Refrigeration – Automatic control – Refrigeration producer
Patent
1985-01-25
1986-12-02
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62471, F25B 3100
Patent
active
046255230
ABSTRACT:
A single or multiple evaporator vapor-compression refrigerant system for single or multi-story structures includes a lubricating oil collection reservoir and a separate oil pumping unit for returning oil separated from the refrigerant fluid in the refrigerant flow circuit to the compressor unit. In multi-story, direct expansion, vapor-compression, air conditioning systems, a simplified generally vertical refrigerant vapor return riser is provided with an oil reservoir at the lowest elevation point of the riser and a liquid level sensing switch for energizing and deenergizing the separate lubricating oil pumping unit. The pumping unit may include an electric or refrigerant fluid driven motor connected to a pump or the pumping unit may include a pressure vessel into which high pressure refrigerant vapor is admitted to displace oil back to the compressor through an oil return conduit.
REFERENCES:
patent: 1866992 (1932-07-01), Zieber
patent: 3257824 (1966-06-01), Shikasho
patent: 3494137 (1970-02-01), Cargo
Gilliland, Jr. James L.
Holder Homer W.
Toub Samuel G.
Glaser Kenneth R.
Wayner William E.
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