Corrugated Bug Screen for Smoke Detector Airflow
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Solution Overview
Problem
Conventional mesh bug screens in smoke detectors inhibit air flow and limit smoke entry, affecting the detector's ability to accurately detect smoke, while also failing to effectively prevent insect intrusion.
Innovation Solution
A corrugated bug screen design with louvers and mesh corrugation features that allow for improved fluidic ingress and inhibit bug ingress, enhancing smoke detection efficiency by allowing unobstructed air flow and trapping insects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional mesh bug screen is used to surround the air flow openings, then insect intrusion is prevented, but air flow is inhibited and smoke entry is limited
Solution Approach 1:
The bug screen is segmented into multiple discrete elements arranged in a grid pattern, with spaces between them that allow air flow while still blocking insects. This segmentation enables the screen to perform both insect prevention and air flow functions simultaneously.
Solution Approach 2:
The bug screen elements have varying local properties - the mesh structure provides insect blocking at specific locations while maintaining open spaces for air flow. The local quality of the screen allows different regions to serve different functions: blocking insects while permitting smoke particles to pass through.
2Object-affected harmful factors
If a uniform cylindrical mesh bug screen is used, then insect prevention is achieved, but air flow behavior is inhibited
Solution Approach 1:
The bug screen transitions from a two-dimensional flat mesh to a three-dimensional corrugated structure with alternating peaks and valleys. This dimensional change creates channels that guide air flow while maintaining insect blocking capability, reducing air flow resistance.
Solution Approach 2:
The bug screen elements feature curved and angled surfaces rather than flat planes. The corrugated geometry with rounded peaks and valleys smooths air flow transitions, reducing turbulence and pressure drop while maintaining effective insect screening.
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 corrugated bug screen design improves smoke detection accuracy by facilitating better air flow and preventing insect interference, making it easier to qualify for regulatory standards and requalify production samples.
Implementation Method 1
The corrugated bug screen permits fluidic ingress to the chamber and inhibits bug ingress to the chamber
Data Source
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AI summary
A detection chamber assembly (101) of a smoke detector (701) is provided. The detection chamber assembly (101) includes upper (110) and lower covers (120), louvers (130) and a corrugated bug screen (150). The louvers are arranged with the upper and lower covers to define a chamber (140) bound between the upper and lower covers and the louvers. The louvers include a first pair of louvers (131) defining a first space (1310) therebetween to permit fluidic ingress to the chamber (140) and a second pair of louvers (132) defining a second space (1320) therebetween to permit fluidic ingress to the chamber (140). The bug screen either wraps around the louvers and indents inwardly or outwardly in correspondence of a pair of louvers or it is provided in correspondence of the pair of louvers.