Smoke Detector Anti-Insect Perforated Plate Design
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Solution Overview
Problem
Conventional optical smoke detectors face reduced detection accuracy due to insects entering through holes in the housing, which affects their ability to distinguish between smoke and ambient light.
Innovation Solution
A smoke detector design featuring a substrate with a ring-shaped region, a central detection area, and a perforated plate with holes smaller than insect size to prevent entry, combined with a spoiler element for controlling smoke flow, enhancing anti-insect functionality and maintaining high smoke conductivity and gaseous permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If holes are formed in the housing to allow gaseous matter flow, then smoke detection function is improved, but insects can enter through the holes causing detection accuracy to decrease
Solution Approach 1:
The patent applies a perforated plate with precisely controlled hole sizes that are small enough to block insects but large enough to allow smoke and gaseous matter to pass through. This porous structure selectively permits beneficial gases while preventing harmful insect entry, resolving the contradiction between maintaining detection functionality and preventing insect interference.
Solution Approach 2:
The perforated plate serves as an intermediary component positioned between the housing and the optical detector. It mediates the interaction between the environment and the detection system by filtering out insects while allowing smoke particles to pass through, thus protecting the optical detector from contamination without compromising smoke detection capability.
2Measurement precision
If the housing is sealed to prevent insect entry, then detection accuracy is improved, but smoke and gaseous matter flow is restricted
Solution Approach 1:
The perforated plate provides a sealed structure with controlled permeability. The holes are sized to exclude insects while maintaining sufficient aperture area for smoke and gaseous matter to flow freely. This selective permeability allows the housing to remain largely sealed against insects while preserving smoke detection functionality.
Solution Approach 2:
The perforated plate introduces localized openings in an otherwise sealed housing structure. The local quality of the plate (with its specific hole pattern and size) allows different regions to serve different functions: the plate body provides sealing and insect blocking, while the holes provide controlled gas flow paths, resolving the contradiction between sealing and permeability.
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 solution effectively prevents insects from interfering with the detection process while maintaining high accuracy by using a perforated plate with apertures smaller than common insects and an asymmetric guiding hole structure for smoke flow management.
Implementation Method 1
The optical detector projects an optical signal onto the gaseous matter inside the housing, and detects variation of scattering parameters resulted from the illuminated gaseous matter to determine concentration of the gaseous matter
Data Source
AI summary
A smoke detector with an anti-insect function includes a substrate, an optical detection module, a top cover, a base and a perforated plate. The substrate has a ring shape region surrounding a central detection region, and a first block structure of the central detection region is protruded from the substrate and higher than an upper surface of the ring shape region. The optical detection module is disposed inside the central detection region. The top cover has a lateral wall. The base is disposed on the substrate and connected to the top cover to cover the optical detection module. The base has a second block structure partly overlapped with the lateral wall to form a guiding channel. The perforated plate is disposed between the lateral wall and the second block structure to prevent an insect from moving into the top cover through the guiding channel.