Wall Bushing Structure Without Axial Dynamic Seals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wall bushings with corrugated tubes face issues such as unreliable dynamic seals due to thermal expansion and contraction, requiring external transition tanks, limited current capability, and high manufacturing costs, along with metal chip generation from friction.
Innovation Solution
A wall bushing design that eliminates the corrugated tube structure by using a transition tank and transition plate connected to form an accommodating cavity, incorporating a protective cover and corrugated tube to prevent debris entry, and employing a filter element for gas exchange, while ensuring stable connections and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial seal is used in corrugated tube, then conductive rod is sealed, but sealing reliability deteriorates due to long-term friction from thermal expansion and contraction
Solution Approach 1:
The patent removes the axial dynamic sealing device from the head assembly, eliminating the source of metal chip generation. The conductive rod passes through the transition plate without axial sealing, so friction and chip generation are avoided entirely.
Solution Approach 2:
The transition tank serves as an intermediary sealed chamber between the head assembly and external components. It provides a sealed environment without requiring axial sealing of the conductive rod, thus preventing metal chip generation while maintaining sealing reliability.
2Object-generated harmful factors
If axial seal is not used, then metal chip generation is avoided, but sealing reliability deteriorates and external transition tank is required
Solution Approach 1:
The transition tank acts as an intermediary sealed chamber that provides the necessary sealing function without requiring axial sealing of the conductive rod. This eliminates metal chip generation while maintaining sealing reliability.
Solution Approach 2:
The transition plate with through-hole replicates the sealing function at a different location (the plate itself rather than along the rod), eliminating the need for continuous axial sealing and preventing metal chip generation.
3Strength
If corrugated tube is used, then conductive rod is protected and tensioned, but manufacturing cost increases
Solution Approach 1:
The patent removes the expensive corrugated tube from the head assembly, eliminating the source of high manufacturing costs while maintaining essential functions through alternative designs.
Solution Approach 2:
The transition tank and transition plate provide the necessary structural support and protection functions that were previously performed by the corrugated tube, achieving the same protective effect at lower cost.
4Reliability
If external transition tank is used, then sealing is improved, but device complexity increases
Solution Approach 1:
The patent merges the transition tank with the head assembly, integrating the sealing chamber into the existing structure. This eliminates the need for separate external transition tanks and reduces overall device complexity while maintaining sealing reliability.
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
Enhances sealing reliability, prevents metal chip generation, and reduces production costs by avoiding axial dynamic sealing devices and corrugated tubes, maintaining structural stability and electrical integrity.
Implementation Method 1
When the conductive rod is heated and elongated
Implementation Method 2
due to the long-term friction of thermal expansion and contraction
Implementation Method 3
the corrugated tube can be elastically deformed, so that the conductive rod remains straight without stress bending
Data Source
AI summary
A wall bushing, comprising a head assembly, a conductive rod, and a connecting terminal sealing and covering the head assembly and the conductive rod. The connecting terminal and the conductive rod are electrically connected. The head assembly includes a transition tank and a transition plate that are connected to each other. An upper end of the transition tank is provided with a first through hole, and a lower end of the transition tank is hole-through. The transition plate is provided with a second through hole. The conductive rod extends through the first through hole and the second through hole. The transition tank and the transition plate are fixedly connected such that an accommodation cavity is formed around the conductive rod and in the transition tank.