Ceramic Fluid Resistance Element With Metal Covering for Stable Flow
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Solution Overview
Problem
Existing fluid resistance elements, particularly those made of metal and ceramic, face challenges in achieving uniform resistance characteristics and stability when incorporated into fine flow paths, with ceramic elements being prone to damage and metal elements experiencing thermal expansion issues.
Innovation Solution
A fluid resistance element comprising a ceramic flow path forming member with a metal covering member, allowing for high-dimensional accuracy and stability, with the ceramic member processed into pieces for uniform resistance and the metal covering providing a buffer during assembly, enabling secure fitting without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic fluid resistance element is fitted into a very thin flow path without a gap, then the thermal expansion coefficient is low and corrosion resistance is high, but the ceramic element is broken or damaged
Solution Approach 1:
A metal covering member is introduced as an intermediary between the ceramic flow path forming member and the flow path wall. This metal layer absorbs installation stress and prevents direct contact between the brittle ceramic and the flow path wall, eliminating the damage risk while maintaining the corrosion resistance benefits of ceramic
Solution Approach 2:
The invention creates a composite structure combining ceramic and metal materials. The ceramic inner layer provides corrosion resistance and low thermal expansion, while the metal outer layer provides mechanical protection and stress absorption, achieving both reliability and strength simultaneously
2Ease of manufacture
If a metal slit plate is sandwiched between covering plates, then the flow path can be formed, but the slit plate is slightly bent and resistance characteristics are changed
Solution Approach 1:
The invention changes the material parameter from metal to ceramic for the flow path forming member. Ceramic materials maintain their dimensional stability and resistance characteristics under clamping pressure, preventing the bending and characteristic changes that occur with metal slit plates while still allowing flow path formation
3Measurement precision
If a ceramic fluid resistance element is used for ultra-low flow rate measurement, then measurement precision is improved, but the element is prone to damage during incorporation
Solution Approach 1:
The metal covering member serves as a protective intermediary that enables the fragile but precise ceramic element to be installed and used for ultra-low flow rate measurement without damage risk
Solution Approach 2:
The composite structure combines the measurement precision advantages of ceramic with the mechanical durability advantages of metal, making ultra-low flow rate measurement practical and reliable
Data Source
AI summary
To make it possible to incorporate a fluid resistance element into a flow path through which a fluid flows without difficulty while enjoying advantages from forming a resistance flow path using ceramic, provided is a fluid resistance element including: a ceramic flow path forming member having one or a plurality of resistance flow paths; and a metal covering member covering an outer peripheral face of the flow path forming member.