Self-priming pumping device for hydraulic circuits

Details Self-priming pumping device for hydraulic circuits Self-priming pumping device for hydraulic circuits

1996-02-08

1998-05-12

Lithgow, Thomas M.

Liquid purification or separation

Structural installation

Closed circulating system

2104162, 4171992, 417200, 417201, 119259, A01K 6304, B01D 3532, F04B 2314, F04B 4304

Patent

active

057500231

ABSTRACT:
The pumping device comprises a pump driven by a motor having a stator and a permanent-magnet rotor located between polar expansions and connected to an impeller. A liquid suction duct and a liquid delivery duct are connected to the pump to define a hydraulic circuit. A reciprocating vacuum pump, for creating a negative pressure at the suction duct of the pump, has a resilient cylindrical element connected to a rigid cylindrical box-like element and defines therewith a chamber. The chamber has inlet and outlet valves connected to the hydraulic circuit through a poppet valve, and an arm-like member connected to the resilient element. An opposite end of the arm-like member supports a magnet located between poles of the stator of the motor, whereby to cause movement of the arm-like member and the resilient element for circulating fluid through the chamber via the inlet and outlet valves for priming the pump upon actuating the poppet valve.

REFERENCES:
patent: 3392836 (1968-07-01), Willinger
patent: 3512646 (1970-05-01), Willinger
patent: 3516543 (1970-06-01), Willinger
patent: 3578880 (1971-05-01), Cygnor
patent: 3825374 (1974-07-01), Kondo
patent: 4154681 (1979-05-01), Shields
patent: 4589982 (1986-05-01), Willinger
patent: 4818188 (1989-04-01), Chan
patent: 5188516 (1993-02-01), Huang

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