| 摘要 |
A mixing pump (1) performs a correction process for displacing a displacement member (17) in the direction of decreasing the internal volume of a pump chamber (2) when transition is made from a suction process to a delivery process, and performs a correction process for displacing the displacement member (17) in the direction of increasing the internal volume of the pump chamber (2) when transition is made from a delivery process to a suction process. During a correction process, the internal volume of the pump chamber (2) under an enclosed state is increased or decreased by closing the suction ports (30a, 30b) and the delivery ports (40a, 40b) of the pump chamber (2) thereby displacing the displacement member (17). Instability due to backlash of the drive system of the displacement member (17) can be eliminated, and pressure difference between the inside of the pump chamber (2) and the fluid suction side or delivery side can be eliminated. Consequently, variation in fluid suction quantity or delivery quantity can be eliminated or suppressed when transition is made between a suction process and a delivery process.
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