Pump device

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.

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.