Refrigeration – Automatic control – Of external fluid or means
Patent
1988-02-24
1989-04-11
Tapolcai, William E.
Refrigeration
Automatic control
Of external fluid or means
236 493, F25D 1708
Patent
active
048194425
ABSTRACT:
A refrigerator system, a control device therefor and methods of making and operating the same are provided, the system having a frozen food compartment and a non-frozen food compartment interconnected together by an air circulating unit that has a control valve unit therein for controlling the amount of opening of the air circulating unit between the compartments, the control valve unit comprising a housing having a movable valve member and a temperature sensing unit operatively interconnected to the valve member to control the position of the valve member in relation to the temperature sensed by the temperature sensing unit, the system having a fan for forcing an air flow through the air circulating unit from the frozen food compartment to the non-frozen food compartment when the fan is operating and the valve member is in an open condition thereof, the system having structure for causing the fan to be operating only when the valve member is in a certain open condition thereof.
REFERENCES:
patent: 1828016 (1931-10-01), Andres
patent: 3004484 (1961-10-01), Lorenz
patent: 3288370 (1966-11-01), Mingrove et al.
patent: 3917433 (1975-11-01), Tomitaka
patent: 4276754 (1981-07-01), Ty
Everett Charles J.
Sepso Roger P.
Robertshaw Controls Company
Tapolcai William E.
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