Monolithic Inner Phase Housing for Water-Tight Underground Link Boxes
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Solution Overview
Problem
Existing underground link boxes suffer from insufficient stability against ground movement and water ingress, leading to potential catastrophic failures and reduced service life.
Innovation Solution
The inner phase housing is designed as a one-piece component, integrally formed with feed-through protrusions and busbars, providing enhanced resistance to water ingress and stability through a stiffening structure, eliminating the need for additional assembly steps and resin filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inner phase housing is constructed using multiple moldings assembled around electrical components and encapsulated in resin, then electrical components can be protected, but moisture ingress occurs due to joints between moldings and the construction becomes complex
Solution Approach 1:
The patent merges multiple separate moldings into a single integral inner phase housing that is injection molded around the electrical components. This eliminates the joints between moldings that caused moisture ingress while simplifying the construction. The housing forms as one piece during injection molding, providing continuous protection without requiring assembly of multiple parts.
2Reliability
If inner phase housing is constructed using multiple moldings and resin encapsulation, then electrical components are protected, but additional assembly steps and resin filling are required
Solution Approach 1:
The electrical components are positioned within the mold cavity before the injection molding process begins. The housing is then molded around them in a single operation, eliminating the need for subsequent assembly steps and resin filling. This preliminary positioning of components allows the protection structure to be formed integrally during the molding process itself.
3Ease of operation
If conventional inner phase housing is used, then installation can proceed, but stability against ground movement is insufficient leading to catastrophic failure
Solution Approach 1:
The patent employs a composite construction where the inner phase housing is made from a resilient material that can accommodate ground movement. This resilient material absorbs mechanical stresses from ground settlement or shifting, preventing the catastrophic failures that occur with rigid conventional housings while maintaining installation simplicity.
4Ease of manufacture
If conventional inner phase housing with multiple joints is used, then components can be assembled, but water ingress occurs due to insufficient or damaged moisture sealing
Solution Approach 1:
The patent eliminates the multiple joints between separate moldings by forming the inner phase housing as a single integral piece through injection molding. This continuous structure removes the pathways for water ingress that exist at joints in conventional constructions, providing effective moisture sealing while maintaining ease of manufacture through the molding process.
Data Source
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AI summary
The invention relates to an inner phase housing (1) for an underground link box (3), the inner phase housing (1) comprising at least one phase pocket (5) in which phase link posts (7) are provided, a plurality of conductor rods (25) for connecting at least two low-voltage cables (33), and a base section (11) to which the at least one phase pocket (5) is mounted. The invention further relates to an assembly (67) comprising a housing part (69) for receiving an inner phase housing (1). Solutions of the art comprise a multitude of molded parts that require assembly, where in during assembly a plurality of joints are necessary. Those joints are prone to water ingress. The invention improves inner phase housings (1) and assemblies (67) of the art in that the inner phase housing (1) is formed as a single, monolithic piece (39).