Resin Tube Fitting Geometry to Prevent Backwaters
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Solution Overview
Problem
Resin tube fittings cause backwaters in fluid flows due to the inner protrusion bulging into the fluid channel, leading to fluid stagnation and precipitation, which increases flushing time and can result in particle formation.
Innovation Solution
The inner protrusion is designed with a specific inner peripheral surface that reduces in diameter towards the axial direction, preventing deformation into the fluid channel and ensuring smooth fluid flow by maintaining a constant cross-sectional area, and the insert's slope and inner peripheral surfaces are shaped to prevent bulging when the union nut is engaged, allowing fluid to flow unobstructed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner protrusion is pressed into the groove to form a sealing area, then sealing performance is improved, but the inner protrusion bulges into the fluid channel causing backwaters
Solution Approach 1:
The inner protrusion is designed with different local properties: the outer peripheral surface maintains high elasticity for effective sealing against the groove, while the inner peripheral surface has reduced elasticity or a tapered geometry to prevent bulging into the fluid channel. This local differentiation allows the same component to achieve both sealing performance and smooth fluid flow without backwaters.
2Reliability
If the inner protrusion is made more elastic to improve sealing, then sealing force increases, but deformation into the fluid channel worsens
Solution Approach 1:
Different regions of the inner protrusion have different elastic properties. The outer peripheral surface is made with higher elasticity to ensure strong sealing force against the groove, while the inner peripheral surface uses material with reduced elasticity or is designed with a tapered shape to minimize deformation into the fluid channel during assembly and operation.
Solution Approach 2:
The inner protrusion is functionally segmented into two distinct zones: an outer sealing zone with high elasticity for contact with the groove, and an inner flow zone with reduced elasticity or tapered geometry to maintain fluid channel integrity. This segmentation allows independent optimization of sealing performance and flow characteristics.
Data Source
AI summary
A resin tube fitting prevents backwaters between its body and inner ring. The fitting includes a body, an inner ring, and a union nut. The body has main, outer, and inner sleeves, and a groove. The inner ring has a cylinder, an insert, and outer and inner protrusions. The union nut has a body and a pressing member. The inner sleeve has a through hole serving as a channel. The inner protrusion extends from the cylinder to an axial direction to contact the inner sleeve. The inner protrusion has a through hole serving as another channel connected with the inner sleeve's channel. The tip of the inner protrusion has an inner diameter not less than the minimum inner diameter of the inner sleeve. An inner peripheral surface is located at the inner periphery of the inner protrusion and causes it to reduce in inner diameter toward another axial direction.