| 摘要 |
PURPOSE:To distribute water by a flow rate which is equal to a demand flow rate which is varied every moment by managing a digestion of a daily water quantity prescribed by a contract, by setting the product of a pump water distribution ratio and a total water distribution flow rate, as a water distribution pump flow rate, controlling the number of operating pumps and the target revolving speed and executing the pump pressure feed, based on this water distribution pump target flow rate. CONSTITUTION:A water distribution pump 4 is operated only in a period Tp extending from the time t1 when a total demand flow rate is large, to t2, and during the time except the period Tp, water is distributed by only a natural flow from a clean water reservoir 7. At the time t1, a control device 30 starts the water distribution pump 4 and derives a pump water distribution ratio, the product of this pump water distribution ratio and a flow rate detected by a flow meter 33 is derived, and it becomes a water distribution pump target flow rate. From this water distribution pump target flow rate, the number of water distribution pumps which require an operation, and the pump target revolving speed are derived, and outputted as a command value to a revolving speed control device 16 of a motor 17. The revolving speed control device 16 controls a discharge flow rate of the water distribution pump 4 in accordance with a curve l1 for showing the total demand flow rate as shown by a curve l2.
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