Cable Entry Design for Coaxial Assembly and Dielectric Protection
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Solution Overview
Problem
Existing cable entry solutions for coaxial cables are complex, requiring numerous components and tools, leading to difficult assembly and potential deformation of the dielectric material, which affects transmission properties.
Innovation Solution
A cable entry design featuring a housing with a variable bore diameter, a contact sleeve with O-rings for secure positioning, and a nipple for controlled clamping of the outer conductor, allowing for easy assembly and preventing dielectric deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a clamping sleeve with conical shape is used to clamp the outer conductor, then the assembly is simplified, but the dielectric underneath the outer conductor is compressed and deformed, leading to impedance jump and poorer transmission properties
Solution Approach 1:
The clamping function is segmented from the compression function. The clamping sleeve provides mechanical clamping of the outer conductor, while a separate compression-free zone (protected by the cable entry housing) prevents compression of the dielectric. This segmentation allows the clamping action to occur without transmitting compressive forces to the dielectric layer.
Solution Approach 2:
The cable entry housing acts as an intermediary element between the clamping sleeve and the dielectric. It absorbs and distributes the clamping forces, preventing direct transmission of compressive forces to the dielectric material. The housing design includes a compression-free zone that physically isolates the dielectric from harmful compression.
2Manufacturing precision
If multiple components and seals are used to prevent deformation, then the dielectric integrity is maintained, but the device complexity and assembly difficulty increase
Solution Approach 1:
Multiple functions are merged into the cable entry housing: it provides structural support, defines the compression-free zone, guides the clamping sleeve, and protects the dielectric from compression. This consolidation reduces the total number of separate components while maintaining dielectric integrity through the integrated compression-free zone design.
Solution Approach 2:
The cable entry housing serves multiple purposes simultaneously: it acts as a protective barrier, a structural support element, a guide for assembly, and a defining element for the compression-free zone. This multi-functionality reduces component count while ensuring dielectric protection.
3Ease of operation
If the outer sheath is removed before pushing the sleeve onto the cable, then the sleeve can be installed, but the risk of unintentional deformation of the outer conductor increases
Solution Approach 1:
The cable entry housing is designed in advance with a compression-free zone and proper dimensional relationships that prevent deformation during assembly. This preliminary design consideration eliminates the need to remove the outer sheath, as the housing accommodates the complete cable structure and provides protection from the outset.
Solution Approach 2:
The cable entry housing is designed to accommodate the complete cable structure including the outer sheath, providing a cushioning effect that prevents unintentional deformation of the outer conductor during assembly. The housing dimensions are carefully designed to allow the sleeve to be pushed onto the cable while maintaining protection of all cable layers.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a cable entry (1) with a housing (2), a contact sleeve (7) arranged in a hole (3), and a nipple (9) screwed into the housing (2). Retaining means (13, 16) prevent an uncontrolled twisting of the contact sleeve (7) relative to the housing (2).