Insulated Composite Pipe Structure for Balanced Pressure Reinforcement
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Solution Overview
Problem
Pipes used in district heating systems, particularly those made of cross-linked polyethylene (PEX), face challenges with high temperature resistance, diffusion of elements and water vapor, and uneven reinforcement under varying pressures, leading to potential corrosion and reduced durability.
Innovation Solution
A pipe design featuring an innermost polymeric tube, a fluid diffusion barrier layer, a reinforcing layer with meshed fibers bonded by adhesive layers, and an outermost polymeric shell, where the meshed fibers are fixed to ensure equal axial and radial reinforcement and resistance to temperature changes, using additional longitudinal fibers to balance force components and prevent fiber movement that could damage adjacent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PEX pipes are used for easy installation and flexibility, then installation ease is improved, but temperature resistance deteriorates causing pipe wall softening and pressure resistance loss
Solution Approach 1:
The patent uses a composite structure combining PEX material with glass fiber reinforcement and adhesive layers. The glass fiber mesh provides temperature and pressure resistance while the PEX maintains flexibility and installation ease. The adhesive layers bond these materials together to create a unified composite pipe structure that exhibits both properties simultaneously.
2Strength
If pipe wall thickness is increased to improve pressure resistance, then strength is improved, but material consumption increases
Solution Approach 1:
The patent employs a composite structure with a PEX base material reinforced by glass fiber mesh embedded in adhesive layers. This composite construction provides enhanced pressure resistance without requiring a proportional increase in overall pipe wall thickness, as the glass fiber reinforcement contributes significantly to strength while having minimal impact on material consumption compared to a solid thicker PEX wall.
Solution Approach 2:
The glass fiber reinforcement is strategically placed in the adhesive layers at specific positions within the pipe wall structure where mechanical strength is most needed. This localized reinforcement approach provides pressure resistance exactly where required without unnecessarily increasing material consumption throughout the entire pipe wall.
3Force
If meshed fibers are arranged at equilibrium angle for balanced radial and axial reinforcement, then force distribution is improved, but adaptability to varying pressures and pipe sizes deteriorates
Solution Approach 1:
The patent uses a meshed glass fiber reinforcement structure where the fibers are arranged in multiple directions including axial, circumferential, and diagonal orientations. This dynamic multi-directional arrangement allows the reinforcement to adapt to varying pressure conditions and pipe sizes, as the load is distributed across fibers oriented at different angles rather than being constrained to a single equilibrium angle.
Solution Approach 2:
The combination of PEX material with multi-directionally arranged glass fiber mesh creates a composite structure that can accommodate varying operational parameters. The glass fiber reinforcement provides structural integrity across different pressure and temperature conditions while the PEX matrix allows for flexibility in pipe sizing and installation configurations.
4Adaptability or versatility
If fibers are allowed to move to withstand temperature and mechanical load changes, then adaptability is improved, but fiber movement damages adjacent layers
Solution Approach 1:
The patent introduces adhesive layers as intermediary materials between the PEX pipe wall and the glass fiber reinforcement. These adhesive layers serve as a bonding medium that secures the glass fiber mesh in place, preventing fiber movement that would damage adjacent layers. Simultaneously, the adhesive layers allow for controlled thermal expansion and contraction, maintaining the integrity of the composite structure under temperature and mechanical load changes.
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 design enhances the pipe's durability and resistance to pressure changes, maintaining equilibrium between radial and axial forces, reducing material consumption, and preventing damage from fiber movement, resulting in a more reliable and stable pipe structure.
Implementation Method 1
The meshed fibers are bonded with each other and with adjacent layers by means of adhesive layers
Implementation Method 2
a fluid diffusion barrier layer surrounding the polymeric tube
Data Source
AI summary
The invention relates to a pipe (P) for transporting a fluid (8), comprising an innermost polymeric tube (1) for transporting the fluid (8), a fluid diffusion barrier layer (3) surrounding the polymeric tube (1), wherein the fluid diffusion barrier layer (3) is bonded with the polymeric tube (1) by means of a first adhesive layer (2), a reinforcing layer (5) surrounding the fluid diffusion barrier layer (3). The reinforcing layer (5) comprises meshed fibers (N) and is bonded with the fluid diffusion barrier layer (3) by means of a second adhesive layer (4). The pipe further comprises an outermost polymeric shell (7) surrounding the reinforcing layer (5), which is bonded with the reinforcing layer (5) by means of a third adhesive layer (6).