Fuse Cavity Projecting Portion Prevents Housing Adhesion
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Solution Overview
Problem
Conventional electric connection boxes face difficulties in removing fuses whose housings are damaged by heat radiation or melting, as the lower face of the housing adheres to the inner bottom face of the fuse cavity, making it hard to withdraw the fuse.
Innovation Solution
The electric connection box features a fuse cavity with a projecting portion on its inner bottom face that creates a gap between the housing and the cavity, preventing the damaged housing from adhering to the inner bottom, allowing easy removal of the fuse even when the housing is fusedly damaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the housing of the fuse is made to fit closely against the inner bottom face of the fuse cavity for stable positioning, then the positioning stability is improved, but the housing adheres to the inner bottom face when fusedly damaged, making removal difficult
Solution Approach 1:
The inner bottom face of the fuse cavity is segmented into multiple regions: a central recessed portion and surrounding projecting portions. This segmentation creates distinct functional zones where the recessed portion allows gap formation for easy removal while the projecting portions provide stable positioning, thus resolving the contradiction between stability and ease of removal.
Solution Approach 2:
Different regions of the inner bottom face are given different local qualities: the central recessed portion has a lower height to create a gap, while the surrounding projecting portions have a higher height to provide stable positioning. This local differentiation allows the housing to be both stable during operation and easily removable when damaged.
2Device complexity
If the fuse cavity is designed without a projecting portion to maintain simplicity, then the device complexity is reduced, but the housing adheres to the inner bottom face when fusedly damaged, increasing removal difficulty
Solution Approach 1:
The inner bottom face is segmented into a central recessed portion and surrounding projecting portions, creating a simple yet effective structure that prevents adhesion while maintaining ease of manufacture and structural clarity.
Solution Approach 2:
The solution introduces a height dimension variation on the inner bottom face by creating a recessed portion, transforming a two-dimensional flat surface into a three-dimensional structured surface. This dimensional change enables gap formation without adding complex external components.
3Stability of the object's composition
If the housing fits closely against the inner bottom face for stable positioning, then the positioning stability is improved, but the area of adhesion increases when fusedly damaged, making removal more difficult
Solution Approach 1:
The inner bottom face is segmented into a central recessed portion and surrounding projecting portions, creating distinct functional zones. The recessed portion reduces adhesion area by forming a gap, while the projecting portions maintain positioning stability through lateral contact.
Solution Approach 2:
Different regions of the housing bottom are given different local qualities: the central region forms a gap with the recessed portion to minimize adhesion area, while the peripheral regions contact the projecting portions for stable positioning, thus resolving the contradiction between stability and adhesion area.
Data Source
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AI summary
There is provided an electric connection box in which even when a housing of a fuse is fusedly damaged by heat radiation or melting of a fusible element of the fuse, the fusedly-damaged housing can be restrained from adhering to an inner bottom portion of a fuse cavity. The inner bottom portion (11a) of the fuse cavity has a projecting portion (16) formed on an inner bottom face thereof and extending upwardly from the inner bottom face, and an upper face (16c, 16d) of the projecting portion (16) abuts against a lower face (21b) of the housing (21) of the fuse (2), and a gap (15e) is formed between the inner bottom face and the lower face (21b) of the housing (21) because of the projecting portion (16).