Annular Valve Piezoelectric Pump Collision Prevention
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Solution Overview
Problem
Piezoelectric pumps face reliability issues due to repeated collisions of valves with outlet port edges, leading to valve damage and performance degradation.
Innovation Solution
The design incorporates annular-shaped valves spaced apart from apertures, preventing collisions and fixing valves to top boards or diaphragm, which reduces vibrations and flow path resistance, enhancing valve longevity and pump reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a film-shaped valve is disposed in the pump chamber to open or close the outlet port, then the pump can control fluid flow, but the valve repeatedly collides against the edge of the outlet port causing damage and reliability degradation
Solution Approach 1:
A valve support structure is introduced as an intermediary component between the valve and the outlet port. The support structure includes a support portion that extends into the pump chamber and a bottom surface that faces the outlet port, creating a protective barrier. The valve is disposed on the support structure at a position spaced apart from the outlet port edge, preventing direct collision while maintaining flow control functionality.
Solution Approach 2:
The valve arrangement transitions from a two-dimensional film-shaped valve directly positioned at the outlet port to a three-dimensional structure where the valve is elevated on a support structure. This vertical displacement positions the valve above the outlet port plane, allowing flow control without direct contact with the outlet port edge, thus eliminating collision damage.
2Productivity
If the valve is positioned close to the outlet port for effective flow control, then flow regulation is improved, but collision damage occurs reducing valve lifespan
Solution Approach 1:
The valve support structure serves as a mediator that maintains the valve's proximity to the outlet port for effective flow control while preventing direct contact. The support structure's bottom surface is positioned close to the outlet port to maintain flow regulation efficiency, while the valve itself is elevated on the support, preventing collision and extending lifespan.
Solution Approach 2:
The valve system is segmented into multiple functional components: the valve itself for flow control, the support structure for positioning and protection, and the connection portion for mounting. This segmentation allows the valve to be positioned optimally for flow control while the support structure handles the protective function, separating the control function from the collision risk.
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 design improves valve durability, reduces vibration loss, achieves high flow rates, and maintains high pressure characteristics by preventing valve damage and optimizing airflow control.
Implementation Method 1
a piezoelectric element causes unimorph bending deformation, and causes pressure changes in the internal spaces in the first pump chamber and the second pump chamber
Data Source
AI summary
A piezoelectric pump includes a first top board, a second top board, a diaphragm, a first side wall, a second side wall, a first valve, and a second valve. The first valve has an annular shape to surround the first aperture while being spaced apart from the first aperture and the second aperture, and is disposed in the first pump chamber between the first aperture and the second aperture when viewed in a plan. The second valve has an annular shape to surround the third aperture while being spaced apart from the third aperture and the fourth aperture, and is disposed in the second pump chamber between the third aperture and the fourth aperture when viewed in a plan.