Pipe Spigot End with Alternating Radial Sections
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Solution Overview
Problem
Existing pipe parts with chamfered spigot ends require high insertion force due to uniform deformation of sealing rings, making the insertion process tiresome and difficult to manage.
Innovation Solution
A pipe part with a spigot end featuring alternating radially inward sections and outward protuberances, which allow for non-uniform deformation of the sealing ring, providing tactile and audible feedback to facilitate easier insertion and reduce insertion force by exploiting different material properties and adapting to the annular shape of the socket end part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a cone-shaped external surface is used on the spigot end part, then the sealing ring is deformed uniformly during insertion, but the insertion force becomes undesirably great and the insertion process becomes tiresome
Solution Approach 1:
The cone-shaped external surface is segmented into multiple regions with alternating radial directions (inward and outward). This segmentation allows the sealing ring to be deformed in a non-uniform, sector-by-sector manner rather than uniformly throughout, reducing the peak insertion force required while maintaining effective sealing ring deformation for connection.
2Ease of operation
If the sealing ring is deformed uniformly round the entire circumference, then the spigot end part can be inserted into the socket end part, but the insertion force increases as insertion advances making the process difficult to manage
Solution Approach 1:
The alternating inward and outward radial regions create a periodic deformation pattern as the spigot end part is inserted. The sealing ring is deformed in alternating sectors rather than uniformly, creating a periodic action that reduces the continuously increasing insertion force characteristic of uniform deformation, making the insertion process more manageable.
3Force
If the sealing ring is deformed sector by sector, then the insertion force is reduced and applied in a distributed manner, but the design becomes more complex
Solution Approach 1:
The chamfered part is designed with local quality variations where different radial regions (inward and outward) serve different functions in the deformation process. This localized differentiation enables sector-by-sector deformation of the sealing ring while maintaining a relatively simple overall structure that can be manufactured using conventional processes.
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 non-uniform deformation and feedback mechanisms reduce the required insertion force, making the process more manageable and efficient, while allowing for improved design possibilities and manufacturing advantages.
Implementation Method 1
the sealing ring has to be uniformly deformed round the entire circumference. During this process the internal diameter of the sealing ring is increased, against elastic forces.
Implementation Method 2
The outer end structure is provided with at least one end-stage indicator for producing tactile and/or audible feedback to a person when insertion of the spigot end part into the socket has reached an end stage.
Implementation Method 3
The outer end structure is provided with at least one end-stage indicator for producing tactile and/or audible feedback to a person when insertion of the spigot end part into the socket has reached an end stage.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Pipe part (1) provided with a spigot end part (2) which is designed for insertion into a socket end part having on the inside a sealing ring, the spigot end part (2) having an outer end-structure (3) which comprises in circumferential direction in alternating fashion radially inwardly situated sections (4), and, relative to these inwardly situated sections, radially outwardly directed protuberances (5).