Compressor oil return system for refrigeration apparatus and method
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United States of America Patent
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Nov 26, 1985
Grant Date -
N/A
app pub date -
Nov 14, 1983
filing date -
Nov 14, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved oil return system for use with closed circuit mechanical refrigeration systems having multiple compressors. The oil return system is responsive to the flow of refrigeration gas to the individual compressors and enables an optimum flow of crank case oil to each of the multiple compressors. The system is based on the use of oil pick-up means for each of the suction lines connected between the suction manifold and each of the compressors. This pick-up means comprises a venturi tube which provides for the flow of oil through each of the suction lines responsive to the flow of refrigerant gas therethrough. The venturi tube has an outlet end positioned in a downstream orientation with respect to the flow of refrigerant gas through a surrounding suction drop sleeve.
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