Electric Wire Protective Tube with Segmented Shielding
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Solution Overview
Problem
Conventional electric wire protective tubes suffer from a deterioration of electromagnetic shielding effect due to strain on the inner shield portion caused by stress from the exterior portion during bending, leading to potential damage.
Innovation Solution
The electric wire protective tube features a straight tube section with a firmly attached inner shield portion and a bendable tube section where the inner shield portion is separable from the exterior portion, allowing for a clearance gap and a corrugated exterior shape, preventing damage and maintaining electromagnetic shielding effectiveness during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner shield portion is firmly attached to the exterior portion in the bendable tube section, then the structural strength is improved, but the electromagnetic shielding effect deteriorates due to strain on the inner shield portion during bending
Solution Approach 1:
The tube is divided into a straight tube section where the inner shield portion is firmly attached to the exterior portion, and a bendable tube section where the inner shield portion is separable from the exterior portion. This segmentation allows the straight section to provide structural strength through firm attachment while the bendable section maintains electromagnetic shielding by preventing strain on the inner shield portion during bending operations.
2Reliability
If the inner shield portion is separable from the exterior portion in the bendable tube section, then the electromagnetic shielding effect is maintained during bending, but the structural strength decreases
Solution Approach 1:
The attachment state of the inner shield portion varies by location: in the straight tube section, the inner shield portion is firmly attached to provide structural strength, while in the bendable tube section, the inner shield portion is separable to maintain electromagnetic shielding effect during bending. This local differentiation of attachment quality resolves the contradiction between strength and shielding reliability.
3Ease of operation
If the inner diameter of the exterior portion is increased in the bendable tube section to form a clearance gap, then the ease of bending is improved, but the manufacturing precision decreases
Solution Approach 1:
The bendable tube section is pre-formed with a larger inner diameter and clearance gap between the inner shield portion and exterior portion before bending operations. This preliminary dimensional adjustment facilitates easier bending by providing space for the inner shield portion to move independently, while the precision is maintained through controlled manufacturing processes that ensure the clearance gap remains within specified tolerances.
Data Source
AI summary
An electric wire protective tube is configured such that a straight tube section in a shape of a straight tube and a bendable tube section that is bendable are provided along a longitudinal direction, and is configured to have a shape of a tube that allows an electric wire to be arranged therein. The electric wire protective tube has a tubular inner shield portion made of an electrically conductive material and forming an inner surface of the tube, and an exterior portion made of resin and forming an outer surface of the tube. The inner shield portion is provided such that it is firmly attached to an inner surface of the exterior portion in the straight tube section, and such that it is separable from an inner surface of the exterior portion in the bendable tube section.