Composite Pipe Coupling With Stepped Jackets for High Pressure
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Solution Overview
Problem
Existing connections between composite pipes and coupling pieces lack sufficient pressure resistance for high-pressure applications such as geothermal probes, water, gas, or heating lines.
Innovation Solution
A composite pipe with a multi-layered pipe wall featuring a stepped structure in the connection area, where the outer and inner plastic jackets extend differently in the axial longitudinal direction, forming large surfaces for cohesive connection with the coupling piece, which can be made of similar materials for fusion or other integral connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the composite pipe uses a multi-layered pipe wall with reinforcement between inner and outer plastic jackets, then the pressure resistance of the pipe is improved, but the connection strength to the coupling piece is insufficient
Solution Approach 1:
The pipe wall is segmented into multiple layers (inner plastic jacket, reinforcement, outer plastic jacket) with each layer extending to different lengths in the axial direction. This segmentation allows each layer to contribute differently to the connection, with the inner and outer jackets providing separate bonding surfaces to the coupling piece, thereby enhancing overall connection strength while maintaining pressure resistance.
Solution Approach 2:
The invention extends the solution from a single-plane connection to a multi-dimensional stepped structure. The inner and outer plastic jackets extend axially to different extents, creating multiple bonding surfaces at different positions along the axial direction. This dimensional extension provides larger total bonding area and better stress distribution, resolving the contradiction between pressure resistance and connection strength.
2Ease of manufacture
If the outer and inner plastic jackets extend to the same extent into the coupling piece, then the manufacturing is simplified, but the connection pressure resistance is insufficient for high-pressure applications
Solution Approach 1:
The inner and outer plastic jackets are designed with asymmetric axial extensions, where the inner jacket extends to a different length than the outer jacket. This asymmetry creates a stepped structure that provides multiple bonding surfaces at different axial positions, enhancing connection reliability for high-pressure applications while remaining manufacturable through standard extrusion and bonding processes.
Solution Approach 2:
Different regions of the pipe wall are given different functional qualities. The inner plastic jacket and outer plastic jacket are designed with different axial extension lengths, allowing each region to optimize its contribution to the connection. This local differentiation of quality enables the structure to achieve high connection reliability without compromising manufacturability.
3Strength
If a stepped structure is formed with inner and outer plastic jackets extending to different extents, then the connection pressure resistance is improved, but the device complexity increases
Solution Approach 1:
The stepped structure is achieved by integrating the different extension lengths of the inner and outer plastic jackets directly into the pipe wall construction. Rather than adding separate components or complex assembly steps, the solution merges the functional requirements into the basic pipe structure itself, where the reinforcement layer naturally provides the stepped configuration through differential extension of the plastic jackets.
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 achieves high-pressure-resistant connections exceeding 16 bar, maintaining consistent opening cross-sections and enabling seamless integration without narrowing, suitable for various high-pressure applications.
Implementation Method 1
the outer plastic jacket and the inner plastic jacket in the connection area are each materially connected to the coupling piece, in particular fused
Data Source
Figure 1~2
Figure 3
AI summary
Arrangement with at least one composite pipe (1) and at least one coupling piece (3) connected to the composite pipe (1) in a connection area (2), the composite pipe (1) having a multi-layered pipe wall (4) with at least one outer plastic jacket (5) and at least one inner plastic jacket (6) and at least one reinforcement (7) arranged between the outer plastic jacket (5) and the inner plastic jacket (6) and the outer plastic jacket (5) and the inner plastic jacket (6) in the connection area (2) are each materially connected to the coupling piece (3), in particular fused, with the outer plastic jacket (5) and the inner plastic jacket (6) extending into the coupling piece (3) at different distances in an axial longitudinal direction (8) of the composite pipe (1). extend in, wherein the outer plastic jacket (5) and the inner plastic jacket (6) in the connection area (2), in a longitudinal section along the axial Längsric Hung (8) of the composite pipe (1) seen together form a stepped structure (9) of the pipe wall (4). (Fig.1)