Explosion-Proof Cable Bushing With Interference-Fit Bearing Block
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Solution Overview
Problem
Existing cable bushing solutions for potentially explosive areas are cumbersome, costly, and difficult to handle due to their thickness and complex end connections, which complicates the protection of cables and electronic apparatus from mechanical and pressure-related hazards.
Innovation Solution
A cable bushing design featuring a hollow metal tube with a narrow fit into a bearing block, secured through interference fit, thermal shrinkage, soldering, welding, or adhesive fixation, allowing for flexible adaptation and high-tightness protection up to IP68, with optional radial expansion and conductive adhesive for secure electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal fabric is provided on the cable to protect it from external mechanical influences, then the cable is protected from mechanical damage, but the cable arrangement becomes relatively thick and difficult to handle
Solution Approach 1:
The invention extracts the protective function from the cable itself and transfers it to a separate bearing block with integrated sealing. The bearing block houses the cable entry and provides mechanical protection and sealing, allowing the cable to remain thin and flexible while still achieving protection against mechanical influences and IP68 sealing.
2Object-affected harmful factors
If the cable is provided with metal fabric protection, then mechanical protection is improved, but the end connection to the sensor or housing becomes complicated and expensive
Solution Approach 1:
The invention merges the cable protection function, sealing function, and connection function into a single integrated bearing block. This eliminates the need for separate metal fabric armor and complex connection mechanisms, simplifying both the structure and the end connection process while maintaining IP68 protection.
3Reliability
If a stable housing with special cable housing is used to meet safety requirements, then explosion protection and mechanical protection are improved, but the procedure becomes very cumbersome and cost-intensive
Solution Approach 1:
The bearing block serves multiple functions simultaneously: it provides mechanical protection for the cable entry, ensures IP68 sealing through integrated gaskets, enables explosion protection through proper material selection and design, and facilitates easy installation. This multi-functionality eliminates the need for separate specialized housings and cable management components.
4Adaptability or versatility
If the metal tube is made soft and deformable for manual bending, then adaptability to installation conditions is improved, but the structural strength may be reduced
Solution Approach 1:
The invention changes the material parameters of the metal tube by selecting specific materials and dimensions (diameter 2-5 mm, wall thickness 0.3-0.8 mm) that provide an optimal balance between softness for manual bending and sufficient structural strength. The tube can be bent manually to adapt to installation conditions while maintaining adequate strength for its protective function.
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 solution provides a simple, cost-effective, and reliable cable protection system that ensures secure connections and pressure-tight seals, reducing installation complexity and costs while maintaining electrical integrity and adaptability to various structural conditions.
Implementation Method 1
The fixation of the metal tube can, for example, be provided by an interference fit
Implementation Method 2
The fixation of the metal tube can, for example, be provided by an interference fit or as the result of thermal shrinkage
Implementation Method 3
it can be provided that the metal tube is soldered and in particular hard-soldered to the bearing block
Implementation Method 4
Alternatively or additionally to the soldering, it can be provided that the metal tube is welded to the bearing block
Implementation Method 5
or in glued over its entire circumference in the through-hole by an adhesive
Implementation Method 6
The metal tube can also be axially fixed in the through-hole by a radial expansion, i.e. in a positive manner
Data Source
AI summary
A cable bushing includes a metal tube, at least one cable for signal transmission received from a sensor which extends in an opposite direction inside the metal tube, which, in at least one axial end region sits with an immovable fit in a through-hole of a bearing block. The bearing block is arranged in a sealed manner in a passage of a housing wall or is connected in a sealed manner to the sensor.