Replaceable Bushing Assembly for Sealed Electrical Housings
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Solution Overview
Problem
Existing bushing assemblies in capacitor units cannot be easily replaced after the housing is sealed, as the inner bushing member is inaccessible once the lid is welded, leading to the need for replacing the entire unit upon damage.
Innovation Solution
A bushing assembly design featuring first and second bushing members, where the first members are seated in openings with protrusions to prevent movement and are releasably attached to a second member on the inside of the panel, allowing replacement without accessing the second member, and connection means engage on the inside to prevent external protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lid is welded to seal the capacitor housing, then the housing is sealed and protected, but the inner bushing member becomes inaccessible and cannot be replaced
Solution Approach 1:
The bushing assembly is divided into two separable parts: an outer bushing member that remains accessible after housing sealing, and an inner bushing member that can be replaced. The outer member includes an external portion extending beyond the panel and an internal portion that engages with the inner member, allowing the inner member to be replaced without accessing the sealed housing interior.
Solution Approach 2:
The outer bushing member acts as an intermediary component that bridges the sealed housing interior and the external environment. It provides a replacement mechanism through its internal portion that engages with the inner bushing member, enabling maintenance without compromising the housing seal.
2Strength
If the outer bushing member is secured with a nut inside the housing, then the bushing is firmly fixed, but the nut cannot be reached after the lid is welded
Solution Approach 1:
The fastening function is extracted from the interior of the sealed housing and relocated to the exterior. The outer bushing member's internal portion provides engagement features that can be accessed and operated from outside the sealed housing, eliminating the need to access the interior for maintenance operations.
Solution Approach 2:
Instead of securing the bushing from the interior side (where the nut would be inaccessible), the design inverts the approach by providing engagement features on the outer bushing member that can be accessed and operated from the exterior side, reversing the traditional fastening direction.
3Reliability
If the entire capacitor unit must be replaced upon bushing damage, then component reliability is maintained, but cost and time are significantly increased
Solution Approach 1:
The bushing assembly is segmented into replaceable inner and outer members, allowing only the damaged inner member to be replaced while retaining the outer member. This selective replacement maintains component integrity while significantly reducing replacement time and cost compared to replacing the entire capacitor unit.
Solution Approach 2:
The design enables discarding only the damaged inner bushing member while recovering and retaining the outer bushing member. This partial replacement approach maintains system reliability by replacing only the necessary component, avoiding the waste and time loss associated with replacing the entire unit.
Data Source
AI summary
A bushing assembly for mounting in openings of a panel of a housing for electrical equipment, such as a capacitor housing. The bushing assembly includes a plurality of first bushing members releasably attachable through a respective one of said openings of the panel to a single second bushing member positioned on an inside of the panel inside the housing.