Cylindrical Diaphragm Valve Reducing Deformation and Dust
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing diaphragm valves with disc-shaped diaphragms face issues of significant deformation, dust generation, substantial volume change during fluid passage opening and closing, and a large pressure receiving surface area at closure.
Innovation Solution
A diaphragm valve with a cylindrical diaphragm made of synthetic resin, featuring a cylindrical portion, a bottom wall, a flange, and a projecting portion, where the axially intermediate portion has a substantially arcuate shape, allowing for reduced deformation and maintaining the cylindrical shape during operation, thus minimizing dust generation and volume change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disc-shaped diaphragm is used, then the fluid passage can be opened and closed, but the amount of deformation is significant and dust is liable to be generated
Solution Approach 1:
The diaphragm is divided into functionally distinct zones: a deformation region (cylindrical portion with arcuate cross-section) that absorbs dimensional changes, and a sealing region (peripheral flange and projecting portion) that maintains shape integrity. This segmentation allows the sealing surfaces to remain stable while the body undergoes necessary deformation for opening/closing operations.
Solution Approach 2:
Different portions of the diaphragm are given different structural properties: the cylindrical portion has an arcuate cross-section designed for deformation, while the peripheral flange and projecting portion maintain rigid, shape-stable structures optimized for sealing. This local differentiation ensures that deformation occurs where needed without compromising seal integrity or generating dust.
2Reliability
If a disc-shaped diaphragm is used, then the fluid passage can be opened and closed, but the change in volume is significant
Solution Approach 1:
The diaphragm structure separates volume-changing functions from volume-stable functions. The cylindrical deformation region accommodates volume changes through its arcuate cross-section compression, while the peripheral sealing regions maintain constant volume characteristics, thereby stabilizing the overall fluid passage volume during operation.
Solution Approach 2:
The peripheral flange and projecting portion are designed with shape-stable geometric characteristics that resist volume change, while the central cylindrical portion is designed to deform. This local quality differentiation ensures that volume changes are localized and controlled, preventing significant overall volume variation in the fluid passage.
3Reliability
If a disc-shaped diaphragm is used, then the fluid passage can be closed, but the pressure receiving surface area is large
Solution Approach 1:
The sealing function is extracted from the entire diaphragm surface and concentrated at the peripheral flange and projecting portion. This allows the majority of the diaphragm surface (the cylindrical deformation region) to be excluded from pressure receiving areas, thereby reducing the pressure receiving surface area while maintaining effective closure through the specialized sealing periphery.
Solution Approach 2:
Pressure resistance is localized to the peripheral sealing regions rather than distributed across the entire diaphragm surface. The peripheral flange and projecting portion are designed with geometric characteristics optimized for pressure reception and sealing, while the central cylindrical portion is optimized for deformation with minimal pressure receiving area, thus reducing overall pressure load.
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 cylindrical diaphragm design reduces deformation, dust generation, and pressure receiving surface area, enhancing durability and operational efficiency by maintaining a smaller deformation and volume change while ensuring effective fluid passage control.
Implementation Method 1
the axially intermediate portion of the cylindrical portion can be resiliently deformed (deformed by compression) easily in an axial direction
Data Source
AI summary
A diaphragm valve which can solve problems of a disc-shaped diaphragm, wherein the amount of deformation is significant and dust is liable to be generated, that the change in volume in opening and closing of the fluid channel is significant, and that a pressure receiving surface area of the diaphragm at the time of channel closure is provided. A diaphragm is formed of a synthetic resin and, a cylindrical portion fixedly fitted on a valve rod, a bottom wall portion closing a lower end opening of the cylindrical portion, a flange portion provided at an upper end portion of the cylindrical portion, and a projecting portion provided at a center portion of the bottom wall portion and facing an upper end opening of a fluid inlet passage. A vertical cross-sectional shape of an axially intermediate portion of the cylindrical portion is formed into a substantially arcuate shape projecting radially outward.