Piezoelectric Pump Plate Vibration Check Valve Flow Rate
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Solution Overview
Problem
Existing piezoelectric pumps face limitations in increasing flow rate due to high flow path resistance and insufficient check valve opening/closing performance, particularly when check valves are attached to central holes on the vibration plate, and when multiple check valves are distributed across the intermediate and peripheral regions, leading to reduced displacement and flow rate.
Innovation Solution
The design incorporates a configuration where the first plate-shaped body undergoes bending vibration with check valves attached to specific hole portions, while the second and third plate-shaped bodies have holes without check valves, arranged to maximize antinode and node alignment, reducing flow path resistance and enhancing differential pressure for effective check valve operation, thereby increasing flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If check valves are attached to hole portions in the central portion of the vibration plate, then check valve opening/closing performance is improved, but flow path resistance increases and flow rate is limited
Solution Approach 1:
The invention divides the hole portions into two categories: those with check valves and those without. Specifically, a first hole portion has a check valve attached while a second hole portion does not have a check valve. This segmentation allows the system to have both reliable check valve operation (at the first hole portion) and low flow path resistance (at the second hole portion), thereby resolving the contradiction between reliability and productivity.
2Productivity
If multiple hole portions with check valves are provided in the intermediate portion of the vibration plate, then flow path resistance is reduced, but displacement amount decreases and check valve opening/closing becomes insufficient
Solution Approach 1:
The invention applies local quality by providing check valves only at specific locations (first hole portion) where they are most needed for reliable operation, while leaving other locations (second hole portion) without check valves to maintain low flow path resistance. This localized approach ensures that check valve opening/closing performance is sufficient where required, while overall flow rate is maximized.
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 effectively reduces flow path resistance and ensures sufficient check valve opening/closing, resulting in a higher flow rate compared to existing techniques by optimizing the arrangement of check valves and holes on the vibration plates.
Implementation Method 1
a piezoelectric pump using a piezoelectric element as a driving body for driving a vibration plate
Implementation Method 2
the vibration plate is driven at a resonant frequency by applying an AC voltage having a predetermined frequency to the piezoelectric element, which leads a pressure fluctuation in the pump chamber
Data Source
AI summary
A pump includes a first pump chamber defined by a first plate-shaped body and a second plate-shaped body, a second pump chamber defined by the first plate-shaped body and a third plate-shaped body, and a driving body. The driving body causes a pressure fluctuation, by causing the first plate-shaped body to undergo bending vibration, in both the first pump chamber and the second pump chamber. The first plate-shaped body is provided with a plurality of first hole portions that does not overlap with an axis orthogonal to the central portion of the first plate-shaped body, and a check valve is attached to each of the plurality of first hole portions. The second plate-shaped body and the third plate-shaped body are respectively provided with second hole portions and third hole portions, and no check valve is attached to the second hole portions and the third hole portions.