Waterproof Blower Vent Structure for Motor Cooling
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Solution Overview
Problem
Existing blowers struggle to balance waterproof performance and heat dissipation, leading to potential electrical leakage or motor burnout during rainy conditions due to water ingress.
Innovation Solution
A blower design with a volute casing, impeller, and motor, featuring a ventilation area with a water-blocking convex rib, drainage hole, and multiple water-blocking grilles and covers to prevent rainwater entry while allowing effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional blowers are designed with open ventilation areas for heat dissipation, then heat dissipation performance is improved, but waterproof performance deteriorates allowing rainwater to enter the motor
Solution Approach 1:
The ventilation area is segmented into multiple independent air inlets (first air inlet, second air inlet, third air inlet) distributed at different positions and orientations. This segmentation allows air to approach from multiple directions for effective heat dissipation while each inlet can be independently protected by water-blocking structures
Solution Approach 2:
Different regions of the housing are assigned different functional qualities: the first air inlet area has strong water-blocking requirements (protected by convex ribs and grilles), while the second and third air inlets have varying protection levels based on their exposure to rain. The drainage hole is strategically positioned at the lowest point for optimal water evacuation
2Reliability
If waterproof structures like grilles and covers are added to prevent rainwater entry, then waterproof performance is improved, but heat dissipation efficiency deteriorates due to blocked airflow
Solution Approach 1:
Water-blocking grilles with porous or mesh structures are installed at the air inlets. These grilles have sufficient open area to allow air flow for heat dissipation while their pore structure blocks rainwater from penetrating into the motor housing
Solution Approach 2:
The water-blocking convex ribs extend outward from the housing surface into the third dimension, creating an overhang structure that deflects rainwater away from the air inlets before water can block the airflow path, thus maintaining heat dissipation efficiency while achieving waterproof protection
3Reliability
If the motor housing is completely sealed to prevent water entry, then waterproof performance is improved, but heat dissipation capability deteriorates due to lack of ventilation
Solution Approach 1:
A drainage hole is provided as an intermediary structure that allows the housing to be relatively sealed against rainwater while still managing water that enters. The drainage hole acts as a controlled opening that evacuates water through gravity flow, maintaining the sealed structure's protective function while preventing water accumulation that would harm the motor
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 design ensures both excellent waterproof performance and heat dissipation, preventing accidents like electrical leakage or motor burnout by effectively blocking rainwater from entering the motor.
Implementation Method 1
a water-blocking convex rib being provided on the periphery of the ventilation area
Implementation Method 2
a drainage hole in communication with the outside is provided at the bottom of the mounting cavity
Implementation Method 3
a drainage hole in communication with the outside is provided at the bottom of the mounting cavity
Implementation Method 4
a water-blocking cover is provided at the rear vent
Implementation Method 5
a first water-blocking grille is provided at the rear vent
Data Source
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 water-blocking rib is disposed on a periphery of the ventilation area.