Fire detection apparatus

Patent metadata

Field	Value
Publication number	US-12474237-B2
Application number	US-202318453592-A
Country	US
Kind code	B2
Filing date	Aug 22, 2023
Priority date	Feb 14, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A sensor 100 is a fire detection apparatus attached to a ceiling surface 900 , and includes an inflow space 400 provided inside the sensor 100 , a detection space 300 for detecting a detection target, the detection space 300 being provided at a position on a ceiling surface 900 side of the inflow space 400 on the inside of the sensor 100 , an inner cover 2 for housing the detection space 300 , the inner cover 2 being capable of allowing gas containing the detection target to flow into and out of the detection space 300 through the inflow space 400 , an outer cover 1 for housing the inner cover 2 , the outer cover 1 being capable of allowing the gas to flow into and out of the inflow space 400 , and a suppressor 15 provided in the inflow space 400 and formed integrally with the outer cover 1 , the suppressor 15 being used to suppress inflow of moisture contained in the gas into the detection space 300.

First claim

The invention claimed is:

1 . A fire detection apparatus attached to a predetermined installation surface to detect a fire in a monitoring area, the fire detection apparatus comprising: an inflow space provided inside the fire detection apparatus, gas outside the fire detection apparatus being allowed to flow into the inflow space; a detection space for detecting a detection target, the detection space being provided at a position on an installation surface side of the inflow space on the inside of the fire detection apparatus; an inner housing section for housing the detection space, the inner housing section being capable of allowing the gas containing the detection target to flow into and out of the detection space through the inflow space; an outer housing section for housing the inner housing section, the outer housing section being capable of allowing the gas to flow into and out of the inflow space; and a suppression section provided in the inflow space and formed integrally with the outer housing section, the suppression section being used to suppress inflow of moisture contained in the gas into the detection space, a heat detection element that detects heat of gas flowing into the inflow space, a part of the heat detection element being provided to a front side of the inner housing section, a light emitting section that emits emission light into the detection space, and a light receiving section that receives scattered light generated by emission light scattered by detection targets in the detection space, a smoke detector cover, and a smoke detector base, wherein the inner housing section is an inner cover that has a first opening that is an opening for allowing gas to flow into the detection space and allowing the gas to flow out from the inside of the detection space, the smoke detector cover covers the detection space, the light emitting section, and the light receiving section together with the smoke detector base and partitions the inside and outside of the detection space, the smoke detector cover has an opening that is an opening for allowing gas to flow into the detection space and allowing the gas to flow out from the inside of the detection space, the inner housing section includes a base portion and a protrusion protruding from the base portion toward the front side, the protrusion includes a stepped portion that protrudes and rises with respect to the base portion, the outer housing section includes an outer housing section main body having a substantially hollow body shape, and a top surface portion having a substantially plate shape, the top surface portion being located on an opposite side from an installation surface side with respect to the outer housing section main body and the inflow space, the inflow space is provided in a space between the top surface portion and the inner cover in an inner space of the outer cover, the suppression section includes a plurality of walls provided to partition the inflow space, and the plurality of walls suppress inflow of moisture contained in the gas into the detection space, the plurality of walls are disposed so that respective side end portions of the plurality of walls are along an outer periphery of the stepped portion, a part of the gas introduced from outside of the fire detection apparatus to inflow space is guided along an outer peripheral wall of the stepped portion and supplied to the heat detection element, and another part of the gas introduced from outside of the fire detection apparatus to inflow space is guided to climb over the stepped portion, guided and supplied to the inside from the outer peripheral side of the fire detection apparatus through a gap between the plurality of walls, and guided to the detection space through the first opening of the inner cover and the opening of the smoke detector cover while coming into contact with a first wall, a second wall, and/or a third wall of the suppression section.

2 . The fire detection apparatus according to claim 1 , wherein at least a part of the top surface portion is formed in an inclined shape so that, when water droplets generated by the suppression section condensing the moisture adhere to the top surface portion, the water droplets are allowed to flow down from the top surface portion.

3 . The fire detection apparatus according to claim 1 , wherein:
the plurality of walls includes an intersection wall in which at least some of the plurality of walls intersect in a substantially cross shape at least in a central portion of the inflow space.

Assignees

• Hochik I Corp
• Hochiki Co

Inventors

• Washizu Keisuke
• Masuzawa Hiroki

Classifications

• G01N1/2202

  involving separation of sample components during sampling · CPC title

• G08B17/113

  Constructional details · CPC title

• G01N1/2273 Primary

  Atmospheric sampling · CPC title

• G08B17/107 Primary

  for detecting light-scattering due to smoke · CPC title