Airflow Rate Sensor Installation Structure for Projector Cooling
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Solution Overview
Problem
The conventional projector apparatus' cooling mechanism experiences variations in airflow rate sensing due to turbulence caused by clogged filters, leading to inadequate cooling and potential damage from increased air velocity, which affects the accuracy of airflow rate detection.
Innovation Solution
An installation structure for the airflow rate sensor featuring a buffering unit, such as a concave portion within the duct, positioned downstream of the sensor's through hole to absorb turbulence, ensuring stable airflow measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is disposed in the inlet port to prevent foreign substances from affecting the optical system, then the optical system is protected from dust, but when the filter becomes clogged, turbulence occurs in the airflow through the sensor's through hole, causing inaccurate airflow rate detection
Solution Approach 1:
The airflow path is segmented into two distinct zones: a first space for turbulent flow (where the filter is located) and a second space for laminar flow (where the sensor's through hole is located). The partition wall with a through hole creates this segmentation, allowing the turbulent flow caused by filter clogging to be isolated from the sensor measurement zone, thus maintaining measurement precision while preserving the filter protection function
Solution Approach 2:
A partition wall with a through hole is introduced as an intermediary structure between the filter (source of turbulence) and the sensor (measurement device). This partition wall allows controlled airflow passage while preventing the direct transmission of turbulent flow from the filter side to the sensor side, acting as a buffer that protects the measurement system from the harmful effects of filter clogging
2Speed
If the differential pressure between inside and outside of the duct increases due to filter clogging, then the air velocity through the sensor increases, but this causes turbulence that prevents reliable airflow rate sensing
Solution Approach 1:
Different flow conditions are created in different locations: the first space (near the filter) experiences turbulent flow with higher velocity, while the second space (at the sensor) maintains laminar flow with stable velocity. The partition wall with its through hole creates this local quality difference, ensuring that the sensor operates in a controlled laminar flow environment regardless of the turbulent conditions upstream caused by filter clogging
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 prevents turbulence from affecting the airflow rate sensor, allowing for reliable detection of airflow rates and velocities, maintaining effective cooling and prolonging the lifespan of the light source units even when filters are clogged.
Implementation Method 1
detect at least one of a flow rate and a flow velocity of air flowing through the flow path by sensing the air suctioned through the through hole to the flow path by a differential pressure between a pressure in the flow path and a pressure other than the pressure in the flow path
Implementation Method 2
The buffering unit is disposed downstream of flow of the air suctioned through the through hole of the sensor so as to communicate with the through hole... prevents turbulence from affecting the airflow rate sensor
Data Source
AI summary
An airflow rate sensor is provided with a through hole, and a detection unit is disposed inside the through hole. The airflow rate is calculated based on the output voltage resulting from the temperature difference and the like caused in the detection unit by the air flowing through the through hole. A duct is provided with a concave portion so as to protrude from outside the duct toward the inside thereof. The airflow rate sensor is disposed in the duct so as to cover the concave portion, in which the through hole is in communication with the space in the concave portion. The concave portion has a bottom provided with an opening. Accordingly, an installation structure of a sensor for reliably sensing a flow rate and a projector apparatus having the same are provided.