Refrigeration – Automatic control – Refrigeration producer
Patent
1990-07-16
1991-12-31
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
621964, 62201, F25B 100
Patent
active
050760688
ABSTRACT:
A cooling device for a plurality of coolant circuits for equipment to be cooled, also those having greatly differing cooling power requirements, whose evaporator is disposed in a refrigerant circuit including a compressor, a condenser and an expansion valve. A thermostat switches on the compressor, dependent on the temperature of the coolant in the cooling circuits as measured upstream of the evaporator, if the switching temperature of the coolant is reached and switches off the compressor if the switching temperature is no longer reached. A bypass valve in a bypass conduit between points of connection of the refrigerant conduit downstream of the compressor and downstream of the expansion valve, is controlled by a pressure sensor provided in the refrigerant circuit and disposed upstream of the compressor so that, if there is a minimum pressure in the evaporator, which pressure must always be maintained for reasons of safety in order to prevent the coolant from freezing in the evaporator, the bypass valve is opened, and if there is a certain pressure in the evaporator above the minimum pressure the bypass valve is closed.
REFERENCES:
patent: 2022771 (1935-12-01), Killen
patent: 2136813 (1938-11-01), Dolison
patent: 2598751 (1952-06-01), Berkowitz et al.
patent: 2646667 (1953-07-01), Kormer
patent: 3481151 (1969-12-01), Seeley
patent: 3675441 (1972-07-01), Perez
patent: 3859812 (1975-01-01), Pavlak
patent: 4060997 (1977-12-01), Shultz et al.
KKW Kulmbacher Klimagerate-Werk GmbH
Wayner William E.
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