Projector Cooling Fan Torque Control for Orientation-Adaptive Lamp Temperature
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Solution Overview
Problem
Existing projecting apparatuses struggle to maintain the discharge lamp at an appropriate temperature when installed in diverse positions, such as horizontally or upside down, leading to reduced reliability and shortened lamp life due to inadequate cooling systems.
Innovation Solution
The projecting apparatus incorporates a lamp duct for cooling and a control section that adjusts fan torques to prevent negative pressure, ensuring consistent cooling of the discharge lamp regardless of installation orientation, using a posture sensor to detect position and adjust fan operation accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If forced air cooling is used to cool the discharge lamp, then the lamp temperature can be maintained at appropriate levels, but the cooling system becomes complex and cannot adapt to different installation positions
Solution Approach 1:
The cooling fan is designed to perform the same cooling function regardless of the projector's installation position (horizontal or vertical). The fan continuously rotates in one direction and uses the housing structure and air inlets/outlets to adapt the cooling airflow to different orientations, making the cooling system universal for all installation positions without requiring position-specific configurations.
Solution Approach 2:
The cooling system utilizes the dynamic rotation of the cooling fan combined with the static housing structure to adapt to different installation positions. The fan's continuous rotation creates a dynamic airflow pattern that, when combined with strategically positioned air inlets and outlets in the housing, ensures effective cooling whether the projector is installed horizontally or vertically.
2Productivity
If the cooling system is designed for horizontal installation, then cooling efficiency is optimized for that position, but the system fails to cool the lamp effectively when installed upside down
Solution Approach 1:
The cooling fan is designed to perform the same cooling function regardless of the projector's installation position (horizontal or vertical). The fan continuously rotates in one direction and uses the housing structure and air inlets/outlets to adapt the cooling airflow to different orientations, making the cooling system universal for all installation positions without requiring position-specific configurations.
Solution Approach 2:
The housing structure incorporates asymmetrically positioned air inlets and outlets that work with the fan's rotation to create effective cooling airflow patterns for both horizontal and vertical installations. The air inlet is positioned to draw air in effectively whether the projector is horizontal or vertical, and the air outlet is positioned to exhaust heat efficiently in both orientations.
3Temperature
If multiple cooling fans are used to cool different portions of the lamp, then cooling coverage is improved, but power consumption and noise increase
Solution Approach 1:
Multiple cooling functions are merged into a single cooling fan. The fan is positioned and oriented to create airflow that simultaneously cools both the upper and lower portions of the discharge lamp through the housing structure and air passages, eliminating the need for separate fans for different lamp regions and thereby reducing power consumption and noise.
Solution Approach 2:
The cooling airflow is segmented into different paths within the housing that reach different portions of the lamp. The single fan creates a divided airflow pattern where some air flows cool the upper lamp region while other air flows cool the lower region, achieving comprehensive cooling coverage through one fan by utilizing the housing structure and air passages.
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 maintains the discharge lamp at an appropriate temperature across various installation positions, enhancing reliability and extending lamp life while reducing power consumption and noise.
Implementation Method 1
cooling air which has cooled the discharge lamp flows through the lamp duct
Implementation Method 2
cooling air flows in the light source unit to cool the discharge lamp
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A projecting apparatus cooling structure is provided in which a discharge lamp can be always kept at an appropriate temperature whether the projecting apparatus is horizontally installed on a flat surface for forward projection or for downward projection or suspended from the ceiling for forward projection or for upward projection, so that the reliability and safety of the discharge lamp is improved and so that the life of the discharge lamp can be extended. The projecting apparatus projects an image for display using a discharge lamp as a light source. The projecting apparatus includes an air inlet for taking in a cooling medium for cooling the projecting apparatus, an air outlet for exhausting the cooling medium for cooling the projecting apparatus, a plurality of fans which each let the cooling medium flow in a predetermined direction, a which detects a position in which the projecting apparatus is installed, and a control section which controls the plurality of fans according to the position detected by the .