Suction-controlled ring gear pump

Details Suction-controlled ring gear pump Suction-controlled ring gear pump

1993-03-22

1995-01-10

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Bypass or relief valve carried by movable pumping member

417441, F04B 4900

Patent

active

053801695

ABSTRACT:
In a suction-controlled ring gear pump a continuous elimination of the vacuum occurring in the displacement cells of the pump at higher speed is achieved by a long distance of the displacement cells from the end of the suction region to the start of the outlet opening and the resulting diminishing of the displacement cells. To avoid squeeze oil when operating at low speed, the displacement cells following each other in the displacement direction between the gear teeth are each connected to the adjacent displacement cells by overflow passages which pass through the gear teeth and in which check valves prevent a flow against the displacement direction. To obtain an increased pump power when reaching specific operating parameters the flow resistance in the suction conduit can be reduced and the effective edge of the pressure kidney shifted forwardly by connection of a further preceding pressure kidney.

REFERENCES:
patent: 5096397 (1992-03-01), Eisenmann

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