Pressure-Balanced Piezoelectric MEMS Microvalve for 3-Way Flow Control
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Solution Overview
Problem
MEMS-based microvalves face challenges with low actuation forces, limiting their ability to operate effectively in applications requiring higher fluid pressures, as they often need to overcome larger forces, and existing three-way microvalves are not feasible due to the need for multiple two-way valves, which increases size, weight, and power requirements.
Innovation Solution
The development of three-way Micro-Electro-Mechanical Systems (MEMS)-based micro-valve devices employing piezoelectric actuation with a pressure-balancing scheme, allowing for high actuation forces and control of higher fluid pressures using a single actuator, enabling the microvalve to switch states with minimal actuation pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple two-way microvalves are used to achieve three-way functionality, then fluid direction control is enabled, but device size, weight, and power requirements increase
Solution Approach 1:
The patent combines the functionality of multiple two-way microvalves into a single integrated three-way microvalve device. The device includes a unified body with multiple inlet ports and outlet ports, and a single movable membrane that controls fluid distribution among all ports simultaneously, eliminating the need for separate valve assemblies.
Solution Approach 2:
The movable membrane in the three-way microvalve performs multiple functions: it simultaneously controls fluid flow paths between different port combinations (e.g., first inlet to outlet, second inlet to outlet, or blocking both inlets). This multi-functional design allows one component to replace what would traditionally require multiple specialized components.
2Adaptability or versatility
If multiple two-way microvalves are used to achieve three-way functionality, then fluid direction control is enabled, but device complexity increases
Solution Approach 1:
The patent integrates multiple valve functions into a single unified structure where the membrane, body, and port system work together as one cohesive device, reducing the number of separate components and interconnections required.
Solution Approach 2:
The device is segmented into functional zones within a single body: inlet port regions, outlet port regions, and a central membrane chamber. This segmentation allows independent control of different fluid paths while maintaining a compact, integrated structure.
3Device complexity
If conventional microvalve actuators are used, then device simplicity is maintained, but actuation force is insufficient for higher fluid pressures
Solution Approach 1:
The patent employs a piezoelectric actuator that converts electrical energy to mechanical displacement, generating sufficient force to overcome high fluid pressures. The actuator is integrated with the membrane structure, directly translating electrical signals into membrane movement for precise fluid control.
Solution Approach 2:
The piezoelectric actuator enables large actuation forces through material property changes at the microscopic level, achieving high force output in a compact form factor suitable for microvalve applications without increasing overall device complexity.
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 solution enables the implementation of efficient three-way microvalves that can control fluid direction and pressure in various applications, reducing the need for multiple valves and minimizing power and size requirements, while maintaining reliability.
Implementation Method 1
employ piezoelectric actuation
Implementation Method 2
using the fluid under control of the microvalve to pressure balance the actuator
Data Source
AI summary
A three-way (3-way) Micro-Electro-Mechanical Systems (MEMS)-based micro-valve device and method of fabrication for the implementation of a three-way MEMS-based micro-valve which uses a single piezoelectric actuator. The present invention has a wide range of applications including medical, industrial control, aerospace, automotive, consumer electronics and products, as well as any application(s) requiring the use of three-way micro-valves for the control of fluids. The present invention allows for the implementation of a three-way microvalve device and method of fabrication that can be tailored to the requirements of a wide range of applications and fluid types. The microvalve may employ a novel pressure-balancing scheme wherein the fluid pressure balances the actuator mechanism so that only a small amount of actuation pressure (or force) is needed to switch the state of the actuator and device from open to closed, or closed to open.