Detector

Abstract

To provide a detector not required to be fixed to a specific place or part and capable of surely detecting fires or a sign of fires without making an unexpected operation stop or movement for a prescribed time even in a state where no power is supplied.SOLUTION: This detector comprises a combustion product sensing unit that can sense a combustion product, and can perform fire monitoring based on an operation of the combustion product sensing unit. The detector comprises a time measurement unit 241 that measures operation time of duration of fire monitoring from the start of the fire monitoring, and a control unit 24 that executes control so as not to stop the fire monitoring unless the operation time measured by the time measurement unit 241 exceeds a threshold value.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a detection device that enables early detection of a fire. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in order to prevent fires during construction work, smoke detection suction devices that detect and warn of the outbreak of a fire (see Patent Document 1 below) have been installed at construction sites. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-325063 Summary of the Invention [Problem to be solved by the invention]

[0004] However, at construction sites, it is common that permanent automatic fire alarm equipment that can be used during work is not installed or is not in operation, and as the construction progresses, the environment changes, such as the installation of partition walls and ceilings, making operation itself difficult. In addition, during construction, power source locations are limited, and as the environment changes as mentioned above, power wiring cannot be performed, making it difficult to supply power to the automatic fire alarm equipment. In addition, during construction work, workers may stop or move the automatic fire alarm system because it interferes with their work, which may result in the system not being able to properly detect the combustion products described below.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a detection device that can reliably detect fires and fire precursors for a specified period of time without unexpected shutdowns or movements. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. In other words, the detection device of the present invention is a detection device that has a combustion product sensing unit capable of detecting combustion products and is capable of fire monitoring based on the operation of the combustion product sensing unit, and is equipped with a time measurement unit that measures the operating time, which is the time during which the fire monitoring continues from the start of the fire monitoring, and a control unit that controls the fire monitoring so that it cannot be stopped unless the operating time measured by the time measurement unit exceeds a predetermined threshold value.

[0007] Combustion products are products that are generated when organic matter is burned, such as smoke, carbon monoxide, carbon dioxide, ethylene, formaldehyde, and other gases. Combustion products include those that are generated when the temperature of the organic matter rises before it is burned.

[0008] In the detection device configured in this manner, the control unit controls the device so that fire monitoring cannot be stopped unless the operating time measured by the time measurement unit exceeds the threshold. Therefore, the combustion product detection unit can detect combustion products and continue fire monitoring for a predetermined time until the threshold is reached. Therefore, the device can reliably detect fires and fire precursors for a predetermined time without unexpected operation stoppages. It is desirable that the operating time threshold can be set at each construction site where the detection device is installed. To detect combustion products, it is necessary to use a sensor that can detect each component. For example, a carbon monoxide sensor is used for carbon monoxide, an ethylene sensor is used for ethylene, etc. In this application, sensors that can detect smoke, carbon monoxide, ethylene, and formaldehyde are installed in the detection device. A fire is defined as a state in which combustibles are heated and smolder or flames are produced through flaming combustion, resulting in the generation of combustion products. A fire precursor is defined as a point in time before a fire occurs, when the temperature of combustibles rises or combustion products are generated.

[0009] In addition, the detection device of the present invention may further include a position fixing means for fixing the detection device at an installation position, and the control unit may control the detection device so that the fixation of the detection device by the position fixing means cannot be released unless the operating time measured by the time measurement unit exceeds the predetermined threshold value.

[0010] In the detection device configured in this manner, the control unit controls the detection device so that the fixation of the detection device by the position fixing means cannot be released unless the operating time measured by the time measurement unit exceeds the threshold value. Therefore, the detection device is fixed for a predetermined time until the threshold value is reached, and the combustion product sensing unit detects combustion products, allowing fire monitoring to continue.

[0011] In addition, the detection device of the present invention may further include a combustion product introduction section having an opening communicating with the inside and the outside, and a fan that draws the combustion products into the combustion product introduction section, and the control section may control the fan so that it cannot be stopped unless the operating time measured by the time measuring section exceeds the predetermined threshold value.

[0012] In the detection device configured in this manner, the control unit controls the fan so that it cannot be stopped unless the operating time measured by the time measurement unit exceeds the threshold value. Therefore, the combustion products sensing unit can sense combustion products for a predetermined time until the threshold value is reached, and fire monitoring can be continued.

[0013] In addition, the detection device of the present invention may further include a battery unit that supplies power to the detection device, a power supply unit that supplies electricity from an external power source to the battery unit, and a battery remaining capacity measurement unit, and when operating the detection device, the battery remaining capacity measurement unit may determine whether the remaining battery capacity of the power supply unit is greater than the amount of power consumed by the detection device until the operating time reaches the specified threshold.

[0014] With a detection device configured in this manner, it is possible to flexibly respond to fire monitoring, such as by supplying power to the battery in advance or selecting a location to place the battery, depending on the result of the battery remaining charge determination unit determining the remaining battery charge in the power supply unit. Effect of the Invention

[0015] According to the detection device of the present invention, it is possible to reliably detect fires and fire precursors for a predetermined period of time without unexpected shutdowns or movements. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic diagram showing a detection device according to a first embodiment of the present invention; [Diagram 2] 2 is a block diagram showing an example of the configuration of a control unit of the detection device according to the first embodiment of the present invention. FIG. [Diagram 3] FIG. 4 is a diagram showing the relationship between the concentration of combustion products and the fan rotation speed of the detection device according to the first embodiment of the present invention. [Figure 4] 4 is a diagram showing the relationship between the discharge capacity and voltage of a power supply unit of the detection device according to the first embodiment of the present invention. FIG. [Diagram 5] 5 is a flowchart showing an example of the operation of the detection device according to the first embodiment of the present invention. [Figure 6] FIG. 4 is a schematic diagram showing a detection device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] 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 combustion product introduction section 3. In consideration of the constituent material and strength of the combustion product introduction section 3, this embodiment is preferably applied to cases where the distance from the floor surface to the ceiling surface is less than 6 m. In this embodiment, the combustion product introduction section 3 itself functions as a position fixing means.

[0018] The detection device 1 is composed of a combustion product introduction section 3 and an apparatus main body 2, which has a housing section 21, a fan 22, a combustion product sensing section 23, a control section 24, a display section 25, and a power supply section 26.

[0019] 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 a stable installation surface a such as a floor surface.

[0020] The fan 22 draws the combustion products, such as smoke, into the housing 21 through an opening 34 of the combustion product introduction section 3, which will be described later.

[0021] The combustion products sensing unit 23 outputs information related to the concentration of the combustion products sucked into the housing unit 21 to the control unit 24 as a measurement value of the combustion products sensing unit 23. The information related to the concentration of the combustion products is a concept including the concentrations and physical quantities of the combustion products and various components of the combustion products, and physical quantities that change depending on the concentration of the combustion products.

[0022] For example, the combustion product sensing unit 23 may be a smoke sensing unit, and may include a light emitting unit (not shown) and a light receiving unit. The light emitting unit irradiates light onto the smoke introduced into the housing unit 21. The light receiving unit receives the light irradiated from the light emitting unit towards the smoke and scattered by the smoke. Based on the light received by the light receiving unit, the smoke sensing unit outputs the amount of received light to the control unit 24 as information related to the concentration.

[0023] The combustion product sensing unit 23 may be a sensing unit capable of detecting various components of combustion products other than smoke, and may, for example, be constituted by a carbon monoxide sensor for carbon monoxide and an ethylene sensor for ethylene, 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.

[0024] As a method for measuring smoke concentration, which is an example of the concentration of combustion products, for example, a particle counter method can be adopted. Scattered light caused by irradiation of light from a light-emitting element is detected by a light-receiving element, and a light-receiving pulse signal corresponding to the scattered light (a light-receiving pulse signal of scattered light obtained for each smoke particle from the light-receiving element) is processed to count the number of particles per unit time and convert it into smoke concentration.

[0025] The control unit 24 performs overall control of the device main body 2. The control unit 24 is connected to the fan 22, the combustion product sensing unit 23, the display unit 25, the power supply unit 26, and the fixed unit 27. 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 precursor to a fire. When information related to the concentrations of the combustion products and various components of the combustion products measured by the combustion product sensing unit 23 is higher than a threshold value registered in the recording unit 242, the control unit 24 judges that a fire has occurred or that this is a precursor to a fire and sends a display signal to the display unit 25.

[0026] 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 set to flash yellow, for example, when a fire or a sign of a fire is detected. Moreover, the display unit 25 may emit a warning sound such as a siren instead of blinking an indicator lamp, and may change the warning sound depending on the detection of a fire or a sign of a fire. Also, an alarm may be sounded when the power capacity of the power supply unit 26 falls below a certain value, making it necessary to replace or recharge the battery.

[0027] 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).

[0028] The power supply unit 26 supplies power to the fan 22, the combustion product sensing unit 23, the control unit 24, and the display unit 25. The power supply unit 26 is made up of a battery unit (not shown) which is a storage battery such as a battery, and a power supply unit (not shown) which supplies electricity from an external power source to the battery unit. This makes it possible to operate the detection device 1 even in places where there is no external power source, thereby expanding the range in which it can be installed. The power supply unit 26 can be connected to an AC 100V power source (hereinafter, the power source).

[0029] The combustion product introduction section 3 is composed of a plurality of cylindrical sections 31, 32, and 33, which are expandable and contractible hollow members. In this embodiment, the combustion product introduction section 3 is composed of three cylindrical sections 31, 32, and 33, but the number of cylindrical sections can be set appropriately. In addition, the inner diameter and height of the cylindrical sections can also be changed appropriately.

[0030] The cylindrical portions 31, 32, and 33 are made of a metal material, a resin material, etc. If the cylindrical portions 31, 32, and 33 are made of a resin material, they are lightweight and therefore easy to carry.

[0031] The tubular portions 31, 32, and 33 are, for example, cylindrical in shape. 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.

[0032] The outer diameter of tubular portion 33 is smaller than the inner diameter of tubular portion 32, and the outer diameter of tubular portion 32 is smaller than the inner diameter of tubular portion 31, and the tubular portions located higher have smaller outer diameters and are configured to be stored within the adjacent lower tubular portions.

[0033] The cylindrical portion 33 can be fixed at a position protruding upward from the cylindrical portion 32, and the cylindrical portion 32 can be fixed at a position protruding 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.

[0034] The cylindrical portion 31 is fixed to an upper surface 21u of the housing portion 21 of the device body 2 so as to protrude upward, and a lower end portion thereof communicates with the fan 22 in the housing portion 21.

[0035] At the top of the cylindrical portion 33, a plurality of openings 34a communicating with the inside and outside of the cylindrical portion 33 are formed in one or more locations in the circumferential and / or axial directions. The openings 34a are desirably open in the horizontal direction, but the openings can be arbitrarily set according to the usage environment and detection conditions of the detection device 1, for example, opening downward so that the combustion products rising from below due to the updraft are easily sucked into the combustion product introduction portion 3.

[0036] The combustion product introduction section 3 is fixed by a pressing force in an extended state, that is, in a state where it protrudes from the upper surface 21u of the housing part 21 and the upper end part 33u abuts against the lower surface b1 of the ceiling member b. In other words, the combustion product introduction section 3 is braced between the upper surface 21u of the housing part 21 and the lower surface b1 of the ceiling member b. In this embodiment, the combustion product introduction section 3 functions as a positioning section that fixes the detection device 1 to an installation position so that the opening 34 is positioned below the ceiling member b in a braced state. Furthermore, the combustion product introduction section 3 itself functions as a position fixing means so that the position of the entire detection device 1 is fixed by the respective pressing forces generated by the upper end portion 33u abutting against the underside b1 of the ceiling member b and the bottom surface of the detection device 1 abutting against the installation surface.

[0037] When combustion products s ​​are generated by a fire, the combustion products s ​​rise and propagate to the vicinity of the underside b1 of the ceiling member b. The combustion products s ​​are sucked into the combustion products introduction section 3 through the opening 34 of the combustion products introduction section 3 by the fan 22 of the detection device 1, move downward inside the combustion products introduction section 3, and are detected by the combustion products detection section 23. When information related to the concentration of the combustion products s ​​measured by the combustion products detection section 23 is higher than the threshold value registered in the recording section, the control section 24 transmits an indication signal to the display section 25 indicating that a fire or a precursor has been detected. When the display section 25 receives the indication signal, it lights up a specified indication lamp or emits an alarm. Users and construction personnel can know the occurrence of a fire or a precursor of a fire by visually checking the display section 25 or listening to the alarm sound.

[0038] In the detection device 1 configured in this manner, the combustion products s ​​are sucked up to the combustion products sensing unit 23 by the fan 22, and the combustion products s ​​propagating near the underside b1 of the ceiling member b are detected by the combustion products sensing unit 23, making it possible to detect a fire or a precursor to a fire. In other words, if the fan 22 does not operate properly, the combustion products s ​​cannot be sucked up to the combustion products sensing unit 23 via the combustion products introduction unit 3, and a fire or a precursor to a fire cannot be detected.

[0039] Next, the configuration of the control unit 24 will be described in detail. FIG. 2 is a block diagram showing an example of the configuration of the control unit 24. As shown in FIG. As shown in FIG. 2, the control unit 24 has a time measurement unit 241, a recording unit 242, a time determination unit 243, a combustion product concentration determination unit 244, a length measurement unit 245, a length determination unit 246, a drive unit 247, a battery remaining capacity measurement unit 252, and a warning signal transmission unit 253.

[0040] The time measurement unit 241 measures the operation time, which is the time during which the fire monitoring continues from the start of the fire monitoring. The time measurement unit 241 measures the operation time according to the rotation speed of the fan 22.

[0041] In addition, when an operator operates a switch (not shown) to input an operation to stop the detection device 1, the time determination unit 243 compares the operating time with a predetermined threshold value, which is preset in the recording unit 242 as the time for which the detection device 1 should continue fire monitoring, and if the operating time of the detection device 1 does not meet the predetermined threshold value, it disables the effect of the switch.

[0042] In addition, in the detection device 1, the combustion product introduction section 3 functions as a position fixing means for fixing the detection device 1 to the installation position, and a fixing section 27 described later functions as a position fixing means and fixes the combustion product introduction section 3. The time determination section 243 periodically or at any time compares the operation time with a predetermined threshold value set in advance in the recording section 242 as the time for which the detection device 1 should continue fire monitoring, and if the operation time of the detection device 1 does not meet the predetermined threshold value, the fixing section 27 fixes the position fixing means, and the detection device 1 is controlled so that the position fixation cannot be released, and it cannot be moved from the installation position.

[0043] Furthermore, the time determination unit 243 compares the operation time of the fan 22 measured by the time measurement unit 241 with a threshold value for the operation time of the fan 22 set in advance in the recording unit 242, and if the operation time of the fan 22 is equal to or less than the predetermined threshold value, determines to continue the operation of the fan 22. If the operation time of the fan 22 exceeds the predetermined threshold value, the time determination unit 243 determines to stop the operation of the fan 22. Note that the predetermined threshold value for the operation time is desirably determined for each construction site.

[0044] The combustion products concentration determination unit 244 compares the information related to the combustion products concentration measured by the combustion products sensing unit 23 with a threshold value for information related to the combustion products concentration registered in advance in the recording unit 242. When the information related to the combustion products concentration is equal to or lower than the registered threshold value, the combustion products concentration determination unit 244 determines that the fan 22 may be driven in an intermittent operation. When the information related to the combustion products concentration is higher than the registered threshold value, the combustion products concentration determination unit 244 determines that the fan 22 should be driven in a continuous operation.

[0045] In the length measurement unit 245, relationship information regarding the length and inner diameter of the combustion product introduction section 3 and the rotation speed of the fan 22 to be set is registered in advance. The length measurement unit 245 measures the length L (see FIG. 1) and inner diameter of the expandable combustion product introduction section 3. For example, a measuring device such as a linear encoder or a laser range finder is provided in the combustion product introduction section 3, and the length measurement unit 245 receives length information transmitted from the measuring device. In addition, the inner diameter of the combustion product introduction section 3 is registered in the length measurement unit 245 as a previously measured value.

[0046] Based on the length information of the combustion product introduction section 3 received by the length measurement section 245, the length determination section 246 checks the rotation speed of the fan 22 that corresponds to the length information that is preset in the recording section 242. The recording section 242 is set so that, when the fan 22 is rotated at high speed during intermittent operation of the fan 22, the rotation speed of the fan 22 becomes faster as the length of the combustion product introduction section 3 becomes longer.

[0047] The driving unit 247 controls the driving of the fan 22. When the time determination unit 243 determines that the operation of the fan 22 should be continued, the driving unit 247 continues the driving of the fan 22. When the time determination unit 243 determines that the driving of the fan 22 should be stopped, the driving unit 247 stops the driving of the fan 22.

[0048] FIG. 3 is a graph showing the relationship between the concentration of combustion products and the rotation speed of the fan 22. As shown in FIG. When the combustion product concentration determination unit 244 determines that the fan 22 may be driven in intermittent operation, the drive unit 247 drives the fan 22 in intermittent operation. In the intermittent drive of the present invention, for example, the high-speed drive time may be set to be longer than the low-speed drive time. In addition, in a low-speed state, the fan 22 may be stopped instead of being driven at a low speed. When the combustion product concentration determination unit 244 determines that the fan 22 should be driven in continuous operation, the drive unit 247 drives the fan 22 continuously at a high speed. In addition, the rotation speed of the fan 22 when the combustion product concentration determination unit 244 determines that the fan 22 should be driven continuously may be faster than the rotation speed of the fan 22 in normal intermittent operation.

[0049] The battery level measurement unit 252 measures the remaining battery level of the power supply unit 26. For example, taking the amount of battery that can operate the fan 22 for about 2 hours as a threshold value, if it is less than that, the warning signal transmission unit 253 transmits a warning signal to the display unit 25. When receiving the warning signal, the display unit 25 displays a recognizable display such as a warning lamp. Also, when receiving the warning signal, the display unit 25 may emit a warning sound indicating that the remaining battery level is low. The threshold value of the remaining battery level of the power supply unit 26 for emitting a warning signal can be set as appropriate.

[0050] When operating the detection device 1, the battery level measurement unit 252 determines whether the remaining battery level of the power supply unit is greater than the amount of power consumed by the detection device 1 before the operating time reaches a predetermined threshold value.

[0051] The threshold value may be corrected according to the temperature of the space where the device main body 2 is installed. When the air temperature at the installation location of the device main body 2 is low, since the battery consumption is fast, the threshold value may be set higher.

[0052] An example of a method for checking the battery capacity for a predetermined operating time is shown. FIG. 4 is a diagram showing the relationship between the discharge capacity and voltage of the power supply unit. As shown in FIG. 4, when the power supply unit is a lithium battery, the internal voltage of the lithium battery decreases as the temperature drops. For this reason, the discharge capacity until the discharge stop line is reached decreases. Although the characteristics vary for each battery model, as an example, it is 2900 mAh at 45°C or higher, 2750 mAh at 25°C, 2550 mAh at 0°C, and 2450 mAh at -10°C. Measure the relationship between the battery voltage and the discharge capacity at each temperature (in 5°C steps) during design and register it in advance in the recording unit 242 of the device main body 2. Define the total amount of current X for operating the device main body 2 for a predetermined time during design. Obtain the current temperature and the current battery voltage, and measure the total amount of current Y discharged from full charge to the present based on the "relationship between battery voltage and discharge capacity" registered in the recording unit 242. Based on the current temperature, obtain the discharge capacity Z at full charge. It is determined whether discharge for a predetermined time is possible depending on whether X + Y + α (margin) < Z is satisfied. It is advisable to check similarly when using other types of batteries, such as lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries.

[0053] FIG. 5 is a flowchart showing an example of the operation of the detection device. As shown in FIG. 5, when the detection device 1 is powered on, the fan 22 is driven (step 1).

[0054] When the fan 22 starts to operate, the time measurement unit 241 measures the operation time of the fan 22 (step 2). The time measurement unit 241 transmits the operation time to the time determination unit 243.

[0055] The time determination unit 243 compares the operating time with a predetermined threshold value set in the recording unit 242 (step 3).

[0056] If the operation time is equal to or less than the predetermined threshold, the time determination unit 243 determines to continue operation of the fan 22. The drive unit 247 continues driving the fan 22. If the operation time exceeds the threshold, the time determination unit 243 determines to stop operation of the fan 22. The drive unit 247 stops driving the fan 22 and stops fire monitoring (step 4).

[0057] If the operating time of the fan 22 does not exceed a predetermined threshold value, the control unit 24 controls the combustion product introduction section 3, which is a position fixing means, so that the tensioned state cannot be released, for example, the fixation between the cylindrical section 31 and the cylindrical section 32 and the fixation between the cylindrical section 32 and the cylindrical section 33 cannot be released. The method of fixing and releasing the cylindrical portion 31 and the cylindrical portion 32, and the method of fixing and releasing the cylindrical portion 32 and the cylindrical portion 33 are arbitrary, but for example, the fixing portion 27 may be provided with a protrusion that can communicate with the device body 2 on the inside near the tip of the cylindrical portion 31 and can be switched between protruding and not protruding, and fixing holes that can engage with the protrusions are provided at multiple locations on the cylindrical portion 32, so that the protrusions are put in a non-protruding state under the control of the control unit 24 at a timing when the tensioned state can be released, and the protrusions are put in a protruding state under the control of the control unit 24 at a timing when the tensioned state cannot be released, thereby fixing and releasing the cylindrical portion 31 and the cylindrical portion 32. The fixing and releasing method of the cylindrical portion 32 and the cylindrical portion 33 may also be performed in a similar manner.

[0058] Furthermore, in step 3, if the operating time exceeds a predetermined threshold, the warning signal transmitting unit 253, which has received a signal to that effect from the time determining unit 243, may transmit a control signal to emit a sound to a transmitting unit (not shown) provided in the device main body 2. Alternatively, the time determining unit 243 may transmit a signal to notify the effect to a PC, smartphone, tablet terminal, or the like used by an administrator, or the like.

[0059] In addition, when the operating time is below a predetermined threshold and an operation to stop the detection device 1 is input by operating a switch (not shown), the warning signal transmitting unit 253 may receive a signal to that effect from the time determination unit 243 and transmit a control signal to emit a warning sound to the transmitter, or the warning signal transmitting unit 253 may receive a signal to that effect from the time determination unit 243 and transmit a signal to notify a PC, smartphone, tablet terminal, etc. used by an administrator, etc.

[0060] The device body 2 may also have a monitoring unit that monitors clogging by dust or the like in the combustion product introduction section 3. For example, a flow velocity meter may be installed in the combustion product introduction section 3, and clogging is determined to occur if the measured flow velocity is below a threshold value. When the monitoring unit determines that clogging has occurred, the warning signal transmitting unit 253 may receive a signal to that effect and transmit a control signal to the transmitting unit to sound a warning sound.

[0061] In the detection device 1 configured in this manner, the control unit 24 controls the fan 22 and other components of the detection device 1 so that they cannot be stopped unless the operating time measured by the time determination unit 243 exceeds a predetermined threshold. Therefore, the combustion product sensing unit 23 can sense the combustion products s ​​for the predetermined time until the threshold is reached, and continue fire monitoring. Therefore, it is possible to reliably detect fires and fire precursors for the predetermined time without unexpected operation stoppages or movements.

[0062] In addition, the combustion products detector 23 detects the combustion products, and can reliably notify users and construction personnel of fires and their precursors to fires.

[0063] Furthermore, the control unit 24 controls the position fixing means so that the tensioned state of the combustion product introduction unit 3 cannot be released unless the operating time measured by the time measurement unit 241 exceeds the threshold. Therefore, the detection device 1 is fixed for a predetermined time until the threshold is reached, and the combustion product sensing unit 23 senses the combustion products s, allowing fire monitoring to continue.

[0064] In addition, depending on the result of the battery remaining capacity determination in the power supply unit determined by the battery remaining capacity measurement unit 252, it is possible to flexibly respond to fire monitoring, such as by charging the battery in advance or selecting a location for placement.

[0065] Second Embodiment The detection device according to the second embodiment will be described mainly with reference to Fig. 6. In the embodiments described below, configurations corresponding to those in the above-described embodiments will be denoted by the same reference numerals, and descriptions thereof may be omitted.

[0066] FIG. 6 is a schematic diagram showing a detection device according to a second embodiment of the present invention. As shown in FIG. 6, a detection device 1A according to this embodiment includes a device body 2 and a combustion product introduction section 3A.

[0067] The combustion product introduction section 3A is formed in a cylindrical shape and has a fixed hollow section 35 extending in the vertical direction and a connection section 38. The connection section 38 is bent in an L-shape from the lower part of the fixed hollow section 35 toward the detection device 1A side. The fan 22 is installed on the connection section 38 side of the combustion product introduction section 3A from the combustion product sensing section 23, and sucks the combustion products toward the combustion product sensing section 23 side. The connection section 38 may not be L-shaped, and the fixed hollow section 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 section 23 as in the first embodiment, and sucks the combustion products into the combustion product sensing section 23. At the upper part of the combustion product introduction section 3A, one or more openings 34a are formed in the horizontal direction that communicate with the inside and outside of the combustion product introduction section 3A.

[0068] Beneath the ceiling member b, a support member c made of 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 member b.

[0069] A position fixing means 4 is provided at the vertical middle of the combustion product introduction section 3A. The combustion product introduction section 3A is detachably fixed to the support material c by the position fixing means 4. The position fixing means 4 is configured, for example, by a clamp member that can clamp the support material c from the vertical direction with upper and lower separated members. In addition, both upper and lower separated members function as fixing parts 27. One or both of the members functioning as fixing parts 27 are configured as electromagnets whose magnetic force can be switched ON / OFF based on the control of the control unit 24, and when the magnetic force is ON, an attractive force is generated between the two members to fix them, and during that time, the clamping of the support material c by the position fixing means 4 cannot be released. Furthermore, the position fixing means 4 may be configured, for example, by an electric lock capable of clamping the support material c between two members rotatable around a hinge portion. The hinge portion functions as the fixing portion 27. The hinge portion functioning as the fixing portion 27 is configured to be able to switch between non-rotatable and rotatable states of the two members based on the control of the control portion 24, and while the two members are controlled to be non-rotatable, the clamping of the support material c by the position fixing means 4 cannot be released. As described above, when the operation time of the fan 22 does not exceed the predetermined threshold, the control unit 24 controls the fixing unit 27 not to release the position fixing means 4 .

[0070] The combustion product introduction section 3A is disposed above the support material c and below the ceiling member b. In order to efficiently draw the combustion products s ​​into the combustion product introduction section 3A, it is preferable that the opening 34a is disposed immediately below the ceiling member b, but the opening 34a may be disposed below the support material c.

[0071] In the detection device 1A configured in this manner, the control unit 24 controls the fan 22, the combustion product sensing unit 23, the display unit 25, the power supply unit 26, and the fixed unit 27 so that they cannot be stopped or released unless the operating time measured by the time determination unit 243 exceeds a predetermined threshold. Therefore, until the predetermined threshold is reached, the combustion product sensing unit 23 senses the combustion products s, and the fixed unit 27 prevents movement from the installation location, allowing fire monitoring to continue at the specified installation location. Therefore, fires and fire precursors can be reliably detected for a specified time without unexpected operation stoppages or movement.

[0072] 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.

[0073] In the embodiment described above, the control unit 24 includes the battery remaining capacity measuring unit 252, but the present invention is not limited to this. The control unit 24 does not necessarily have to include the battery remaining capacity measuring unit 252.

[0074] The detection device 1 may also include an operation unit. The operation unit prevents the power from being turned off by simply pressing the power button of the device, so that operation is not stopped unexpectedly. By using a simple method such as an operation that cannot be performed unless the user knows how to operate the device, for example, pressing and holding the power button for 2 to 3 seconds and then pressing another button at the same time, or locking the power operation with a password, it is possible to make it difficult to operate erroneously and to make it impossible to stop the detection device.

[0075] The detection device 1 may also include a movement detection unit (not shown) such as various sensors. The movement detection unit can prevent the detection device 1 from being moved from the detection position by detecting the acceleration and tilt angle when the detection device 1 moves. Similarly, the movement detection unit can detect the detection device 1 falling over due to contact with a person or the influence of wind, etc. When the movement detection unit detects the movement or fall of the detection device 1, it can send a signal to the control unit 24, and can notify the user or manager of the detection device 1 of the movement or fall. In order to prevent false detection due to vibration of the detection device caused by work during construction or wind, etc., the movement detection unit can be set with threshold values ​​for acceleration and tilt angle. In addition, by not measuring the acceleration and tilt angle for a certain period of time immediately after the operation of the detection device, it is possible to adjust the installation position of the detection device.

[0076] The time measurement unit 241 may measure a time other than the operating status of the fan 22. An appropriate time such as the elapsed time from power-on or the elapsed time from the button operation to start monitoring may be measured and used as the operating time. [Explanation of symbols]

[0077] 1. Detection device 2. Device body 3. Combustion product introduction section 5. Welding machine 22 Fan 23 Combustion product detector 24 Control Unit 26 Power supply section 34a opening 51 Control section 241 Time Measurement Unit 245 Measuring section 252 Battery level measurement unit b Ceiling section s Combustion products

Claims

1. A combustion product sensing unit capable of sensing combustion products is provided, A detection device capable of fire monitoring based on the operation of the combustion product sensing unit, a time measurement unit for measuring an operation time, which is a time period from when the fire monitoring is started to when the fire monitoring is continued; A detection device comprising: a control unit that controls the fire monitoring so that it cannot be stopped unless the operating time measured by the time measurement unit exceeds a predetermined threshold.

2. A position fixing means is provided for fixing the detection device at an installation position, The detection device according to claim 1 , wherein the control unit performs control such that fixation of the detection device by the position fixing means cannot be released unless the operating time measured by the time measurement unit exceeds the predetermined threshold value.

3. a combustion product introduction section having an opening communicating with the inside and the outside; A fan that draws the combustion products into the combustion product introduction portion, The detection device according to claim 1 , wherein the control unit controls the fan so that the fan cannot be stopped unless the operation time measured by the time measurement unit exceeds the predetermined threshold value.

4. a battery unit for supplying power to the detection device; a power supply unit that supplies electricity from an external power supply to the battery unit; A battery remaining capacity measuring unit, The detection device according to claim 1 or 2, wherein the battery remaining capacity measuring unit, when operating the detection device, determines whether the remaining battery capacity of the power supply unit is greater than the amount of power consumed by the detection device until the operating time reaches the specified threshold.

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