Electrical Junction Box Waterproofing via Spherical Deflection
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Solution Overview
Problem
Conventional electrical junction boxes with water draining holes are prone to water infiltration due to water bouncing against the waterproof walls inside the holes, which are not effectively prevented from entering the box.
Innovation Solution
The electrical junction box incorporates a spherical cover wall part inside the water draining hole to deflect incoming water, a cylindrical peripheral draining protrusion to guide water outwards, and a downwardly protruding portion at the draining opening to prevent water from entering, along with a curved surface that discourages water from staying around the protrusion, ensuring effective drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waterproof walls are provided inside the water draining hole along the periphery, then water infiltration is prevented, but water bounces against the waterproof walls and infiltrates into the junction box
Solution Approach 1:
The patent applies spheroidality by forming the waterproof wall with a spherical cover wall part that has a curved inner spherical surface facing the water draining hole. This curved surface causes incoming water to bounce back towards the hole rather than infiltrating along the periphery, effectively resolving the water bouncing problem while maintaining waterproof performance
Solution Approach 2:
The patent converts the harmful effect of water bouncing against the waterproof wall into a beneficial effect by designing the spherical cover wall part to redirect the bouncing water back through the water draining hole. The water that would normally infiltrate along the periphery is now guided to drain outside the junction box
2Productivity
If a water draining hole is formed on the bottom wall part, then water drainage is enabled, but water infiltration into the box body occurs
Solution Approach 1:
The spherical cover wall part with its curved inner spherical surface redirects incoming water back through the draining hole, enabling effective drainage while preventing infiltration
Solution Approach 2:
The patent adds a dimensional element by protruding the spherical cover wall part towards the inside of the box body from the periphery of the water draining hole. This creates a three-dimensional barrier that redirects water flow in multiple directions, preventing infiltration while maintaining drainage functionality
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
The configuration effectively prevents water from infiltrating into the junction box by bouncing it back or guiding it outwards, ensuring that water inside the box is smoothly drained through the water draining hole, thus maintaining the electrical components' dryness.
Implementation Method 1
pressurized water infiltrating into the water draining hole from the outside bounces back against the spherical surface towards the water draining hole
Implementation Method 2
a peripheral draining protrusion having a shape of a cylinder protruding from an outer surface of the box body along the periphery of the water draining hole and serving as a draining passage
Data Source
AI summary
An electrical junction box includes a box body in which electrical parts are mounted and that has a water draining hole provided at a bottom wall part of the box body and a waterproof wall that is provided inside the box body along a periphery of an opening of the water draining hole. The waterproof wall includes a spherical cover wall part standing from the periphery of the water draining hole to cover the water draining hole with an inner spherical surface, and a draining opening part formed at a portion of the spherical cover wall part to allow water exist in the box body to drain to the outside of the box body through the water draining hole.