Smoke Sensor Cover Structure for Blocking False-Alarm Contaminants
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Solution Overview
Problem
Smoke sensors are prone to false detections due to foreign matter, such as insects, entering through gaps and interfering with the detection mechanism.
Innovation Solution
A smoke sensor design featuring a suppressor, such as a flange, that contacts the board and detection cover to prevent foreign matter from entering the detection space, reducing the likelihood of false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an insect net is provided on the optical base to prevent foreign matter entry, then foreign matter protection is improved, but foreign matter can still enter through the gap between the optical base and detection cover causing false detections
Solution Approach 1:
The invention divides the sealing function into multiple components: the suppressor protruding from the detection cover and the corresponding groove in the optical base. This segmentation allows each component to perform its specific function - the suppressor blocks the gap while the groove provides a mounting position and sealing interface, together preventing foreign matter entry more effectively than a single component
Solution Approach 2:
The suppressor acts as an intermediary element between the detection cover and optical base. It protrudes into the gap space to physically block foreign matter while maintaining the functional separation between the two components, allowing smoke to pass through while preventing insect entry
2Object-affected harmful factors
If the detection cover is made larger to reduce gaps, then foreign matter protection is improved, but the overall device size increases
Solution Approach 1:
Instead of solving the sealing problem in the horizontal plane by enlarging the detection cover, the invention moves to the vertical dimension by having the suppressor protrude upward from the detection cover surface. This vertical protrusion effectively seals the gap without requiring an increase in the horizontal footprint of the device
3Object-affected harmful factors
If a suppressor is added to block foreign matter entry, then foreign matter protection is improved, but the device structure becomes more complex
Solution Approach 1:
The suppressor serves multiple functions simultaneously: it blocks foreign matter entry through the gap, provides a mounting surface for the insect net, and creates a sealed interface with the optical base groove. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity
Solution Approach 2:
The invention merges the sealing function with the existing detection cover structure by integrating the suppressor as a protrusion from the detection cover itself, rather than adding a completely separate sealing component. This integration minimizes the increase in overall structural complexity
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 design effectively minimizes false detections by blocking foreign matter from entering the detection area, maintaining accurate smoke detection without complicating the sensor's internal structure.
Implementation Method 1
a smoke sensing unit configured to optically detect smoke, using a light emitting part and a light receiving part
Data Source
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AI summary
The problem to be overcome by the present disclosure is to provide a smoke sensor which can contribute to reducing the chance of a false detection due to a foreign matter. A smoke sensor (100) includes a housing (1), a detecting unit, a partition (3), a board (41), a detection cover (21) having a tubular shape with bottom, and a suppressor (5). The housing (1) has an opening (101) through which smoke flows into the housing (1) from an outside of the housing (1). The detecting unit is configured to detect the smoke in a detection space (Sp1) provided in an inside of the housing (1). The partition (3) is configured to divide the inside of the housing (1). On the board (41), the detecting unit is disposed. The detection cover (21) is configured to house the detecting unit. The suppressor (5) is disposed at a peripheral edge of an end of the detection cover (21), and configured to suppress a foreign matter from entering the detection space (Sp1) from the outside. The detection space (Sp1) is a space formed by the board (41) and the detection cover (21). The suppressor (5) is disposed between the board (41) and the partition (3). The suppressor (5) is at least partially in contact with the board (41).