| 摘要 |
A fluid pump of the present invention includes a housing (H), a rotary shaft (30), and pump units (70, 80) which are contained in the housing and sucks in , pressurizes, and discharges fluid with being rotationally driven by the rotary shaft. The housing has a suction passage (14b) conducting the fluid from a suction port (14a) to the pump unit, a discharge passage (15a) conducting the fluid from the pump unit to a discharge port (15b) , a return passage (16c) returning a portion of the fluid flowing through the discharge passage to an upstream side of the pump unit, and a control valve (90) controlling a flow of the returned fluid. The return passage (16c) is formed so as to conduct the returned fluid in the same direction as a flow of a sucked fluid flowing through the suction passage (14b) to make the returned fluid flow together with the sucked fluid. As a result, pump efficiency can be improved while preventing a disorder of the flow, flow loss and the like. |
