Self-priming vane pump

Abstract

A self-priming vane pump includes a cylindrical rotor disposed in a cavity in a housing including inlet and outlet ports. The rotor defines a plurality of axially extending slots which each receive one of a like plurality of vanes. A garter spring or similar resilient annulus is disposed within the rotor and provides a radially outwardly directed force on the vanes which maintains their contact with the cavity walls during pump start-up and rapidly self-primes the pump. The spring or annulus rests against a shoulder within the hollow rotor and is retained therein by a pressed in collar.

Description

technical field [0001] The present disclosure relates to vane pumps, and more particularly to self-priming vane pumps. Background technique [0002] The content in this part is only to provide background technology related to the present disclosure, which may or may not constitute prior art. [0003] Gear pumps and rotary pumps are often the preferred choice for fixed or positive displacement pumps in applications requiring flows and pressures down to normal averages. However, one disadvantage of such pumps is their efficiency. Due to their construction, when they operate, there will be backflow or leakage through the meshing rotors and around the rotor tips, resulting in reduced forward flow and thus reduced pumping efficiency. [0004] Fixed displacement vane pumps perform at the same flow and pressure range, exhibiting increased efficiency due to reduced leakage and backflow. This reduction in leakage and backflow is achieved due to a better seal between the outer edge...

AI Technical Summary

Problems solved by technology

Since at start-up, the pump is usually running at low speed and zero pressure, the seal quality is low and this problem is exacerbated by the inactive state of the pump so that the formation of the active and the delivery of the pressurized fluid can take an undesirably long time

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