CN114613093A - Gas sensor array device based on crosslinked polyethylene combustion products and detection method - Google Patents
Gas sensor array device based on crosslinked polyethylene combustion products and detection method Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 20
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
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- 230000002159 abnormal effect Effects 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 8
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- 238000009434 installation Methods 0.000 description 9
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- 238000013021 overheating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
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- 238000004868 gas analysis Methods 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
Abstract
A gas sensor array device based on crosslinked polyethylene combustion products and a detection method relate to the field of fire detection and are used for solving the problems that fire detection is not timely and accurate before a cable fire happens. The array device comprises a sensor unit, a power supply module and a transmission module, wherein the power supply module provides electric energy required by normal work for the sensor unit, the sensor unit is in signal connection with the transmission module, and the sensor unit detects whether the temperature of a cable is abnormal or not, whether CO is generated or not, whether smoke is generated or not and whether HCl gas is generated or not, and transmits an abnormal signal detected by the sensor unit to a fire early warning main control room through the transmission module. The invention has the advantages of low investment, stable and rapid cable fire detection and capability of timely finding out the fire at the first time.
Description
Technical Field
The invention relates to the technical field of fire detection, in particular to a gas sensor array device based on a crosslinked polyethylene combustion product and a detection method.
Background
The cable fire accident has the characteristics of strong burst property, rapid diffusion, high rescue difficulty, wide damage range and the like. The cable mainly comprises a conductor, insulation and a sheath, and the combustion characteristics of the insulation and sheath materials have direct influence on the fire characteristics, so that the overall combustion performance of the cable is directly influenced by the combustion performance of the cable sheath and the insulation materials. In the prevention work of channel cable fire, how to realize early warning before cable burning has important significance.
Disclosure of Invention
The invention aims to provide a gas sensor array device based on a crosslinked polyethylene combustion product and a detection method, which are used for solving the problems of untimely and inaccurate fire detection before a cable fire happens, and further avoiding the problems of missed alarm and false alarm of fire monitoring.
The technical scheme adopted by the invention for solving the technical problems is as follows: the gas sensor array device based on the crosslinked polyethylene combustion products comprises a sensor unit, a power supply module and a transmission module, wherein the power supply module provides electric energy required by normal work for the sensor unit, the sensor unit is in signal connection with the transmission module, and abnormal signals detected by the sensor unit are transmitted to a fire early warning main control room through the transmission module;
the sensor unit comprises a mounting assembly, a CO sensor, a temperature sensor, a smoke sensor, an Hcl sensor and a fixing assembly, wherein the CO sensor, the temperature sensor, the smoke sensor and the Hcl sensor are fixed on the mounting assembly, the mounting assembly is fixed on a cable, the first end of the fixing assembly is hinged to the mounting assembly, and the second end of the fixing assembly is fixedly connected with the inner wall of a cable channel or a cable bridge.
Furthermore, the transmission module comprises a ZigBee network, a ZigBee gateway, an on-site module and a bus, the ZigBee network uploads signals collected by each sensor to the ZigBee gateway, the ZigBee gateway uploads the signals to the on-site module, the on-site module is in signal connection with the bus, and the bus is in signal connection with a cable fire prevention early warning monitoring system and a monitoring system workstation of a fire early warning main control room.
Furthermore, the mounting assembly comprises a first clamp and a second clamp, the first clamp and the second clamp are both of circular arc structures, the first end of the first clamp is hinged with the first end of the second clamp, and a locking bolt is arranged between the second end of the second clamp and the second end of the second clamp; and a cavity for clamping the cable is enclosed between the first clamp and the second clamp.
Furthermore, a guide rail is fixed on the outer wall of the first clamp, a first support is slidably mounted on the guide rail, and a bolt is arranged between the first support and the guide rail; the relative movement direction between first support and the first clamp is parallel with first clamp axis.
Further, fixed subassembly includes mobile jib, auxiliary rod and mounting panel, wherein the first end and the first support universal connection of mobile jib, the first end and the mounting panel universal connection of auxiliary rod, the second end and the auxiliary rod second end threaded connection of mobile jib.
Furthermore, a gasket is arranged on the inner wall of the first clamp and the inner wall of the second clamp.
Furthermore, two groups of elastic pieces are fixed on the inner walls of the first hoop and the second hoop, the first ends of the elastic pieces are fixedly connected with the inner walls of the first hoop and the second hoop, and the second ends of the elastic pieces extend to the axial positions of the first hoop and the second hoop and are suspended in the air; the second end of the elastic piece is in contact with the outer wall of the cable to prevent the cable from moving relative to the elastic piece in one direction, and the elastic pieces are arranged in two groups to prevent the cable from moving relative to the first hoop and the second hoop in the left and right directions.
Furthermore, the end part of the elastic sheet is provided with anti-slip teeth.
Further, an extension rod is detachably mounted between the main rod and the auxiliary rod.
The invention also provides a detection method based on the crosslinked polyethylene combustion product, which comprises the following steps:
(1) when a cable in a cable channel has a fire, each sensor in the sensor unit acquires an abnormal signal and gives an alarm;
(2) each sensor processes the acquired signal and transmits the processed signal to the local module of the sensor unit;
(3) the local module of the sensor unit converts the signals and transmits the converted signals to the fire early warning main control room through the optical fiber;
(4) and the fire early warning main control room carries out corresponding treatment according to the fire condition, and if the fire early warning main control room sends a signal to the fire extinguishing device, the fire extinguishing device is started to extinguish the fire.
The invention has the beneficial effects that: according to the gas sensor array device and the detection method based on the crosslinked polyethylene combustion product, the adopted ZigBee network can realize wireless communication with low cost, low power consumption, low complexity and low speed, is suitable for the application scene of winding and winding of a cable channel, can ensure stable transmission of information, and can reduce signal interference; the information converted by the local module is accessed into the fire early warning main control room in an optical fiber mode, the method is mature and stable, the transmission speed is high, the fire alarm can be found and processed at the first time, and the in-station cable fire prevention monitoring and warning functions are achieved.
The invention adopts a local power supply mode, supplies power to the system by using power from a nearby camera, is very suitable for mountain areas, generally adopts monitoring measures of building a lookout tower and building a video monitoring station and the like for forest fires in the mountain areas, and also uses monitoring equipment to monitor mountain garbage in part of mountain scenic spot areas, thereby providing convenient and fast conditions for power supply of the system, being convenient to install and reducing investment.
According to the invention, through the gas sensor array device arranged on the outer side of the cable, once the cable is abnormal, the CO sensor, the Hcl sensor, the smoke sensor and the temperature sensor on the array device can acquire corresponding signals of the cable, and through the omnibearing signal acquisition, the abnormity of the cable can be found at the first time, so that the abnormal signals of the cable can be uploaded and reported in time, and the processing can be conveniently carried out in time.
Drawings
FIG. 1 is a schematic diagram of an array device of the present invention;
FIG. 2 is a front view of the sensor unit;
FIG. 3 is a side assembly schematic view of the first and second clips;
FIG. 4 is a schematic view of the axial assembly of the first and second clamp bands;
FIG. 5 is a right side view of the first clip;
FIG. 6 is a schematic structural view of the first support;
FIG. 7 is a front view of the fixing assembly;
FIG. 8 is a schematic view of a sensor unit according to the present invention in use;
FIG. 9 is a schematic view of an alternative construction of the first and second clips of the present invention;
FIG. 10 is a schematic view of the assembly of the first and second clips of FIG. 9 with a cable;
FIG. 11 is a schematic diagram of a transmission module;
in the figure: 1 first clamp, 11 articulated shafts, 12 locking bolts, 13 guide rails, 14 first supports, 141 support lugs, 142 threaded holes, 15 grooves, 16 sliding grooves, 17 positioning holes, 2 second clamps, 3 gaskets, 4CO sensors, 41 temperature sensors, 42 smoke sensors, 43Hcl sensors, 5 main rods, 51 first lug plates, 52 second lug plates, 53 auxiliary rods, 54 third lug plates, 55 fourth lug plates, 56 screw rods, 6 mounting plates, 61 second supports, 7 cables, 8 channel inner walls and 9 elastic sheets.
Detailed Description
As shown in fig. 1 to 11, the array device of the present invention mainly includes a sensor unit, a power supply module, and a transmission module, wherein the sensor unit includes a first housing 1, a second housing 2, a CO sensor 4, a temperature sensor 41, a smoke sensor 42, an Hcl sensor 43, and a fixing component, and the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a sensor unit is installed near a cable to be detected, and the sensor unit is used for detecting whether the cable is abnormal, such as whether the temperature is abnormal, whether smoke is generated, and whether specific gas is generated due to combustion. The sensor unit is electrically connected with the power supply module and supplies power to the sensor unit through the power supply module. The power supply module adopts a local power taking mode, takes power from a camera distribution box close to a cable channel, and supplies power to the sensor unit arranged near the cable through a power transmission line. The sensor unit is in signal connection with the transmission module, the transmission module is in signal connection with a host of the fire early warning main control room, and fire signals detected by the sensor unit are uploaded to the fire early warning main control room through the transmission module. As shown in fig. 11, the transmission module includes a ZigBee network, a ZigBee gateway, an on-site module, and a bus, the CO sensor 4, the temperature sensor 41, the smoke sensor 42, and the Hcl sensor 43 are in signal connection with the ZigBee gateway through the ZigBee network, the ZigBee gateway is in signal connection with the on-site module, the on-site module is in signal connection with the bus, and the bus is in signal connection with the cable fire-prevention early-warning monitoring system and the monitoring system workstation in the fire early-warning main control room. Thus, the transmission module realizes the transmission of signals in two modes of wireless transmission and wired transmission. The fire early warning main control room is connected with the fire extinguishing device through signals, and the fire early warning main control room sends signals to the fire extinguishing device, so that the fire extinguishing device acts, and then fire extinguishing operation is executed. The fire extinguishing apparatus is prior art and will not be described in detail herein.
In the whole array device, whether the cable is abnormal or not is detected through the sensor unit positioned in the cable channel, detection signals are transmitted through the ZigBee network when the abnormality is found, and detection data are converted through the on-site module and transmitted to the cable fire prevention early warning monitoring system of the fire early warning main control room through the optical fiber.
As shown in fig. 2 to 10, the sensor unit includes a first clamp 1, a second clamp 2, a CO sensor 4, a temperature sensor 41, a smoke sensor 42, an Hcl sensor 43, and a fixing component, and as shown in fig. 1 to 3, the first and second clamps are both arc-shaped metal members, and the central angles of the first and second clamps are the same. The first end of first clamp 1 and the first end of second clamp 2 pass through articulated axle 11 articulated connection together, and first, second clamp all can rotate around the articulated axle like this. First clamp 1 and second clamp 2 have constituted the installation component of installation sensor, and various sensors are installed on the installation component, and the installation component is used for fixing on waiting to detect the cable.
A locking bolt 12 is arranged between the second end of the first clamp 1 and the second end of the second clamp 2, and the locking and fixing between the first clamp 1 and the second end of the second clamp 2 are realized through the locking bolt 12; the locking bolt 12 penetrates through the second ends of the first hoop and the second hoop, and the first hoop and the second hoop enclose a circular cavity at the moment; the cable to be detected is located in the cavity. As shown in FIG. 3, the width of the first clamp 1 is smaller than that of the second clamp 2, grooves 15 are formed in the first end and the second end of the first clamp 1, the first end of the second clamp 2 extends into the groove 15 in one end of the first clamp 1, and the second end of the second clamp 2 extends into the groove 15 in the second end of the first clamp 1. As shown in fig. 5, a guide rail 13 is fixed on an outer wall of the first yoke 1, a pair of linear slide grooves 16 are provided on the guide rail 13, and a plurality of positioning holes 17 are provided between the pair of slide grooves 16 in close arrangement. A first support 14 is slidably mounted on the guide rail 13, as shown in fig. 6, the first support 14 is a rectangular plate, and a slider slidably connected to the sliding groove is disposed on the first support 14, so as to slidably connect the first support 14 to the guide rail 13. The first support 14 is provided with a threaded hole 142, a bolt is inserted into the threaded hole, and the first support 14 can be fixedly connected with the guide rail 13 after the bolt is screwed with the guide rail, and at the moment, the bolt extends into the positioning hole 17 on the guide rail. A lug 141 is fixed to the first holder 14.
As shown in fig. 2, a smoke sensor 42 and an Hcl sensor 43 are fixedly mounted on at least one of the end surfaces of the first housing 1, and a CO sensor 4 and a temperature sensor 41 are fixedly mounted on at least one of the end surfaces of the second housing, so that after a cable to be measured is placed between the first and second housings and the second ends of the first and second housings are fixedly connected together, a CO sensor 4, a temperature sensor 41, a smoke sensor 42, and an Hcl sensor 43 are provided around the cable; whether CO is generated during cable combustion is detected through a CO sensor 4, and the CO sensor 4 is an ME3-CO sensor; detecting whether the temperature of the cable is too high through a temperature sensor, wherein an HDC2080 temperature sensor is selected as the temperature sensor 41; the smoke sensor 42 is used for detecting whether smoke is generated when the cable is burnt, and the smoke sensor 42 is an MP-2 plane smoke gas sensor; the Hcl sensor 43 is used for detecting whether Hcl gas is generated during cable combustion, and the Hcl sensor 43 is an ME3-HCl sensor. A CO sensor and a temperature sensor or a CO sensor and a smoke sensor can be arranged on the first clamp, and only two types of sensors are arranged on the first clamp or the second clamp, namely, the four types of sensors are uniformly distributed on the first clamp and the second clamp.
The sensor models are as follows:
be fixed with gasket 3 at the inner wall of first, second clamp, gasket 3 is high temperature resistant insulating material, and has the fire prevention function. The spacer 3 is provided to increase the friction between the first and second clamps and the cable to increase the relative stability between the cable and the first and second clamps. According to the cable size, place the gasket of different thickness or increase and decrease the quantity of gasket in first, second clamp to increase the clamping-force of first, second clamp to the cable.
As shown in fig. 2 and 7, the fixing assembly is hinged to the ear plate of the first support 14, the fixing assembly includes a main rod 5, an auxiliary rod 53 fixedly connected to the main rod 5, and a mounting plate 6 hinged to the auxiliary rod 53, a first ear plate 51 is fixed to a first end of the main rod 5, the first ear plate 51 is hinged to a second ear plate 52, and the second ear plate 52 is hinged to the support ear 141. Thus, the first ear plate can rotate relative to the second ear plate, and the second ear plate can rotate relative to the support lug. The rotation plane of the second lug plate rotating relative to the support lug is mutually vertical to the rotation plane of the first lug plate relative to the second lug plate. Thus, the main rod 5 and the lug 141 can rotate in a universal manner. In the same way, a third lug 54 is fixed to the first end of the secondary lever 53, a fourth lug 55 is hinged to the third lug 54, the fourth lug 55 is hinged to a second abutment 61, the second abutment 61 being part of the mounting plate 6. The rotation plane of the third lug plate relative to the fourth lug plate is vertical to the rotation plane of the fourth lug plate relative to the second support. Thus, the mounting plate 6 can be rotated in a universal direction with respect to the sub-lever 53. As shown in fig. 7, a screw 56 is fixed at the second end of the auxiliary rod 53, a blind hole is formed at the second end of the main rod 5, and the screw 56 is in threaded connection with the second end of the main rod, so that the main rod and the auxiliary rod are relatively fixed. When the cable clamp is used, as shown in fig. 8, the second ends of the first clamp and the second clamp are separated, the first clamp and the second clamp are placed on two sides of the cable 7, and then the second ends of the first clamp and the second clamp are fixedly connected together through the locking bolt 12; at this moment, first, second clamp and gasket mating reaction are fixed the cable centre gripping, have realized first, the installation of second clamp on the cable promptly. In this case four sensors are arranged around the cable 7, so that parameters around the cable, including CO, temperature, smoke and Hcl, can be monitored by the four sensors. When the parameters are detected, the corresponding sensors are transmitted to the ZigBee gateway through the ZigBee network, and then the acquired parameters are converted by the on-site module and transmitted to the fire early warning main control room. The fixed subassembly and the swing joint mode of first clamp 1 are convenient for adjust fixed subassembly's position to the mounting panel is installed with cable channel inner wall suitable position.
After the first clamp and the second clamp are installed together with a cable, the main rod and the auxiliary rod are swung, so that the mounting plate is in contact with the inner wall 8 of the cable channel at a proper position, and the mounting plate 6 is fixedly connected with the inner wall 8 of the cable channel through a bolt. When the lengths of the main rod 5 and the auxiliary rod 53 are insufficient, the auxiliary rod 53 can be detached from the main rod 5, and then an extension rod is placed between the main rod 5 and the auxiliary rod 53 to increase the overall length. The extension rod is in threaded connection with the main rod and the auxiliary rod. The mounting plate can also be fixedly connected with the cable bridge.
As shown in fig. 9 and 10, in order to realize the relative fixation of the first and second clamps and the cable, an elastic sheet 9 may be further fixed on the inner walls of the first and second clamps, a first end of the elastic sheet 9 is fixed in contact with the inner walls of the first and second clamps, a second end of the elastic sheet 9 extends and hangs in the air to the axial positions of the first and second clamps, when the cable is placed between the first and second clamps, a second end of the elastic sheet 9 contacts with the outer wall of the cable, and an acute included angle is formed between the elastic sheet and the axial positions of the first and second clamps. Two groups of elastic pieces 9 are arranged on the first clamp and the second clamp respectively, one group of elastic pieces faces to the left, and the other group of elastic pieces faces to the right, so that the two groups of elastic pieces form an obtuse included angle. The end of the second end of the elastic sheet 9 is in contact with the cable, and the end of the second end of the elastic sheet is provided with anti-slip teeth. After the end part of the second end of the elastic sheet is contacted with the outer wall of the cable, when the first hoop and the second hoop are moved to one side where the second end of the elastic sheet is located, the end part of the second end of the elastic sheet is in contact friction with the outer wall of the cable and deforms slightly, and then relative movement between the first hoop and the cable and the second hoop is prevented. When the first hoop and the second hoop move leftwards relative to the cable, the elastic sheets at the left ends of the first hoop and the second hoop act to prevent the first hoop and the second hoop from moving leftwards relative to the cable; when the first hoop and the second hoop move rightwards relative to the cable, the elastic sheets at the right ends of the first hoop and the second hoop act to prevent the first hoop and the second hoop from moving rightwards relative to the cable; and then realize the relative fixed between first, second clamp and the cable. The elastic sheet comprises an inner part and an outer part, wherein the inner layer is a metal sheet, and the outer layer is rubber.
Printed Circuit Boards (PCBs) are provided on the first and second clips for mounting the sensors.
The crosslinked polyethylene combustion product refers to gas generated by pyrolysis of a cable insulating material before a fire disaster is formed, and by researching the pyrolysis characteristic and the combustion characteristic of a typical cable insulating material and analyzing the influence factors of the pyrolysis characteristic and the ignition characteristic of the cable insulating material, the change rule of the fire characteristic parameters of the cable under different influence factors can be obtained, and the mechanism of the cable insulating material for decomposing the gas by overheating is disclosed. The cable insulation material pyrolysis gas production rule under the influence of different complex working conditions and meteorological environments is analyzed by combining with meteorological factors, characteristic parameters capable of effectively representing overheating faults can be obtained, and a cable fire early warning strategy which is adaptive to meteorological changes and based on characteristic gas analysis can be provided by combining with local seasonal meteorological rules.
The sensor unit is preferentially installed at a position with high risk of a cable channel, factors such as the cable, the surrounding environment and historical records are comprehensively considered, and a reasonable installation position is selected. For example, the sensor unit is installed in places where cable faults and fires are likely to occur, such as cable joints and channel corners; there is a potential risk of affecting safe operation of the cable around the cable channel, for example, there are factories storing flammable and explosive materials, construction sites in progress, areas vulnerable to geological disasters, and the like around the cable channel. The method is combined with the accident analysis of cable fire in recent years in China, potential safety hazard positions with high accident rate of cable channels are analyzed and summarized, and guidance is provided for selection of installation positions of the sensor units.
The sensor unit researched by the invention is prone to be installed on site, the sensor unit is installed in the cable channel, the device cabinet is installed at a proper position on the premise that the space of the cable channel is occupied as little as possible, and the device cabinet can be independently built outside the cable channel at the position where the sensor unit cannot be installed in the channel due to dense cables in the cable channel or narrow cable channel.
The measured signals need to be preprocessed before gas species identification is performed. The pretreatment can reduce noise and improve the signal-to-noise ratio; distortion is reduced, and the effective section of the signal is enhanced. A DBNS model is established by utilizing a deep learning technology, when a sample is input into the model, data is firstly given to a display layer, the probability that neurons of the display layer are activated is calculated by the model, a numerical value is taken as a threshold value, the neurons larger than the threshold value are activated, otherwise, the neurons are not activated, and whether each neuron of a hidden layer is activated or not is obtained. And training the DBN by taking a sample library established by data obtained by a simulation experiment as input, wherein the training of the DBN comprises pre-training and fine-tuning and the construction of a qualitative model for the mixed gas. A DBN is formed by a plurality of RBMs, an initial model for qualitative analysis is formed by adding a classification layer on the top, and a Softmax classifier is usually selected as the classification layer and is suitable for the nonlinear multi-classification problem. For the characteristic gas, the response value of the sensor is also selected as input data, and the mixed gas component information is used as expected data. And testing the influence of different layers of RBMs and different numbers of RBMs in each layer on the classification result to obtain the DBN classification model with the optimal classification result.
Different power supply modules are adopted in different environments, and the storage battery is simple in structure, easy to realize and required to be replaced and maintained regularly. The on-line fire monitoring and early warning device of the cable channel generally works in the field, and if the whole device is positioned in the cable channel, the replacement and maintenance cost of the storage battery is greatly increased. The photovoltaic solar power supply mode is widely applied due to the fact that the photovoltaic solar power supply mode is not limited by regions, convenient to use and reproducible. However, the solar energy is used for power supply, and the power supply can not be continuously supplied under the condition of no illumination, so that the requirement of continuous work of online monitoring can not be met. Wind power generation is also greatly influenced by environmental conditions, the power supply stability is low, and the working environment and meteorological conditions of a power supply are poor, so that the on-line monitoring system is difficult to work normally and continuously. The local power taking is realized by accessing a nearby low-voltage power supply to ensure the normal operation of the device, and is a good choice at the position close to the low-voltage power supply in the city in case of fire, thereby having the advantage of good continuous power supply stability. The method for taking electricity from the cable channel close to the camera power distribution cabinet is provided for the cable channel in the mountain forest, so that the device can be conveniently installed, and the investment can be reduced.
When the cable runs abnormally and a fire alarm is about to occur, the fire early warning device can quickly and accurately early warn a fire section in the cable trench. The sensor array can send signals to a fire early warning main control room, and subsequent workers can judge through early warning information to perform the next operation.
According to the array device, the ME3-CO sensor, the ME3-HCl sensor, the HDC2080 temperature sensor, the MP-2 plane smoke gas sensor and other sensors are adopted, the running states of the cable and the connector of the cable can be detected from multiple angles, early warning can be given to the abnormal state of the cable in the cable smoldering or pyrolysis process, the phenomenon that open fire burns due to late reaction time is avoided, early warning is given in the early abnormal high-temperature stage of cable fire, and loss caused by cable fire is reduced; first, the installation that second clamp can be convenient according to the design of cable diameter on the cable can reduce the space and occupy when improving and detect the precision, the installation of the system of being convenient for.
The ZigBee network adopted by the invention can realize wireless communication with low cost, low power consumption, low complexity and low speed, is suitable for the application scene of winding and winding cable channels, can ensure stable transmission of information, and can reduce signal interference; the information converted by the on-site module is accessed into the fire early warning main control room in an optical fiber mode, the method is mature and stable, the transmission speed is high, the fire alarm can be found and processed at the first time, and the in-station cable fire prevention monitoring and warning functions are achieved.
The invention adopts a local power supply mode, supplies power to the system by using power from a nearby camera, is very suitable for mountain areas, generally adopts monitoring measures of building a lookout tower and building a video monitoring station and the like for forest fires in the mountain areas, and also uses monitoring equipment to monitor mountain garbage in part of mountain scenic spot areas, thereby providing convenient and fast conditions for power supply of the system, being convenient to install and reducing investment.
According to the invention, through the gas sensor array device arranged on the outer side of the cable, once the cable is abnormal, the CO sensor, the Hcl sensor, the smoke sensor and the temperature sensor on the array device can acquire corresponding signals of the cable, and through the omnibearing signal acquisition, the abnormity of the cable can be found at the first time, so that the abnormal signals of the cable can be uploaded and reported in time, and the processing can be conveniently carried out in time.
The invention relates to a fire detection method based on a crosslinked polyethylene combustion product, which comprises the following steps:
(1) when a cable in a cable channel has a fire, each sensor in the sensor unit acquires an abnormal signal and gives an alarm;
(2) each sensor processes the acquired signal and transmits the processed signal to the local module of the sensor unit;
(3) the local module of the sensor unit converts the signals and transmits the converted signals to the fire early warning main control room through the optical fiber;
(4) and the fire early warning main control room carries out corresponding treatment according to the fire condition, and if the fire early warning main control room sends a signal to the fire extinguishing device, the fire extinguishing device is started to extinguish the fire.
Claims (10)
1. The gas sensor array device based on the crosslinked polyethylene combustion products is characterized by comprising a sensor unit, a power supply module and a transmission module, wherein the power supply module provides electric energy required by normal work for the sensor unit;
the sensor unit comprises a mounting assembly, a CO sensor, a temperature sensor, a smoke sensor, an Hcl sensor and a fixing assembly, wherein the CO sensor, the temperature sensor, the smoke sensor and the Hcl sensor are fixed on the mounting assembly, the mounting assembly is fixed on a cable, the first end of the fixing assembly is hinged to the mounting assembly, and the second end of the fixing assembly is fixedly connected with the inner wall of a cable channel or a cable bridge.
2. The gas sensor array device based on the crosslinked polyethylene combustion product of claim 1, wherein the transmission module comprises a ZigBee network, a ZigBee gateway, an on-site module and a bus, the ZigBee network uploads signals collected by each sensor to the ZigBee gateway and the ZigBee gateway uploads the signals to the on-site module, the on-site module is in signal connection with the bus, and the bus is in signal connection with a cable fire prevention early warning monitoring system and a monitoring system workstation of a fire early warning main control room.
3. The crosslinked polyethylene combustion product-based gas sensor array device of claim 1, wherein the mounting assembly comprises a first clamp and a second clamp, the first clamp and the second clamp are both in a circular arc structure, a first end of the first clamp is hinged to a first end of the second clamp, and a locking bolt is disposed between a second end of the second clamp and a second end of the second clamp; and a cavity for clamping the cable is enclosed between the first clamp and the second clamp.
4. The gas sensor array device based on crosslinked polyethylene combustion products as claimed in claim 3, wherein a guide rail is fixed on the outer wall of the first clamp, a first support is slidably mounted on the guide rail, and a bolt is arranged between the first support and the guide rail; the relative movement direction between first support and the first clamp is parallel with first clamp axis.
5. The crosslinked polyethylene combustion product-based gas sensor array device of claim 1, wherein the fixing assembly comprises a primary rod, a secondary rod, and a mounting plate, wherein a first end of the primary rod is connected with the first support in a universal manner, a first end of the secondary rod is connected with the mounting plate in a universal manner, and a second end of the primary rod is connected with a second end of the secondary rod in a threaded manner.
6. The crosslinked polyethylene combustion product-based gas sensor array device of claim 3, wherein spacers are provided on the inner walls of the first and second collars.
7. The crosslinked polyethylene combustion product-based gas sensor array device as claimed in claim 3, wherein two sets of elastic pieces are fixed on the inner walls of the first and second clamp, the first ends of the elastic pieces are fixedly connected with the inner walls of the first and second clamp, and the second ends of the elastic pieces extend towards the axial positions of the first and second clamp and are suspended; the second end of the elastic piece is in contact with the outer wall of the cable to prevent the cable from moving relative to the elastic piece in one direction, and the elastic pieces are arranged in two groups to prevent the cable from moving relative to the first hoop and the second hoop in the left and right directions.
8. The crosslinked polyethylene combustion product-based gas sensor array device of claim 7, wherein anti-slip teeth are provided at the end of the elastic sheet.
9. The crosslinked polyethylene combustion product-based gas sensor array device of claim 5, wherein an extension rod is detachably mounted between the primary rod and the secondary rod.
10. The detection method based on the crosslinked polyethylene combustion product comprises the following steps:
(1) when a cable in a cable channel is in a fire disaster, each sensor in the sensor unit acquires an abnormal signal and gives an alarm;
(2) each sensor processes the acquired signal and transmits the processed signal to the local module of the sensor unit;
(3) the local module of the sensor unit converts the signals and transmits the converted signals to the fire early warning main control room through the optical fiber;
(4) and the fire early warning main control room carries out corresponding treatment according to the fire condition, and if the fire early warning main control room sends a signal to the fire extinguishing device, the fire extinguishing device is started to extinguish the fire.
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