Compact Fluid Control Device with Piezoelectric Actuation
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Summary
Problems
Conventional pneumatic fluid control devices are bulky, noisy, and unsuitable for miniaturization, failing to meet the requirements for portable and compact applications, and their performance is affected by temperature changes.
Innovation solutions
A slim and silent fluid control device design incorporating a piezoelectric actuator with a suspension plate and resonance plate, where the linear expansion coefficients of the materials are carefully selected to minimize thermal deformation, ensuring consistent pressure-flowrate characteristics across a broad temperature range, and featuring a gap between the outer frame and resonance plate to enhance fluid flow and reduce noise.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional motors or pressure valves are used in pneumatic devices, then the devices can transfer gases effectively, but the devices become bulky and generate annoying noise
Why choose this principle:
The patent replaces conventional motors and pressure valves with a piezoelectric actuator that directly drives a diaphragm to create pressure changes for gas transfer. This substitution of the mechanical drive system with a piezoelectric system eliminates the need for bulky motors while maintaining gas transfer functionality, thereby reducing overall device volume.
Principle concept:
If conventional motors or pressure valves are used in pneumatic devices, then the devices can transfer gases effectively, but the devices become bulky and generate annoying noise
Why choose this principle:
The patent utilizes the piezoelectric effect to convert electrical signals into mechanical deformation of the diaphragm, creating pressure changes for gas flow. By changing the driving mechanism from rotational motors to piezoelectric actuation, the system achieves compact size while maintaining productivity.
Application Domain
Data Source
AI summary:
A slim and silent fluid control device design incorporating a piezoelectric actuator with a suspension plate and resonance plate, where the linear expansion coefficients of the materials are carefully selected to minimize thermal deformation, ensuring consistent pressure-flowrate characteristics across a broad temperature range, and featuring a gap between the outer frame and resonance plate to enhance fluid flow and reduce noise.
Abstract
A fluid control device includes a piezoelectric actuator (2), a housing (1) and a glue body (5). The piezoelectric actuator (2) includes a suspension plate (21), an outer frame (23), a bracket (24) and a piezoelectric element (22). The housing (1) includes an outlet plate (11) and a base (12). The outlet plate (11) accommodates the piezoelectric actuator (2) and the base (12) includes an inlet plate (121) and a resonance plate (122). The glue body (5) is arranged between the outer frame (23) and the resonance plate (122) to maintain a gap (h) formed therebetween. The suspension plate (21) is made of a material having a linear expansion coefficient less than a linear expansion coefficient of the piezoelectric element (22). The suspension plate (21) has a specified hardness to maintain curved after being heated, and the linear expansion coefficient of the suspension plate (21) is different from a linear expansion coefficient of the resonance plate (122), so that an effective deformation displacement (δ) between the suspension plate (21) and the resonance plate (122) is obtained.