Hermetic Terminal Pipe Lead Structure for Thermal Expansion Relief
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Solution Overview
Problem
Conventional hermetic terminals in high-capacitance relays face issues with airtightness due to insufficient gap between the terminal base and pipe lead, leading to deformation and potential damage to insulating materials during thermal expansion.
Innovation Solution
Incorporating a fragile portion in the pipe lead with lower rigidity or proof stress than the main portion to absorb and contain deformation, preventing stress propagation to the connecting portion and insulating material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between the terminal base and pipe lead is reduced to improve airtightness, then the airtightness is improved, but the pipe lead cannot absorb thermal expansion and may deform
Solution Approach 1:
The pipe lead is divided into a rigid main portion and a fragile portion with different mechanical properties. The fragile portion has lower rigidity and is designed to deform preferentially, absorbing thermal expansion stress while the rigid main portion maintains structural integrity and airtightness.
Solution Approach 2:
Different portions of the pipe lead are given different local qualities: the main portion maintains high rigidity for structural support and airtightness, while the fragile portion has reduced rigidity to serve as a stress absorption zone during thermal expansion.
2Strength
If the pipe lead is made more rigid to prevent deformation, then the deformation resistance is improved, but the stress propagates to the insulating material and connecting portion
Solution Approach 1:
The fragile portion acts as an intermediary element between the rigid main portion and the terminal base. It mediates the thermal expansion stress by deforming in a controlled manner, preventing stress propagation to the insulating material and connecting portion.
Solution Approach 2:
The fragile portion is designed in advance as a stress absorption zone that will deform during thermal expansion, providing beforehand cushioning against stress propagation to critical components like the insulating material and connecting portion.
3Reliability
If the fragile portion is designed with lower rigidity to absorb stress, then the stress absorption is improved, but the overall structural strength is reduced
Solution Approach 1:
The pipe lead is segmented into functional zones: the fragile portion for stress absorption and the rigid main portion for maintaining overall structural strength. This segmentation allows each portion to optimize its local function without compromising the global structure.
Solution Approach 2:
The fragile portion is designed with locally reduced rigidity specifically where stress absorption is needed, while the main portion maintains high rigidity to preserve overall structural strength. The local quality change is confined to the fragile portion only.
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 airtightness and protects critical components by limiting deformation to a specific range, ensuring reliable operation under thermal expansion.
Implementation Method 1
the pipe lead has a main portion and a fragile portion that relieves external stress
Implementation Method 2
when a gap between the terminal base and the pipe lead is insufficient, the pipe lead cannot absorb expansion and contraction of the terminal base
Data Source
AI summary
A contact device according to the present disclosure includes: a metal container having a through hole and an opening; a pipe lead inserted into the through hole; an insulating material that seals the metal container and the pipe lead; and a terminal base made of a low-resistance metal, the terminal base penetrating the pipe lead and being fixed to the pipe lead. The pipe lead has a fragile portion that relieves external stress.