| 摘要 |
During switchover from a suctioning step to a discharging step, a mixing pump (1) carries out a correcting step for displacing a displacing member (17) in the direction for reducing an internal volume of a pump chamber (2); and during switchover from the discharging step to the suctioning step, the pump carries out a correcting step for displacing a displacing member (17) in the direction for increasing the internal volume of the pump chamber (2). In the correcting step, intake ports (30a, 30b), and discharging ports (40a, 40b) of the pump chamber (2) are closed, and the displacing member (17) undergoes displacement for increasing or reducing the internal volume of the pump chamber (2) in a hermetic state. Instability caused by backlash of the displacing member (17) drive system can be eliminated, and a pressure difference between the pump chamber (2) interior and the fluid intake end or the fluid discharge end can be eliminated. It is therefore possible to eliminate or reduce variability in the amount of fluid intake or amount of fluid discharge when switching between the suctioning step and the discharging step.
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