Layered Vertical Cable Reinforcement for Strength and Fluid Sealing
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Solution Overview
Problem
Existing electrical cables for vertical applications, such as shaft mining and oil or gas wells, face challenges of high weight, limited yield strength, and susceptibility to fluid and corrosive damage, leading to short operational lifespans.
Innovation Solution
The development of an electrical cable with a core, a sheath, and a reinforcing jacket made of concentric layers, where at least the first layer is a circumferentially closed metal tube, providing both mechanical strength and fluid imperviousness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional electrical cables are used for vertical applications, then they provide basic electrical conduction, but they exhibit high weight, limited yield strength, and susceptibility to fluid and corrosive damage
Solution Approach 1:
The cable is divided into distinct functional layers: a core for electrical conduction, a sheath for basic protection, and a reinforcing jacket with concentric layers (including metal tube layer, strength layer, and outer protection layer) for mechanical strength. This segmentation allows each layer to be optimized independently, achieving high yield strength without excessive weight.
Solution Approach 2:
The cable employs composite material construction with multiple materials serving different functions: the metal tube layer provides corrosion resistance and fluid imperviousness, the strength layer (with helically wound wires) provides tensile strength, and the outer protection layer provides environmental resistance. This composite approach achieves high strength-to-weight ratio.
2Reliability
If traditional electrical cables are used for vertical applications, then they provide basic electrical conduction, but they exhibit high weight, limited yield strength, and susceptibility to fluid and corrosive damage
Solution Approach 1:
The cable structure incorporates preliminary protective measures: the metal tube layer is positioned to provide hermetic sealing against fluid penetration before corrosive agents can reach internal components. The corrosion-resistant metal alloy and protective coatings are applied in advance to prevent deterioration during operation, extending operational lifespan to 2-10 years in aggressive environments.
Solution Approach 2:
Multiple protective layers with different material properties are combined: the metal tube layer provides fluid imperviousness, corrosion-resistant metal alloys resist chemical attack, and protective coatings provide additional environmental resistance. This multi-material composite structure comprehensively addresses fluid and corrosive damage.
3Reliability
If traditional electrical cables are used for vertical applications, then they provide basic electrical conduction, but they lack hermetic sealing against fluid penetration
Solution Approach 1:
The cable is segmented into functional layers with the metal tube layer specifically dedicated to hermetic sealing. This dedicated sealing layer provides reliable fluid penetration protection without requiring complex multi-component sealing systems, balancing reliability with manageable complexity.
Solution Approach 2:
The metal tube layer acts as a flexible hermetic barrier that maintains sealing effectiveness while accommodating cable movement and deformation. This thin-walled metal tube provides hermetic sealing without adding excessive complexity to the overall cable structure.
Data Source
Figure 1~2.3
Figure 3~4.3
Figure 5~6.3
AI summary
Disclosed is an electrical cable for vertical applications, comprising a core having a length L, a sheath surrounding the core and extending through the whole length L and a reinforcing jacket surrounding the sheath and in direct contact therewith. The reinforcing jacket is made of concentric layers comprising a first layer longitudinally extending from a first cable end (the proximal or upper cable end, in use) towards a second cable end (the distal or lower cable end, in use) substantially along the whole length L. The reinforcing jacket also comprises at least one further layer longitudinally extending from the first cable end towards the second cable end for a length shorter than L. At least one layer of the reinforcing jacket is a circumferentially closed metal tube. Also disclosed is a process for manufacturing such cable.