Off-Center Cable Bushing for IP66 Sealing
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Solution Overview
Problem
Existing cable bushings do not achieve a high level of leak-tightness against water and moisture, particularly failing to meet the protective classes IP66 and IP67, due to their center division and clipping mechanism which lacks effective sealing.
Innovation Solution
A cable bushing with off-center division of its partial elements, featuring a screw connection and seal elements, where the thread is only present on a portion of the circumference, and incorporating metallic threaded bushes and guide elements for secure assembly and enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cable bushings use a center division with clipping mechanism, then installation is simple and rapid, but leak-tightness against water and moisture is insufficient
Solution Approach 1:
The cable bushing is divided into two partial elements that can be assembled separately around the cable and then connected together, enabling simple installation while maintaining sealing capability through the screw connection and seal elements
Solution Approach 2:
Seal elements are introduced as intermediary components between the two partial elements to create an effective sealing barrier, preventing water and moisture penetration while allowing the bushing to be assembled in two parts for ease of installation
2Ease of manufacture
If cable bushings use center division, then the structure is symmetric and easy to manufacture, but the division joints cannot achieve high leak-tightness
Solution Approach 1:
The division is intentionally made off-center rather than at the center, creating an asymmetric configuration where the division joints are positioned to avoid the cable region, thereby achieving both manufacturability and high sealing performance
3Reliability
If the division is made off-center, then leak-tightness level IP66/IP67 is achieved, but the structure becomes more complex
Solution Approach 1:
The off-center division creates an asymmetric structure that positions the division joints away from the cable, enabling high leak-tightness while the modular two-part design keeps the overall complexity manageable
4Force
If screw connection is used instead of clipping, then clamping forces are higher and sealing is improved, but installation becomes slightly more complex
Solution Approach 1:
The connection method is changed from clipping to screw connection, altering the mechanical parameters to provide higher clamping forces and improved sealing, while the off-center division keeps the installation process relatively simple
Data Source
AI summary
The invention relates to a cable bushing to be screwed together with a wall comprising a passage for at least one prefabricated cable, comprisingtwo partial elements, which are screwed together with one another in the installed state,a threaded section, which is formed by the two partial elements in each case in a part of its circumference, and comprises a thread, for feeding through the passage,a receptacle section adjoining thereon in the axial direction of an axis of rotation of the threaded section, whichhas a larger external diameter than the threaded section at least in sections, and whichcomprises at least one receptacle opening for accommodating at least one strain relief bushing.The cable bushing according to the invention is characterized in that the division between the two partial elements is formed off-center, so that the circumference of the receptacle opening extending around the at least one strain relief bushing is greater in one of the partial elements than in the other of the partial elements.