Exploration on relationship between flow rate and sound pressure level of piezoelectric pump

This study presents the relationship between flow rate and sound pressure level of piezoelectric pump. It also presents the analysis and theoretical calculation for umbrella valve piezoelectric pump on the sound pressure level. Sound pressure level of umbrella valve piezoelectric pump in composite field (medium are air and water) was simulated by software Actran. Simulation results reveal that: The sound pressure level of Piezoelectric actuator in air field is bigger than that in water field. This result means that pump chamber with air and water has a higher sound pressure level than pump chamber with water. The flow rate and sound pressure level characteristics of umbrella valve piezoelectric pump with different pump chamber depths (d = 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm) is obtained by experiments in a voltage range of 160-220 V and a frequency range of 160-340 Hz. Experimental results show that: At different pump chamber depth (d), the range of flow rate is from 173.4 to 271.0 mL/min at 0.5 mm chamber depth, 75.0 to 149.0 mL/min at 1.0 mm chamber depth, 3.4 to 57.0 mL/min at 1.5 mm chamber depth, 2.8 to 32.8 mL/min at 2.0 mm chamber depth, the sound pressure level is from 57.52 to 65.14 dB, 54.54 to 60.05 dB, 55.26 to 69.24 dB, 53.39 to 61.19 dB. For piezoelectric pump with different pump chamber depths (d), flow rate and sound pressure level of piezoelectric pump increase as voltage increases. It is a great method to monitoring flow rate by monitoring the sound pressure level.