Piezoelectric Heat Dissipation Device with Low-Deformation Vibration
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Solution Overview
Problem
Piezoelectric ceramics used for heat dissipation in electronic products are prone to failure due to large bending deformations, leading to low reliability and inefficiency.
Innovation Solution
A piezoelectric heat dissipation device with a housing, elastic sheet, and piezoelectric ceramic member, where the elastic sheet separates the cavity into sub-cavities and the ceramic member is positioned to avoid overlapping with the vibration center line, allowing controlled deformation and airflow for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire piezoelectric ceramic is completely attached to the vibration region of the metal sheet, then the heat dissipation function is achieved, but the piezoelectric ceramic is prone to failure due to large bending deformation
Solution Approach 1:
The patent divides the attachment area into two regions: a first attachment region with large area for heat dissipation and a second attachment region with small area for reducing deformation. This segmentation allows the piezoelectric ceramic to maintain heat dissipation functionality while minimizing bending deformation in critical areas.
Solution Approach 2:
The patent applies different attachment characteristics to different regions of the piezoelectric ceramic. The first attachment region has large area for effective heat dissipation, while the second attachment region has small area to reduce bending deformation. This local differentiation optimizes both heat dissipation performance and structural reliability.
2Reliability
If the piezoelectric ceramic is attached to the metal sheet for heat dissipation, then heat dissipation function is achieved, but the device size increases
Solution Approach 1:
The patent uses a flexible metal sheet as the attachment structure, which allows the piezoelectric ceramic to be attached with minimal space occupation. The flexible nature of the metal sheet enables effective heat dissipation while maintaining a compact device structure suitable for miniaturization.
3Productivity
If the piezoelectric ceramic is driven to vibrate for heat dissipation, then heat dissipation efficiency is improved, but noise is generated
Solution Approach 1:
The patent utilizes mechanical vibration of the piezoelectric ceramic to enhance heat dissipation efficiency. The vibration mechanism creates airflow that improves heat transfer, while the controlled vibration amplitude and frequency help minimize noise generation.
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 enhances reliability and efficiency by minimizing bending deformation of the piezoelectric ceramic, reducing failure, and enabling miniaturization with reduced noise, suitable for micro-miniature electronic products.
Implementation Method 1
Piezoelectric ceramic is a ceramic material having a piezoelectric effect, and may be stretched and deformed when applying an electric field to two ends of the piezoelectric ceramic
Implementation Method 2
the elastic sheet is provided with a plurality of first nozzles that correspond to the air outlet, and the elastic sheet has a vibration center line
Data Source
AI summary
A piezoelectric heat dissipation device and an electronic device; the piezoelectric heat dissipation device includes a housing, the housing has an accommodation cavity, the housing is provided with an air inlet and an air outlet being opposite to the air inlet; an elastic sheet, where the elastic sheet is accommodated in the accommodation cavity, and two opposite ends of the elastic sheet are respectively connected to the housing; the elastic sheet has a vibration center line; a piezoelectric ceramic member fixedly connected to the elastic sheet, where a projection of the piezoelectric ceramic member does not overlap with a projection of the vibration center line in a thickness direction of the elastic sheet; and an electric control member electrically connected with the piezoelectric ceramic member and configured to supply power to the piezoelectric ceramic member.