Weldable Half-Shell Fitting for Double Pipe Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing double pipe systems require complex and costly connection processes, involving multiple simultaneous connections that are difficult to inspect and repair, leading to inefficiencies and potential leaks.
Innovation Solution
A fitting design featuring two plastic half-shells with integrated heating wires and snap connection elements, allowing for easy assembly and inspection of connections between primary and secondary pipelines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If simultaneous or cascade welding is used to join inner and outer pipes to fittings, then connection strength is improved, but the complexity of the connection process and difficulty of inspection increase
Solution Approach 1:
The fitting is divided into two separate half-shells that can be assembled around the pipe after welding. This segmentation allows the welding process to be simplified to single-pipe connections rather than simultaneous multi-pipe connections, while still achieving the required connection strength through the half-shell assembly structure.
Solution Approach 2:
The inner pipe is welded to the fitting first, and the fitting is inspected before the outer pipe is installed. This preliminary action allows inspection of critical welds before the secondary containment is added, simplifying the overall process while ensuring connection integrity.
2Ease of operation
If adhesive bonding is used to join pipes to fittings, then ease of operation is improved, but connection strength and reliability deteriorate
Solution Approach 1:
The connection process is segmented into two independent steps: first welding the inner pipe to the fitting, then separately installing the outer pipe. This eliminates the need for complex simultaneous adhesive bonding of multiple surfaces while maintaining strong mechanical connections through welding.
3Reliability
If multiple simultaneous connections are required for installation, then complete sealing is improved, but installation time and complexity increase
Solution Approach 1:
The sealing system is segmented into an inner sealed connection (inner pipe to fitting) and an outer containment shell. The inner connection can be completed and inspected first, then the outer shell is installed to provide additional containment, allowing sequential rather than simultaneous operations.
Solution Approach 2:
The inner pipe connection and sealing are completed as a preliminary action before installing the outer containment shell. This allows the critical sealing function to be established first, then reinforced by the outer shell without requiring simultaneous operation.
4Manufacturing precision
If the fitting is designed as a complete closed structure, then manufacturing precision is improved, but ease of inspection and repair deteriorates
Solution Approach 1:
The fitting is segmented into two half-shells that can be separated from each other. This allows the fitting to maintain its precise manufactured form when assembled, while enabling easy disassembly for inspection and repair by separating the half-shells to access internal connections.
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 fitting enables efficient and cost-effective installation of secondary pipelines by simplifying the connection process, allowing for pre-installation checks of primary pipeline welds, and facilitating easier identification and repair of any leaks.
Implementation Method 1
Each half-shell has an integrated heating wire, the heating wire being arranged in the areas of the connection spigots and having several meandering turns
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Fitting for connecting a secondary plastic pipeline of a double pipe system comprising two plastic half-shells, each half-shell having an integrated heating wire, the heating wire being arranged in the areas of the connection spigots and having several meandering turns, the heating wire being arranged in a groove provided for this purpose in the half-shell and connecting elements connecting the two half-shells, characterized in that the fitting has spacer elements arranged on the inner circumference of the half-shells for the concentric arrangement of the fitting relative to a primary pipeline.