Fluid Resistance Element Mounting to Prevent Vibration and Drift
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Solution Overview
Problem
Conventional methods for fixing ceramic restrictors in fluid control devices face challenges such as positional displacement and vibration, leading to variations in response performance and measured flow rates.
Innovation Solution
A fixing mechanism that includes an element holder, a holder mounting portion, and a seal member, where the seal member is crushed to secure the fluid resistance element, reducing positional displacement and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ceramic restrictor is fixed using a divided flow path block with O-ring sealing, then the ceramic restrictor can be positioned in the internal flow path, but positional displacement and vibration occur leading to variation in response performance
Solution Approach 1:
An element holder is introduced as an intermediary component between the ceramic restrictor and the flow path block. The holder mounts the ceramic restrictor and positions it within a recessed portion of the flow path block, eliminating direct contact between the ceramic restrictor and sealing components. This intermediary structure prevents positional displacement and vibration while maintaining ease of assembly through standardized mounting interfaces.
Solution Approach 2:
The fixing structure is segmented into distinct functional components: the element holder for mounting the ceramic restrictor, the recessed portion in the flow path block for positioning, and the seal member for sealing. This segmentation allows each component to perform its specific function optimally - the holder provides stable mounting, the recessed portion ensures precise positioning, and the seal member prevents leakage without causing displacement.
2Reliability
If the ceramic restrictor is fixed by sandwiching an O-ring between divided blocks, then sealing is achieved, but the ceramic restrictor vibrates due to fluid pressure causing flow rate fluctuation
Solution Approach 1:
The element holder acts as a mediator that absorbs fluid pressure forces, preventing direct transmission of pressure-induced vibrations to the ceramic restrictor. The holder is securely mounted in the recessed portion with sealing, creating a stable mounting structure that isolates the ceramic restrictor from pressure fluctuations, thereby eliminating vibration and ensuring accurate flow rate measurement.
Solution Approach 2:
The recessed portion structure provides beforehand cushioning by creating a sealed chamber that dampens pressure fluctuations before they reach the ceramic restrictor. The seal member in the recessed portion establishes a stable pressure environment, cushioning the ceramic restrictor from direct pressure exposure that would cause vibration and measurement error.
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 mechanism effectively fixes the fluid resistance element, minimizing variations in response performance and measured values by preventing displacement and vibration.
Implementation Method 1
a seal member interposed between the element holder and a surface facing the element holder in the holder mounting portion, and in a state where the seal member is crushed by the element holder and the surface
Data Source
AI summary
According to the present invention, it is possible to fix a fluid resistance element to a flow path while reducing positional displacement or vibration of the fluid resistance element in the flow path. A fixing mechanism that fixes a fluid resistance element to an internal flow path includes: an element holder that holds the fluid resistance element; a holder mounting portion that is formed to communicate with the internal flow path in a flow path block and on which the element holder is mounted; and a seal member interposed between the element holder and the holder mounting portion. In a state where the seal member is crushed by the element holder and a surface facing the element holder in the holder mounting portion, the element holder is positioned and mounted on the holder mounting portion.