Projector Cooling System Dual Intake Duct Design
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Solution Overview
Problem
Conventional projectors face challenges in optimally cooling the power supply without increasing noise levels, especially when enhancing the electric power supplied to the light source, which leads to increased heating values and instability in the power supply's cooling efficiency.
Innovation Solution
The projector design incorporates a dual intake duct system, where the second intake duct with a larger cross-sectional area takes in outside air actively, and the first intake duct with a dustproof filter draws in less air, allowing for effective cooling of the power supply without increasing air flow, thus reducing noise and preventing dust from entering the optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the electric power supplied to the light source is increased to improve brightness, then the illumination intensity is improved, but the heating value of the power supply increases making it difficult to cool optimally
Solution Approach 1:
The air intake system is segmented into two separate ducts: a first intake duct with a dustproof filter for minimal air intake, and a second intake duct with a larger cross-sectional area for active outside air intake. This segmentation allows independent optimization of dust prevention and cooling functions.
Solution Approach 2:
Different regions of the projector have different air intake qualities: the first intake duct provides filtered, dust-free air for areas requiring cleanliness, while the second intake duct provides abundant outside air for cooling the power supply and light source. Each region receives the appropriate air quality for its specific function.
2Object-affected harmful factors
If a dustproof filter is used in the first intake duct, then dust contamination is prevented, but the air flow for cooling is reduced
Solution Approach 1:
The air intake system is segmented into two separate ducts: a first intake duct with a dustproof filter for minimal air intake, and a second intake duct with a larger cross-sectional area for active outside air intake. This segmentation allows independent optimization of dust prevention and cooling functions.
Solution Approach 2:
The second intake duct serves multiple functions: it provides abundant outside air for cooling the power supply and light source, and also supplies air to the exhaust fan. This multi-functionality ensures sufficient cooling air availability without compromising the dustproof function of the first duct.
3Temperature
If the cross-sectional area of the second intake duct is increased for better cooling, then the cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The air intake system is segmented into two separate ducts: a first intake duct with a dustproof filter for minimal air intake, and a second intake duct with a larger cross-sectional area for active outside air intake. This segmentation allows independent optimization of dust prevention and cooling 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 configuration enables optimal cooling of the power supply without increasing noise or allowing dust into the optical system, maintaining high-quality image projection and reducing the risk of dust contamination.
Implementation Method 1
a first intake duct 84 with a dustproof filter 84a
Implementation Method 2
a light modulator 10 that includes the image generating device 12 and an illuminating unit 20 that illuminates the image generating device 12
Implementation Method 3
a heat sink 13 that dissipates the heat that the image generating device gives off
Implementation Method 4
An exhaust fan 86 is placed behind the exhaust vent 85
Implementation Method 5
the air that flows into the apparatus though the first intake duct 84 and the second intake duct 131 is exhausted through the exhaust vent 85 by the exhaust fan 86
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
In a projector (1) that includes a light source (61), an image forming unit (101), a projection optical unit (102), and a case (59) to contain the light source (61), the image forming unit (101), the projection optical unit (102), and the power supply (80), takes outside air in through a first intake duct (84) provided on the case (59), cools the power supply (80) by circulating the taken outside air to the power supply (80) circumventing the projection optical unit (102), and exhausts the air after cooling through an exhaust vent (85) provided on the case (59). A second intake duct (131) is provided nearby the power supply (80) compared to the first intake duct (84), and the amount of outside air drawn into the case (59) through the second intake duct (131) is larger than the amount of outside air drawn into the case (59) through the first intake duct (84).