Fire detection apparatus
A sensor is a fire detection apparatus attached to a ceiling surface, and includes an inflow space provided inside the sensor, a detection space for detecting a detection target, the detection space being provided at a position on a ceiling surface side of the inflow space on the inside of the sensor, a housing section for housing the detection space, the 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, and an adjusting portion including a plurality of walls provided in the inflow space, the adjusting portion being used to adjust a flow velocity of the detection target flowing into the detection space.
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, a 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 inside of an installation surface side of the inflow space;
a housing section for housing the detection space, the 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; and
a heat detection element for detecting heat of gas flowing into the inflow space,
wherein the housing section includes an outer cover and an inner cover,
wherein the outer cover houses the inner cover, the outer cover includes a main body that is formed in a hollow shape, a top surface portion that is provided substantially horizontally at a position on an opposite side from the installation surface side with respect to the main body and the inflow space, an inlet for allowing gas to flow into the fire detection apparatus and allowing the gas to flow out from the inside of the fire detection apparatus, the inlet being formed in a gap between the main body and the top surface portion, and an adjusting section including a plurality of walls provided in the inflow space, the adjusting section being used to adjust a flow velocity of the detection target flowing into the detection space,
wherein the inner cover houses a base portion and the detection space, the inner cover includes 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, and a protrusion that protrudes from the base portion toward the opposite side of the installation surface,
wherein 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,
wherein the plurality of walls of the adjusting section is disposed to mutually have an interval therebetween so that a space partitioned by the plurality of walls in the inflow space has a labyrinth shape that is a shape in which an outer end portion to an inner end portion of the space partitioned by the plurality of walls cannot be connected by a straight line, the plurality of walls being formed integrally with the top surface portion of the outer cover and being provided to protrude from the top surface portion toward the installation surface to come into contact with the protrusion,
wherein the inflow space, the detection space, and the housing section are configured to allow gas to flow into the outer cover through the inlet of the outer cover, and a part of the gas can flow into the detection space through the gap between the plurality of walls of the adjusting section in the inflow space and then through the first opening of the inner cover,
wherein the protrusion of the inner cover has an elliptical shape in a front view and a stepped portion that protrudes and rises with respect to the base portion,
wherein the heat detection element is disposed at each of positions that are along extension of a major axis of the elliptical shape of the protrusion of the inner cover and that are positions of right side and left side of the stepped portion in a front view,
wherein the plurality of walls is disposed to come into contact with the protrusion, and
wherein the plurality of walls is disposed so that respective outer end portions of at least one of the plurality of walls is located at an outer edge of the stepped portion or in vicinity thereof or at a side end portion of at least one of the plurality of walls extends along outer periphery of the stepped portion.
2 . The fire detection apparatus according to claim 1 , wherein at least some of the plurality of walls are disposed in a radial shape toward an outside from a central portion of the inflow space.
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.
4 . The fire detection apparatus according to claim 1 , wherein:
the housing section includes a plurality of inlets for allowing the gas to flow into the inflow space; and
the plurality of inlets and the plurality of walls are configured so that a relative arrangement relationship between the inlets and the walls corresponding to the inlets is the same for the plurality of inlets.
5 . The fire detection apparatus according to claim 4 , wherein an installation number of the walls is an integer multiple of an installation number of the inlets.
6 . The fire detection apparatus according to claim 5 , wherein a length of a gap between adjacent walls among the plurality of walls is made substantially uniform, and/or a length of a width of each of the plurality of inlets is made substantially uniform.