Optical Fiber Housing Cable Sealing Segmentation
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Solution Overview
Problem
Existing optical fiber connection box technologies face sealing issues due to frequent interventions, which can lead to leaks, especially with the increased maintenance needs of FTTH programs.
Innovation Solution
A connection box design featuring a separate support element for the main cable, allowing for distinct sealing from the casing body and cover, with an additional opening for the main cable fibers and a secondary cable support area with a cable gland, along with elastomeric gel sealing and latches for secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cables are passed through the closure plane between the housing body and the lid, then cable access is enabled, but the tightness of the cables deteriorates when the box is reopened for maintenance
Solution Approach 1:
The patent divides the cable support function into a separate removable support element that is distinct from the housing body. This support element can be detached and reattached during maintenance operations, allowing the closure plane to be reopened without compromising the sealed openings in the support element itself. The segmentation isolates the cable access function from the housing-sealing function.
Solution Approach 2:
The support element acts as an intermediary component between the housing body and the cables. It provides a dedicated interface for cable passage with integrated sealing, mediating between the need for cable access and the requirement for maintaining tightness. The support element's openings are specifically designed to maintain seals even when the support element itself is removed and reattached.
2Ease of operation
If an intermediate piece is used to close the opening during installation, then cable entry is enabled, but a triple sealing point must be managed between the housing body, the cable and the intermediate piece
Solution Approach 1:
The support element consolidates multiple sealing functions into a single integrated component. Instead of managing separate sealing points between the housing body, intermediate piece, and cable, the support element provides a unified interface with pre-configured openings that inherently maintain seals. This reduces the number of independent sealing management points from three to one.
Solution Approach 2:
The support element serves multiple functions simultaneously: it provides structural support for cables, creates sealed openings for cable passage, and acts as a removable interface for maintenance. This multi-functionality eliminates the need for separate intermediate pieces and reduces overall sealing complexity.
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 design maintains excellent sealing integrity during maintenance and allows for various fiber connection methods without compromising the tightness of the cables, ensuring reliable protection against water ingress.
Implementation Method 1
A sealing material, preferably a material comprising an elastomeric gel, is advantageously placed around at least one unsheathed portion of the main cable, between the support element and the casing body.
Data Source
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AI summary
The housing (1) has a cover (5) that is in contact with a contact area (2d) of a housing body (2) so as to cover the body. A connection unit i.e. cassette (3), connects optical fibers. A support element (4) is distinct from the body, and is fixable on the body. The body includes an opening (2a) separated from another opening defined by the contact area. The former opening allows a passage of the fibers from a main cable towards the connection unit when the support element is fixed to the body so as to dissociate sealing of the cable from sealing between the body and the cover.