Pumps – Expansible chamber type – Valved piston
Patent
1997-11-13
1999-11-09
Freay, Charles G.
Pumps
Expansible chamber type
Valved piston
417552, 417523, 417312, 184 66, 184 618, F04B 3910
Patent
active
059802227
ABSTRACT:
A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high temperature. A motor and a lubrication system are contained within the low pressure area and the discharge side of the compressor mechanism is disposed in the high pressure area. A cylinder block effectively separates the high and low pressure areas of the compressor. The lubrication system includes an axial passage for communication oil from a sump to various compressor components, including rotational bearings. A seal cap is disposed at the end of the crankshaft that extends into the high pressure area and in combination with the cylinder block defines an oil discharge chamber at low pressure and isolated from the high pressure area. A second vent passage formed in the upper end portion of the crankshaft provides a communication path between a suction cavity formed in the compressor mechanism and the oil discharge chamber within the seal cup. A pressure drop caused by the reciprocating action of the pistons in the compressor mechanism occurs at the oil discharge area formed in the seal cup thereby assisting the oil pump in drawing oil through the oil passage in the crankshaft. An acoustic insulator is provided intermediate the compressor mechanism and a mounting flange to isolate and reduce vibration and noise which occurs during compressor operation.
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Freay Charles G.
Gartenberg Ehud
Tecumseh Products Company
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