Piezoelectric Pump Diaphragm Hole Segmentation for Flow Rate
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Solution Overview
Problem
Existing piezoelectric pumps face challenges in increasing flow rate due to limitations in the design of diaphragm structures and hole configurations, which restrict the enlargement of the pump chamber diameter and vibration frequency, making it difficult to enhance pumping efficiency.
Innovation Solution
The design incorporates a first and second diaphragm with specific hole configurations, including a central first hole and annularly arranged second and third holes, along with a piezoelectric device that causes flexural vibration, optimizing the flow path and pressure fluctuation within the pump chamber to increase flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diameter of the pump chamber is enlarged or the vibration frequency of the diaphragm is increased to increase the flow rate, then the flow rate increases, but the product of the radius of the pump chamber and the vibration frequency must satisfy an appropriate value which is difficult to achieve with existing structures
Solution Approach 1:
The single hole in the diaphragm is segmented into multiple holes arranged in a specific pattern. This segmentation allows optimization of the flow path while maintaining the product of radius and vibration frequency within the appropriate range, thereby increasing flow rate without requiring enlargement of the pump chamber diameter or excessive increase in vibration frequency.
Solution Approach 2:
The invention transitions from a single central hole configuration to a multi-hole configuration with specific radial and angular arrangements. This dimensional change in hole distribution optimizes the flow path and pressure distribution, enabling increased flow rate while maintaining the critical product of radius and vibration frequency within appropriate limits.
2Productivity
If the diameter of the pump chamber is enlarged to increase the flow rate, then the flow rate increases, but the product of the radius of the pump chamber and the vibration frequency has to satisfy an appropriate value
Solution Approach 1:
Instead of enlarging the pump chamber diameter, the invention segments the single hole into multiple holes with optimized positions. This allows the flow rate to increase through improved flow path efficiency rather than through chamber enlargement, maintaining the product of radius and vibration frequency within appropriate values.
3Productivity
If the vibration frequency of the diaphragm is increased to increase the flow rate, then the flow rate increases, but the product of the radius of the pump chamber and the vibration frequency has to satisfy an appropriate value
Solution Approach 1:
The invention uses multiple holes with specific angular and radial positions to optimize flow at moderate vibration frequencies. This segmentation allows the system to achieve higher flow rates without excessively increasing vibration frequency, thereby maintaining the product of radius and vibration frequency within appropriate limits.
Solution Approach 2:
The invention changes the flow path parameters by introducing multiple holes with specific positions rather than a single central hole. This parameter change optimizes fluid flow efficiency, allowing increased flow rate at lower vibration frequencies and maintaining the critical product of radius and vibration frequency within appropriate values.
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
This configuration allows for a higher flow rate compared to traditional designs, with a theoretical increase of approximately 20% by optimizing the resonance frequency and reducing flow path resistance, while maintaining axial symmetry and preventing gas leakage.
Implementation Method 1
a piezoelectric device for use as a driver that drives a diaphragm... drives the diaphragm at a resonant frequency by applying an AC voltage of a predetermined frequency to the piezoelectric device
Implementation Method 2
drives the diaphragm at a resonant frequency... causes the first diaphragm and the second diaphragm to vibrate in a flexural mode
Data Source
AI summary
A pump includes a first diaphragm, a second diaphragm, and a circumferential wall, which define a pump chamber, and a driver. The driver vibrates the first diaphragm and the second diaphragm in a flexural mode to cause pressure fluctuation in the pump chamber. The first diaphragm has a first hole to which no check valve is attached. At least one of the first diaphragm and the second diaphragm has a second hole to which a check valve is attached. The first hole is located at a portion that coincides with an axis orthogonal to a center of the first diaphragm and a center of the second diaphragm. The second hole is located at a portion that does not coincide with the first hole when viewed in a direction in which the axis extends.