Armored Cable Fitting Multi-Layer Sealing Mechanism
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Solution Overview
Problem
Existing armored cable fittings fail to provide reliable, multi-layered sealing mechanisms to maintain a fluid-tight seal in hazardous environments, particularly in applications requiring protection against liquids and gases.
Innovation Solution
A fitting comprising an adaptor, body, and nut with multiple sealing mechanisms: a metal-to-metal seal between the conical sealing surface and rounded body surface, a compression seal using an elastomeric internal seal, and a jacket seal, ensuring a fluid-tight seal around the armored cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing armored cable fittings are used, then the structure is simple, but they fail to provide reliable multi-layered sealing mechanisms to maintain fluid-tight seal in hazardous environments
Solution Approach 1:
The fitting is divided into multiple functional components: a body portion, a sealing member with elastomeric material, a metal-to-metal seal mechanism, and a cable access channel. Each segment performs a specific sealing function, creating multi-layered protection against fluid ingress while maintaining manageable structural complexity
Solution Approach 2:
The sealing system combines multiple materials with different properties: elastomeric material for flexible sealing, metal components for structural integrity and metal-to-metal sealing, and complementary material for additional sealing layers. This composite approach ensures reliable fluid-tight sealing in hazardous environments
2Object-affected harmful factors
If existing armored cable fittings are used, then the manufacturing process is simple, but they cannot protect against fluid ingress in hazardous locations
Solution Approach 1:
The sealing member is pre-formed with elastomeric material and metal-to-metal seal features integrated into the fitting structure before final assembly. The cable access channel is pre-configured with appropriate sealing surfaces, allowing fluid-tight sealing to be achieved through straightforward assembly without complex manufacturing steps
Solution Approach 2:
The elastomeric material acts as an intermediary between the rigid metal components and the armored cable, accommodating dimensional variations and assembly tolerances while ensuring fluid-tight sealing. This intermediary element simplifies manufacturing by providing a forgiving sealing interface
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 fitting achieves a reliable, multi-layered sealing system that maintains a fluid-tight seal, protecting the armored cable from environmental factors and ensuring reliable performance in hazardous locations.
Implementation Method 1
a compression seal using an elastomeric internal seal
Implementation Method 2
a metal-to-metal seal between the conical sealing surface and rounded body surface
Data Source
Figure 1
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AI summary
A fitting for use with a cable contained in a corrugated metal tubing, the fitting including an adaptor having an internal, longitudinal passage to receive the cable; a body coupled to the adaptor; an internal seal positioned between the adaptor and the body, the internal seal radially disposed about the cable; a nut coupled to the body; and a sealing member positioned between the nut and the body, the sealing member for placement in a valley of the corrugated metal tubing to compress a portion of the corrugated metal tubing between the sealing member and the body.