Waterproof Blower Venting for Motor Cooling in Rain
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Solution Overview
Problem
Existing blowers struggle to balance waterproof performance and heat dissipation, leading to issues such as electrical leakage or motor burnout when exposed to rainy conditions.
Innovation Solution
A blower design with a volute casing and motor housing that incorporates water-blocking convex ribs, ventilation areas, drainage holes, and grilles to prevent rainwater ingress while allowing effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional blowers are designed with open ventilation structures for heat dissipation, then heat dissipation performance is improved, but waterproof performance deteriorates allowing rainwater to enter the motor
Solution Approach 1:
The patent employs water-blocking grilles with porous-like structures that allow air to pass through for heat dissipation while blocking rainwater. The grille design creates a selective permeability effect where air molecules can pass but water droplets are blocked, resolving the contradiction between heat dissipation and waterproofing.
Solution Approach 2:
The patent introduces water-blocking convex ribs and water-blocking grilles as intermediary elements between the motor and the external environment. These intermediaries facilitate heat dissipation by allowing air flow while preventing direct water contact with the motor, thus mediating between thermal management requirements and waterproofing needs.
2Reliability
If the motor is fully enclosed to prevent water ingress, then waterproof performance is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent applies local quality by creating different structural characteristics at different locations and orientations of the ventilation area. Water-blocking convex ribs are positioned to block rainwater from specific angles, while water-blocking grilles are placed at critical entry points. This localized protection maintains overall enclosure integrity while permitting controlled air flow for heat dissipation.
Solution Approach 2:
The patent addresses the two-dimensional conflict between enclosure and ventilation by introducing a third dimensional element - the water-blocking convex ribs extend outward to create a protective overhang structure. This adds a spatial dimension that blocks water from above while allowing air to flow horizontally, thus resolving the contradiction through dimensional differentiation.
3Temperature
If ventilation area is increased for better heat dissipation, then heat dissipation performance is improved, but risk of water ingress increases
Solution Approach 1:
The water-blocking grilles function as porous structures that permit air molecules to pass through while blocking larger water droplets. By covering the increased ventilation area with these selective barriers, the patent maintains large open areas for heat dissipation while protecting against water ingress through the porous-like filtering effect.
Solution Approach 2:
The water-blocking grilles and convex ribs serve as intermediary protective layers that cover the expanded ventilation area. These intermediaries allow the ventilation area to be increased for heat dissipation while the intermediaries themselves block water from reaching the motor, thus enabling larger opening without proportionally increasing water ingress risk.
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
Ensures both excellent waterproof performance and heat dissipation, preventing accidents like electrical leakage or motor burnout during rainy outdoor use.
Implementation Method 1
a water-blocking convex rib being provided on the periphery of the ventilation area... serves to block the rainwater entering the ventilation area
Implementation Method 2
a drainage hole in communication with the outside is provided at the bottom of the mounting cavity... rainwater that enters the mounting cavity can be drained out through the drainage hole
Implementation Method 3
a water-blocking cover is provided at the rear vent... water-blocking grille... block the rainwater from directly entering the mounting cavity through the rear vent
Implementation Method 4
the ventilation area... allows air to flow from the ventilation area into a mounting cavity to facilitate heat dissipation for the motor
Data Source
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AI summary
A blower with a waterproof function includes a volute casing having a first housing, a second housing, and a volute cavity defined within the volute casing between the first housing and the second housing, an impeller disposed within the volute cavity, and a motor driving the rotation of the impeller, the motor including an output shaft. A sidewall of the second housing of the volute casing further includes a ventilation area disposed adjacent to the motor, the output shaft of the motor passes through the ventilation area and is connected to the impeller, and a waterblocking rib is disposed on a periphery of the ventilation area.