PURPOSE: To provide a water supply system extremely minimizing energy loss by efficiently controlling rotation of a pump arranged in a water storage tank.
CONSTITUTION: This is a pressure water supply system provided with submergible pumps 21, 22 arranged in a water receiving tank 1, a pipe line and a pressure sensor 9 in the pipe line and to control the number of rotation of the pumps by inputting a signal to a control part 11 by detecting discharge pressure of the pumps and commanding a required frequency to inverters 31, 32 by the control part 11 in order to control the number of revolution of the pumps, and it makes the control par 11 store a piping resistance estimation theoretical expression acquired from a performance curve of the pumps and command the frequency based on this expression to an inverter 4.
HONMA TSUTOMU
ICHIKAWA HIDEAKI
