Adjustable crankpin throw structure having improved throw stabil

Details Adjustable crankpin throw structure having improved throw stabil Adjustable crankpin throw structure having improved throw stabil

1997-08-14

2000-07-25

Freay, Charles G.

Pumps

Processes

417315, 417221, 417539, F04B 106

Patent

active

060929936

ABSTRACT:
A stabilizing structure for a throw adjusting eccentric cam in a two-stage reciprocating compressor is provided. The compressor includes a block that has at least one cylinder with an associated compression chamber and piston, a crankshaft that includes an eccentric crankpin, and a reversible motor for rotating the crankshaft in a forward and a reverse direction. An eccentric, two position cam is rotatably mounted over the crankpin. The cam rotates to and operates at a first position relative to said crankpin when the motor is running in the forward direction and rotates to and operates at a second position relative to said crankpin when the motor is running in the reverse direction. The combined eccentricities of the crankpin and the cam cause the piston to have a first stroke when the motor operates in the forward direction and a second stroke when the motor operates in the reverse direction. There is also provided a control for selectively operating the motor either in the forward direction or in the reverse direction.

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