Cable Feedthrough Sealing With Axial Compression and No Shear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cable bushing technologies face challenges in providing a simple, cost-effective, and reliable seal for pre-assembled electrical cables, particularly due to complex handling requirements and limited adaptability to various housing dimensions, often resulting in undesirable shear forces and restricted cable sizes.
Innovation Solution
A cable feedthrough system featuring a cover with two housing shells, an elastic sealing element, and a counter-pressure plate that applies axial pressure, ensuring a secure seal without shear forces, and allowing for flexible adaptation to different cable and housing sizes through a conically widened opening and continuous cable passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw connection piece is used to apply pressure to a seal, then the seal is secured, but shear forces are generated that adversely affect the sealing element
Solution Approach 1:
Instead of applying pressure from the front (which generates shear forces), the patent applies pressure from the rear using a counterpressure plate. This inverted approach pushes the sealing element against the conically widened opening, creating compression without shear forces and eliminating the harmful side effect while maintaining sealing reliability
Solution Approach 2:
The patent replaces the screw connection mechanism (which generates shear forces through threading) with a direct axial pressure application system using a counterpressure plate. This substitution eliminates the mechanical complexity and harmful shear forces while achieving the same sealing function through pure compressive force
2Reliability
If a block-shaped insert with zigzag-shaped slot is used, then sealing is achieved, but cable insertion becomes cumbersome and costly
Solution Approach 1:
Instead of using a zigzag-shaped slot that requires complex opening and closing operations, the patent inverts the approach by using a simple axial slot that opens automatically when the sealing element is compressed. This allows cable insertion from the rear without cumbersome handling, maintaining sealing quality while dramatically improving ease of operation
Solution Approach 2:
The sealing element is pre-compressed between the cover and counterpressure plate, which automatically opens the slot before cable insertion. This preliminary compression action prepares the system for easy cable access without requiring manual manipulation of complex slot mechanisms
3Reliability
If axial pressure is applied to a sealing element, then sealing is improved, but the sealing element is subjected to compression that may deform it
Solution Approach 1:
The patent changes the geometric parameters of the opening (conical widening) to match the compression direction of the sealing element. By aligning the cone angle with the compression force, the sealing element deforms uniformly along its axis without lateral buckling or distortion, maintaining shape stability while achieving effective sealing through compression
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 stable, easy-to-handle, and cost-effective cable bushing with a reliable seal suitable for a wide range of cables and housings, eliminating shear forces and accommodating cables of various dimensions.
Implementation Method 1
at least one elastic and/or flexible sealing element is provided to seal the housing
Data Source
Figure 1
Figure 2a~2c
Figure 3a~3e
AI summary
The invention relates to a cable feedthrough for feeding at least one cable (4) into a housing (1) with an opening (10) that is provided with a covering (112) comprising at least two housing shells (11, 12), said covering (112) having at least one opening (14), wherein a separating plane of the housing shells (11, 12) extends centrally through said opening (14); and wherein to seal the housing (1), at least one elastic and/or flexible sealing element (3) is provided that comprises a cable passage (34) with a slit (340) extending to the lateral edge of said cable passage; and wherein a counter pressure plate (2) is provided that comprises at least one cable passage (234) and covers the opening (10), said counter pressure plate (2) cooperating with the sealing element (3) and the covering (112) to seal the housing (1). The sealing element (3) is arranged with a predetermined oversize between the covering (112) and the counter pressure plate (2) and is under pressing force, as a result of which the sealing element (3) is compressed.