Refrigeration – Automatic control – Withdrawing or adding refrigerant from or to normally closed...
Patent
1995-04-19
1997-04-08
Sollecito, John M.
Refrigeration
Automatic control
Withdrawing or adding refrigerant from or to normally closed...
62292, 62475, 622283, F25B 4500
Patent
active
056177313
ABSTRACT:
In a refrigerant recovery/recycling apparatus, a primary vapor-type filter/dryer is arranged downstream of the system inlet which receives recovered vapor refrigerant. The filter/dryer is provided with isolation valves upstream and downstream thereof so as to allow replacement of the cores. An oil separator is located downstream of the primary filter/dryer. To prevent excessive inlet pressures to the compressor of the recovery apparatus, a crankcase pressure regulator is provided upstream of the compressor inlet, in addition to high-and low-pressure shut-off switches. Furthermore, an oil separator is provided at the compressor outlet to remove any compressor oil from the superheated vapor refrigerant emerging from the compressor and returning that oil to the compressor via a return line. Condensed liquid refrigerant is provided to the recycling apparatus of the system by first passing through a second or recirculation filter/dryer, again one of conventional construction with replaceable filter cores. The filtered liquid refrigerant, from which non-condensable gas has been effectively removed by agitation in the filter/dryer, can then be supplied to an internal or external tank, and recycled through a hand expansion valve which throttles the liquid refrigerant into a vapor phase over a continuous range.
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Mainstream Engineering Corporation
Sollecito John M.
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