Fitting With Knurled Inner Surface For Interference Pipe Joint
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Solution Overview
Problem
Current methods for joining components, such as copper tubing, are often expensive and lack an efficient sealing mechanism, necessitating an improved system for fixed and sealingly coupling components.
Innovation Solution
The proposed solution involves an assembly comprising a fitting with an annular body, a structure, and a seal element, utilizing a press fit or interference fit with gripping features like knurls and a grip ring to securely engage and seal the components, potentially eliminating the need for additional fastening methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional joining systems with multiple rings (sealing ring, cutting ring, T-shaped separating ring) are used, then sealing and connection are achieved, but the system becomes expensive and complex
Solution Approach 1:
The patent combines multiple functions (sealing, gripping, and structural support) into a single integrated fitting design. The annular body incorporates both the sealing surface and the gripping features directly on its inner diametrical surface, eliminating the need for separate sealing rings and gripping rings, thus reducing component count while maintaining sealing reliability
Solution Approach 2:
The inner diametrical surface of the annular body serves multiple functions simultaneously: it provides the sealing surface for the seal element, incorporates gripping features for structural engagement, and maintains the press fit or interference fit. This multi-functional design reduces the number of specialized components needed
2Reliability
If traditional joining systems with multiple rings are used, then connection is achieved, but the cost increases
Solution Approach 1:
By merging the sealing ring, cutting ring, and separating ring functions into a single annular body design with integrated features, the patent reduces the number of parts that need to be manufactured, inventoried, and assembled. This integration directly reduces manufacturing costs while maintaining connection reliability through the press fit and interference fit mechanisms
Solution Approach 2:
The patent employs a simple seal element (such as an O-ring) that can be easily manufactured and replaced if needed, rather than complex multi-ring systems. The seal element is a cost-effective solution that provides reliable sealing without requiring expensive specialized components
3Strength
If press fit or interference fit with gripping features is used, then secure engagement is achieved, but the sealing mechanism complexity increases
Solution Approach 1:
The patent combines the gripping features and sealing surface into the same annular body structure. The gripping features (knurls, ridges, or other surface variations) are formed directly on the inner diametrical surface that also serves as the sealing surface, integrating structural engagement and sealing functions in a single simple mechanism
Solution Approach 2:
The gripping features are applied locally on specific portions of the inner diametrical surface rather than requiring a complete complex mechanism. The knurls, ridges, or surface variations are concentrated in specific areas to provide adequate engagement strength without complicating the overall sealing mechanism
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
This configuration provides a cost-effective and reliable method for forming a secure, fluid-tight joint between components, reducing the likelihood of leaks and eliminating the need for expensive fastening materials or methods.
Implementation Method 1
The seal element may be disposed within the fitting and sealingly engaged to the structure and the fitting body
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 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 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.