Integrated Stress Cone and Metal Fitting for Cable Sealing
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Solution Overview
Problem
Existing cable sealing ends face challenges in achieving reliable oil-stopping seals due to complex structures, reliance on metal fittings or tapes, and potential electrical interference from semi-conducting materials, which complicates assembly and affects airtightness and physical properties.
Innovation Solution
A metal fitting integration type stress-relief cone is developed, integrating a rubber-like elastic body with a metal fitting and O-ring, featuring a cylindrical semi-conducting body, insulating body, and protective layers to prevent electrical interference and simplify assembly, while using an O-ring for sealing without additional metal fittings or tapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal fitting or tape is used for oil-stopping sealing, then sealing function is provided, but structure becomes complex and workability deteriorates
Solution Approach 1:
The patent combines the metal fitting and stress-relief cone into a single integrated component. The metal fitting includes a conical portion that forms the stress-relief cone, eliminating the need for separate sealing tapes or additional metal fittings. This integration reduces structural complexity while maintaining reliable oil-stopping sealing through the integrated metal components.
2Reliability
If metal fitting or tape is used for oil-stopping sealing, then sealing function is provided, but operation becomes more difficult
Solution Approach 1:
By integrating the stress-relief cone and metal fitting into one component, the patent eliminates the need for separate winding operations of sealing tapes. The integrated design allows for simpler installation procedures where the single component is positioned and secured, significantly improving workability while maintaining reliable sealing.
3Reliability
If semi-conducting body part contacts insulating oil, then stress-relief function is provided, but physical property of semi-conducting body part may be influenced
Solution Approach 1:
The patent extracts the semi-conducting body part from direct contact with insulating oil by providing a protective coating or isolation layer. The stress-relief cone maintains its stress-relief function through the metal fitting structure, while the semi-conducting portion is protected from oil exposure that could degrade its physical properties.
4Ease of operation
If predefined interfacial pressure is given to interface between stress-relief cone and epoxy unit, then position decision is easy, but pressure device with spring unit must be arranged
Solution Approach 1:
The patent integrates the pressure-application function into the metal fitting structure itself. The metal fitting is designed to naturally apply the required interfacial pressure through its mechanical structure and installation process, eliminating the need for separate spring units or complex pressure devices while maintaining easy position decision for the stress-relief cone.
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 enhances sealing reliability, reduces component complexity, prevents electrical interference, and simplifies assembly by integrating the stress-relief cone and metal fitting, improving the sealing characteristic and maintaining the physical properties of semi-conducting components.
Implementation Method 1
a stress-relief cone which is installed at an outer circumference of a cable core and consists of a rubber-like elastic body
Implementation Method 2
a stress-relief cone which is installed at an outer circumference of a cable core and consists of a rubber-like elastic body
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The reduction of the number of parts and the improvement of the sealing characteristic of the oil-stopping part are attempted. A metal fitting integration type stress-relief cone of this invention is provided with the stress-relief cone (2) which comprises a cylindrical rubber-like elastic body which is installed at an outer circumference of a cable core (11) and a metal fitting (3) which surrounds the cable core (11) and is provided integrally at a low-voltage side of the stress-relief cone (2). The stress-relief cone (2) is provided with a cylindrical semi-conducting body part (5) which is arranged at the low-voltage side and has a bell-mouthed electric-field stress-control part (51) in an end of a high-voltage side, a insulating body part (6) which is arranged at the high-voltage side and whose end of the low-voltage side is provided concentrically and continuously to the semi-conducting body part (5) at the electric-field stress-control part (51), and a cylindrical insulation protective layer (7) which is arranged continuously at the end of the low-voltage side of the insulating body part (6) and is provided integrally at the outer circumference of the semi-conducting body part (5).