Piezoelectric Pump Diaphragm Valve Layout for Flow Rate
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Solution Overview
Problem
Piezoelectric pumps face limitations in increasing flow rate due to high flow path resistance and insufficient check valve action, particularly when check valves are placed in central regions or distributed in intermediate and peripheral regions of diaphragms, leading to reduced displacement and inefficient fluid transfer.
Innovation Solution
The design incorporates a configuration where the first, second, and third diaphragms are arranged to generate standing waves with antinodes in central and peripheral regions, with check valves strategically placed in regions overlapping or not overlapping nodes of vibration, allowing for reduced flow path resistance and enhanced check valve action, thereby increasing flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If check valves are provided in the central region of the diaphragm, then the pump structure is simplified, but the flow path resistance increases and flow rate is limited
Solution Approach 1:
The invention divides the diaphragm into multiple regions (central region, intermediate region, and peripheral region) and provides hole portions in different regions with different configurations. Specifically, multiple first hole portions are provided in the intermediate region and multiple second hole portions are provided in the peripheral region, allowing each region to contribute differently to fluid flow and reducing overall flow path resistance while maintaining structural organization
Solution Approach 2:
The invention transitions from a single central hole configuration to a multi-dimensional distribution of hole portions across different radial regions of the diaphragm. By arranging hole portions in annular patterns at different radii (intermediate region for suction, peripheral region for discharge), the system exploits the radial dimension to create multiple flow paths that reduce resistance and increase flow rate
2Productivity
If hole portions with check valves are provided in the intermediate region excluding central and peripheral regions, then flow path resistance is reduced, but diaphragm displacement in this region is smaller and check valve action is insufficient
Solution Approach 1:
The invention applies different characteristics to different regions of the diaphragm: the intermediate region (first hole portions) is optimized for suction with larger diaphragm displacement, while the peripheral region (second hole portions) is optimized for discharge with smaller displacement. Each region's hole portions are configured according to local displacement characteristics, ensuring reliable check valve action in each zone
Solution Approach 2:
The invention combines multiple hole portions in the intermediate region with multiple hole portions in the peripheral region to create a unified pump system. The first hole portions and second hole portions work together in sequence during the pump cycle, with fluid being suctioned through the first hole portions and discharged through the second hole portions, achieving both reduced flow path resistance and sufficient check valve action
3Productivity
If multiple hole portions with check valves are provided in the diaphragm, then flow rate increases, but the device complexity increases
Solution Approach 1:
The invention employs asymmetric arrangement of hole portions relative to the diaphragm center, with first hole portions positioned in the intermediate region and second hole portions positioned in the peripheral region. This asymmetric, region-based configuration allows for systematic organization of multiple valves while maintaining manufacturing feasibility and structural coherence
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 significantly reduces flow path resistance and improves the action of check valves, resulting in a higher flow rate and efficient fluid transfer compared to traditional designs.
Implementation Method 1
a piezoelectric element is attached to one of the diaphragms constituting the pair... an AC voltage having a predetermined frequency is applied to the piezoelectric element to drive the diaphragm at a resonant frequency
Implementation Method 2
The diaphragms constituting the pair are caused to perform flexural vibration to be displaced in opposite directions by a piezoelectric element and pressure changes thus occur in a pump chamber
Data Source
AI summary
A pump includes a first pump chamber formed by a first plate member and a second plate member, a second pump chamber formed by a first plate member and a third plate member, and a driving member. The driving member causes the first plate member to perform flexural vibration, thereby causing pressure changes in both of the first pump chamber and the second pump chamber. The first plate member is provided with first hole portions not overlapping an axial line orthogonal to a central region of the first plate member, and a check valve is provided to each of the first hole portions. The second plate member and the third plate member are provided with a second hole portion and a third hole portion respectively, and the check valve is provided to at least one of the second hole portion and the third hole portion.