Fluid displacement apparatus with variable displacement mechanis

Details Fluid displacement apparatus with variable displacement mechanis Fluid displacement apparatus with variable displacement mechanis

1995-11-22

1999-02-23

Freay, Charles G

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

F04B 4900

Patent

active

058737073

ABSTRACT:
A control mechanism for a fluid displacement apparatus is disclosed. The control mechanism controls fluid communication between an intemediate pressure chamber and a suction chamber of the fluid displacement apparatus, which has a communication channel extending between the intermediate pressure chamber and the suction chamber. The mechanism includes a first valve element having a cylinder and a piston slidably disposed within the cylinder between positions corresponding to maximum and reduced displacement of the compressor. This movement defines a maximum amplitude of the compressor. The cylinder has a bottom wall seperating the cylinder chamber from the suction chamber. A hole is formed in a wall between the cylinder chamber and the intermediate pressure chamber. A distance between the bottom wall and the hole is designed to be greater than the maximum amplitude to prevent the piston from striking the bottom wall. Different shapes may be used for the hole to change the nature of the transition from maximum to reduced displacement.

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