F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/34
F25D 21/06 (2006.01) F25D 21/00 (2006.01)
Patent
CA 1057070
DEFROST PRESSURE CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE The defrost pressure control system for a refrigerator includes a reservoir connected in communication with the evap- orator of the refrigerating system. The reservoir is placed in heat exchange relationship with a portion of the refriger- ator which remains at a relatively low temperature during defrosting so that a portion of the refrigerant in the system condenses in the reservoir during defrosting, thereby being effectively removed from the refrigerating system. A suitable heat sink may also be employed in the heat exchange relation- ship with the reservoir. Because of withdrawal of the afore- mentioned refrigerant, the pressure in the refrigerating sys- tem at the end of the defrosting operation is substantially below that which would otherwise be present. As a result the torque required to start the compressor is significantly reduced, thereby insuring effective starting of the compressor even when driven by an electric motor having a relatively low starting torque. As soon as the compressor resumes operation, the pressure in the evaporator is substantially reduced to a level well below that in the reservoir and the liquid refrig- erant in the reservoir partially vaporizes and all the refrig- erant in the reservoir, both gas and liquid, is returned promptly to the refrigerating system, insuring effective nor- mal operation of the refrigerating system.
288489
Schumacher Frank A.
Sterling John E.
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