Fire detection equipment

Abstract

Provided is a fire detection device that is capable of reliably guiding a hot air flow to a heat detection element.　A detector 100 is provided with detection elements 700 that detect heat in a hot air flow generated accompanying a fire in a monitoring region, wherein: the detection elements 700 are provided with a control structure in which a detection part has a step part that is disposed so as to protrude from a prescribed base part of the detector 100 and is higher than the prescribed base part, the control structure guiding the hot air flow along an outer circumferential wall of the step part to detection parts of the detection elements 700, at least a portion of the detection part of each detection element 700 is positioned on the base part side lower than the uppermost part of the step part, a labyrinth part guides the hot air flow to the detection parts of the detection elements 700 along a side end part of a plurality of division walls corresponding to the outer circumferential side of the step part, and the hot air flow including smoke introduced inside the labyrinth part is introduced through an opening that penetrates the step part of the control structure from the upper surface to the lower surface to a smoke detection part disposed at a lower portion of the control structure.

Description

[Technical Field]

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

[0002] BACKGROUND ART Conventionally, fire detection devices that detect fires based on the heat of hot air currents caused by a fire have been known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-113030 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fire detection device of Patent Document 1, fires are detected based on heat detected by a heat detection element (e.g., a thermistor) provided in the fire detection device. From the perspective of improving the accuracy of fire detection, it is important to reliably guide the hot air flow to the heat detection element, and technology for achieving this has been demanded.

[0005] The present invention has been made in view of the above, and has an object to provide a fire detection device that can reliably guide a hot airflow toward a heat detection element. [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 provided with a heat detection element that detects the heat of a hot air current that occurs in association with a fire in a monitored area, wherein the heat detection element is arranged so that a detection part thereof protrudes from a predetermined base part of the fire detection device, has a step part that is higher than the predetermined base part, and is provided with a control structure that guides the hot air current to the detection part of the heat detection element along an outer peripheral wall of the step part, and at least a part of the detection part of the heat detection element is located on the base side that is lower than the top of the step part. The fire detection device is equipped with a smoke detection unit that detects smoke associated with a fire, and the control structure has a labyrinth portion in which multiple partition walls are arranged to stand from the upper surface of the step along the outer periphery of the step with gaps between them, and the labyrinth portion introduces the hot air flow through the gaps to the smoke detection unit provided inside the fire detection device and supplies the smoke particles contained in the introduced hot air flow to the smoke detection unit, and the labyrinth portion guides the hot air flow to the detection unit of the heat detection element along side ends of the multiple partition walls that correspond to the outer periphery of the step.

[0007] The fire detection device according to claim 2 is the fire detection device according to claim 1, The hot air flow containing smoke introduced into the labyrinth section is introduced into the smoke detection section located at the bottom of the control structure via an opening that penetrates from the upper surface of the step section of the control structure to the lower surface side. [Effects of the Invention]

[0012] According to the fire detection device described in claim 1, by having a step portion that is higher than a predetermined base portion and being equipped with a control structure that guides a hot air flow along the outer wall of the step portion to the detection portion of the heat detection element, it is possible to reliably guide a hot air flow to the heat detection element, for example. The fire detection device also has a labyrinth section that introduces the hot air flow through a gap into the smoke detection section provided inside the fire detection device and supplies the smoke particles contained in the introduced hot air flow to the smoke detection section. Also, by guiding the hot air flow to the detection section of the heat detection element along the side end portions corresponding to the outer periphery of the step portions of the multiple partition walls, it is possible to reliably guide the hot air flow to the heat detection element and reliably supply smoke particles to the smoke detection section of the fire detection device, thereby improving the accuracy of fire detection.

[0013] According to the fire detection device of claim 2, The hot air flow containing smoke introduced into the labyrinth section is introduced into the smoke detection section located at the bottom of the control structure via an opening that penetrates from the top surface of the step section of the control structure to the bottom surface, making it possible to reliably supply smoke particles to the smoke detection section of a fire detection device, for example. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a side view of the sensor according to the present embodiment. [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. 2 is a front view of the smoke detection unit base. [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] FIG. [Figure 30] FIG. 2 is a perspective view of the sensor with the outer and inner covers removed. [Figure 31] FIG. 1 is a perspective view of the detector with the outer cover removed. [Figure 32] 2 is a cross-sectional view of FIG. 1 taken along line B-B. [Figure 33]FIG. [Figure 34] FIG. [Figure 35] 2 is a cross-sectional view of FIG. 1 taken along line B-B. [Figure 36] 2 is a cross-sectional view of FIG. 1 taken along line B-B. DETAILED DESCRIPTION OF THE INVENTION

[0019] 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.

[0020] [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 for detecting fires in a monitored area. The "monitored area" is an area to be monitored by the fire detection device, and specifically refers to an indoor or outdoor area, such as a room, a stairwell, a hallway, or any other space.

[0021] In the following embodiment, the case where the "monitoring area" is a room will be described as an example.

[0022] [Specific details of each embodiment] Next, specific details of the embodiment will be described.

[0023] (composition) First, the configuration of the sensor of this embodiment will be described. Fig. 1 is a side view of the sensor according to this embodiment, 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).

[0024] 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 side, and the direction approaching the center will be referred to as the inward side.

[0025] 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 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 unit 701 (Fig. 29) in detection element 700 and is parallel to the vertical direction of the drawing. Reference line 803 is a center line that passes through the center of detection unit 701 (Fig. 29) in detection element 700 and is parallel to the horizontal direction of the drawing.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] The detector 100 is a fire detection device provided in a monitored area, for example, a device for detecting a fire in the monitored area. The detector 100 is installed, for example, on a ceiling 900, which is an installation target.

[0030] The installation target for sensor 100 is not limited to ceiling 900, and may be, for example, a wall of a room (not shown), etc. However, in this embodiment, a case where the installation target is ceiling 900 (that is, a case where sensor 100 is installed on ceiling 900) will be described as an example. In this embodiment, the ceiling surface of ceiling 900, which is the installation target, and the installation surface on which sensor 100 is installed, are assumed to be surfaces along the XY plane, i.e., surfaces parallel to the XY plane. In this case, reference line 801 in FIG. 1 is perpendicular to the XY plane.

[0031] As shown in Figures 5 and 6, the detector 100 includes, for example, an outer cover 1, an inner cover 2, a smoke detector cover 3, a smoke detector base 5, an insect screen 61 (Figure 6), a circuit board 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.

[0032] (Configuration - Outer cover) 7 and 8 are perspective views of the outer cover, Fig. 9 is a side view of the outer cover, Fig. 10 is a front view of the outer cover, and Fig. 11 is a rear view of the outer cover. Note that in each figure, for the sake of convenience, with respect to multiple similar components (for example, connection portion 13, opening 14, etc. in Fig. 9), only some of the components will be described by assigning reference numerals (the same applies to other components in other figures).

[0033] 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.

[0034] The outer cover 1 covers and houses the components of the detector 100 (the inner cover 2, the smoke detection unit cover 3, etc.) from the front side, and also forms part of the outer shape of the detector 100. The outer cover 1 is made of, for example, resin. The outer cover 1 includes, for example, a main body portion 11, a top plate portion 12, a connection portion 13, an opening portion 14, a labyrinth portion 15, and an opening portion 16 for a light guide, as shown in FIG.

[0035] (Configuration - Outer cover - Main body) The main body 11 is a part that has a substantially cylindrical shape with a predetermined diameter.

[0036] (Configuration - outer cover - top panel) The top plate 12 is a portion provided on the front side of the main body 11, and is a circular, flat plate-shaped portion with a diameter smaller than the outer periphery of the main body.

[0037] (Configuration - Outer cover - Connection part) The connection portion 13 is a portion that connects the main body portion 11 and the top plate portion 12 to each other, and is, for example, a portion that extends between the main body portion 11 and the top plate portion 12 as shown in FIG.

[0038] (Configuration - Outer cover - Opening) Opening 14 is an opening for allowing hot air currents to flow into and out of sensor 100. Opening 14 is formed in the gap between main body 11 and top plate 12, and is divided into multiple sections by multiple connecting sections 13.

[0039] The term "hot air current" refers to the flow of a fluid containing a detection target that occurs in association with a fire in the monitored area, or the fluid itself, for example, the flow of a relatively high-temperature fluid or the fluid itself. The term "detection target" refers to an object 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.

[0040] (Configuration - Outer cover - Labyrinth part) The labyrinth portion 15 is a control structure that guides a hot air current to the detection element 700. The labyrinth portion 15 introduces, for example, a fluid containing a detection target into the detection space 300 (FIG. 4). The labyrinth portion 15 will be described in detail later.

[0041] The "control structure" is a component for guiding the hot airflow to the detection element 700, and includes, for example, the labyrinth portion 15 and the step portion 231 (described later). The control structure may be located at any position, for example, near the detection element 700, or may be located away from the detection element 700.

[0042] The "detection space" 300 is a light-shielded space for detecting smoke (more specifically, smoke particles), which is a detection target caused by a fire. The detection space 300 may be interpreted as corresponding to the "smoke detection unit." The position or size of the detection space 300 is arbitrary. For example, as shown in FIG. 4, the detection space 300 may be configured to be located inside the outer peripheral wall 231A of the step portion 231 of the inner cover 2. Alternatively, as a variation, the detection space 300 may be located independently of the position of the outer peripheral wall 231A. The step portion 231 and the outer peripheral wall 231A of the inner cover 2 will be described later. The detection space 300 may be located, for example, on the rear side of the step portion 231 and the labyrinth portion 15. Here, the "rear side" may be interpreted as corresponding to the "lower part."

[0043] (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.

[0044] (Configuration - Inner cover) 12 and 13 are perspective views of the inner cover, FIG. 14 is a side view of the inner cover, FIG. 15 is a front view of the inner cover, and FIG. 16 is a rear view of the inner cover.

[0045] 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.

[0046] The inner cover 2 covers and houses the components of the detector 100 (such as the smoke detection unit cover 3), and is circular in front view. The inner cover 2 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 an opening 24 for a light guide, as shown in FIG. 12.

[0047] (Configuration - Inner cover - First opening) The first opening 21 is an opening for allowing the hot airflow to flow into the detection space 300 and for allowing the hot airflow 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 in a front view. The first opening 21 is an opening that penetrates the step portion 231 from the front side to the rear side. Penetrating the step portion 231 from the front side to the rear side may be interpreted as, for example, penetrating from the front surface of the protrusion 23 having the step portion 231 to the rear side. Furthermore, the front surface of the step portion 231 (i.e., the front surface of the protrusion 23) here may be interpreted as corresponding to the "upper surface," and the rear side of the step portion 231 (i.e., the rear side of the protrusion 23) may be interpreted as corresponding to the "lower surface."

[0048] (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).

[0049] (Configuration - Inner cover - Protrusion) The protrusion 23 is a portion that protrudes from the base 200 (FIGS. 12, 14, and 15) of the inner cover 2 toward the front side. The "base" 200 is a predetermined base of the sensor 100, and is, for example, a surface provided on the outer periphery of the protrusion 23 of the inner cover 2. The configuration of the base 200 is arbitrary, but as shown in FIG. 1, for example, it may be provided in a position slightly closer to the front side (-Z direction) than the edge on the back side (+Z direction) of the opening 14 of the outer cover 1 in a side view. The protrusion 23 will be described in detail later.

[0050] (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.

[0051] (Configuration - Smoke detector cover) 17 to 19 are perspective views of the smoke detection unit cover, FIG. 20 is a side view of the smoke detection unit cover, FIG. 21 is a front view of the smoke detection unit cover, and FIG. 22 is a rear view of the smoke detection unit cover.

[0052] 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.

[0053] (Configuration - Smoke detector cover opening) The opening 31 is an opening for allowing the hot air flow to flow into the detection space 300 and for allowing the hot air flow 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.

[0054] (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).

[0055] The light-receiving side housing portion 33 is a portion that houses the light-receiving side optical element 722 (FIGS. 5 and 6).

[0056] (Configuration - Smoke detector base) 23 and 24 are perspective views of the smoke detector base, FIG. 25 is a side view of the smoke detector base, FIG. 26 is a front view of the smoke detector base, and FIG. 27 is a rear view of the smoke detector base.

[0057] 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.

[0058] 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.

[0059] (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.

[0060] 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.

[0061] (Composition - Insect net) 6 is intended to prevent insects from entering the detection space 300 (FIG. 4) while allowing hot air currents 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 hot air currents to flow in and out and prevent insects from entering.

[0062] (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.

[0063] (Configuration - terminal board) 5 and 6 covers the components (smoke detection unit cover 3, etc.) of detector 100 from the rear side. Terminal board 63 is attached to ceiling 900 via fittings 64, i.e., it is an attachment part for attaching detector 100 to ceiling 900.

[0064] (Configuration - Fitting) The fitting 64 is detachably attached to the terminal board 63 and to a mounting structure on the ceiling 900 side (for example, a structure that fits or engages with the fitting 64 to fix the fitting 64). By using this fitting 64, the sensor 100 including the terminal board 63 can be attached to the ceiling 900. It should be noted that the fitting 64 may be interpreted as corresponding to the "mounting portion."

[0065] Furthermore, although not shown in the present embodiment, it is also possible to mount sensor 100 on ceiling 900 using a mounting base, which is a circular, plate-shaped member having approximately the same diameter as 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 sensor 100 and ceiling 900 and that is used to install and mount sensor 100 on ceiling 900, but a known configuration can be applied, so detailed description will be omitted.

[0066] (Configuration - Detector element) 5 and 6 is a heat detection element that detects the heat of hot air currents that occur in association with a fire in the monitored area. Details of the detection element 700 will be described later.

[0067] (Configuration - Light-emitting part) Fig. 28 is a diagram showing the inside of the detection space. Note that Fig. 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 the sake of convenience.

[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.

[0077] (Configuration - Details of the detector element) Next, details of the detection element 700 will be described. Fig. 29 is an enlarged view of the detection element, Fig. 30 is a perspective view of the sensor with the outer cover and inner cover removed, Fig. 31 is a perspective view of the sensor with the outer cover removed, Fig. 32 is a cross-sectional view taken along line B-B in Fig. 1, and Figs. 33 and 34 are perspective views of the sensor.

[0078] Note that the reference line 820 in Figure 29 is a center line that passes through the center of the detection portion 701 in the detection element 700 and is parallel to the left-right direction of the drawing, and the reference line 821 is a center line that passes through the center of the detection portion 701 in the detection element 700 and is parallel to the up-down direction of the drawing.

[0079] As described above, detection element 700 is a heat detection element that detects the heat of a hot air current generated in association with a fire in the monitored area. Detection element 700 can be configured using, for example, a thermistor that detects a temperature corresponding to the heat and outputs temperature information indicating the detected temperature. As shown in FIG. 29 , detection element 700 includes, for example, a detection unit 701 and a terminal unit 702. For example, both the front and back surfaces of detection unit 701 are sandwiched between film-like insulating members 703.

[0080] The detection unit 701 is a part that detects heat in the detection element 700, and is, for example, a part whose resistance value changes due to temperature fluctuations. The terminal unit 702 is a terminal for electrically connecting the detection element 700 to the electric circuit of the sensor 100.

[0081] The detection element 700 is mounted on the substrate 62 as shown in Fig. 30 by inserting the terminal portion 702 into the connection hole of the substrate 62 and electrically connecting and fixing it to the wiring of the substrate 62 using solder or the like. Furthermore, since the detection element 700 is inserted into the second opening 22 (Fig. 15) of the inner cover 2, the detection element 700 (i.e., the detection portion 701 of the detection element 700) has, for example, an elliptical shape when viewed from the front as shown in Fig. 32 and is disposed on the major axis 230 of the protrusion 23 and outside the outer peripheral wall 231A of the step portion 231. That is, two detection elements 700 (i.e., the detection portion 701 of the detection element 700) are disposed outside the outer peripheral wall 231A of the step portion 231 so as to face each other with the protrusion 23 having the step portion 231 and the labyrinth portion 15 sandwiched between them.

[0082] 1 and 31, the detection element 700 is disposed so as to protrude from the base 200 of the inner cover 2 through the second opening 22 (FIG. 31). At least a part of the detection portion 701 of the detection element 700 is located on the base 200 side lower than the uppermost step of the step portion 231 (FIGS. 1 and 31) of the inner cover 2.

[0083] The uppermost step of the step portion 231 is a concept that indicates, for example, the frontmost portion of the step portion 231 (corresponding to the lowermost portion in FIG. 1 and the uppermost portion in FIG. 31). The side of the base portion 200 that is lower than the uppermost step of the step portion 231 is a concept that indicates the side closer to the base portion 200 in the vertical direction (the X-axis direction in FIG. 1). That is, at least a part of the detection portion 701 of the detection element 700 is provided between a height position that corresponds to the uppermost step of the step portion 231 of the inner cover 2 and a height position that corresponds to the base portion 200 in the vertical direction.

[0084] 1, for example, a part of the detection unit 701 of the detection element 700 is provided between a height position corresponding to the uppermost step of the step portion 231 of the inner cover 2 and a height position corresponding to the base 200, and another part of the detection unit 701 of the detection element 700 (i.e., a part closer to the front than the part of the detection unit 701 of the detection element 700 described above (i.e., a part on the lower side of the drawing in FIG. 1)) is provided at a position farther from the base 200 in the height direction than the height position corresponding to the uppermost step of the step portion 231 of the inner cover 2. Note that the arrangement of the detection element 700 is not limited to this, and for example, the entire detection unit 701 of the detection element 700 may be arranged so as to be provided between a height position corresponding to the uppermost step of the step portion 231 of the inner cover 2 and a height position corresponding to the base 200 in the vertical direction.

[0085] (Configuration - Details of protrusions) Next, the protrusion 23 shown in Figures 12, 14, and 15 will be described in detail. The protrusion 23 is a portion that protrudes from the base 200 of the inner cover 2 toward the front side, and includes a step 231, for example.

[0086] Step portion 231 is the aforementioned control structure, and is, for example, a stepped portion corresponding to the periphery of protrusion 23 (i.e., a shoulder portion of protrusion 23) as shown in Fig. 14. Step portion 231 is a portion that guides the hot air flow along outer peripheral wall 231A (Fig. 32) to detection portion 701 of detection element 700.

[0087] As shown in Fig. 14, for example, the outer peripheral wall 231A of the step portion 231 corresponds to the inclined portion of the step portion 231. For example, the outer peripheral wall 231A is inclined toward the center of the inner cover 2 as it moves away from the base portion 200 in the vertical direction of Fig. 14. For example, as shown in Fig. 32, the outer peripheral wall 231A has an elliptical circumferential shape when viewed from the front, that is, the protrusion 23 has an elliptical shape when viewed from the front.

[0088] (Configuration - Details of protrusions) Next, the labyrinth portion 15 shown in Figures 8, 9, and 11 will be described in detail. The labyrinth portion 15 is the aforementioned control structure, and also serves to introduce a fluid containing the detection target into the detection space 300. The labyrinth portion 15 includes, for example, a plurality of partition walls 151 as shown in Figure 11.

[0089] The partition walls 151 are fixed to the rear surface of the top panel 12, protrude from the top panel 12 toward the rear side by a predetermined height, and are adjacent to each other with a gap 152 therebetween. The partition walls 151 may be formed integrally with the top panel 12, or may be formed separately from the top panel 12 and then fixed using an adhesive or the like, but in this embodiment they are formed integrally.

[0090] 1 in an assembled state, the partition wall 151 is configured to stand upright from the upper surface (front surface) of the protrusion 23 having the step portion 231 of the inner cover 2, as shown in FIG. 32. The partition wall 151 extends, for example, from the inside to the outside of the sensor 100. The side end portion 151A of the partition wall 151 is disposed along the outer periphery of the step portion 231 on the front side of the step portion 231. Therefore, the side end portion 151A of the partition wall 151 is disposed on an ellipse in a front view. The side end portion 151A of the partition wall 151 is a portion corresponding to a part of the partition wall 151, specifically, a portion of the partition wall 151 corresponding to the outer periphery of the step portion 231.

[0091] Because of this configuration, the labyrinth section 15 may be interpreted as a component in which a plurality of partition walls 151 are arranged upright from the top surface of the step section 231 along the outer periphery of the step section 231 with gaps 152 between them.

[0092] (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.

[0093] 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 detector base 5.

[0094] 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.

[0095] 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.).

[0096] Next, as shown in Figure 30, 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 (the 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.).

[0097] Next, as shown in Fig. 31 , 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.

[0098] Next, the insect screen 61 is installed in the first opening 21 of the inner cover 2.

[0099] 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 (e.g., a method utilizing the engagement structure provided on each component). In this case, as shown in FIG. 1 , the labyrinth portion 15 of the outer cover 1 abuts against the protrusion 23 of the inner cover 2. Furthermore, a portion of the partition wall 151 of the labyrinth portion 15 (the crossing portion that intersects in a crisscross pattern at the center of the outer cover 1 in FIG. 11 ) presses down on the insect screen 61, securing the insect screen 61 to the sensor 100. Furthermore, 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 , 33 , and 34 is completed.

[0100] (Fire detection operation) Next, the operation of fire detection by the sensor 100 will be described. The sensor 100 performs an operation to detect a fire based on, for example, the amount of light received by the light receiving unit 72 or the temperature of the hot air current detected by the detection element 700, but this operation can be performed using a known operation, so only an outline will be described. Furthermore, since the sensor 100 is provided with two detection elements 700, it is assumed that the detection result of the detection element 700 that detected the higher temperature of the two detection elements 700 is used.

[0101] (Fire detection operation - when no fire is detected) For example, if there is no fire in the monitored area, no hot air current containing smoke particles will flow into detection space 300 in Fig. 28, so no scattered light will be generated based on the light emitted from light-emitting unit 71, and no scattered light will be received by light-receiving unit 72. In this case, sensor 100 will not detect a fire.

[0102] Furthermore, since the hot airflow containing smoke particles 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.

[0103] (Fire detection operation - when detecting a fire) On the other hand, for example, if a fire breaks out in the monitored area, a hot air current 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. Note that the supply of the hot air current caused by the outbreak of a fire to sensor 100 will be described in detail below.

[0104] Also, for example, a hot airflow containing smoke particles is supplied to the detection elements 700, causing the temperature detected by at least one of the two detection elements 700 to rise to a predetermined level. In this case, the detector 100 detects a fire.

[0105] The fire detection operation described here is an example and is not limiting. More specifically, the following operation may be performed.

[0106] 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.

[0107] (hot air flow supply) Next, the supply of a hot air current containing smoke particles, which is generated when a fire breaks out in the monitored area, to the detector 100 will be described. Figs. 35 and 36 are cross-sectional views taken along the line B-B of Fig. 1. In Figs. 35 and 36, the flow of the hot air current is indicated by outline arrows. Fig. 35 illustrates a case in which the hot air current is supplied toward the inside of the detector 100 from a direction corresponding to the minor axis 230A of the protrusion 23 (the minor axis of the ellipse that is the circumferential shape of the outer peripheral wall 231A in a front view). Fig. 36 illustrates a case in which the hot air current is supplied toward the inside of the detector 100 from a direction shifted by a predetermined angle from the minor axis 230A of the protrusion 23.

[0108] First, in FIG. 1, a hot air current generated in a monitoring area due to a fire is supplied to the detector 100 along the ceiling 900 and flows into the interior of the outer cover 1 through the opening 14 in the outer cover 1 .

[0109] Next, a part of the inflowing hot air current is guided along the outer peripheral wall 231A (FIG. 32) of the step portion 231 and supplied to the detection element 700. In this case, the hot air current is also guided by the side end portions 151A of the multiple partition walls 151 in the labyrinth portion 15 arranged on the front side of the step portion 231 and supplied to the detection element 700.

[0110] Meanwhile, another portion of the inflowing hot air current passes over the step portion 231 and is guided and supplied from the outer periphery side of the detector 100 to the inside through the gaps 152 (FIG. 32) between the multiple partition walls 151 of the labyrinth portion 15. The hot air current then 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. In particular, since an insect screen 61 (FIG. 6) is provided at the first opening 21 of the inner cover 2, the hot air current flows into the detection space 300 through multiple small holes (not shown) in the insect screen 61.

[0111] Here, as shown in Fig. 35, for example, when a hot air current is supplied toward the inside of sensor 100 from a direction corresponding to minor axis 230A, the hot air current is guided and supplied as shown by the white arrow in Fig. 35. Also, as shown in Fig. 36, for example, when a hot air current is supplied toward the inside of sensor 100 from a direction shifted by a predetermined angle from minor axis 230A, the hot air current is guided and supplied as shown by the white arrow in Fig. 36.

[0112] (Temperature of hot air current) A case will be described where hot air currents of the same temperature and at the same flow rate are supplied to sensor 100. As shown in Fig. 35, when a hot air current is supplied toward the inside of sensor 100 from the direction corresponding to minor axis 230A, hot air currents of approximately the same temperature are supplied to the two detection elements 700 in Fig. 35.

[0113] On the other hand, as shown in Fig. 36, when the hot air current is supplied toward the inside of sensor 100 from a direction shifted by a predetermined angle from minor axis 230A, the temperature of the hot air current supplied to detection element 700 on the left side of Fig. 36 will be higher than the temperature of the hot air current supplied to detection element 700 on the right side of Fig. 36. However, the temperature of the hot air current supplied to detection element 700 on the left side of Fig. 36 will be approximately the same as the temperature of the hot air current in the case of Fig. 35 (that is, the temperature of the hot air current supplied to two detection elements 700 when the hot air current is supplied toward the inside of sensor 100 from the direction corresponding to minor axis 230A).

[0114] Furthermore, although not shown, even if a hot air flow is supplied toward the inside of the sensor 100 from any direction deviating from the minor axis 230A, the detection element 700 to which the hot air flow of the higher temperature is supplied will be supplied with a hot air flow of approximately the same temperature as the temperature of the hot air flow in the case of Figure 35 (i.e., the temperature of the hot air flow supplied to the two detection elements 700 when the hot air flow is supplied toward the inside of the sensor 100 from a direction corresponding to the minor axis 230A).

[0115] These are due to the temperature distribution of the hot air current, which is determined by the configuration (particularly the configuration related to the elliptical shape) of the labyrinth portion 15 and the step portion 231 that function as the control structure, and the configuration (particularly the arrangement position) of the detection element 700, but as a result of predetermined experiments or simulations to confirm the temperature distribution of the hot air current, by using the configuration described in the embodiment, as described above, a hot air current of approximately the same temperature is supplied to at least one detection element 700 (for example, a detection element 700 that detects a higher temperature), regardless of the supply direction of the hot air current to the sensor 100. In other words, it is possible to suppress the variation in the temperature of the hot air current detected by the detection element 700 based on the supply direction of the hot air current.

[0116] The size of the labyrinth portion 15 and the step portion 231, and the size and position of the detection element 700, etc. may be set taking into account the allowable range for normal operation of the sensor 100 with respect to the magnitude of the above-mentioned variation (i.e., the variation in the temperature of the hot air flow detected by the detection element 700 based on the direction of supply).

[0117] (Effects of the embodiment) Thus, according to this embodiment, by having a step portion 231 that is higher than the base portion 200 and providing a control structure that guides a hot air flow along the outer wall 231A of the step portion 231 to the detection portion 701 of the detection element 700, it is possible to reliably guide a hot air flow to the detection element 700, for example.

[0118] The detector 100 is also provided with a labyrinth section 15, which introduces a hot air flow through a gap 152 into a detection space 300 provided inside the detector 100 and supplies smoke particles (i.e., smoke particles) contained in the introduced hot air flow to the detection space 300, and also guides the hot air flow to the detection section 701 of the detection element 700 along the side end 151A corresponding to the outer peripheral wall 231A of the step portion 231 of the multiple partition walls 151, thereby, for example, reliably guiding the hot air flow toward the detection element 700 and reliably supplying smoke particles to the detection space 300 of the detector 100, thereby improving the accuracy of fire detection.

[0119] Furthermore, the hot air flow containing smoke introduced into the labyrinth section 15 is introduced into the detection space 300 located at the bottom of the control structure via the first opening 21 that penetrates from the top surface of the step section 231 of the control structure to the bottom surface, thereby making it possible to reliably supply smoke particles to the detection space 300 of the detector 100, for example.

[0120] In addition, the hot air flow is supplied from the outer periphery of the sensor 100 toward its inside, and the peripheral shape of the outer wall 231A of the step portion 231 of the control structure is elliptical, so that it is possible to suppress variation in the temperature of the hot air flow detected by the detection element 700 based on the direction in which the hot air flow is supplied, for example.

[0121] Furthermore, since the detection section 701 of the detection element 700 is positioned on the major axis 230 of the ellipse of the step section 231 of the control structure and outside the outer peripheral wall 231A of the step section 231, it is possible to reliably guide a hot air flow toward the detection element 700 using the control structure, for example.

[0122] Furthermore, two detection sections 701 of the detection element 700 are arranged outside the outer peripheral wall 231A of the step portion 231, facing each other with the control structure in between, making it possible to suppress, for example, variation in the temperature of the hot air flow detected by at least one of the two detection elements 700 based on the direction in which the hot air flow is supplied.

[0123] [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.

[0124] (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.

[0125] (About the labyrinth section) In the above embodiment, the labyrinth portion 15 in Fig. 8 is provided on the outer cover 1, but this is not limiting. For example, the labyrinth portion 15 may be provided on the inner cover 2. Specifically, the labyrinth portion 15 may be formed integrally with the inner cover 2, or the labyrinth portion 15 may be formed separately and fixed to the inner cover 2 using an adhesive or the like.

[0126] (Regarding the outer wall) In the above embodiment, the peripheral wall 231A has an elliptical peripheral shape in front view as shown in Fig. 32, i.e., the protrusion 23 has an elliptical peripheral shape in front view. However, this is not limiting. For example, the peripheral wall 231A may be configured so that the peripheral shape in 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 hot air flow detected by the detection element 700 based on the direction in which the hot air flow is supplied.

[0127] (Regarding protrusions) In the above embodiment, the protrusion 23 has been exemplified as having a shape in which the entire protrusion protrudes from the base 200 as shown in Fig. 12, but is not limited to this. For example, any shape is possible as long as it has the function of the above-mentioned step 231, and for example, only a configuration corresponding to the step 231 may be provided on the inner cover 2. In this case, the protrusion 23 in Fig. 12 may have a protruding portion on the periphery corresponding to the step 231, and the inside of the protruding portion may be recessed so that it is at the same height as the base 200.

[0128] (Interpretation of terms) In the above embodiment, the step portion 231 has been described as corresponding to the "regulation structure", but for example, it may also be interpreted that the protrusion 23 including the step portion 231 corresponds to the "regulation structure".

[0129] (About combinations) The features of the above-described embodiment and the features of the modifications may be combined in any manner.

[0130] (Addendum) The fire detection device of Appendix 1 is a fire detection device equipped with a thermal detection element that detects the heat of a hot air flow generated in association with a fire in a monitored area, wherein the thermal detection element is arranged so that its detection portion protrudes from a predetermined base of the fire detection device, has a step portion that is higher than the predetermined base, and is equipped with a control structure that guides the hot air flow to the detection portion of the thermal detection element along the outer peripheral wall of the step portion, and at least a portion of the detection portion of the thermal detection element is located on the base side lower than the top of the step portion.

[0131] The fire detection device of Supplementary Note 2 is the fire detection device of Supplementary Note 1, further comprising a smoke detection unit that detects smoke accompanying a fire, and the control structure has a labyrinth portion in which a plurality of partition walls are arranged to stand from the upper surface of the step along the outer periphery of the step with gaps between them, the labyrinth portion introduces the hot air flow through the gaps to the smoke detection unit provided inside the fire detection device, and supplies the smoke particles contained in the introduced hot air flow to the smoke detection unit, and the labyrinth portion guides the hot air flow to the detection unit of the heat detection element along side ends of the plurality of partition walls that correspond to the outer periphery of the step.

[0132] The fire detection device of Appendix 3 is the fire detection device described in Appendix 2, wherein the hot air flow containing smoke introduced into the labyrinth section is introduced into the smoke detection section arranged at the bottom of the control structure via an opening that penetrates from the upper surface of the step section of the control structure to the lower surface side.

[0133] The fire detection device of Supplementary Note 4 is a fire detection device described in any one of Supplementary Notes 1 to 3, wherein the hot air flow is supplied from the outer periphery of the fire detection device toward its inside, and the peripheral shape of the outer periphery wall of the step portion of the control structure is an ellipse or an oval.

[0134] The fire detection device of Appendix 5 is a fire detection device described in any one of Appendixes 1 to 4, wherein the detection portion of the heat detection element is arranged on the major axis of the ellipse or oval of the step portion of the control structure and outside the outer peripheral wall of the step portion.

[0135] The fire detection device of Appendix 6 is a fire detection device described in any one of Appendixes 1 to 5, in which the detection parts of the heat detection elements are arranged in pairs on the outside of the outer wall of the step portion, facing each other with the control structure in between.

[0136] (Effect of supplementary notes) According to the fire detection device described in Appendix 1, by having a step portion that is higher than a predetermined base portion and being equipped with a control structure that guides a hot air flow along the outer wall of the step portion to the detection portion of the heat detection element, it is possible to reliably guide a hot air flow to the heat detection element, for example.

[0137] The fire detection device described in Appendix 2 is provided with a labyrinth section, which introduces the hot air flow through a gap into the smoke detection section provided inside the fire detection device and supplies the smoke particles contained in the introduced hot air flow to the smoke detection section, and also guides the hot air flow to the detection section of the heat detection element along the side edges corresponding to the outer periphery of the stepped sections of the multiple partition walls, thereby, for example, reliably guiding the hot air flow to the heat detection element and reliably supplying smoke particles to the smoke detection section of the fire detection device, thereby making it possible to improve the accuracy of fire detection.

[0138] According to the fire detection device described in Appendix 3, the hot air flow containing smoke introduced into the labyrinth section is introduced into the smoke detection section located at the bottom of the control structure via an opening that penetrates from the upper surface of the step section of the control structure to the lower surface, thereby making it possible to reliably supply smoke particles to the smoke detection section of the fire detection device, for example.

[0139] According to the fire detection device described in Appendix 4, the hot air flow is supplied from the outer periphery of the fire detection device toward its inside, and the peripheral shape of the outer wall of the step portion of the control structure is an ellipse or an oval, which makes it possible to suppress variation in the temperature of the hot air flow detected by the heat detection element based on the direction in which the hot air flow is supplied, for example.

[0140] According to the fire detection device described in Appendix 5, the detection part of the heat detection element is arranged on the major axis of the ellipse or oval of the step part of the control structure and outside the outer wall of the step part, thereby making it possible, for example, to reliably guide a hot air flow toward the heat detection element using the control structure.

[0141] According to the fire detection device described in Appendix 6, two detection sections of the heat detection elements are arranged on the outside of the outer wall of the step section, facing each other with the control structure in between, thereby making it possible, for example, to suppress variation in the temperature of the hot air flow detected by at least one of the two heat detection elements based on the direction in which the hot air flow is supplied. [Explanation of symbols]

[0142] 1 Outer cover 2 Inner cover 3 Smoke detector cover 5 Smoke detector base 11 Main body 12 Top plate 13 Connection 14 Openings 15 Labyrinth Club 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 part 73 Light Guide 100 sensors 151 Compartment wall 151A side end 152 Gap 200 base 231 Multilayered section 231A Peripheral wall 230 long axis 230A short shaft 300 Detection Space 700 detector element 701 Detector 702 Terminal section 703 Insulating film 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 Reference Line 819 Reference Line 820 Reference Line 821 Reference Line 900 ceiling

Claims

1. A fire detection device provided with a heat detection element that detects the heat of hot airflow generated in association with a fire in a monitoring area, The heat detecting element is arranged so that a detecting portion thereof protrudes from a predetermined base portion of the fire detecting device, a control structure having a step portion that is higher than the predetermined base portion and that guides the hot air flow along an outer peripheral wall of the step portion to the detection portion of the heat detection element; At least a part of the detection portion of the heat detection element is located on a base side lower than the top of the step portion, The fire detection device includes a smoke detection unit that detects smoke associated with a fire, the regulation structure has a labyrinth portion in which a plurality of partition walls are arranged along the outer periphery of the step portion so as to stand from the upper surface of the step portion with gaps between them, The labyrinth portion introduces the hot air flow through the gap to the smoke detection portion provided inside the fire detection device, and supplies the smoke particles contained in the introduced hot air flow to the smoke detection portion, the labyrinth portion guides the hot airflow to the detection portion of the heat detection element along side end portions of the plurality of partition walls corresponding to outer circumferential sides of the step portions. Fire detection equipment.

2. The hot airflow containing smoke introduced into the labyrinth portion is introduced into the smoke detection unit disposed below the control structure via an opening penetrating from the upper surface of the step portion of the control structure to the lower surface side. The fire detection device according to claim 1 .

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