Importance

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Abstract

A portable fluid pumping device, comprises a piston carried within a compartment by a rolling diaphragm and defining, on one side thereof, an expansible-contractible pumping chamber communicating with the inlet and outlet ports; a drive for the piston including an electric rotary motor and an eccentric bearing coupling the motor to the piston to reciprocate the piston upon the rotation of the motor; a flywheel coupled to the motor; and valves permitting fluid to enter the pumping chamber from the inlet port during the forward strokes of the piston, and to exit from the pumping chamber via the outlet port during the return strokes of the piston. The strokes of the piston are limited such that the volume of the pumping chamber in the contracted condition is more than 1/5 its volume in the expanded condition. In addition, the piston, drive, flywheel and valves are all arranged in a single assembly, the housing being partitioned to permit the quick introduction and removal of the single assembly for repair or maintenance purposes.

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First Claim