Electrical Connection Box Drain Hole for Liquid Discharge
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Solution Overview
Problem
Conventional electrical connection boxes in vehicles are prone to water ingress through gaps between wires and the housing, which can lead to damage from liquid entry, compromising the durability of electronic components and wires.
Innovation Solution
The electrical connection box incorporates a housing with a wire outlet and a wire routing space featuring a drain hole on the inner wall surface, designed to discharge liquid entering through the wire outlet to the outside, enhancing water resistance by directing liquid away from the accommodation chamber and electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wires are drawn out from the housing through a wire outlet, then electrical connection functionality is achieved, but gaps form between wires and wire outlet allowing liquid entry
Solution Approach 1:
A wire routing space is introduced as an intermediary chamber between the accommodation chamber and the external environment. This space allows wires to be drawn out while providing a controlled transition zone where liquid can be discharged through drain holes before reaching the wires or accommodation chamber.
Solution Approach 2:
The harmful liquid is extracted from the potential contamination path by providing drain holes that actively remove liquid from the wire routing space before it can reach the wires or electronic components in the accommodation chamber.
2Reliability
If the housing is sealed to prevent liquid entry, then water resistance is improved, but wire routing and electrical connection become difficult
Solution Approach 1:
The housing is segmented into functional zones: the accommodation chamber for electronic components, the wire routing space for wire passage, and the wire outlet for external connection. The drain holes are specifically positioned in the wire routing space to discharge liquid before it reaches critical areas, maintaining water resistance while enabling wire routing.
3Object-affected harmful factors
If drain holes are added to the housing wall, then liquid discharge capability is improved, but housing structural integrity may be compromised
Solution Approach 1:
Drain holes are strategically positioned in the wire routing space rather than uniformly distributed throughout the housing. This localized approach provides liquid discharge capability exactly where needed (in the wire routing space) while minimizing the impact on overall housing structural integrity.
Data Source
AI summary
An electrical connection box includes a housing, and at least one electronic component accommodated in the housing. The housing includes an accommodation chamber that accommodates the electronic component, a wire outlet that draws out a wire electrically connected to the electronic component from the housing, and a wire routing space that guides the wire drawn out from the accommodation chamber to the wire outlet. A wall forming an outer wall of the housing includes a drain hole, or a through hole, which communicates the wire routing space and an outer side of the housing and which discharges liquid entering through the wire outlet to the outer side of the housing. The drain hole is formed in a first contact area of an inner wall surface of the wire routing space, toward which the liquid entering the wire routing space through the wire outlet heads first.