Clamping Saddle Groove Perpendicular Inner Cheek
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Solution Overview
Problem
Existing saddle designs with sealing grooves for plastic pipes suffer from inadequate tightness under increased internal pressures and risk of seal displacement or flushing due to non-constant pressure conditions and acute angles, which are difficult to produce using injection molding.
Innovation Solution
A saddle with a groove design where the inner cheek is perpendicular to the saddle piece's inner surface and the outer cheek is not parallel to the inner cheek at any point, ensuring constant cross-sectional area and pressure conditions, allowing for even seal expansion and reducing the risk of seal displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the groove cross-sectional area and contour are allowed to change along the curvature in the saddle, then the saddle can be easily produced by injection molding, but the seal is flushed out laterally at the extreme points and cannot adapt to its geometrically optimal needs
Solution Approach 1:
The groove cross-sectional area and contour are maintained constant along the entire groove course, rather than changing with the saddle curvature. This parameter change ensures uniform pressure distribution on the seal and prevents lateral flushing, while the groove is positioned and oriented to achieve this constant cross-section compatible with injection molding production
Solution Approach 2:
The groove is designed to provide equipotential conditions for the seal along its entire course, meaning the seal experiences uniform pressure and geometric conditions at all positions. This is achieved by carefully designing the groove's cross-sectional dimensions and orientation relative to the saddle curvature, ensuring the seal can expand uniformly without being squeezed or flushed out
2Reliability
If the inner cheek of the groove is arranged perpendicular to the inner surface of the saddle piece over the entire course, then constant pressure conditions are achieved on the seal, but the groove design becomes difficult to produce by injection molding due to undercut formation
Solution Approach 1:
The orientation of the groove cheeks is optimized to achieve constant cross-sectional area along the groove course. The inner cheek is arranged perpendicular to the inner surface of the saddle piece, while the outer cheek is oriented to maintain constant cross-section. This parameter configuration ensures uniform seal pressure and prevents undercut formation that would hinder injection molding production
Solution Approach 2:
Different sections of the groove have specifically optimized orientations: the inner cheek is perpendicular to the saddle inner surface over the entire course, while the outer cheek is positioned to achieve constant cross-section. This local quality differentiation ensures both seal reliability and manufacturability by injection molding
Data Source
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AI summary
Saddle, in particular clamping saddle for plastic pipes, comprising a branch extension, a saddle piece, central axes (X) (Y) and (Z) and a groove for arranging a seal, wherein the inner side of the groove is arranged perpendicular to the inner surface of the saddle piece over the entire length of the groove.