CN111899494A - Quantitative detection device and method for point-type smoke-sensing fire detector - Google Patents
Quantitative detection device and method for point-type smoke-sensing fire detector Download PDFInfo
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Abstract
The invention provides a quantitative detection device and method for a point-type smoke-sensing fire detector, and relates to the technical field of smoke and fire detection. The device comprises a detection end, a control end and a tripod; the method overcomes the defects that the traditional detection device cannot accurately judge the response degree of the fire alarm system to the fire signal on site and cannot accurately and objectively evaluate the true protection degree of the detection system on the occasion, and has the advantages of easy operation, short measurement period, high precision and the like, and meanwhile, the method is convenient to carry, simple and convenient to apply and maintain, and stable and reliable in performance.
Description
Technical Field
The invention relates to the technical field of smoke and fire detection, in particular to a quantitative detection device and method for a point-type smoke-sensing fire detector.
Background
The point type smoke-sensitive fire detector is the most common fire detector currently applied, is a main device in an automatic fire alarm system, has different application environmental conditions, complex interference conditions, working reliability, stability of main parameters and other comprehensive performances, and is a key factor for determining the performance of the whole automatic fire alarm system. The engineering application of the existing point type smoke fire detector has the following characteristics:
1) with the continuous increase of new buildings, the number of point-type smoke detectors which are newly installed and used in China every year is large and can reach tens of millions;
2) a large number of point-type smoke detectors that have been installed for use have long contaminated or are approaching their useful life. Since the eighties, the detectors used in engineering are installed, most of the detectors reach the pollution limit due to different use environments, and the maintenance is urgently needed.
3) The concentration of the smoke source for detecting the existing smoke adding device is uncontrollable and not environment-friendly. At present, the cigarette adding device used in the field of fire engineering detection in China generally adopts incense sticks, mosquito-repellent incense and the like as a cigarette source, so that the smoke quantity is not controllable, and the smoke adding device has certain pollution to a detector and the environment.
4) No smoke detector field quantitative detection device exists in China. At present, smoke adding devices used in the field of fire engineering detection in China all have the alarm function of a qualitative detection detector, and cannot quantitatively measure the response threshold of the detector.
The national fire alarm Specification NFPA72 is the only commonly used fire alarm code in the United states. The regulations stipulate that all installed smoke detectors must be visually inspected up to half a year after the initial acceptance test and annual functional tests up to one year after the acceptance test. And it must be ensured that the sensitivity of each smoke detector is within its registered sensitivity range, and if the detector sensitivity is found to be outside its registered sensitivity range, it must be cleaned, recalibrated or replaced.
For the field detection of point-type smoke fire detectors in China, a series of regulations are made in the following national standards and specifications:
(1) the article 6.2.1 in GA 588-.
(2) The 4.3.1.1 th and 5.3.1.1 th article in GA 503 + 2004 technical Specification for detection of fire protection facilities in buildings stipulate that point-type smoke and fire detectors should be able to perform alarm function, fire transmission function, alarm confirmation lamp display function, etc.
(3) The 4.4.2 article in GB 50166 and 2014 fire automatic alarm system construction and acceptance Specification stipulates the debugging of the point type smoke fire detector, and the 5.1.5 and 5.1.9 article stipulate the field judgment and acceptance method of the point type smoke fire detector.
(4) GB 29837 article 3.3.2 in 2013 repair, maintenance and scrapping of fire detection alarm products stipulates that a response threshold test should be carried out after a smoke detector is repaired. The detector response threshold should be calibrated after the 4.3.2 regulation clean.
In the above national standards and specifications, the spot type smoke fire detector in the engineering field requires the use functions of alarming, resetting and the like. The response threshold tests specified in GB 29837 and 2013 are all carried out in a laboratory. The response threshold is the most important performance index of spot type smoke-sensitive fire detector in field application, and is directly related to the response time of the detector to fire and the stable operation of a fire detection alarm system.
Due to the limitation of the current field detection technology, the response threshold value of the point-type smoke fire detector cannot be accurately measured at the engineering field in China. The method for testing by burning a cigarette or a cigarette filler is commonly used at present, and has the following outstanding problems:
1) the smoke source of the equipment has neither stability nor repeatability and reproducibility, and the field test result is not consistent with or comparable with the standard test of a laboratory;
2) the smoke quantity generated by igniting the cigarette or the smoke adding device can not be quantitatively controlled, and a measure for measuring the smoke concentration in an engineering field is lacked, so that whether a fire detector achieves the corresponding fire detection response performance can not be quantitatively judged;
3) the ignition cigarette detection mode is very labor-consuming and low in detection efficiency, so that the workload of system engineering debugging, acceptance and maintenance is very large.
The above problems directly result in that the response degree of the fire alarm system to the fire signal on site cannot be accurately judged at present, and the true protection degree of the detection system on the site cannot be accurately and objectively evaluated. And the mode of sealing the on-site detector to a special detection mechanism for inspection lacks scientificity, rationality and operability.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a quantitative detection device and a method for a point-type smoke-sensing fire detector.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in one aspect, the invention provides a quantitative detection device for a point-type smoke-sensing fire detector, which comprises a detection end, a control end and a tripod, wherein the detection end is connected with the control end;
the detection end comprises a reflector, a smoke collecting hood, a smoke generation flue, a smoke adding fan, a smoke generation module, a detection light path cavity, a detection module, a two-way switch, a battery pack, an exhaust fan, a smoke generation module air chamber and a battery cabin; the reflecting plate is formed by die pressing of a high-precision hexagonal mold core, is arranged right above the detection light path cavity in the smoke collecting hood and is used for reflecting infrared light to form a small-size light path; the detection light path cavity is made of ferrous metal and is connected with the reflector and the detection module to detect the brightness attenuation condition of light rays in the closed cover; the smoke collecting hood is formed by die pressing of a transparent acrylic material and is arranged above the smoke generating flue and the detection light path cavity, and the quantitative detection device of the point type smoke fire detector is wrapped in the smoke collecting hood to form a completely closed space; the detection module is arranged right below the detection light path cavity and used for detecting the change of the attenuation value on the light path; the reflector and the detection module are both vertically arranged with the central line of the detection light path cavity; the smoke adding fan is arranged right below the smoke generating flue and used for conveying smoke generated by the smoke generating module after the smoke is premixed into the smoke collecting hood through the smoke generating flue; the smoke generating flue is made of ferrous metal, and the smoke generating module is arranged in the air chamber of the smoke generating module below the smoke adding fan; the battery pack is arranged in the battery bin, one side of the battery bin is connected with the smoke generating module, and the exhaust fan is arranged below the detection module and used for exhausting smoke in the detection end; the two-way switch is arranged between the exhaust fan and the detection module and is used for controlling the detection end circuit, the smoke generating module and the battery pack;
the smoke generating module is composed of a liquid storage chamber, a smoke heating device and a fan, the fan is installed at the lower part of the liquid storage chamber, the smoke heating device is installed at the upper part of the liquid storage chamber, and the liquid storage chamber is connected with the smoke heating device through oil absorption cotton;
the detection module is composed of a biconvex lens, a background infrared LED, a detection infrared LED, an infrared receiving tube, a signal processing light source driving circuit board and a lens module; the double-convex lens is arranged at the bottom of the lens module cavity, is parallel to the reflector and comprises a first lens and a second lens, the first lens is used for converging and detecting light rays of the infrared LED light-emitting tube light source reflected by the reflector and focusing the light rays onto the infrared receiving tube, and the second lens is used for converging and detecting infrared light emitted by the infrared LED light-emitting tube; the lens module is fixed on the surface of the signal processing light source driving circuit board; the signal processing light source driving circuit board is embedded with a signal processing circuit and a photoelectric tube driving circuit, the photoelectric tube driving circuit is respectively connected with the signal processing circuit and the infrared receiving tube, and the background infrared LED luminous tube, the detection infrared LED luminous tube and the infrared receiving tube are all welded on the surface of the signal processing light source driving circuit board; the infrared receiving tube is arranged at the top of the cavity where the first lens of the lens module is located; detecting that the infrared LED is arranged at the top of the cavity where the second lens of the lens module is located; the axes of the background infrared LED luminous tube and the infrared receiving tube are parallel to the cavity of the lens module and are vertical to the biconvex lens, and the light source emitted by the background infrared LED luminous tube is directly received by the infrared receiving tube.
The control end comprises a control end shell, a control end circuit board, a liquid crystal display, a buzzer, a control key, a portable hook, a hanging rope, a switch and a charging hole, wherein the control end circuit board is arranged in the control end shell, and the liquid crystal display is arranged on the control end circuit board and used for displaying detection data and software functions; the buzzer and the control key are welded on the control end circuit board; the liquid crystal display, the buzzer and the control key are provided with corresponding holes on the control end shell; the switch and the charging hole are fixed on the surface of the control end shell; the portable hook is fixed on the opposite side surface of the control end shell, and the hanging rope is connected to the hook;
the buzzer outputs a prompt tone when the control end is in key operation and the battery is in a low-power state; the six keys of the control key are respectively upward, downward, quit, confirm, stop and start; the switch is used for controlling the connection between the control end circuit and the battery pack; the charging hole is used for controlling the charging of the end battery.
The tripod is composed of a connecting piece, a tripod and a supporting piece, wherein the connecting piece is connected with the detection end through a bayonet, the tripod is connected with the supporting piece through the bayonet and is used for fixing a supporting frame, the supporting frame is of a 5-section telescopic type, and two adjacent sections are fixedly connected through the bayonet;
on the other hand, the quantitative detection method of the point-type smoke fire detector is realized by the quantitative detection device of the point-type smoke fire detector, and comprises the following steps: the method comprises the following steps:
step 1: inputting smoke into the smoke and fire detection area by controlling the smoke generating device, and creating a simulated smoke environment in the detection area;
and 3, finishing detection when the quantitative detection device of the smoke-sensitive fire detector generates an alarm action, wherein the smoke concentration corresponding to the moment is the field test response threshold of the point-type smoke-sensitive fire detector.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the quantitative detection device and the method for the point-type smoke-sensing fire detector overcome the defects that the traditional detection device cannot accurately judge the response degree of a fire alarm system to a fire signal on site and cannot accurately and objectively evaluate the true protection degree of the detection system on the site, and have the advantages of easiness in operation, short measurement period, high precision and the like.
Drawings
FIG. 1 is a schematic diagram of a quantitative detection device of a point-type smoke detector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a detection end according to an embodiment of the present invention;
in the figure, 1-a reflecting plate, 2-a smoke collecting hood, 3-a smoke generating flue, 4-a smoke adding fan, 5-a smoke generating module, 6-a detection light path cavity, 7-a detection module, 8-a two-way switch, 9-a battery pack and 10-an exhaust fan;
FIG. 3 is a schematic diagram of a detection module according to an embodiment of the present invention;
in the figure, 11-a first lens, 12-a background infrared LED light-emitting tube, 13-an infrared receiving tube, 14-a signal processing circuit, 15-a photoelectric tube driving circuit, 16-a detection infrared LED light-emitting tube, 17-a lens module and 18-a second lens;
FIG. 4 is a schematic diagram of a control end according to an embodiment of the present invention;
in the figure, 19-liquid crystal display, 20-buzzer, 21-control key, 22-portable hook, 23-switch, 24-charging hole;
fig. 5 is a flowchart of the control of the lower computer according to the embodiment of the present invention;
FIG. 6 is a flowchart illustrating a control procedure of a host computer according to an embodiment of the present invention;
FIG. 7 is a schematic block diagram of a detection end according to an embodiment of the present invention;
fig. 8 is a functional block diagram of a control end according to an embodiment of the present invention;
FIG. 9 is a diagram of a detection-side minimization system according to an embodiment of the present invention;
fig. 10 is a circuit diagram of a smoke control driving circuit of the detection terminal according to an embodiment of the present invention;
FIG. 11 is a circuit diagram of a light source driving circuit of an infrared light emitting tube at a detection end according to an embodiment of the present invention;
fig. 12 is a circuit diagram of a signal amplifying circuit at the detecting end according to an embodiment of the present invention;
fig. 13 is a control-side minimum system diagram according to an embodiment of the present invention;
FIG. 14 is a circuit diagram of a control-side liquid crystal interface according to an embodiment of the present invention;
fig. 15 is a circuit diagram of a control end 2.4G wireless communication interface according to an embodiment of the present invention;
fig. 16 is a circuit diagram of a control end key module according to an embodiment of the present invention;
fig. 17 is a 485 communication circuit diagram of the control terminal according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In one aspect, the present invention provides a quantitative detection device for a point-type smoke fire detector, as shown in fig. 1, comprising a detection end, a control end and a tripod;
the detection end is shown in fig. 2 and comprises a reflector panel 1, a smoke collecting hood 2, a smoke generation flue 3, a smoke adding fan 4, a smoke generation module 5, a detection light path cavity 6, a detection module 7, a two-way switch 8, a battery pack 9, an exhaust fan 10, a smoke generation module air chamber and a battery compartment; the reflector 1 is formed by die pressing of a high-precision hexagonal mold core, is arranged right above a detection light path cavity in the smoke collecting hood 2 and is used for reflecting infrared light to form a small-size light path; the detection light path cavity 6 is made of ferrous metal and is connected with the reflector 1 and the detection module 7 to detect the brightness attenuation condition of light rays in the closed cover; the smoke collecting hood 2 is formed by die pressing of a transparent acrylic material and is arranged above the smoke generating flue 3 and the detection light path cavity 6, and the quantitative detection device of the point type smoke fire detector is wrapped in the smoke collecting hood 2 to form a completely closed space; the detection module 7 is arranged right below the detection light path cavity 6 and is used for detecting the change of the attenuation value on the light path; the reflector 1 and the detection module 7 are both vertically arranged with the central line of the detection light path cavity 6; the smoke adding fan 4 is arranged right below the smoke generating flue 3 and is used for conveying smoke generated by the smoke generating module 5 after premixing to the smoke collecting hood 2 through the smoke generating flue 3; the smoke generating flue 3 is made of ferrous metal, and the smoke generating module 5 is arranged in an air chamber of the smoke generating module 5 below the smoke adding fan 4; the battery pack 9 is arranged in the battery bin, one side of the battery bin is connected with the smoke generating module, and the exhaust fan 10 is arranged below the detection module 7 and used for exhausting smoke in the detection end; the two-way switch 8 is arranged between the exhaust fan 10 and the detection module 7 and is used for controlling a circuit in the detection end detection module, the fuming module 5 and the battery pack 9;
the smoke generating module is composed of a liquid storage chamber, a smoke heating device and a fan, the fan is installed at the lower part of the liquid storage chamber, the smoke heating device is installed at the upper part of the liquid storage chamber, and the liquid storage chamber is connected with the smoke heating device through oil absorption cotton;
the detection module is composed of a biconvex lens, a background infrared LED (light emitting diode) 12, a detection infrared LED 16, an infrared receiving tube 13, a signal processing light source driving circuit board and a lens module 17 as shown in FIG. 3; the double-convex lens is arranged at the bottom of the cavity of the lens module 17, is parallel to the reflector 1, and comprises a first lens 11 and a second lens 18, wherein the first lens 11 is used for converging and detecting light rays of the light source of the infrared LED 12 reflected by the reflector 1 and focusing the light rays onto the infrared receiving tube 13, and the second lens 18 is used for converging and detecting infrared light emitted by the infrared LED; the lens module 17 is fixed on the surface of the signal processing light source driving circuit board; the signal processing light source driving circuit board is embedded with a signal processing circuit 14 for amplifying and processing photoelectric signals, and a photoelectric tube driving circuit 15, wherein the photoelectric tube driving circuit is respectively connected with the signal processing circuit 14 and the infrared receiving tube 13, and drives the photoelectric tube to emit light according to a control signal sent by the signal processing circuit 14; the background infrared LED luminous tube 12, the detection infrared LED luminous tube 16 and the infrared receiving tube 13 are welded on the surface of the signal processing light source driving circuit board; the infrared receiving tube 13 is arranged at the top of the cavity where the first lens 11 of the lens module is located; the detection infrared LED light-emitting tube 16 is arranged at the top of the cavity where the lens module second lens 18 is arranged; the axes of the background infrared LED light-emitting tube 12 and the infrared receiving tube 13 are parallel to the cavity of the lens module 17 and are vertical to the biconvex lens, and the light source emitted by the background infrared LED light-emitting tube 12 is directly received by the infrared receiving tube 13 so as to provide a background light source;
the control end is shown in fig. 4 and comprises a control end shell, a control end circuit board, a liquid crystal display 19, a buzzer 20, a control key 21, a portable hook 22, a hanging rope, a switch 23 and a charging hole 24, wherein the control end circuit board is arranged in the control end shell, and the liquid crystal display 19 is arranged on the control end circuit board and used for displaying detection data and software functions; the buzzer 20 and the control key 21 are welded on the control end circuit board; the liquid crystal display 19, the buzzer 20 and the control key are provided with corresponding holes on the control end shell; the switch 23 and the charging hole 24 are fixed on the surface of the control end shell; the portable hook 22 is fixed on the opposite side surface of the control end shell, and the hanging rope is connected to the hook 22;
the buzzer 20 outputs a prompt tone when the control end is in key operation and the battery power is low; the six keys of the control key 21 are upward, downward, quit, determine, stop and start respectively; the switch 23 is used for controlling the control between the control end circuit and the battery pack; the charging aperture 24 is used to control the end cell charging.
The tripod is composed of a connecting piece, a tripod and a supporting piece, wherein the connecting piece is connected with the detection end through a bayonet, the tripod is connected with the supporting piece through the bayonet and is used for fixing a supporting frame, the supporting frame is of a 5-section telescopic type, and two adjacent sections are fixedly connected through the bayonet;
on the other hand, the quantitative detection method of the point-type smoke fire detector is realized by the quantitative detection device of the point-type smoke fire detector, and comprises the following steps: the method comprises the following steps:
step 1: inputting smoke into the smoke and fire detection area by controlling the smoke generating device, and creating a simulated smoke environment in the detection area;
and 3, finishing detection when the quantitative detection device of the smoke-sensitive fire detector generates an alarm action, wherein the smoke concentration corresponding to the moment is the field test response threshold of the point-type smoke-sensitive fire detector.
The detection end circuit of the quantitative detection device of the point-type smoke-sensing fire detector consists of a light source driving module for generating a driving signal to control an infrared light-emitting tube, a smoke control module for controlling smoke quantity, a photoelectric conversion sampling module for collecting smoke concentration, a wireless communication module capable of carrying out data transmission and a main control module, wherein in the embodiment, the minimum system diagram of the detection end is shown in fig. 9, and the smoke driving control circuit comprises a first MOS tube T1, a second MOS tube T1_1, a third MOS tube T2 and a fourth MOS tube T2_ 1; wherein: the drain electrode of the first MOS pipe and the drain electrode of the second MOS pipe are respectively connected with the positive electrodes of the smoke adding fan and the exhaust fan, the drain electrode of the third MOS pipe and the drain electrode of the fourth MOS pipe are respectively connected with the heating wire of the smoke generating module and the positive electrode of the fan, and the grid electrodes of the four MOS pipes are connected with the smoke driving module. Smog control drive circuit adopts first MOS pipe T1 of PWM control mode control, the switch-on and the switch-off of third MOS pipe T2 and fourth MOS pipe T2_1, through the detection to smog concentration rate of rise, dynamic adjustment MOS pipe T2, T2_ 1's conduction time, the rotational speed of module play smoke volume and fan of control fuming, it is invariable to realize smog concentration rate of rise, after the detection, it is all opened with smoke fan and air discharge fan, carry out the washing of discharging fume in light path chamber, each MOS pipe all adopts model SI 2315.
The light source driving circuit is divided into a main transmitting tube D4 and a secondary transmitting tube D7 by selecting an infrared light emitting tube with a wide working temperature range and wavelength of 940nm, and is matched with a constant current source driving circuit built by the LM317, an analog switch 4066 and the realization of stable control of the working current of the light emitting tube.
In order to realize accurate detection of tiny light intensity attenuation, a current signal output by an infrared receiving S1 is amplified and converted into a voltage signal through a cross-group amplification design composed of U2C, R32 and C4, then the voltage signal is amplified through an integral operational amplifier part through gating of an analog switch 4066, and in actual operation, in order to eliminate variation of a photosensitive signal along with different ambient light intensities, a differential amplifier circuit composed of an INA326 and a peripheral circuit for removing ambient light is added in the signal amplifier circuit, so that the signal amplifier output end is not influenced by the ambient light intensities.
A complete optical path drive cycle consists of 8 phases:
in the stage (1), the 4 th path of the analog switch 4066 is conducted, the capacitor E13 corresponding to the main transmitting tube D4 is charged, the 4 th path of the analog switch 4066 is turned off, and the charging is completed.
In the stage (2), the 1 st path of the analog switch 4066 is conducted, the triode Q3 is conducted, the main transmitting tube discharges electricity corresponding to the capacitor E13, the main transmitting tube D4 emits infrared light beams, the 1 st path of the analog switch 4066 is disconnected, the triode Q3 is disconnected, and discharging is finished.
In the stage (3), the 3 rd path of the analog switch 4066 is conducted, the capacitor E14 corresponding to the transmitting tube D7 is charged, the 3 rd path of the analog switch is turned off, and the charging is completed.
In the stage (4), the 2 nd path of the analog switch 4066 is conducted, the triode Q7 is conducted, the capacitor E14 corresponding to the transmitting tube D7 discharges electricity, the infrared light beam is emitted from the transmitting tube D7, the 2 nd path of the analog switch 4066 is turned off, the triode Q7 is turned off, and discharging is completed.
In the stage (5), the 3 rd path of the analog switch 4066 is conducted, the capacitor E14 corresponding to the transmitting tube D7 is charged, the 3 rd path of the analog switch is turned off, and the charging is completed.
In the stage (6), the 2 nd path of the analog switch 4066 is conducted, the triode Q7 is conducted, the capacitor E14 corresponding to the transmitting tube D7 discharges electricity, the infrared light beam is emitted from the transmitting tube D7, the 2 nd path of the analog switch 4066 is turned off, the triode Q7 is turned off, and discharging is completed.
In the stage (7), the 4 th path of the analog switch 4066 is conducted, the capacitor E13 corresponding to the main transmitting tube D4 is charged, the 4 th path of the analog switch 4066 is turned off, and the charging is completed.
In the stage (8), the 1 st path of the analog switch 4066 is conducted, the triode Q3 is conducted, the main transmitting tube discharges electricity corresponding to the capacitor E13, the main transmitting tube D4 emits infrared light beams, the 1 st path of the analog switch 4066 is disconnected, the triode Q3 is disconnected, and discharging is finished. A complete optical path drive cycle is completed.
Further, as shown in fig. 7, the main control unit of the detection end includes an ARM chip STM32 having a plurality of interfaces, one end of the chip is connected to the driving module, and the other end of the chip is connected to the photoelectric conversion and sampling circuit, for driving the smoke adding device according to the sampling value, and for supporting the peripheral circuit of the ARM chip to work normally. The smoke control driving circuit at the detection end is shown in fig. 10, the infrared light emitting tube light source driving circuit at the detection end is shown in fig. 11, and the signal amplifying circuit at the detection end is shown in fig. 12.
The control end circuit of the quantitative detection device of the point type smoke fire detector is shown in figure 8 and comprises a main control module, a liquid crystal module, a wireless transmission module, a key module and a 485 communication module, wherein the minimum system diagram of the control end is shown in figure 13, the liquid crystal interface circuit of the control end is shown in figure 14, the 2.4G wireless communication interface circuit of the control end is shown in figure 15, the key module circuit is shown in figure 16, the 485 communication circuit of the control end is shown in figure 17,
the main control unit consists of an STM32 and a peripheral circuit supporting normal work of the STM32, and the key module and the liquid crystal module are used for performing man-machine interaction with the STM32 and used for issuing detection, stopping, cleaning and address reading commands and displaying smoke concentration values, battery voltage information and the like uploaded by a detection end. The 485 communication circuit adopts a 3485 chip and is used for communicating with software of an upper computer such as a computer.
The wireless communication of the detection end and the control end adopts a wireless serial port LC12S module to realize the data and command transmission of the control end and the detection section.
As shown in fig. 6, after detecting that the "start" key is pressed, the upper computer wirelessly downloads a "start detection command" to the lower computer, and the lower computer feeds back the "received start detection command" after receiving the command, starts initialization, and uploads a smoke value at an interval of 1s after the initialization is completed until the smoke value is stopped after receiving the "stop detection command".
If the upper computer continuously downloads the 'start detection command' for three times and does not receive the feedback of the lower computer, the 'command transmission failure' is displayed, after the feedback command of the lower computer is received, the timing per second is started and the accumulated time is displayed, and if the upper smoke value is received and the verification is correct, the received smoke value data is displayed on the liquid crystal screen.
If the upper computer detects that the stop key is pressed down, the stop detection command is transmitted to the lower computer in a wireless mode, the lower computer stops detection after receiving the stop detection command and feeds back the stop detection command, and the upper computer completes the detection after receiving the stop detection command.
As shown in fig. 5, after receiving the detection instruction from the upper computer, the lower computer starts to perform AD acquisition and conversion on the voltage output value of the photoelectric conversion differential sampling circuit, where the AD value represents the attenuation degree of smoke to light. If the AD value is too large, it means that the ambient light in the photoelectric conversion differential sampling circuit is not accurately offset, and the calibration during operation is required.
The calibration process during operation is as follows: and (3) finely adjusting the charging time of the charging capacitor E14, recording the AD value of the photoelectric conversion differential sampling circuit, and completing calibration in operation when the AD value is less than a certain amount (for example, less than 300 under the 12bit sampling width).
And after the calibration in operation is finished, acquiring the AD values of the first 3 s-10 s for averaging, and taking the average value as the light attenuation background value ADb in the smokeless state. And then, periodically collecting the AD value by taking 500-1000 ms as a period, taking the difference value between the AD value and ADb every time as the light attenuation amount ADt caused by smoke, simultaneously starting a smoke control driving circuit to drive a smoke generating module to generate the smoke, and starting a smoke adding fan to enable the smoke to start circulation. In the detection process, according to the ADt size and the rising rate, the average output voltage of the smoke control driving circuit is controlled in a segmented mode, the heating power of the smoke generation module is further controlled, the smoke generation amount is controlled, the average output voltage of the smoke control driving circuit is slightly reduced in the middle and later stages of smoke generation, and the smoke concentration ADt can be increased in a linear mode.
The relationship between the light attenuation ADt and the smoke concentration (dB/m) is realized by using an optical smoke density meter to calibrate in a standard smoke box, and the specific mode is as follows: the lower machine was placed in a standard smoke box, which was allowed to linearly rise smoke at a constant rate, with corresponding points between ADt and smoke concentration being calibrated every 0.05dB/m calibration interval. During detection, the smoke concentration value corresponding to the non-calibration point ADt is calculated in a linear interpolation mode.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (4)
1. The utility model provides a some type smoke detector quantitative determination device which characterized in that: the device comprises a detection end, a control end and a tripod;
the detection end comprises a reflector, a smoke collecting hood, a smoke generation flue, a smoke adding fan, a smoke generation module, a detection light path cavity, a detection module, a two-way switch, a battery pack, an exhaust fan, a smoke generation module air chamber and a battery cabin; the reflecting plate is formed by die pressing of a high-precision hexagonal mold core and is arranged right above the detection light path cavity in the smoke collecting hood; the detection light path cavity is made of ferrous metal and is connected with the reflector and the detection module; the smoke collecting hood is formed by die pressing of a transparent acrylic material and is arranged above the smoke generating flue and the detection light path cavity, and the quantitative detection device of the point type smoke fire detector is wrapped in the smoke collecting hood to form a completely closed space; the detection module is arranged right below the detection light path cavity, and the reflector and the detection module are both arranged perpendicular to the central line of the detection light path cavity; the smoke adding fan is arranged right below a smoke generating flue, the smoke generating flue is made of ferrous metal, and the smoke generating module is arranged in an air chamber of the smoke generating module below the smoke adding fan; the battery pack is arranged in the battery bin, one side of the battery bin is connected with the smoke generating module, the exhaust fan is arranged below the detection module, and the two-way switch is arranged between the exhaust fan and the detection module;
the control end comprises a control end shell, a control end circuit board, a liquid crystal display, a buzzer, a control key, a portable hook, a hanging rope, a switch and a charging hole, wherein the control end circuit board is installed in the control end shell, and the liquid crystal display is installed on the control end circuit board and used for displaying detection data and software functions; the buzzer and the control keys are welded on the control end circuit board, the buzzer operates on the control end keys, a prompt tone is output when the battery is in a low-power state, and six keys of the control keys are upward, downward, quit, determine, stop and start respectively; the liquid crystal display, the buzzer and the control key are provided with corresponding holes on the control end shell; the switch and the charging hole are fixed on the surface of the control end shell, and the switch is used for controlling the connection between the control end circuit and the battery pack; the charging hole is used for controlling the charging of the end battery; the portable hook is fixed on the opposite side surface of the control end shell, and the hanging rope is connected to the hook;
the tripod comprises connecting piece, tripod, support piece, the connecting piece passes through the bayonet socket and links to each other with the sense terminal, the tripod passes through the bayonet socket and links to each other with support piece for fixed support frame, the support frame is 5 sections telescopic, and adjacent two sections are through bayonet socket fixed connection.
2. The quantitative detection device of the point-type smoke-sensing fire detector as claimed in claim 1, wherein the smoke generating module comprises a liquid storage chamber, a smoke heating device and a fan, the fan is installed at the lower part of the liquid storage chamber, the smoke heating device is installed at the upper part of the liquid storage chamber, and the liquid storage chamber is connected with the smoke heating device through oil absorption cotton.
3. The quantitative detection device of the point-type smoke fire detector according to claim 1, wherein the detection module comprises a biconvex lens, a background infrared LED, a detection infrared LED, an infrared receiving tube, a signal processing light source driving circuit board and a lens module; the double-convex lens is arranged at the bottom of the lens module cavity, is parallel to the reflector and comprises a first lens and a second lens, the first lens is used for converging and detecting light rays of the infrared LED light-emitting tube light source reflected by the reflector and focusing the light rays onto the infrared receiving tube, and the second lens is used for converging and detecting infrared light emitted by the infrared LED light-emitting tube; the lens module is fixed on the surface of the signal processing light source driving circuit board; the signal processing light source driving circuit board is embedded with a signal processing circuit and a photoelectric tube driving circuit, the photoelectric tube driving circuit is respectively connected with the signal processing circuit and the infrared receiving tube, and the background infrared LED luminous tube, the detection infrared LED luminous tube and the infrared receiving tube are all welded on the surface of the signal processing light source driving circuit board; the infrared receiving tube is arranged at the top of the cavity where the first lens of the lens module is located; detecting that the infrared LED is arranged at the top of the cavity where the second lens of the lens module is located; the axes of the background infrared LED luminous tube and the infrared receiving tube are parallel to the cavity of the lens module and are vertical to the biconvex lens, and the light source emitted by the background infrared LED luminous tube is directly received by the infrared receiving tube.
4. A quantitative detection method for a point-type smoke fire detector, according to claim 1, comprising the steps of:
step 1: inputting smoke into the smoke and fire detection area by controlling the smoke generating device, and creating a simulated smoke environment in the detection area;
step 2, detecting the smoke concentration in the detection area through a detection end of a smoke-sensitive fire detector quantitative detection device and transmitting the detection result to a control end at any time;
and 3, finishing detection when the quantitative detection device of the smoke-sensitive fire detector generates an alarm action, wherein the smoke concentration corresponding to the moment is the field test response threshold of the point-type smoke-sensitive fire detector.
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