Detectors and fire alarm systems

The sensor's design with airflow control walls and branching flow paths ensures efficient smoke inflow into the detection chamber, minimizing false detections by directing smoke and diverting heavier steam, thereby improving detection accuracy.

JP7873446B2Inactive Publication Date: 2026-06-12PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2023-10-25
Publication Date
2026-06-12
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

There are regions on the peripheral wall of the smoke detection chamber where smoke does not easily flow in, obstructing the inflow path and potentially leading to false detections.

Method used

The sensor includes a smoke detection chamber with an inlet and airflow control walls that extend from the chamber to the circumferential wall, branching the gas flow path into upper and lower paths, ensuring smoke primarily flows into the chamber while heavier steam is diverted, and airflow control walls reduce variation in smoke inflow.

Benefits of technology

This configuration improves smoke inflow into the detection chamber, reducing the likelihood of false detections by ensuring only smoke enters, thus enhancing detection accuracy.

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Patent Text Reader

Abstract

To improve smoke inflow property with respect to a smoke detection chamber.SOLUTION: A sensor 1 includes a smoke detection chamber 4 and at least one of airflow control walls 8. The smoke detection chamber 4 includes inflow openings 40 from which smoke flows in. The airflow control walls 8 are arranged in the periphery of the smoke detection chamber 4. The airflow control wall 8 controls an airflow so as to reduce variations of smoke inflow property with respect to the smoke detection chamber 4 in a circumferential direction A3 of the smoke detection chamber 4.SELECTED DRAWING: Figure 5
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Citation Information

Patent Citations

  • Sensor

    JP2009230647A

  • Heat-smoke composite type sensor

    JP2012014330A

  • Smoke detector

    JP2019168830A

  • sensor

    JP2020061122A