Note: A valve-type piezoelectric reciprocating pump with secondary resonant vibrator

Area of Science:

• Mechanical Engineering
• Materials Science
• Electrical Engineering

Background:

• Piezoelectric diaphragm pumps offer advantages in microfluidics and medical devices.
• Frequency incompatibility between piezoelectric actuators and check valves limits pump efficiency.
• Secondary resonant structures can mitigate these frequency mismatches.

Purpose of the Study:

• To introduce a novel valve-type piezoelectric diaphragm pump utilizing a secondary resonant vibrator.
• To address the frequency incompatibility issue in piezoelectric diaphragm pumps.
• To investigate the performance of the pump under varying operational conditions.

Main Methods:

• Design and fabrication of a piezoelectric diaphragm pump with a dual-stage vibrator system.
• Development of a frequency-tracking control circuit.
• Experimental analysis of vibration displacement and flow rate against driving voltage, frequency, and backpressure.

Main Results:

• The secondary resonant vibrator effectively coordinates frequency differences between piezoelectric elements and check valves.
• Experimental results demonstrate pump performance under various conditions.
• A prototype achieved a flow rate of 13.94 ml/min at a secondary resonant frequency of 6 Hz with a driving voltage of 712 Vpp.

Conclusions:

• The proposed secondary resonant vibrator design is effective in enhancing piezoelectric diaphragm pump performance.
• The frequency-tracking control circuit ensures stable operation.
• This technology shows promise for applications requiring precise fluid handling.