Refrigeration – Automatic control – Refrigeration producer
Patent
1979-03-21
1980-11-04
Capossela, Ronald C.
Refrigeration
Automatic control
Refrigeration producer
62509, F25B 4100
Patent
active
042312299
ABSTRACT:
Disclosed is a means for preventing "logging" of receivers, that is, the excess filling of a receiver with liquid in a refrigeration system of the type in which a compressor, a condenser, and one or more evaporators are connected in a closed cycle in association with a surge receiver. Communication between the discharge side of the compressor and the receiver incorporates a valve of the differential pressure regulating type, having means sensitive to the relationship of pressures established and maintained in a liquid line extending from the condenser to the evaporator and in the compressor discharge line extending from the compressor to the condenser, respectively. The valve responds to the pressure differential between these lines to maintain pressure in the receiver at a value slightly less than the maintained condensing pressure existing in the liquid line, to prevent excess liquid from accumulating in the receiver and in this way eliminate "starving" of the expansion valves associated with the evaporators. The disclosed means for establishing and maintaining receiver pressure in a preferred embodiment utilizes a capillary sensing element in association with the differential pressure regulating valve. The element senses pressure in the liquid line upstream from an inlet pressure regulating valve. The inlet pressure regulating valve establishes and maintains an optimum condensing pressure and as a consequence thereof establishes the desired optimum differential between the pressures at the inlet and outlet sides of the condenser.
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Capossela Ronald C.
Emhart Industries Inc.
Kane John J.
Sperry Albert
Zoda Frederick A.
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