Cable Bushing Structure for Multi-Diameter Sealing and Strain Relief
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Solution Overview
Problem
Existing cable bushings are complex and lack a compact, universally usable design for reliable sealing across various cable diameters.
Innovation Solution
A cable bushing with a two-part frame housing and elastic sealing elements that form multiple tubular channels through a tongue-and-groove mechanism, providing multiple sealing regions and strain relief with transverse ridges and recesses, and adjustable penetration depth to accommodate different cable diameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable bushing uses multiple sealing lips arranged one behind the other in the axial direction, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple sealing lips into a single sealing element with multiple sealing regions arranged axially. This single integrated sealing element provides the sealing function of multiple separate lips while reducing device complexity by eliminating the need for multiple separate components and their associated mounting structures.
Solution Approach 2:
The sealing element is segmented into multiple sealing regions along the axial direction, with each region capable of sealing different cable diameters. This segmentation allows the single component to handle multiple sealing requirements that would otherwise require multiple separate sealing elements.
2Adaptability or versatility
If a cable bushing is designed to accommodate different cable diameters, then adaptability is improved, but device complexity increases
Solution Approach 1:
The cable bushing is designed as a universal component with a sealing element that contains multiple sealing regions, each capable of sealing different cable diameters. This multi-functional design allows a single bushing to serve multiple cable sizes without requiring separate bushings for each diameter, thereby improving adaptability while maintaining simple device structure.
Solution Approach 2:
Instead of providing multiple separate bushings for different cable diameters (horizontal dimension), the invention stacks multiple sealing regions in the axial dimension. This dimensional transition allows a single bushing to accommodate various cable diameters by selecting the appropriate sealing region, simplifying the overall device structure while maintaining versatility.
3Device complexity
If a cable bushing uses a compact design, then device complexity is reduced, but sealing reliability may worsen
Solution Approach 1:
The sealing element is inserted into a housing with a corresponding groove, creating a nested structure where the sealing element fits within the housing. This nested design maintains compactness while ensuring reliable sealing through the precise fit between the sealing element and housing, eliminating the need for complex external sealing mechanisms.
4Reliability
If a cable bushing provides strain relief, then cable protection is improved, but device complexity increases
Solution Approach 1:
The strain relief function is merged with the sealing element and housing structure. The housing provides strain relief through its rigid structure and the way it receives the sealing element, combining the sealing and strain relief functions into a single integrated design rather than requiring separate strain relief components.
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 achieves a compact, reliable sealing mechanism that can accommodate various cable diameters, ensuring effective strain relief and secure cable passage while preventing unintended removal.
Implementation Method 1
a sealing element composed of an elastic material is introduced
Implementation Method 2
the two sealing elements engage into the corresponding longitudinal grooves with their corresponding longitudinal walls, in the manner of a tongue and groove, so that a corresponding press-down pressure is applied
Data Source
AI summary
A cable bushing having a two-part, frame-shaped housing having lower and upper housing parts forming a passage opening in the installed position. An elastic sealing element is inserted into the lower and upper housing parts, respectively. The two sealing elements close the passage opening in the installed position, forming adjacent tubular cable bushing channels. The corresponding cable bushing channel is formed by semi-tubular recesses in the corresponding sealing element. Each sealing element has parallel longitudinal walls, separated from one another by longitudinal grooves, respectively. The innermost longitudinal wall is closed. For forming the corresponding cable bushing channel, the other longitudinal walls have semi-tubular recesses with a decreasing radius from the outermost to the second innermost longitudinal wall. One sealing element has transverse ridges between adjacent cable bushing channels orthogonally to the longitudinal walls. The other sealing element has recesses complementary to the ridges in the longitudinal walls.