Waterproof Control Apparatus Filter Mounting and Ventilation
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Solution Overview
Problem
Conventional waterproof control apparatuses face challenges in mounting water-repellent filters, including reduced ventilation area due to small filter size, difficulty in fixing filters on sheet metal or aluminum die-casting bases, and complications in high-pressure washing scenarios, which hinder functional testing and mounting flexibility.
Innovation Solution
A waterproof type control apparatus with a water-repellent filter mounted on the inner surface of the connector housing, featuring a flat porous material with fine pores, and a poured water blocking wall that partially or fully blocks water flow, allowing atmospheric air passage while preventing direct water wetting, enabling flexible mounting and functional testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the water-repellent filter is provided at the cover side, then the ventilation structure can be implemented, but the structure becomes complicated and expensive due to direct water wetting
Solution Approach 1:
The water-repellent filter is extracted from the cover and relocated to the connector housing, which is positioned away from direct water exposure areas. This extraction eliminates the need for complex water-resistant mounting structures on the cover while maintaining the ventilation function.
2Object-affected harmful factors
If the water-repellent filter is provided at the back surface of the base, then it is hard to be wetted directly with water, but it is difficult to bond and fix the filter on sheet metal or aluminum die casting bases
Solution Approach 1:
The water-repellent filter is extracted from the base and relocated to the connector housing. This avoids the bonding difficulty on metal bases while maintaining protection from direct water wetting, as the connector housing is naturally positioned away from high-pressure water exposure.
3Ease of manufacture
If the base is made of resin and heat welding is used to fix the water-repellent filter, then the filter can be fixed easily, but heat generated within the casing cannot be transmitted and dissipated
Solution Approach 1:
The water-repellent filter is extracted from the base and moved to the connector housing. This eliminates the need for heat welding on the base, preserving the base's heat dissipation function while still achieving easy filter fixation on the resin connector housing through alternative methods.
4Device complexity
If a small water-repellent filter is used in the connector housing, then the mounting structure is simplified, but the ventilation area is reduced causing air pressure difference
Solution Approach 1:
The connector housing is designed with a multi-dimensional ventilation structure including side ventilation holes and an upper ventilation hole. This three-dimensional arrangement increases the total ventilation area while maintaining a compact filter size and simple mounting structure.
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 solution increases the water-repellent filter area to reduce air pressure differences, simplifies and cost-reduces the mounting structure, and allows for the use of resin or sheet metal covers, while preventing direct water wetting across various mounting angles and positions.
Implementation Method 1
a water-repellent filter which is a flat porous material including a plurality of fine pores which block entry and passing of water droplets into the casing and allow the atmospheric air to freely pass therethrough
Implementation Method 2
a poured water blocking wall which partially or fully blocks either one of poured water in a first direction flowing from a cover side plane to a base side plane or poured water in a second direction flowing from the base side plane to the cover side plane
Implementation Method 3
circuit components, including a heating component, and an external wiring connector housing exposed partially from the casing are mounted on the circuit board
Data Source
AI summary
A circuit board is sealed and housed in a casing including a base and a cover, a connector housing including a partition wall is mounted on the circuit board, and an electrical connection between the interior and the exterior of the casing is established. A water-repellent filter is fixed to an inner surface of the partition wall, an outer surface portion of the water-repellent filter is opened to atmosphere via the breath ventilation hole, and an atmospheric opening surface thereof is formed such that the atmospheric opening surface being wetted directly with water is avoided by a poured water blocking wall and water barrier walls. A position where the poured water blocking wall is provided is changed by an insert mold in response to the direction of the mounting surface of the base.