Cable Gland Lamellar Baskets Strain Relief
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Solution Overview
Problem
Existing cable glands lack long-term tightness and effective strain relief for cables, leading to potential tilting movements and inadequate sealing.
Innovation Solution
The cable gland incorporates two lamellar baskets with elastic clamping sealing rings that are radially acted upon by the lamellar cages, and a radially acting sealing element on the guide sleeve, along with a holding unit that can be displaced along the central axis to apply pressure uniformly to the lamellar cages, enhancing the sealing and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single lamellar basket is used in conventional cable glands, then the structure is simpler, but the cable guidance and strain relief are insufficient, allowing tilting movements
Solution Approach 1:
The holding unit is segmented into two separate lamellar baskets (54, 56) positioned at different locations along the cable path. Each basket independently guides and secures the cable, preventing tilting movements while maintaining manageable structural complexity through modular design
2Reliability
If conventional sealing elements are used without radial acting force, then the structure is simpler, but long-term sealing tightness is insufficient
Solution Approach 1:
The sealing elements (72, 94, 96) are pre-loaded with radial acting force from the lamellar baskets and holding unit pressure surfaces before the cable is fully installed. This preliminary compression ensures immediate sealing contact and maintains long-term tightness against cable sheath and guide sleeve without requiring complex active sealing mechanisms
Solution Approach 2:
The sealing mechanism utilizes radial acting force as a key parameter change, transforming the sealing elements from a passive static seal to an active dynamically compressed seal. This radial compression parameter ensures consistent contact pressure between sealing elements and mating surfaces, significantly improving sealing reliability
3Stress or pressure
If the holding unit is fixed in position, then the structure is simpler, but uniform pressure distribution on both lamellar baskets cannot be achieved
Solution Approach 1:
The holding unit is designed with translational freedom along the central axis, allowing it to dynamically adjust its position in response to cable installation forces. This dynamic capability ensures uniform pressure distribution across both lamellar baskets and sealing elements by automatically centering the holding unit between the cap nut and housing sleeve pressure surfaces
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
This configuration provides improved rigidity and strain relief for cables, prevents tilting, and ensures better sealing by using the clamping sealing rings and radially acting sealing elements, resulting in enhanced long-term tightness and reliability.
Implementation Method 1
an elastic clamping sealing ring (72), which can be acted upon radially to the central axis (42) in the direction of the cable (48) passing through the respective lamellar basket (54, 56)
Implementation Method 2
the guide sleeve (52) is also provided with a radially acting sealing element (94, 96) which can be tightly closed against a cylindrical inner surface (104) of the housing sleeve (12) with a sealing surface (100, 102)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The fitting has a housing unit (10) with a housing sleeve (12) and a cup nut (30), where a retaining unit (50) is arranged in the housing unit and is provided with a guide sleeve (52). The retaining unit includes two lamella baskets (54, 56), which extend from opposing sides of the guide sleeve to opposite directions parallel to a center axis (42). The lamella baskets are loadable by the housing unit. An elastic clamping seal (72) is fitted in one of the respective lamella basket. The seal is radially subjected to the center axis in the direction of carried out cables by the lamella basket.