Explosion-Proof Cable Entry Body With Deformation-Decoupled Sealing
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Solution Overview
Problem
Existing explosion-proof line feed-throughs face challenges in providing a reliable, flame-proof connection for varying line diameters without requiring excessive elastomeric material, which can compromise the connection integrity.
Innovation Solution
A connection body with a plastically deformable deformation section and a transition section that decouples from the connection section, allowing for a force-fit and flame-proof connection with lines of different diameters, using a metal or metal alloy material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a thicker elastomeric inner sleeve is used to accommodate thinner lines, then the ability to guide lines of different diameters is improved, but the pressing force between the inner sleeve and the line decreases
Solution Approach 1:
The connection body is divided into three distinct sections with different wall thicknesses: a first longitudinal part with greater wall thickness for high pressing force, a transition section with smaller wall thickness for adaptability, and a connection section with greater wall thickness for structural integrity. This segmentation allows each section to fulfill its specific function optimally.
Solution Approach 2:
Different sections of the connection body have different wall thicknesses tailored to their specific functions. The first longitudinal part has thicker walls for maximum pressing force on thin lines, the transition section has thinner walls for flexibility and adaptability, and the connection section has thicker walls for maintaining the flame-proof gap. This local differentiation of properties resolves the contradiction between adaptability and pressing force.
2Reliability
If the deformation section is deformed radially inwardly to create a force-fit connection, then the connection reliability is improved, but the deformation requires high quality surface precision to maintain flame-proof gap
Solution Approach 1:
The connection body is segmented into a deformation section and a connection section, with the deformation section further divided into a first longitudinal part and a transition section. This segmentation isolates the deformation process to specific regions, preventing surface precision requirements from affecting the entire component, particularly protecting the connection section's outer surface.
Solution Approach 2:
The transition section acts as an intermediary between the deformation section and the connection section. It absorbs and distributes deformation stresses, preventing them from propagating to the connection section's outer surface. This mediator role allows radial deformation for force-fit connection while maintaining the surface precision required for the flame-proof gap.
3Adaptability or versatility
If a transition section with smaller wall thickness is introduced between deformation section and connection section, then the deformation can be decoupled from the connection section, but the structural complexity increases
Solution Approach 1:
The connection body is segmented into three functional sections with varying wall thicknesses, creating a gradient structure that provides deformation decoupling. While this increases structural complexity, each segment serves a clear, specific function that simplifies the overall design logic and manufacturing process.
Solution Approach 2:
The wall thickness parameter is varied continuously across the three sections, creating a gradient from thick to thin and back to thick. This parameter change approach provides an elegant solution for deformation decoupling, allowing the transition section to flex while the connection section remains rigid, without requiring additional components or complex mechanisms.
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
Ensures a secure, flame-proof connection without elastomeric layers, maintaining the connection section's geometry and integrity, suitable for various line diameters, and adhering to explosion-proof standards.
Implementation Method 1
a deformation section made of a plastically deformable material configured to be plastically deformed starting from the initial condition of connection body
Implementation Method 2
the deformation section is configured to abut against the line in the use condition and to establish a force-fit and flame-proof connection with the line
Implementation Method 3
The line feed-through thereby avoids that an ignition medium, for example hot gases, sparks, flames or the like, can pass through the wall opening into an area where an explosive atmosphere is present
Data Source
AI summary
The present disclosure relates to a connecting body for producing an explosion-proof cable entry gland and/or cable bushing. The connecting body has three sections arranged next to one another in a longitudinal direction, namely a deformation section, a transition section and a connecting section. The transition section preferably directly adjoins the deformation section and/or the connecting section. A line duct which extends in the longitudinal direction passes through the connecting body, wherein a line can be fed through the line duct in an initial state of the connecting body. The deformation section is provided and configured to be plastically deformed so that a flameproof and force-fitting connection is produced between the deformation section and the line which is fed through the line duct. The transition section decouples the deformation section from the connecting section and prevents the plastic deformation of the deformation section also leading to undesired deformation of the connecting section. The connecting section is provided and configured to produce a flameproof connection to a wall opening or a lead-through opening of an external part.