Self-priming pumping device for hydraulic circuits

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.

Dependencies are inferred from the claim text.