Lateral Heat Sensor Placement in Combined Smoke Detector
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Solution Overview
Problem
Conventional combined heat and smoke detectors are thick due to the heat detecting means penetrating the dark chamber, limiting their thickness and increasing manufacturing costs, while also requiring separate design modifications for the body case.
Innovation Solution
The heat detecting means are arranged laterally to the dark chamber, allowing for reduced detector thickness, improved sensitivity, and the use of smoke detector components with minimal modifications, simplifying manufacturing and design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the heat detecting means penetrates the dark chamber with the leading end projected from the top surface, then the heat detection sensitivity is improved, but the detector thickness increases
Solution Approach 1:
The heat detecting means are rearranged from a vertical penetration configuration (projecting from the top surface of the dark chamber) to a lateral arrangement (disposed beside the dark chamber). This dimensional change allows the heat detecting means to maintain exposure to ascending air currents while eliminating the need for vertical projection, thereby reducing detector thickness without sacrificing heat detection sensitivity
2Measurement precision
If the heat detecting means penetrates the dark chamber with the leading end projected from the top surface, then the heat detection sensitivity is improved, but the manufacturing cost increases
Solution Approach 1:
By rearranging the heat detecting means from a penetrating vertical configuration to a lateral arrangement beside the dark chamber, the design simplifies manufacturing processes. This eliminates the need for complex modifications to the body case and dark chamber structure, allowing for easier assembly and reduced manufacturing costs while maintaining heat detection sensitivity through alternative exposure to ascending air currents
3Measurement precision
If the heat detecting means penetrates the dark chamber with the leading end projected from the top surface, then the heat detection sensitivity is improved, but the design complexity increases
Solution Approach 1:
The lateral arrangement of heat detecting means beside the dark chamber simplifies the overall detector design compared to the penetrating configuration. This arrangement eliminates the need for complex modifications to the body case structure and dark chamber geometry, reducing design complexity while maintaining the ability to detect heat through exposure to ascending air currents generated by fire
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 reduces the detector's thickness, maintains sensitivity, lowers manufacturing costs, and unifies the design with smoke detectors, enabling effective heat and smoke detection while preventing damage to heat detecting components.
Implementation Method 1
capable of detecting fire through heat and smoke... detecting heat by means of a heat sensitive element such as thermistor... detect an ascending air current that occurs due to fire
Implementation Method 2
detecting smoke by means of a light emitting device for emitting light and a light receiving device for receiving the light emitted from the light emitting device when the light is scattered by the smoke
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A combined heat and smoke detector is provided. A housing is comprised of a body base and a body case covering an entire upper side of the body base. A circuit substrate is mounted on a top surface of the body base and disposed inside the housing. A smoke detecting portion configured to detect smoke flowing into a dark chamber and a plurality of heat detecting means for detecting heat are disposed inside the housing. The heat detecting means are arranged lateral to the dark chamber.