Composite Transition Fitting With Anti-Rotation Leak Resistance
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Solution Overview
Problem
Transition fittings that incorporate metallic components, such as brass, are expensive and can leach lead into fluids, while those made entirely from polymeric materials face limitations in dimension and increased risk of leaking due to thermal expansion differences between materials.
Innovation Solution
A composite pipe fitting design featuring a first body with anti-rotation grooves and a second body with corresponding anti-rotation fingers, allowing for a secure connection and overmolding to create a fluid-tight seal, using polymeric materials that differ in composition to attach to both metallic and polymeric pipes without incorporating metallic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic components (brass) are used in transition fittings, then connection strength and durability are improved, but manufacturing cost increases and lead leaching risk occurs
Solution Approach 1:
The patent removes metallic components from the transition fitting, extracting only the essential function of connecting different pipe materials. The fitting is made entirely from polymeric materials, eliminating lead leaching risks and manufacturing costs associated with brass while maintaining connection functionality through molded-in-place secondary bodies and anti-rotation features.
Solution Approach 2:
The patent uses composite polymeric materials to replace metallic components. A secondary polymeric body is molded into the main polymeric body, creating a composite structure that provides the necessary mechanical strength and connection properties without using metals. This composite approach allows the fitting to withstand rotational forces and maintain connection integrity.
2Reliability
If metallic components are used in transition fittings, then connection reliability is improved, but health safety deteriorates due to lead leaching
Solution Approach 1:
The patent completely extracts metallic components from the fitting design, eliminating the source of lead leaching. The secondary body that provides connection reliability is made from polymeric material molded into the main body, removing any health hazards associated with metal leaching while maintaining the mechanical reliability needed for secure connections.
3Adaptability or versatility
If dissimilar metallic and polymeric materials are combined, then transition functionality is achieved, but leakage risk increases due to thermal expansion differences
Solution Approach 1:
The patent applies homogeneity by making both the main body and secondary body from polymeric materials, eliminating the dissimilar material interface that causes thermal expansion mismatches. This homogeneous polymeric construction prevents leakage issues arising from differential thermal expansion between metals and polymers while maintaining the ability to connect different pipe types.
4Reliability
If the secondary body is molded into the main body, then connection security is improved, but dimensional flexibility deteriorates
Solution Approach 1:
The patent segments the anti-rotation feature into distinct components: anti-rotation grooves in the main body and corresponding anti-rotation fingers on the secondary body. This segmentation allows the secondary body to be molded into the main body for secure connection while maintaining dimensional flexibility, as the grooves and fingers can be designed in various configurations to accommodate different size and shape requirements.
Data Source
AI summary
A pipe fitting having a first body and a second body that together at least partially define a fluid flow passage. The first body defines a first portion of the fluid flow passage that extends from a first end of the fluid flow passage to a first internal opening. The second body defines a second portion of the fluid flow passage that extends from a second internal opening to a second end of the fluid flow passage. The first body has a first interface surface that surrounds the first internal opening, the first interface surface having a plurality of anti-rotation grooves. The second body has a second interface surface that surrounds the second internal opening and engages with the first interface surface. The first internal opening is in fluid communication with the second internal opening. The second interface surface has a plurality of anti-rotation fingers that are each received by and engage with a corresponding one of the anti-rotation grooves. Rotation of the second body relative to the first body is resisted by the engagement of the anti-rotation fingers with the anti-rotation grooves.