Liquid Crystal Projector Cooling Device with Impinging Jet Air Streams
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Solution Overview
Problem
Existing cooling devices for liquid crystal projectors face challenges in achieving sufficient cooling capability in a narrow flow path, particularly in maintaining heat transfer efficiency while preventing temperature irregularities and luminance issues due to the limitations of the 'thinned layer method' and the reduced cooling capability of air deflecting plates.
Innovation Solution
A cooling device with two air-cooling members creating air streams with different outlet port widths, generating an impinging jet with swirling flows that impinge perpendicularly on the heat radiating surfaces of liquid crystal panels and polarizer plates, enhancing heat transfer through thermal boundary layer breakage, fluid exchange, and Coanda effect, thereby improving heat radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air cooling ducts with outlet ports are used to cool liquid crystal panels and polarizer plates, then cooling capability is improved, but temperature irregularities occur on the panel surfaces
Solution Approach 1:
The patent applies local quality by creating multiple air streams with different flow characteristics (laminar and turbulent) directed at different regions of the liquid crystal panel. The cooling system uses outlet ports positioned at various locations to generate localized cooling zones, ensuring uniform temperature distribution across the panel surface rather than applying a single uniform cooling approach.
2Volume of moving object
If the flow path is narrowed to reduce device size, then compactness is improved, but cooling capability deteriorates
Solution Approach 1:
The patent applies pneumatics by using forced air convection through carefully designed outlet ports that generate both laminar and turbulent flow patterns. This pneumatic approach enables effective heat removal from the liquid crystal panels within a compact space by optimizing air flow dynamics rather than relying on natural convection or larger cooling structures.
Solution Approach 2:
The patent applies dynamics by creating a dynamic cooling system that generates both laminar and turbulent air flows. The turbulent flow component enhances heat transfer efficiency in the narrow flow path, allowing effective cooling within a compact device size. The dynamic flow patterns adapt to the thermal conditions of the panels.
3Device complexity
If conventional air cooling methods are used, then device simplicity is maintained, but cooling efficiency is insufficient for high-luminance projectors
Solution Approach 1:
The patent applies segmentation by dividing the cooling system into multiple outlet ports that generate distinct air streams. Each outlet port creates specific flow patterns (laminar or turbulent) targeted at different regions of the liquid crystal panels. This segmented approach enhances overall cooling efficiency compared to a single conventional cooling source.
Solution Approach 2:
The patent applies periodic action through the alternating patterns of laminar and turbulent flow generated by the outlet ports. The turbulent flow creates periodic mixing and renewal of the boundary layer, enhancing heat transfer efficiency. This periodic flow characteristic improves cooling effectiveness while maintaining relatively simple device structure.
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 solution achieves a cooling capability five to ten times greater than laminar flow, effectively managing heat transfer and reducing temperature irregularities, which enhances the product's luminance and longevity by creating a highly turbulent flow field over the heated surfaces.
Implementation Method 1
a first air-cooling member which includes a first outlet port that creates a first air stream to flow along the heat radiating surface; and a second air-cooling member which includes a second outlet port that creates a second air stream to flow along the heat radiating surface
Implementation Method 2
generating an impinging jet with swirling flows that impinge perpendicularly on the heat radiating surfaces, enhancing heat transfer through thermal boundary layer breakage
Implementation Method 3
enhancing heat transfer through thermal boundary layer breakage, fluid exchange, and Coanda effect
Implementation Method 4
enhancing heat transfer through thermal boundary layer breakage, fluid exchange, and Coanda effect
Data Source
AI summary
A cooling device for use in an electronic apparatus is capable of achieving a sufficient cooling capability with an effective replacement method in a narrow flow path. The cooling device for the electronic apparatus, which includes a plurality of members juxtaposed such that surfaces thereof confront each other, at least one of the members including a heat radiating surface, includes a first air-cooling member which includes a first outlet port that creates a first air stream, and a second air-cooling member which includes a second outlet port that creates a second air stream to flow in a direction different from the first air stream. The first and second outlet ports have different opening widths, respectively.