Refrigerant handling system with inlet refrigerant liquid/vapor

Details Refrigerant handling system with inlet refrigerant liquid/vapor Refrigerant handling system with inlet refrigerant liquid/vapor

1991-11-25

1993-04-20

Sollecito, John M.

Refrigeration

Automatic control

Withdrawing or adding refrigerant from or to normally closed...

62292, 62197, 62218, 62503, F25D 2100

Patent

active

052031772

ABSTRACT:
A refrigerant recovery system includes a compressor and an evaporator connected to the compressor inlet for evaporating refrigerant passing therethrough to the compressor inlet from refrigerant equipment under service. A sensor is coupled to the system input for detecting presence of liquid phase refrigerant. A valve is connected to the compressor inlet in parallel with the evaporator for bypassing refrigerant from the evaporator to the compressor inlet when the sensor indicates that liquid refrigerant is absent at the system input. The liquid refrigerant sensor takes the form of an open canister between the system input and the evaporator, and a liquid level sensor coupled to the canister for sensing level of liquid refrigerant collected within the canister. A solenoid valve is connected in parallel with the evaporator, and is responsive to the liquid level sensor for opening the valve and bypassing the evaporator in the absence of liquid refrigerant within the canister. In this way, when input refrigerant is already in vapor phase, such refrigerant is bypassed to the compressor inlet, eliminating undesirable superheating of the refrigerant within the evaporator.

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