A Piezoelectric Driven Pump Utilizing Lightweight Ball Valves

Abstract

The invention discloses a piezoelectric driving pump using a light ball valve. The piezoelectric driving pump comprises a piezoelectric ceramic piece, a piezoelectric vibrator, a connector, a rubber film, a PDMS thin film and seven layers of square acrylic plates, wherein the third acrylic plate, the fourth acrylic plate and the fifth acrylic plate are each provided with a fluid channel, a small ball is arranged in the fluid channel in the fourth acrylic plate and floats or sinks along with decreasing or increasing of the volume of a cavity body of a lower pump cavity, and therefore the smallball has the one-way ball valve effect in the fluid channels. A buffer cavity is arranged at the pump water in-out opening position, energy losses caused by inertia force of the fluid are reduced, high frequency work of the pump is achieved, the high-frequency high-power density character of piezoelectric ceramic is achieved, and the pump performance is improved. The small ball is made of a polystyrene material, the acrylic plates forming the cavity body of the piezoelectric is made of PMMA materials, the structure is simple, and the acrylic plates can be used for disposable and economical piezoelectric pumps.

Description

technical field [0001] The invention belongs to the field of piezoelectric pumps, in particular, it relates to a piezoelectric driven pump utilizing a lightweight ball valve. Background technique [0002] Piezoelectric pumps are a new type of fluid actuator. Large flow, high back pressure, and economical micropumps are in great demand in microelectromechanical devices such as chemical analysis, fuel cells, and water cooling circulation systems. In recent decades, a variety of micropumps have emerged, among which the piezoelectric pump is the most typical one, which has significant advantages, such as simple structure and no electromagnetic interference. [0003] The driving frequency of the existing piezoelectric pump is limited by the response frequency of the valve and the inertia of the system, and it is difficult to achieve a higher operating frequency. If it exceeds 1kHz, it is difficult to achieve the high frequency and high power density characteristics of piezoelect...

AI Technical Summary

Problems solved by technology

[0004] In order to improve the working frequency and output performance of the piezoelectric pump and solve the problem that the traditional piezoelectric pump is difficult to realize the high-frequency and high-power density characteristics of piezoelectric ceramics, the invention provides a piezoelectric-driven pump using a lightweight ball valve

Images