Rotary expansible chamber devices – Working member has planetary or planetating movement – With relatively movable partition member
Patent
1996-04-30
1998-11-03
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
With relatively movable partition member
F04C 18356
Patent
active
058299602
ABSTRACT:
A suction inlet passage in a cylinder block of a rotary compressor includes a generally symmetrical diverging port which has generally conic cross-sections that divergingly open into a cylinder bore. The diverging port provides a buffer cavity which reduces pulsations and associated noise. The suction inlet passage is further provided with an entrance passage and a narrower passage, which is disposed between the entrance passage and the diverging port and which has a smaller cross-section than either the entrance passage or the diverging port. The suction inlet passage serves as a diffuser with the narrower passage functioning as the throat of the diffuser so as to increase volumetric efficiency with respect to the suction gas entering the cylinder bore. The diverging port extends the point of suction inlet close-off, and correspondingly enlarges the close-off angle, resulting in extending the period of unclosed compression and enhancing the supercharging effect. In this manner, the improved suction inlet passage increases volumetric efficiency, reduces pulsations and associated noise, and increases the pressure of the suction gas in the cylinder bore at the beginning of the compression cycle.
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Tecumseh Products Company
Vrablik John J.
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