Cylindrical Heat Sensor Wall Member Gas Flow Segmentation
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Solution Overview
Problem
Existing heat sensors and smoke and heat detectors often lower the heat of gases flowing towards the detection unit due to eddy flows caused by plate-shaped fins, leading to erroneous fire detection.
Innovation Solution
A heat sensor with a bottomed cylindrical shape and a wall member that separates gas flows, directing one flow closer to the heat detection unit to minimize heat loss and shorten detection time, while a smoke detection unit in a stray light attenuating labyrinth structure determines fire presence based on gas components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If plate-shaped fins are used to concentrate hot air as eddy flow, then the hot air concentration is improved, but the gas flow length increases and heat is excessively lowered
Solution Approach 1:
The internal space is divided into multiple regions by partition walls, creating separate flow paths for different gas flows. This segmentation allows the hot gas flow to be directed along a shorter path to the detection unit while other flows take different paths, thus reducing the gas flow length for the primary detection flow while maintaining effective hot air concentration.
Solution Approach 2:
The partition walls extend in the vertical direction from the bottom surface toward the opening, utilizing the vertical dimension to control and separate horizontal gas flows. This dimensional approach allows the hot gas flow to be guided along a shorter vertical and horizontal path to the detection unit, reducing the overall gas flow length while maintaining concentration effectiveness.
2Temperature
If plate-shaped fins are used to concentrate hot air, then the hot air concentration is improved, but the heat detection accuracy deteriorates due to excessive heat loss
Solution Approach 1:
The partition walls segment the internal space to create dedicated flow paths, ensuring that the hot gas flow reaches the detection unit with minimal heat loss. This segmentation prevents the heat loss that occurs in longer, unsegmented flow paths, thereby maintaining detection accuracy while still achieving hot air concentration.
Solution Approach 2:
The partition walls act as intermediaries that guide and control the gas flows, directing the hot gas flow efficiently to the detection unit. These intermediary structures enable the system to achieve both hot air concentration and heat detection accuracy by mediating the flow paths and preventing excessive heat loss.
3Temperature
If the gas flow path is lengthened by plate-shaped fins, then the hot air concentration is improved, but the detection time increases
Solution Approach 1:
The partition walls create segmented flow paths that allow the hot gas flow to reach the detection unit more quickly. By dividing the internal space and creating direct pathways, the system reduces the time required for hot air to travel to the detection unit while maintaining effective concentration through the segmented structure.
Solution Approach 2:
The vertical extension of partition walls utilizes the vertical dimension to shorten the horizontal flow path length. This dimensional approach allows hot gas to reach the detection unit faster by guiding it through a more direct three-dimensional path, reducing detection time while maintaining concentration effectiveness.
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 heat loss and shortens detection time, improving the accuracy and speed of fire detection by ensuring that the heat sensor effectively detects high temperatures and smoke components.
Implementation Method 1
a heat detection unit (3) mounted on an end portion of the board (2) to detect heat of gas flowing in from the external space
Implementation Method 2
a smoke detection unit (4) to determine whether or not a fire is present by sensing, in a space inside a stray light attenuating labyrinth structure, a smoke component that has entered the heat sensor body as a component of the gas
Data Source
AI summary
A heat sensor includes a base and a heat sensor body. The base is to be mounted onto a mounting surface of a building. The heat sensor body has a bottomed cylindrical shape and is to be attached to the base. The heat sensor body includes an opening, a board, a heat detection unit, and at least one wall member. The at least one wall member controls flow of a gas to cause the gas that passed through the opening to flow toward the heat detection unit. The at least one wall member separates the flow of the gas that has entered the heat sensor body from an external space through the opening into a plurality of gas flows and directs one of the plurality of gas flows, which has been separated to flow beside an inner surface of the heat sensor body, toward the heat detection unit.