Electric Junction Box Inner Wall Water Drainage
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Solution Overview
Problem
Conventional electric junction boxes in automobiles allow water to infiltrate and adhere to the printed wiring board when the upper and lower covers are stacked orthogonally, due to the design of through holes for locking, leading to potential electrical issues.
Innovation Solution
The electric junction box design includes a locking part on the lower cover and a lock receiving part on the upper cover, with an inner wall inside the lower cover that directs infiltrating water downward, preventing it from reaching the printed wiring board, and features a through hole in the lower cover to drain water effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the upper cover and lower cover are stacked orthogonally with through holes for locking, then the covers can be securely attached together, but water infiltrates through the through holes and adheres to the printed wiring board
Solution Approach 1:
An inner wall is introduced as an intermediary structure between the through hole and the printed wiring board. This inner wall acts as a mediator that intercepts infiltrating water and redirects it, preventing direct contact with the printed wiring board while maintaining the through hole's locking function
Solution Approach 2:
The design converts the harmful effect of water infiltration through the through hole into a beneficial drainage path. The inner wall guides water along a controlled path that leads to a drainage hole, transforming the potential damage into a safe discharge mechanism
2Ease of manufacture
If the through hole opens upwardly for locking part formation, then the locking mechanism can be formed, but water and fluid infiltrate into the main body through the through hole
Solution Approach 1:
The inner wall serves as an intermediary barrier that intercepts fluid entering through the upward-opening through hole. It redirects the fluid flow away from the printed wiring board and toward the drainage hole, maintaining the ease of locking part formation while preventing harmful fluid infiltration
Solution Approach 2:
The solution adds a vertical dimension to fluid control by introducing the inner wall that extends downward. This creates a three-dimensional fluid guidance path that redirects water from a direct downward trajectory to a controlled path along the inner wall surface to the drainage hole
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 design effectively prevents water from adhering to the printed wiring board by directing it away from the board and draining it, ensuring the electrical components remain dry and functional even when the covers are stacked orthogonally.
Implementation Method 1
a lower end of the inner wall of the upper cover is disposed below the printed wiring board
Implementation Method 2
features a through hole in the lower cover to drain water effectively
Data Source
AI summary
An electric junction box to prevent fluid such as water infiltrating inside the covers from adhering to a printed wiring board even if the upper cover and lower cover are stacked to each other in an orthogonal direction, comprises a metal board, the surface being arranged in a horizontal direction, and a main body accommodating the metal board. The main body includes an upper cover and a lower cover to be stacked to each other in a direction orthogonal to a surface of the metal board. On a side wall of the lower cover a locking projection is disposed. On a side wall of the upper cover a locking step is disposed with which the locking projection is locked. The upper cover includes an inner wall disposed inside the side wall of the lower cover, the lower end being disposed below the metal board.