Pump device
A pump device includes a first piezoelectric pump, a second piezoelectric pump connected in series to the first piezoelectric pump on an upstream side of the first piezoelectric pump, a driver unit that supplies alternating-current input power to the first piezoelectric pump and the second piezoelectric pump, and a distribution setting unit that sets a distribution ratio of the input power to be supplied from the driver unit to each of the first piezoelectric pump and the second piezoelectric pump, wherein the distribution setting unit sets a ratio of the input power for the second piezoelectric pump to the input power for the first piezoelectric pump to a value greater than 1 and equal to or less than 1.57.
1. A pump device comprising:
a first piezoelectric pump;
a second piezoelectric pump connected in series to the first piezoelectric pump on an upstream side of the first piezoelectric pump;
a driver unit that supplies alternating-current input power to the first piezoelectric pump and the second piezoelectric pump; and
a distribution setting unit that sets a distribution ratio of the input power supplied from the driver unit to each of the first piezoelectric pump and the second piezoelectric pump, wherein
the distribution setting unit sets a power ratio of the input power for the second piezoelectric pump to the input power for the first piezoelectric pump to a value greater than 1 and equal to or lower than 1.57.
2. The pump device according to claim 1 , wherein
the first piezoelectric pump and the second piezoelectric pump have a same rated output.
3. The pump device according to claim 1 , wherein
the distribution setting unit sets the power ratio of the input power for the second piezoelectric pump to the input power for the first piezoelectric pump to a value between 1.1 and 1.38 inclusive.
4. The pump device according to claim 2 , wherein
the distribution setting unit sets the power ratio of the input power for the second piezoelectric pump to the input power for the first piezoelectric pump to a value between 1.1 and 1.38 inclusive.
5. The pump device according to claim 1 , wherein
the driver unit comprises a first driver and a second driver, each configured to supply alternating-current input power to the first piezoelectric pump and the second piezoelectric pump, respectively.
6. The pump device according to claim 1 , wherein
the driver unit comprises a single common driver configured to supply alternating-current input power to both the first piezoelectric pump and the second piezoelectric pump.
7. The pump device according to claim 1 , further comprising a controller configured to control the driver unit.
8. The pump device according to claim 7 , wherein the controller is configured to control at least one of the input power, an input voltage, or an input current inputted from the driver unit to each of the first piezoelectric pump and the second piezoelectric pump.
9. The pump device according to claim 7 , wherein the distribution setting unit comprises the controller and the driver unit.
10. A pump device comprising:
a first piezoelectric pump;
a second piezoelectric pump connected in series to the first piezoelectric pump on an upstream side of the first piezoelectric pump;
a driver unit that supplies alternating-current input power to the first piezoelectric pump and the second piezoelectric pump; and
a distribution setting unit that sets a distribution ratio of an input current value supplied from the driver unit to each of the first piezoelectric pump and the second piezoelectric pump, wherein
the distribution setting unit sets a current ratio of the input current value for the second piezoelectric pump to the input current value for the first piezoelectric pump to a value greater than 1 and equal to or lower than 1.25.
11. The pump device according to claim 10 , wherein
the distribution setting unit sets the current ratio of the input current value for the second piezoelectric pump to the input current value for the first piezoelectric pump to a value between 1.05 and 1.17 inclusive.
12. The pump device according to claim 10 , wherein
the first piezoelectric pump and the second piezoelectric pump have a same rated output.
13. A pump device comprising:
a first piezoelectric pump;
a second piezoelectric pump;
a third piezoelectric pump, wherein the second piezoelectric pump and the third piezoelectric pump are connected in series to the first piezoelectric pump and to the second piezoelectric pump on an upstream side of the first piezoelectric pump and the second piezoelectric pump, respectively;
a driver unit that supplies alternating-current input power to the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump; and
a distribution setting unit that sets a distribution ratio of the input power supplied from the driver unit to the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump,
wherein the distribution setting unit sets a power ratio of the input power of at least two adjacent piezoelectric pumps among the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump such that the input power of any piezoelectric pump on a downstream side is lower than the input power of an adjacent piezoelectric pump on the upstream side.
14. The pump device according to claim 13 , wherein the distribution setting unit sets a power ratio of the input power of all two adjacent piezoelectric pumps among the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump such that the input power of any piezoelectric pump on a downstream side is lower than the input power of an adjacent piezoelectric pump on the upstream side.
15. The pump device according to claim 13 , wherein
the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump have a same rated output.
16. The pump device according to claim 13 , wherein
the driver unit comprises a first driver, a second driver, and a third driver, each configured to supply alternating-current input power to the first piezoelectric pump, the second piezoelectric pump, the third piezoelectric pump, respectively.
17. The pump device according to claim 13 , wherein
the driver unit comprises a single common driver configured to supply alternating-current input power to the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump.
18. The pump device according to claim 13 , further comprising a controller configured to control the driver unit.
19. The pump device according to claim 18 , wherein the controller is configured to control at least one of the input power, an input voltage, or an input current inputted from the driver unit to each of the first piezoelectric pump, the second piezoelectric pump, and the third piezoelectric pump.
20. The pump device according to claim 18 , wherein the distribution setting unit comprises the controller and the driver unit.