Starting stage of a self-limiting regenerative pumping element for a high-speed centrifugal motor fuel pump and method thereof

摘要

A motor or pump fuel system includes a centrifugal pump having an impeller for transmitting energy to an associated fluid for an associated downstream engine fuel system. A regenerative start stage is in selective fluid communication with the pump. An ejector includes an input that communicates with the pump output and an output that communicates with the pump input. In addition, a control valve is interposed between the pump output and the regenerative start stage which selectively regulates the associated flow from the regenerative start stage. The associated method includes transmitting the flow from the centrifugal pump to a regenerative start stage to power an associated downstream flow circuit. During low speed start, a portion of the flow of the regenerative start stage is supplied to an ejector which recirculates it to an inlet of the centrifugal pump. Once the centrifugal pump provides a predetermined level of at least one of the flow and pressure requirements of the associated flow circuit, the method includes stopping flow from the regenerative start stage. Figure to be published with the abstract: Fig. 1