CN212693068U - Double-infrared flame detector for mine gas ventilation pipeline - Google Patents
Double-infrared flame detector for mine gas ventilation pipeline Download PDFInfo
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- CN212693068U CN212693068U CN202021251593.6U CN202021251593U CN212693068U CN 212693068 U CN212693068 U CN 212693068U CN 202021251593 U CN202021251593 U CN 202021251593U CN 212693068 U CN212693068 U CN 212693068U
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Abstract
The utility model discloses a two infrared flame detectors for mine gas air pipe, high SNR pyroelectric detection element and high SNR photoelectric sensor all are connected with 16 MCU treater through infrared signal preamplifier circuit and infrared signal filtering amplifier circuit, 16 MCU treater is simultaneouslyConnected with a pyroelectric detecting element with high signal-to-noise ratio and a photoelectric sensor with high signal-to-noise ratio through an infrared calibration circuit, wherein the pyroelectric detecting element with high signal-to-noise ratio and the photoelectric sensor with high signal-to-noise ratio are connected with a CaF2And optical filters are arranged between the windows. The utility model discloses in, through the detection to 0.9um and 4.3um wave band radiation peak value, realized the quick accurate judgement to flame to whole solid device that adopts has got rid of ultraviolet photosensitive tube and required high voltage power supply processing circuit, has reduced the volume, has promoted the security of detector, has prolonged the life of detector, has improved mining gas pipeline fire extinguishing explosion-proof system's work efficiency, is worth wideling popularize.
Description
Technical Field
The utility model relates to a mine gas air pipe protective apparatus field especially relates to a two infrared flame detectors for mine gas air pipe.
Background
Most of flame detectors of mine gas ventilation pipelines commonly applied at the present stage are ultraviolet and infrared dual-band detectors.
The flame detector uses the ultraviolet photosensitive tube to detect the ultraviolet spectrum of flame, the detection mode is feasible, but the ultraviolet photosensitive tube can normally work under the condition of voltage higher than 300V, the underground safety is not facilitated, meanwhile, the ultraviolet photosensitive tube belongs to a vacuum device, the service life is short, the detector needs to be replaced after being installed and used for one year, and the cost control is not facilitated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a double-infrared flame detector for a mine gas ventilation pipeline.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a two infrared flame detectors for mine gas air pipe, includes power source, power source passes through power conversion circuit and high SNR pyroelectric detection element and high SNR photoelectric sensor is connected, high SNR pyroelectric detection element and high SNR photoelectric sensor all are connected with 16 MCU treater through infrared signal preamplifier circuit and infrared signal filtering amplifier circuit, 16 MCU treater is connected with high SNR pyroelectric detection element and high SNR photoelectric sensor through outer red calibration circuit simultaneously, be provided with the AD converting circuit corresponding with infrared signal filtering amplifier circuit in the 16 MCU treater, 16 MCU treater is connected with output interface simultaneously, high SNR pyroelectric detection element and high SNR photoelectric sensor front end in the detector are provided with CaF2Window, high signal-to-noise ratio pyroelectric detecting element, high signal-to-noise ratio photoelectric sensor and CaF2Light filtering is arranged between the windowsAnd (3) slicing.
As a further description of the above technical solution:
the power conversion mode of the power conversion circuit adopts switching power conversion and linear power conversion.
As a further description of the above technical solution:
the response wave band of the high signal-to-noise ratio photoelectric sensor is 0.9um, and the response wave band of the high signal-to-noise ratio pyroelectric detection element is 4.3 um.
As a further description of the above technical solution:
the high signal-to-noise ratio photoelectric sensor and CaF2The filter between the windows is a high-transmittance narrow-band filter of 0.9um, and the high signal-to-noise ratio pyroelectric detecting element and CaF2The filter between the windows is a high-transmittance narrow-band filter of 4.3 um.
As a further description of the above technical solution:
the output signals of the high signal-to-noise ratio photoelectric sensor and the high signal-to-noise ratio pyroelectric detecting element are weak millivolt signals.
As a further description of the above technical solution:
the output interface is a CAN bus communication interface.
As a further description of the above technical solution:
the 16-bit MCU processor, the crystal oscillator, the program downloading debugging interface and the processor peripheral resistance-capacitance circuit form a core control unit processing circuit.
The utility model discloses following beneficial effect has:
the utility model discloses in, through the detection to 0.9um and 4.3um wave band radiation peak value, realized the quick accurate judgement to flame, and all adopt solid device, ultraviolet photosensitive tube and required high voltage power supply processing circuit have been got rid of, the volume has been reduced, the security of detector has been promoted, the life of detector has been prolonged, the work efficiency of mining gas pipeline fire-extinguishing explosion-proof system has been improved, and CAN set up relevant parameter in a flexible way through CAN bus communication interface, in order to satisfy different operation requirements, be worth wideling popularize.
Drawings
Fig. 1 is a schematic block diagram of a dual infrared flame detector for a mine gas ventilation duct according to the present invention;
fig. 2 is a power conversion circuit of a dual infrared flame detector for a mine gas ventilation duct provided by the utility model;
fig. 3 is an amplifying circuit of a dual infrared flame detector for a mine gas ventilation duct provided by the utility model;
fig. 4 is a core control unit processing circuit of a dual infrared flame detector for a mine gas ventilation pipeline provided by the utility model;
fig. 5 is a CAN bus application circuit of a dual infrared flame detector for a mine gas ventilation duct according to the present invention;
fig. 6 is a flow chart of the work of the dual infrared flame detector for the mine gas ventilation duct.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-6, the present invention provides an embodiment: a double infrared flame detector for mine gas ventilation pipeline comprises a power supply interface, wherein the main component of combustible gas in the mine gas ventilation pipeline is CH4Which, after deflagration, generates light and releases CO2Because the flame detector is installed in inclosed mine gas pipeline, the environment is dark, so the utility model discloses the detector selects 0.9um near infrared spectrum to survey and CO2The absorption wave of 4.3um is used as a detection wave band, a flame radiation peak value is extracted to the maximum, a flame signal can be taken out quickly and accurately, two paths of detection signal phases are 'AND' used as a fire alarm signal, the accurate and reliable detection of the flame is realized, a power interface is connected with a high signal-to-noise ratio pyroelectric detection element and a high signal-to-noise ratio photoelectric sensor through a power conversion circuit, the high signal-to-noise ratio pyroelectric detection element and the high signal-to-noise ratio photoelectric sensor are both connected with a 16-bit MCU processor through an infrared signal pre-amplification circuit and an infrared signal filtering amplification circuit, the amplification circuit carries out following and amplification processing on the infrared signal, an operational amplifier adopts AD8552 produced by AD company, a 1uF capacitor is connected in series between each stage of filtering amplification circuit, the circuit can more visually reflect the characteristics of the intensity, the frequency and the like of the flame, the 16-bit MCU processor is connected with the high signal-to noise ratio pyroelectric detection element, an A/D conversion circuit corresponding to the infrared signal filtering and amplifying circuit is arranged in the 16-bit MCU processor, the 16-bit MCU processor is simultaneously connected with the output interface, and a high signal-to-noise ratio pyroelectric detection element and a high signal-to-noise ratio in the detectorThe front end of the photoelectric sensor is provided with CaF2Window, high signal-to-noise ratio pyroelectric detecting element, high signal-to-noise ratio photoelectric sensor and CaF2All be provided with the light filter between the window, 16 bit MCU treater powerful, the interface is abundant, the arithmetic speed is fast, for the rapidity of fire judgement analysis, the accuracy provides the guarantee, the detector has realized comparatively accurate fire data curve simulation and complicated fire discernment judgement algorithm, through two way infrared signal voltage value analysis processes to gathering, save a large amount of fire information experimental data in the treater, carry out software filtering to the spectral information who gathers, carry out relevant calculation and data comparison again, whether the conflagration takes place is finally accurately judged, if the conflagration takes place, CAN export the fire alarm signal to output interface, and report relevant fire alarm state information through the CAN bus.
The power conversion mode of the power conversion circuit adopts switching power conversion and linear power conversion, the power conversion circuit comprises power input protection, power conversion and power filtering, the power input protection circuit mainly performs overcurrent protection, overvoltage protection, reverse connection prevention and the like on an external power supply, when the external power supply is in overvoltage, overcurrent and reverse connection, the internal circuit cannot be damaged, the safety is high, V4 plays a reverse connection prevention protection role, D2 converts the external input power into a +8V power and mainly supplies power to a pyroelectric detection element to work, D4 converts the external input power into a +5V system power to supply power to a processor, an integrated circuit and a system, a capacitor plays a filtering role, an inductor plays an isolating role, so that the power supply can realize wide voltage range input of external 9 VDC-18 VDC, the power loss is small, the efficiency is high, and the linear power conversion can provide a non-fluctuation, non-linear power conversion for the system, And an ideal system power supply is relatively stable.
The response waveband of the high signal-to-noise ratio photoelectric sensor is 0.9um, the response waveband of the high signal-to-noise ratio pyroelectric detecting element is 4.3um, and the high signal-to-noise ratio photoelectric sensor and the CaF2The filter between the windows is a high-transmittance narrow-band filter of 0.9um, a high signal-to-noise ratio pyroelectric detecting element and CaF2The optical filter between the windows is a high-transmittance narrow-band optical filter of 4.3um, so that signals of flame radiation can be maximally collected, and impurities are reducedProbability of wave interference.
The output signals of the high signal-to-noise ratio photoelectric sensor and the high signal-to-noise ratio pyroelectric detecting element are weak millivolt signals, because the output signal of the infrared photosensitive tube is millivolt-level weak signal, the output signal is difficult to be identified and distinguished by the 16-bit MCU and the processor, therefore, infrared signals need to be amplified without distortion for a processor to acquire in real time for fire identification and judgment, the conventional detectors in China generally adopt primary or secondary amplification for processing the infrared signals at present, the sensitivity is low, the dynamic property is poor, therefore, the four-stage amplifying circuit is adopted to amplify the infrared signals, the fire detection sensitivity is greatly improved, the dynamic property and the accuracy of fire identification are enhanced, and the two paths of collected infrared signals are sent to an A/D port in the 16-bit MCU processor to be converted into digital quantity after being subjected to pre-amplification and filtering amplification by the infrared processing circuit of the detector.
Output interface is CAN bus communication interface, CAN bus communication interface supports CAN2.0A and CAN2.0B agreement, the data rate supports and reaches up to 1Mbps, CAN bus transceiver is MAX3051, adopt the single power supply of low-voltage +3.3V, carry out surge impact protection to CAN bus interface through V28, terminal matched resistance R101 CAN decide whether to install according to the actual network deployment condition, remote monitoring terminal or host computer accessible CAN bus real-time supervision job site conditions, a series of problems such as the low cost of artifical inspection efficiency height have been avoided, furthermore, CAN set up relevant parameter in a flexible way through CAN bus communication interface, in order to satisfy different operation requirements.
The core control unit processing circuit is composed of a 16-bit MCU processor, a crystal oscillator, a program downloading and debugging interface and a processor peripheral resistance-capacitance circuit, and the model of the processor is MC9S12C128 CFA.
The working principle is as follows: the method comprises the steps of firstly carrying out overcurrent protection, overvoltage protection and reverse connection protection on an external power supply through a power supply conversion circuit, and providing a high signal-to-noise ratio photoelectric sensor, a high signal-to-noise ratio pyroelectric detection element and 16 power supply for an MCU processor, an integrated circuit and a system, then collecting signals through the high signal-to-noise ratio photoelectric sensor and the high signal-to-noise ratio pyroelectric detection element, analyzing and processing voltage values of two collected infrared signals through a 16-bit MCU processor, storing a large amount of fire information experiment data in the processor, carrying out software filtering on the collected spectrum information, then carrying out related calculation and data comparison, finally accurately judging whether a fire disaster occurs, outputting a fire alarm signal to an output interface if the fire disaster occurs, and reporting related fire alarm state information through a CAN bus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (7)
1. The utility model provides a two infrared flame detectors for mine gas air pipe, includes power source, its characterized in that: the power interface is connected with the high signal-to-noise ratio pyroelectric detecting element and the high signal-to-noise ratio photoelectric sensor through the power conversion circuit, the high signal-to-noise ratio pyroelectric detecting element and the high signal-to-noise ratio photoelectric sensor are connected with the 16-bit MCU processor through the infrared signal preamplifier circuit and the infrared signal filter amplifier circuit, the 16-bit MCU processor is connected with the high signal-to-noise ratio pyroelectric detecting element and the high signal-to-noise ratio photoelectric sensor through the infrared calibration circuit, the 16-bit MCU processor is internally provided with the A/D conversion circuit corresponding to the infrared signal filter amplifier circuit and is connected with the output interface, and the CaF is arranged at the front ends of the high signal-to-noise ratio pyroelectric detecting element and the high signal-to-noise ratio photoelectric sensor in the detector2Window, high signal-to-noise ratio pyroelectric detecting element, high signal-to-noise ratio photoelectric sensor and CaF2And optical filters are arranged between the windows.
2. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the power conversion mode of the power conversion circuit adopts switching power conversion and linear power conversion.
3. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the response wave band of the high signal-to-noise ratio photoelectric sensor is 0.9um, and the response wave band of the high signal-to-noise ratio pyroelectric detection element is 4.3 um.
4. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the high signal-to-noise ratio photoelectric sensor and CaF2The filter between the windows is a high-transmittance narrow-band filter of 0.9um, and the high signal-to-noise ratio pyroelectric detecting element and CaF2The filter between the windows is a high-transmittance narrow-band filter of 4.3 um.
5. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the output signals of the high signal-to-noise ratio photoelectric sensor and the high signal-to-noise ratio pyroelectric detecting element are weak millivolt signals.
6. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the output interface is a CAN bus communication interface.
7. A dual infrared flame detector for a mine gas ventilation duct according to claim 1, wherein: the 16-bit MCU processor, the crystal oscillator, the program downloading debugging interface and the processor peripheral resistance-capacitance circuit form a core control unit processing circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021251593.6U CN212693068U (en) | 2020-07-01 | 2020-07-01 | Double-infrared flame detector for mine gas ventilation pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021251593.6U CN212693068U (en) | 2020-07-01 | 2020-07-01 | Double-infrared flame detector for mine gas ventilation pipeline |
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| CN212693068U true CN212693068U (en) | 2021-03-12 |
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| CN202021251593.6U Expired - Fee Related CN212693068U (en) | 2020-07-01 | 2020-07-01 | Double-infrared flame detector for mine gas ventilation pipeline |
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