Fire alarm

Abstract

To secure protection performance of main functional components of a fire alarm.SOLUTION: The fire alarm (1) includes a first accommodation portion (11) which defines a first space (S1) for accommodating the fire sensor (42) and which is made of a flame-retardant material, and a second accommodation portion (12) which defines a second space (S2) for accommodating the motion sensor (43) and which is partially made of a non-flame-retardant translucent member (54) for taking in light to be detected by the motion sensor (43) from outside.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to fire alarms. [Background technology]

[0002] Conventionally, fire alarms have been known that are equipped with components (main functional components) such as a fire sensor that performs the main function of detecting smoke, etc., as well as components (auxiliary functional components) such as a human presence sensor that performs auxiliary functions such as detecting people. In relation to this type of fire alarm, for example, Patent Documents 1 and 2 disclose a structure in which a light-transmitting member (light-transmitting cover) is provided in part of a flame-retardant case.

[0003] In addition, in the case of fire alarms, it is sometimes required that the area around the main functional components, such as the fire sensor, be made of flame-retardant materials so that the main functional components can be protected even if a fire or other incident occurs and the fire alarm is exposed to fire. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-67260 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-138968 Summary of the Invention [Problem to be solved by the invention]

[0005] In some cases, the area surrounding auxiliary functional components such as the motion sensor and illuminance sensor is constructed from a non-flame-retardant material that is translucent in order to adjust the amount of light that passes through. In this case, there is a concern that if the non-flame-retardant material catches fire, the fire may spread to the main functional components such as the fire sensor, affecting the main function of the fire alarm, and reducing the protective performance of the main functional components.

[0006] One aspect of the present disclosure has been made in consideration of the above-mentioned problems, and its purpose is to ensure the protection performance of main functional components while providing a non-flame-retardant translucent member. [Means for solving the problem]

[0007] In order to solve the above problem, a fire alarm according to one embodiment of the present disclosure includes a main functional component including a fire sensor and a control device, an auxiliary functional component including a human presence sensor electrically connected to the control device by a wire, a first storage section that defines a first space that houses the main functional component and is made of a flame-retardant material, and a second storage section that defines a second space that houses the auxiliary functional component and is at least partially made of a non-flame-retardant translucent material that is more flammable than the flame-retardant material and that takes in light from the outside that is detected by the human presence sensor. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, it is possible to provide a fire alarm that is equipped with a non-flame retardant translucent member while ensuring protection performance for main functional components. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view showing the appearance of a fire alarm according to an embodiment. [Figure 2] FIG. 2 is a side view showing the appearance of the fire alarm shown in FIG. [Figure 3] FIG. 2 is a perspective view showing a main part of the internal configuration of the fire alarm shown in FIG. [Figure 4] FIG. 4 is an exploded view of the internal configuration shown in FIG. 3. [Figure 5] 2 is a cross-sectional view of the fire alarm shown in FIG. 1 taken along the line AA. [Figure 6] FIG. 2 is a front view showing the appearance of a first modified example of the fire alarm according to the embodiment. [Figure 7] FIG. 7 is a perspective view showing a state in which a light-transmitting member is removed from the fire alarm shown in FIG. 6. [Figure 8] FIG. 7 is a cross-sectional view of the fire alarm shown in FIG. 6 taken along the arrow BB. [Figure 9] FIG. 10 is a perspective view showing the appearance of a second modified example of the fire alarm according to the embodiment. [Figure 10] FIG. 10 is a perspective view showing the appearance of a third modified example of the fire alarm according to the embodiment. [Figure 11] FIG. 10 is a perspective view showing the appearance of a fourth modified example of the fire alarm according to the embodiment. [Figure 12] 12 is a cross-sectional view of the fire alarm shown in FIG. 11 taken along the arrow CC. [Figure 13] FIG. 10 is a perspective view showing the appearance of a fifth modified example of the fire alarm according to the embodiment. [Figure 14] FIG. 14 is a cross-sectional view of the fire alarm shown in FIG. 13 taken along the arrow DD. [Figure 15] FIG. 10 is a perspective view showing the appearance of a sixth modified example of the fire alarm according to the embodiment. [Figure 16] FIG. 16 is a cross-sectional view of the fire alarm shown in FIG. 15 taken along the arrow EE. [Figure 17] FIG. 13 is a side view showing the appearance of a seventh modified example of the fire alarm according to the embodiment. [Figure 18] FIG. 13 is a side view showing the appearance of an eighth modified example of the fire alarm according to the embodiment. [Figure 19] FIG. 13 is a side view showing the appearance of a ninth modified example of the fire alarm according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present disclosure will be described below. Note that the following description is an example of a fire alarm according to the present disclosure, and the technical scope of the present disclosure is not limited to the illustrated example.

[0011] [Configuration of fire alarm] First, the configuration of a fire alarm 1 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a front view showing the appearance of the fire alarm 1 according to this embodiment. Figure 2 is a side view showing the appearance of the fire alarm 1 shown in Figure 1.

[0012] The fire alarm 1 according to this embodiment detects a fire that is a monitoring target and notifies the user. The fire alarm 1, for example, detects a fire and executes an alarm notification operation to notify the user of the occurrence of a fire.

[0013] This fire alarm 1 has a first space S1 partitioned by a flame-retardant member and a second space S2 partially partitioned by a non-flame-retardant translucent member 54, with main functional components such as a fire sensor 42 housed in the first space S1 and auxiliary functional components such as a human sensor 43 housed in the second space S2 (see FIG. 5). Therefore, even if the non-flame-retardant translucent member 54 burns down due to a fire or the like, the fire can be prevented from spreading to the main functional components housed in the first space S1, and the main functional components can be protected.

[0014] In this disclosure, "flame retardant" means having flame retardancy that meets UL Standard No. 94 V-2 or higher. UL Standard No. 94 classifies flame retardancy into six levels: 5VA, 5VB, V-0, V-1, V-2, and HB, in descending order of flame retardancy. Furthermore, in this disclosure, "non-flame retardant" means a property that is relatively more flammable than the aforementioned "flame retardant," and means, for example, having flame retardancy below UL Standard No. 94 V-2.

[0015] As shown in Figures 1 and 2, the fire alarm 1 comprises a box-shaped case 2 and a mounting panel 3 for mounting the case 2 on a wall or the like. The fire alarm 1 according to this embodiment is a wall-mounted type fire alarm that is mounted on a wall or the like inside a building. In the following description, the upward direction when viewed from the front of the fire alarm 1 may be referred to as the upper side, the downward direction when viewed from the front as the lower side, the left side when viewed from the front as the left side, and the right side when viewed from the front as the right side. However, the fire alarm 1 may also be a ceiling-mounted type that is mounted on a ceiling or the like inside a building.

[0016] (case) The case 2 is a box-shaped member made of a flame-retardant synthetic resin or the like. The case 2 is a flame-retardant member that complies with, for example, UL Standard No. 94 V-0, and is made of ABS resin or the like to which a flame retardant has been added. In this embodiment, the case 2 has a substantially circular shape when viewed from the front. However, the case 2 may also have a square, rectangle, other polygonal shape, oval, or the like when viewed from the front.

[0017] In this embodiment, the case 2 includes a main body 21 and a lid 22 that can be opened and closed relative to the main body 21. The main body 21 and the lid 22 are separable from each other. The case 2 is formed by fitting the main body 21 and the lid 22 together.

[0018] When installing the fire alarm 1, the case 2 is attached to a wall or the like via, for example, the mounting panel 3. The main body 21 is a box-shaped member that is open on the front side and is disposed on the back side of the case 2. The lid 22 is a box-shaped member that is open on the back side of the main body 21 and is shallower than the main body 21, and is disposed on the front side of the case 2.

[0019] A first vent hole 23 is formed in the upper part of the right side surface (outer peripheral surface) of the main body 21, for drawing air from the installation environment where the fire alarm 1 is installed into the inside of the case 2. Furthermore, a second vent hole 24 is formed in the upper right part of the front of the lid 22, in a position close to the first vent hole 23, for drawing air from the installation environment into the inside of the case 2. Furthermore, a speaker output hole 25 is formed in the upper center part of the front of the lid 22, for outputting sound from a speaker 44 (see FIG. 3), which will be described later, to the outside of the case 2. Furthermore, a substantially circular opening 26 is formed in the center part of the front of the lid 22, for drawing light from the installation environment into the inside of the case 2. The opening 26 of the lid 22 is closed by a translucent member 54. A fire alarm lamp 27 and a power lamp 28 are arranged in a vertical row to the left of the translucent member 54.

[0020] (Mounting panel) The mounting panel 3 is a plate-like member for mounting the fire alarm 1 (case 2) to a wall surface or the like. The mounting panel 3 is attached to the back side of the fire alarm 1 with screws or the like. In this embodiment, the mounting panel 3 is a substantially rectangular flat plate member and is made of, for example, the same flame-retardant synthetic resin as the case 2. The mounting panel 3 has a protruding portion 31 at the center of the upper end that protrudes above the main body 21. A hook hole 32, which is a vertically elongated through-hole, is formed in this protruding portion 31. The hook hole 32 has a stepped shape with an opening width that is wider at the lower portion than at the upper portion. For example, the fire alarm 1 is mounted to the wall surface or the like by engaging the hook hole 32 with a hook, screw, or the like that protrudes from the wall surface or the like.

[0021] The fire alarm 1 is designed so that a power cord 33 can be accommodated between the case 2 and the mounting panel 3 to supply the power required to operate the fire alarm 1 from a commercial power source or the like. However, the fire alarm 1 may also be operable using a battery such as a lithium battery.

[0022] [Internal structure of a fire alarm] Next, the internal configuration of the fire alarm 1 will be described with reference to Figures 3 to 5. Figure 3 is a perspective view showing the main parts of the internal configuration of the fire alarm 1. Figure 4 is an exploded view of the internal configuration shown in Figure 3. Figure 5 is a cross-sectional view of the fire alarm 1 shown in Figure 1 taken along the line AA.

[0023] 3 to 5, a substrate 4 is disposed inside the case 2. The substrate 4 has a front surface 41A which is the plate surface on the front side of the fire alarm 1, and a back surface 41B which is the plate surface on the rear side of the fire alarm 1. In this embodiment, a fire sensor 42, a human presence sensor 43, a speaker 44, a control unit (control device) 45, etc. are mounted on the front surface 41A of the substrate 4.

[0024] In addition to the above-mentioned components, the substrate 4 is also equipped with multiple electronic components (e.g., light sources for turning on the fire alarm lamp 27 and the power lamp 28), but these electronic components are not shown in the illustration.

[0025] (substrate) The substrate 4 is a printed wiring board, on which a plurality of electronic components are mounted by soldering or the like. The substrate 4 is made of a flame-retardant material that complies with, for example, UL Standard No. 94 V-0. A wiring pattern is formed on the substrate 4 to electrically connect with the electronic components and form an electric circuit. The substrate 4 is disposed inside the main body 21 in a state that is approximately parallel to the rear surface of the main body 21.

[0026] (fire sensor) The fire sensor 42 is a sensor that detects the occurrence of a fire. The fire sensor 42 may be any sensor that can detect the occurrence of a fire, such as a smoke sensor, a carbon monoxide (CO) sensor, or a heat sensor.

[0027] (Humanity sensor) The human presence sensor 43 is an optical sensor that detects the light intensity in the installation environment. The human presence sensor 43 detects the movement of a person or a heat source in the installation environment based on the intensity of light in the installation environment that passes through the light-transmitting member 54 and enters the inside of the case 2. The human presence sensor 43 detects the movement of a person or a heat source by detecting, for example, far infrared rays from a living body. The human presence sensor 43 is mounted on the substrate 4 and is electrically connected to the control unit 45 by wire via the wiring pattern of the substrate 4. When the human presence sensor 43 detects the movement of a person in the installation environment, it outputs a detection signal to the control unit 45.

[0028] (Speaker) The speaker 44 is a loudspeaker that outputs sound to the user. During an alarm notification operation, the speaker 44 outputs an alarm sound to auditorily notify the user of the occurrence of a fire. The sound from the speaker 44 is output to the outside of the case 2 through the speaker output hole 25.

[0029] (Control unit) The control unit 45 controls the overall operation of the fire alarm 1. The control unit 45 is mainly composed of, for example, a microcomputer.

[0030] If the detection signal from the fire sensor 42 exceeds a predetermined level, the control unit 45 causes the fire alarm device 1 to perform an alarm notification operation. Specifically, when the control unit 45 receives a detection signal output from the fire sensor 42, it determines whether or not the level of the detection signal exceeds a predetermined level (threshold value). If it determines that the level of the detection signal exceeds the predetermined level, the control unit 45 causes the fire alarm device 1 to perform an alarm notification operation.

[0031] For example, if it is determined that the level of the detection signal output by the fire sensor 42 exceeds a predetermined level, the control unit 45 turns on the fire alarm lamp 27 and outputs an alarm sound from the speaker 44 to audibly notify the occurrence of a fire.

[0032] Furthermore, the control unit 45 controls the operation of the fire alarm 1 based on the detection signal from the human presence sensor 43. For example, when no human movement is detected by the human presence sensor 43, the control unit 45 turns on the power lamp 28 with a light intensity that is lower than the normal light intensity (i.e., the light intensity when human movement is detected), thereby reducing the power consumption of the fire alarm 1. Furthermore, when human movement is detected by the human presence sensor 43, the control unit 45 may notify another device, such as a mobile terminal, by email or the like that human movement has been detected.

[0033] (Flame-retardant materials) The flame retardant member 53 is a cylindrical member arranged around the human sensor 43. The flame retardant member 53 is made of a flame-retardant light-blocking resin or the like that does not transmit light. The flame retardant member 53 is a flame retardant member that complies with, for example, UL Standard No. 94 V-0, the same as the case 2. The flame retardant member 53 is arranged between the case 2 and the board 4, with one end connected to the case 2 and the other end connected to the board 4. By being arranged around the human sensor 43 mounted on the board 4, the flame retardant member 53 prevents the spread of fire to the main functional components housed in the first space S1, as will be described later.

[0034] (Translucent material) The light-transmitting member 54 is a lid-like member that covers the opening 53f of the inward flange 53c of the flame-retardant member 53. The light-transmitting member 54 is made of a translucent or transparent light-transmitting resin or the like that transmits light. In this embodiment, the light-transmitting member 54 is a non-flame-retardant member made of a white translucent HDPE (high-density polyethylene) or the like that transmits far-infrared rays, so that the far-infrared rays detected by the human presence sensor 43 can be easily taken in from the outside. Because the light-transmitting member 54 is translucent, the inside of the case 2 cannot be seen from the outside through the light-transmitting member 54.

[0035] The light-transmitting member 54 has a curved light-transmitting portion 54a that protrudes on the side opposite to the substrate 4. Light from the installation environment passes through the light-transmitting portion 54a and is taken into the interior of the flame-retardant member 53 and is guided to the human presence sensor 43. An outward flange 54b is provided along the outer periphery of the light-transmitting portion 54a. Radiating from the outward flange 54b are extensions 54c that are accommodated in the accommodation recess 53d of the flame-retardant member 53.

[0036] In this way, in the fire alarm 1, the light-transmitting member 54 is disposed in the opening 26 of the cover 22, and the opening 53f of the flame retardant member 53 is covered by the light-transmitting member 54. In addition, the human presence sensor 43 that detects the light intensity in the installation environment is mounted on the substrate 4 and disposed inside the flame retardant member 53.

[0037] The fire alarm 1 configured as described above includes a first storage section 11 made of a flame-retardant material that defines a first space S1 that houses main functional components such as the fire sensor 42 and the control section 45, and a second storage section 12 that defines a second space S2 that houses auxiliary functional components such as the motion sensor 43, and is partially made of a non-flame-retardant translucent material 54. As a result, the interior of the case 2 of the fire alarm 1 is separated into the first space S1 that houses the main functional components and the second space S2 that houses the auxiliary functional components.

[0038] In this embodiment, the first housing portion 11 is configured by a case 2, a flame retardant member 53, and a substrate 4, each of which is a flame retardant member. The first housing portion 11 defines a first space S1 surrounded by these flame retardant members.

[0039] The second storage section 12 is composed of a light-transmitting member 54, which is a non-flame retardant member, a flame retardant member 53, which is a flame retardant member, and the substrate 4. The second storage section 12 defines a second space S2 (the internal space of the cylindrical flame retardant member 53) surrounded by the non-flame retardant member and the flame retardant member.

[0040] In the fire alarm 1, the main functional components are housed in a first space S1 partitioned by a flame-retardant member, and the auxiliary functional components are housed in a second space S2 partitioned in part by a non-flame-retardant translucent member 54. Therefore, even if the non-flame-retardant translucent member 54 burns down due to a fire or the like, the fire can be prevented from spreading to the main functional components housed in the first space S1, and the main functional components can be protected.

[0041] In this disclosure, "main functional components" refers to electronic components that perform the main functions of the fire alarm 1, such as fire detection and alarm notification. In this embodiment, for example, electronic devices such as the fire sensor 42, speaker 44, and control unit 45 that are directly involved in executing the alarm notification operation correspond to the main functional components. Also, in this disclosure, "auxiliary functional components" refers to electronic components that perform auxiliary functions separate from the main functions of the fire alarm 1, such as fire detection and alarm notification. In this embodiment, for example, electronic devices such as the human presence sensor 43 that are not directly involved in executing the alarm notification operation correspond to auxiliary main functional components.

[0042] It should be noted that the first space S1 only needs to accommodate the main functional components, and may also accommodate auxiliary functional components in addition to the main functional components. For example, auxiliary functional components such as light sources that turn on the power lamp 28 may be accommodated in the first space S1. Even in this case, the object of the present disclosure of preventing the spread of fire to the main functional components accommodated in the first space S1 and protecting the main functional components can be achieved.

[0043] The first space S1 may be further separated into a sensor room in which the fire sensor 42 is disposed and an equipment room in which other electronic components such as the control unit 45 are disposed. For example, the first air vent 23 and the second air vent 24 may be connected to the sensor room, and the air that flows into the sensor room from the first air vent 23 and the second air vent 24 may be guided to the fire sensor 42.

[0044] Furthermore, the case 2 and the flame retardant member 53 may be configured as an integral unit. Specifically, the cover 22 of the case 2 and the flame retardant member 53 may be configured as a single member. This allows the number of parts of the fire alarm 1 to be reduced, and also allows the cover 22 and the flame retardant member 53 to be reliably connected without any gaps.

[0045] In the fire alarm 1 according to this embodiment, both the first storage section 11 and the second storage section 12 are disposed inside the case 2. Specifically, the second storage section 12 is disposed in the center of the case 2, and the first storage section 11 is disposed surrounding the periphery of the second storage section 12. By disposing both the first storage section 11 and the second storage section 12 in a single case 2 in this way, there is no need to provide the second storage section 12 separately from the case 2 in which the first storage section 11 is provided, which makes it easier to simplify the structure of the fire alarm 1. However, as will be described later, the second storage section 12 may be provided separately from the case 2.

[0046] The fire alarm 1 also includes a flame-retardant case 2 that forms the outer shell of the alarm body, and the first storage section 11 is provided in this case 2. This makes it easier to partition the first space S1 inside the case 2 by utilizing the flame-retardant case 2.

[0047] In this disclosure, "outer shell" refers to the flame-retardant exterior (casing) that becomes exposed to the outside of the alarm body when the non-flame-retardant light-transmitting member 54 burns down. In the fire alarm 1 according to this embodiment, the outer shell of the alarm body is made up of the case 2, flame retardant member 53, and substrate 4, each of which is a flame-retardant member. In other words, the fire alarm 1 is an example of a configuration in which the outer shell of the alarm body makes up the first housing 11, and the entire internal space of the outer shell functions as the first space S1. However, it may also be configured so that only part of the internal space of the outer shell functions as the first space S1.

[0048] [Summary of fire alarms] As described above, the fire alarm 1 according to this embodiment includes a main functional component including the fire sensor 42 and the control unit 45, and an auxiliary functional component including the human presence sensor 43 electrically connected by wire to the control unit 45. The fire alarm 1 also includes a first storage section 11 that defines a first space S1 that houses the main functional component and is made of a flame-retardant material, and a second storage section that defines a second space S2 that houses the auxiliary functional component and is at least partially made of a non-flame-retardant translucent material 54 that is more flammable than a flame-retardant material that takes in light (far infrared rays) from the outside that is detected by the human presence sensor 43.

[0049] In the fire alarm 1, the main functional components are housed in a first space S1 partitioned by a flame-retardant member, and the auxiliary functional components are housed in a second housing section 12 partitioned at least in part by a non-flame-retardant translucent member 54. Therefore, even if the non-flame-retardant translucent member 54 burns down due to a fire or the like, the fire can be prevented from spreading to the main functional components housed in the first space S1, and the main functional components can be protected.

[0050] Therefore, according to this embodiment, the non-flame retardant translucent member 54 is provided, and the protection performance of the main functional parts can be ensured.

[0051] [Modification] (First Modification) Fig. 6 is a front view showing the appearance of a fire alarm 1A which is a modified example of the fire alarm 1. Fig. 7 is a perspective view showing the fire alarm 1A shown in Fig. 6 with the light-transmitting member 54 removed. Fig. 8 is a cross-sectional view of the fire alarm 1A shown in Fig. 6 as seen from the arrow BB.

[0052] The fire alarm 1A is a wall-mounted type fire alarm that has a substantially square shape when viewed from the front. As shown in Figures 6 to 8, the fire alarm 1A has a case 2 that does not have an opening 26. The case 2 is a box-shaped member that is open on the back side of the fire alarm 1A, and is arranged to cover the surface 41A of the substrate 4. In addition, the case 2 has a recess 29A in which part of the outer circumferential surface 29 of the case 2 is recessed inward when viewed from the front, and the second storage section 12 is arranged in this recess 29A.

[0053] In the fire alarm 1A, the first storage section 11 is made of a case 2 and a substrate 4, which are flame-retardant members, and defines a first space S1. The second storage section 12 is made of a light-transmitting member 54, which is a non-flame-retardant member, and the case 2 and substrate 4, which are flame-retardant members, and defines a second space S2.

[0054] As in the fire alarm 1A, the second housing section 12 may be provided outside the case 2 and the substrate 4 that constitute the first housing section 11. This makes it possible to effectively prevent the spread of fire to the main functional components housed in the first space S1.

[0055] Also, like fire alarm 1A, case 2 may have recess 29A in which part of outer circumferential surface 29 is recessed inward when viewed from the front, and second storage section 12 may be disposed in recess 29A. This makes it possible to dispose second storage section 12 so that it is integrated with case 2 in appearance, thereby improving the design of fire alarm 1A.

[0056] (Second Modification) Fig. 9 is a perspective view showing the appearance of a fire alarm 1B, which is a modified example of the fire alarm 1. This fire alarm 1B is a wall-mounted type fire alarm. As shown in Fig. 9, in the fire alarm 1B, a second storage section 12 that stores a human sensor 43 is provided on the outer peripheral surface 29 of a case 2 (first storage section 11) outside the case 2 that stores a fire sensor 42 and the like, so as to protrude from the outer peripheral surface 29. This makes it easy to add the second storage section 12 to the outside of the case 2.

[0057] (Third Modification) Figure 10 is a perspective view showing the appearance of a fire alarm 1C, which is a modified example of the fire alarm 1. This fire alarm 1C is a wall-mounted type fire alarm. As shown in Figure 10, the fire alarm 1C has a case 2 (first housing section 11) that houses main functional components such as a fire sensor 42, and a second housing section 12 that houses a human presence sensor 43, which are arranged apart from each other.

[0058] In the fire alarm 1C, the control unit 45 (board 4) housed in the first housing section 11 and the human presence sensor 43 housed in the second housing section 12 may be electrically connected by wire, for example, via wiring 6.

[0059] In this way, in the fire alarm 1C, the second storage section 12 is provided outside the case 2 in which the first storage section 11 is provided, and the case 2 (first storage section 11) and the second storage section 12 are spaced apart. Therefore, with the fire alarm 1C, it is possible to more effectively prevent the spread of fire to the main functional components housed in the first space S1.

[0060] (Fourth Modification) Fig. 11 is a perspective view showing the appearance of a fire alarm 1D, which is a modified example of the fire alarm 1. Fig. 12 is a cross-sectional view of the fire alarm 1D shown in Fig. 11, taken along the arrow CC.

[0061] The fire alarm 1D is a ceiling-mounted type fire alarm that is attached to a ceiling C inside a building. As shown in Figures 11 and 12, in the fire alarm 1D, the case 2 is a box-shaped member that is circular when viewed from the front. The case 2 has a recess 29A in which part of the outer peripheral surface 29 of the case 2 is recessed inward when viewed from the front, and the second storage section 12 is disposed in this recess 29A. In addition, the case 2 has a first air vent 23 and a second air vent 24 formed in the outer peripheral surface 29. The first air vent 23 and the second air vent 24 face each other in the radial direction of the case 2.

[0062] In fire alarm 1D, human sensor 43 and control unit 45 are mounted on front surface 41A of substrate 4. In addition, fire sensor 42 is mounted on rear surface 41B of substrate 4. Therefore, in fire alarm 1D, as shown by the arrows in the figure, air from the installation environment flows into the inside of case 2 through, for example, first air vent 23 and flows out to the outside of case 2 through second air vent 24.

[0063] In a ceiling-mounted fire alarm such as fire alarm 1D, second housing section 12 may be provided outside case 2 and substrate 4 that constitute first housing section 11. This effectively prevents fire from spreading to the main functional components housed in first space S1.

[0064] (Fifth Modification) Fig. 13 is a perspective view showing the appearance of a fire alarm 1E, which is a modified example of the fire alarm 1. Fig. 14 is a cross-sectional view of the fire alarm 1E shown in Fig. 13, taken along the line DD.

[0065] The fire alarm 1E is a ceiling-mounted type fire alarm that is attached to a ceiling C inside a building. As shown in Figs. 13 and 14 , in the fire alarm 1E, the case 2 is a lid-like member that is circular in front view with the back side of the fire alarm 1E open. The case 2 is arranged to cover the center of the front surface 41A side of the substrate 4 that is attached to the ceiling C by a support part 20. In addition, an annular second housing part 12 covered by a light-transmitting member 54 is arranged surrounding the periphery of the outer peripheral surface 29 of the case 2.

[0066] Like the fire alarm 1E, the second storage section 12 may be arranged surrounding the periphery of the outer peripheral surface 29 of the case 2. This allows the second storage section 12 to be arranged around the periphery of the case 2 including the first storage section 11, making it easier to attach the second storage section 12 to the outside of the case 2.

[0067] (Sixth Modification) Fig. 15 is a perspective view showing the appearance of a fire alarm 1F, which is a modified example of the fire alarm 1. Fig. 16 is a cross-sectional view of the fire alarm 1F shown in Fig. 15, taken along the line EE.

[0068] The fire alarm 1F is a ceiling-mounted type fire alarm that is attached to a ceiling C inside a building. As shown in Figures 15 and 16, in the fire alarm 1F, the case 2 is a box-shaped member that is circular in front view with the back side of the fire alarm 1F open. The case 2 is arranged to cover the surface 41A of the board 4. In addition, a substantially annular opening 26A is formed at the outer edge of the front of the case 2 to allow light from the installation environment to enter the inside of the case 2. A ring-shaped light-transmitting member 54 is fitted into this opening 26A from the inside (the substrate 4 side).

[0069] A cylindrical flame retardant member 53 is disposed in the center of the case 2, and main functional parts such as the fire sensor 42 and the control unit 45 are disposed inside the flame retardant member 53.

[0070] As in fire alarm 1F, first housing section 11 and second housing section 12 may be provided in case 2, with first housing section 11 being arranged in the center inside case 2 and second housing section 12 being arranged surrounding the periphery of first housing section 11. In this way, because both first housing section 11 and second housing section 12 are arranged in case 2, there is no need to provide second housing section 12 separately from case 2, which makes it easier to simplify the structure of fire alarm 1F. In addition, because the main functional components are arranged in the center inside case 2, it is easier to protect the main functional components from fires and the like.

[0071] (Seventh Modification) Figure 17 is a side view showing the appearance of a fire alarm 1G, which is a modified example of the fire alarm 1. This fire alarm 1G is a ceiling-mounted type fire alarm. As shown in Figure 17, the fire alarm 1G has a case 2 (first storage section 11) that stores a fire sensor 42 and the like, and a second storage section 12 that stores a human presence sensor 43 is provided in front of the case 2 (first storage section 11) so as to protrude from the front. This makes it easy to add the second storage section 12 to the outside of the case 2.

[0072] (Eighth Modification) Figure 18 is a side view showing the appearance of a fire alarm 1H, which is a modified example of the fire alarm 1. This fire alarm 1H is a ceiling-mounted type fire alarm. As shown in Figure 18, in the fire alarm 1H, a second housing section 12 that houses a human sensor 43 is suspended outside the case 2 (first housing section 11) that houses the fire sensor 42 and the like, on the front side of the case 2.

[0073] In the fire alarm 1H, the control unit 45 (board 4) housed in the first housing section 11 and the human presence sensor 43 housed in the second housing section 12 may be electrically connected by wire, for example, via wiring 6.

[0074] According to the fire alarm 1H, the first housing portion 11 and the second housing portion 12 are arranged apart from each other. Therefore, even if the light-transmitting member 54 constituting the second housing portion 12 burns down, the spread of fire to the main functional components housed in the first space S1 can be effectively prevented. In addition, the second housing portion 12 can be easily attached to the outside of the case 2.

[0075] (Ninth Modification) Figure 19 is a side view showing the appearance of a fire alarm 1I, which is a modified example of the fire alarm 1. This fire alarm 1I is a ceiling-mounted type fire alarm. As shown in Figure 19, in the fire alarm 1I, the second housing section 12 that houses the human sensor 43 is arranged at a distance outside the case 2 (first housing section 11) that houses the fire sensor 42 etc., on the outer peripheral surface 29 side of the case 2.

[0076] In the fire alarm 1I, the control unit 45 (board 4) housed in the first housing section 11 and the human presence sensor 43 housed in the second housing section 12 may be electrically connected by wire, for example, via wiring 6.

[0077] According to the fire alarm 1I, the first housing portion 11 and the second housing portion 12 are arranged apart from each other. Therefore, even if the light-transmitting member 54 constituting the second housing portion 12 burns down, the spread of fire to the main functional components housed in the first space S1 can be effectively prevented. In addition, the second housing portion 12 can be easily attached to the outside of the case 2.

[0078] (Other variations) The fire alarm may be equipped with a communication unit that communicates with a server on a network. The communication method of the communication unit may be a communication standard that is widely used for wireless networks within buildings, such as Wi-Fi (registered trademark).

[0079] The control unit may also determine whether to cause the fire alarm device to issue an alarm based on whether human movement is detected by the human sensor in the installation environment. For example, the control unit may cause the fire alarm device to issue an alarm only when human movement is detected, or may cause the fire alarm device to issue an alarm regardless of whether human movement is detected.

[0080] 〔summary〕 The fire alarm according to aspect 1 of the present disclosure includes a main functional component including a fire sensor and a control device (control unit 45), an auxiliary functional component including a human presence sensor electrically connected to the control device by wire, a first storage section that defines a first space that houses the main functional component and is made of a flame-retardant material, and a second storage section that defines a second space that houses the auxiliary functional component and is at least partially made of a non-flame-retardant translucent material that is more flammable than the flame-retardant material and that takes in light from the outside that is detected by the human presence sensor.

[0081] In the above configuration, the main functional components are accommodated in the first housing made of a flame-retardant material, and the auxiliary functional components are accommodated in the second housing made at least in part of a non-flame-retardant translucent material. Therefore, even if the non-flame-retardant translucent material burns down due to a fire or the like, the fire can be prevented from spreading to the main functional components accommodated in the first housing, thereby protecting the main functional components. Therefore, according to the above configuration, it is possible to ensure the protection performance of the main functional parts while providing a non-flame retardant translucent member.

[0082] The fire alarm according to aspect 2 of the present disclosure is in accordance with aspect 1, and may further include a flame-retardant case that forms the outer shell of the alarm main body in which the first housing section is provided.

[0083] According to the above configuration, by using a flame-retardant case, it is easy to partition the first space inside the case.

[0084] In the fire alarm according to a third aspect of the present disclosure, in the second aspect, the second storage section may be provided outside the case.

[0085] According to the above configuration, the second housing portion is provided outside the case in which the first housing portion is provided, so that it is possible to effectively prevent the spread of fire to the main functional components housed in the first space.

[0086] In a fire alarm according to aspect 4 of the present disclosure, in aspect 3, the case may have a recess in which a portion of the outer surface of the case is recessed inward when viewed from the front, and the second storage section may be arranged in the recess.

[0087] According to the above configuration, it is possible to arrange the second housing portion so that it is integrated with the case in terms of appearance, thereby improving the design of the fire alarm.

[0088] In the fire alarm according to a fifth aspect of the present disclosure, in the third aspect, the second housing section may be disposed so as to surround the periphery of the outer circumferential surface of the case.

[0089] According to the above configuration, the second housing portion is disposed around the periphery of the case including the first housing portion, making it easy to attach the second housing portion to the outside of the case.

[0090] In a fire alarm according to aspect 6 of the present disclosure, in aspect 3, the second storage section may be provided inside the case, the first storage section may be positioned in the center of the case, and the second storage section may be positioned surrounding the first storage section.

[0091] According to the above configuration, since both the first and second housing sections are arranged in the case, there is no need to provide a second housing section separate from the case (the alarm main body), which makes it easier to simplify the structure of the fire alarm. Also, since the main functional parts are arranged in the center of the case, it is easier to protect the main functional parts from fires, etc.

[0092] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the embodiments are also included in the technical scope of the present disclosure. Furthermore, new technical features can be formed by combining the technical means disclosed in the embodiments. [Explanation of symbols]

[0093] 1,1A,1B,1C,1D,1E,1F,1G,1H,1I: Fire alarm 2: Case 4: Circuit board 11: First storage section 12: Second storage section 21: Main body (case) 22: Lid (case) 29: Outer surface 42: Fire sensor 43: Human sensor 45: Control unit (control equipment) 54:Translucent material S1: 1st space S2:Second space

Claims

1. a main functional component including a fire sensor and control device; an auxiliary functional component including a human presence sensor electrically connected to the control device by a wire; a first housing section that defines a first space that houses the main functional components and is made of a flame-retardant material; a second storage section that defines a second space that stores the auxiliary functional component and is at least partially made of a non-flame-retardant translucent material that is more flammable than the flame-retardant material and that takes in light from the outside that is detected by the human presence sensor; Including fire alarms.

2. The fire alarm according to claim 1 , further comprising a flame-retardant case that forms an outer shell of the alarm body in which the first housing portion is provided.

3. The fire alarm according to claim 2 , wherein the second storage section is provided outside the case.

4. the case has a recess in which a part of an outer circumferential surface of the case is recessed inward in a front view, The fire alarm according to claim 3 , wherein the second housing portion is disposed in the recess.

5. The fire alarm according to claim 3 , wherein the second housing portion is disposed around an outer circumferential surface of the case.

6. The second housing portion is provided in the case, The first housing portion is disposed in a central portion inside the case, The fire alarm according to claim 2 , wherein the second housing portion is disposed so as to surround the periphery of the first housing portion.

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