Method for Driving a Pump Device
First Claim
1. A method for driving a pump device, comprising:
- a suctioning step for suctioning a fluid into a pump chamber from an intake port by inducing displacement of a displacing member that defines part of an inside peripheral surface of the pump chamber in the direction of increasing internal volume of the pump chamber, with the discharge port of the pump chamber closed and the intake port open;
a discharging step for discharging the fluid from the pump chamber by inducing displacement of the displacing member in the direction of decreasing internal volume of the pump chamber, with the discharge port open and the intake port closed; and
a correcting step for inducing displacement of the displacing member with both the intake port and the discharge port of the pump chamber closed;
wherein the steps are carried out in the order of suctioning, correcting, and discharging;
or in the order of discharging, correcting, and suctioning.
2 Assignments
0 Petitions
Accused Products
Abstract
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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Citations
10 Claims
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1. A method for driving a pump device, comprising:
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a suctioning step for suctioning a fluid into a pump chamber from an intake port by inducing displacement of a displacing member that defines part of an inside peripheral surface of the pump chamber in the direction of increasing internal volume of the pump chamber, with the discharge port of the pump chamber closed and the intake port open; a discharging step for discharging the fluid from the pump chamber by inducing displacement of the displacing member in the direction of decreasing internal volume of the pump chamber, with the discharge port open and the intake port closed; and a correcting step for inducing displacement of the displacing member with both the intake port and the discharge port of the pump chamber closed; wherein the steps are carried out in the order of suctioning, correcting, and discharging;
or in the order of discharging, correcting, and suctioning. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification