Detector

Abstract

To provide a detector that can monitor even a battery (storage battery) power supply for a long time compared to an always-on type one.SOLUTION: A detector comprises: a combustion product introduction unit having multiple openings communicating between inside and outside; a fan 22 for sucking a combustion product into the combustion product introduction unit; a combustion product sensing unit 23 that can sense the combustion product sucked by the fan 22; a control unit 24 for intermittently or continuously driving the fan 22 according to the sensing result of the combustion product sensing unit 23; and a power supply unit 26.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0003] Also, an alarm device is known that can switch between a normal mode and a power saving mode depending on the detection result of an abnormality detection section (see Patent Document 2 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-325063 [Patent Document 2] JP 2019-40232 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, since there is no permanent power source at each location on the construction site and the installation location of the smoke detection suction device (an example of a detection device in this application) needs to be changed depending on the construction situation, a battery-powered drive system is required when installing. However, if the power source of the portable smoke detection suction device is a battery (storage battery), there is a problem that if the battery runs out, it will not be able to detect fires or fire precursors when needed. In this application, a fire is defined as a state in which combustibles are heated and smoldering or flames are generated, resulting in the generation of combustion products. A fire precursor is a point in time before a fire occurs, when the temperature of combustibles rises or combustion products are generated.

[0006] Also, the alarm in Patent Document 2 does not perform battery exhaustion detection operations in power saving mode, and does not achieve a significant effect in terms of reducing power consumption.Furthermore, the alarm detects smoke with a sensor installed inside the housing of the alarm, and is not configured to actively draw smoke into the alarm, nor does it consume battery power to draw in smoke, and there is no suggestion that this contributes to the control of the suction function of the present invention, which will be described later.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a detection device that is capable of monitoring for a longer period of time compared to a constantly operating type even when the power source is a battery (storage battery). [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. That is, the detection device of the present invention comprises a combustion product introduction section in which an opening communicating with the inside and outside of a hollow member is formed, a fan that draws combustion products into the combustion product introduction section, a combustion product sensing section that can sense the combustion products drawn in by the fan, a control section that intermittently or continuously drives the fan depending on the detection result of the combustion product sensing section, and a power supply section. Combustion products include products such as smoke, carbon monoxide, carbon dioxide, ethylene, formaldehyde, and other gases that are generated when organic matter is burned. Combustion products include those that are generated when the temperature of the organic matter rises before it is burned.

[0009] In the detection device configured in this manner, the control unit drives the fan intermittently or continuously depending on the detection result of the combustion product detection unit. This reduces power consumption, enabling the detection device to operate for a long time, and allowing the occurrence of a fire to be detected for a long time. Therefore, even if the power source is a battery (storage battery), it is possible to monitor for a long time compared to a continuous operation type.

[0010] In the detection device according to the present invention, the control unit may switch the rotation speed of the fan between a low speed and a high speed when the fan is intermittently driven.

[0011] In a detection device configured in this manner, the control unit can switch the fan rotation speed between low and high when the fan is operated intermittently, thereby reducing power consumption and allowing the detection device to operate for long periods of time.

[0012] In addition, in the detection device of the present invention, the combustion product introduction section may be formed by the expandable hollow member, and the control section may be capable of changing the rotational speed at which the fan is intermittently driven depending on the length of the combustion product introduction section.

[0013] In a detection device configured in this manner, the control unit can change the rotation speed at which the fan rotates intermittently in accordance with the length of the combustion product introduction section, so that the fan rotation speed during intermittent operation can be set to the minimum required rotation speed, and even if the length of the combustion product introduction section becomes long, the fan rotates at a high speed in accordance with the length, so that the sucked in combustion products can be detected more quickly by the combustion product detection unit.

[0014] The detection device according to the present invention may further include a length measuring section that measures the length and / or the inner diameter of the combustion product introduction section.

[0015] In the detection device configured in this manner, by having a length measuring unit that measures the length and / or inner diameter of the combustion product inlet section, the fan rotation speed can be automatically controlled based on the length and / or inner diameter of the combustion product inlet section measured by the length measuring unit. In addition, by controlling the rotation speed of the fan during intermittent operation according to the installation conditions of the detection device, the arrival time at the combustion products sensing section can be made the same regardless of the length of the combustion products introduction section, thereby ensuring detection performance and achieving long-term monitoring through intermittent operation. Effect of the Invention

[0016] According to the detection device of the present invention, even if the power source is a battery (storage battery), it is possible to perform monitoring for a longer period of time compared to a continuous-operation type. [Brief description of the drawings]

[0017] [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 information related to the concentration of combustion products of the detection device according to the first embodiment of the present invention and the fan rotation speed. [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] 10 is a block diagram showing an example of the configuration of a control unit of a detection device according to a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] 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 main body 2 and a combustion product introduction section 3.

[0019] 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.

[0020] The housing unit 21 houses 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.

[0021] The fan 22 draws combustion products such as smoke, which will be described later, into the housing 21 through an opening 34 a of the combustion product introduction section 3 .

[0022] 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 as the detection result of the combustion products sensing unit 23. The 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.

[0023] 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.

[0024] 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, a carbon monoxide sensor for carbon monoxide, an ethylene sensor for ethylene, etc. for each component to be detected, 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.

[0025] As a method for measuring the smoke concentration, which is an example of a combustion product, 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 the 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 a smoke concentration.

[0026] The control unit 24 performs overall control of the device main body 2. The control unit 24 is connected to the power supply unit 26, the combustion product detection 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, and judges whether a fire has occurred or whether there is a sign of a fire. When information related to the concentration of the combustion products measured by the combustion product detection 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 there is a sign of a fire and sends a display signal to the display unit 25. Note that a fire is defined as a state in which a combustible material is heated and a combustion product is generated due to a flaming fire that causes smoldering or flames. A fire is defined as a time when the temperature of the combustible material rises or when combustion products are generated.

[0027] 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 when it is determined that there is a fire, and flash yellow when it is determined that there is a precursor to a fire, for example. Moreover, the display unit 25 may emit a warning sound such as a siren instead of blinking an indicator lamp, and the warning sound may be changed depending on the result of the determination of a fire or a sign of a fire. Also, an alarm may be sounded when the power capacity of the device main body 2 falls below a certain value and the battery needs to be replaced or recharged.

[0028] 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).

[0029] The power supply unit 26 supplies power to the fan 22, the combustion product sensing unit 23, and the control unit 24. The power supply unit 26 is a storage battery such as a battery. This makes it possible to operate the detection device 1 even in places without an external power source, thereby expanding the range in which it can be installed.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The cylindrical portion is fixed to an upper surface 21u of the housing portion 21 of the device main body 2 so as to protrude upward, and a lower end portion is connected to a fan 22 inside the housing portion 21.

[0036] 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 can be easily sucked into the combustion product introduction portion 3.

[0037] The cylindrical portion 31 protrudes from the upper surface 21u of the housing portion 21, and is fixed by a pressing force with an upper end portion 33u in contact with the lower surface b1 of the ceiling member b. In other words, the combustion product introduction portion 3 is braced between the upper surface 21u of the housing portion 21 and the lower surface b1 of the ceiling member b.

[0038] When combustion products s ​​are generated by a fire, the combustion products s ​​rise and accumulate near the underside b1 of the ceiling member b. The combustion products s ​​are sucked into the combustion products introduction section 3 through the opening 34a 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 predetermined indication lamp or emits an alarm sound. The worker can know that a fire or a precursor to a fire has occurred by visually checking the color of the indication lamp of the display section 25 or by listening to the alarm sound.

[0039] 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 lower surface b1 of the ceiling member b are sensed by the combustion products sensing unit 23, so that a fire or a precursor to a fire can be detected. 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. Therefore, the control unit 24 controls the fan 22 to be driven intermittently at a predetermined interval under normal circumstances, and to be driven continuously when information related to the concentration of the combustion products s ​​measured by the combustion products sensing unit 23 exceeds a threshold value, thereby suppressing power consumption and enabling the fan 22 to be driven for a long time. In the present invention, intermittent driving refers to driving the fan 22 repeatedly at a high rotation speed (high speed) and at a low rotation speed (low speed).

[0040] 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 drive unit 247, a battery remaining capacity measurement unit 252, and a warning signal transmission unit 253.

[0041] The time measurement unit 241 measures the operation time according to the rotation speed of the fan 22 .

[0042] A threshold value for the high speed operation time and the low speed operation time of the fan 22, and a threshold value for information related to the concentration of combustion products are registered in advance in the recording unit 242. The threshold values ​​can be changed as appropriate.

[0043] When the combustion product concentration determination unit 244 described later determines that intermittent operation is possible, the time determination unit 243 compares the high-speed operation time and low-speed operation time of the fan 22 measured by the time measurement unit 241 with a threshold value for the high-speed operation time and a threshold value for the low-speed operation time of the fan 22 registered in advance in the recording unit 242. When the high-speed operation time of the fan 22 is equal to or less than the registered threshold value, the time determination unit 243 determines to continue the high-speed operation of the fan 22. When the high-speed operation time exceeds the threshold value, the time determination unit 243 determines to change the operation speed of the fan 22.

[0044] Furthermore, the time determination unit 243 compares the low-speed operation time of the fan 22 measured by the time measurement unit 241 with a threshold value for the low-speed operation time of the fan 22 stored in advance in the recording unit 242, and determines to continue the low-speed operation of the fan 22 if the low-speed operation time of the fan 22 is equal to or less than the threshold value. If the low-speed operation time exceeds the threshold value, the time determination unit 243 determines to change the operation speed of the fan 22.

[0045] 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.

[0046] The drive unit 247 controls the driving of the fan 22. When the time determination unit 243 determines that the fan 22 is operating, the drive unit 247 continues driving the fan 22. When the time determination unit 243 determines that the driving of the fan 22 is to be stopped, the drive unit 247 stops the driving of the fan 22. In addition, the operation speed of the fan is changed depending on the operation speed of the fan determined by the time determination unit 243, high speed operation or low speed operation.

[0047] FIG. 3 is a diagram showing the relationship between information related to 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 based on the determination by the time determination unit 243. 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 the 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 based on the determination by the time determination unit 243. 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.

[0048] The battery remaining amount measuring unit 252 measures the remaining battery amount of the power supply unit 26. For example, the battery amount that allows the fan 22 to operate for about two hours is set as a threshold, and if the battery amount is less than this, the warning signal transmitting unit 253 transmits a warning signal to the display unit 25. When the display unit 25 receives the warning signal, it displays an identifiable display such as a warning lamp. Furthermore, when the display unit 25 receives the warning signal, it may sound a warning that the remaining battery amount is low. The threshold value of the remaining battery amount of the power supply unit 26 for issuing a warning signal can be set as appropriate.

[0049] The threshold value of the remaining battery power when issuing a warning may be corrected according to the temperature of the space in which the device body 2 is installed. When the temperature of the place where the device body 2 is installed is low, the battery will wear out quickly, so the threshold value may be set high.

[0050] In addition, a temperature sensor may be installed on the outer peripheral surface of the device main body 2, and the time measurement unit 241 may be used to predict the time until a set remaining battery charge limit is reached, using the outside air temperature measured by the temperature sensor at predetermined intervals and the degree of battery consumption of the power supply unit 26.

[0051] An example of a method for checking the battery capacity for a predetermined operating time will be described. FIG. 4 is a diagram showing the relationship between the discharge capacity and the 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 depending on the 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. At the time of design, measure the relationship between the battery voltage and the discharge capacity at each temperature (in 5°C steps) and register it in advance in the recording unit 242 of the apparatus main body 2. Define the total amount X of the current for operating the apparatus main body 2 for a predetermined time at the time of design. Obtain the current temperature and the current battery voltage, and measure the total amount Y of the current discharged from full charge to the present from the "relationship between the battery voltage and the discharge capacity" registered in the recording unit 242. Based on the current temperature, obtain the discharge capacity Z at full charge. Determine whether the discharge for a predetermined time is possible depending on whether X + Y + α (margin) < Z is satisfied. When using other types of batteries such as lead-acid batteries, nickel-metal hydride batteries, and nickel-cadmium batteries, it is also desirable to confirm in the same manner.

[0052] FIG. 5 is a flowchart showing an operation example of the detection device. As shown in FIG. 5, when the detection device 1 is powered on and starts operating (step 1), the fan 22 is driven intermittently (step 2).

[0053] The control unit 24 determines whether the detection result measured by the combustion product detection unit 23 is greater than a threshold value (step 3). If it is greater than the threshold value, the fan 22 is driven continuously (step 4). If it is below the threshold value, the intermittent driving is continued.

[0054] 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 on the inner peripheral surface of the combustion product introduction section 3, and if the flow velocity measured while the fan 22 is continuously operating is less than a threshold value, it is determined that clogging has occurred. When the monitoring unit determines that clogging has occurred, the warning signal transmitting unit 253 that receives a signal to that effect may transmit a control signal to the transmitting unit to sound a warning sound.

[0055] In the detection device 1 configured in this manner, the control unit 24 drives the fan intermittently or continuously in response to information related to the combustion product concentration measured by the combustion product sensing unit 23. This reduces power consumption, enables the fan to be driven for a long time, and the detection device 1 can also operate for a long time, making it possible to detect the occurrence of a fire for a long period of time. Therefore, even if the power source is a battery (storage battery), monitoring can be performed for a longer period of time than with a constantly operating type.

[0056] In addition, when the fan 22 is driven intermittently, the control unit 24 can switch the rotation speed of the fan 22 between low and high speed as necessary, thereby reducing power consumption and allowing the detection device 1 to operate for a long period of time.

[0057] Second Embodiment The detection device according to the second embodiment will be described mainly with reference to Fig. 6. In the embodiment described below, configurations corresponding to those in the above-described embodiment will be denoted by the same reference numerals, and description thereof may be omitted.

[0058] In the first embodiment described above, the drive mode of the fan 22, i.e., whether to drive intermittently or continuously, was determined based on information related to the concentration of the combustion products sensed by the combustion product sensing unit 23. In the present embodiment, however, the control unit 24 further controls the drive mode of the fan 22 depending on the length and / or inner diameter of the combustion product introduction section 3.

[0059] The control unit 24 includes, in addition to the above-mentioned time measurement unit 241, a length measurement unit 245, and a length determination unit 246. In the length measurement unit 245, relationship information between the length and / or inner diameter of the combustion product introduction unit 3 and the rotation speed of the fan 22 to be set is registered in advance.

[0060] The length measuring unit 245 measures the length L (see FIG. 1) of the expandable combustion product introduction part 3. For example, a measuring instrument such as a linear encoder or a laser distance meter is provided in the combustion product introduction part 3, and the measuring unit 245 receives length information transmitted from the measuring instrument. The inner diameter of the combustion product introduction part 3 may be registered in advance in the length determining unit 246. Furthermore, regarding the length and inner diameter of the combustion product introduction section 3, the inner diameter is known at the manufacturing stage of the detection device 1, and the length is known at the installation stage of the detection device 1. Therefore, by inputting the numerical values ​​of the length and inner diameter of the combustion product introduction section 3 into the length measurement unit 245, it is also possible to set the rotation speed of the fan 22 based on the length and / or inner diameter registered in advance in the recording unit 242.

[0061] 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 registered in advance in the recording section 242. It is registered in the recording section 242 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 or the inner diameter becomes larger.

[0062] In the detection device 1 configured in this manner, the control unit 24 drives the fan intermittently or continuously in response to information related to the combustion product concentration measured by the combustion product sensing unit 23, and operates the fan at an appropriate fan speed in response to the configuration of the combustion product introduction unit 3. This makes it possible to reduce power consumption and enable the detection device 1 to operate for a long period of time, making it possible to detect the occurrence of a fire for a long period of time. Therefore, even if the power source is a battery (storage battery), monitoring can be performed for a longer period of time than with a continuous operation type.

[0063] In addition, the control unit 24 can change the rotation speed of the fan 22 when it is driven intermittently in accordance with the length or inner diameter of the combustion product introduction section 3, so that the fan rotation speed during intermittent operation can be set to the minimum required rotation speed, and even if the length L of the combustion product introduction section 3 is long, the fan rotates at high speed in accordance with the length, and even if the inner diameter of the combustion product introduction section 3 is large, the fan rotates at high speed in accordance with the size, so that the sucked in combustion products can be more reliably detected by the combustion product detection unit 23.

[0064] In addition, by having a length measuring unit 245 that measures the length L and / or inner diameter of the combustion product introduction section 3, the rotation speed of the fan 22 can be automatically controlled based on the length L and / or inner diameter of the combustion product introduction section 3 measured by the length measuring unit 245.

[0065] In addition, by controlling the rotation speed of the fan 22 during intermittent operation according to the installation conditions of the detection device 1, the time until detection can be made approximately the same regardless of the length of the combustion product introduction section 3, thereby ensuring detection performance and achieving long-term monitoring through intermittent operation.

[0066] 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.

[0067] For example, in the embodiment described above, when the fan 22 is rotated at high speed during intermittent driving of the fan 22, the driving unit 247 controls the rotation speed of the fan 22 to be faster as the length of the combustion product introduction section 3 is longer or the inner diameter of the combustion product introduction section 3 is larger, but the present invention is not limited to this. The rotation speed of the fan 22 may be constant and not changed depending on the length or inner diameter of the combustion product introduction section 3.

[0068] 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. If there is an external power source such as a distribution board around the detection device 1, the use of the external power source eliminates the need to measure the battery remaining capacity, and therefore the battery remaining capacity measuring unit 252 may not be used. [Explanation of symbols]

[0069] 1. Detection device 2. Device body 3. Combustion product introduction section 22 Fan 23 Combustion product detector 24 Control Unit 26 Power supply section 34a opening 241 Time Measurement Unit 245 Measuring section 252 Battery level measurement unit b Ceiling material s Combustion products

Claims

1. a combustion product introduction section having an opening communicating with the inside and outside of the hollow member; A fan that draws combustion products into the combustion product introduction portion; a combustion product sensor capable of sensing the combustion products sucked in by the fan; a control unit that drives the fan intermittently or continuously in response to a detection result of the combustion product detection unit; A detection device comprising:

2. The detection device according to claim 1 , wherein the control unit switches the rotation speed of the fan between a low speed and a high speed when the fan is intermittently driven.

3. The combustion product introduction section is formed by the expandable hollow member, 3. The detection device according to claim 1, wherein the control unit is capable of changing a rotation speed of the fan when the fan is intermittently driven in accordance with a length of the combustion product introduction portion.

4. The detection device according to claim 3, further comprising a length measuring section for measuring the length and / or the inner diameter of the combustion product introduction section.

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