Fire detectors and receivers

Abstract

To suppress contamination of a light transmission part without separately providing a facility for suppressing the contamination of the light transmission part in a device which receives light.SOLUTION: A fire detector 1 comprises: a fire detection section 20 which includes a light-receiving window 22A, receives light via the light-receiving window 22A and detects a fire; and an air duct part 40A which leads outside air to the light-receiving window 22A.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a technique for suppressing contamination of a light transmitting portion. [Background technology]

[0002] There is known a technique for preventing the light receiving glass of a fire detector from being soiled by providing an air tunnel around the fire detector (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6713245 [Patent Document 2] JP 2001-118166 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the techniques described in Patent Documents 1 and 2, it is necessary to provide a wind tunnel around a device that receives light such as a fire detector, in addition to the device.

[0005] An object of the present invention is to prevent the light transmitting portion of a light receiving device from becoming soiled without providing a separate facility for preventing the light transmitting portion from becoming soiled. [Means for solving the problem]

[0006] One aspect of the present invention provides a fire detector comprising a fire detection unit having a light-transmitting portion and receiving light through the light-transmitting portion to detect a fire, and an air tunnel portion that guides outside air to the light-transmitting portion. Effect of the Invention

[0007] According to the present invention, it is possible to prevent the light transmitting portion of the light receiving device from being soiled without providing a separate facility for preventing the light transmitting portion from being soiled. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing an example of a fire detector according to an embodiment. [Diagram 2] FIG. 2 is a bottom view showing an example of a fire detector. [Diagram 3] FIG. 2 is a left side view showing an example of a fire detector. [Figure 4] FIG. 11 is a diagram showing an example of the function of a wind tunnel portion. [Diagram 5] FIG. 11 is a diagram showing an example of the function of a wind tunnel portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the actual dimensions, shapes, and ratios thereof may differ from those shown in the drawings in order to facilitate understanding of the invention. In addition, the x-axis direction, the y-axis direction, and the z-axis direction in the drawings are mutually orthogonal. The -x-axis direction, the -y-axis direction, and the -z-axis direction are opposite to the x-axis direction, the y-axis direction, and the z-axis direction, respectively.

[0010] FIG. 1 is a front view showing an example of a fire detector 1 according to this embodiment. FIG. 2 is a bottom view showing an example of the fire detector 1. FIG. 3 is a left side view showing an example of the fire detector 1. The fire detector 1 detects a fire and notifies an external device (not shown) such as a disaster prevention receiving panel of the occurrence of the fire. The surface of the fire detector 1 becomes soiled by polluting substances such as dust, dirt, earth and sand, vehicle exhaust gas, and chemical substances. The fire detector 1 suppresses this soiling by utilizing external airflow.

[0011] In one example, fire detectors 1 are installed at predetermined intervals on the wall surface of a tunnel for automobile roads to detect a fire that occurs within the tunnel. In the example shown in Fig. 1, the tunnel extends along the x direction in the figure. Automobiles traveling within the tunnel travel along the x direction or -x direction in the figure. The movement of these automobiles generates air currents within the tunnel, mainly in the x direction or -x direction in the figure. The fire detector 1 utilizes the air currents within the tunnel to suppress this contamination.

[0012] As shown in FIG. 1, the fire detector 1 includes a base 10, a fire detection unit 20, test light-emitting units 30A and 30B (hereinafter collectively referred to as "test light-emitting units 30"), and wind tunnel units 40A and 40B (hereinafter collectively referred to as "wind tunnel units 40"). The wind tunnel units 40A and 40B are provided integrally with the fire detector 1. The fire detector 1 is housed in an inner box (not shown) having an opening. The inner box is housed in an outer box (not shown) having an opening. The outer box is fixed to an installation surface. In one example, the outer box is fixed to a wall surface of a tunnel. The fire detector 1 is exposed to the outside from the openings of the inner box and the outer box. It is not necessary for the fire detector 1 to be housed in the inner box and the outer box. The fire detector 1 may be directly fixed to an installation surface such as a wall surface of a tunnel.

[0013] The base 10 is a plate-like member fixed inside the inner box. On the base 10, a fire detection unit 20, a test light-emitting unit 30, and a wind tunnel unit 40 are provided. As shown in FIG. 1, the fire detection unit 20 is disposed in the center of the base 10. The test light-emitting unit 30A is disposed between the end of the base 10 in the -x direction in the figure and the fire detection unit 20. The test light-emitting unit 30B is disposed between the end of the base 10 in the x direction in the figure and the fire detection unit 20. The wind tunnel unit 40A and the wind tunnel unit 40B are disposed side by side along the direction from one entrance of the tunnel to the other entrance (the x direction in the figure). The fire detection unit 20 is disposed between the wind tunnel unit 40A and the wind tunnel unit 40B. The wind tunnel units 40A and 40B are examples of the "first wind tunnel unit" and the "second wind tunnel unit" according to the present invention, respectively.

[0014] The fire detection unit 20 detects a flame by receiving infrared rays emitted by the flame. As shown in Fig. 1, the fire detection unit 20 includes a housing 21, light receiving windows 22A and 22B (hereinafter also collectively referred to as "light receiving windows 22"), and detection elements 23A and 23B (hereinafter also collectively referred to as "detection elements 23").

[0015] The housing 21 houses the detection element 23. The housing 21 is formed of a light-shielding material. The housing 21 protrudes from the base 10 and covers the detection elements 23A and 23B. In one example, the housing 21 has a substantially quadrangular pyramid shape. As shown in FIG. 2, the left and right sides of the housing 21 are both flat surfaces that are inclined with respect to the surface of the base 10.

[0016] The light receiving window 22 allows light emitted from outside the housing 21 to pass inside. The "light" here includes invisible light such as infrared and ultraviolet light, and visible light. The light receiving window 22 is provided in the housing 21. The light receiving window 22 is formed of a material that transmits light, and transmits light. In one example, the light receiving window 32 is a flat glass plate made of glass. As shown in FIG. 2, the light receiving windows 22A and 22B are respectively disposed on the left and right sides of the housing 21 at the ends on the protruding tip side of the housing 21 (z direction in the figure). The light receiving window 22 is an example of a "light transmitting section" or a "first light transmitting section" according to the present invention.

[0017] As shown in FIG. 1, the light receiving windows 22A and 22B are not provided on the left and right side ends of the housing 21 on the protruding base end side (-z direction in the figure). These ends become contact areas 24A and 24B (hereinafter also referred to as "contact area 24"). The contact area 24 is an area that is not used by the fire detection unit 20 to detect a fire. The contact area 24 is located between the air tunnel 40 and the light receiving window 22 in the flow direction of the air guided by the air tunnel 40. The contact area 24 is used to prevent dirt on the air guided by the air tunnel 40 from adhering to the light receiving window 22.

[0018] The detection element 23 is built into the housing 21 and receives light through the light receiving window 22. When the detection element 23 receives infrared rays emitted from the flame, a fire is detected. More specifically, this fire detection is performed by a two-wavelength infrared system or a three-wavelength infrared system. The detection element 23 mainly receives infrared rays from an area of ​​the light receiving window 22 facing the detection element 23 (hereinafter referred to as the "main area"). Therefore, if this main area is soiled, the impact on the fire detection accuracy is greater than if other areas are soiled. Examples of the detection element 23 include a pyroelectric element, a photodiode, and a thermopile. In one example, the detection element 23A receives infrared rays emitted from a detection range in the -x direction in the figure through the light receiving window 22A. The detection element 23B receives infrared rays emitted from a detection range in the x direction in the figure through the light receiving window 22B. The combination of detection element 23A and detection element 23B provides the detection range of fire detection unit 20 of 180 degrees or more.

[0019] The test light-emitting unit 30 irradiates the detection element 23 with test light. The test light is used in a contamination test to check the contamination state of the light-receiving window 22. In addition to the contamination test, the test light may also be used in an operation test to check whether the detection element 23 operates normally. As shown in FIG. 1, the test light-emitting units 30A and 30B each include housings 31A and 31B (hereinafter also collectively referred to as "housings 31"), light-receiving windows 32A and 32B (hereinafter also collectively referred to as "light-receiving windows 32"), and light-emitting elements 33A and 33B (hereinafter also collectively referred to as "light-emitting elements 33").

[0020] The housing 31 accommodates the light emitting element 33. The housing 31 is formed of a light blocking material. The housings 31A and 31B protrude from the base 10 and cover the light emitting elements 33A and 33B, respectively. In one example, as shown in Figs. 1 and 3, the housings 31A and 31B are formed integrally with the air channel portions 40A and 40B, respectively.

[0021] The light receiving window 32 transmits light emitted from inside the housing 31 to the outside. The light receiving window 32 is provided in the housing 31. The light receiving window 32 is made of a material that transmits light and transmits light. In one example, the light receiving window 32 is a flat glass plate made of glass. As shown in FIG. 2, the light receiving windows 32A and 32B are provided on the end faces of the housings 31A and 31B on the fire detection unit 20 side, respectively. The light receiving window 32 is an example of a "second light transmitting section" according to the present invention.

[0022] The light-emitting element 33 is built into the housing 31 and irradiates test light through the light-receiving window 32. The test light irradiated from the light-emitting element 33 passes through the light-receiving window 32, then passes through the light-receiving window 22 of the housing 21, and is irradiated to the detection element 23. An example of the light-emitting element 33 is an infrared light-emitting diode. As shown in FIG. 2, the light-emitting elements 33A and 33B irradiate test light through the light-receiving windows 32A and 32B, respectively. These test lights pass through the light-receiving windows 32A and 32B, respectively, and then pass through the light-receiving windows 22A and 22B, and are irradiated to the detection elements 23A and 23B.

[0023] The air tunnel 40 guides external air to the light receiving window 22 via the contact area 24 of the housing 21. The air tunnel 40A is used to guide the external air to the light receiving window 22A when the external air flows in the x direction in the figure. On the other hand, the air tunnel 40B is used to guide the external air to the light receiving window 22B when the external air flows in the -x direction in the figure. The height of the air tunnel 40 in the z direction is set to a height that does not interfere with the detection of a fire by the detection element 23 so as not to interfere with the fire detection operation of the fire detection unit 20. As shown in FIG. 2, the height of the air tunnel 40 in the z direction is smaller than the height of the housing 21 in the z direction.

[0024] The wind tunnel unit 40A includes a first wind tunnel 41A and a second wind tunnel 42A. As shown in FIG. 1, the first wind tunnel 41A, the second wind tunnel 42A, and the test light-emitting unit 30A are arranged side by side along the y direction in the figure. The y direction in the figure is a direction intersecting with the flow direction of the air guided by the first wind tunnel 41A and the second wind tunnel 42A. The test light-emitting unit 30A is arranged between the first wind tunnel 41A and the second wind tunnel 42A.

[0025] The first wind tunnel 41A has an inlet 43 at the end in the -x direction and an outlet 44 at the end in the x direction, and has a tunnel-like shape penetrating from the inlet 43 to the outlet 44. As shown in Fig. 2, the height of the outlet 44 in the z direction is smaller than the height of the contact area 24A in the z direction.

[0026] As shown in FIG. 1, the passage in the first wind tunnel 41A extends obliquely with respect to the x direction in the figure in a direction that leads more air to the main area of ​​the light receiving window 22A. The center of the contact area 24 in the y direction in the figure is located between the outlet 44 of the first wind tunnel 41A and the main area of ​​the light receiving window 22A in the flow direction of the air led by the first wind tunnel 41A. Therefore, the passage in the first wind tunnel 41A extends obliquely with respect to the x direction in the figure toward the center of this contact area 24. As the passage in the first wind tunnel 41A moves from the inlet 43 toward the outlet 44, it gradually approaches an imaginary line that passes through the center of the contact area 24 and extends in the x direction. The outlet 44 is formed at a position closer to this imaginary line than the inlet 43.

[0027] The passage in the first wind tunnel 41A has a shape that gradually narrows from the inlet 43 toward the outlet 44 in order to increase the flow speed of the air guided by the first wind tunnel 41A. The cross-sectional area of ​​the outlet 44 is smaller than the cross-sectional area of ​​the inlet 43. In one example, the outlet 44 has a smaller width in the y direction in the figure than the inlet 43. Alternatively, the outlet 44 may have a smaller height in the z direction in the figure than the inlet 43.

[0028] A straightening plate (not shown) for uniformly straightening the air flow may be provided in the passage in the first wind tunnel 41A. In one example, the straightening plate has a mesh shape. However, the shape of the straightening plate is not limited to the mesh shape, and may be any shape such as a vertical lattice shape or a perforated shape as long as it can achieve the function of straightening the air flow.

[0029] The second wind tunnel 42A has a similar configuration to the first wind tunnel 41A, but is arranged symmetrically with the first wind tunnel 41A with respect to a virtual line that passes through the center of the fire detection unit 20 in the y direction in the figure and extends in the x direction in the figure. The first wind tunnel 41B and the second wind tunnel 42B have a similar configuration to the first wind tunnel 41A and the second wind tunnel 42A, but are arranged symmetrically with the first wind tunnel 41A and the second wind tunnel 42A with respect to a virtual line that passes through the center of the fire detection unit 20 in the x direction in the figure and extends in the y direction in the figure. Therefore, both the first wind tunnel 41B and the second wind tunnel 42B have an inlet 43 at the end in the x direction and an outlet 44 at the end in the -x direction. In the following description, the first wind tunnels 41A and 41B are collectively referred to as the "first wind tunnel 41", and the second wind tunnels 42A and 42B are collectively referred to as the "second wind tunnel 42".

[0030] 4 and 5 are diagrams showing an example of the action of the wind tunnel section 40. Here, it is assumed that air flows in the x direction in the figure at the installation location of the fire detector 1. For example, when a car runs in the x direction in the vicinity of the fire detector 1, an air flow in the x direction in the figure is formed. At least a part of this air enters the entrance 43 of the first wind tunnel 41A and the second wind tunnel 42A, passes through the passages in the first wind tunnel 41A and the second wind tunnel 42A, and is discharged from the exit 44. As shown in FIG. 1, the passages in the first wind tunnel 41A and the second wind tunnel 42A extend obliquely with respect to the x direction in the figure toward the center of the contact area 24 in the y direction in the figure. Therefore, the air that has passed through the passages in the first wind tunnel 41A and the second wind tunnel 42A is discharged toward the center of the contact area 24A in the y direction in the figure. In addition, the passages in the first wind tunnel 41A and the second wind tunnel 42A gradually narrow from the entrance 43 to the exit 44, so that the flow speed increases.

[0031] As shown in FIG. 4, the air discharged from the outlets 44 of the first wind tunnel 41A and the second wind tunnel 42A collides with the contact area 24A. This collision causes dirt in the air to adhere to the contact area 24. The clean air from which dirt has been removed flows along the surface of the left side of the housing 21 toward the protruding end of the housing 21. Note that "clean" here means that there is less dirt than before the air collides with the contact area 24A, and dirt may be included. At this time, the clean air is blown onto the surface of the light receiving window 22A and comes into contact with the light receiving window 22A. This suppresses adhesion of dirt substances to the light receiving window 22A. In addition, since the clean air is blown especially onto the main area of ​​the light receiving window 22A, adhesion of dirt substances to the main area of ​​the light receiving window 22A is suppressed.

[0032] 4, at least a portion of the outside air flows toward the light-receiving window 22A through the spaces on the z-direction sides of the first wind tunnel 41A and the second wind tunnel 42A. However, as described above, clean air is blown onto the surface of the light-receiving window 22A, so that the dirty air passing through this space is pulled by the clean air flowing over the surface of the light-receiving window 22A and flows above the clean air layer. This clean air layer prevents the dirty air from coming into direct contact with the surface of the light-receiving window 22A, preventing the light-receiving window 22A from being soiled by contact with the dirty air.

[0033] Furthermore, as shown in FIG. 1, the light receiving window 32A of the test light-emitting unit 30A is arranged in line with the outlets 44 of the first wind tunnel 41A and the second wind tunnel 42A along the y direction in the figure. The y direction in the figure is a direction intersecting with the direction in which the air guided by the first wind tunnel 41A and the second wind tunnel 42A flows. Therefore, the light receiving window 32A of the test light-emitting unit 30A is not contacted with the dirty air that has passed through the first wind tunnel 41A and the second wind tunnel 42A. Also, as shown in FIG. 5, the light receiving window 32A of the test light-emitting unit 30A is provided in a recessed location as viewed from the path of the air that flows toward the light receiving window 22A through the space on the z direction side of the first wind tunnel 41A and the second wind tunnel 42A, so it does not come into contact with the dirty air that passes through this space. Therefore, the light receiving window 32A is prevented from being soiled by contact with dirty air.

[0034] The wind tunnel 40B has the same function as the wind tunnel 40A described above. For example, when a car travels near the fire detector 1 in the -x direction in the figure, an airflow in the -x direction in the figure is formed. In this case, the wind tunnel 40B, like the wind tunnel 40A described above, utilizes at least a part of this air to guide clean air to the light receiving window 22B.

[0035] According to the embodiment described above, since the fire detector 1 is provided with the wind tunnel section 40, it is possible to suppress the contamination of the light receiving window 22 of the fire detector 1 without providing a separate facility for suppressing the contamination of the light receiving window 22. Furthermore, since the test light emitting section 30 is arranged alongside the wind tunnel section 40 along a direction intersecting with the flow of air guided by the wind tunnel section 40 and is provided between the first wind tunnel 41 and the second wind tunnel 42, the light receiving window 32 is prevented from being contaminated by contact with the contaminated air that has passed through the first wind tunnel 41 and the second wind tunnel 42. Furthermore, since the contaminated air that has passed through the first wind tunnel 41 and the second wind tunnel 42 collides with the contact area 24 of the housing 21 and the contaminants are removed before contacting the light receiving window 22, it is possible to prevent the light receiving window 22 from being contaminated by contact with the contaminated air that has passed through the first wind tunnel 41 and the second wind tunnel 42. Furthermore, since the wind tunnel sections 40A and 40B are arranged side by side along the x direction in the figure, whether air flows in the x direction or the -x direction inside the tunnel, this air can be used to prevent damage to the light receiving window 22.

[0036] The present invention is not limited to the above-described embodiment. The above-described embodiment may be modified as in the following modified examples. In addition, two or more of the following modified examples may be used in combination.

[0037] In the above-described embodiment, the surface of the contact area 24 may be processed so that contaminants in the air can easily adhere to the contact area 24. In one example, jagged irregularities may be formed on the surface of the contact area 24. In another example, a sheet made of a material to which dirt easily adheres may be added to the surface of the contact area 24. This processing makes it easier for dirt to adhere to the contact area 24 when dirty air collides with the contact area 24, so that cleaner air can be guided to the light-receiving window 22.

[0038] In the above-described embodiment, a recess may be provided in the contact region 24 so that dirt adhering to the contact region 24 is less likely to scatter and move toward the light-receiving window 22. Dirt adhering to the recess in the contact region 24 remains in the recess, and is less likely to move toward the light-receiving window 22. This makes it possible to prevent damage to the light-receiving window 22 caused by dirt adhering to the contact region 24 scattering.

[0039] In the above-described embodiment, in order to enhance the effect of removing dirt from the outside air, a filter for removing dirt from the air may be provided inside the first wind tunnel 41 and the second wind tunnel 42. The filter removes dirt from the air passing through the first wind tunnel 41 and the second wind tunnel 42, so that cleaner air can be guided to the light receiving window 22.

[0040] In the above-described embodiment, the shape of the housing 21 is not limited to a substantially quadrangular pyramid shape. The shape of the housing 21 may be flat, hemispherical, or hemispherical. However, in order to enhance the effect of suppressing the contamination of the light-receiving window 22 by the air channel 40, it is preferable that the housing 21 has a flat surface at least in a portion thereof, and the light-receiving window 22 is provided on the flat surface. Even with the configuration according to this modification, it is possible to suppress the contamination of the light-receiving window 22.

[0041] In the above-described embodiment, the configuration of the fire detector 1 is not limited to the above-described example. The fire detector 1 may be configured to include one or more of the above-described configurations, or may be configured without including some of the configurations. Furthermore, the structure and arrangement of the fire detector 1 are merely examples, and are not limited to these. For example, the number of detection elements 23 is not limited to two, and may be one or three or more. The location where the light receiving window 22 is provided is not limited to the side surface of the housing 21, and may be the top bottom surface.

[0042] In the above-described embodiment, the wind tunnel section 40 may be provided later in an existing fire detector that does not have the wind tunnel section 40. In this case, the wind tunnel section 40 is provided in a position in the existing fire detector where it can guide outside air to the light receiving window. In short, the present invention may provide a wind tunnel device having the wind tunnel section 40. According to this modification, even in an existing fire detector that does not have the wind tunnel section 40, it is possible to suppress the staining of the light receiving window.

[0043] In the above-mentioned embodiment, the fire detector 1 may be installed in a tunnel other than a tunnel for a motorway. Examples of tunnels other than a tunnel for a motorway include a railway tunnel, a construction tunnel, and a pedestrian tunnel. The vehicle traveling in the tunnel is not limited to the above-mentioned automobile, and may be a train or a construction machine. The fire detector 1 may be installed in a place other than a tunnel. Basically, it is preferable that the place where the fire detector 1 is installed has a constant directional air flow. However, if there is no constant directional air flow, for example, a blower may be provided at the installation place of the fire detector 1 so that a constant directional air flow is formed. Even with the configuration according to this modification, the light receiving window 22 can be prevented from being soiled.

[0044] In the above-described embodiment, the fire detection unit 20 is not limited to a unit that receives infrared rays emitted by a flame and detects the flame. In another example, the fire detection unit 20 may detect a fire according to a temperature measured using infrared rays. In this example, the detection element 23 is a radiation temperature sensor, and measures the temperature according to infrared rays received through the light receiving window 22. In yet another example, the fire detection unit 20 may detect a fire by analyzing an image of the surroundings taken by a camera. In this example, the detection element 23 is a small camera, and has an optical system and an imaging element. The imaging element takes an image using light received through the light receiving window 22. This image may be a visible light image or an infrared image. In short, the fire detector 1 may detect a fire using any method or configuration as long as it has a light receiving unit that receives light through the light receiving window 22 and detects a fire using the light received by the light receiving unit. Even with the configuration according to this modification, the light receiving window 22 can be prevented from being soiled.

[0045] The present invention may be applied to a light receiving device other than the fire detector 1. In one example, the light receiving device may be a camera device. The housing of the camera device is provided with a light receiving window 22 and an air tunnel section 40. The camera device has an optical system and an image sensor, and captures an image. This image may be a visible light image or an infrared image. The image sensor captures an image by light received through the light receiving window 22. The image captured by the camera device may be used, for example, for detecting fires, detecting people, or monitoring traffic. The air tunnel section 40 guides outside air to the light receiving window 22. This can prevent the light receiving window 22 from being soiled. The light receiving device is not limited to a camera device, and may be any device as long as it includes the light receiving window 22, a light receiving section that receives light through the light receiving window 22, and an air tunnel section 40 that guides outside air to the light receiving window 22. In short, the present invention may provide a light receiving device including a light transmitting section, a light receiving section that receives light through the light transmitting section, and an air tunnel section that guides outside air to the light transmitting section. The camera device is an example of a "light receiving device" according to the present invention. The imaging element is an example of a "light receiving section" according to the present invention. According to this modification, it is possible to prevent the light receiving window 22 of the light receiving device from being soiled.

[0046] In the above-described embodiment, the fire detection unit 20 does not have to be disposed in the center of the base 10. For example, two fire detection units 20 may be disposed at each of the ends of the base 10 in the x direction and the -x direction in FIG.

[0047] In the above-described embodiment, the light receiving windows 22A and 22B may be provided on the left and right sides of the housing 21, extending over the ends of the protruding base end side (-z direction in the figure) of the housing 21. However, the ends of the light receiving windows 22A and 22B on the protruding base end side of the housing 21 (-z direction in the figure) become contact areas with which air guided by the air tunnel 40 collides, and are not used for fire detection by the fire detection unit 20. Even in the configuration according to this modification, the dirty air that has passed through the first air tunnel 41 and the second air tunnel 42 collides with the ends of the light receiving windows 22A and 22B on the protruding base end side of the housing 21 (-z direction in the figure) to remove dirt before contacting the light receiving windows 22A and 22B, so that the light receiving window 22 can be prevented from being soiled due to contact with the dirty air that has passed through the first air tunnel 41 and the second air tunnel 42.

[0048] In the above-described embodiment, the housing 31A of the test light-emitting unit 30A and the wind tunnel unit 40A, and the housing 31B of the test light-emitting unit 30B and the wind tunnel unit 40B do not necessarily have to be formed integrally. For example, the test light-emitting units 30A and 30B may be provided separately at the ends in the z direction or the -z direction in FIG. 2 with respect to the light-receiving windows 22A and 22B so as to protrude from the light-receiving windows 22A and 22B, respectively. Even with the configuration according to this modification, the wind tunnel unit 40 can prevent the light-receiving window 22 from being soiled, and the test light-emitting unit 30 can perform a soiling test. [Explanation of symbols]

[0049] 1: fire detector, 10: base, 20: fire detection section, 21: housing, 22: light receiving window, 23: detection element, 24: contact area, 30: test light emitting section, 31: housing, 32: light receiving window, 33: light emitting element, 40: wind tunnel section, 41: first wind tunnel, 42: second wind tunnel

Claims

1. A fire detection unit having a first light-transmitting portion and receiving light through the first light-transmitting portion to detect a fire; an air channel portion that introduces outside air into the first light transmitting portion; a test light-emitting unit having a second light-transmitting portion different from the first light-transmitting portion and irradiating the fire detection unit with test light through the second light-transmitting portion; The wind tunnel section and the test light emitting section are arranged side by side along a direction intersecting the flow direction of the air guided by the wind tunnel section. Fire detector.

2. The wind tunnel unit includes a first wind tunnel and a second wind tunnel, The test light emitting unit is disposed between the first wind tunnel and the second wind tunnel.

2. The fire detector of claim 1.

3. The fire detection unit has a housing protruding from an installation surface, The first light transmitting portion is provided on a side surface of the housing, The air tunnel portion guides the air to the first light transmitting portion via a region on a side surface of the housing that is not used by the fire detection portion for detecting the fire. A fire detector according to claim 1 or 2.

4. The wind tunnel portion includes a first wind tunnel portion and a second wind tunnel portion, The first wind tunnel section and the second wind tunnel section are arranged side by side along a direction from one opening to the other opening of a tunnel in which the device is installed, The fire detection unit is disposed between the first wind tunnel unit and the second wind tunnel unit. A fire detector according to any one of claims 1 to 3.

5. The air tunnel portion has a passage therein through which the air passes, The passage extends in a direction to guide more of the air to a region of the first light transmitting portion facing the fire detection portion than to other regions, and has a shape that gradually narrows from the air inlet toward the air outlet. A fire detector according to any one of claims 1 to 4.

6. A first light transmitting portion; a light receiving portion that receives light through the first light transmitting portion; an air channel portion that introduces outside air into the first light transmitting portion; a test light-emitting unit that has a second light-transmitting unit different from the first light-transmitting unit and irradiates the light-receiving unit with test light through the second light-transmitting unit; The wind tunnel section and the test light emitting section are arranged side by side along a direction intersecting the flow direction of the air guided by the wind tunnel section. Light receiving device.

Images