Multilayer Corrugated Outer Jacket Against Water Ingress and Damage
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Solution Overview
Problem
Existing corrugated pipe outer jackets are prone to water penetration and damage, leading to costly repairs and potential system failure in thermally insulated pipe arrangements, particularly in local and district heating networks.
Innovation Solution
A three-layer corrugated pipe outer casing with a middle layer connected to both the inner and outer protective layers, featuring varying wall thicknesses and specific geometric designs to enhance flexibility and resistance to mechanical damage, combined with a thermally insulated pipe arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-walled flexible plastic corrugated pipe is used, then bending flexibility is maintained, but the pipe is easily damaged during storage, transport, or handling, allowing water penetration
Solution Approach 1:
The pipe outer casing is divided into three distinct layers: an inner layer, a middle connecting layer, and an outer protective layer. This segmentation allows each layer to perform specific functions - the inner layer provides baseline protection, the middle layer connects and seals, and the outer layer provides mechanical strength and damage resistance, collectively solving the contradiction between strength and complexity
Solution Approach 2:
The pipe outer casing uses a composite multi-layer structure combining different plastic materials with varying properties. The inner layer uses one plastic material, the middle layer uses another plastic material, and the outer layer uses a third plastic material optimized for mechanical strength. This composite approach enables the pipe to achieve high damage resistance while maintaining manageable structural complexity through functional differentiation
2Reliability
If a two-layer corrugated pipe outer jacket with a plastic liner is used, then damage resistance is improved, but water can still penetrate the interior when damage occurs, causing system failure
Solution Approach 1:
The protective structure is segmented into three functional layers: the inner layer provides the first line of defense, the middle connecting layer acts as a seal and structural bridge, and the outer layer provides mechanical protection. This segmentation ensures that even if one layer is compromised, the other layers maintain water penetration protection, achieving high reliability without excessive complexity
Solution Approach 2:
The multi-layer structure serves as a pre-prepared protective system that cushions against water penetration before damage occurs. The multiple layers are designed to work together to prevent water ingress under various damage scenarios, providing beforehand protection that maintains reliability while keeping the structure manageable
3Strength
If the wall thickness of the protective layer is increased in the region of corrugated pipe peaks, then damage resistance is improved, but bending flexibility is reduced
Solution Approach 1:
The protective layer exhibits local quality variation with different wall thicknesses at different locations. The wall thickness is greater in the region of corrugated pipe peaks where mechanical strength and damage resistance are most needed, and thinner in other regions where flexibility is more important. This local differentiation resolves the contradiction by optimizing strength where required without sacrificing overall bending flexibility
Solution Approach 2:
The wall thickness parameter of the protective layer is changed spatially to achieve optimal performance. By varying the wall thickness parameter along the circumference of the pipe - thicker at peaks, thinner elsewhere - the design achieves high damage resistance at critical locations while maintaining bending flexibility in less critical areas
Data Source
Figure 1~3
AI summary
The present invention relates to a multi-layer corrugated pipe outer casing (10) for accommodating at least one media pipe (100) for conducting a fluid, said pipe comprising an inner layer (20); a connecting layer (30) arranged on the inner layer (20) and connected to the inner layer (20) at least in sections; and a corrugated outer protective layer (40) arranged on the connecting layer (30) and having corrugated pipe peaks (41, 41') and corrugated pipe valleys (42, 42'), wherein the protective layer (40) is connected to the connecting layer (30) in the region of the corrugated pipe valleys (42, 42'). Furthermore, the present invention relates to a pipe arrangement (100) comprising a multi-layer corrugated pipe outer casing (10) according to the invention and at least one media pipe (50) accommodated therein for conducting a fluid.