Piezoelectric Micropump Case Mounting Surface Design
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Solution Overview
Problem
Fluid control devices, decompression devices, and compression devices often generate undesirable sounds and face durability issues due to pressure differences causing deformation and movement, which can lead to stress on the pump and deterioration of the fixing mechanism.
Innovation Solution
The devices are designed with a case having a top plate, side plate, and bottom plate that surround an internal space, with the pump dividing it into regions, and a fixing member that suppresses movement caused by pressure differences by using the top or bottom plate as a mounting surface, reducing deformation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the case is fixed using the side plate as a mounting surface, then the device can be assembled, but deformation occurs in the top or bottom plate due to pressure differences causing noise and durability issues
Solution Approach 1:
The patent extracts the mounting function from the side plate and relocates it to the top or bottom plate, which serves as a dedicated mounting surface. This separation allows the side plate to focus on its primary structural role while the top/bottom plate handles the fixing function, preventing deformation in pressure-sensitive areas.
Solution Approach 2:
The patent applies different functional qualities to different parts of the case: the top or bottom plate is designed with enhanced rigidity and structural characteristics suitable for mounting, while the side plate maintains its original structural role. This localized functional differentiation prevents deformation at critical mounting points.
2Power
If the pump generates large pressure differences to achieve high fluid pressure, then compression performance is improved, but deformation occurs in the case surfaces causing frictional noise
Solution Approach 1:
The patent separates the high-pressure generation function from the case structure by providing a dedicated mounting surface on the top or bottom plate. This allows the pump to generate large pressure differences without transmitting deformation forces to the case surfaces, eliminating the source of frictional noise.
Solution Approach 2:
The dedicated mounting surface acts as an intermediary between the pump and the case structure. It absorbs and distributes the mechanical stresses generated by high-pressure operation, preventing direct transmission of deformation forces to the case surfaces and eliminating frictional noise.
3Object-affected harmful factors
If the case is fixed rigidly to suppress deformation, then noise is reduced, but stress is transmitted to the pump causing durability issues
Solution Approach 1:
The patent applies rigid fixing only at the dedicated mounting surface on the top or bottom plate, while other parts of the case maintain appropriate flexibility. This localized rigidity suppresses noise-generating deformation without transmitting excessive stress to the pump, preserving its durability.
4Object-affected harmful factors
If the mounting surface is located on the top or bottom plate, then deformation is suppressed and noise is reduced, but the device complexity increases
Solution Approach 1:
The patent combines the mounting function with the existing top or bottom plate structure, eliminating the need for separate mounting brackets or additional fixing mechanisms. This integration reduces overall device complexity while achieving effective deformation suppression and noise reduction.
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 reduces the occurrence of undesirable sounds and durability issues, enhancing the quietness and durability of the devices by minimizing deformation and stress on the pump, and allowing for a more stable fixing mechanism.
Implementation Method 1
a piezoelectric micropump that includes a piezoelectric actuator
Data Source
AI summary
A fluid control device (1) includes a case (21) including a case top plate, a case side plate, and a case bottom plate and having an internal space (59) and a cavity, a pump (11) provided at a position at which the pump (11) divides the internal space (59) into a bottom-plate-side region and a top-plate-side region, the pump (11) being configured to generate a flow of a fluid between the bottom-plate-side region and the top-plate-side region and control the flow direction of the fluid, and a fixing member (31) that fixes the case (21) in place. The case (21) is mounted on the fixing member (31) by using the case top plate or the case bottom plate as a mounting surface (B).