Spiral Insect Guard for Low-Resistance Smoke Sampling
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Solution Overview
Problem
Existing smoke detection systems with insect guards accumulate dust and impede airflow due to mesh structures, leading to potential false alarms and reduced efficiency.
Innovation Solution
A spiral-shaped insect guard made of coiled wire is used to prevent insect entry while minimizing airflow impedance and dust accumulation, adhering to regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mesh insect guard is used to prevent insect entry, then insect protection is improved, but airflow impedance and dust accumulation increase
Solution Approach 1:
The patent applies a spiral configuration to the insect guard wires, transforming straight or grid-like structures into curved, spiral forms. This curvature creates larger effective apertures while maintaining insect blocking capability, allowing smoke particles to pass through more freely while still preventing insect entry into the sampling chamber.
Solution Approach 2:
The patent transitions from a two-dimensional mesh plane to a three-dimensional spiral structure. The spiral wires extend through space in a helical pattern, creating volume-based filtration that maintains open apertures throughout the structure, improving airflow while retaining insect protection.
2Reliability
If a mesh insect guard is used to prevent insect entry, then insect protection is improved, but dust accumulation increases
Solution Approach 1:
The spiral curvature of the wires creates a surface geometry that reduces dust accumulation. The curved, helical surfaces do not provide flat horizontal surfaces where dust can settle and accumulate, making the structure easier to keep clean while maintaining its insect-blocking function.
Solution Approach 2:
The spiral configuration creates larger effective apertures compared to traditional mesh, allowing smoke particles to pass through more freely while still preventing insect entry. The curved structure maintains open pathways that reduce particle accumulation on the guard surface.
3Reliability
If mesh aperture size is reduced to meet fire standards, then insect protection is improved, but smoke particle entry is impeded
Solution Approach 1:
By transitioning from a 2D mesh plane to a 3D spiral structure, the patent creates multiple layers of wire that collectively block insects while maintaining large open apertures between the wires. The three-dimensional arrangement allows smoke particles to navigate through the structure more easily while still preventing insect penetration.
Solution Approach 2:
The spiral curvature creates larger effective opening areas compared to straight wire configurations. The helical path of the wires provides insect-blocking barriers while maintaining generous clearance for smoke particle passage, resolving the contradiction between protection and detection efficiency.
Data Source
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AI summary
Devices, methods, and systems having insect guards in devices and systems for aspirated smoke, gas, or air quality monitoring are described herein. One aspirated smoke, gas, or air quality monitoring unit includes a detector module that includes at least one particulate sensing chamber within the detector module and an air inlet connecting the sampling tube to the particulate sensing chamber allowing communication of air from the sampling tube to the particulate sensing chamber; and a spiral shaped insect guard positioned within the inlet.