Miniature Blower Noise Reduction via Piezoelectric Resonance
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Solution Overview
Problem
Conventional miniature blowers generate noise due to high-frequency vibrations during operation, making them unsuitable for being both portable and quiet.
Innovation Solution
A miniature blower design incorporating a soft sheet, nozzle plate, chamber frame, actuator body, insulation frame, and conductive frame, where a piezoelectric carrier plate and conductive frame are alternately voltage-driven to create resonance, reducing noise through controlled vibration and gas flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional blowers use high-frequency vibration to discharge gas, then gas transmission is achieved, but noise is generated making the blower unsuitable for portable and quiet applications
Solution Approach 1:
The patent applies mechanical vibration principle by using a piezoelectric actuator to generate controlled vibrations in the nozzle plate, which creates acoustic resonance in the resonance chamber to drive gas flow without high-frequency mechanical vibration that causes noise
Solution Approach 2:
The patent changes the operating parameters by using alternating voltage application to the piezoelectric actuator, controlling the vibration frequency and amplitude of the nozzle plate to achieve resonance at optimal parameters that maximize gas flow while minimizing noise
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 design significantly reduces noise levels from 50 dB to 30 dB or lower while increasing gas flow rate from 150 ml/s to 200 ml/s, achieving a silent and efficient gas transmission.
Implementation Method 1
the piezoelectric carrier plate is used to be applied with a first voltage and a second voltage so as to drive the piezoelectric plate to bend and vibrate reciprocatingly
Implementation Method 2
the actuator body is driven and thus brings the nozzle plate to resonate, so that the suspension portion of the nozzle plate bends and vibrates reciprocatingly
Data Source
AI summary
A miniature blower includes a soft sheet, a nozzle plate, a chamber frame, an actuator body, an insulation frame, and a conductive frame. The nozzle plate has a suspension portion, and the soft sheet is disposed on the suspension portion. The chamber frame is disposed on the nozzle plate. The actuator body includes a piezoelectric carrier plate, an adjusting resonance plate, and a piezoelectric plate. The actuator body is disposed on the chamber frame. The insulation frame is disposed on the actuator. The center point of a central hole of the soft sheet and the center point of a hollow hole of the suspension portion are located at the same axis.