A quantitative detection device and method for point-type smoke fire detector

Abstract

The present invention provides a quantitative detection device and method for point-type smoke fire detectors, and relates to the technical field of smoke and fire detection. The device includes a detection end, a control end, and a tripod; the method improves the defects of traditional detection devices that cannot accurately judge the response degree of the fire alarm system to the fire signal on the scene, and cannot accurately and objectively evaluate the real protection degree that the detection system can achieve in the occasion, and has the advantages of easy operation, short measurement cycle, high accuracy, etc., and is easy to carry, simple to use and maintain, and stable and reliable performance.

Description

Technical Field

[0001] The present invention relates to the technical field of smoke and fire detection, and in particular to a quantitative detection device and method for a point-type smoke fire detector. Background Art

[0002] Point-type smoke detectors are the most common fire detectors currently used and are the main equipment in the automatic fire alarm system. The application environment conditions of point-type smoke detectors vary, and various interference conditions are complex. The comprehensive performance of its working reliability, stability of main parameters, etc., is the key factor that determines the performance of the entire automatic fire alarm system. At present, the engineering application of point-type smoke detectors has the following characteristics:

[0003] 1) With the continuous increase in new buildings, the number of newly installed point-type smoke detectors in my country is currently very large, reaching tens of millions;

[0004] 2) A large number of installed point-type smoke detectors have been contaminated for a long time or are approaching the end of their service life. Most of the detectors installed in projects since the 1980s have reached the limit of contamination due to different operating environments and are in urgent need of maintenance.

[0005] 3) The smoke source concentration of existing smoke detectors is uncontrollable and not environmentally friendly. At present, the smoke detectors used in the field of fire engineering detection in my country generally use stick incense, mosquito coils, etc. as smoke sources. Not only is the amount of smoke uncontrollable, but it also causes certain pollution to the detector itself and the environment.

[0006] 4) There is no on-site quantitative detection device for smoke detectors in China. At present, the smoke detectors used in the field of fire engineering detection in my country are all qualitative detection of the alarm function of the detector, and cannot quantitatively measure the response threshold of the detector.

[0007] The National Fire Alarm Code NFPA72 is the only universal fire alarm regulation in the United States. The regulation stipulates that all installed smoke detectors must be visually inspected six months after the initial acceptance test and annually functionally tested one year after the acceptance test. It must also be ensured that the sensitivity of each smoke detector is within its registered sensitivity range. If the detector sensitivity is found to be outside its registered sensitivity range, it must be cleaned, recalibrated or replaced.

[0008] my country has made a series of regulations on the on-site inspection of point-type smoke detectors in the following national standards and specifications:

[0009] (1) Article 6.2.1 of GA 588-2012 “Rules for On-site Determination of Fire Products” stipulates the inspection items, inspection methods and detection instruments for on-site inspection of point-type smoke detectors.

[0010] (2) Articles 4.3.1.1 and 5.3.1.1 of GA 503-2004 "Technical Code for Inspection of Building Fire Protection Facilities" stipulate that point-type smoke detectors should be able to perform alarm functions, fire alarm transmission functions, alarm confirmation light display functions, etc.

[0011] (3) Article 4.4.2 of GB 50166-2014 "Code for Construction and Acceptance of Automatic Fire Alarm Systems" stipulates the commissioning of point-type smoke fire detectors, and Articles 5.1.5 and 5.1.9 stipulate the on-site judgment and acceptance methods of point-type smoke fire detectors.

[0012] (4) Article 3.3.2 of GB 29837-2013 “Maintenance and Retirement of Fire Detection and Alarm Products” stipulates that after the smoke detector is repaired, a response threshold test should be conducted. Article 4.3.2 stipulates that the detector response threshold should be calibrated after cleaning.

[0013] The above national standards and specifications basically require point-type smoke detectors at the project site to have functions such as alarm and reset. The response threshold test specified in GB 29837-2013 is carried out in the laboratory. The response threshold is the most important performance indicator for the on-site application of point-type smoke detectors. It is directly related to the detector's response time to fire and the stable operation of the fire detection and alarm system.

[0014] Due to the limitations of current on-site detection technology, it is still impossible to accurately measure the response threshold of point-type smoke fire detectors at the project site in China. The current commonly used method of testing by burning cigarettes or smoke dispensers has the following prominent problems:

[0015] 1) The smoke sources of these devices are neither stable nor repeatable and reproducible, and the field test results are not consistent with the laboratory standard tests and are not comparable;

[0016] 2) The amount of smoke generated by burning cigarettes or smoke dispensers cannot be quantitatively controlled, and there is a lack of means to measure the smoke concentration on site, so it is impossible to make a quantitative judgment on whether the fire detector has achieved the corresponding fire detection response performance;

[0017] 3) The burning cigarette detection method is extremely labor-intensive and has low detection efficiency, resulting in a huge workload for system engineering debugging, acceptance, and maintenance.

[0018] The existence of the above problems directly leads to the inability to accurately judge the response degree of the fire alarm system to the fire signal at the scene, and the inability to accurately and objectively evaluate the real protection degree that the detection system can achieve in the situation. The method of sealing the detectors at the scene and sending them to a special testing agency for inspection lacks scientificity, rationality and operability. Summary of the invention

[0019] In view of the problems existing in the prior art, the present invention provides a quantitative detection device and method for a point-type smoke fire detector.

[0020] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0021] In one aspect, the present invention provides a quantitative detection device for a point-type smoke fire detector, comprising a detection end, a control end and a tripod;

[0022] The detection end includes a reflector, a smoke hood, a smoke duct, a smoke fan, a smoke module, a detection optical path cavity, a detection module, a two-way switch, a battery pack, an exhaust fan, a smoke module air chamber, and a battery compartment; the reflector is molded from a high-precision hexagonal mold core and is installed just above the detection optical path cavity in the smoke hood to reflect infrared light to form a small-sized optical path; the detection optical path cavity is made of black metal, connecting the reflector and the detection module to detect the brightness attenuation of light inside the closed hood; the smoke hood is molded from a transparent acrylic material and is arranged above the smoke duct and the detection optical path cavity to wrap the quantitative detection device of the point-type smoke fire detector in the smoke hood to form a completely enclosed space; the detection module The group is installed just below the detection optical path cavity, and is used to detect the change of attenuation value on the optical path; the reflector and the detection module are both installed perpendicular to the center line of the detection optical path cavity; the smoke-adding fan is installed just below the smoke duct, and is used to transport the smoke premixed by the smoke module to the smoke collecting hood through the smoke duct; the smoke duct is made of black metal, and the smoke module is arranged in the air chamber of the smoke module below the smoke-adding fan; the battery pack is arranged in the battery compartment, and one side of the battery compartment is connected to the smoke module, and the exhaust fan is arranged below the detection module, and is used to exhaust the smoke in the detection end; the two-way switch is arranged between the exhaust fan and the detection module, and is used for the control between the detection end circuit, the smoke module and the battery pack;

[0023] The smoke module is composed of a liquid storage chamber, a smoke heating device and a fan, wherein 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 to the smoke heating device through oil-absorbing cotton;

[0024] The detection module is composed of a double convex lens, a background infrared LED light-emitting tube, a detection infrared LED light-emitting tube, an infrared receiving tube, a signal processing light source driving circuit board, and a lens module; the double convex lens is installed at the bottom of the lens module cavity, parallel to the reflector, and includes a first lens and a second lens, the first lens is used to converge the light reflected by the detection infrared LED light source through the reflector and focus it on the infrared receiving tube, and the second lens is used to converge the infrared light emitted by the detection 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 to the signal processing circuit and the infrared receiving tube, the background infrared LED light-emitting tube, the detection infrared LED light-emitting 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; the detection infrared LED light-emitting tube 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 light-emitting tube and the infrared receiving tube are parallel to the lens module cavity and perpendicular to the double convex lens, and the light source emitted by the background infrared LED light-emitting tube is directly received by the infrared receiving tube.

[0025] The control end includes a control end housing, a control end circuit board, a liquid crystal display, a buzzer, a control button, a portable hook, a hanging rope, a switch, and a charging port. The control end circuit board is installed in the control end housing, and the liquid crystal display is installed on the control end circuit board for displaying detection data and software functions; the buzzer and the control button are welded on the control end circuit board; the liquid crystal display, the buzzer, and the control button have corresponding openings on the control end housing; the switch and the charging port are fixed on the surface of the control end housing; the portable hook is fixed on the opposite side of the control end housing, and the hanging rope is connected to the hook;

[0026] The buzzer is operated by a button at the control end, and outputs a prompt sound when the battery is low; the six control buttons are respectively up, down, exit, confirm, stop and start; the switch is used for controlling the control end circuit and the battery pack; the charging port is used for charging the battery at the control end.

[0027] The tripod is composed of a connecting piece, a tripod, and a supporting piece. The connecting piece is connected to the detection end through a bayonet, and the tripod is connected to the supporting piece through a bayonet, which is used to fix the supporting frame. The supporting frame is a 5-section telescopic type, and two adjacent sections are fixedly connected by a bayonet;

[0028] On the other hand, a quantitative detection method of a point-type smoke fire detector is implemented by the aforementioned quantitative detection device of a point-type smoke fire detector, comprising the following steps:

[0029] Step 1: Control the smoke generating device to input smoke into the fire and smoke detection area to create a simulated smoke environment in the detection area;

[0030] Step 2: The smoke concentration in the detection area is detected by the detection end of the smoke fire detector quantitative detection device and the detection result is transmitted to the control end in real time;

[0031] Step 3: When the quantitative detection device of the smoke fire detector generates an alarm action, the detection ends. The smoke concentration corresponding to this moment is the on-site test response threshold of the point-type smoke fire detector.

[0032] The beneficial effects of adopting the above technical solution are:

[0033] The present invention provides a quantitative detection device and method for point-type smoke fire detectors, which improve the defects of traditional detection devices that cannot accurately judge the response degree of the fire alarm system to the fire signal on site and cannot accurately and objectively evaluate the actual protection degree that the detection system can achieve in this situation. It has the advantages of easy operation, short measurement cycle, high accuracy, etc., and is easy to carry, simple to use and maintain, and has stable and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a quantitative detection device for a point-type smoke fire detector provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of a detection terminal provided in an embodiment of the present invention;

[0036] In the figure, 1-reflector, 2-smoke hood, 3-smoke duct, 4-smoke adding fan, 5-smoke module, 6-detection optical path cavity, 7-detection module, 8-dual-way switch, 9-battery pack, 10-exhaust fan;

[0037] Figure 3 A schematic diagram of a detection module provided in an embodiment of the present invention;

[0038] In the figure, 11-first lens, 12-background infrared LED light-emitting tube, 13-infrared receiving tube, 14-signal processing circuit, 15-photoelectric tube driving circuit, 16-detection infrared LED light-emitting tube, 17-lens module, 18-second lens;

[0039] Figure 4 A schematic diagram of a control terminal provided by an embodiment of the present invention;

[0040] In the figure, 19-LCD display, 20-buzzer, 21-control button, 22-portable hook, 23-switch, 24-charging port;

[0041] Figure 5A control flow chart of a lower computer provided in an embodiment of the present invention;

[0042] Figure 6 A control flow chart of a host computer provided in an embodiment of the present invention;

[0043] Figure 7 A block diagram of the detection end principle provided by an embodiment of the present invention;

[0044] Figure 8 A block diagram of the control terminal provided by an embodiment of the present invention;

[0045] Fig. 9 A minimum system diagram of a detection terminal provided by an embodiment of the present invention;

[0046] Fig.10 A smoke control driving circuit diagram of a detection end provided in an embodiment of the present invention;

[0047] Fig.11 A detection end infrared light emitting diode light source driving circuit diagram provided by an embodiment of the present invention;

[0048] Fig.12 A detection end signal amplification circuit diagram provided by an embodiment of the present invention;

[0049] Fig.13 A minimum system diagram of a control terminal provided by an embodiment of the present invention;

[0050] Fig.14 A control terminal liquid crystal interface circuit diagram provided by an embodiment of the present invention;

[0051] Fig.15 A circuit diagram of a 2.4G wireless communication interface of a control terminal provided by an embodiment of the present invention;

[0052] Fig.16 A circuit diagram of a control terminal key module provided by an embodiment of the present invention;

[0053] Fig.17 A communication circuit diagram of the control terminal 485 provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0055] On the one hand, the present invention provides a quantitative detection device for point-type smoke fire detectors, such as Figure 1 As shown, it includes a detection end, a control end and a tripod;

[0056] The detection end is as Figure 2As shown, it includes a reflector 1, a smoke hood 2, a smoke duct 3, a smoke fan 4, a smoke module 5, a detection optical path cavity 6, a detection module 7, a two-way switch 8, a battery pack 9, an exhaust fan 10, a smoke module air chamber, and a battery compartment; the reflector 1 is molded from a high-precision hexagonal mold core and is installed just above the detection optical path cavity in the smoke hood 2 to reflect infrared light to form a small-sized optical path; the detection optical path cavity 6 is made of black metal, connecting the reflector 1 and the detection module 7 to detect the brightness attenuation of light inside the closed hood; the smoke hood 2 is molded from a transparent acrylic material and is arranged above the smoke duct 3 and the detection optical path cavity 6 to wrap the quantitative detection device of the point-type smoke fire detector in the smoke hood 2 to form a completely enclosed space; the detection module 7 is installed in the The detection optical path cavity 6 is directly below the detection optical path cavity 6, and is used to detect the change of the attenuation value on the optical path; the reflector 1 and the detection module 7 are both installed perpendicular to the center line of the detection optical path cavity 6; the smoke adding fan 4 is installed directly below the smoke duct 3, and is used to transport the smoke premixed by the smoke module 5 to the smoke collecting hood 2 through the smoke duct 3; the smoke duct 3 is made of black metal, and the smoke module 5 is arranged in the air chamber of the smoke module 5 below the smoke adding fan 4; the battery pack 9 is arranged in the battery compartment, and one side of the battery compartment is connected to the smoke module, and the exhaust fan 10 is arranged below the detection module 7, and is used to exhaust the 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 the control between the circuit in the detection module at the detection end, the smoke module 5 and the battery pack 9;

[0057] The smoke module is composed of a liquid storage chamber, a smoke heating device and a fan, wherein 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 to the smoke heating device through oil-absorbing cotton;

[0058] The detection module is as follows Figure 3As shown, it is composed of a double convex lens, a background infrared LED light-emitting tube 12, a detection infrared LED light-emitting tube 16, an infrared receiving tube 13, a signal processing light source driving circuit board, and a lens module 17; the double convex lens is installed at the bottom of the cavity of the lens module 17, parallel to the reflector 1, and includes a first lens 11 and a second lens 18, the first lens 11 is used to converge the light reflected by the light source of the detection infrared LED light-emitting tube 12 through the reflector 1 and focus it on the infrared receiving tube 13, and the second lens 18 is used to converge the infrared light emitted by the detection infrared LED light-emitting tube; 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, which is used to amplify the photoelectric signal and the photoelectric tube driving circuit The circuit 15, the photoelectric tube driving circuit is connected to the signal processing circuit 14 and the infrared receiving tube 13 respectively, and drives the photoelectric tube to emit light according to the control signal sent by the signal processing circuit 14; the background infrared LED light-emitting tube 12, the detection infrared LED light-emitting tube 16 and the infrared receiving tube 13 are all 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 second lens 18 of the lens module is located; 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 perpendicular to the double convex lens, and the light emitted by the background infrared LED light-emitting tube 12 is directly received by the infrared receiving tube 13, thereby providing a background light source;

[0059] The control terminal is as follows Figure 4 As shown, it includes a control end housing, a control end circuit board, a liquid crystal display 19, a buzzer 20, a control button 21, a portable hook 22, a hanging rope, a switch 23, and a charging hole 24. The control end circuit board is installed in the control end housing, and the liquid crystal display 19 is installed on the control end circuit board for displaying detection data and software functions; the buzzer 20 and the control button 21 are welded on the control end circuit board; the liquid crystal display 19, the buzzer 20, and the control button have corresponding openings on the control end housing; the switch 23 and the charging hole 24 are fixed on the surface of the control end housing; the portable hook 22 is fixed on the opposite side of the control end housing, and the hanging rope is connected to the hook 22;

[0060] The buzzer 20 outputs a prompt sound when the battery is low when the control button is operated; the six buttons of the control button 21 are respectively up, down, exit, confirm, stop and start; the switch 23 is used for controlling the control circuit and the battery pack; the charging port 24 is used for charging the battery of the control end.

[0061] The tripod is composed of a connecting piece, a tripod, and a supporting piece. The connecting piece is connected to the detection end through a bayonet, and the tripod is connected to the supporting piece through a bayonet, which is used to fix the supporting frame. The supporting frame is a 5-section telescopic type, and two adjacent sections are fixedly connected by a bayonet;

[0062] On the other hand, a quantitative detection method of a point-type smoke fire detector is implemented by the aforementioned quantitative detection device of a point-type smoke fire detector, comprising the following steps:

[0063] Step 1: Control the smoke generating device to input smoke into the fire and smoke detection area to create a simulated smoke environment in the detection area;

[0064] Step 2: The smoke concentration in the detection area is detected by the detection end of the smoke fire detector quantitative detection device and the detection result is transmitted to the control end in real time;

[0065] Step 3: When the quantitative detection device of the smoke fire detector generates an alarm action, the detection ends. The smoke concentration corresponding to this moment is the on-site test response threshold of the point-type smoke fire detector.

[0066] The detection end circuit of the quantitative detection device of the point-type smoke fire detector is composed of a light source driving module that generates a driving signal to control the infrared light-emitting tube, a smoke control module that controls the amount of smoke, a photoelectric conversion sampling module that collects smoke concentration, a wireless communication module capable of data transmission, and a main control module. The minimum system diagram of the detection end in this embodiment is shown in FIG. Fig. 9 As shown, the smoke drive control circuit includes 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 drains of the first MOS tube and the second MOS tube are respectively connected to the positive electrodes of the smoke adding fan and the exhaust fan, the drains of the third MOS tube and the fourth MOS tube are respectively connected to the heating wire of the smoke module and the positive electrode of the fan, and the gates of the four MOS tubes are connected to the smoke driving module. The smoke control driving circuit uses PWM control to control the on and off of the first MOS tube T1, the third MOS tube T2, and the fourth MOS tube T2_1. By detecting the rising rate of smoke concentration, the on time of MOS tubes T2 and T2_1 is dynamically adjusted to control the smoke output of the smoke module and the speed of the fan, so as to achieve a constant rising rate of smoke concentration. After the detection, the smoke adding fan and the exhaust fan are fully turned on to perform smoke exhaust cleaning of the optical path cavity. Each MOS tube adopts model SI2315.

[0067] The light source driving circuit uses an infrared light-emitting tube with a wavelength of 940nm in a wide operating temperature range, which is divided into a main transmitting tube D4 and a slave transmitting tube D7, and cooperates with a constant current source driving circuit built by LM317 and an analog switch 4066 to achieve stable control of the working current of the light-emitting tube.

[0068] Photoelectric conversion sampling circuit, in order to achieve accurate detection of tiny light intensity attenuation, the amplifier circuit first uses a cross-group amplifier design composed of U2C, R32, and C4 to amplify the current signal output by the infrared receiver S1 into a voltage signal, and then amplifies it through the integration amplifier part through the selection of the analog switch 4066. In actual operation, in order to eliminate the changes in the photosensitive signal caused by the different ambient light intensity, a differential amplifier circuit composed of INA326 and peripheral circuits that removes ambient light is also added to the signal amplifier circuit, so that the signal amplification output end is not affected by the ambient light intensity.

[0069] A complete optical path driving cycle includes 8 stages:

[0070] In stage (1), the fourth path of the analog switch 4066 is turned on, the capacitor E13 corresponding to the main transmitting tube D4 is charged, and the fourth path of the analog switch 4066 is turned off, and the charging is completed.

[0071] In stage (2), the first path of analog switch 4066 is turned on, transistor Q3 is turned on, the capacitor E13 corresponding to the main transmitting tube is discharged, the main transmitting tube D4 emits an infrared beam, the first path of analog switch 4066 is turned off, transistor Q3 is turned off, and the discharge ends.

[0072] In stage (3), the third path of analog switch 4066 is turned on, and the capacitor E14 corresponding to the transmitting tube D7 is charged. The third path of analog switch 4066 is turned off, and the charging is completed.

[0073] In stage (4), the second path of analog switch 4066 is turned on, transistor Q7 is turned on, capacitor E14 corresponding to emitting tube D7 is discharged, and an infrared beam is emitted from emitting tube D7. The second path of analog switch 4066 is turned off, transistor Q7 is turned off, and the discharge is completed.

[0074] In stage (5), the third path of the analog switch 4066 is turned on, and the capacitor E14 corresponding to the transmitting tube D7 is charged. The third path of the analog switch is turned off, and the charging is completed.

[0075] In stage (6), the second path of analog switch 4066 is turned on, transistor Q7 is turned on, capacitor E14 corresponding to emitting tube D7 is discharged, and an infrared beam is emitted from emitting tube D7. The second path of analog switch 4066 is turned off, transistor Q7 is turned off, and the discharge is completed.

[0076] In stage (7), the fourth path of the analog switch 4066 is turned on, the capacitor E13 corresponding to the main transmitting tube D4 is charged, and the fourth path of the analog switch 4066 is turned off, and the charging is completed.

[0077] In stage (8), the first path of the analog switch 4066 is turned on, the transistor Q3 is turned on, the capacitor E13 corresponding to the main transmitting tube is discharged, the main transmitting tube D4 emits an infrared beam, the first path of the analog switch 4066 is turned off, the transistor Q3 is turned off, and the discharge ends. A complete optical path driving cycle is completed.

[0078] Further, such as Figure 7 The detection end main control unit shown in the figure has an ARM chip STM32 with multiple interfaces. One end of the chip is connected to the driver module, and the other end is connected to the photoelectric conversion and sampling circuit, which is used to drive the smoke adding device according to the sampling value, as well as the peripheral circuits used to support the normal operation of the ARM chip. The detection end smoke control drive circuit is as follows Fig.10 As shown in the figure, the infrared light source driving circuit of the detection end is as follows Fig.11 As shown, the detection end signal amplification circuit is as follows Fig.12 shown.

[0079] Point-type smoke fire detector quantitative detection device control end circuit Figure 8 As shown, it consists of a main control module, a liquid crystal module, a wireless transmission module, a key module, and a 485 communication module. The minimum system diagram of the control end is shown in Fig.13 As shown, the control end LCD interface circuit is as follows Fig.14 As shown, the control end 2.4G wireless communication interface circuit is as follows Fig.15 As shown, the key module circuit is as follows Fig.16 As shown, the control terminal 485 communication circuit is as follows Fig.17 As shown,

[0080] The main control unit is composed of STM32 and peripheral circuits that support its normal operation. The key module and LCD module are used for human-computer interaction with STM32, for issuing detection, stop, cleaning, and address reading commands, and for displaying the smoke concentration value and battery voltage information uploaded by the detection end. The 485 communication circuit uses a 3485 chip for communication with a computer or other host computer software.

[0081] The wireless communication between the detection end and the control end uses the wireless serial port LC12S module to realize the data and command transmission between the control end and the detection end.

[0082] like Figure 6 As shown, after the upper computer detects that the "start" button is pressed, it transmits the "start detection command" to the lower computer wirelessly. After receiving it, the lower computer feedbacks "received the start detection command" and starts initialization. After the initialization is completed, the smoke value is uploaded at an interval of 1s until it receives the "stop detection command" and stops.

[0083] If the upper computer transmits the "start detection command" three times in a row and does not receive feedback from the lower computer, it will display "Command sending failed". After receiving the feedback command from the lower computer, it will start timing every second and display the accumulated time. If the uploaded smoke value is received and verified to be correct, the received smoke value data will be displayed on the LCD screen.

[0084] If the upper computer detects that the "stop" button is pressed, it will transmit the "stop detection command" to the lower computer via wireless. After receiving it, the lower computer will stop the detection and feedback "received the stop detection command". After receiving it, the upper computer will complete the detection.

[0085] like Figure 5 As shown in the figure, after receiving the detection instruction from the upper computer, the lower computer starts to perform AD acquisition conversion on the voltage output value of the photoelectric conversion differential sampling circuit. The AD value represents the degree of attenuation of light by smoke. If the AD value is too large, it means that the photoelectric conversion differential sampling circuit does not accurately offset the ambient light, and runtime calibration is required.

[0086] The runtime calibration process is: fine-tuning the charging time of the charging capacitor E14, while recording the AD value of the photoelectric conversion differential sampling circuit. When the AD value is less than a certain amount (such as less than 300 at a 12-bit sampling width), the runtime calibration is completed.

[0087] After the calibration is completed during operation, the AD values ​​of the first 3s to 10s are collected and averaged, and this average value is used as the background value ADb of the light attenuation in the smoke-free state. After that, the AD value is periodically collected with a period of 500ms to 1000ms, and the difference between each AD value and ADb is used as the light attenuation ADt caused by smoke. At the same time, the smoke control drive circuit is started to drive the smoke module to generate smoke, and the smoke adding fan is started to circulate the smoke. During the detection process, according to the size of ADt and the rate of increase, the average output voltage of the smoke control drive circuit is controlled in sections, and then the heating power of the smoke module is controlled to control the amount of smoke. The average output voltage of the smoke control drive circuit is slightly reduced in the middle and late stages of smoke generation, which can keep the smoke concentration ADt growing linearly.

[0088] The relationship between light attenuation ADt and smoke density (dB / m) is achieved by calibrating the optical smoke density meter in a standard smoke box. The specific method is: place the lower computer in the standard smoke box, make the smoke box rise linearly at a constant rate, and calibrate the corresponding points between ADt and smoke density at every 0.05dB / m calibration interval. During detection, the smoke density value corresponding to the non-calibrated point ADt is calculated by linear interpolation.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A quantitative detection device for point-type smoke fire detectors, characterized in that: Including detection end, control end and tripod; The detection end includes a reflector, a smoke hood, a smoke duct, a smoke fan, a smoke module, a detection optical path cavity, a detection module, a two-way switch, a battery pack, an exhaust fan, a smoke module air chamber, and a battery compartment; the reflector is molded from a high-precision hexagonal mold core and is installed directly above the detection optical path cavity in the smoke hood; the detection optical path cavity is made of black metal and connects the reflector and the detection module; the smoke hood is molded from a transparent acrylic material and is arranged above the smoke duct and the detection optical path cavity, encapsulating the quantitative detection device of the point-type smoke fire detector Wrapped in the smoke hood to form a completely enclosed space; the detection module is installed directly below the detection light path cavity, and the reflector and the detection module are both installed vertically to the center line of the detection light path cavity; the smoke adding fan is installed directly below the smoke duct, the smoke duct is made of black metal, and the smoke module is arranged in the air chamber of the smoke module below the smoke adding fan; the battery pack is arranged in the battery compartment, one side of the battery compartment is connected to the smoke 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 includes a control end housing, a control end circuit board, a liquid crystal display, a buzzer, a control button, a portable hook, a lanyard, a switch, and a charging port. The control end circuit board is installed in the control end housing, and the liquid crystal display is installed on the control end circuit board to display detection data and software functions; the buzzer and the control button are welded on the control end circuit board. The buzzer is operated by the control end button, and a prompt sound is output when the battery is low. The six control buttons are up, down, exit, confirm, stop and start respectively; the liquid crystal display, the buzzer, and the control button are all provided with corresponding openings on the control end housing; the switch and the charging port are fixed on the surface of the control end housing, and the switch is used for controlling between the control end circuit and the battery pack; the charging port is used for charging the control end battery; the portable hook is fixed at the opposite side of the control end housing, and the lanyard is connected to the hook; The tripod is composed of a connecting piece, a tripod, and a supporting piece. The connecting piece is connected to the detection end through a bayonet, and the tripod is connected to the supporting piece through a bayonet, which is used to fix the supporting frame. The supporting frame is a 5-section telescopic type, and two adjacent sections are fixedly connected by a bayonet.

2. A point-type smoke fire detector quantitative detection device according to claim 1, characterized in that: 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 to the smoke heating device through oil-absorbing cotton.

3. A quantitative detection device for point-type smoke fire detectors according to claim 1, characterized in that: The detection module is composed of a double convex lens, a background infrared LED light-emitting tube, a detection infrared LED light-emitting tube, an infrared receiving tube, a signal processing light source driving circuit board, and a lens module; the double convex lens is installed at the bottom of the lens module cavity, parallel to the reflector, and includes a first lens and a second lens, the first lens is used to converge the light reflected by the detection infrared LED light source through the reflector and focus it on the infrared receiving tube, and the second lens is used to converge the infrared light emitted by the detection 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 to the signal processing circuit and the infrared receiving tube, the background infrared LED light-emitting tube, the detection infrared LED light-emitting 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; the detection infrared LED light-emitting tube 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 light-emitting tube and the infrared receiving tube are parallel to the lens module cavity and perpendicular to the double convex lens, and the light source emitted by the background infrared LED light-emitting tube is directly received by the infrared receiving tube.

4. A quantitative detection method for point-type smoke fire detectors, using a quantitative detection device for point-type smoke fire detectors as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Control the smoke generating device to input smoke into the fire and smoke detection area to create a simulated smoke environment in the detection area; Step 2: The smoke concentration in the detection area is detected by the detection end of the smoke fire detector quantitative detection device and the detection result is transmitted to the control end in real time; Step 3: When the quantitative detection device of the smoke fire detector generates an alarm action, the detection ends. The smoke concentration corresponding to this moment is the on-site test response threshold of the point-type smoke fire detector.

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