| 摘要 |
PURPOSE:To reduce the piping resistance by installing a water wheel having the flow rate detecting means of a pump while is installed inside a discharge side pipe and a photosensor consisting of a luminous element and a light receiving element in pairs which are arranged so that the sensor light crosses on the revolution locus of the vane piece of the water wheel. CONSTITUTION:A pump motor is ON/OFF-controlled on the basis of the outputs of a flow rate detecting means 7 and a pressure sensor 6. The flow rate detecting means 7 is constituted of a water wheel 32 installed in a discharge side pipe 5 and a photosensor 37 consisting of a luminous element 35 and a light receiving element 36 in pairs which are arranged so that the sensor light 34 crosses on the revolution locus of the vane piece 33 of the water wheel 32. Therefore, the load in the pipe of the pump can be reduced by the water wheel, and the operation efficiency can be increased.
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