Valve Support Geometry for Thermal Gap-Free Valve Contact
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Solution Overview
Problem
Existing valve structures in micropumps experience gaps between the central plate hole and the valve mechanism due to differences in linear expansion coefficients, leading to unintended fluid flow when the valve mechanism shifts away from the central plate under temperature changes.
Innovation Solution
A valve component design featuring a first metal plate with a through hole and a second metal plate having a base, valve body, and valve supports that are joined in a specific positional relation, with intermediate parts extending away from the reference center line to absorb compressive forces and maintain contact with the through hole edge, preventing gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve mechanism is designed with a linear expansion coefficient larger than the central plate to generate urging force, then the contacting part is brought into contact with the hole periphery, but a gap may come into existence between the hole and valve mechanism when the valve mechanism expands under high-temperature environment
Solution Approach 1:
The patent changes the geometric parameters of the valve support structure by extending the intermediate part farther away from the reference center line than the base-side end and valve body-side end. This asymmetric extension creates a mechanical constraint that prevents the valve mechanism from shifting away from the central plate during thermal expansion, while still allowing the urging force to close the hole reliably
Solution Approach 2:
The extended intermediate part of the valve support acts as an intermediary element between the base and the valve body. This intermediate structure absorbs and redistributes the thermal expansion forces, preventing direct separation between the valve mechanism and the central plate while maintaining the closing function
2Force
If the fixing plate has lower mechanical rigidity than the central plate to allow valve plate compression, then the contacting part approaches the hole under compressive stress, but the valve mechanism may shift away under thermal expansion
Solution Approach 1:
The patent applies local quality by creating a specific structural feature (the extended intermediate part) at a localized position of the valve support. This local structural modification provides differential constraints: allowing compression movement toward the hole while preventing expansion movement away from the hole, thus resolving the contradiction between force generation and positional stability
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
Prevents gaps between the through hole and valve body by maintaining contact under thermal expansion and contraction, ensuring reliable fluid regulation without external forces.
Implementation Method 1
differences in linear expansion coefficients, leading to unintended fluid flow when the valve mechanism shifts away from the central plate under temperature changes
Data Source
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AI summary
A valve component includes: a first metal plate (31, 33) having a through hole (3A3, 3B3); and a second metal plate (32) including: a base (32a) having a passing hole (3A4, 3B4) in a region overlapping the through hole (3A3, 3B3); a valve body (3A5, 3B5) configured to close the passing hole (3A3, 3B3); and a pair of valve supports (3A6, 3B6) that support the valve body (3A5, 3B5) to the base (32a) in such a manner that the valve body (3A5, 3B5) is located in the passing hole (3A4, 3B4). The second metal plate is joined to the first metal plate (31, 33) in such a manner that the valve body (3A5, 3B5) faces an edge portion defining the through hole (3A3, 3B3). Each of the valve supports (3A6, 3B6) has a base-side end (3A7, 3B7), an intermediate part (3A3, 3B8), and a valve body-side end (3A9, 3B9). Each of the ends has a center line (C1, C2) with respect to width directions and a width which is smaller than a width of each of the valve body (3A5, 3B5) and the base (32a), the center line agreeing with a reference center line (S) passing through the center (O) of the valve body (3A5, 3B5). The intermediate part (3A8, 3B8) extends away from the reference center line (S) in directions perpendicularly intersecting the reference center line (S). The first metal plate (31, 33) includes a through section (3A10) intersecting the reference center line (S) and penetrating through the intermediate part (3A8, 3B8) in plate thickness directions.