Piezoelectric Membrane Airflow Device for Thin Electronics Cooling
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Solution Overview
Problem
Conventional fans with rotatory blades are difficult to integrate into thin devices like notebooks, tablets, and cellular phones due to size constraints, leading to impaired heat dissipation and performance.
Innovation Solution
An air flow generating device utilizing a vibrating part and a one-way valve structure, which creates a pressure difference to generate forced airflow without blades, allowing for efficient heat dissipation in compact spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fans with rotatory blades are used for heat dissipation, then heat dissipation function is provided, but device volume becomes large and cannot be integrated into thin devices
Solution Approach 1:
The patent replaces the traditional rotary blade mechanical system with a piezoelectric-driven flexible membrane system. The piezoelectric element converts electrical energy directly to mechanical vibration of the membrane, eliminating the need for rotary motors and blades, thus significantly reducing device volume while maintaining heat dissipation function
Solution Approach 2:
The patent utilizes mechanical vibration of a flexible membrane driven by piezoelectric elements to generate airflow. The vibrating membrane creates pressure differences that drive air through heat dissipation channels, providing effective cooling without requiring large rotary components
2Volume of moving object
If fans with rotatory blades are miniaturized, then device volume is reduced, but installation space is still insufficient for thin devices
Solution Approach 1:
The patent employs a flexible membrane as the core moving component instead of rigid rotary blades. This flexible film structure can be integrated into thin device profiles, conforming to space constraints while providing the necessary airflow generation capability for heat dissipation in ultra-thin devices
3Length of stationary object
If thin devices are designed with limited structure sizes, then device thickness is reduced, but heat dissipation performance is impaired
Solution Approach 1:
The patent transitions from traditional rotary motion in three dimensions to planar vibration of a membrane, effectively utilizing two-dimensional motion to generate airflow. This dimensional change allows the heat dissipation mechanism to be integrated into thin profiles without sacrificing cooling performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves effective heat dissipation and improved performance in thin devices by using a smaller installation space, enhancing the heat-dissipating capabilities of thin notebooks, tablets, and cellular phones.
Implementation Method 1
the vibrating part is driven by a piezoelectric element
Implementation Method 2
uses vibrations of films to generate air pressure difference so as to generate a forced air flow
Data Source
AI summary
An air flow generating device includes an enclosing wall, a frame sheet, a cover film, and a vibrating part. The frame sheet is disposed inside an air flow passage formed by the enclosing wall and closely contacts the air flow passage by its periphery. The cover film includes a central connection portion fixed to a central portion of the frame sheet, and a plurality of movable cover portions connected to the central connection portion. The cover film is between the frame sheet and an outlet of the air flow passage. The movable cover portions selectively cover a plurality of through holes of the frame sheet. The vibrating part is fixed on the frame sheet. When the vibrating part vibrates, the central portion and the central connection portion move together with the vibrating part so that the movable cover portions seal the through holes or move relative to the through holes.