Microvalve Actuator Ribs for Electrical Isolation and Compact Design
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Solution Overview
Problem
Conventional microvalves face challenges in operating at high overvoltage conditions and require precise assembly, which complicates manufacturability due to their size and weight, limiting their efficiency and reliability.
Innovation Solution
A microvalve design featuring a displaceable member with an elongated arm portion, actuator ribs connected through a central spine, and a hinge portion, along with a channel and elongated openings for electrical isolation, allowing for improved electrical performance and reduced size and weight, enabling operation at higher overvoltage conditions and simplified manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional microvalve structure is used, then basic flow control function is achieved, but electrical performance is poor and size/weight are large
Solution Approach 1:
The microvalve is divided into multiple functional layers including a first substrate with fluid ports, a second substrate with heating elements, and intermediate layers with through-holes. This segmentation allows each layer to be optimized independently for its specific function while reducing overall device volume and improving electrical performance through distributed heating elements.
Solution Approach 2:
The patent transitions from a conventional planar microvalve design to a three-dimensional stacked architecture with multiple substrates and layers. This dimensional change enables compact integration of fluid control and thermal actuation functions, reducing the footprint while improving electrical performance through optimized heating element placement in the vertical dimension.
2Reliability
If conventional microvalve structure is used, then basic flow control function is achieved, but device weight is large
Solution Approach 1:
The microvalve is divided into multiple functional layers including a first substrate with fluid ports, a second substrate with heating elements, and intermediate layers with through-holes. This segmentation allows each layer to be optimized independently for its specific function while reducing overall device volume and improving electrical performance through distributed heating elements.
Solution Approach 2:
The patent employs thin-film fabrication techniques to create the valve structure, using deposited film layers for substrates, heating elements, and sealing layers. This approach significantly reduces material usage and device weight compared to conventional bulk micromachining, while maintaining structural integrity and electrical performance.
3Ease of manufacture
If conventional microvalve assembly method is used, then basic assembly is achieved, but manufacturing precision is poor and assembly is complex
Solution Approach 1:
The patent integrates multiple functions into unified structures: the intermediate layer serves both as a structural support and as a template for through-hole formation that aligns with substrates. The heating elements are integrated directly into the second substrate, eliminating separate actuator components. This merging reduces assembly steps and improves positioning precision through self-alignment.
Solution Approach 2:
The intermediate layer is fabricated first with precisely positioned through-holes that serve as alignment features for subsequent substrate bonding. Heating elements are pre-patterned on the second substrate before assembly. This preliminary action establishes precise geometric relationships early in the manufacturing process, ensuring accurate positioning without requiring complex alignment procedures during final assembly.
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
The design enhances electrical performance, allows operation at higher overvoltage levels, and reduces manufacturing complexities, resulting in improved manufacturability and reliability with a five-fold increase in throughput and reduced scrap rates.
Implementation Method 1
a heating element formed on the intermediate layer and configured to transform electrical energy to thermal energy
Implementation Method 2
an intermediate layer formed between the first substrate and the second substrate... configured to transform thermal energy to mechanical energy
Data Source
AI summary
A microvalve includes a displaceable member having an elongated arm portion, a plurality of actuator ribs connected through a central spine to the elongated arm portion, and a hinge portion. Each of the actuator ribs has a first portion and a second portion, the first portions each having an end connected to the central spine, the second portions each having an end connected to the central spine. A channel is formed in the plate. A plurality of elongated openings is formed in the plate and define the actuator ribs, each elongated opening having longitudinally extending side edges. One of the elongated openings separates each rib in the second portion of ribs from an adjacent rib or the plate. The channel and a longitudinally extending side edge of one of the elongated openings separate the second portion of the actuator ribs from the plate and define an electrical isolation region.