Fire Alarm Partition Wall Isolates Sensor From Speaker Vibration
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Solution Overview
Problem
Conventional fire alarm devices with an airflow introducing hole and a sensor element near the hole experience unstable warning sound output due to air vibration caused by the speaker at the initial stage of fire sensing, leading to repeated stopping and resuming of the alarm sound.
Innovation Solution
A fire alarm device design featuring a housing with an airflow introducing hole on its upper surface, a partition wall isolating the sensor element and sound element spaces, and a slant surface configuration to enhance airflow efficiency, along with a sound passing portion and a hidden attachment base member for a compact and aesthetically pleasing design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speaker is arranged near the airflow introducing hole to output warning sound, then the alarm function is improved, but the air vibration from the speaker causes unstable alarm output and repeated stopping/resuming of warning sound
Solution Approach 1:
The housing is divided into a sensor chamber and a speaker chamber by a partition wall, separating the sensor element from the speaker. This segmentation prevents the air vibration generated by the speaker from directly affecting the sensor element and airflow near the introducing hole, thereby stabilizing the alarm output while maintaining both functions in a compact housing.
2Measurement precision
If the sensor element is arranged near the airflow introducing hole for efficient detection, then the detection sensitivity is improved, but the sensor becomes vulnerable to air vibration from the speaker
Solution Approach 1:
The partition wall creates separate chambers: the sensor chamber houses the sensor element near the airflow introducing hole for optimal detection sensitivity, while the speaker chamber isolates the speaker. This allows the sensor to maintain its sensitive position without being affected by speaker-induced air vibration.
Solution Approach 2:
The partition wall acts as an intermediary barrier between the speaker and the sensor element, blocking the transmission of air vibration while allowing the housing structure to maintain overall compactness and functional integration.
3Volume of moving object
If the housing is made compact with integrated sensor and speaker, then the device size is reduced, but the sensor and speaker interfere with each other through air vibration
Solution Approach 1:
The housing is compactly designed with internal segmentation via a partition wall that divides the space into sensor and speaker chambers. This allows both components to be integrated in a small volume while preventing their harmful interactions through the partition barrier.
Solution Approach 2:
Instead of separating components in horizontal space which would increase device footprint, the partition wall utilizes the vertical dimension to create layered chambers. The sensor element is positioned in one layer and the speaker in another, achieving compact integration without functional interference.
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
The partition wall prevents air vibration from affecting the sensor element, maintaining sensitivity and stability of the alarm output, allowing for a smaller and more design-friendly fire alarm device with efficient airflow introduction and reduced thickness.
Implementation Method 1
the air vibration caused by the speaker
Implementation Method 2
an airflow introducing hole is provided in a device housing and a sensor element is arranged near the airflow introducing hole
Data Source
Figure 1
Figure 2A~2C
Figure 3
AI summary
A fire alarm device 1 includes a housing having an airflow introducing hole, and a sensor element arranged near the airflow introducing hole within the housing. The airflow introducing hole is formed on an upper surface of the housing facing upward when the fire alarm device is installed on a wall surface. A partition wall is provided within the housing to isolate a space in which the sensor element 12a is arranged and a space in which a sound element 18 for outputting a warning sound is arranged. Thus, at the initial stage of fire sensing, it is possible to prevent a phenomenon that the output of a warning sound becomes unstable due to the air vibration caused by a speaker.