Fire detection equipment

Abstract

The present invention provides a fire detection device capable of increasing moisture resistance of the fire detection device.　A sensor 100 is a fire detection device attached to a ceiling surface 900, and comprises: an inflow space 400 provided inside the sensor 100; a detection space 300 for detecting an object to be detected, the detection space 300 provided at a position closer to the ceiling surface 900 side than the inflow space 400 inside the sensor 100; an inner cover 2 that houses the detection space 300, the inner cover 2 allowing gas containing the object to be detected to flow in and out of the detection space 300 via the inflow space 400; an outer cover 1 that houses the inner cover 2, the outer cover 1 allowing the gas to flow in and out of the inflow space 400; and a suppression unit 15 that is provided in the inflow space 400 and is formed integrally with the outer cover 1, the suppression unit 15 for suppressing the inflow of moisture contained in the gas into the detection space 300.

Description

[Technical Field]

[0001] The present invention relates to a fire detection device. [Background technology]

[0002] Smoke detectors for determining the presence or absence of a fire based on the concentration of smoke have been proposed. Such smoke detectors include, for example, a detection space for detecting smoke, a smoke detection unit cover and a circuit board that are arranged to surround the detection space, and an outer cover that covers the smoke detection unit cover and the circuit board. The outer cover includes a main body and a guide unit that guides external gas into the detection space through openings provided in the main body and the smoke detection unit cover (see, for example, Patent Document 1). This allows external gas, including smoke, to flow into the detection space, and the presence or absence of a fire can be determined based on the concentration of the smoke. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-046112 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, in the above-mentioned conventional smoke detectors, as mentioned above, the induction section induces external gas into the detection space through openings provided in the main body and the smoke detection section cover. Therefore, if the gas contains a relatively large amount of moisture, such as steam, the moisture will easily flow into the detection space, which may reduce the accuracy of smoke detection. Therefore, there is room for improvement in terms of increasing the moisture resistance of fire detection devices such as smoke detectors.

[0005] The present invention has been made in view of the above, and has an object to provide a fire detection device that can improve the moisture resistance of the fire detection device. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the fire detection device described in claim 1 is a fire detection device that is attached to a predetermined installation surface, and is a fire detection device for detecting fires in a monitored area, and includes an inflow space provided inside the fire detection device, into which gas outside the fire detection device can flow, a detection space for detecting a detection target, the detection space being provided inside the fire detection device at a position closer to the installation surface than the inflow space, an inner accommodating means for accommodating the detection space, the inner accommodating means being capable of causing the gas containing the detection target to flow into and out of the detection space via the inflow space, an outer accommodating means for accommodating the inner accommodating means, the outer accommodating means being capable of causing the gas to flow into and out of the inflow space, and a suppression means provided in the inflow space and formed integrally with the outer accommodating means, for suppressing moisture contained in the gas from flowing into the detection space; a heat detection element configured to detect heat of gas flowing into the inflow space, the heat detection element being inserted into a second opening of the inner accommodating means with a portion of the heat detection element protruding toward the front side of the inner accommodating means; a light emitting means configured to emit light into the detection space; a light receiving means configured to receive scattered light generated by scattering by a detection target in the detection space; a smoke detection unit cover; and a smoke detection unit base. Equipped with the inner accommodating means is provided with a first opening which is an opening for allowing gas to flow into the detection space and for the gas to flow out from the detection space, the smoke detector cover, together with the smoke detector base, covers the detection space, the light emitting means, and the light receiving means and divides the inside and outside of the detection space, the smoke detector cover is provided with an opening which is an opening for allowing gas to flow into the detection space and for the gas to flow out from the detection space, the inner accommodating means is provided with a base and a protruding portion protruding from the base towards the front side, the protruding portion is provided with a step portion which protrudes and is higher than the base, the outer accommodating means is provided with a hollow outer accommodating means main body and a plate-shaped top surface portion which is located on the opposite side from the installation surface side than the outer accommodating means main body and the inflow space, the inflow space is a part of the inner space of the outer accommodating means which is provided with a first opening which is an opening for allowing gas to flow into the detection space and for the gas to flow out from the detection space, the smoke detector cover, together with the smoke detector base, covers the detection space, the light emitting means, and the light receiving means and divides the inside and outside of the detection space, the smoke detector cover is provided with an opening which is an opening for allowing gas to flow into the detection space and for the gas to flow out from the detection space, the inner accommodating means is provided with a base and a protruding portion which protrudes from the base towards the front side, the protruding portion is provided with a step portion which protrudes and is higher than the base, the outer accommodating means is provided with a hollow outer accommodating means main body and a plate-shaped top surface portion which is located on the opposite side from the installation surface side than the outer accommodating means main body and the inflow space, The suppression means is provided in the space between the inner accommodating means, and is provided to partition the inflow space and has a plurality of wall portions formed integrally with the top surface portion, and is configured to suppress the moisture contained in the gas from flowing into the detection space, and the plurality of wall portions are arranged so that their side ends follow the outer periphery of the step portion, and guide a portion of the gas that flows into the inflow space from outside the fire detection device along the outer periphery wall of the step portion and toward the heat detection element, and guide another portion of the gas that flows into the inflow space from outside the fire detection device over the step portion and through the gaps between the plurality of wall portions to the inside of the fire detection device, and while contacting at least one of the plurality of wall portions, guides it toward the detection space through the first opening of the inner accommodating means and the opening of the smoke detection unit cover.

[0007] The fire detection device according to claim 2 is the fire detection device according to claim 1, At least a portion of the top surface is configured to be inclined so that when water droplets formed by condensation of the moisture by the suppression means adhere to the top surface, the water droplets can flow down from the top surface.

[0008] The fire detection device according to claim 3 is Claim 1 or 2 In the fire detection device described in The plurality of wall portions include a cross wall portion where at least some of the plurality of wall portions cross each other at least in a central portion of the inflow space. [Effects of the Invention]

[0010] According to the fire detection device described in claim 1, the device includes an inflow space provided within the fire detection device, a detection space for detecting a detection target, the detection space being located within the fire detection device closer to the installation surface than the inflow space, an inner container for accommodating the detection space and capable of allowing gas containing the detection target to flow into and out of the detection space via the inflow space, an outer container for accommodating the inner container and capable of allowing gas to flow into and out of the inflow space, and a suppression means provided in the inflow space and integrally formed with the outer container for suppressing moisture contained in the gas from flowing into the detection space. Therefore, the suppression means provided in the inflow space, which is located at a different height from the detection space, can effectively suppress the inflow of moisture into the detection space, thereby improving the moisture resistance of the fire detection device. Furthermore, the mountability of the suppression means can be improved compared to when the suppression means is provided separately from the outer container. Furthermore, the outer container is larger in size than other components, allowing the heat capacity of the suppression means to be increased, thereby improving the moisture intrusion resistance of the fire detection device. Furthermore, since the suppression means is formed integrally with the top surface portion, the suppression means and the outer accommodating means can be constructed more simply than when the suppression means is formed integrally with the main body portion of the outer accommodating means, thereby improving the manufacturability of the suppression means and the outer accommodating means.

[0011] According to the fire detection device of claim 2, At least a portion of the top surface is configured to be inclined so that when water droplets formed by condensation caused by the suppression means adhere to the top surface, the water droplets can flow down from the top surface. This prevents water droplets from accumulating on the top surface and prevents the water droplets from impeding the function of the fire detection device.

[0012] According to the fire detection device of claim 3, Since the plurality of walls includes a cross wall portion where at least a portion of the plurality of walls cross at least in the central portion of the inflow space, a flow path for the detection target to flow from outside the device into the detection space can be secured in the inflow space, and the stability of the suppression means when attached can be improved. Furthermore, the cross wall portion can increase the heat capacity of the suppression means and can suppress the intrusion of moisture in the central portion of the inflow space, thereby further improving the moisture intrusion prevention performance. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view of a sensor according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. [Figure 17] FIG. [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. [Figure 21] FIG. [Figure 22] FIG. [Figure 23] FIG. 2 is a perspective view of the smoke detection unit base. [Figure 24] FIG. 2 is a perspective view of the smoke detection unit base. [Figure 25] FIG. 2 is a side view of the smoke detection unit base. [Figure 26] FIG. [Figure 27] FIG. 2 is a rear view of the smoke detection unit base. [Figure 28] FIG. 2 is a diagram showing the inside of a detection space. [Figure 29] 2 is a cross-sectional view of FIG. 1 taken along line B-B. [Figure 30] FIG. 30 is a diagram showing the state of gas inflow, illustrating the area corresponding to FIG. 29. [Figure 31] FIG. 30 is a diagram showing the state of gas inflow, illustrating the area corresponding to FIG. 29. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire detection device according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiment.

[0016] [Basic Concept of the Embodiment] First, the basic concept of the fire detection device according to this embodiment will be described. The fire detection device is a device that is attached to a predetermined installation surface and is used to detect fires in a monitored area.

[0017] Here, in the embodiment, a "fire detection device" is a device that detects and alerts to a fire in a monitored area based on the detection results of a detection target, and is a concept that includes, for example, optical, electrical, and thermal fire detectors and fire alarms.

[0018] In addition, the term "predetermined installation surface" refers to the surface of the object on which the fire detection device is to be installed, and is a concept that includes, for example, the ceiling surface, wall surface, floor surface, etc. of a building, but in the embodiment, it will be described as the ceiling surface of a room.

[0019] Furthermore, the term "monitored area" refers to an area that is the subject of monitoring by a fire detection device, and specifically refers to an indoor or outdoor area (for example, any space such as a room, stairwell, or corridor), but in the embodiment, it will be described as a room.

[0020] [Specific details of each embodiment] Next, specific details of the embodiment will be described.

[0021] (composition) First, the configuration of a sensor according to an embodiment will be described. Fig. 1 is a side view of a sensor according to an embodiment of the present invention, Fig. 2 is a perspective view of the sensor, Fig. 3 is a front view of the sensor, Fig. 4 is a cross-sectional view taken along line AA in Fig. 3, and Figs. 5 and 6 are exploded perspective views of the sensor. In each figure, elements of the sensor 100 related to the features of the present application are illustrated and explained using reference numerals, and elements other than those explained may have the same configuration as conventional sensors. In Fig. 4, hatching of cross sections has been omitted for ease of explanation (the same applies to other cross-sectional views).

[0022] Note that the X, Y, and Z axes in each drawing are assumed to be mutually orthogonal, with the Z axis indicating the vertical direction (i.e., the lengthwise or thickness direction when the sensor 100 is installed), with the -Z direction being referred to as the front side and the +Z direction being referred to as the rear side. Also, the description will be given assuming that the X and Y axes indicate the horizontal direction (i.e., the lateral or widthwise direction when the sensor 100 is installed). Also, in the XY plane of FIG. 3, the direction away from the center of the sensor 100 will be referred to as the outer periphery, and the direction approaching the center will be referred to as the inside.

[0023] Note that reference line 801 in Fig. 1 is a center line that passes through the center of sensor 100 and is parallel to the vertical direction of the drawing, and is shown for convenience of explanation. Note that reference lines in the other drawings are also shown for convenience of explanation. Reference line 802 in Fig. 1 is a center line that passes through the center of detection element 700 and is parallel to the vertical direction of the drawing. Reference line 803 is a line that indicates the same height position as the front-most position of protrusion 23 (i.e., the same height position as the front-most position of step 231).

[0024] 3 is a center line that passes through the center of the sensor 100 and is parallel to the vertical direction of the drawing, and reference line 805 is a center line that passes through the center of the sensor 100 and is parallel to the horizontal direction of the drawing.

[0025] 4 is a center line that passes through the center of the light receiving portion 72 and is parallel to the up-down direction in the drawing, and reference line 807 is a center line that passes through the center of the light receiving portion 72 and is parallel to the left-right direction in the drawing. Reference line 808 in Fig. 4 is a line that indicates the same height position as the base 200, and reference line 809 is a line that indicates the same height position as the front-most position of the protrusion 23 (that is, the same height position as the front-most position of the step portion 231).

[0026] Reference lines 810 and 811 in FIGS. 5 and 6 are center lines that pass through the center of the sensor 100 and are parallel to the vertical direction of the drawings.

[0027] The detector 100 is a fire detection device installed in a monitored area, for example, a device for detecting a fire in the monitored area, and is installed on a ceiling surface 900 (predetermined installation surface) of a room, as shown in FIG.

[0028] As shown in Figures 5 and 6, the detector 100 includes, for example, an outer cover 1, an inner cover 2, an inflow space 400, a detection space 300, a smoke detection unit cover 3, a smoke detection unit base 5, an insect screen 61 (Figure 6), a substrate 62, a terminal board 63, a fitting 64, a detection element 700, a light emitting unit 71, a light receiving unit 72, and a light guide 73.

[0029] (Configuration - Outer cover) 7 and 8 are perspective views of the outer cover 1, Fig. 9 is a side view of the outer cover 1, Fig. 10 is a front view of the outer cover 1, and Fig. 11 is a rear view of the outer cover 1. In each figure, for the sake of convenience, with respect to a plurality of similar components (for example, the connection portion 13, the inlet 14, etc. in Fig. 9), only some of the components will be denoted by reference numerals (the same applies to other components in other figures).

[0030] In addition, the reference lines 812 and 814 in Figures 10 and 11 are center lines that pass through the center of the outer cover 1 and are parallel to the vertical direction of the drawing, and the reference lines 813 and 815 in Figures 10 and 11 are center lines that pass through the center of the outer cover 1 and are parallel to the horizontal direction of the drawing.

[0031] The outer cover 1 is an outer accommodating means that accommodates the inner cover 2, and is an outer accommodating means that allows gas containing the detection target (hereinafter simply referred to as "gas") to flow into and out of the inflow space 400.

[0032] Here, the term "detection target" refers to an object that is detected by the detector 100, specifically an object that occurs in association with a fire in the monitored area, and is a concept that includes, for example, smoke particles that occur in association with a fire.

[0033] The outer cover 1 is made of, for example, resin and includes, for example, a main body 11, a top surface 12, a connection portion 13, an inlet 14, a suppression portion 15, and an opening 16 for a light guide, as shown in FIG.

[0034] (Configuration - Outer cover - Main body) The main body 11 is the outer storage means main body, which is the basic structure of the outer cover 1. The main body 11 is formed in a hollow shape, and specifically, as shown in Figures 7 and 8, is formed in a substantially cylindrical shape with a predetermined diameter.

[0035] (Configuration - outer cover - top surface) The top surface portion 12 is a partitioning means for partitioning the inflow space 400. The top surface portion 12 is formed, for example, from a substantially circular plate-like body (for example, a circular flat plate-like body with a diameter smaller than the outer periphery of the main body portion 11), and is provided substantially horizontally at a position opposite to the ceiling surface 900 side of the main body portion 11 and the inflow space 400 (on the front side in FIG. 10), as shown in FIGS.

[0036] (Configuration - Outer cover - Connection part) The connection portion 13 is a portion that connects the main body portion 11 and the top surface portion 12 to each other, and is, for example, a portion that extends between the main body portion 11 and the top surface portion 12 as shown in FIG.

[0037] (Configuration - Outer cover - Inlet) Inlet 14 is an opening for allowing gas to flow into and out of sensor 100. Inlet 14 is formed in the gap between main body 11 and top surface 12, and is partitioned into multiple sections by multiple connection sections 13 (i.e., multiple inlets 14 are provided).

[0038] (Configuration - outer cover - suppression part) The suppression unit 15 is a suppression means for suppressing moisture contained in the gas (for example, steam, etc.) from flowing into the detection space 300. The configuration of the suppression unit 15 will be described in detail later.

[0039] (Configuration - Outer cover - Light guide opening) The light guide opening 16 is a through opening for exposing the tip of the light guide 73 (FIGS. 5 and 6) to the outside of the detector 100.

[0040] (Configuration - Inner cover) 12 and 13 are perspective views of the inner cover 2, FIG. 14 is a side view of the inner cover 2, FIG. 15 is a front view of the inner cover 2, and FIG.

[0041] 15 and 16 indicates the major axis of the ellipse that is the circumferential shape of the protrusion 23 (FIG. 15), and also indicates the center line that passes through the center of the inner cover 2 and is parallel to the left-right direction in the drawing. The minor axis 230A in FIG. 15 and 16 indicates the minor axis of the ellipse that is the circumferential shape of the protrusion 23 (FIG. 15), and also indicates the center line that passes through the center of the inner cover 2 and is parallel to the up-down direction in the drawing.

[0042] The inner cover 2 is an inner containing means that contains the detection space 300 and is capable of allowing gas containing the detection target to flow into and out of the detection space 300 via the inflow space 400. The inner cover 2 is circular in front view and is made of, for example, resin. The inner cover 2 includes, for example, a first opening 21, a second opening 22, a protrusion 23, and a light guide opening 24 as shown in FIG. 12 .

[0043] (Configuration - Inner cover - First opening) The first opening 21 is an opening for allowing gas to flow into the detection space 300 and for allowing the gas to flow out from the detection space 300. As shown in Fig. 15 , the first opening 21 is, for example, a circular opening provided in the center of the inner cover 2 when viewed from the front.

[0044] (Configuration - Inner cover - Second opening) The second opening 22 is an opening through which the detection element 700 is inserted and disposed. As shown in Fig. 15 , the second opening 22 is, for example, a rectangular opening that has an elliptical shape when viewed from the front and is provided on both sides of the protruding portion 23 on the major axis 230 of the protruding portion 23 (the major axis of the ellipse that is the circumferential shape of the outer peripheral wall 231A when viewed from the front).

[0045] (Configuration - Inner cover - Protrusion) The protruding portion 23 is a portion that protrudes toward the front side from the base portion 200 (FIGS. 12, 14, and 15) of the inner cover 2. As shown in FIG. 15, the protruding portion 23 has, for example, an elliptical shape when viewed from the front, and includes a step portion 231.

[0046] The step portion 231 is a part of the protrusion 23 and is a portion that protrudes and is higher than the base portion 200 .

[0047] (Configuration - Inner cover - Light guide opening) The light guide opening 24 is an opening through which the light guide 73 (FIGS. 5 and 6) is inserted and disposed.

[0048] (Configuration-Inflow space) The inflow space 400 is a space into which gas from outside the sensor 100 can flow in. This inflow space 400 is provided inside the sensor 100, and more specifically, as shown in FIG. 4, it is provided in the space between the top surface portion 12 and the inner cover 2 within the internal space of the outer cover 1.

[0049] (Configuration-detection space) The detection space 300 is a space for detecting a detection target. This detection space 300 is provided inside the detector 100 at a position closer to the ceiling surface 900 than the inflow space 400, and more specifically, as shown in Fig. 4, it is provided in the space within the inner cover 2 that is surrounded by the smoke detection unit cover 3 and the smoke detection unit base 5.

[0050] (Configuration - Smoke detector cover) 17 to 19 are perspective views of the smoke detection unit cover 3, FIG. 20 is a side view of the smoke detection unit cover 3, FIG. 21 is a front view of the smoke detection unit cover 3, and FIG. 22 is a rear view of the smoke detection unit cover 3.

[0051] The smoke detection unit cover 3, together with the smoke detection unit base 5, covers the detection space 300 (Fig. 4), the light-emitting side optical element 712 (Figs. 5 and 6), and the light-receiving side optical element 722, i.e., it separates the inside and outside of the detection space 300. The smoke detection unit cover 3 is made of, for example, resin. As shown in Figs. 17 to 19, the smoke detection unit cover 3 includes, for example, an opening 31, a light-emitting side housing section 32, and a light-receiving side housing section 33.

[0052] (Configuration - Smoke detector cover - Opening) The opening 31 is an opening for allowing gas to flow into the detection space 300 and for allowing the gas to flow out from the detection space 300. The opening 31 is, for example, a circular opening as shown in FIG. 21 , and has approximately the same diameter as the first opening 21 of the inner cover 2.

[0053] (Configuration - Smoke detector cover - Each storage section) The light-emitting side accommodating portion 32 is a portion that accommodates the light-emitting side optical element 712 (FIGS. 5 and 6).

[0054] The light-receiving side housing portion 33 is a portion that houses the light-receiving side optical element 722 (FIGS. 5 and 6).

[0055] (Configuration - Smoke detector base) 23 and 24 are perspective views of the smoke detector base 5, FIG. 25 is a side view of the smoke detector base 5, FIG. 26 is a front view of the smoke detector base 5, and FIG. 27 is a rear view of the smoke detector base 5.

[0056] 21 is a center line that passes through the center of the smoke detection unit cover 3 and is parallel to the vertical direction of the drawing, and reference line 818 is a center line that is perpendicular to this. Optical axis 901 indicates the optical axis of the light-emitting unit 71 (FIG. 28) in the assembled detector 100. Optical axis 902 indicates the optical axis of the light-receiving unit 72 (FIG. 28) in the assembled detector 100. Reference line 817 in FIG. 22 is a center line that passes through the center of the smoke detection unit cover 3 and is parallel to the vertical direction of the drawing, and reference line 819 is a center line that is perpendicular to this.

[0057] The smoke detector base 5, together with the smoke detector cover 3, covers the detection space 300 (Fig. 4), the light-emitting side optical element 712 (Figs. 5 and 6), and the light-receiving side optical element 722, i.e., it separates the inside and outside of the detection space 300. The smoke detector base 5 is made of, for example, resin. The smoke detector base 5 is, for example, flat-plate shaped overall, and includes a light-emitting side housing section 51 (Figs. 23 and 26) and a light-receiving side housing section 52.

[0058] (Configuration - Smoke detector base - Each storage unit) The light-emitting side accommodating section 51 is a section that accommodates the light-emitting side optical element 712 (Figures 5 and 6), and is a section that is provided in a position corresponding to the light-emitting side accommodating section 32 of the smoke detection section cover 3 in the assembled state of the detector 100.

[0059] The light-receiving side accommodating section 52 is a section that accommodates the light-receiving side optical element 722 (Figures 5 and 6), and is a section that is provided in a position corresponding to the light-receiving side accommodating section 33 of the smoke detection section cover 3 in the assembled state of the detector 100.

[0060] (Composition - Insect net) 6 is intended to prevent insects from entering the detection space 300 (FIG. 4) while allowing gas to flow in and out of the detection space 300. The insect screen 61 is, for example, circular and provided at the first opening 21 of the inner cover 2, and is provided with a plurality of small holes (not shown) of a predetermined diameter that allow gas to flow in and out and prevent insects from entering.

[0061] (Configuration - Board) 5 and 6 is a circuit board on which an electric circuit including various elements, ICs, electric wiring, etc. is mounted. As shown in Fig. 6, for example, a light-emitting element 711 and a light-receiving element 721 are mounted on the front surface of the board 62. In addition to these elements, a detection element 700 is also mounted on the board 62.

[0062] (Configuration - terminal board) 5 and 6 covers the rear side of the components (smoke detection unit cover 3, etc.) of detector 100. Terminal board 63 is attached to ceiling surface 900 via fittings 64, i.e., it is an attachment part for attaching detector 100 to ceiling surface 900.

[0063] (Configuration - Fitting) The metal fitting 64 is detachably attached to the terminal board 63 and to an attachment structure on the ceiling surface 900 side (for example, an attachment structure that fits or engages with the metal fitting 64 to fix the metal fitting 64). By using this metal fitting 64, the sensor 100 including the terminal board 63 can be attached to the ceiling surface 900. It should be noted that the metal fitting 64 may be interpreted as corresponding to the "attachment portion."

[0064] Furthermore, although not shown in the embodiment, it is also possible to mount the sensor 100 on the ceiling surface 900 using a mounting base, which is a circular plate-shaped member having approximately the same diameter as the terminal board 63, and when this mounting base is used, the mounting base may be interpreted as corresponding to the "mounting portion." Note that the "mounting base" is a member that is provided between the sensor 100 and the ceiling surface 900 and that is used to install and mount the sensor 100 on the ceiling surface 900, but a known configuration can be applied, so detailed description will be omitted.

[0065] (Configuration - Detector element) The detection element 700 in FIGS. 5 and 6 is a thermal detection element that detects the heat of the gas that has flowed into the inflow space 400 .

[0066] The detection element 700 can be configured using, for example, a thermistor that detects a temperature corresponding to heat and outputs temperature information indicating the detected temperature. The detection element 700 is mounted on the substrate 62 and inserted into the second opening 22 of the inner cover 2 shown in Fig. 12, with a portion of the detection element 700 protruding from the front side of the inner cover 2. Note that the detection element 700 does not necessarily have to be installed; if it is installed, it will be operated as a combined smoke and heat detector, and if it is not installed, it will be operated as a smoke-only detector.

[0067] (Configuration - Light-emitting part) Figure 28 is a diagram showing the inside of the detection space 300. Note that Figure 28 shows the inside of the smoke detection unit cover 3 as seen from the front side of the assembled detector 100, and the detailed structure of the smoke detection unit base 5 is omitted for ease of explanation.

[0068] 28 is a light emitting means that emits light for detecting smoke particles, which are the detection target, into the detection space 300. The light emitting unit 71 includes, for example, a light emitting element 711 and a light emitting side optical element 712, as shown in FIGS.

[0069] (Configuration - Light-emitting part - Light-emitting element) The light emitting element 711 is a component that emits light (emitted light), and can be configured using, for example, a light emitting diode (LED). The light emitting element 711 is mounted on the substrate 62.

[0070] (Configuration - Light-emitting part - Light-emitting optical element) The light-emitting side optical element 712 is a component that guides the light emitted by the light-emitting element 711 into the detection space 300 and emits it therefrom, and can be configured using, for example, a prism. The light-emitting side optical element 712 is housed in the smoke detection unit cover 3 and the smoke detection unit base 5, for example.

[0071] The light-emitting side optical element 712 is configured, for example, to emit light from the light-emitting element 711 mainly in a direction parallel to the smoke detection unit base 5 (that is, a direction parallel to the XY plane in FIG. 3).

[0072] (Configuration - light receiving section) 28 is a light receiving means that receives scattered light generated when emitted light is scattered by smoke particles, which are the detection target, in the detection space 300. The light receiving unit 72 includes, for example, a light receiving element 721 and a light receiving side optical element 722, as shown in FIGS.

[0073] (Configuration - Light receiving section - Light receiving element) The light receiving element 721 is a component that receives light (scattered light, etc.), and can be configured using a photodiode, for example. The light receiving element 721 is mounted on the substrate 62.

[0074] (Configuration - Light receiving section - Light receiving optical element) The light-receiving side optical element 722 is a component that guides light in the detection space 300 to the light-receiving element 721, and can be configured using, for example, a prism. The light-receiving side optical element 722 is housed in the smoke detection unit cover 3 and the smoke detection unit base 5.

[0075] The light-receiving side optical element 722 is configured to guide scattered light, etc. that has been scattered by smoke particles and entered the light-receiving side optical element 722 to the light-receiving element 721.

[0076] (Configuration - Light guide) 5 and 6 is a component that functions as an indicator light for the sensor 100, and as shown in FIGS. 2 and 3, for example, a portion of it is exposed on the front side of the sensor 100. For example, if a light-emitting element (LED) separate from the light-emitting-side optical element 712 is provided on the front surface of the substrate 62, the light guide 73 is a component that guides light from this light-emitting element and outputs it to the front side of the sensor 100. The "indicator light" is a component that displays the state of the sensor 100, and, for example, outputs light of a color (e.g., green or red) that corresponds to the state of the sensor 100 to display the state of the sensor 100.

[0077] (Configuration - Other - Gas Sensor) In addition to the above configuration, a gas sensor (for example, a CO gas sensor) for detecting fire gas may be installed.

[0078] (Configuration - Details of the suppression section configuration) Next, a detailed description will be given of the configuration of the suppression unit 15. Fig. 29 is a cross-sectional view taken along line BB in Fig. 1.

[0079] The features of the suppression section 15 in this embodiment are as follows: However, unless otherwise specified, the suppression section 15 can be manufactured in any shape, by any method, and with any material.

[0080] (Configuration - Details of the configuration of the suppression section - First feature) As a first feature of the configuration of the suppression portion 15 , the suppression portion 15 is provided in the inflow space 400 and is formed integrally with the outer cover 1 .

[0081] Here, "integrally formed" is a concept that includes, for example, suppression section 15 and top surface section 12 being formed from a single member, and suppression section 15 and top surface section 12 being configured to be able to transfer heat between them to an extent comparable to when they were formed as a single member, for example by abutting suppression section 15 and top surface section 12 so that they are in close contact with each other (for example, by forming them separately from top surface section 12 and then fixing them using adhesive, etc.), but in the embodiment, suppression section 15 and top surface section 12 will be described as being formed from a single member using the same resin material.

[0082] Specifically, as shown in Figures 1, 4, 8, 11, and 29, the suppression section 15 has a plurality of wall sections 151 arranged to partition the inflow space 400, and the plurality of wall sections 151 are formed integrally with the top surface section 12 of the outer cover 1 and are arranged to protrude from the top surface section 12 toward the back side (more specifically, the plurality of wall sections 151 are arranged upright so as to abut against the protrusion section 23).

[0083] Due to this first feature, the suppression part 15 provided in the inflow space 400, which is at a different height from the detection space 300, can effectively suppress the inflow of moisture into the detection space 300, improving the moisture resistance of the sensor 100. Furthermore, the mountability of the suppression part 15 can be improved compared to when the suppression part 15 is provided separately from the outer cover 1. Furthermore, since the size of the outer cover 1 is larger than other members, the heat capacity of the suppression part 15 can be increased, thereby improving the moisture intrusion prevention ability of the sensor 100. Furthermore, compared to when the suppression part 15 is formed integrally with the main body part 11 of the outer cover 1, the suppression part 15 and the outer cover 1 can be configured more simply, improving the manufacturability of the suppression part 15 and the outer cover 1.

[0084] (Configuration - Details of the suppression section - Second feature) Next, regarding a second feature of the configuration of the suppression section 15, the multiple wall sections 151 include a first wall section 161, a second wall section 162, and a third wall section 163.

[0085] (Configuration - Details of the suppression section configuration - Second feature - First wall section) The first wall portion 161 is a cross wall portion where four wall portions 161a to 161d (hereinafter referred to as the "first cross wall portion 161a," the "second cross wall portion 161b," the "third cross wall portion 161c," and the "fourth cross wall portion 161d") intersect in an approximately cross-like shape, and is provided at least in the central portion of the inflow space 400.

[0086] 11 and 29, the first wall portion 161 is configured so that inner ends of the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, and the fourth intersecting wall portion 161d intersect with each other, and outer ends of the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, and the fourth intersecting wall portion 161d are located at or near the outer edge of the step portion 231. Furthermore, the first wall portion 161 is arranged so that the side end portions 151A of the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, and the fourth intersecting wall portion 161d are aligned along the outer periphery of the step portion 231 on the front side of the step portion 231.

[0087] 11, the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, and the fourth intersecting wall portion 161d are each formed to have a substantially curved shape in a front view. This makes it easier to prevent the gas that has flowed into the inflow space 400 from flowing into the detection space 300 through the first opening 21 without coming into contact with the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, or the fourth intersecting wall portion 161d.

[0088] (Configuration - Details of the suppression section configuration - Second feature - Second wall section) The second wall portions 162 are wall portions provided between the intersecting wall portions of the first wall portions 161, and a plurality of second wall portions 162 are provided in the inflow space 400.

[0089] 11 and 29, one second wall portion 162 is provided in each of four spaces defined by adjacent intersecting walls in the inflow space 400 (i.e., four second wall portions 162 are provided). Each second wall portion 162 is disposed such that a side end portion 151A of the second wall portion 162 is aligned along the outer periphery of the step portion 231 on the front side of the step portion 231.

[0090] Furthermore, the specific configuration of the second wall portion 162 is arbitrary, but in this embodiment, the second wall portion 162 is formed to have a substantially curved shape when viewed from the front, as shown in Fig. 11. This makes it easier to prevent gas that has flowed into the inflow space 400 from flowing into the detection space 300 through the first opening 21 without coming into contact with the second wall portion 162.

[0091] (Configuration - Details of the suppression section - Second feature - Third wall section) The third wall portion 163 is a wall portion provided between the intersecting wall portion of the first wall portion 161 and the second wall portion 162, and a plurality of third wall portions 163 are provided in the inflow space 400.

[0092] 11 and 29, the third wall portion 163 is provided in each of eight spaces defined by the first intersecting wall portion 161a, the second intersecting wall portion 161b, the third intersecting wall portion 161c, or the fourth intersecting wall portion 161d and the second wall portion 162 (i.e., eight third wall portions 163 are provided). Each third wall portion 163 is disposed such that a side end portion 151A of the third wall portion 163 is aligned along the outer periphery of the step portion 231 on the front side of the step portion 231.

[0093] Furthermore, the specific configuration of the third wall portion 163 is arbitrary, but in the embodiment, the third wall portion 163 is formed to be substantially linear in front view as shown in Fig. 11. However, without being limited to this, for example, the third wall portion 163 may be formed to have a shape other than substantially linear in front view (for example, a substantially curved shape).

[0094] (Configuration - Details of the configuration of the suppression unit - Second feature - Other configurations) Furthermore, the method of installing the multiple wall portions 151 (specifically, the first wall portion 161, the second wall portion 162, and the third wall portion 163) is arbitrary, but in this embodiment, the multiple wall portions 151 are arranged at intervals from one another so that the space (specifically, the space S described below) defined by the multiple wall portions in the inflow space 400 becomes labyrinth-shaped. Furthermore, at least some of the multiple wall portions 151 are arranged radially outward from the center of the inflow space 400.

[0095] Here, the term "labyrinth-like" refers to a shape in which the space partitioned by the plurality of walls 151 cannot be connected by a straight line from its outer end to its inner end.

[0096] 11 and 29, the first wall portions 161 are arranged such that the intersecting portions of the intersecting wall portions are located in the center of the inflow space 400, thereby forming a radial pattern. The second wall portions 162 are arranged spaced apart from the first wall portions 161 and radially extend outward from the center of the inflow space 400. The third wall portions 163 are arranged between the outer portions of the intersecting wall portions of the first wall portion 161 and the outer portions of the second wall portion 162, and are arranged at an inclination different from the inclination of the outer portions of the intersecting wall portions and the outer portions of the second wall portion 162 in a front view (i.e., they are arranged non-radially from the center of the inflow space 400 outward).

[0097] 11 , which is defined by an outer portion of either one of the cross wall portions of the first wall portion 161 or the second wall portion 162 and the third wall portion 163, and a space S2 defined by an inner portion of either one of the cross wall portions of the first wall portion 161 or the second wall portion 162 and the other inner portion of the cross wall portion of the first wall portion 161 or the second wall portion 162, can be formed into a labyrinth shape. This effectively prevents moisture contained in gas that has flowed into the flow-in space 400 from flowing into the detection space 300. Furthermore, since multiple spaces S can be formed radially, gas can be allowed to flow into the detection space 300 from various directions while preventing moisture from flowing into the detection space 300. From the above, it becomes easier to ensure the detection accuracy of the detection target.

[0098] The second feature described above ensures a flow path (specifically, space S) in inflow space 400 for the detection target to flow from outside the device into detection space 300, and the first wall portion 161 can increase the stability of suppression unit 15 when attached. Furthermore, the first wall portion 161 can increase the heat capacity of suppression unit 15 and can prevent moisture from entering the central portion of inflow space 400, further improving moisture entry prevention.

[0099] (Configuration - Details of the suppression section - Third feature) Next, as for the third feature of the configuration of the suppression section 15, the multiple inlets 14 and the multiple wall sections 151 are configured so that the relative positional relationship between the inlets 14 and the wall sections 151 corresponding to the inlets 14 is the same for each of the multiple inlets 14.

[0100] Specifically, the multiple wall portions 151 are arranged so that the same number of wall portions 151 are installed corresponding to each inlet 14. More specifically, the multiple wall portions 151 are arranged so that three wall portions 151 are visible when looking into each inlet 14 from outside the sensor 100.

[0101] In this case, the method for setting the number of installed wall portions 151 is arbitrary, but in the embodiment, the number of installed wall portions 151 is set to an integer multiple of the number of installed inlets 14, from the viewpoint of easily making the gas inflow uniform at each inlet 14. Specifically, when the number of installed inlets 14 is 8, the number of installed wall portions 151 is set to 16.

[0102] Furthermore, the size of the wall portion 151 and the inlet 14 may be set by any method, but in this embodiment, from the viewpoint of facilitating uniformity of the gas inflow at each inlet 14, the length of the gap between adjacent wall portions 151 among the plurality of wall portions 151 (specifically, the horizontal length of the gap) is set to be approximately uniform, and the width of each of the plurality of inlets 14 (specifically, the horizontal length of the inlet 14) is set to be approximately uniform. Specifically, the length (maximum length) of the gap between the adjacent wall portions 151 is set to be approximately 1 / 3 of the width of each of the plurality of inlets 14.

[0103] This third feature makes it possible to make the gas inflow characteristics at each inlet 14 uniform, and to suppress variations in the amount of gas inflow due to different inflow directions.

[0104] (Assembly procedure for detector) Next, a description will be given of a procedure for assembling the sensor 100. Here, an example of a procedure for assembling the sensor 100 will be described mainly with reference to FIGS.

[0105] First, the light-emitting side optical element 712 and the light-receiving side optical element 722 are housed in the light-emitting side housing portion 51 (FIGS. 23 and 26) and the light-receiving side housing portion 52 of the smoke detection unit base 5.

[0106] Next, the smoke detector cover 3 is attached to the smoke detector base 5 by any method (for example, by using the engagement structure provided in each component). In this case, the light-emitting side optical element 712 and the light-receiving side optical element 722 are also housed in the light-emitting side housing portion 32 (FIG. 19) and the light-receiving side housing portion 33 of the smoke detector cover 3.

[0107] Next, the substrate 62 on which the light-emitting element 711, the light-receiving element 721, and the detecting element 700 are mounted is attached to the terminal board 63 from the front side (upper side in FIG. 6) of the terminal board 63 by any method (for example, by screwing in with screws, etc.). Also, the fitting 64 is attached to the terminal board 63 from the rear side (lower side in FIG. 6) of the terminal board 63 by any method (for example, by screwing in with screws, etc.).

[0108] Next, the smoke detector base 5 with the smoke detector cover 3 attached is attached to the substrate 62 from the front side of the substrate 62 (upper side of the drawing in Figure 6) using any method (for example, a method using the engagement structure provided in each component, or a method of screwing together with screws, etc.).

[0109] Next, the inner cover 2 is attached to the terminal board 63 from the front side (upper side in FIG. 6 ) of the terminal board 63 to which the smoke detection unit cover 3 and the like are attached, using any method (for example, a method that utilizes an engagement structure provided on each component). In this case, a part of the detection element 700 is inserted into the second opening 22 of the inner cover 2 and protrudes from the inner cover 2 toward the front side. In addition, the light guide 73 is inserted into the light guide opening 24 of the inner cover 2.

[0110] Next, the insect screen 61 is installed in the first opening 21 of the inner cover 2.

[0111] Next, the outer cover 1 is attached to the terminal board 63 from the front side (upper side in FIG. 6) of the terminal board 63 to which the inner cover 2 and other components are attached, using any method (for example, a method utilizing an engagement structure provided on each component). In this case, as shown in FIG. 1, the suppression portion 15 abuts against the protrusion 23 of the inner cover 2. The first wall portion 161 of the suppression portion 15 presses down on the insect screen 61, thereby fixing the insect screen 61 to the sensor 100. The tip of the light guide 73 is exposed to the outside of the sensor 100 through the light guide opening 16 (FIG. 7) of the outer cover 1. In this manner, the assembly of the sensor 100 shown in FIGS. 1 to 4 is completed.

[0112] (Fire detection operation) Next, the operation of the detector 100 for detecting a fire will be described.

[0113] Sensor 100 performs an operation to detect a fire based on, for example, the amount of light received by light receiving unit 72 or the temperature of the gas detected by detection element 700, but this operation can be performed using a known operation, so only an outline will be explained. Furthermore, since sensor 100 is provided with two detection elements 700, it is configured to use the detection result of the detection element 700 that detected the higher temperature of the two detection elements 700.

[0114] (Fire detection operation - when no fire is detected) For example, if there is no fire in the monitored area, gas containing smoke particles does not flow into detection space 300 in Fig. 28, so scattered light is not generated based on the light emitted from light-emitting unit 71, and scattered light is not received by light-receiving unit 72. In this case, sensor 100 does not detect a fire.

[0115] Furthermore, since a relatively high-temperature gas is not supplied to the detection element 700, the temperature detected by the detection element 700 is at room temperature level. In this case, the detector 100 does not detect a fire.

[0116] (Fire detection operation - when detecting a fire) On the other hand, for example, if a fire breaks out in the monitored area, gas containing smoke particles will flow into detection space 300 in Fig. 28, and the light emitted from light-emitting unit 71 will be irradiated onto the smoke particles, generating a relatively large amount of scattered light, which will be received by light-receiving unit 72. In this case, sensor 100 will detect the fire. The inflow of gas into sensor 100 will be described in detail later.

[0117] Alternatively, for example, a gas with a relatively high temperature is supplied to the detection elements 700, and the temperature detected by at least one of the two detection elements 700 rises to a predetermined level. In this case, the detector 100 detects a fire.

[0118] The fire detection operation described here is an example and is not limiting. More specifically, the following operation may be performed.

[0119] For example, the light receiving unit 72 may be configured to detect a fire when it receives a relatively large amount of light and the temperature detected by the detection element 700 rises to a predetermined level, or the light receiving unit 72 may be configured to detect a fire when the temperature detected by the detection element 700 rises to a predetermined level, regardless of the light reception result of the light receiving unit 72.

[0120] (Gas inflow) Next, the flow of gas into the sensor 100 will be described.

[0121] 30 and 31 are diagrams showing the state of gas inflow, and show the region corresponding to FIG. 29. In these FIGS. 30 and 31, the gas flow is indicated by outline arrows. FIG. 30 illustrates a case in which gas is supplied toward the inside of sensor 100 from a direction corresponding to minor axis 230A of protrusion 23 (the minor axis of the ellipse that is the circumferential shape of outer peripheral wall 231A in front view). FIG. 31 illustrates a case in which gas is supplied toward the inside of sensor 100 from a direction shifted by a predetermined angle from minor axis 230A of protrusion 23.

[0122] First, in FIG. 1, when a fire breaks out, gas containing smoke particles is supplied to detector 100 along ceiling surface 900 and flows into outer cover 1 through inlet 14 of outer cover 1.

[0123] Next, a portion of the inflowing gas is guided along outer peripheral wall 231A (FIG. 29) of step portion 231 and supplied to detection element 700. In this case, a portion of the gas is also guided by side end portions 151A of multiple wall portions 151 in suppression unit 15 arranged on the front side of step portion 231 and supplied to detection element 700.

[0124] Meanwhile, another portion of the inflowing gas overcomes the step portion 231 and is guided and supplied from the outer periphery side to the inside of the sensor 100 through the gaps 152 ( FIG. 29 ) between the multiple wall portions 151 of the suppression unit 15. Thereafter, another portion of the gas flows into the detection space 300 through the first opening 21 of the inner cover 2 and the opening 31 of the smoke detection unit cover 3 while contacting the first wall portion 161, the second wall portion 162, and / or the third wall portion 163 of the suppression unit 15. In this case, moisture contained in the other portion of the gas comes into contact with the first wall portion 161, the second wall portion 162, and / or the third wall portion 163 of the suppression unit 15, and then condenses into water droplets that adhere to the suppression unit 15 and / or the top surface portion 12, thereby preventing the moisture from flowing into the detection space 300. Since an insect screen 61 (FIG. 6) is provided at the first opening 21 of the inner cover 2, another portion of the gas flows into the detection space 300 through a plurality of small holes (not shown) in the insect screen 61.

[0125] Here, as shown in Fig. 30, for example, when another portion of the gas is supplied toward the inside of sensor 100 from a direction corresponding to minor axis 230A, the other portion of the gas is guided and supplied as indicated by the white arrow in Fig. 30. Furthermore, as shown in Fig. 31, for example, when another portion of the gas is supplied toward the inside of sensor 100 from a direction shifted by a predetermined angle from minor axis 230A, the other portion of the gas is guided and supplied as indicated by the white arrow in Fig. 31.

[0126] (Effects of the embodiment) Thus, according to the embodiment, the sensor 100 is provided with an inflow space 400 provided inside the sensor 100, a detection space 300 for detecting the detection target, the detection space 300 being provided inside the sensor 100 at a position closer to the ceiling surface 900 than the inflow space 400, an inner cover 2 that houses 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 via the inflow space 400, an outer cover 1 that houses the inner cover 2, the outer cover 1 being capable of allowing gas to flow into and out of the inflow space 400, and a suppression section 15 that is provided in the inflow space 400 and is formed integrally with the outer cover 1, the suppression section 15 for suppressing moisture contained in the gas from flowing into the detection space 300.Therefore, the suppression section 15 provided in the inflow space 400, which is at a different height from the detection space 300, can effectively suppress the inflow of moisture into the detection space 300, thereby improving the moisture resistance of the sensor 100. In addition, the attachment of the suppression unit 15 can be improved compared to when the suppression unit 15 is provided separately from the outer cover 1. Furthermore, since the size of the outer cover 1 is larger than the other members, the heat capacity of the suppression unit 15 can be increased, thereby improving the moisture intrusion prevention capability of the sensor 100.

[0127] Furthermore, at least a portion of the top surface 12 is configured to be inclined so that when water droplets formed by condensation of moisture by the suppression section 15 adhere to the top surface 12, the water droplets can flow down from the top surface 12. This prevents water droplets from accumulating on the top surface 12 and prevents the function of the sensor 100 from being impaired by the water droplets.

[0128] Furthermore, since the multiple wall portions 151 include first wall portions 161 where at least some of the multiple wall portions 151 intersect in a substantially cross shape at least in the central portion of the inflow space 400, a flow path for the detection target to flow from outside the device into the detection space 300 can be secured in the inflow space 400, and stability at the time of mounting the suppression unit 15 can be improved. Furthermore, the first wall portions 161 can increase the heat capacity of the suppression unit 15 and can suppress the intrusion of moisture in the central portion of the inflow space 400, thereby further improving the moisture intrusion prevention properties.

[0129] [Modifications to the embodiment] Although the embodiments of the present invention have been described above, the specific configurations and means of the present invention can be modified and improved as desired within the scope of the technical ideas of the inventions set forth in the claims. Such modifications will be described below.

[0130] (About the problem to be solved and the effects of the invention) First, the problems that the invention aims to solve and the effects of the invention are not limited to those described above, and the present invention may solve problems that are not described above or achieve effects that are not described above, or may solve only some of the problems that are described or achieve only some of the effects that are described.

[0131] (About the detector) In the above embodiment, the sensor is described as including the detection element 700 and the second opening 22, but this is not limiting, and for example, the detection element 700 and the second opening 22 may be omitted.

[0132] (Regarding the suppression section) In the above embodiment, the suppression unit 15 in Fig. 8 is provided on the outer cover 1, but this is not limiting. For example, the suppression unit 15 may be provided on the inner cover 2. Specifically, the suppression unit 15 may be formed integrally with the inner cover 2, or the suppression unit 15 may be formed separately and fixed to the inner cover 2 using an adhesive or the like.

[0133] In the above embodiment, the suppression portion 15 is described as being formed integrally with the top surface portion 12 of the outer cover 1, but this is not limiting. For example, at least a portion of the suppression portion 15 may be formed integrally with the main body portion 11 of the outer cover 1.

[0134] Furthermore, in the above embodiment, it has been described that the suppression section 15 comprises the first wall section 161, the second wall section 162, and the third wall section 163, but this is not limited thereto, and for example, the suppression section 15 may comprise only one or two of the first wall section 161, the second wall section 162, or the third wall section 163.

[0135] In the above embodiment, the first cross wall portion 161a, the second cross wall portion 161b, the third cross wall portion 161c, and the fourth cross wall portion 161d of the first wall portion 161 are each formed to have a substantially curved shape in a front view, but this is not limiting. For example, at least a portion of the first cross wall portion 161a, the second cross wall portion 161b, the third cross wall portion 161c, and the fourth cross wall portion 161d of the first wall portion 161 may be formed to have a linear shape in a front view.

[0136] Furthermore, in the above embodiment, the second wall portion 162 is described as being formed to be approximately curved when viewed from the front, but this is not limited thereto, and it may be formed, for example, to be linear when viewed from the front.

[0137] Furthermore, in the above embodiment, it has been described that at least some of the multiple wall portions 151 are arranged radially outward from the central portion of the inflow space 400, but this is not limiting. For example, the multiple wall portions 151 may all be arranged radially outward from the central portion of the inflow space 400. Alternatively, the multiple wall portions 151 may all be arranged non-radially outward from the central portion of the inflow space 400 (for example, they may be arranged side by side at intervals from each other in the direction along the X-axis (or Y-axis)).

[0138] Furthermore, in the above embodiment, the multiple inlets 14 and the multiple wall portions 151 are configured such that the relative positional relationship between the inlets 14 and the wall portions 151 corresponding to the inlets 14 is the same for all the multiple inlets 14. However, this is not limited to this. For example, the multiple inlets 14 and the multiple wall portions 151 may be configured such that the relative positional relationship is different for all the multiple inlets 14. In this case, for example, the number of installed wall portions 151 may be set so that it is not an integer multiple of the number of installed inlets 14. Furthermore, the lengths of the gaps between adjacent wall portions 151 among the multiple wall portions 151 may be set non-uniformly, or the widths of the multiple inlets 14 may be set non-uniformly.

[0139] (About the top surface) In the above embodiment, the top surface 12 is described as being formed of a substantially circular flat plate and disposed substantially horizontally, but this is not limiting. For example, at least a portion of the top surface 12 may be configured to be inclined so that when water droplets formed by condensation caused by the suppression unit 15 adhere to the top surface 12, the water droplets can flow down from the top surface 12.

[0140] As an example, the entire top surface 12 may be formed as a substantially circular flat plate, and the top surface 12 may be provided so as to be inclined relative to the horizontal direction. Alternatively, only a portion of the top surface 12 (for example, a portion other than the outer edge of the top surface 12 and its vicinity) may be provided so as to be inclined, and the top surface 12 may be provided so as to be substantially horizontal.

[0141] This makes it possible to prevent water droplets from accumulating on the top surface portion 12, and to prevent the function of the sensor 100 from being impaired by the water droplets.

[0142] (Regarding the outer wall) In the above embodiment, the peripheral wall 231A has an elliptical peripheral shape in a front view, i.e., the protrusion 23 has an elliptical peripheral shape in a front view. However, this is not limiting. For example, the peripheral wall 231A may be configured so that the peripheral shape in a front view is an ellipse other than a perfect circle. Even with this configuration, it is possible to suppress variations in the temperature of the gas detected by the detection element 700 depending on the direction in which the gas is supplied.

[0143] (About combinations) The features of the above-described embodiment and the features of the modifications may be combined in any manner.

[0144] (Addendum) The fire detection device of Appendix 1 is a fire detection device that is attached to a predetermined installation surface and is a fire detection device for detecting fires in a monitored area, and is equipped with: an inflow space provided inside the fire detection device, into which gas outside the fire detection device can flow; a detection space for detecting a detection target, the detection space being provided inside the fire detection device at a position closer to the installation surface than the inflow space; inner accommodating means for accommodating the detection space, the inner accommodating means being capable of causing the gas containing the detection target to flow into and out of the detection space via the inflow space; outer accommodating means for accommodating the inner accommodating means, the outer accommodating means being capable of causing the gas to flow into and out of the inflow space; and suppression means provided in the inflow space and formed integrally with the outer accommodating means, for suppressing moisture contained in the gas from flowing into the detection space.

[0145] In addition, the fire detection device of Appendix 2 is the fire detection device described in Appendix 1, wherein the outer accommodating means comprises an outer accommodating means main body having a substantially hollow body shape and an approximately plate-shaped top surface portion which is located on the opposite side of the installation surface from the outer accommodating means main body and the inflow space, and the suppression means is formed integrally with the top surface portion.

[0146] In addition, the fire detection device of Appendix 3 is the fire detection device described in Appendix 2, wherein at least a portion of the top surface is configured to be inclined so that when water droplets formed by condensation of the moisture by the suppression means adhere to the top surface, the water droplets can flow down from the top surface.

[0147] Furthermore, the fire detection device of Appendix 4 is a fire detection device described in any one of Appendixes 1 to 3, wherein the suppression means comprises a plurality of wall portions arranged to partition the inflow space, and the plurality of wall portions include cross wall portions in which at least some of the plurality of wall portions intersect in an approximately cross shape at least in the central portion of the inflow space.

[0148] (Effect of supplementary notes) The fire detection device described in Appendix 1 includes an inflow space provided within the fire detection device, a detection space for detecting a detection target, the detection space being located inside the fire detection device closer to the installation surface than the inflow space, an inner container for accommodating the detection space and capable of allowing gas containing the detection target to flow into and out of the detection space via the inflow space, an outer container for accommodating the inner container and capable of allowing gas to flow into and out of the inflow space, and a suppression means provided in the inflow space and integrally formed with the outer container for suppressing moisture contained in the gas from flowing into the detection space. Therefore, the suppression means provided in the inflow space, which is located at a different height from the detection space, can effectively suppress the inflow of moisture into the detection space, thereby improving the moisture resistance of the fire detection device. Furthermore, the mountability of the suppression means can be improved compared to when the suppression means is provided separately from the outer container. Furthermore, the size of the outer container is larger than other components, allowing the heat capacity of the suppression means to be increased, thereby improving the moisture intrusion resistance of the fire detection device.

[0149] According to the fire detection device described in Appendix 2, the suppression means is formed integrally with the top surface portion, so that the suppression means and the outer accommodating means can be constructed more simply than when the suppression means is formed integrally with the main body portion of the outer accommodating means, thereby improving the manufacturability of the suppression means and the outer accommodating means.

[0150] According to the fire detection device described in Appendix 3, at least a portion of the top surface is configured to be inclined so that when water droplets formed by condensation of moisture by the suppression means adhere to the top surface, the water droplets can flow down from the top surface. This prevents water droplets from accumulating on the top surface and prevents the water droplets from impeding the function of the fire detection device.

[0151] According to the fire detection device described in Appendix 4, the multiple walls include cross walls in which at least some of the multiple walls cross in a generally cross shape at least in the central portion of the inflow space, so that a flow path for the detection target to flow from outside the device into the detection space can be secured in the inflow space and stability of the suppression means when attached can be improved. In addition, the cross walls can increase the heat capacity of the suppression means and can prevent moisture from entering the central portion of the inflow space, further improving moisture prevention. [Explanation of symbols]

[0152] 1 Outer cover 2 Inner cover 3 Smoke detector cover 5 Smoke detector base 11 Main body 12 Top section 13 Connection 14 Inlet 15 Suppression part 16 Light guide opening 21 First opening 22 Second opening 23 Protrusion 24 Light guide opening 31 Opening 32 Light-emitting side housing section 33 Light receiving side housing 51 Light-emitting side housing section 52 Light receiving side housing 61 Insect net 62 PCB 63 Terminal board 64 Metal fittings 71 Light-emitting part 72 Light receiving section 73 Light Guide 100 sensors 151 Wall 151A side end 152 Gap 161 1st wall 161a First cross wall 161b Second cross wall 161c Third cross wall 161d Fourth cross wall 162 2nd wall section 163 Third wall 200 base 230 long axis 230A short shaft 231 Stepped section 231A Peripheral wall 300 Detection Space 400 Inflow space 700 detector element 711 Light-emitting element 712 Light-emitting optical element 721 Photodetector 722 Light receiving optical element 801 Baseline 802 Reference Line 803 Reference Line 804 Reference Line 805 Reference Line 806 Reference Line 807 Reference Line 808 Reference Line 809 Reference Line 810 Reference Line 811 Reference Line 812 Reference Line 813 Reference Line 814 Reference Line 815 Baseline 816 Reference Line 817 Reference Line 818 baseline 819 baseline 900 patio surfaces 901 optical axis 902 optical axis S Space S1 Space S2 Space

Claims

1. A fire detection device that is attached to a predetermined installation surface and is used to detect fires in a monitored area, an inflow space provided inside the fire detection device, into which gas outside the fire detection device can flow; a detection space for detecting a detection target, the detection space being provided inside the fire detection device at a position closer to the installation surface than the inflow space; an inner containing means for containing the detection space, the inner containing means being capable of allowing the gas containing the detection target to flow into and out of the detection space via the inflow space; an outer accommodating means for accommodating the inner accommodating means, the outer accommodating means being capable of allowing the gas to flow into and out of the inflow space; a suppression means provided in the inflow space and integrally formed with the outer accommodating means for suppressing moisture contained in the gas from flowing into the detection space; a heat detection element configured to detect heat of the gas flowing into the inflow space, the heat detection element having a portion protruding from a front side of the inner container means and inserted into a second opening of the inner container means; a light emitting means configured to emit an output light into the detection space; a light receiving means configured to receive scattered light generated by scattering from a detection target in the detection space; Smoke detector cover, a smoke detection unit base; the inner accommodating means includes a first opening that is an opening for allowing gas to flow into the detection space and for allowing the gas to flow out from the detection space, the smoke detection unit cover, together with the smoke detection unit base, covers the detection space, the light emitting means, and the light receiving means, and separates the inside and outside of the detection space; the smoke detection unit cover has an opening that is an opening for allowing gas to flow into the detection space and for allowing the gas to flow out from the detection space, The inner storage means includes a base and a protrusion protruding from the base toward the front side, The protruding portion includes a step portion that protrudes and is higher than the base portion, The outer accommodating means includes a hollow outer accommodating means main body and a plate-shaped top surface portion, the top surface portion being located on the opposite side of the outer accommodating means main body and the inflow space from the installation surface side, the inflow space is provided in the space between the top surface portion and the inner storage means within the internal space of the outer storage means, the suppression means is provided to partition the inflow space, and includes a plurality of wall portions formed integrally with the top surface portion, and is configured to suppress moisture contained in the gas from flowing into the detection space, The plurality of wall portions are arranged such that each side end portion is along the outer periphery of the step portion, A portion of the gas that has flowed into the inflow space from outside the fire detection device is guided along the outer peripheral wall of the step portion and directed toward the heat detection element, and another portion of the gas that has flowed into the inflow space from outside the fire detection device is guided and supplied from the outer peripheral side of the fire detection device to the inside through the gaps between the multiple wall portions, and is directed toward the detection space through the first opening of the inner accommodating means and the opening of the smoke detector cover while being in contact with at least one of the multiple wall portions. Fire detection equipment.

2. At least a portion of the top surface is configured to be inclined so that when water droplets formed by condensation of the moisture by the suppression means adhere to the top surface, the water droplets can flow down from the top surface. The fire detection device according to claim 1 .

3. The plurality of wall portions include a cross wall portion in which at least a portion of the plurality of wall portions cross in a cross shape at least in a central portion of the inflow space, 3. The fire detection device according to claim 1 or 2.

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