In order to explore the pump chamber initial volume influence on the performance
of piezoelectric pump, the check-valved double-chamber piezoelectric pumps in parallel with
six different initial pump chamber volumes were designed and manufactured . When powered
by 110V drive voltage, within operating frequency range of less than 400Hz, the output
performance experiments under different compression ratios were carried out with water and
air as the medium respectively. The results showed that the compression ratio(The ratio
between the stroke volume and the initial volume defines the compression) of 1 / 18 of pump
output flow rate was the best when pumping liquid water, the maximum output flow was
1330 ml/min .While the larger compression ratio was , the better the pump output pressure
and self-priming capability were. The maximum self-priming water column height and output
pressure were 69 cm and 58.5 kPa respectively . When pumping gas air, the larger the
compression ratio was, the better the pump output capability was. The maximum output
flow-rate and output pressure was 850 ml/min and 6.5 kPa respectively. When the
compression ratio was less than 1 / 32, the pump had lost output capability.
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