CN117218791A - Fire detector and fire detection system - Google Patents

Fire detector and fire detection system Download PDF

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Publication number
CN117218791A
CN117218791A CN202311306262.6A CN202311306262A CN117218791A CN 117218791 A CN117218791 A CN 117218791A CN 202311306262 A CN202311306262 A CN 202311306262A CN 117218791 A CN117218791 A CN 117218791A
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unit
fire
signal processing
infrared
fire detection
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刘星
曹勇
王年
李晶晶
郝文
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WUXI SHENGMIN SENSING TECHNOLOGY CO LTD
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WUXI SHENGMIN SENSING TECHNOLOGY CO LTD
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Priority to CN202311306262.6A priority Critical patent/CN117218791A/en
Publication of CN117218791A publication Critical patent/CN117218791A/en
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Abstract

The invention discloses a fire detector and a fire detection system, the fire detector comprises: the signal processing display module and the n fire detection modules; each fire detection module comprises a transparent detection window, an infrared temperature sensor, a distance correction unit, a dirty reporting unit and a control unit, wherein the infrared temperature sensor is positioned on one side of the inner surface of the transparent detection window; the infrared temperature sensor is used for detecting the temperature of a detected object outside the transparent detection window; the distance correction unit is used for correcting the temperature of the detected object detected by the infrared temperature sensor according to the distance between the distance correction unit and the detected object to obtain the actual temperature, and sending the actual temperature to the control unit; the dirty reporting unit is used for detecting the pollution value of the transparent detection window, and sending a dirty reporting signal to the control unit when the pollution value exceeds a set pollution threshold; the control unit is used for sending the actual temperature and the dirty report signal to the signal processing display module. The invention can accurately detect the actual temperature of the detected object and can also detect the pollution degree of the transparent detection window.

Description

Fire detector and fire detection system
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a fire detector and a fire detection system.
Background
Fire detection in industrial sites generally adopts three fire monitoring modes of a flame detector, an image type fire detector and a cable type linear temperature-sensing fire detector. The image fire detector is used for giving fire alarm through a fire image recognition system monitored by a video, is generally arranged at the upper height position around the monitored equipment in a point-type distribution manner, is linked with a fire extinguishing system, and is used for starting a fire extinguishing device arranged on site in time after the fire occurs. The cable type linear temperature-sensing fire detector utilizes the infrared heat conduction principle to sense the temperature of the contact surface of the monitored equipment, and when the temperature is abnormal, the fire early warning information is uploaded to the monitoring system.
In the above temperature measurement mode, the temperature monitoring range of the flame detector and the image detector is limited, and comprehensive and effective fire monitoring and early warning cannot be implemented. The cable type temperature-sensing fire detector is greatly influenced by the ambient temperature, is not suitable for being applied to the interior-cause fire monitoring of outdoor industrial equipment for a long time, and is difficult to install and maintain in a contact mode. In addition, the three detectors have the problems of large temperature measurement error, low temperature detection sensitivity, lag temperature measurement speed and the like.
Disclosure of Invention
The invention provides a fire detector and a fire detection system, which can accurately detect the actual temperature of an object to be detected and can also detect the pollution degree of a transparent detection window.
According to an aspect of the present invention, there is provided a fire detector including: the fire disaster detection system comprises a signal processing display module and n fire disaster detection modules, wherein n is a positive integer, and n is more than or equal to 2;
the ith fire detection module is electrically connected with the (i+1) th fire detection module, and the nth fire detection module is electrically connected with the signal processing display module, wherein i is a positive integer, and n is more than or equal to 1;
each fire detection module comprises a transparent detection window, an infrared temperature sensor, a distance correction unit, a dirty reporting unit and a control unit, wherein the infrared temperature sensor is positioned on one side of the inner surface of the transparent detection window; the infrared temperature sensor, the distance correction unit and the dirty reporting unit are electrically connected with the control unit;
the infrared temperature sensor is used for detecting the temperature of a detected object outside the transparent detection window; the distance correction unit is electrically connected with the infrared temperature sensor, and is used for correcting the temperature of the detected object detected by the infrared temperature sensor according to the distance between the distance correction unit and the detected object to obtain the actual temperature, and sending the actual temperature to the control unit; the dirty reporting unit is used for detecting a pollution value of the transparent detection window, and sending a dirty reporting signal to the control unit when the pollution value exceeds a set pollution threshold; the control unit is used for sending the actual temperature and the dirty report signal to the signal processing display module;
the signal processing display module is used for displaying the actual temperature detected by each fire detection module and the dirty signal, and also used for sending out a first alarm prompt when the actual temperature exceeds a first alarm threshold.
Optionally, each fire detection module further comprises a flame sensor;
the flame sensor is electrically connected with the control unit and is used for detecting the flame radiation intensity of the object to be detected and transmitting the flame radiation intensity into the control unit;
the control unit is used for sending the flame radiation intensity to the signal processing display module;
the signal processing display module is used for displaying the flame radiation intensity detected by each fire detection module and sending out a second alarm prompt when the flame radiation intensity exceeds a second alarm threshold value.
Optionally, each fire detection module further includes a positioning unit;
the positioning unit is electrically connected with the control unit and is used for positioning the position information of the fire detection module where the positioning unit is located and sending the position information to the control unit;
the control unit is also used for sending the position information to the signal processing display module;
the signal processing display module is also used for displaying the position information of the fire detection module, wherein the position information is used for detecting that the actual temperature exceeds a first alarm threshold value, the pollution value exceeds the set pollution threshold value and the flame radiation intensity exceeds a second alarm threshold value.
Optionally, each fire detection module further comprises a light warning unit;
the light warning unit is electrically connected with the control unit, and the control unit is used for controlling the light warning unit to send out light flickering prompts when the pollution value exceeds a set pollution threshold.
Optionally, the distance correction unit comprises a laser emission unit, a laser receiving unit, a distance measuring and calculating unit and an adaptive unit;
the laser emission unit is used for emitting first laser to the measured object;
the laser receiving unit is used for receiving the first laser reflected by the measured object;
the distance measuring and calculating unit is electrically connected with the laser transmitting unit and the laser receiving unit, and is used for determining a time interval from the first laser transmitted by the laser transmitting unit to the first laser reflected by the measured object received by the laser receiving unit, and determining the distance between the distance correcting unit and the measured object according to the time interval;
the self-adaptive unit is electrically connected with the control unit, and is used for determining the actual temperature of the measured object according to the temperature of the measured object detected by the infrared temperature sensor and the distance between the distance correction unit and the measured object, and sending the actual temperature to the control unit.
Optionally, the adaptive unit is specifically configured to determine the actual temperature of the measured object according to the following formula:
T(t)＝W(t)T1(t)；
△T(t)＝T(t)-T1(t)；
W(t+1)＝W(t)+2μ△T(t)T1(t)；
wherein T (T) is the actual temperature of the measured object at the moment T, W (T) is the approximation value of the measured object at the moment T, T1 (T) is the temperature of the measured object detected by the infrared temperature sensor at the moment T, mu is a step factor, and mu is determined according to the distance between the distance correction unit and the measured object.
Optionally, the dirty reporting unit comprises an infrared transmitting tube, an infrared receiving tube and an infrared receiving signal processing circuit;
the infrared transmitting tube is used for transmitting infrared light to the transparent detection window;
the infrared receiving tube is used for receiving infrared light reflected by the transparent detection window;
the infrared receiving signal processing circuit is electrically connected with the infrared receiving tube, and is used for generating a pollution value according to the infrared light receiving quantity of the infrared receiving tube and sending a dirty signal to the control unit when the pollution value exceeds the set pollution threshold.
Optionally, the signal processing display module comprises a display unit, an alarm unit, a key unit and a signal processing unit;
the key unit is used for receiving the set pollution threshold, the first alarm threshold and the second alarm threshold;
the signal processing unit is electrically connected with the display unit, the alarm unit and the key unit, and is used for controlling the display unit to display the actual temperature detected by each fire detection module and the dirty signal, controlling the alarm unit to send out a first alarm prompt when the actual temperature exceeds a first alarm threshold, controlling the alarm unit to send out a second alarm prompt when the flame radiation intensity exceeds a second alarm threshold, and obtaining the set pollution threshold, the first alarm threshold and the second alarm threshold, and sending the set pollution threshold to each fire detection module.
Optionally, the signal processing display module is further configured to determine whether each fire detection module fails, and control and display location information of the fire detection module with the failure.
According to another aspect of the present invention, there is provided a fire detection system including the fire detector, the fire control monitoring system and the fire control linkage control system provided by any of the embodiments of the present invention.
The implementation provides a fire detector, which comprises a signal processing display module and a plurality of fire detection modules which are electrically connected in sequence, wherein the last fire detection module is electrically connected with the signal processing display module. Each fire detection module comprises a transparent detection window, an infrared temperature sensor, a distance correction unit, a dirty reporting unit and a control unit. The infrared temperature sensor can detect the temperature of the detected object outside the transparent detection window, and the distance correction distance can correct the temperature detected by the infrared temperature sensor according to the distance between the fire detection module and the detected object, so that the actual temperature is obtained, and compared with the temperature directly detected by the infrared temperature sensor, the actual temperature is closer to the temperature of the detected object, and therefore, the fire detection module in the embodiment can improve the accuracy of detecting the actual temperature of the detected object. The dirty reporting unit can detect the pollution value of the transparent detection window, and send a dirty reporting signal to the control unit when the pollution value is larger than a set pollution threshold, and the control unit sends the dirty reporting signal to the signal processing display module. The signal processing display module can display the dirty signal in the fire detection module, so that a worker can clean the polluted transparent detection window in time after seeing the dirty signal. The signal processing display module can also send out a first alarm prompt when the actual temperature exceeds a first alarm threshold value so as to remind a worker that a measured object has or is about to generate a fire disaster. In summary, the fire detector provided in this embodiment can accurately detect the actual temperature of the object to be detected, and can also detect the pollution level of the transparent detection window.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a fire detector according to an embodiment of the present invention;
FIG. 2 is a schematic view of a fire detector according to another embodiment of the present invention;
FIG. 3 is a schematic view of a fire detector according to another embodiment of the present invention;
FIG. 4 is a schematic view of a fire detector according to another embodiment of the present invention;
fig. 5 is a schematic structural view of a fire detection module according to an embodiment of the present invention;
fig. 6 is a schematic structural view of yet another fire detection module according to an embodiment of the present invention;
fig. 7 is a schematic structural view of yet another fire detection module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an optical path of a dirty unit after power-on according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another optical path of the dirty unit after power-on according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a dirty unit according to an embodiment of the present invention;
FIG. 11 is a schematic view of a fire detector according to still another embodiment of the present invention;
fig. 12 is a schematic structural view of a fire detection system according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a fire detector according to an embodiment of the present invention, and referring to fig. 1, the fire detector provided in this embodiment includes: the system comprises a signal processing display module 100 and n fire detection modules 200, wherein n is a positive integer, and n is more than or equal to 2; the ith fire detection module 200 is electrically connected with the (i+1) th fire detection module 200, and the nth fire detection module 200 is electrically connected with the signal processing display module 100, wherein i is a positive integer, and n is more than or equal to 1. Each fire detection module 200 comprises a transparent detection window, an infrared temperature sensor 210 positioned at one side of the inner surface of the transparent detection window, a distance correction unit 220, a dirty reporting unit 230 and a control unit 240; the infrared temperature sensor 210, the distance correction unit 220 and the dirty reporting unit 230 are all electrically connected with the control unit 240; the infrared temperature sensor 210 is used for detecting the temperature of the detected object outside the transparent detection window; the distance correction unit 220 is electrically connected to the infrared temperature sensor 210, and the distance correction unit 220 is configured to correct the temperature of the measured object detected by the infrared temperature sensor 210 according to the distance between the distance correction unit 220 and the measured object to obtain an actual temperature, and send the actual temperature to the control unit 240; the dirty reporting unit 230 is configured to detect a pollution value of the transparent detection window, and send a dirty reporting signal to the control unit 240 when the pollution value exceeds a set pollution threshold; the control unit 240 is used for sending the actual temperature and the dirty signal to the signal processing display module 100; the signal processing display module 100 is configured to display an actual temperature and a dirty signal detected by each fire detection module 200, and is further configured to send out a first alarm prompt when the actual temperature exceeds a first alarm threshold.
Specifically, the i-th fire detection module 200 is adjacent to the i+1th fire detection module 200, two adjacent fire detection modules 200 are connected by a first signal line 310 and a second signal line 320, and the last fire detection module 200 is also electrically connected with the signal processing display module 100 by the first signal line 310 and the second signal line 320. The first signal line 310 may transmit the related information detected by the fire detection module 200 to the signal processing display module 100, and the first signal line 310 may transmit the actual temperature and the dirty signal to the signal processing display module 100, for example. The second signal line 320 may transmit information of the signal processing display module 100 controlling each fire detection module 200 to each fire detection module 200, and the second signal line 100 may transmit a set pollution threshold to each fire detection module 200, for example.
In this embodiment, a plurality of fire detection modules 200 are disposed in the fire detector, and the distance between two adjacent fire detection modules 200 may be 5 meters, so as to perform fire detection on the object to be detected in a long distance, and improve the fire detection range.
Infrared light generated by the infrared temperature sensor 210 can be transmitted to the surface of the object to be detected through the transparent detection window to detect the temperature of the object to be detected. The infrared temperature sensor 210 can quickly obtain the surface temperature of the object to be measured at a long distance, and considering that when the infrared temperature sensor 210 performs temperature measurement, the temperature measurement result will have a larger error due to a longer measurement distance, so the distance correction unit 220 is added in the fire detector in this embodiment. The distance correction unit 220 may measure the distance from the distance correction unit 220 to the measured object by using a pulse laser ranging technology, and correct the temperature detected by the infrared temperature sensor 210 according to the measured distance, so as to reduce the measurement error of the infrared temperature sensor 210 caused by the measured distance, and improve the accuracy of detecting the actual temperature of the measured object by the fire detection module 200. The temperature corrected by the distance correcting unit 220 is the actual temperature of the measured object.
During the long-term use of the fire detection module 200, dust and smoke in the air may pollute the fire detection module 200, which results in reduced visibility of the transparent detection window and affects the detection accuracy of the fire detection module 200. The dirty unit 230 in this embodiment can detect the contamination level of the transparent detection window surface. When the dirty reporting unit 230 operates, the dirty reporting unit 230 may detect a contamination value of the transparent detection window, and the contamination value may reflect a contamination level of the transparent detection window. The dirty reporting unit 230 may also send a dirty reporting signal to the control unit 240 when the pollution value is greater than the set pollution threshold, where the control unit 240 indicates that the current transparent detection window is seriously polluted after receiving the dirty reporting signal, and the control unit 240 sends the dirty reporting signal to the signal processing display module 100, where the signal processing display module 100 displays the dirty reporting signal, so that a worker can timely process and maintain the fire detection module 200 with severely polluted condition after seeing the dirty reporting signal.
The signal processing display module 100 sends out a first alarm prompt when the actual temperature exceeds a first alarm threshold value so as to prompt the working personnel that the measured object is about to fire or has fired. The first alarm prompt can be an audio prompt or a light prompt. The signal processing display module 100 may also store the actual temperatures sent by the fire detection modules 200, and display the actual temperatures at the current time of the measured object and the historical actual temperature curves.
Because the accumulation of the contaminants on the surface of the transparent detection window requires a certain period of time, the dirty reporting unit 230 can be set to be powered on for a period of time in a working period and then to be powered off for a period of time, so that the contamination value of the transparent detection window can be detected, and the electric energy can be saved. The signal processing display module 100 may control the energization time period of the dirty unit 230 in each fire detection module 200 through the second signal line 320. Specifically, the signal processing display module 100 may control the power-on duration and the power-off duration of the dirty unit 230 through the control unit 240 according to the environmental condition of the fire detection module 200, and illustratively, when the environment of the fire detection module 200 is relatively clean, the signal processing display module 100 may control the power-on duration of the dirty unit 230 to be shorter in a working period, and when the environment dust of the fire detection module 200 is relatively larger, the signal processing display module 100 may control the power-on duration of the dirty unit 230 to be longer in a working period, and the power-off duration to be shorter.
The implementation provides a fire detector, which comprises a signal processing display module and a plurality of fire detection modules which are electrically connected in sequence, wherein the last fire detection module is electrically connected with the signal processing display module. Each fire detection module comprises a transparent detection window, an infrared temperature sensor, a distance correction unit, a dirty reporting unit and a control unit. The infrared temperature sensor can detect the temperature of the detected object outside the transparent detection window, and the distance correction distance can correct the temperature detected by the infrared temperature sensor according to the distance between the fire detection module and the detected object, so that the actual temperature is obtained, and compared with the temperature directly detected by the infrared temperature sensor, the actual temperature is closer to the temperature of the detected object, and therefore, the fire detection module in the embodiment can improve the accuracy of detecting the actual temperature of the detected object. The dirty reporting unit can detect the pollution value of the transparent detection window, and send a dirty reporting signal to the control unit when the pollution value is larger than a set pollution threshold, and the control unit sends the dirty reporting signal to the signal processing display module. The signal processing display module can display the dirty signal in the fire detection module, so that a worker can clean the polluted transparent detection window in time after seeing the dirty signal. The signal processing display module can also send out a first alarm prompt when the actual temperature exceeds a first alarm threshold value so as to remind a worker that a measured object has or is about to generate a fire disaster. In summary, the fire detector provided in this embodiment can accurately detect the actual temperature of the object to be detected, and can also detect the pollution level of the transparent detection window.
Based on the above embodiments, optionally, fig. 2 is a schematic structural diagram of yet another fire detector provided according to an embodiment of the present invention, and referring to fig. 2, each fire detection module 200 further includes a flame sensor 250; the flame sensor 250 is electrically connected with the control unit 240, and the flame sensor 250 is used for detecting the flame radiation intensity of the object to be detected and transmitting the flame radiation intensity to the control unit 240; the control unit 240 is used for sending the flame radiation intensity into the signal processing display module 100; the signal processing display module 100 is configured to display the intensity of flame radiation detected by each fire detection module 200, and further configured to issue a second alarm prompt when the intensity of flame radiation exceeds a second alarm threshold.
Specifically, the flame sensor 250 and the infrared temperature sensor 210 are located on the same side of the transparent detection window, and the flame sensor 250 can detect the flame radiation intensity of the object after the object has a fire. The signal processing display module 100 may also store the flame radiation intensity detected by each fire detection module 200, and display a curve of the flame radiation intensity detected by each fire detection module 200 at the current time and the historical flame radiation intensity.
The signal processing display module 100 provided in this embodiment may be provided with a two-stage alarm mode, where the one-stage alarm mode is an extremely early stage of fire, and is configured to send out a first alarm prompt when the fire detection module 200 detects that the actual temperature of the measured object exceeds the first alarm threshold. The second alarm mode is an initial stage of fire disaster, and sends out a second alarm prompt when the fire detection module 200 detects that the flame radiation intensity of the detected object exceeds a second alarm threshold, wherein the second alarm prompt can be an acoustic prompt or a lamplight prompt. The first alarm prompt is different from the second alarm prompt, and illustratively, the first alarm prompt may emit red light for the LED lamp in the signal processing display module 100, and the second alarm prompt may emit green light for the LED lamp in the signal processing display module 100. The infrared temperature sensor 210 and the flame sensor 250 in this embodiment are both MEMS-level, so that the volume of the fire detection module 200 can be reduced.
Based on the above embodiments, optionally, fig. 3 is a schematic structural diagram of yet another fire detector according to an embodiment of the present invention, and referring to fig. 3, each fire detection module 200 further includes a positioning unit 260; the positioning unit 260 is electrically connected to the control unit 240, and the positioning unit 260 is configured to position the location information of the fire detection module 200 where the positioning unit 260 is located and send the location information to the control unit 240; the control unit 240 is further configured to send the location information to the signal processing display module 100; the signal processing display module 100 is further configured to display location information of the fire detection module 200 that detects that the actual temperature exceeds the first alarm threshold, that the pollution value exceeds the set pollution threshold, and that the flame radiation intensity exceeds the second alarm threshold.
Specifically, each fire detection module 200 has its location information, and when the location of each fire detection module 200 is different, the location information of each fire detection module 200 will be different. When the actual temperature detected by the fire detection module 200 exceeds the first alarm threshold, the signal processing display module 100 displays the position information of the fire detection module 200, and a worker can search the corresponding fire detection module 200 according to the position information, thereby finding a subject to be or having developed a fire. When the pollution value detected by the fire detection module 200 exceeds the set pollution threshold, the signal processing display module 100 displays the position information of the fire detection module 200, so that a worker can conveniently find the polluted fire detection module 200 according to the position information. When the intensity of flame radiation detected by the fire detection module 200 exceeds the second alarm threshold, the signal processing display module 100 displays the position information of the fire detection module 200, and a worker can search the corresponding fire detection module 200 according to the position information, so as to find a detected object in which a fire has occurred. Therefore, the fire detector provided in this embodiment can facilitate the staff to find the location of the object to be detected with higher temperature, the location of the object to be detected with fire, and the location of the fire detection module 200 with serious contamination of the transparent detection window. The positioning unit 260 may be a GPS positioner or a beidou positioner.
Optionally, fig. 4 is a schematic structural diagram of another fire detector according to an embodiment of the present invention, and referring to fig. 4, each fire detection module 200 further includes a light warning unit 270; the light warning unit 270 is electrically connected to the control unit 240, and the control unit 240 is configured to control the light warning unit 270 to emit a light flicker prompt when the pollution value exceeds the set pollution threshold.
Specifically, the light warning unit 270 may be an LED lamp. When the pollution value exceeds the set pollution threshold value, the transparent detection window is seriously polluted, and the detection precision of the infrared temperature sensor, the distance correction unit and the flame sensor can be influenced. In this embodiment, the setting control unit 240 controls the light warning unit 270 to give out a light flashing prompt when the pollution value exceeds the set pollution threshold, so as to remind the staff to quickly locate the position of the polluted transparent detection window.
Alternatively, fig. 5 is a schematic structural diagram of a fire detection module according to an embodiment of the present invention, and referring to fig. 5, a distance correction unit 220 includes a laser emitting unit 221, a laser receiving unit 222, a distance measuring and calculating unit 223, and an adaptive unit 224; the laser emission unit 221 is configured to emit a first laser to an object to be measured; the laser receiving unit 222 is configured to receive the first laser reflected by the measured object; the distance measuring and calculating unit 223 is electrically connected with the laser transmitting unit 221 and the laser receiving unit 222, and the distance measuring and calculating unit 223 is used for determining a time interval from when the laser transmitting unit 221 transmits the first laser to when the laser receiving unit 222 receives the first laser reflected by the measured object, and determining the distance from the distance correcting unit 220 to the measured object according to the time interval; the adaptive unit 224 is electrically connected to the control unit 240, and the adaptive unit 224 is configured to determine an actual temperature of the measured object according to the temperature of the measured object detected by the infrared temperature sensor 210 and the distance from the distance correction unit 220 to the measured object, and send the actual temperature to the control unit 240.
In particular, the laser emitting unit 221 may be composed of a semiconductor pulse diode, a pulsed laser diode driver, and a programmable single pulse generator.
The laser light receiving unit 222 includes an avalanche diode for detecting the first laser light and an operational amplifier. The operational amplifier converts the current signal collected by the avalanche diode into a voltage signal, amplifies the voltage signal, and sends the voltage signal to the distance measuring and calculating unit 223. The distance measuring and calculating unit 223 includes a timer and a distance calculator, and the timer may employ a high-precision time precision acquisition chip. When the laser light emitting unit 221 starts to emit the first laser light, the timer starts to count, and when the distance measuring unit 223 receives the voltage signal, the timer stops counting, so that a time interval from the laser light emitting unit 221 to the laser light receiving unit 222 receiving the first laser light reflected by the object to be measured can be determined. The distance calculator divides the product of the calculated time interval and the speed of light by 2 to obtain the distance from the distance correction unit 220 to the measured object.
The adaptive unit 224 performs corresponding temperature compensation or correction on the measured distance to obtain an actual temperature of the measured object with smaller error, and sends the actual temperature to the control unit 240.
Optionally, the adaptive unit is specifically configured to determine the actual temperature of the measured object according to the following formula:
T(t)＝W(t)T1(t)；
△T(t)＝T(t)-T1(t)；
W(t+1)＝W(t)+2μ△T(t)T1(t)；
wherein T (T) is the actual temperature of the measured object at the moment T, W (T) is the approximation value of the measured object at the moment T, T1 (T) is the temperature of the measured object detected by the infrared temperature sensor at the moment T, mu is a step factor, and mu is determined according to the distance between the distance correction unit and the measured object.
Specifically, the infrared temperature sensor detects that the temperature of the measured object at the moment T is T1 (T), W (T) is an approximation value of the moment, and T (T) is a temperature value output by the fire detection module, namely the actual temperature. And the temperature approximation value W (t+1) at the next moment is self-adapted through the error DeltaT (T) between the actual temperature output by the fire detection module and the temperature output by the infrared temperature sensor, so that the T (t+1) is more close to the actual temperature value.
If the distance between the distance correction unit and the measured object is directly utilized to obtain the final actual temperature of the measured object, a larger error exists, and alarm delay is caused, in this embodiment, an adaptive unit is specially added, and based on an advanced distance detection test, a minimum mean square error algorithm is adopted for the adaptive unit, so that the detected temperature values of the distances between different distance correction units and the measured object are infinitely approximated to the actual temperature value of the measured object, a more accurate corresponding relation between the distance and the temperature correction is established, and the accuracy of temperature detection of the fire detector is improved. The step factor mu is related to the distance between the distance correction unit and the measured object and the field environment temperature of the measured object, and can be determined through fitting, wherein the fitting process is as follows: and acquiring the temperatures of a plurality of groups of measured objects with different distances on site by using an infrared temperature sensor, and fitting the time, the distances and the temperatures to obtain a fitting curve. The self-adaptive unit searches the corresponding step factor mu according to the distance between the distance correction unit and the measured object and the temperature detected by the temperature sensor, and finally determines the actual temperature of the measured object.
Optionally, fig. 6 is a schematic structural diagram of another fire detection module according to an embodiment of the present invention, and referring to fig. 6, a dirty unit 230 includes an infrared transmitting tube 231, an infrared receiving tube 232, and an infrared receiving signal processing circuit 233; the infrared transmitting tube 231 is used for transmitting infrared light to the transparent detection window; the infrared receiving tube 232 is used for receiving infrared light reflected by the transparent detection window; the infrared receiving signal processing circuit 233 is electrically connected to the infrared receiving tube 232, and the infrared receiving signal processing circuit 233 is configured to generate a pollution value according to the amount of infrared light received by the infrared receiving tube 232, and send a pollution report signal to the control unit 240 when the pollution value exceeds a set pollution threshold.
Specifically, the dirty unit 230 is disposed in the interior cavity of the fire detection module 200. Fig. 7 is a schematic structural diagram of another fire detection module according to an embodiment of the present invention, and referring to fig. 7, an infrared emitting tube 231 and an infrared receiving tube 232 may be disposed at two equidistant ends of the center of a transparent detection window 201, respectively emitting and receiving infrared light to the inner surface of the transparent detection window 201. The infrared transmitting tube 231 in the dirty reporting unit 230 can set the power-on time, the power-off time and the dirty reporting threshold according to the clean environment of the site, and after the power-on, the infrared transmitting tube 231 transmits infrared light with fixed wavelength, and the infrared receiving tube 232 receives the infrared light reflected by the inner surface of the transparent detection window 201.
Fig. 8 is a schematic light path diagram of the dirty reporting unit after being powered on according to an embodiment of the present invention, fig. 9 is a schematic light path diagram of the dirty reporting unit after being powered on according to an embodiment of the present invention, fig. 8 shows a schematic light path diagram of the surface of the transparent detection window 201 without pollution, fig. 9 shows a schematic light path diagram of the surface of the transparent detection window 201 with pollution, referring to fig. 8, when the outer surface of the transparent detection window 201 is free from pollution, most of the infrared light emitted by the infrared emitting tube 231 is emitted through the transparent detection window 201, and a small portion of the infrared light is reflected to the infrared receiving tube 232 through the inner surface of the transparent detection window 201, and at this time, the infrared light received by the infrared receiving tube 232 is weak, that is, the amount of the infrared light is small.
Referring to fig. 9, when the outer surface of the transparent detection window 201 has contaminants, a small amount of infrared light emitted by the infrared emission tube 231 is emitted through the transparent detection window 201, and most of the infrared light is reflected to the infrared receiving tube 232 through the inner surface of the transparent detection window 201, and at this time, the infrared light received by the infrared receiving tube 232 is stronger, that is, the amount of infrared light is larger.
Fig. 10 is a schematic diagram of a dirty report unit according to an embodiment of the present invention, referring to fig. 10, an infrared receiving signal processing circuit 233 includes a resistor R, where the resistor R is a high-precision resistor, an infrared receiving tube 232 is connected in series with the resistor R, and the voltage V across the resistor R is caused by the intensity of infrared light received by the infrared receiving tube 232 SS Is a variation of (c). When the pollution is weak, the circuit current of the infrared receiving tube 232 is small, and the voltage V at the two ends of the resistor R SS When the pollution is small and strong, the circuit current of the infrared receiving tube 232 is large, and the voltage V at the two ends of the resistor R SS Larger. Therefore, the infrared receiving signal processing circuit 233 can respond to the resistor RThe voltage or current at two ends judges the pollution degree. And if the electrical parameter exceeding the set pollution threshold is detected, sending a dirty signal to the signal processing display module, and flashing and prompting through an LED lamp in the fire detection module.
Optionally, fig. 11 is a schematic structural view of still another fire detector provided according to an embodiment of the present invention, and referring to fig. 11, the signal processing display module 100 includes a display unit 110, an alarm unit 120, a key unit 130, and a signal processing unit 140; the key unit 130 is configured to receive the set pollution threshold, the first alarm threshold, and the second alarm threshold; the signal processing unit 140 is electrically connected to the display unit 110, the alarm unit 120, and the key unit 130, and the signal processing unit 140 is configured to control the display unit 110 to display the actual temperature and the dirty signal detected by each fire detection module 200, and is further configured to control the alarm unit 120 to issue a first alarm prompt when the actual temperature exceeds a first alarm threshold, control the alarm unit 120 to issue a second alarm prompt when the flame radiation intensity exceeds a second alarm threshold, and is further configured to obtain the set pollution threshold, the first alarm threshold, and the second alarm threshold, and send the set pollution threshold to each fire detection module 200.
Specifically, the staff may set the pollution threshold, the first alarm threshold, and the second alarm threshold through the key unit 130, and the key unit 130 may be a keyboard. The alarm unit 120 may include a horn and/or an LED lamp. The display unit 110 may be an OLED display screen. The signal processing unit 140 is electrically connected to the control unit 240 in each fire detection module 200, and the signal processing unit 140 may transmit a set pollution threshold to each fire detection module 200, and the signal processing unit 140 may also receive the location information of each fire detection module 200 and control the display unit 110 to display the location information of each fire detection module 200.
Optionally, the signal processing display module is further configured to determine whether each fire detection module fails, and control and display location information of the fire detection module with the failure.
Specifically, the signal processing display module may detect whether the fire detection module has a fault according to the actual temperature sent by each fire detection module, and, illustratively, when the actual temperature sent by the fire detection module is abnormal, the signal processing display module may determine that the fire detection module has a fault. After the fire detection module breaks down, the signal processing display module timely displays the position information of the fire detection module with faults, so that workers can conveniently maintain the fire detection module with faults in time.
It should be noted that, the connection between the light warning unit, the positioning unit, the flame sensor, the infrared temperature sensor, the distance correction unit and the dirty reporting unit described in this embodiment and the control unit refers to the connection relationship between the devices in the same fire detection module, and the control unit in one fire detection module is not electrically connected with the light warning unit, the positioning unit, the flame sensor, the infrared temperature sensor, the distance correction unit and the dirty reporting unit in another fire detection module.
Fig. 12 is a schematic structural diagram of a fire detection system according to an embodiment of the present invention, and referring to fig. 12, the fire detection system according to the present embodiment includes a fire detector 300, a fire control monitoring system 400, and a fire control coordinated control system 500 according to any embodiment of the present invention.
Specifically, the signal processing display module in the fire detector 300 transmits the detection information to the fire-fighting monitoring system 400 for real-time monitoring, the fire-fighting monitoring system 400 is connected with the fire-fighting linkage control system 500 through a Modbus protocol, and the fire-fighting linkage control system 500 can implement fire-extinguishing control on the ignition part of the detected object in the industrial field. The detection information comprises position information, actual temperature, flame radiation intensity, dirty information and the like transmitted by each fire detection module.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A fire detector, comprising: the fire disaster detection system comprises a signal processing display module and n fire disaster detection modules, wherein n is a positive integer, and n is more than or equal to 2;
the ith fire detection module is electrically connected with the (i+1) th fire detection module, and the nth fire detection module is electrically connected with the signal processing display module, wherein i is a positive integer, and n is more than or equal to 1;
each fire detection module comprises a transparent detection window, an infrared temperature sensor, a distance correction unit, a dirty reporting unit and a control unit, wherein the infrared temperature sensor is positioned on one side of the inner surface of the transparent detection window; the infrared temperature sensor, the distance correction unit and the dirty reporting unit are electrically connected with the control unit;
the infrared temperature sensor is used for detecting the temperature of a detected object outside the transparent detection window; the distance correction unit is electrically connected with the infrared temperature sensor, and is used for correcting the temperature of the detected object detected by the infrared temperature sensor according to the distance between the distance correction unit and the detected object to obtain the actual temperature, and sending the actual temperature to the control unit; the dirty reporting unit is used for detecting a pollution value of the transparent detection window, and sending a dirty reporting signal to the control unit when the pollution value exceeds a set pollution threshold; the control unit is used for sending the actual temperature and the dirty report signal to the signal processing display module;
the signal processing display module is used for displaying the actual temperature detected by each fire detection module and the dirty signal, and also used for sending out a first alarm prompt when the actual temperature exceeds a first alarm threshold.
2. The fire detector of claim 1, wherein each of the fire detection modules further comprises a flame sensor;
the flame sensor is electrically connected with the control unit and is used for detecting the flame radiation intensity of the object to be detected and transmitting the flame radiation intensity into the control unit;
the control unit is used for sending the flame radiation intensity to the signal processing display module;
the signal processing display module is used for displaying the flame radiation intensity detected by each fire detection module and sending out a second alarm prompt when the flame radiation intensity exceeds a second alarm threshold value.
3. The fire detector of claim 2, wherein each of the fire detection modules further comprises a locating unit;
the positioning unit is electrically connected with the control unit and is used for positioning the position information of the fire detection module where the positioning unit is located and sending the position information to the control unit;
the control unit is also used for sending the position information to the signal processing display module;
the signal processing display module is also used for displaying the position information of the fire detection module, wherein the position information is used for detecting that the actual temperature exceeds a first alarm threshold value, the pollution value exceeds the set pollution threshold value and the flame radiation intensity exceeds a second alarm threshold value.
4. The fire detector of claim 1, wherein each of the fire detection modules further comprises a light warning unit;
the light warning unit is electrically connected with the control unit, and the control unit is used for controlling the light warning unit to send out light flickering prompts when the pollution value exceeds a set pollution threshold.
5. The fire detector of claim 1, wherein the distance correction unit comprises a laser emitting unit, a laser receiving unit, a distance measuring unit, and an adaptive unit;
the laser emission unit is used for emitting first laser to the measured object;
the laser receiving unit is used for receiving the first laser reflected by the measured object;
the distance measuring and calculating unit is electrically connected with the laser transmitting unit and the laser receiving unit, and is used for determining a time interval from the first laser transmitted by the laser transmitting unit to the first laser reflected by the measured object received by the laser receiving unit, and determining the distance between the distance correcting unit and the measured object according to the time interval;
the self-adaptive unit is electrically connected with the control unit, and is used for determining the actual temperature of the measured object according to the temperature of the measured object detected by the infrared temperature sensor and the distance between the distance correction unit and the measured object, and sending the actual temperature to the control unit.
6. The fire detector of claim 5, wherein the adaptation unit is specifically configured to determine the actual temperature of the object under test according to the following formula:
T(t)＝W(t)T1(t)；
△T(t)＝T(t)-T1(t)；
W(t+1)＝W(t)+2μ△T(t)T1(t)；
wherein T (T) is the actual temperature of the measured object at the moment T, W (T) is the approximation value of the measured object at the moment T, T1 (T) is the temperature of the measured object detected by the infrared temperature sensor at the moment T, mu is a step factor, and mu is determined according to the distance between the distance correction unit and the measured object.
7. The fire detector of claim 1, wherein the dirty reporting unit comprises an infrared transmitting tube, an infrared receiving tube, and an infrared receiving signal processing circuit;
the infrared transmitting tube is used for transmitting infrared light to the transparent detection window;
the infrared receiving tube is used for receiving infrared light reflected by the transparent detection window;
the infrared receiving signal processing circuit is electrically connected with the infrared receiving tube, and is used for generating a pollution value according to the infrared light receiving quantity of the infrared receiving tube and sending a dirty signal to the control unit when the pollution value exceeds the set pollution threshold.
8. The fire detector of claim 2, wherein the signal processing display module comprises a display unit, an alarm unit, a key unit, and a signal processing unit;
the key unit is used for receiving the set pollution threshold, the first alarm threshold and the second alarm threshold;
the signal processing unit is electrically connected with the display unit, the alarm unit and the key unit, and is used for controlling the display unit to display the actual temperature detected by each fire detection module and the dirty signal, controlling the alarm unit to send out a first alarm prompt when the actual temperature exceeds a first alarm threshold, controlling the alarm unit to send out a second alarm prompt when the flame radiation intensity exceeds a second alarm threshold, and obtaining the set pollution threshold, the first alarm threshold and the second alarm threshold, and sending the set pollution threshold to each fire detection module.
9. A fire detector according to claim 3, wherein the signal processing display module is further adapted to determine whether each of the fire detection modules has failed and control and display location information of the failed fire detection module.
10. A fire detection system comprising a fire detector as claimed in any one of claims 1 to 9, a fire monitoring system and a fire coordinated control system.
CN202311306262.6A 2023-10-09 2023-10-09 Fire detector and fire detection system Pending CN117218791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311306262.6A CN117218791A (en) 2023-10-09 2023-10-09 Fire detector and fire detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311306262.6A CN117218791A (en) 2023-10-09 2023-10-09 Fire detector and fire detection system

Publications (1)

Publication Number Publication Date
CN117218791A true CN117218791A (en) 2023-12-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311306262.6A Pending CN117218791A (en) 2023-10-09 2023-10-09 Fire detector and fire detection system

Country Status (1)

Country Link
CN (1) CN117218791A (en)

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