Cable Lead-Through Device Sealing and Strain Relief
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Solution Overview
Problem
Existing cable bushing devices face challenges in providing consistent sealing and strain relief for cables of different diameters, often requiring precise cutouts and multiple complex components, leading to inefficient installation and reduced packing density.
Innovation Solution
A cable bushing device comprising a structural frame with bores of varying diameters and an elastic soft component with puncture membranes, where the soft component is integrally connected to the frame and protrudes to form a gas-tight and liquid-tight interface, allowing for easy installation and accommodating cables of different sizes with high packing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cables are passed between several layers of compressible material with a holding device, then multiple cables can be fixed simultaneously, but the cutouts must be matched very precisely to the cable diameter and the pressure distribution is not uniform, resulting in insufficient sealing and strain relief quality
Solution Approach 1:
The device is divided into multiple independent cable bushing modules, each with its own puncture membrane and holding device. Each module can be independently adjusted and optimized for specific cable diameters, ensuring uniform pressure distribution and high sealing quality for each cable while maintaining the ability to handle multiple cables simultaneously.
Solution Approach 2:
Each cable bushing module has locally optimized cutouts and puncture membranes that are precisely matched to specific cable diameters. The holding devices are positioned to apply pressure uniformly at each local position, ensuring that each cable receives optimal sealing and strain relief regardless of the number of cables being installed.
2Reliability
If a single cable bushing module is used for each cable, then uniform sealing and strain relief quality is achieved, but the installation becomes time-consuming and complex and the packing density is limited
Solution Approach 1:
Multiple cable bushing modules are integrated into a single structural frame, sharing common mounting features and overall structure. This merging reduces the total number of separate components and simplifies installation while maintaining the individual optimization of each module for uniform sealing and strain relief.
Solution Approach 2:
The structural frame and mounting system are designed to accommodate multiple cable bushing modules with different cable diameter specifications. The universal mounting interface allows different modules to be combined in various configurations, reducing the need for multiple specialized devices and improving packing density.
3Reliability
If the soft component is compressed between the structural frame and housing wall, then a gas-tight and liquid-tight interface is formed, but the soft component must be maintained in its original shape by the structural frame
Solution Approach 1:
The soft component is designed as a flexible puncture membrane that can be compressed to form sealing interfaces. The structural frame provides rigid support that maintains the overall shape and position of the soft component, while the soft material itself deforms locally to create the sealing action against the housing wall.
Solution Approach 2:
The soft component has an asymmetric design where the majority of the material is contained within the structural frame to maintain shape stability, while a portion protrudes from the frame to be compressed and form the sealing interface. This asymmetric configuration allows the soft component to serve both shape-maintaining and sealing functions simultaneously.
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 ensures optimal sealing and strain relief for cables of varying diameters with a simplified installation process, maintaining the separating function of the partition wall and reducing installation effort while enhancing packing density.
Implementation Method 1
an elastic soft component (3), in particular a rubber component, a polyurethane component, a silicone component, a latex component or a mixture of these materials
Implementation Method 2
The passage is closed by a puncture membrane (32)
Data Source
Figure 1~3
Figure 4~6
Figure 7
AI summary
The invention relates to a cable entry device for the sealed passage of at least one cable through an opening in a housing wall, comprising a structural frame which includes at least one bore for the passage of a cable and at least one screw bore, and an elastic soft component which includes at least one passage point which is closed by a pierceable membrane. According to the invention, the soft component is largely bounded by the structural frame on the surfaces facing away from the housing wall and projects perpendicularly to the housing wall by the height difference from the structural frame.