Multispectral adaptive flame detection circuit and device

Abstract

The utility model provides a scheme of a multispectral self-adaptive flame detection circuit and a multispectral self-adaptive flame detection device. An ultraviolet flame sensor, a visible light flame sensor and an infrared flame sensor are selected to automatically detect ultraviolet flame, visible flame and infrared flame respectively. By adopting the device, the effectiveness of detecting combustion flames of various random fuels on site by the flame detector can be further improved. The multi-spectral self-adaptive flame detection is truly realized, the core competitiveness of flame detection products can be further improved, and higher economic benefits and social benefits are created for enterprises.

Description

TECHNICAL FIELD

[0001] The utility model relates to flame detection technical field especially relates to a multispectral self -adaptation flame detection device. BACKGROUND

[0002] The flame detector produced by the domestic manufacturer at present mostly adopts single flame sensor, and its intensity adopts manual adjustment. When the on-site fuel changes, the on-site flame detection accuracy is reduced due to the change of its combustion characteristic, although its intensity can adopt manual adjustment, but the effect is not ideal, and even the actual flame cannot be measured finally. Even if the double flame sensor is adopted by part of the manufacturer, its intensity mostly adopts manual adjustment. This scheme increases the fire detection range to a certain extent, but the intensity cannot be automatically adjusted, when the on-site fuel changes randomly, the on-site flame detection needs cannot be well adapted. SUMMARY

[0003] In view of the defects in the prior art, the utility model provides a multispectral self -adaptation flame detection device. Specifically, three types of flame sensors of ultraviolet, visible light and infrared are selected to realize automatic detection of ultraviolet, visible light and infrared flame respectively. The device can further improve the effectiveness of the flame detector for on-site detection of various random fuel combustion flame. It comprises a power supply circuit, a microprocessor unit assembly, an ultraviolet sensor, a visible light sensor, an infrared sensor, a first signal processing circuit, a second signal processing circuit, a third signal processing circuit and a flame analog output circuit. The power supply circuit is used to power the multispectral self -adaptation flame detection circuit. The first signal processing circuit, the second signal processing circuit and the third signal processing circuit are used to process signals from the ultraviolet sensor, the visible light sensor and the infrared sensor respectively. The processed signals are transmitted to the microprocessor unit assembly. The microprocessor unit assembly is used to execute a flame detection program. The flame analog output circuit is used to output signals corresponding to the flame intensity.

[0004] On the basis of the above scheme, the first signal processing circuit inputs the ultraviolet sensor signal after signal amplification, filtering, frequency band setting and conversion to the microprocessor unit assembly channel 1. The second signal processing circuit inputs the visible light sensor signal after signal amplification, filtering, frequency band setting and conversion to the microprocessor unit assembly channel 2. The third signal processing circuit inputs the infrared sensor signal after signal amplification, filtering, frequency band setting and conversion to the microprocessor unit assembly channel 3.

[0005] Specifically, the flame detection program comprises system initialization, interrupt setting, channel analog-to-digital conversion, signal processing, switch output and analog output.

[0006] Specifically, the microprocessor unit assembly internally comprises program memory, data memory, data power failure protection memory, analog-to-digital conversion, digital-to-analog conversion, pulse width modulation output, software timer, asynchronous communication output function unit.

[0007] On the basis of the above scheme, a calendar, a clock circuit are included for recording system running cumulative time, system fault type and time parameters, providing a basis for system analysis.

[0008] On the basis of the above scheme, a watchdog circuit is included for monitoring system working voltage, software running condition, preventing system voltage from being too low and software running from being dead.

[0009] On the basis of the above scheme, a switch output circuit is included, including a flame switch output and a fault switch output; when the flame is effective, the flame switch output is effective; when the system self-checking appears a fault, the fault switch output is effective, prompting the user to find and solve the fault point.

[0010] On the basis of the above scheme, a system communication circuit is included for realizing data communication between the product and the upper computer or the hand controller.

[0011] On the basis of the above scheme, a keyboard input and display interface circuit is included for realizing man-machine interface; a digital tube is used for displaying system running data, and a light emitting diode is used for displaying system running state; a keyboard is used for system parameter setting.

[0012] Secondly, a multi-spectrum adaptive flame detection device is provided, which is installed with the multi-spectrum adaptive flame detection circuit in any of the above schemes, and further comprises an end cover, a shell, a panel, a circuit board assembly, an explosion-proof connector and an external connecting cable; the infrared sensor, the visible light sensor and the infrared sensor are arranged at the front end of the shell of the detection device; the panel is arranged on the end cover and is made of tempered glass and comprises a touch operation assembly and a display assembly; and the explosion-proof connector is used for connecting the external connecting cable.

[0013] The multi-spectrum adaptive flame detection device can further improve the core competitiveness of the flame detection product, and create higher economic and social benefits for enterprises.

[0014] The multi-spectrum adaptive flame detection device can further improve the core competitiveness of the flame detection product, and create higher economic and social benefits for enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model has the following drawings:

[0016] Figure 1 It is a flame detection principle block diagram of the utility model;

[0017] Figure 2The flame detection program block diagram of the utility model;

[0018] Figure 3 The device shell structure of the utility model;

[0019] Figure 4 The front of the device rear end cover of the utility model;

[0020] Figure 5 The device section view of the utility model.

[0021] Reference signs:

[0022] 1 rear end cover, 2 shell, 3 display panel, 4 explosion-proof connector, 5 external connection cable, 6 panel display area, 7 panel keyboard area, 8 hexagonal screw, 9 circuit board assembly, 10 flat head screw. DETAILED DESCRIPTION

[0023] The utility model is further explained in detail as follows. Figures 1-5 The utility model is further explained in detail as follows.

[0024] The flame detection circuit principle block diagram of a specific embodiment of the utility model is as shown in Figure 1 The power supply circuit provides DC12V and DC5V power supply. After ultraviolet sensor signal is amplified, filtered, frequency band is set and is converted, it is input to microprocessor unit assembly channel 1, it is mainly used to measure natural gas, coke oven gas, gas fuel combustion flame, visible light sensor signal is amplified, filtered, frequency band is set and is converted, and it is input to microprocessor unit assembly channel 2, it is mainly used to measure hydrogen, lanthanum carbon tail gas fuel combustion flame, infrared sensor signal is amplified, filtered, frequency band is set and is converted, and it is input to microprocessor unit assembly channel 3, it is mainly used to blast furnace gas, light oil, coal fuel combustion flame.

[0025] Microprocessor unit assembly inside includes program memory, data memory, data power failure protection memory, analog-digital conversion, digital-analog conversion, pulse width modulation output, software timer, asynchronous communication output and other functional units.

[0026] As shown in Figure 2 , the flame detection program is specifically:

[0027] S1: system initialization (electrically erasable data area self-checking; temporary data area self-checking; port input, output mode setting; timer 0, 1, 2, 3 mode setting; asynchronous communication port 0, 1 mode setting, baud rate setting; analog-digital conversion, digital-analog conversion mode setting; keyboard input format, display format setting, etc.)

[0028] S2: Interrupt level sorting; interrupt enable setting; start analog-to-digital conversion for channels 1, 2, and 3; digital tube and LED display; asynchronous communication service; keyboard input interrupt service routines; enable global interrupt;

[0029] S3: Analog-to-digital conversion ends, start system operation subroutine; (flame, fault) switch output program; (4~20) mA analog current output subroutine, etc.; interrupt allowed to restart.

[0030] Calendar and clock circuits are used to record parameters such as cumulative system operating time, system fault type and time, providing a basis for system analysis.

[0031] Watchdog circuits are used to monitor system operating voltage and software operation status to prevent system voltage from being too low and software from crashing.

[0032] The digital output circuit includes flame digital output and fault digital output. When the flame is active, the flame digital output is active (normally open / closed); when a system self-test fails, the fault digital output is active, prompting the user to locate and resolve the fault.

[0033] The flame analog output circuit is used to output a DC current of (4~20) mA corresponding to the flame intensity.

[0034] The system communication circuit is used to realize data communication between the product and the host computer or handheld device, enabling remote data monitoring.

[0035] The keyboard input and display interface circuit is used to implement the human-machine interface. The digital tube displays system operating data, and the LEDs display system operating status. The keyboard is used for system parameter settings.

[0036] An embodiment of the device of this utility model is as follows: Figures 3-5 As shown: 1 is the rear cover; 2 is the housing, inside which the circuit board assembly 9 is installed; 3 is the display panel, with a tempered glass surface; 4 is the explosion-proof connector, inside which a 12-core external connection cable 5 is installed.

[0037] like Figure 4 The image shows the front of the rear cover of this device. 6 is the panel display area, featuring an 8-digit digital tube display with an additional 3 LED status indicators below; 7 is the panel keypad area, with a 4-digit touch keypad; 8 are four hexagonal screws used to secure the rear cover 1 and the front housing 2. (See image for details.) Figure 5 The diagram shown is a cross-sectional view of the device, in which the circuit board assembly 9 is fixed inside the front cover 2 by two flame detectors 10.

[0038] The working process of the device is as follows: after the device is powered on, the keyboard is automatically locked, the "running" light is lit, and the device starts the channel 1, 2 and 3 analog-to-digital conversion according to the flame gain value, frequency band setting value and other parameters input by the keyboard, and then takes the conversion result as the basis for data operation. At the same time, the panel dynamically displays the flame intensity and the fire threshold value. When any channel flame is valid (flame intensity > fire threshold) and the duration exceeds the fire delay time, the "flame" light is lit, the flame relay output is valid (the normally open contact is closed), and the current output corresponds to the value (4mA-20mA DC). Only when all channel flames are invalid (flame intensity < fire threshold) and the duration exceeds the fire response time, the "flame" light is extinguished, the flame relay output is invalid, and the current output corresponds to the value (4mA-20mA DC).

[0039] The above embodiments are only used to illustrate the utility model patent, and are not limited to the utility model patent. Those skilled in the related art can make various changes and modifications without departing from the essence and scope of the utility model patent. Therefore, all equivalent technical solutions also belong to the scope of the utility model patent, and the patent protection scope of the utility model should be defined by the claims.

[0040] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A multi-spectral adaptive flame detection circuit, comprising: The power supply circuit, the microprocessor unit assembly, the ultraviolet sensor, the visible light sensor, the infrared sensor, the first signal processing circuit, the second signal processing circuit, the third signal processing circuit, and the flame analog output circuit are included. The power supply circuit is used to power the multi-spectrum adaptive flame detection circuit. The first signal processing circuit, the second signal processing circuit, and the third signal processing circuit are used to process signals from the ultraviolet sensor, the visible light sensor, and the infrared sensor, respectively, and transmit the processed signals to the microprocessor unit assembly. The microprocessor unit assembly is used to execute a flame detection program. The flame analog output circuit is used to output a signal corresponding to the intensity of the flame.

2. A multispectral adaptive flame detection circuit as claimed in claim 1, characterized in that, The first signal processing circuit inputs the ultraviolet sensor signal after signal amplification, filtering, frequency band setting, and conversion to the microprocessor unit assembly channel 1. The second signal processing circuit inputs the visible light sensor signal after signal amplification, filtering, frequency band setting, and conversion to the microprocessor unit assembly channel 2. The third signal processing circuit inputs the infrared sensor signal after signal amplification, filtering, frequency band setting, and conversion to the microprocessor unit assembly channel 3.

3. A multispectral adaptive flame detection circuit as claimed in claim 2, characterized in that, The flame detection program includes system initialization, interrupt setting, channel analog-to-digital conversion, signal processing, switch output, and analog output.

4. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, The microprocessor unit assembly internally includes program memory, data memory, data power failure protection memory, analog-to-digital conversion, digital-to-analog conversion, pulse width modulation output, software timer, and asynchronous communication output function units.

5. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, It also includes a calendar and clock circuit for recording system running cumulative time, system fault type, and time parameters.

6. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, It also includes a watchdog circuit for monitoring system operating voltage and software running status to prevent system voltage from being too low and software running from being dead.

7. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, It also includes a switch output circuit, specifically a flame switch output and a fault switch output; when the flame is effective, the flame switch output is effective; when the system self-test fails, the fault switch output is effective, prompting the user to find and solve the fault point.

8. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, It also includes a system communication circuit for realizing data communication between the product and the upper computer or hand controller.

9. A multispectral adaptive flame detection circuit as defined in claim 1, wherein, It also includes a keyboard input and display interface circuit for realizing human-computer interface; a digital tube for displaying system running data, a light-emitting diode for displaying system running status, and a keyboard for system parameter setting.

10. A multispectral adaptive flame detection device comprising a multispectral adaptive flame detection circuit according to any one of claims 1 to 9, characterized in that It also includes an end cover, a shell, a panel, a circuit board assembly, an explosion-proof connector, and an external connection cable; the infrared sensor, the visible light sensor, and the infrared sensor are arranged at the front end of the shell of the detection device; the panel is arranged on the end cover and is made of tempered glass and includes a touch operation assembly and a display assembly; and the explosion-proof connector is used to connect the external connection cable.

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