Projector Arc Tube Cooling via Collision Jet Flow
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Solution Overview
Problem
Existing projector designs with discharge-type arc tubes face cooling efficiency issues due to temperature gradients within the arc tube, leading to reduced transparency and increased risk of blackening, which shortens the lifespan of the light source.
Innovation Solution
A light source device with a container body that accommodates the arc tube and features multiple openings for cooling fluids to collide above the light emission portion, generating a collision jet flow that improves heat transmission and reduces temperature differences within the arc tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is directly supplied to the high-temperature part close to the bulb center, then the cooling effect is strong, but the cooling efficiency lowers
Solution Approach 1:
The cooling air supply is divided into multiple streams through multiple openings positioned around the arc tube. Instead of one direct cooling path, multiple segmented cooling flows are introduced at different positions and angles to collide and mix, creating a more uniform cooling effect that prevents localized overheating while maintaining overall cooling efficiency.
Solution Approach 2:
The openings are positioned asymmetrically around the arc tube at specific angles (e.g., 45 degrees from the vertical axis) rather than symmetrically or directly at the center. This asymmetric arrangement allows cooling air streams to collide and mix in a controlled manner, creating a more effective cooling pattern that addresses the temperature distribution in the arc tube more efficiently.
2Loss of energy
If the flow speed of cooling fluid is raised to reduce temperature boundary layer thickness, then heat transmission improves, but fan size or rotation speed must increase causing noise and size issues
Solution Approach 1:
The collision of cooling air streams creates periodic turbulence and mixing patterns that enhance heat transfer. The intermittent collision and mixing of air streams from multiple openings generates dynamic flow patterns that continuously renew the boundary layer, improving heat transmission without requiring continuously high flow speeds from a large fan.
Solution Approach 2:
The invention uses pneumatic principles by introducing multiple cooling air streams that collide and mix within the housing. This pneumatic mixing approach creates enhanced turbulence and heat transfer through the collision dynamics of gas streams, achieving improved heat transmission through fluid dynamics rather than through high-speed single-stream cooling that would require larger fans.
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 collision jet flow enhances cooling efficiency, prolongs the life of the arc tube, and prevents deterioration by ensuring uniform cooling across the light emission portion.
Implementation Method 1
The plural openings are formed at positions that allow the cooling fluids passing through the openings to collide with each other at a collision position above the light emission portion
Implementation Method 2
generating a collision jet flow that improves heat transmission and reduces temperature differences within the arc tube
Implementation Method 3
there is a method which reduces the thickness of the temperature boundary layer of the cooling target to a thin film layer to promote heat transmission from the cooling target to cooling fluid
Implementation Method 4
For promoting heat transmission at an improved heat transfer rate during cooling of the cooling target, there is a method which reduces the thickness of the temperature boundary layer
Data Source
AI summary
A light source device includes: an arc tube having a light emission portion containing a pair of electrodes and configured to emit light by discharges induced between the pair of the electrodes; and a container body that accommodates the arc tube, the container body has a space in which the arc tube is accommodated, and a plurality of openings through that cooling fluids introduced from the outside of the container body are supplied into the space, the plural openings are formed at positions that allow the cooling fluids passing through the openings to collide with each other at a collision position above the light emission portion.