| 摘要 |
PURPOSE:To enable reduction of production of pulsation, vibration, and noise, by a method wherein a bypass hole is connected to a suction hole so as to extend in the direction of a tangential line, surplus fluid is curved along the inner peripheral surface of the suction hole, and produces a vortex, formed coaxially with the suction hole, to suck the vortex in a pump. CONSTITUTION:A bypass hole 12, through which a surplus flow rate is returned to a suction hole 11, is connected to a portion in the vicinity of the one end of the suction hole 11 so as to extend in the direction of a tangential line. As a result, working fluid, returned to the bypass hole 12 by means of a flow rate regulating valve 30, is curved along the inner peripheral surface of the suction hole 11, and produces a vortex V, formed coaxially with the suction hole 11, to suck it in a pump 20 through a port 20a. Since the central part of the vortex V. Since the central part of the vortex V is brought into a negative pressure state by dint of a centrifugal force, working fluid, introduced from the outside through a feed port 14, is sucked in the pump 20 together with the stable working fluid sucked by virtue of the negative pressure. This, even if a flow rate of the working fluid returned through the bypass hole 12 is increased, prevents the occurrence of turbulence in the suction hole 11, and enables production of cavitation, pulsation, and noise. |
