| 摘要 |
PROBLEM TO BE SOLVED: To operate and stop a pump device without fixing an operation starting pressure value and an operation stopping pressure value by stopping a pump for a fixed time, and judging a flow rate by seizing a pressure variation at that time after confirming that detecting pressure does not change for a fixed time by storing the detecting pressure at all times. SOLUTION: A solution plug is opened up to opening A from time T1 to T3. At the time T3, pump pressure becomes constant (P1). A microcomputer recognizes that the pump pressure is constant (P1), and restarts a pump at time T4 after stopping it during timeΔT. Therefore, the microcomputer detects a pressure drop quantityΔP, and judges a present flow rate, and compares it with a preset stopping flow rate. When judged that it is not less than the stopping flow rate, the pump is continuously operated. When the solution plug is closed up to opening B from time T5 to T6, the microcomputer recognizes the pump pressure becomes constant (P2), and restarts the pump at time T7 after stopping it during timeΔT, and compares a present flow rate with a preset flow rate. When judged that it is less than the preset flow rate, the pump is stopped.
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