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US 5,325,675 AGranted
Refrigerant handling system and method with enhanced recovery vacuum capability
AssigneeSPX Corporation
InventorsKenneth W. Manz, Christopher M. Powers
Life of this patent
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AssigneeSPX Corporation
InventorsKenneth W. Manz, Christopher M. Powers
Estimating the term…
A refrigerant recovery system that includes a compressor having an inlet and an outlet, and an oil separator connected to the compressor inlet for separating oil from refrigerant recovered from equipment under service. A check valve is connected between a vapor outlet port on the oil separator and the inlet of the compressor for feeding refrigerant directly to the compressor inlet. A pressure sensor is connected to the oil separator for indicating refrigerant vapor pressure within the separator, and a valve is automatically responsive to such refrigerant vapor pressure for connecting a vacuum pump between the oil separator vapor port and the compressor inlet in parallel with the check valve when refrigerant vapor pressure at the oil separator falls below a predetermined value.
In a refrigerant handling system that includes a compressor for pumping refrigerant and means for connecting an inlet of said compressor to a source of refrigerant to be pumped, the improvement wherein said inlet-connecting means comprises a vacuumpump and means responsive to refrigerant pressure at said inlet-connecting means for selectively connecting said vacuum pump in series with said compressor inlet for drawing a deeper vacuum at said inlet-connecting means than can be obtained by said compressor alone.
A refrigerant recovery system that comprises:
A method of pumping refrigerant from a refrigerant source comprising the steps of:
Dependencies are inferred from the claim text.