patent: 2475218 (1949-07-01), Campbell
patent: 4417451 (1983-11-01), Spauschus
Kent-Moore Corporation
Tanner Harry B.
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