Casing Structure with Inclined Vent for Droplet Guidance
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Solution Overview
Problem
In electronic equipment used in numerical control devices, moisture and cutting oil mist accumulates on fan motors and drips onto control boards, causing shorting and component failure, as existing solutions like inclining the fan motor do not effectively guide water and oil droplets away from sensitive components.
Innovation Solution
The casing structure features an inclined vent hole on the upper wall with a specific profile line that guides condensed water and oil droplets to a safe area, preventing them from adhering to control boards and electronic components, using a combination of continuous and stepwise thickness changes and protruding ribs to direct droplets away from internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fan motor is simply inclined and attached to the casing, then water droplets and oil droplets can be guided to some extent, but depending on the shape of the fan motor, oil and the like adhered to the housing do not always drop in one direction, reducing reliability
Solution Approach 1:
The invention divides the droplet guidance function into two independent parts: the fan motor housing (which condenses droplets) and the casing structure (which guides droplets). By segmenting the system, the guidance function is transferred to the casing's inclined surface and vent hole configuration, ensuring reliable droplet direction regardless of fan motor housing shape variations.
Solution Approach 2:
The inclined surface and vent hole configuration act as an intermediary structure between the fan motor housing and the internal electronic components. This intermediary guides droplets away from sensitive areas through its specific geometry, providing reliable droplet management independent of the fan motor's internal structure.
2Temperature
If the fan motor is operated to cool electronic components, then cooling effectiveness is improved, but water droplets and oil droplets do not drop vertically due to air flow and adhere to control boards, causing shorting and failure
Solution Approach 1:
The invention converts the harmful effect of air flow (which carries droplets toward control boards) into a beneficial guidance mechanism. The inclined surface and strategically positioned vent hole use the same air flow to actively direct droplets toward safe discharge paths, transforming the problem into a solution.
Solution Approach 2:
Instead of relying solely on vertical gravity-driven droplet fall, the invention introduces a horizontal dimension through the inclined surface and vent hole positioning. This creates a two-dimensional droplet guidance path that combines gravitational force with air flow direction, ensuring droplets are directed away from control boards even during fan operation.
3Reliability
If moisture and cutting oil mist accumulate on the fan motor housing, then condensation occurs forming water and oil droplets, but these droplets fall randomly and adhere to electronic components, causing shorting
Solution Approach 1:
The invention applies local quality by creating a specific inclined surface geometry and vent hole configuration in the critical area where droplets are generated and discharged. This localized structural feature ensures that droplets form and discharge in a controlled manner, preventing random fall patterns that would threaten electronic components.
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 configuration reliably directs water and oil droplets to a safe location, preventing adhesion to control boards and electronic components, thereby reducing the risk of shorting and extending the life of electronic components.
Implementation Method 1
the inner wall surface of the upper wall of the casing in which the vent hole is formed is formed into a inclined surface in which one side wall of the casing is lowered and the other side wall or an opening across therefrom is raised
Implementation Method 2
moisture, cutting oil and the like contained in the air inside the factory accumulates in the form of mist on the casing of the fan motor. When placing the fan motor at an upper section of the electronic equipment, the moisture and oil accumulated on the casing of the fan motor drip down in the form of water droplets and oil droplets
Implementation Method 3
a profile line of the vent hole on the inclined surface is not raised in mid-course but only descends at least between a point of the highest position thereof and a point in which the profile line intersects with a line which passes through substantially the center of the vent hole
Data Source
AI summary
A fan motor is mounted on the upper wall of the casing. The lower surface of this upper wall is formed into an inclined surface in which inclination is formed from the front wall side of the casing toward a back wall across from the front wall. When the fan motor is driven, oil mist or moisture contained in the air are condensed into water droplets or oil droplets. These water droplets or oil droplets fall and flow to the inner wall surface of the upper wall of the casing along the inner peripheral wall of a vent hole. Then the water droplets or oil droplets flow along the profile line of a vent hole smoothly (without stopping) and roll down the side wall of the casing.