Retaining Catch Bending Portion Absorbs Pipe Forces
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Solution Overview
Problem
Existing socket pipe connections face issues with retaining catches breaking due to severe bending forces caused by manufacturing fluctuations in pipes, particularly in ductile cast iron pipes used in high-pressure water and waste water systems, leading to potential failure under tensile forces.
Innovation Solution
The retaining catch features a bending portion with a reduced cross-section, allowing it to bend like a film hinge and absorb bending forces, and is made from pressure-resistant plastic materials like glass fiber-reinforced plastics, which are more cost-effective and less prone to creep, with a projection for proper alignment and a continuous arcuate transition for increased strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If retaining catches are made from rigid materials to withstand high tensile forces, then strength is improved, but susceptibility to breakage under bending forces increases
Solution Approach 1:
The retaining catch is segmented into two distinct portions: a rigid catch body for withstanding tensile forces and a flexible bending portion for absorbing bending forces. This segmentation allows each portion to be optimized for its specific function, preventing breakage while maintaining strength.
Solution Approach 2:
Different portions of the retaining catch have different mechanical properties: the catch body is made rigid for strength, while the bending portion is made flexible for shock absorption. This local differentiation of material properties resolves the contradiction between needing rigidity for strength and flexibility for reliability.
2Strength
If retaining catches are designed with uniform cross-section for strength, then load-bearing capacity is improved, but adaptability to manufacturing tolerances worsens
Solution Approach 1:
The bending portion is designed to be dynamically flexible, allowing it to deform and adapt to manufacturing tolerances and misalignments. This dynamic flexibility compensates for variations in pipe dimensions while the rigid catch body maintains load-bearing capacity.
Solution Approach 2:
The cross-sectional parameters of the retaining catch are changed along its length: the catch body has a larger cross-section for strength, while the bending portion has a reduced cross-section for flexibility. This parameter variation allows the structure to adapt to manufacturing tolerances while maintaining strength where needed.
3Strength
If retaining catches use metal materials for strength, then mechanical strength is improved, but electrical conductivity increases causing unwanted creeping currents
Solution Approach 1:
The retaining catch uses a non-metallic plastic material that is sufficient for the application's mechanical strength requirements. This disposable-like approach (using adequate rather than maximum material properties) eliminates the harmful electrical conductivity while providing sufficient strength for the retaining function.
Solution Approach 2:
The retaining catch is made from a composite plastic material that provides sufficient mechanical strength without the electrical conductivity of metals. This material selection resolves the contradiction by eliminating the harmful electrical property while maintaining the necessary mechanical properties.
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 design enhances the robustness of retaining catches, preventing breakage under manufacturing tolerances and high pressures, ensuring secure connections in pipe systems while maintaining electrical insulation and reducing material costs.
Implementation Method 1
the catch body along the bending portion has a reduction cross-section which is reduced in size—viewed in the radial direction—in relation to the catch cross-section
Data Source
AI summary
A retaining catch for a socket pipe connection has a substantially circle-arc-shaped catch body, on which is arranged a protrusion which projects from the catch body. The catch body has a catch cross section in a cross-sectional plane as seen radially in a direction transverse to its circle-arc shaped longitudinal extent. The catch body has a bending portion, and the catch body, along the bending portion, has a reduction cross section which is reduced in size—as seen radially—in relation to the catch cross section.