Grip Ring Fitting for Copper Tubing Sealing
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Solution Overview
Problem
Existing fluid conduit systems, particularly those using copper tubing for potable water transmission, require an improved joining method that is cost-effective and provides a secure, sealing connection without the high expense of existing solutions.
Innovation Solution
A fitting assembly comprising an annular body with an insertion end and inner diametrical surface featuring gripping features, combined with a seal element and grip ring, utilizing a press fit or interference fit for secure engagement, which can be crimped for permanent coupling, reducing the need for additional fastening means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a press-fit or interference-fit system with seal element is used, then the joining cost is reduced and assembly is simplified, but the connection strength and sealing reliability may be insufficient
Solution Approach 1:
The patent combines multiple functions into a single integrated grip ring structure that provides both mechanical gripping force and sealing action. The grip ring integrates the gripping features (teeth or ridges) and the seal element into one component that engages with both the fitting and the conduit, eliminating the need for separate fastening and sealing components while maintaining both connection strength and sealing reliability.
Solution Approach 2:
The grip ring is formed from composite material or multi-layer construction that combines rigid gripping surfaces with flexible sealing surfaces. This allows the same component to provide both the mechanical interference fit for strong connection and the compliant seal for leak-proof performance, resolving the contradiction between connection strength and sealing reliability while keeping the system cost-effective.
2Device complexity
If a simple press-fit system is used, then the assembly process is simplified, but additional fastening means may be required to ensure permanent coupling
Solution Approach 1:
The grip ring is designed to self-grip and self-lock within the fitting body through its circumferential gripping features. When the conduit is inserted, the grip ring automatically engages with both the fitting and the conduit outer surface, creating a permanent mechanical coupling without requiring external fastening operations. The resilient nature of the grip ring allows it to self-adjust and maintain constant gripping force.
3Reliability
If multiple separate components (sealing ring, cutting ring, T-shaped separating ring) are used, then the sealing and spacing functions are achieved, but the system becomes expensive and complex
Solution Approach 1:
The patent consolidates multiple separate components (sealing ring, cutting ring, and T-shaped separating ring) into a single integrated grip ring structure. This grip ring simultaneously performs the sealing function, the spacing function, and the gripping function that were previously distributed across multiple components. The integration maintains all necessary functions while reducing component count, simplifying assembly, and lowering cost.
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 provides a cost-effective, secure, and leak-proof connection for fluid conduits, suitable for various applications, including copper tubing systems, by using a combination of a grip ring and seal element within the fitting assembly, ensuring reliable fluid transmission without the need for expensive materials or complex assembly processes.
Implementation Method 1
a seal element (22) disposed within the fitting (14) and sealingly engaged to the structure (12) and the fitting body (20)
Implementation Method 2
The engagement between the inner diametrical surface of the fitting and the outer diametrical surface of the structure may include a press fit and/or an interference fit
Implementation Method 3
The engagement between the inner diametrical surface of the fitting and the outer diametrical surface of the structure may include a press fit and/or an interference fit
Data Source
AI summary
An assembly may include a fitting, a first pipe, and a first seal. The fitting may include an annular body having a first insertion end and an inner diametrical surface having a first knurled portion (432) disposed adjacent the first insertion end. The first pipe may include a first end portion that is received into the first insertion end of the body and an outer diametrical surface (418) including knurls formed thereon. The knurls of the outer diametrical surface may engage the first knurled portion of the fitting. The first seal element may be disposed within the fitting and may sealingly engage the first pipe and the fitting body. The engagement between the inner diametrical surface of the fitting and the outer diametrical surface of the pipe may a press fit and/or an interference fit.