Peripheral Airflow Heat Sensor Layout for Thin Housing Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat sensors face challenges in achieving a thinner design due to the increased thickness caused by the projection dimension of the heat detection unit, which is required to contact vertical airflows.
Innovation Solution
The heat sensor is designed with heat detection units positioned in a peripheral region of the housing, allowing for airflow to be directed to these units through strategically placed holes, reducing the projection dimension and enabling a thinner design while maintaining effective heat detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat detection unit is arranged to contact vertical airflow, then heat detection capability is improved, but the thickness of the heat sensor increases
Solution Approach 1:
The patent transitions from a vertical airflow contact configuration to a horizontal airflow contact configuration. The heat detection unit is positioned to detect heat from airflows moving horizontally through the housing, rather than requiring vertical airflow contact. This dimensional change in airflow direction allows the heat detection unit to be positioned closer to the housing interior, reducing the projection dimension and overall thickness of the heat sensor while maintaining effective heat detection capability.
2Length of stationary object
If the heat sensor is made thinner, then appearance and installation flexibility are improved, but heat detection effectiveness deteriorates
Solution Approach 1:
The patent implements localized airflow paths within the housing that direct hot airflows generated by fire toward the heat detection unit. The housing includes specific openings and internal structures that create concentrated airflow channels, ensuring that heat from fire is efficiently delivered to the heat detection unit positioned inside the housing. This localized quality enhancement maintains detection effectiveness despite the reduced overall thickness of the sensor.
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 allows for a thinner heat sensor that can detect heat from both vertical and horizontal airflows, ensuring reliable heat detection without increasing the sensor's thickness.
Implementation Method 1
heat of gas flowing towards the heat sensor upon the fire is detected by the use of the thermistor arranged outside of the housing
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A heat sensor (1) includes: a housing (10) of a cylindrical shape which has a bottom part (11) and a side part (12); and a heat detection unit (30) provided in the housing (10) and configured to be detect heat, wherein the housing (10) has a first hole (21) and a second hole (22) from one side of which gas flows in and from another side of which the gas flows out, the first hole (21) is provided in at least one of the bottom part (11) and the side part (12), the second hole (22) is provided in at least one of the bottom part (11) and the side part (12), and when the heat sensor (1) is viewed from a central axis (J1) of the housing (10), each of the first hole (21) and the second hole (22) is provided in a peripheral region (10b) different from a center (10a) of the housing (10), and the heat detection unit (30) is provided in the peripheral region (10b) when the heat senor (1) is viewed from a central axis (J1) of the housing (10).