Fluororesin Diaphragm Valve Interface to Prevent Clearance
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Solution Overview
Problem
The existing fluid control valves experience displacement and clearance issues due to low bonding strength between the diaphragm member and the valve-seat contact member, leading to chemical liquid residue and particle generation when subjected to repeated pressing forces.
Innovation Solution
A fluid control valve design featuring a diaphragm member and a valve-seat contact member made of fluorine resin materials with a specific engagement surface configuration, including a slanted surface and rotation restriction parts, to prevent displacement and clearance, ensuring secure contact and preventing chemical liquid residue and particle generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diaphragm member and valve-seat contact member are formed by insert molding with flat connected surfaces, then the manufacturing process is simple, but the bonding strength is insufficient causing displacement under pressing force
Solution Approach 1:
The connected surfaces are designed with local unevenness (protrusions and recesses) at specific locations rather than being uniformly flat. This local quality change creates mechanical interlocking features that significantly improve bonding strength at the connection interface while maintaining the overall simplicity of the insert molding process.
Solution Approach 2:
The connected surfaces feature asymmetric protrusions and recesses that create a interlocking pattern. This asymmetry prevents relative displacement between the diaphragm member and valve-seat contact member under pressing force, as the complementary shapes resist movement in all directions, thereby enhancing bonding strength without complicating manufacturing.
2Ease of manufacture
If the connected surfaces are made flat for easy manufacturing, then production is simplified, but clearance generates under repeated pressing force causing particle formation
Solution Approach 1:
By introducing local unevenness with protrusions and recesses at the connection interface, the design creates mechanical constraints that prevent clearance formation under repeated pressing forces. This local structural modification ensures reliable engagement between parts while maintaining manufacturing simplicity through the insert molding process.
Solution Approach 2:
The protrusion of one component fits into the recess of the other component, creating a nested interlocking structure. This nesting arrangement prevents relative displacement and clearance generation under repeated loading, ensuring long-term reliability without complicating the manufacturing process.
3Ease of operation
If uniform pressing force is applied to the connected surfaces, then the valve operation is straightforward, but displacement occurs due to insufficient bonding strength
Solution Approach 1:
The connected surfaces incorporate local unevenness with strategically positioned protrusions and recesses that create multiple contact points. This distribution of contact areas allows uniform pressing force to be effectively transferred through the connection interface, preventing displacement while maintaining straightforward valve operation.
Solution Approach 2:
The protrusion and recess features are pre-formed in the components before assembly through the insert molding process. This preliminary action creates built-in mechanical interlocking that automatically engages under pressing force, preventing displacement without requiring complex operational procedures.
Data Source
AI summary
A fluid control valve and manufacturing method thereof, wherein, when a pressing force acts on the engagement surface between a diaphragm member and a valve seat-contacting member, the valve seat-contacting member is not displaced and no gap is formed. The diaphragm member made of a first fluorine-based resin material is provided with a diaphragm membrane and a rod-shaped part in the center of the diaphragm membrane. The valve seat-contacting member made of an injection-moldable second fluorine-based resin material is provided with a ring-shaped sealing surface and a recess on the opposite side from the ring-shaped sealing surface. The rod-shaped part is partly fitted into the recess. A ring-shaped recessed is formed on outer circumference of a portion of the rod-shaped part. A small diameter recess is formed on the inner circumference of the recess. The ring-shaped recess section and the small diameter recess adhere closely to form the engagement surface.