| 摘要 |
PURPOSE:To obtain an optimal operation of a motor suited to fluid load in a discharge passage, by using a vaiable-speed motor, dividing the pump discharge circuit into a plurality of passages, and controlling the speed of a pump-motor by an output signal of a fluid sensor disposed in each of the discharge passages. CONSTITUTION:For instance, a displacement type pump is used as a pump 1 which has a suction passage 2 and a discharge passage 3. The discharge passage 3 is branched into a first discharge passage 4 and a second discharge passage 5, and a water-flow detecting means 6 is provided in the second discharge passage 5. With such an arrangement, the revolving speed of a variable-speed motor of the pump 1 is controlled according to the load in the discharge passage 5 detected by the water-flow detecting means 6. |
