F - Mech Eng,Light,Heat,Weapons – 04 – C
Patent
F - Mech Eng,Light,Heat,Weapons
04
C
230/89
F04C 29/02 (2006.01) F25B 1/047 (2006.01)
Patent
CA 1225071
ABSTRACT OF THE DISCLOSURE A helical screw rotary compressor for a closed loop refrigeration system is connected in series with a condenser and an evaporator with the evaporator raised relative to the compressor and utilizes a vaporizable refrigerant miscible with a lubricating oil employed to lubricate the moving components of the screw compressor. A slide valve underlies helical screw rotors within parallel intersecting bores in the compressor housing and forms a portion of the screw compressor envelope, the rotors opening to a suction port connected to the outlet side of the evaporator. A discharge port leads to an auxiliary chamber bearing an unload cylinder which drives the slide valve and opens to a discharge port leading to the condenser. An oil drain passage leads from the auxiliary chamber to an oversized oil sump. The slide valve slides in a recess within the housing. A further drain passage leads through a drainage check valve to the sump. Condensed refrigerant and the oil return by gravity to the oil sump. Condensed refrigerant and the oil, upon compressor shut down, accumulate in the sump but do not reach the rotors and thus prevent clutch burnout.
457708
Bulkley Clifford T.
Shaw David N.
Dunham-Bush Inc.
G. Ronald Bell & Associates
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