Pressure Flowmeter Sealing Structure for Stable Flow Characteristics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pressure type flowmeters using sheet-like sealing components face challenges in achieving desired sealing performance due to thickness tolerances, which can lead to deformation of the fluid resistance element and alterations in flow rate characteristics, and increasing pressure to improve sealing risks further deformation.
Innovation Solution
Incorporating protrusions on the fluid resistance element or sandwiching components to partially press the sheet-like sealing components, reducing the load on the fluid resistance element and enhancing sealing performance without deforming it, while using fluorine-based resin for the sealing components for corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the force of pressing the sealing component is increased to improve sealing performance, then sealing performance is improved, but the fluid resistance element would be deformed and the flow rate characteristic would change
Solution Approach 1:
The pressing force is applied locally at specific positions (outer peripheral portion and central portion) rather than uniformly across the entire sealing component. This localized pressing approach ensures adequate sealing at critical locations while preventing excessive force from deforming the fluid resistance element, thus resolving the contradiction between sealing performance and flow rate characteristic stability
Solution Approach 2:
The pressing action is segmented into multiple discrete pressing portions (first pressing portion at the outer peripheral portion and second pressing portion at the central portion) rather than a single uniform pressing force. This segmentation allows different regions to be pressed with appropriate force levels, achieving sealing without deformation
2Reliability
If the sealing component is pressed uniformly to ensure sealing, then sealing is achieved, but the load on the fluid resistance element increases causing deformation
Solution Approach 1:
Instead of uniform pressing, the invention applies pressing force only at specific critical locations (outer peripheral portion and central portion) where sealing is most needed. This localized approach achieves sealing performance while minimizing the overall load on the fluid resistance element, preventing structural deformation
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 solution effectively improves sealing performance without adversely affecting the flow rate characteristics of the fluid resistance element, maintaining its integrity and stability, and reduces the risk of contamination by using a single annular ridge protrusion.
Implementation Method 1
a protrusion that partially presses the sealing component is formed on at least one of the fluid resistance element and the pair of sandwiching components
Data Source
AI summary
A pressure type flowmeter includes a fluid resistance element provided in a flow path through which fluid flows, and in which a resistance flow path communicating with the flow path is formed, an upstream-side pressure sensor that detects upstream-side pressure of the fluid resistance element, and a downstream-side pressure sensor that detects downstream-side pressure of the fluid resistance element, in which the fluid resistance element is sandwiched and fixed by a pair of sandwiching components sealing components having a sheet-like shape are provided between the fluid resistance element and the sandwiching components and protrusions that partially press the sealing components are formed on at least one of the fluid resistance element and the sandwiching components.