INFLOW LIQUID QUANTITY PREDICTING ARITHMETIC UNIT AND INFLOW LIQUID QUANTITY PREDICTING COMPUTING METHOD FOR PUMP FACILITY

摘要

PROBLEM TO BE SOLVED: To provide an inflow liquid quantity predicting arithmetic unit and inflow liquid quantity predicting computing method for pump facility capable of minimizing the difference between an arithmetically predicted inflow quantity and an actual inflow quantity to count forms closer to the change of the actual inflow quantity. SOLUTION: This inflow liquid quantity predicting arithmetic device for a pump facility equipped with a manhole 10 having a fixed sectional area within an effective level fluctuating width and a drain pump 11 comprises an analog level gauge 15 for detecting the level 13 of the manhole 10 and an arithmetic unit 16 having a level data storing function for acquiring and storing the level output signal of the analog level gauge 15 every unit time. The liquid inflow quantity per unit time just before the operation of the drain pump 11 is arithmetically determined by the arithmetic unit 16 according to the level data just before the operation of the drain pump 11 stored in the arithmetic unit 16, and the inflow liquid quantity is predicted on the basis of the assumption that the liquid inflow quantity arithmetically determined liquid inflow quantity is continued even during the operation of the drain pump 11.