Detection device

Abstract

To provide a detection device capable of rapidly sensing a combustion product to be diffused in the neighborhood of a ceiling surface (lower side of a ceiling part) and also capable of detecting a signal of a fire.SOLUTION: A detection device 1 comprises: a combustion product introduction part 34 having openings 34a communicating with outer and inner sides formed thereon; a device body 2 including a fan 22 connected to the combustion product introduction part 34 so as to suck a combustion product (s) to the combustion product introduction part 34, and a combustion product sensing part 23 for sensing the combustion product (s) sucked by the fan 22; and an arrangement part for arranging the openings 34a on a lower side of a ceiling part b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a portable detection device capable of detecting fires and fire precursors. [Background technology]

[0002] Conventionally, fires have occurred during construction or in factories due to work involving the handling of fire or highly flammable materials, such as welding or paint spraying. In order to reduce fire damage, fire alarm systems are known that detect and alert fires by sucking in smoke through a sampling tube (see Patent Document 1 below).

[0003] Also known is a portable fire detection and extinguishing device that includes a fire detector attached to a support member formed in an inverted U-shape and a fire extinguishing agent tank, and that can be moved on wheels (see Patent Document 2 below).

[0004] In existing buildings, the fire detectors and residential fire alarms used in existing fire alarm systems are attached to building materials such as ceilings and walls with screws, etc. However, these fire detectors and residential fire alarms are not intended to monitor fires that occur through pinpoint and short-term work as mentioned above (to detect fires when they occur), and the fire alarm systems in question are not intended to be relocated, expanded, or removed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 5-325063 [Patent Document 2] JP 2020-185256 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, at construction sites, fire detectors (hereinafter sometimes referred to as "sensors") cannot be installed when building materials such as ceilings and walls have not yet been installed because construction work is in progress, and even if the building materials have already been installed, there is a possibility that the building materials may be damaged or stained, so sensors, etc. cannot be installed indiscriminately.

[0007] Furthermore, the portable fire detection and extinguishing device of Patent Document 2 has the problem that if the support member is extended high to detect smoke, etc. near the ceiling, the device itself becomes unbalanced and becomes unstable.

[0008] In addition, as interior construction progresses, partition walls, ceilings, and other shielding materials are installed according to the section, so the sensors originally installed are no longer sufficient or cannot be used. As a result, sensors and other equipment are frequently added, relocated, or removed as construction progresses, and it is difficult and costly to temporarily attach fire monitoring sensors to building materials under construction and operate them as temporary structures.

[0009] Similarly, in a factory, when a specific short-term work such as welding or paint spraying is performed using fire or highly flammable materials, it is difficult and costly to install and operate a fire monitoring sensor at the work site for the duration of the work. Also, there is no guarantee that a fire monitoring sensor will be installed in the vicinity of the short-term work.

[0010] On the other hand, the combustion products generated by a fire rise due to the rising air current caused by the fire and spread to the vicinity of the ceiling. For this reason, even if a sensor for detecting a fire is installed at a low position such as the floor, it is not effective in detecting the occurrence of a fire or a precursor of a fire, so it is more effective to install it at a higher position such as near the ceiling. Combustion products refer to products such as smoke, carbon monoxide, carbon dioxide, ethylene, formaldehyde, and other gases generated by the combustion of organic matter. Combustion products include those generated from the point of temperature rise before the combustion of organic matter. A fire is a state in which combustion products are generated by flaming combustion in which combustible materials are heated and smoldered or flamed. A precursor of a fire is the point of temperature rise of combustible materials and the generation of combustion products before a fire occurs.

[0011] In addition, smoke is generated in the early stages of a fire, but because the heat generated by the fire source is low and the airflow speed is slow, existing smoke detectors, which are a type of fire alarm, have insect screens to protect against insects and labyrinth structures to protect against disturbance light, and there is a risk that smoke with a slow flow speed will take time to reach the sensor that detects the smoke. Furthermore, at construction sites, there is no obstruction until the interior and exterior walls and windows, including window glass, are installed, so the site is well ventilated, and smoke from a fire spreads easily, making it difficult for the smoke concentration to increase to a level that can be detected.

[0012] Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and provides a detection device that can detect combustion products diffusing near the ceiling surface (below the ceiling portion) at an early stage and can detect precursors of a fire. [Means for solving the problem]

[0013] In order to achieve the above object, the present invention employs the following means. That is, the detection device of the present invention comprises an apparatus main body having a combustion product introduction section with an opening communicating with the inside and outside, a fan connected to the combustion product introduction section and sucking combustion products into the combustion product introduction section, and a combustion product detection section capable of detecting the combustion products sucked in by the fan, and a positioning section that positions the opening below the ceiling section.

[0014] In the detection device configured in this way, the combustion products are sucked in by the fan and can be detected by the combustion products sensor. Therefore, the combustion products that diffuse near the ceiling surface (below the ceiling) can be detected by the combustion products sensor at an early stage, making it possible to detect a fire and its precursors. In addition, "locating the combustion product introduction section below the ceiling" means having a function to fix the opening of the combustion product introduction section so that it is located within 0.5 m from the ceiling, for example.

[0015] In the detection device according to the present invention, the combustion product introduction section may be configured at least in part by a cylindrical hollow member, and a lower end side of the hollow member may be connected to the device body.

[0016] In the detection device configured in this manner, at least a portion of the combustion products introduction section is formed of a cylindrical hollow member, and the lower end of the hollow member is connected to the device body, so that the combustion products can be detected early by the combustion products detection section through the hollow member.

[0017] In the detection device according to the present invention, the opening may be formed on the other side of the upper end of the hollow member.

[0018] In the detection device thus configured, the opening is formed on the upper end side of the hollow member.

[0019] In the detection device according to the present invention, the hollow member may be extendable and contractable in a longitudinal direction.

[0020] In the detection device configured in this manner, the hollow member is expandable in the longitudinal direction. Therefore, when the detection device is not in use, the hollow member can be contracted to store it compactly, and when the detection device is in use, the hollow member can be extended. Therefore, the detection device is easy to move and can be used for fixing objects of different heights, which is convenient. The position of the opening through which the combustion products are introduced can be adjusted according to the length of the hollow member.

[0021] In addition, in the detection device according to the present invention, the hollow member may be expandable and contractible in the vertical direction, and an upper end of the hollow member may extend until the combustion product introduction portion abuts against the ceiling portion.

[0022] In a detection device configured in this manner, the hollow member is fixed and tensioned between the ceiling and the device body, so there is no need to fix the hollow member itself with any other member, and the hollow member can be extended to position the opening below the ceiling.

[0023] In addition, the detection device of the present invention comprises a device main body having an opening communicating with the inside and outside, a fan that draws in combustion products through the opening, and a combustion product detection unit that can detect the combustion products drawn in by the fan, and a positioning unit that positions the opening below the ceiling.

[0024] In a detection device configured in this manner, the combustion products are sucked into the combustion products sensing section by the fan. The opening is located below the ceiling section by the arrangement section. Therefore, the combustion products that diffuse near the ceiling surface (below the ceiling section) can be detected early by the combustion products sensing section, and a fire or its precursor caused by combustion products rising due to updrafts can be monitored. Effect of the Invention

[0025] The detection device according to the present invention can detect combustion products diffusing near the ceiling surface (below the ceiling) at an early stage, and can also detect precursors of a fire. [Brief description of the drawings]

[0026] [Figure 1] 1 is a schematic diagram showing a detection device according to a first embodiment of the present invention; [Diagram 2] FIG. 4 is a schematic diagram showing a detection device according to a second embodiment of the present invention. [Diagram 3] FIG. 11 is a schematic diagram showing a detection device according to a third embodiment of the present invention. [Figure 4] FIG. 13 is a schematic diagram showing a detection device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] First embodiment A detection device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a detection device according to a first embodiment of the present invention. As shown in FIG. 1, the detection device 1 includes a device body 2 and a hollow member 3.

[0028] The device main body 2 has a housing section 21, a fan 22, a combustion product sensor section 23, a control section 24, a display section 25, and a power supply section 26.

[0029] The housing unit 21 houses functional components such as a fan 22, a combustion product sensor 23, a control unit 24, a display unit 25, and a power supply unit 26. The housing unit 21 is placed on an installation surface a such as a floor surface.

[0030] The fan 22 draws combustion products such as smoke, which will be described later, from a combustion product introduction portion 34 of the hollow member 3 through the hollow member 3 into the housing portion 21 .

[0031] The combustion products sensing unit 23 outputs information related to the concentration of the combustion products that have flowed into the housing unit 21 to the control unit 24. "Information related to the concentration of the combustion products" is a concept that includes the physical quantity of the concentration of the combustion products itself, and a physical quantity that changes depending on the concentration of the combustion products.

[0032] For example, combustion product sensing unit 23 may be a smoke sensing unit and include a light-emitting unit (not shown) and a light-receiving unit. The light-emitting unit irradiates light onto the combustion products introduced into housing unit 21. The light-receiving unit receives light that is irradiated from the light-emitting unit toward the combustion products and scattered by the combustion products. Based on the light received by the light-receiving unit, combustion product sensing unit 23 outputs the amount of received light to control unit 24 as information related to concentration.

[0033] The combustion product sensing unit 23 may be a sensing unit capable of detecting each component of the combustion products other than smoke; for example, carbon monoxide is detected by a carbon monoxide sensor, ethylene is detected by an ethylene sensor, etc., and may take any appropriate form, such as an electrochemical type, a semiconductor type, an infrared type, etc. Furthermore, the combustion product sensing unit 23 may be a sensing unit that combines sensing units capable of detecting a plurality of combustion products.

[0034] The control unit 24 performs overall control of the device main body 2. The control unit 24 is connected to the combustion product sensing unit 23 and the display unit 25. The control unit 24 controls the device main body 2 based on a program stored in a recording unit (not shown) such as a storage or memory in the hardware configuration of the control unit 24, for example, to detect a fire and a fire precursor. When information related to the concentration of the combustion products input from the combustion product sensing unit 23 is higher than a threshold value recorded in the recording unit, the control unit 24 judges that a fire has occurred or that a fire precursor has occurred and sends a display signal to the display unit 25. In this application, a fire is defined as a state in which a combustible material or the like is heated and a combustion product is generated by flaming combustion that causes smoldering or flames. Before the fire occurs, the time when the temperature of the combustible material or the like rises or combustion products are generated is defined as a fire precursor.

[0035] The display unit 25 outputs a signal from the control unit 24 to the outside in the form of a color or sound. When the display unit 25 receives a display signal, it turns on a predetermined indicator lamp. The indicator lamp is attached to the outer surface of the housing unit 21 so as to be visible from the outside, and may be configured to flash red, for example, when a fire or a precursor to a fire is detected. In addition, the display unit 25 may be configured to emit a warning sound such as a siren as an alarm sound output unit instead of blinking an indicator lamp, and the warning sound may be changed depending on the detection of a fire or a precursor to a fire. In addition, the display unit 25 and the alarm sound output unit may be configured to notify the occurrence of a fault condition other than that related to a fire, such as a malfunction or dead battery, in a manner different from the above-mentioned display and alarm sound, for example by flashing the indicator lamp in yellow or emitting an alarm sound such as "A fault has occurred." Furthermore, the display unit 25 may be configured to indicate that the detection device 1 is operating normally, for example by lighting an indicator lamp in green when the above-mentioned fire-related condition or fault condition is not occurring.

[0036] The control unit 24 may be configured to wirelessly transmit an output signal from the control unit 24 to a pre-registered PC, smartphone, tablet terminal, etc. by connecting the device main body 2 to a communication device (not shown).

[0037] The power supply unit 26 supplies power to the fan 22, the combustion product sensing unit 23, and the control unit 24. Note that the power supply unit 26 may be a storage battery or the like instead of supplying power from an external source. This makes it possible to operate the detection device 1 even in places without an external power source.

[0038] The hollow member 3 is configured in a cylindrical shape that is expandable and contractable in the vertical direction, which is the longitudinal direction, and has a plurality of cylindrical portions 31, 32, and 33. In this embodiment, the hollow member 3 is configured with three cylindrical portions 31, 32, and 33, but the number of cylindrical portions can be set appropriately. The cylindrical portions 31, 32, and 33 are formed from a metal material, a resin material, or the like. If the cylindrical portions 31, 32, and 33 are formed from a resin material, they are lightweight and therefore easy to carry.

[0039] The tubular portions 31, 32, and 33 are formed in a tubular shape. For example, the tubular portions 31, 32, and 33 are cylindrical. The tubular portions 31, 32, and 33 may be rectangular or truncated cones, and may have any shape as long as they can expand and contract in the vertical direction.

[0040] The cylindrical portions 31, 32, and 33 are configured so that the cylindrical portions located at the top have smaller outer diameters and are accommodated within the adjacent cylindrical portions located below. Note that the cylindrical portions 31, 32, and 33 may be configured so that the cylindrical portions located at the top have larger inner diameters and are accommodated within the adjacent cylindrical portions located above. This allows the contact area with the lower surface b1 of the ceiling portion b, which will be described later, to be increased, allowing for stable installation.

[0041] The cylindrical portion 33 can be fixed at a position where it protrudes upward from the cylindrical portion 32, and the cylindrical portion 32 can be fixed at a position where it protrudes upward from the cylindrical portion 31, using a spring member, a pin member, or the like. The cylindrical portion 33 may be fixed at any position above the cylindrical portion 32, and in that case, it is desirable to provide a gap filler (not shown) on the inner peripheral surface of the cylindrical portion 32 so that no gap is generated between the outer peripheral surface of the cylindrical portion 33 and the inner peripheral surface of the cylindrical portion 32.

[0042] At the top of the cylindrical portion 33, one or more openings 34a are formed in the horizontal direction, which communicate with the inside and outside of the cylindrical portion 33. The combustion product introduction portion 34 is formed of the hollow member 3. It is sufficient that at least a part of the combustion product introduction portion 34 is formed of the hollow member 3. The openings 34a of the combustion product introduction portion 34 may be provided in the circumferential direction at the top of the cylindrical portion 33, or may be provided in the axial direction of the cylindrical portion 33. When providing multiple openings 34a in the axial direction, it is more preferable to provide the openings 34a in different opening directions. This makes it easier to suck in combustion products from different directions.

[0043] The cylindrical portion 31 protrudes from the upper surface 21u of the housing portion 21 of the device main body 2, and is fixed by a pressing force with the upper end portion 33u of the cylindrical portion 33 abutting against the lower surface b1 of the ceiling portion b such as a ceiling or a beam. The hollow member 3 is braced between the upper surface 21u of the housing portion 21 and the lower surface b1 of the ceiling portion b. In other words, the hollow member 3 is braced between the upper surface 21u of the housing portion 21 and the lower surface b1 of the ceiling portion b. In this embodiment, the hollow member 3 functions as a positioning portion that positions the combustion product introduction portion 34 below the ceiling portion b in a braced state.

[0044] When combustion products s ​​are generated by a fire, the combustion products s ​​rise and spread near the bottom surface of the ceiling b (approximately 0.5 m from the bottom surface of the ceiling b). The combustion products s ​​are sucked into the hollow member 3 from the combustion product introduction section 34 of the hollow member 3 by the fan 22 of the detection device 1, move downward inside the hollow member 3, and are detected by the combustion product detection section 23. If the information related to the concentration of the combustion products s ​​measured by the combustion product detection section 23 is higher than the threshold value recorded in the recording section, the control section 24 transmits an indication signal to the display section 25 indicating that a fire or a fire precursor has been detected. When the display section 25 receives the indication signal, it lights up a specified indication lamp or emits an alarm sound. An operator can know the occurrence of a fire or a fire precursor by visually checking the display section 25 or listening to the alarm sound.

[0045] In the detection device 1 configured in this manner, the combustion products s ​​are sucked in by the fan 22, and the combustion products s ​​can be detected by the combustion products detection unit 23. Therefore, the combustion products s ​​diffusing near the ceiling part b can be detected by the combustion products detection unit 23 at an early stage, and a fire and its precursors can be detected.

[0046] Moreover, the combustion product introduction section 34 is formed in a cylindrical section located above the cylindrical hollow member 3 which is expandable in the vertical direction. Therefore, when the detection device 1 is not in use, the hollow member 3 can be contracted to store it compactly, and when the detection device 1 is in use, the hollow member 3 can be extended. Therefore, it is easy to move and can be used for fixing objects of different heights, which is convenient.

[0047] Furthermore, since the hollow member 3 is fixed by tension between the ceiling portion b and the device main body 2, there is no need to fix the hollow member 3 itself with any member, and the hollow member 3 can be extended to easily position the opening 34a on the underside b1 of the ceiling portion b.

[0048] It is particularly useful when the height between the installation surface a and the lower surface b1 of the ceiling portion b is, for example, up to about 6 m, which can sufficiently secure the strength of the hollow member 3. The hollow member 3 may be supported by an auxiliary member such as a tripod, and by supporting it, it becomes possible to extend the hollow member even higher, exceeding 6 m.

[0049] Second Embodiment The detection device according to the second embodiment will be described mainly with reference to Fig. 2. In the embodiment described below, configurations corresponding to those in the embodiment described above may be denoted by the same reference numerals and description thereof may be omitted.

[0050] FIG. 2 is a schematic diagram showing a detection device according to a second embodiment of the present invention. As shown in FIG. 2, a detection device 1A according to this embodiment includes a device body 2 and a hollow member 3A.

[0051] The hollow member 3A has a cylindrical shape and includes a fixed hollow portion 35 extending in the vertical direction and a connecting portion 38. The connecting portion 38 is bent in an L-shape from the lower portion of the fixed hollow portion 35 toward the detection device 1A side. The fan 22 is installed on the connecting portion 38 side of the hollow member 3A from the combustion product sensing portion 23, and sucks the combustion products toward the combustion product sensing portion 23 side. The connecting portion 38 may not be L-shaped, and the fixed hollow portion 35 may be directly connected to the upper surface of the detection device 1A. In this case, the fan 22 is provided above the combustion product sensing portion 23 as in the first embodiment, and sucks the combustion products into the combustion product sensing portion 23. The combustion product introduction portion 34 is provided at the upper portion of the hollow member 3A, and has one or more openings 34a formed in the horizontal direction and communicating with the inside and outside of the hollow member 3A.

[0052] Beneath the ceiling portion b, a support member c formed of a light steel frame or the like and supporting the ceiling finishing material is installed in a lattice pattern on a surface substantially opposite the ceiling portion b.

[0053] A fixing part (placement part) 4 is provided at the vertical middle part of the hollow member 3A. The hollow member 3A is detachably fixed to the support material c by the fixing part 4. The fixing part 4 is configured, for example, by a clamp member capable of clamping the support material c from above and below. The clamp member may be manually removable, or may be electrically opened and closed to be removable.

[0054] The combustion product introduction section 34 of the hollow member 3A is disposed above the support material c and below the ceiling portion b. In order to efficiently draw the combustion products s ​​into the hollow member 3A, it is preferable that the combustion product introduction section 34 is disposed immediately below the ceiling portion b, but the combustion product introduction section 34 may be disposed below the support material c.

[0055] In the detection device 1A configured in this manner, the combustion products s ​​are sucked in by the fan 22, and the combustion products s ​​can be detected by the combustion products sensing unit 23. The combustion products introduction unit 34 is fixed near the underside b1 of the ceiling b by the fixing unit 4. Therefore, the combustion products s ​​diffusing near the ceiling b can be sucked in through the opening 34a and detected early by the combustion products sensing unit 23, making it possible to detect a fire and its precursors.

[0056] Moreover, the detection device 1A is detachably fixed to a support material c arranged below the ceiling portion b by a fixing portion 4. Therefore, the detection device 1A can be easily installed and removed.

[0057] Moreover, the second embodiment is useful in cases where the height between the installation surface a and the underside b1 of the ceiling portion b is, for example, 6 m or more, making it difficult to ensure the strength of the hollow member 3 in the first embodiment. Examples of such cases include entrance halls and atrium areas of various buildings, and operating areas of warehouses and factories.

[0058] Third embodiment The detection device according to the third embodiment will be described mainly with reference to Fig. 3. Note that the same configurations as those in the first and second embodiments will be described using the same reference numerals used in the description of each embodiment. FIG. 3 is a schematic diagram showing a detection device according to a third embodiment of the present invention. As shown in FIG. 3, a detection device 1B according to this embodiment includes a device body 2 and a hollow member 3B.

[0059] The hollow member 3B has a winding hollow section 36 and a fixed hollow section 35. The fixed hollow section 35 is fixed by a fixing section 4 provided on the support member c so as to abut against the lower surface b1 of the ceiling section b. The winding hollow section 36 is made of a rubber material that can be unwound and wound by a winding device 37. The winding device 37 can change the length to the bottom end of the fixed hollow section 35 by being unwound and wound. One end of the winding hollow section 36 is connected to the fixed hollow section 35 in which the combustion product introduction section 34 is provided. The other end of the winding hollow section 36 is connected to the device body 2. In addition, the hollow member 3B may have a fixed hollow section 35 and a winding hollow section 36 formed integrally, and a combustion product introduction section 34 may be formed at the tip of the hollow member 3B, or the cylindrical section 33 described in embodiment 1 may be used as the fixed hollow section 35, and the winding hollow section 36 may be connected to the cylindrical section 33.

[0060] In the detection device 1B configured in this manner, the combustion products s ​​are sucked in by the fan 22, and the combustion products s ​​can be detected by the combustion products detection unit 23. Therefore, the combustion products s ​​diffusing near the ceiling part b can be detected by the combustion products detection unit 23 at an early stage, and a fire or its precursor can be detected.

[0061] Furthermore, when the detection device 1B is not in use, the hollow member 3B can be wound up by the winding device 37 either separately from the fixed hollow portion 35 or together with it, so that it can be stored compactly and is easy to carry.

[0062] Moreover, the third embodiment is useful in cases where the height between the installation surface a and the underside b1 of the ceiling portion b is, for example, 6 m or more, making it difficult to ensure the strength of the hollow member 3 in the first embodiment. Examples of such cases include entrance halls and atrium areas of various buildings, and operating areas of warehouses and factories.

[0063] Fourth embodiment A detection device according to the fourth embodiment will be described mainly with reference to Fig. 4. Note that the same configurations as those in the first embodiment will be described using the reference numerals used in the description of the first embodiment. FIG. 4 is a schematic diagram showing a detection device according to a fourth embodiment of the present invention. As shown in FIG. 4, a detection device 1C according to this embodiment includes a device body 2 and a hollow member 3C.

[0064] The hollow member 3C has a hollow member 3A, a combustion product introduction section 34, and a laterally extending hollow member 3D which is a modification of the combustion product introduction section 34. The hollow member 3A is the same member as the cylindrical sections 31, 32, and 33 used in the first embodiment, but the connection configuration to the device body 2 is different from that in the first embodiment. The lower side of the cylindrical section 31 is connected to the side surface of the device body 2 via a connection member, and the lower end of the cylindrical section 31 is supported by a support section e installed on the installation surface a.

[0065] The laterally extending hollow member 3D has a plurality of cylindrical portions 41, 42, and 43. The number of cylindrical portions can be set appropriately. The cylindrical portion 41 is connected to the upper end of the cylindrical portion 33. The cylindrical portions 41, 42, and 43 are arranged with their axes directed horizontally. The inner diameter of the cylindrical portion 42 is larger than the outer diameter of the cylindrical portion 41. The inner diameter of the cylindrical portion 43 is larger than the outer diameter of the cylindrical portion 42. The cylindrical portion 42 is configured to be able to house the cylindrical portion 41 therein and to be able to protrude laterally from the cylindrical portion 41. The cylindrical portion 43 is configured to be able to house the cylindrical portion 41 or the cylindrical portion 42 therein and to be able to protrude laterally from the cylindrical portion 41 or the cylindrical portion 42. The tip of the cylindrical portion 43 is a combustion product introduction portion 34 in which one or more openings 34a are formed in the horizontal direction. One or more openings 34a may be provided in the axial direction.

[0066] After the hollow member 3A extends and the combustion product introduction section 34 abuts against the ceiling section b, the laterally-extending hollow member 3D extends a predetermined length in the horizontal direction from the upper part of the combustion product introduction section 34. Furthermore, if the tip of the laterally-extending hollow member 3D comes into contact with an obstacle d such as a beam or a wall before it extends to the predetermined length, the extension of the laterally-extending hollow member 3D is controlled to stop.

[0067] In the detection device 1C configured in this manner, the combustion products introduction section 34 and the laterally extending hollow member 3D are fixed to the underside b1 of the ceiling section b. Therefore, the combustion products s ​​diffusing near the ceiling section b are sucked into the fan 22 through the hollow member 3C, and the combustion products detection section 23 can detect the combustion products s. Therefore, the combustion products s ​​diffusing near the ceiling section b can be detected early by the combustion products detection section 23, and a fire and its precursors can be detected.

[0068] Furthermore, since the laterally extending hollow member 3D extends horizontally, the combustion products s ​​can be monitored early in a wide horizontal area of ​​the upper space below the ceiling portion b.

[0069] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0070] For example, in the first embodiment, the lower end 31d of the cylindrical portion 31 of the hollow member 3 abuts against the upper surface 21u of the housing portion 21 of the device main body 2, and the upper end 33u of the cylindrical portion 33 abuts against the lower surface b1 of the member constituting the ceiling portion b to be braced, but the present invention is not limited to this. The lower end 31d of the cylindrical portion 31 of the hollow member 3 may be abutted against an installation surface a such as a floor surface to be braced between the lower surface b1 of the ceiling portion b and the installation surface a. In this case, the cylindrical portion 31 may be branched at the middle in the vertical direction, and the device main body 2 may be provided at the tip of the branched portion. In addition, a cushioning material may be provided at the lower end 31d of the cylindrical portion 31 and the upper end 33u of the cylindrical portion 33 to prevent damage to the installation surface a or the lower surface b1 when braced.

[0071] Furthermore, although the hollow member 3 is fixed to the device body 2, the lower end of the tubular portion 31 may be attached to a hole provided on the upper surface of the device body 2 by a screw structure.

[0072] In the second embodiment, the hollow member 3A is detachably fixed to the support c by the fixing portion 4 formed of a clamp member, but the present invention is not limited to this. When the support c is made of a magnetic metal or a magnetic metal is attached to the support c, a magnet may be provided in the hollow member 3A and the hollow member 3A may be fixed to the support c by magnetic force. Alternatively, by making the magnet of the hollow member 3A an electromagnet, it is possible to easily switch between attachment and detachment by switching the current supply. Also, a magnet or electromagnet may be provided on the support c side and a magnetic body may be provided on the hollow member 3A side.

[0073] The fixing portion 4 may be a rivet. In this case, the rivet is attached to the hollow member 3A, and the hollow member 3A may be detachably fixed to the support material c by driving the rivet into a concrete surface or an iron surface of the support material c.

[0074] The fixing part 4 may be a suction cup. In this case, a suction cup is attached to the hollow member 3A, and the suction surface of the suction cup is sucked onto the smooth surface of the support material c by a vacuum pump or the like, thereby detachably fixing the hollow member 3A to the support material c.

[0075] In the second embodiment, the hollow member 3A is detachably fixed to the support member c, but the present invention is not limited to this. The hollow member 3A may be fixed to the lower surface b1 of the ceiling portion b.

[0076] In each embodiment, the upper end of the hollow member 3 does not have to abut against the lower surface b1 of the ceiling portion b. It is sufficient to be able to suck in the combustion products s ​​diffusing near the ceiling surface (below the ceiling) from the combustion product introduction part 34 to the combustion product detection part 23, and in the first and fourth embodiments, by supporting the hollow member with a tripod or the like, it can be installed without abutting on the underside b1 of the ceiling part b, and it is possible to suck in and detect the combustion products s ​​diffusing near the ceiling. Also, in the second and third embodiments, by installing a detection device or hollow member on a member or the like below the underside b1 of the ceiling part b without abutting on it, it is possible to suck in and detect the combustion products s ​​diffusing near the ceiling.

[0077] Also, the device body may be configured to directly suck in the combustion products from an opening communicating with the inside and outside, without including a combustion product introduction section. [Explanation of symbols]

[0078] 1, 1A, 1B, 1C Detection device 2. Device body 3,3A,3B,3C Hollow member 3 Hollow members 3D horizontally expanding hollow member 4 Fixed part (placement part) 22 Fan 23 Combustion product detector 34 Combustion product introduction section 34a aperture b Ceiling section s Combustion products

Claims

1. A combustion product introduction section having an opening communicating with the inside and the outside; Connected to the combustion product introduction section, A device body having a fan that draws combustion products into the combustion product introduction portion and a combustion product detection portion that can detect the combustion products drawn in by the fan; A detection device comprising: a placement portion that places the opening below a ceiling portion.

2. The combustion product introduction section is at least partially constituted by a cylindrical hollow member, The detection device according to claim 1 , wherein a lower end side of the hollow member is connected to the device body.

3. The detection device according to claim 2 , wherein the opening is formed on an upper end side of the hollow member.

4. The detection device according to claim 2 , wherein the hollow member is extendable and contractible in a longitudinal direction.

5. The hollow member is expandable and contractable in the vertical direction, 3. The detection device according to claim 2, wherein an upper end of said hollow member extends until said combustion product introduction section abuts said ceiling section.

6. An opening communicating with the inside and the outside; A device body having a fan that draws in combustion products through the opening and a combustion product sensor that can sense the combustion products drawn in by the fan; A detection device comprising: a placement unit that places the opening below a ceiling portion.

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