Heat Dissipating Fan with Reverse Rotation Dust Removal
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Solution Overview
Problem
Conventional heat dissipating fans suffer from dust accumulation, which reduces air output and requires manual cleaning, affecting their heat dissipating efficiency and longevity.
Innovation Solution
A heat dissipating fan design with a housing featuring an air inlet, air outlet, and dust channel, where an impeller can rotate in reverse to expel accumulated dust through a dedicated dust channel, ensuring automatic dust removal without interfering with the heat dissipating function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan operates continuously to dissipate heat, then heat dissipation efficiency is improved, but dust accumulates inside the housing reducing air output
Solution Approach 1:
The fan motor reverses rotation direction periodically to create dust removal airflow. The control circuit enables the motor to rotate in reverse direction for a predetermined time interval, generating airflow that flows from the dust discharge port outward to remove accumulated dust, then returns to normal rotation for heat dissipation. This periodic reversal resolves the contradiction by maintaining heat dissipation efficiency while preventing dust accumulation that would reduce air output.
Solution Approach 2:
The fan motor rotates in reverse direction to generate airflow opposite to the normal heat dissipation direction. This reverse rotation creates negative pressure at the dust discharge port and positive pressure at the air inlet, causing airflow to flow from the dust discharge port outward to remove accumulated dust. This inversion of rotation direction enables dust removal without compromising the primary heat dissipation function.
2Strength
If the fan housing is sealed to improve structural integrity, then housing strength is improved, but dust accumulates inside the housing
Solution Approach 1:
The invention extracts the dust removal function from the sealed housing structure by providing a dedicated dust discharge port and reverse rotation mechanism. The dust discharge port is positioned at the bottom of the housing to facilitate dust removal, while the reverse rotation of the fan motor creates airflow that flows from this port outward. This extraction allows the housing to remain sealed for structural integrity while providing a specific pathway for dust egress.
Solution Approach 2:
The fan system performs self-cleaning by utilizing its own motor and airflow generation capability. The control circuit automatically initiates reverse rotation at predetermined time intervals, causing the fan to generate airflow that removes accumulated dust from the housing interior through the dust discharge port. This self-service mechanism eliminates the need for external cleaning while maintaining the sealed housing structure.
3Quantity of substance
If manual cleaning is performed to remove dust, then dust accumulation is reduced, but maintenance time and complexity increase
Solution Approach 1:
The fan system automatically removes dust by utilizing its own motor and airflow generation capability. The control circuit automatically initiates reverse rotation at predetermined time intervals, causing the fan to generate airflow that removes accumulated dust from the housing interior through the dust discharge port. This self-service mechanism eliminates the need for external cleaning while maintaining the sealed housing structure.
Solution Approach 2:
The control circuit is configured to automatically control the motor to rotate in reverse direction at predetermined time intervals for a predetermined time period. This periodic automatic dust removal eliminates the need for manual cleaning intervention, significantly reducing maintenance time and effort while effectively preventing dust accumulation that would compromise air output.
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 automatic dust removal enhances air input and output, maintaining the heat dissipating effect and prolonging the service life of electronic products by preventing dust accumulation.
Implementation Method 1
the control circuit is configured to automatically control the motor to rotate in a reverse direction... causing the fan to generate an airflow that flows from the dust discharge port outward
Data Source
AI summary
A heat dissipating fan includes a housing having a base and a sidewall coupled to the base. The sidewall defines a compartment. The housing includes an air inlet, an air outlet and a dust channel. The air outlet includes opposite first and second end edges located at a same straight side of the housing. The housing defines a first plane. The impeller includes a hub and several blades. The impeller defines a second plane. The compartment of the housing includes an air outlet section and a pressure accumulating section. The air outlet section is located between the first and second planes. The air outlet is located in the air outlet section. The dust channel extends in an angle with respect to the second plane. An impeller is coupled to the stator that is coupled to the base. A control element includes a driving circuit and a rotating direction control circuit.