Cable Shield Feedthrough With Axial Clamping Contact
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Solution Overview
Problem
Conventional methods for contacting the shields of high-voltage shielded cables in housing feedthroughs often apply torsional forces, risking wire breakage and potential short circuits, and fail to ensure full circumference contact.
Innovation Solution
A housing feedthrough design featuring a screw-in sleeve with a through-hole and a clamping body, where an axial compressive force is applied to ensure secure shield contact without torsional forces, and a conical design enhances the surface area for improved electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crimp connections are used to contact cable shields, then electrical contact is achieved, but tensile and torsional forces are exerted on the shield causing wire breakage and potential short circuits
Solution Approach 1:
The shield contact function is segmented into two independent components: the clamping body that provides radial compression force, and the screw-in sleeve that provides axial positioning and sealing. This segmentation eliminates the torsional forces that would be generated by a single integrated crimp connection, as each component performs its function independently without imposing rotational stress on the shield wires.
Solution Approach 2:
Instead of applying radial compression through a rotating crimp action (conventional approach), the invention applies axial compression through the screw-in sleeve and clamping body assembly. The force application direction is inverted from radial crimping to axial pressing, which eliminates torsional forces while maintaining effective electrical contact through the compressed shield wires between the clamping body and screw-in sleeve.
2Reliability
If conventional crimp connections are used to contact cable shields, then electrical contact is achieved, but individual wires in the shield could break off causing short circuits
Solution Approach 1:
The design incorporates a conical cavity in the screw-in sleeve and a conical clamping body that gradually compress the shield wires as the assembly is tightened. This gradual, distributed compression acts as a cushioning mechanism that prevents sudden stress concentration on individual wires, thereby preventing wire breakage before it can occur. The conical geometry ensures progressive deformation rather than abrupt crimping.
3Reliability
If conventional shield connections are used, then electrical contact is achieved, but the shield is not contacted across its entire circumference
Solution Approach 1:
The invention transitions from point or line contact (conventional crimp connections) to surface contact across the entire circumference. The conical cavity in the screw-in sleeve and conical clamping body create a distributed contact surface that engages the shield wires around the entire circular cross-section, effectively utilizing the third dimension (circumferential area) to achieve comprehensive electrical contact.
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 prevents wire breakage and short circuits by eliminating torsional forces and ensuring comprehensive shield contact, while the conical design improves electrical contact reliability.
Implementation Method 1
The screw-in sleeve is provided with an external thread and the clamping stamp with an internal thread, which can be brought into engagement with each other.
Implementation Method 2
A housing feedthrough comprises a clamping plunger, which interacts with the screw-in sleeve to exert an axial compressive force on the clamping body, directed toward the screw-in sleeve.
Data Source
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AI summary
A housing feedthrough suitable for contacting a shield (103) of a shielded cable (101), and a method for contacting the shield are proposed. The housing feedthrough has a screw-in sleeve (201) with a through-opening (203). The through-opening (203) in the screw-in sleeve (201) comprises a cavity (205) in which a clamping body (112) with a central through-bore (113) can be received. A shielded cable can be received in the through-bore (113) of the clamping body. The housing feedthrough comprises a clamping plunger (111) which interacts with the screw-in sleeve (201) to exert an axial compressive force on the clamping body (112) directed towards the screw-in sleeve (201).