Piezoelectric Pump Chamber Volume Variation Optimization
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Solution Overview
Problem
Existing fluid control devices using piezoelectric bodies face challenges in achieving increased volume variation of the pump chamber and obtaining a large flow rate.
Innovation Solution
The fluid control device incorporates a housing with a pump chamber formed by first and second main plates, where the second main plate has an opening with a rotationally symmetric shape, positioned to overlap the vibration portion of the first main plate, and the opening area is between 10% to 75% of the vibration portion area, thereby suppressing mutual cancellation of volume variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diaphragm and cover plate are disposed to face each other with a predetermined distance, then the pump chamber is formed, but the volume variation is insufficient and flow rate is small
Solution Approach 1:
The invention divides the main plate into a vibration portion and a non-vibration portion, with the vibration portion having a specific area ratio (10% to 75% of the total main plate area). This segmentation allows the vibration portion to generate effective volume variation while the non-vibration portion maintains structural stability, resolving the contradiction between achieving sufficient volume variation and maintaining pump chamber integrity.
Solution Approach 2:
The invention applies different functional characteristics to different regions of the main plate: the vibration portion is designed to undergo significant deformation for volume variation, while the non-vibration portion maintains rigid support. This local differentiation enables the pump chamber to achieve both sufficient volume variation and structural stability, thereby improving flow rate.
2Volume of moving object
If the opening area is large, then volume variation is increased, but pressure is reduced
Solution Approach 1:
The invention optimizes the opening area parameter to a specific range (10% to 75% of the vibration portion area) rather than maximizing it. This parameter optimization balances two competing requirements: sufficient opening area for volume variation and fluid flow, while maintaining adequate pressure. The specific range represents the optimal compromise between these opposing demands.
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 increased volume variation of the pump chamber, resulting in a larger flow rate while maintaining pressure, thus enhancing the fundamental pumping characteristics.
Implementation Method 1
The fluid control device uses a piezoelectric body (30) that is placed on the diaphragm (20). The diaphragm (20) vibrates by the deformation of the piezoelectric body (30), and the volume of the pump chamber (100) varies due to the vibration.
Implementation Method 2
The diaphragm (20) vibrates by the deformation of the piezoelectric body (30), and the volume of the pump chamber (100) varies due to the vibration. The fluid control device uses the volume variation above to suck a fluid from the suction holes (203) and to discharge the fluid from the discharge holes (202).
Data Source
AI summary
A fluid control device has a housing. A first main plate of the housing includes a vibration portion, on which a drive body is disposed, having a rotationally symmetric shape in plan view, and multiple openings which is formed outside the vibration portion and through which a pump chamber and the outside communicate with each other. A second main plate includes an opening through which the pump chamber and the outside communicate with each other and which has a rotationally symmetric shape in plan view. The opening is arranged to include the center of the vibration portion in plan view of the first main plate and the second main plate. An opening area of the opening is from 10% to 75% of an area of the vibration portion.