Vacuum Interrupter Bellows Support Member
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Solution Overview
Problem
Conventional vacuum interrupters face issues with enlargement and buckling of bellows due to increased outer diameter or placement outside the vacuum vessel, which compromises the airtightness and structural integrity.
Innovation Solution
A bellows support member is fixed inside the vacuum vessel to contact the accordion portion of the bellows, preventing deformation and size increase by absorbing vibration energy through friction, thus maintaining airtightness and extending the bellows' lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer diameter of the bellows is increased to prevent buckling, then the buckling resistance is improved, but the overall vacuum interrupter size is enlarged
Solution Approach 1:
A support member is introduced as an intermediary element between the bellows and the vacuum interrupter structure. This support member provides mechanical reinforcement to prevent bellows buckling during operation, while being compact enough to avoid significant increase in the overall device size. The support member acts as a mediator that transfers and distributes mechanical loads, allowing the bellows to maintain its function without requiring increased diameter.
2Strength
If the bellows is placed outside the vacuum vessel to prevent buckling, then the buckling resistance is improved, but the airtightness is compromised
Solution Approach 1:
The support member serves as an intermediary that enables the bellows to remain inside the vacuum vessel while still preventing buckling. By providing internal mechanical support, the bellows can maintain its structural integrity within the vacuum environment, preserving both the airtight seal and the anti-buckling function simultaneously.
Solution Approach 2:
The support member is nested within the vacuum vessel structure, providing reinforcement to the bellows without extending the bellows outside the vacuum boundary. This nested configuration allows the support function to be integrated within the existing vacuum-tight structure, maintaining airtightness while preventing buckling.
3Stability of the object's composition
If the bellows is restrained at both ends to maintain position, then the positional stability is improved, but the buckling occurs due to pressure differential
Solution Approach 1:
The support member acts as an intermediary structural element that redistributes the mechanical stresses caused by the pressure differential between the inside and outside of the bellows. By providing additional support along the bellows length, it prevents the buckling that would otherwise occur despite proper end restraints, maintaining both positional stability and structural integrity.
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 effectively prevents the enlargement and buckling of the bellows, maintaining the vacuum interrupter's airtightness and extending its operational life by absorbing vibration energy and reducing stress on the bellows.
Implementation Method 1
absorbing vibration energy through friction
Data Source
AI summary
A vacuum interrupter includes a vacuum vessel configured with an insulator, a fixed end plate and a movable end plate fixed to both ends of the insulator. A fixed contact and a movable contact face each other inside the vacuum vessel. A movable conductor has one end fixed to the movable contact and the other end is extracted outside the vacuum vessel. A bellows has an accordion portion expanding and contracting with linear movement of the movable conductor. A bellows support member having a cylindrical shape is fixed to the vacuum vessel so that the accordion portion of the bellows contacts the inside of the bellows support member.