Fan Duct Airflow Path for Heat Sink Dust Removal
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Solution Overview
Problem
Conventional heat-dissipating units in electronic devices face increased cost and weight due to the need for additional components and complex structures to remove dust from heat-dissipating components, which impairs cooling efficiency.
Innovation Solution
A simplified structure incorporating a communicating path between the fan's air outlet and the heat-dissipating component's inflow surface, with a duct acting as an airflow path to remove dust by reversing airflow direction, eliminating the need for additional components like brushes or motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush and motor are added to remove dust from the heat-dissipating component, then dust removal capability is improved, but device complexity and cost increase
Solution Approach 1:
The system uses the fan's own airflow to remove dust from the heat-dissipating component. By directing airflow through the communicating path formed by the gap between the fan air outlet and the heat-dissipating component surface, the fan performs dual functions: cooling the component and cleaning its surface, eliminating the need for separate brush and motor mechanisms
Solution Approach 2:
The fan is designed to perform multiple functions simultaneously: it provides cooling airflow to the heat-dissipating component and also serves as a dust removal device. The communicating path allows the same airflow to achieve both heat exchange and dust removal, reducing the overall component count and structural complexity
2Reliability
If a brush and motor are added to remove dust from the heat-dissipating component, then dust removal capability is improved, but device weight increases
Solution Approach 1:
The fan performs dual functions of cooling and dust removal without requiring additional heavy components. The communicating path enables the fan's airflow to clean the heat-dissipating component surface, eliminating the need for heavy brush and motor assemblies while maintaining effective dust removal capability
Solution Approach 2:
The dust removal function is extracted from a separate mechanical system (brush and motor) and integrated into the existing fan system. By utilizing the fan's airflow through the communicating path, the dust removal capability is achieved without adding external heavy components
3Temperature
If fins are arrayed at narrow spacing to increase surface area, then heat-dissipating effect is improved, but dust accumulation problem worsens
Solution Approach 1:
The system uses its own cooling airflow to simultaneously clean the fins. The communicating path directs airflow through the narrow gaps between fins, which not only cools the component but also prevents dust accumulation in these critical heat exchange areas, maintaining thermal performance over time
Solution Approach 2:
The narrow fin spacing, which creates dust accumulation problems, is converted into a benefit by using the same narrow gaps as airflow passages for dust removal. The cooling airflow passing through these gaps simultaneously performs heat exchange and dust clearance functions
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 solution effectively removes dust from heat-dissipating components without increasing device weight or cost, maintaining cooling efficiency while simplifying the structure.
Implementation Method 1
heat from electronic components (heat-emitting components), such as central processing units (CPUs), which emit heat during operation, is transferred through a heat pipe or the like to a heat-dissipating component, heat exchange with air (cooling air) supplied from a fan is made to occur
Implementation Method 2
heat exchange with air (cooling air) supplied from a fan is made to occur
Implementation Method 3
a communicating path, at least a bottom side of which is open, formed between an air outlet of the fan and a surface of the heat-dissipating component on a side thereof that opposes the fan, so as to communicate the fan air outlet with the heat-dissipating component surface
Data Source
AI summary
A notebook computer is provided with: a casing in which electronic components including a CPU are accommodated; and a heat-dissipating unit including a heat-dissipating component 37 having plural fins, and a fan 31 for supplying air to the heat-dissipating component 37. A communicating path 35 is formed between an air outlet 32b of the fan 31 and a surface 37b of the heat-dissipating component 37 on a side thereof that opposes the fan 31, so as to communicate them. An opening 32c is formed in a fan case 32 between the air outlet 32b and a main unit 33 of the fan. A duct 36 is provided so as to communicate the opening 32c with the heat-dissipating component 37. With this structure, an electronic device can be provided which has a built-in heat-dissipating unit that can restrain increase in cost and weight, and remove dust on the heat-dissipating component.