Projector Three-Stage Liquid Cooling for Sealed Optical Components
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Solution Overview
Problem
The existing projector cooling configurations, which rely on heat pipes to conduct heat from sealed structures, face inefficiencies when dealing with increased heat loads, limiting the degree of freedom in arrangement and requiring large heat receiving and radiation members.
Innovation Solution
A projector design incorporating three circulation channels: a first channel for gas cooling, a second channel for liquid heat transfer, and a third channel for liquid heat radiation, utilizing a heat exchanger and thermoelectric conversion elements to efficiently conduct and radiate heat, allowing for improved freedom in component arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat pipe is used to conduct heat from sealed structure, then heat conduction is achieved, but heat conduction efficiency deteriorates when heat load increases
Solution Approach 1:
The patent introduces a heat exchanger as an intermediary device between the sealed structure and the external environment. The heat exchanger includes a heat receiving portion that contacts the sealed structure and a heat radiating portion exposed to external air, serving as a mediator to efficiently transfer heat from the sealed cooling target to the external environment, resolving the heat conduction efficiency problem of direct heat pipe usage.
Solution Approach 2:
The patent replaces the traditional heat pipe mechanism with a liquid circulation-based heat exchanger system. Instead of relying on phase change and capillary action in heat pipes, the system uses a pump to circulate cooling liquid through channels in the heat exchanger, providing more efficient and controllable heat transfer for high heat loads.
2Temperature
If large heat receiving member and heat radiation member are used, then heat conduction efficiency is improved, but device size increases
Solution Approach 1:
The patent employs hydraulic principles by using liquid circulation through channels in the heat receiving and heat radiating members. The cooling liquid flows through internal channels, providing efficient heat transfer with compact dimensions, avoiding the need for large external heat dissipation structures while maintaining high heat dissipation efficiency.
3Temperature
If heat pipe configuration is used, then heat conduction is achieved, but degree of freedom in arrangement is reduced
Solution Approach 1:
The patent implements a dynamic liquid circulation system where the cooling liquid can be pumped to various locations and directed through flexible tubing to different heat exchanger components. This dynamic fluid delivery system provides arrangement flexibility, allowing components to be positioned optimally for cooling efficiency without being constrained by fixed heat pipe connections.
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 effective cooling of the projector's components, enhances the degree of freedom in arrangement, and stabilizes image projection by efficiently managing heat transfer and reducing component size.
Implementation Method 1
a first circulation channel which is formed in a sealed space and where a first fluid for cooling a cooling target arranged within the sealed space circulates
Implementation Method 2
a heat exchanger which conducts the heat of the first fluid circulating through the first circulation channel to the second fluid circulating through the second circulation channel
Implementation Method 3
a second circulation channel where a second fluid to which heat of the first fluid is conducted circulates
Implementation Method 4
a third circulation channel where a third fluid to which heat is conducted from the second fluid circulates and where the heat conducted to the third fluid is radiated
Data Source
Figure 1
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AI summary
A projector which can efficiently cool a cooling target is to be provided. A projector includes: a first circulation channel which is formed in a sealed space and where a first fluid for cooling a cooling target (polarization conversion element and electro-optical device) arranged within the sealed space circulates; a second circulation channel where a second fluid to which heat of the first fluid is conducted circulates; and a third circulation channel where a third fluid to which heat is conducted from the second fluid circulates and where the heat conducted to the third fluid is radiated in a process of circulation of the third fluid. The first fluid is a gas. The second fluid and the third fluid are liquids.