Three-Way MEMS Microvalve With Pressure-Balanced Actuation
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Solution Overview
Problem
MEMS-based micro-valves face challenges with low actuation forces, limiting their ability to operate effectively in applications requiring higher fluid pressures, as they often need to overcome both mechanical stiffness and fluid pressure, which restricts their use to pressures below 1 psi.
Innovation Solution
A three-way MEMS-based micro-valve with a pressure-balancing scheme that allows fluid pressure to balance the actuator mechanism, enabling operation with significantly higher fluid pressures using small actuation forces, such as electrostatic or piezoelectric actuation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MEMS-based micro-valve actuators are used, then the device size is reduced, but the actuation force becomes insufficient for high fluid pressure applications
Solution Approach 1:
The patent applies the counterweight principle by using fluid pressure to balance the actuator mechanism. The fluid pressure acts on a larger area to generate a balancing force that counteracts the mechanical stiffness and load forces, allowing the small MEMS actuator to control high fluid pressure applications despite its limited actuation force capability
2Reliability
If the micro-valve actuator must overcome fluid pressure to open and close, then the device can function as a valve, but the fluid pressure must be smaller than the actuation pressure (less than 1 psi)
Solution Approach 1:
The patent uses fluid pressure to balance the actuator mechanism, creating a counterbalancing effect where the fluid pressure itself helps support the load. This allows the actuator to overcome much higher fluid pressures than would be possible without the pressure-balancing scheme
Solution Approach 2:
The patent introduces a pressure-balancing mechanism as an intermediary between the actuator and the fluid. This intermediary system translates small actuator movements into effective valve control while the fluid pressure balances the mechanical loads, enabling high-pressure operation
3Adaptability or versatility
If multiple separate two-way micro-valves are used to direct fluid flow, then three-way functionality is achieved, but the system complexity, size, weight, and power requirements double
Solution Approach 1:
The patent merges the functionality of multiple two-way valves into a single three-way micro-valve device. By integrating multiple flow paths and control mechanisms into one unified structure, the device achieves three-way fluid direction control while reducing the total number of components, size, weight, and power requirements compared to using separate valves
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
Enables the micro-valve to switch states with minimal actuation pressure, even when fluid pressures are much higher than the actuation pressure, effectively expanding its operational range and reducing the need for multiple valves, thus improving efficiency and reliability.
Implementation Method 1
a typical electrostatically-actuated micro-valve will only generate less than a 1 psi (pound per square inch) of actuation pressure
Implementation Method 2
such as electrostatic or piezoelectric actuation methods
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 are disclosed. The micro-valve device 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 discloses three-way micro-valve device and method of fabrication that can be tailored to the requirements of a wide range of applications and fluid types, and can also use a number of different actuation methods, including actuation methods that have very small actuation pressures and energy densities even at higher fluidic pressures. This is enabled by 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.