Piezoelectric Pump Valve Guide Wall Collision Prevention
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Solution Overview
Problem
Piezoelectric pumps face reliability issues due to valve damage caused by repeated collisions with outlet edges, leading to decreased functionality.
Innovation Solution
A piezoelectric pump design featuring a diaphragm with a vibrating portion, frame portion, and connecting portion, where the first and second pump chambers communicate through a third opening, and annular valves are positioned apart from their respective openings to prevent collisions and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is positioned close to the outlet opening to improve sealing performance, then the sealing function is enhanced, but the valve repeatedly collides with the outlet edge causing damage and reduced reliability
Solution Approach 1:
A guide wall structure is introduced as an intermediary element between the valve and the outlet opening. The guide wall provides a dedicated sliding surface that guides the valve's movement, preventing direct collision with the outlet edge while maintaining effective sealing. The valve slides along the guide wall's inner surface rather than directly contacting the outlet opening edge.
Solution Approach 2:
The valve movement path is modified by adding a vertical dimension through the guide wall structure. Instead of the valve moving in a straight line toward the outlet opening, it now follows a path that includes sliding along the guide wall's inner surface, which is positioned at a distance from the outlet opening. This dimensional change separates the valve's sealing function from its movement path.
2Reliability
If the valve is positioned away from the outlet opening to prevent collision damage, then valve reliability is improved, but sealing performance may deteriorate
Solution Approach 1:
The guide wall acts as an intermediary structure that enables the valve to maintain an offset position from the outlet opening while still achieving effective sealing. The guide wall's inner surface provides a controlled interface for the valve to seal against, ensuring proper sealing function even though the valve is positioned away from the direct outlet opening edge.
3Device complexity
If a film-type valve is used to simplify the structure, then device complexity is reduced, but the valve repeatedly collides with the outlet edge causing damage
Solution Approach 1:
The guide wall structure is added as a simple intermediary element that significantly improves valve durability without adding complex mechanisms. The guide wall provides a protective sliding surface that prevents direct collision damage, extending valve life while maintaining the simplicity of the overall valve structure.
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 extends the life of the valves, reduces vibration leakage, and improves flow rate and pressure characteristics by preventing valve damage and optimizing valve positioning.
Implementation Method 1
when alternating electric power is supplied to the piezoelectric device, the piezoelectric device undergoes bending deformation
Data Source
AI summary
A piezoelectric pump includes a first faceplate, a second faceplate, a diaphragm, a first peripheral wall, and a second peripheral wall. The diaphragm includes a vibrating portion to which a piezoelectric device is attached, a frame portion, and a connecting portion. The connecting portion defines a third opening that allows a first pump chamber and a second pump chamber to communicate with each other. The first pump chamber is provided with an annular first valve surrounding a first opening at a distance from the first opening in plan view from a major surface of the first faceplate toward a major surface of the diaphragm.