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Sensors 2019, 19(6), 1301; https://doi.org/10.3390/s19061301

A Novel PZT Pump with Built-in Compliant Structures

1
College of Mechanical and Electrical Engineering, Guangzhou University, Guangzhou 510006, China
2
National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
3
Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
*
Author to whom correspondence should be addressed.
Received: 6 February 2019 / Revised: 10 March 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Section Physical Sensors)
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Abstract

Different to the traditionally defined valved piezoelectric (PZT) pump and valveless PZT pump, two groups of PZT pumps with built-in compliant structures—with distances between the free ends of 0.2 mm (Group A) and 0 mm (Group B)—were designed, fabricated, and experimentally tested. This type of pump mainly contains a chamber 12 mm in diameter and 1.1 mm in height, a PZT vibrator, and two pairs of compliant structures arranged on the flowing channel. The flow-resistance differences between these two groups of PZT pumps were theoretically and experimentally verified. The relationships between the amplitude, applied voltage and frequency of the PZT vibrators were obtained experimentally, with results illustrating that the amplitude linearly and positively correlates with the voltage, while nonlinearly and negatively correlating to the frequency. The flow rate performance of these two groups was experimentally tested from 110–160 Vpp and 10–130 Hz. Results showed that the flow rate positively correlates to the voltage, and the optimum flow rate frequency centers around 90 Hz for Group A and 80 Hz for Group B, respectively. The flow rate performances of Group B were further measured from 60–100 Hz and 170–210 Vpp, and obtained optimal flow rates of 3.6 mL/min at 210 Vpp and 80 Hz when ignoring the siphon-caused backward flow rate. As the compliant structures are not prominently limited by the channel’s size, and the pump can be minimized by Micro-electromechanical Systems (MEMS) processing methods, it is a suitable candidate for microfluidic applications like closed-loop cooling systems and drug delivery systems. View Full-Text
Keywords: PZT pump; valved pump; valveless pump; Compliant structures; flow rate PZT pump; valved pump; valveless pump; Compliant structures; flow rate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bao, Q.; Zhang, J.; Tang, M.; Huang, Z.; Lai, L.; Huang, J.; Wu, C. A Novel PZT Pump with Built-in Compliant Structures. Sensors 2019, 19, 1301.

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