Explosion-Proof Wiring Seal Structure for Thermal Stress Relief
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Solution Overview
Problem
Existing explosion-proof structures face issues with thermal stress due to differences in linear expansion coefficients between the inner peripheral wall surface, filler, and wiring, leading to reduced adhesive force and potential separation, especially under temperature changes.
Innovation Solution
Incorporating a partition wall with a filling portion that includes a first and second peripheral groove filled with a filler, allowing for axial expansion and contraction, and providing an axial gap between the through substrate and internal fixing member to absorb thermal stress, thereby enhancing the seal and durability against explosion pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single peripheral groove filled with filler is used to seal the gap between the inner peripheral wall surface and the wiring, then the structure is simple, but thermal stress from linear expansion coefficient differences causes reduced adhesive force and potential separation
Solution Approach 1:
The single peripheral groove is divided into multiple peripheral grooves (first peripheral groove and second peripheral groove) filled with filler. This segmentation distributes the thermal stress across multiple sealing points, preventing concentration of stress at a single location and maintaining adhesive force under temperature variations.
Solution Approach 2:
The filler material is strategically placed in specific peripheral grooves at different locations around the opening. This creates localized sealing zones that independently handle thermal expansion stresses, with each groove-filler interface providing localized adhesion that collectively enhances overall seal reliability.
2Stability of the object's composition
If the through substrate is rigidly fixed to the internal fixing member, then structural stability is improved, but thermal expansion and contraction causes stress accumulation and potential separation
Solution Approach 1:
The connection between the through substrate and internal fixing member is changed from rigid fixation to a dynamic, movable connection. The axial gap allows the substrate to move axially relative to the fixing member, accommodating thermal expansion and contraction dynamically without generating excessive stress that would compromise the seal.
Solution Approach 2:
The axial gap acts as an intermediary element between the through substrate and internal fixing member. This gap provides a buffer zone that absorbs thermal stress through controlled movement, preventing direct stress transmission that would otherwise cause separation at the filler interfaces.
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 suppresses separation between the filler and the inner peripheral wall surface, improving the seal and durability of the filling portion by resisting thermal stress and explosion pressure, while simplifying the structure and reducing the need for special sealing materials.
Implementation Method 1
an axial gap is provided between the through substrate and the internal fixing member to allow the substrate and the internal fixing member to approach each other closely in an axial direction along the central axis in order to absorb expansion and contraction in the axial direction, produced along the entire substrate and internal fixing member due to heat
Implementation Method 2
a filler that seals a gap between the inner peripheral wall surface and the wiring
Implementation Method 3
a first peripheral groove provided on the inner peripheral wall surface and filled with the filler, and a second peripheral groove provided on the inner peripheral wall surface and filled with the filler
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An explosion-proof structure includes a partition wall that partitions a sealed space in a container and wiring that connects the interior and the exterior of the sealed space. The partition wall includes a filling portion through which the wiring passes. The filling portion includes an inner peripheral wall surface that defines an opening having a central axis that passes through the partition wall, a filler that seals a gap between the inner peripheral wall surface and the wiring, a first peripheral groove provided on the inner peripheral wall surface and filled with the filler, and a second peripheral groove provided on the inner peripheral wall surface and filled with the filler. This explosion-proof structure is capable of improving the seal of the filling portion.