Metallic Pipe Connection Geometry for Uniform O-Ring Compression
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Solution Overview
Problem
Existing metallic pipe connections face issues with non-uniform compression of O-rings, residual stresses, and limited tool versatility, leading to leakage and structural weaknesses, particularly when using tools not specific to the geometry of the connection.
Innovation Solution
A metallic pipe connection design featuring a tubular body with an annular seat and inclined inner walls for uniform O-ring compression, allowing use with various tools and materials, and a 'V'-shaped profile to reduce stress concentrations and facilitate deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific pliers deformation tool is designed for each geometry, then the watertight connection is achieved, but the device complexity and tool versatility are reduced
Solution Approach 1:
The patent designs a universal pliers deformation tool with a standardized jaw geometry that can accommodate multiple fitting geometries. The tool applies deformation forces through fixed jaws that work effectively across different annular profile shapes, eliminating the need for geometry-specific tools while maintaining reliable watertight connections.
Solution Approach 2:
The patent modifies the deformation mechanism by changing from geometry-specific jaw shapes to a standardized jaw design that relies on controlled plastic deformation parameters. The tool achieves effective deformation by optimizing the application of force through the standardized jaws, adapting to different geometries through parameter control rather than geometric matching.
2Device complexity
If a universal tool is designed for different geometries, then the device complexity is reduced, but the manufacturing precision and uniform O-ring compression are compromised
Solution Approach 1:
The patent applies local quality by designing the standardized jaws with specific surface characteristics and deformation zones that adapt to local geometry variations. The jaws incorporate features such as textured surfaces or localized deformation zones that ensure uniform O-ring compression regardless of the overall fitting geometry, maintaining manufacturing precision through localized adaptations.
3Reliability
If plastic deformation is applied by pressing tools, then the watertight connection is achieved, but residual stresses are generated that weaken the structure
Solution Approach 1:
The patent incorporates preliminary action by designing the fitting geometry and deformation sequence to prepare the material for controlled plastic deformation. The annular profile and jaw configuration are designed in advance to distribute deformation forces evenly, preventing excessive residual stresses while achieving the necessary watertight connection. The deformation process is pre-planned through geometric design to minimize structural weakening.
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 design ensures uniform and controlled deformation of O-rings, reducing leakage risks and structural weaknesses, enabling compatibility with different tools and materials, and improving manufacturing efficiency.
Implementation Method 1
at least part of the tubular engagement portion and the annular seat are configured to be plastically deformed such to generate a mechanical seal on the pipe on which the tubular engagement portion is fitted and a contemporaneous fluid tightness between the connection and said pipe
Data Source
AI summary
A metallic pipe connection may comprise a tubular body and a terminal tubular engagement portion configured to be engaged on a pipe and to be fixed thereto by means of plastic deformation of the engagement portion, and a terminal flange on the opposite side of the tubular body with respect to that one provided with the tubular engagement portion. The tubular engagement portion may include an annular seat for a sealing gasket, having a first housing groove for the sealing gasket which may be internally open towards the tubular engagement portion, and at least part of the tubular engagement portion and the annular seat may be plastically deformed such to generate a mechanical seal on the pipe on which the tubular engagement portion is fitted.