EMC Cable Gland Shielding Structure for Quick Grounding
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Solution Overview
Problem
Conventional electromagnetic compatibility type cable locking joints face difficulties in quick grounding, inconvenient installation, poor shielding performance, and susceptibility to high-voltage breakdown due to small grounding areas and time-consuming shielding layer cutting.
Innovation Solution
A cable locking joint design featuring a tubular central hole with an inner step, a sealing ring, and a shielding member with arc-shaped elastic pieces that allow direct cable insertion, increased grounding area, and enhanced sealing, utilizing a flange and sealing washer for improved waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shielding layer is cut open and the shielding ring is placed between the conducting thin-wires and the shielding layer, then electromagnetic compatibility is achieved, but the installation becomes troublesome and time-consuming
Solution Approach 1:
The patent extracts the shielding ring from the complex assembly process and integrates it with the cable gland body into a unified structure. The shielding ring is pre-installed and fixed to the cable gland body, eliminating the need for separate installation steps and the troublesome cutting of the shielding layer.
Solution Approach 2:
The patent merges the shielding ring installation with the cable gland assembly process. The shielding ring is combined with the cable gland body to form an integrated structure, so that when the cable is inserted, both the gland and shielding are installed simultaneously, reducing installation time and complexity.
2Reliability
If the nylon clamping jaw is used to lock the cable tightly, then high electromagnetic compatibility is achieved, but high temperature is generated causing hot-melting of the cable insulating layer
Solution Approach 1:
The patent changes the material parameter of the clamping jaw from nylon to metal material. This parameter change allows the clamping jaw to maintain mechanical strength and clamping force while having better heat resistance, preventing the hot-melting of the cable insulating layer that occurs with nylon materials.
3Strength
If the conventional cable locking joint structure is used, then the cable is locked tightly, but the grounding area is small resulting in poor shielding effect
Solution Approach 1:
The patent extends the grounding structure from a simple ring to a multi-dimensional configuration with the shielding ring having both radial extension and axial positioning. The shielding ring protrudes from the cable gland body and makes contact with the cable shielding layer over a larger surface area, increasing the grounding area in multiple spatial dimensions.
Solution Approach 2:
The patent pre-positions the shielding ring on the cable gland body before cable installation. The shielding ring is already in place and properly positioned to maximize contact with the cable shielding layer, ensuring optimal grounding area is achieved automatically when the cable is inserted, without requiring additional adjustment.
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
Enables quick, efficient, and reliable installation with enhanced shielding and sealing, preventing surge and high-voltage breakdown, while ensuring quick grounding without cutting the shielding layer.
Implementation Method 1
a plurality of arc-shaped elastic pieces, where the arc-shaped elastic pieces are circumferentially uniformly arranged, where the upper end of each arc-shaped elastic piece is formed on the upper ring, and the lower end of each arc-shaped elastic piece is formed on the lower ring, where the middle portion of the arc-shaped elastic piece is bent towards a line passing through the centers of the upper ring and the lower ring
Data Source
Figure 1
Figure 2
AI summary
Disclosed in the present disclosure is an electromagnetic compatibility type cable locking joint, and solves the problems that an existing cable joint is inconveniently connected to the cable and has poor shielding effect. The electromagnetic compatibility type cable locking joint comprises a joint main body, a joint cap, a sealing ring and a shielding member. The joint main body has a central hole, and an inner step is provided in the central hole. The sealing ring is connected to the end of the joint main body, and a positioning groove is formed between the sealing ring and the inner step. The joint cap is connected to the sealing ring, the shielding member comprises an upper ring, a lower ring and an arc-shaped elastic piece. The number of the arc elastic pieces is multiple and the arc-shaped elastic pieces are uniformly arranged in a circle. The upper end of each arc-shaped elastic piece is formed on the upper ring, and the lower end of each arc-shaped elastic piece is formed on the lower ring.