CN211741207U - Wireless gas detection system and wireless gas detector based on NB-IOT - Google Patents

Abstract

The utility model provides an NB-IOT-based wireless gas detection system and a wireless gas detector. The wireless gas detection system comprises: a power supply module; an MCU control module; a gas acquisition module; The concentration signal received by the control module is wirelessly transmitted to the cloud platform to facilitate data transmission with the communication terminal. The NB‑IOT wireless communication module is also used to transmit the alarm signal sent by the MCU control module when the received concentration signal exceeds the threshold to the cloud platform , so that the communication terminal can obtain the alarm signal. The wireless gas detection system of the utility model can directly upload the measured gas concentration to the cloud platform through the NB-IOT wireless communication method, without arranging long communication cables. At the same time, when the wireless gas detection system detects that the gas concentration exceeds the threshold, the relevant personnel can obtain the alarm signal at the first time and deal with it in time.

Description

Wireless gas detection system and wireless gas detector based on NB-IOT

technical field

The utility model relates to the technical field of gas detection, in particular to a wireless gas detection system based on NB-IOT (Narrow Band Internet of Things, Narrow Band Internet of Things) and a wireless gas detector having the wireless gas detection system.

Background technique

In the modern industrial production process, many gases that are toxic and harmful to the human body are produced, such as petroleum, chemical, pharmaceutical, metallurgy, paper and other industries. Toxic gases can exist both in production raw materials, such as most organic chemicals (VOCs), and in by-products at various stages of the production process, such as ammonia, carbon monoxide, hydrogen sulfide, and more. They are the most dangerous risk factors for workers. This kind of harm not only includes immediate injury, such as physical discomfort, morbidity, death, etc., but also includes long-term harm to the human body, such as disability, cancer and so on.

At present, most of the detectors used in industry are used in conjunction with a controller and a gas detector. Enterprises may install several industrial gas detectors in the factory area or areas that need to be detected as required, and install controllers corresponding to the detector types in the control area according to a certain proportion. When the gas detector detects the leaked gas, it transmits the alarm electrical signal to the controller through the bus cable, the controller sends out the corresponding sound and light alarm signal, and the relevant person in charge hears or sees the alarm signal and arrives at the gas leakage site to deal with the relevant affairs. .

However, the existing industrial gas detectors have many deficiencies and areas in need of improvement. E.g:

1. The traditional industrial gas detector needs to be matched with the corresponding controller to display the gas concentration in the detection area.

Since the detector needs to perform the corresponding sound and light alarm function, the traditional industrial detector needs a matching controller to receive monitoring data and information such as alarms and faults. However, the price of the general controller is relatively expensive, and a controller can only be equipped with a limited number of detectors, which results in the phenomenon that a gas detection area needs to be equipped with several control boxes, resulting in the cost of purchasing gas detector equipment for enterprises. huge.

2. Traditional industrial gas detectors need to arrange long communication cables.

Because the traditional gas detector needs to be used with the corresponding controller, and the controller is generally installed in a safe area or a control room, a long cable is required to transmit electrical signals between the gas detector and the controller. Arranging too long cables will not only increase the material cost of the enterprise, but also greatly increase the installation cost of the enterprise.

3. There is a problem that the alarm information of the traditional industrial gas detector cannot be notified to the relevant person in charge at the first time.

Because part of the traditional gas detector sound and light alarm function is in the controller, when there is no staff near the controller, it will cause the alarm situation not to be dealt with in the first time, which will increase the risk of related accidents, and even cause major safety incident.

4. Traditional industrial gas detectors need to be equipped with different detectors for different kinds of detected gases.

Traditional gas detectors usually can only test the gas concentration of one gas, which is not suitable for some changing gas environments.

5. The corresponding volume of traditional industrial gas detectors is relatively large, which is inconvenient for installation and use in relevant places. When the available space for the required installation area or the corresponding leakage location is insufficient, the large volume of the traditional gas detector will cause difficulties in installation and use.

Utility model content

One object of the present invention is to provide a wireless gas detection system capable of realizing the function of wireless data transmission, and the wireless gas detection system can notify the relevant person in charge of the alarm information at the first time.

A further object of the present invention is to provide a wireless gas detection system that can automatically identify a variety of gases, which is small in size and low in cost.

In particular, the present invention provides a wireless gas detection system based on NB-IOT, including:

a power module, used for providing the working voltage for the wireless gas detection system;

an MCU control module, connected to the power module, and the MCU control module is used to control and process data information in the wireless gas detection system;

a gas collection module, connected with the power supply module and the MCU control module, the gas collection module is used for collecting gas concentration and generating a corresponding concentration signal, and the MCU control module receives the concentration generated by the gas collection module Signal;

The NB-IOT wireless communication module is connected to the power supply module and the MCU control module, and the NB-IOT wireless communication module is used to wirelessly transmit the concentration signal received by the MCU control module to the cloud platform, so as to facilitate Carry out data transmission with the communication terminal, and the NB-IOT wireless communication module is also used to transmit the alarm signal sent by the MCU control module when receiving the concentration signal exceeding the threshold to the cloud platform, so as to facilitate the communication The terminal acquires the alarm signal.

Further, the power module has a DC/DC voltage conversion chip.

Further, the gas collection module is configured with a plurality of gas sensors, and the plurality of gas sensors are respectively configured with the same type of test circuits for detecting different types of gases.

Further, the wireless gas detection system also includes:

a current communication module, connected to the power supply module and the MCU control module, and the current communication module is used to convert the concentration signal received by the MCU control module into a current signal;

The peripheral drive circuit module is connected to the power supply module and the MCU control module, the peripheral drive circuit module is used to connect an acousto-optic alarm module, and the peripheral drive circuit module receives the signal converted by the current communication module into The current signal is transmitted to the sound and light alarm module, so that when the current signal exceeds a preset value, the sound and light alarm module is excited to issue an alarm message.

Further, the wireless gas detection system further includes: a display module connected to the power supply module and the MCU control module, and the display module is used to display data information and parameters in the wireless gas detection system.

Further, the display module is an LED digital tube.

Further, the wireless gas detection system further includes: a temperature monitoring module connected to the power supply module and the MCU control module, and the temperature monitoring module is used for monitoring the temperature of the wireless gas detection system.

Further, the temperature monitoring module is a thermistor.

The utility model also provides a wireless gas detector based on NB-IOT, comprising:

a detector housing, which defines a plurality of installation cavities, wherein one of the installation cavities is a sensor air cavity;

The wireless gas detection system based on NB-IOT as described in the above embodiments is arranged in the installation cavity, and the gas acquisition module is arranged in the sensor air cavity;

An explosion-proof casing is arranged on the detector casing to improve the explosion-proof performance of the wireless gas detector.

Further, the sensor air cavity has an air guide cover, and the air guide cover is a single-sided and viscous bubble guide foam.

The NB-IOT-based wireless gas detection system of the present invention has a built-in NB-IOT wireless communication module, which can directly upload the measured gas concentration to the cloud platform through the NB-IOT wireless communication method, without arranging long communication lines cable. At the same time, when the wireless gas detection system detects that the gas concentration exceeds the set threshold, it will send out a corresponding alarm signal and transmit the alarm signal to the cloud platform. The relevant personnel can obtain the alarm signal through the communication terminal, which is beneficial to the relevant personnel first. Time to obtain the alarm signal and deal with it in time.

Further, the NB-IOT-based wireless gas detection system of the present invention is matched with a variety of gas sensors, and can automatically identify the corresponding gas sensor according to the specific gas type, so as to detect the gas concentration, effectively expanding the gas concentration. Scope of application of wireless gas detection system.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic diagram of a wireless gas detection system according to an embodiment of the present invention;

2 is a circuit design diagram of a power module of a wireless gas detection system according to an embodiment of the present invention;

3 is another circuit design diagram of the power module of the wireless gas detection system according to an embodiment of the present invention;

4 is a circuit diagram of an MCU control module of a wireless gas detection system according to an embodiment of the present invention;

5 is a circuit design diagram of the NB-IOT wireless communication module of the wireless gas detection system according to an embodiment of the present invention;

6 is a driving circuit diagram of a methane gas sensor of a wireless gas detection system according to an embodiment of the present invention;

7 is a driving circuit diagram of an oxygen sensor of a wireless gas detection system according to an embodiment of the present invention;

8 is a drive circuit diagram of an electrochemical sensor of a wireless gas detection system according to an embodiment of the present invention;

9 is a circuit design diagram of a current communication module of a wireless gas detection system according to an embodiment of the present invention;

10 is another circuit design diagram of the current communication module of the wireless gas detection system according to the embodiment of the present invention;

11 is a circuit diagram of a peripheral drive circuit module of a wireless gas detection system according to an embodiment of the present invention;

12 is a circuit diagram of a display module of a wireless gas detection system according to an embodiment of the present invention;

13 is a circuit diagram of a temperature monitoring module of a wireless gas detection system according to an embodiment of the present invention;

14 is a circuit diagram of an infrared receiving module of a wireless gas detection system according to an embodiment of the present invention;

15 is a schematic structural diagram of a wireless gas detector according to an embodiment of the present invention;

16 is a side view of a wireless gas detector according to an embodiment of the present invention;

17 is a schematic structural diagram of an explosion-proof casing of a wireless gas detector according to an embodiment of the present invention;

18 is a schematic structural diagram of a sensor air cavity of a wireless gas detector according to an embodiment of the present invention.

Reference number:

Wireless gas detection system 100;

Power module 10;

MCU control module 20;

a gas collection module 30;

NB-IOT wireless communication module 40;

current communication module 50;

Peripheral drive circuit module 60; sound and light alarm module 61;

display module 70;

temperature monitoring module 80;

Wireless gas detector 200;

Detector housing 91; Explosion-proof plug 92; Explosion-proof stuffing box 93; PCB board 94; Power board assembly 95; Pressure ring 965; explosion-proof casing 97.

Detailed ways

1 , the NB-IOT-based wireless gas detection system 100 of the present invention is mainly composed of a power module 10 , an MCU control module 20 , a gas acquisition module 30 and an NB-IOT wireless communication module 40 . The power module 10 is used to provide a working voltage for the wireless gas detection system 100 , and the power module 10 can convert the industrial 24V industrial voltage into a 5V working voltage required by the wireless gas detection system 100 after filtering and step-down processing. The MCU control module 20 is connected to the power supply module 10 , and the MCU control module 20 is used for controlling and processing data information in the wireless gas detection system 100 . Specifically, the circuit diagram of the MCU control module 20 is shown in FIG. 4 . As the “brain” of the wireless gas detection system 100 , the MCU control module 20 is mainly used to process various data acquisition, issuance processing and output control in the wireless gas detection system 100 . and other functions.

The gas collection module 30 is connected to the power supply module 10 and the MCU control module 20 (MCU: Microcontroller Unit, micro control unit). The gas collection module 30 is used to collect gas concentration and generate a corresponding concentration signal, and the MCU control module 20 receives the gas collection module 30. Generated concentration signal. The NB-IOT wireless communication module 40 (Narrow Band Internet of Things, Narrow Band Internet of Things) is connected with the power supply module 10 and the MCU control module 20, and the NB-IOT wireless communication module 40 is used for wirelessly transmitting the concentration signal received by the MCU control module 20 to the cloud platform to facilitate data transmission with the communication terminal, and when the concentration signal received by the MCU control module 20 exceeds the threshold, the MCU control module 20 sends an alarm signal, and the NB-IOT wireless communication module 40 transmits the alarm signal to the cloud platform, so as to facilitate The communication terminal obtains the alarm signal. Specifically, through the built-in NB-IOT wireless communication module 40, the wireless gas detection system 100 of the present invention does not need to use an additional controller for communication connection. The gas concentration is uploaded to the cloud platform, which is convenient for data transmission with communication terminals (mobile phone, mobile phone APP, WeChat, etc.). When the wireless gas detection system 100 detects that the gas concentration exceeds the set alarm concentration (threshold), the wireless gas detection The system 100 will immediately upload the alarm signal to the gas detection platform (cloud platform), and at this time, the person in charge of the relevant binding will immediately receive the alarm information from the communication terminal, such as WeChat information or SMS information. If the corresponding alarm information has not been processed within a certain period of time, the relevant person in charge will also receive a call, indicating that there is a gas leak at the corresponding alarm location, which is conducive to the relevant personnel to obtain the alarm information at the first time. The circuit diagram of the NB-IOT wireless communication module 40 is shown in FIG. 5. The NB-IOT wireless communication module 40 is the core module of the wireless gas detection system 100. The NB-IOT wireless communication module 40 can directly use the communication frequency bands of the three major operators, so that the The wireless detection system has the characteristics of wide coverage and high signal strength. The NB-IOT wireless communication module 40 designed with this circuit supports the whole network communication frequency band, and the NB-IOT wireless communication module 40 has its own flow card for communication without considering the problem of the self-provided communication card. And the NB-IOT wireless communication module 40 has the function of low power consumption. The working current in idle mode is at least 0.5mA, and the working current in sleep state is at least 3uA. This low power consumption mode can effectively reduce wireless communication. Power consumption of the gas detection system 100 .

Therefore, the NB-IOT-based wireless gas detection system 100 of the present invention has a built-in NB-IOT wireless communication module 40, and can directly upload the measured gas concentration to the cloud platform through the NB-IOT wireless communication method, without the need for arrangement Long communication cables. At the same time, when the wireless gas detection system 100 detects that the gas concentration exceeds the set threshold, it will send out a corresponding alarm signal, and transmit the alarm signal to the cloud platform. The relevant personnel can obtain the alarm signal through the communication terminal, which is beneficial to the relevant personnel. Get the alarm signal at one time and deal with it in time.

According to an embodiment of the present invention, the power module 10 has a DC/DC (direct current to direct current conversion circuit) voltage conversion chip. Specifically, the power module 10 of the wireless gas detection system 100 may convert the industrial voltage of 24V into a required working voltage of 5V after filtering and step-down processing. The circuit design diagram of the power module 10 is shown in Figure 2 and Figure 3. The front end of the power module 10 has the functions of anti-lightning, anti-surge, and filtering input noise, which can effectively protect the power input line from external interference and maintain the input constant voltage stability. The middle part of the power module 10 uses a bridge as the main device for preventing reverse connection of the power supply. When the positive and negative poles of the power supply are reversed, the device can be used normally. Therefore, this part realizes the positive and reverse connection of the power supply of the wireless gas detector 200. Function. The back end of the power module 10 uses a DC/DC (direct current to direct current conversion circuit) voltage conversion chip, which has the most efficient conversion voltage and avoids excessive and useless power consumption.

According to an embodiment of the present invention, the gas collection module 30 is configured with a plurality of gas sensors, and the plurality of gas sensors are respectively configured with the same type of test circuits for detecting different types of gases. Specifically, the gas acquisition module 30 in the wireless gas detection system 100 can be matched with various gas sensors, such as a methane gas sensor, an oxygen gas sensor and an electrochemical sensor. By configuring multiple gas sensors with the same type of test circuit respectively, it has a multi-compatibility feature. The wireless gas detection system 100 can automatically identify the sensor type, and through its built-in sensor detection circuit, can detect the corresponding signal values of different sensors, such as electrochemical sensors, after replacing the sensor with a new gas type, the wireless gas detection system 100 The type of the detected gas can be automatically detected and identified, and gas monitoring can be performed after the wireless gas detection system 100 is set for corresponding mass production through the infrared controller. The driving circuit diagram of the methane gas sensor is shown in Figure 6. The methane gas sensor has the advantages of high gas response sensitivity, excellent linearity, stable operation and strong anti-interference. In the methane gas sensor, two operational amplifiers are used to form a subtractor, so that the The test voltage of the methane gas sensor is biased to the set voltage value, which can effectively prevent the abnormal test data caused by the sensor drift. The driving circuit diagram of the oxygen sensor is shown in Figure 7. The oxygen sensor has the characteristics of high precision, strong anti-interference, high repeatability and low drift. At the same time, an operational amplifier is used in the oxygen sensor to configure a proportional amplifier circuit to amplify the test signal of the sensor. The ADC input front end uses a Π-type filter circuit to filter out the noise signal. This design not only improves the test accuracy of the sensor, but also increases the exposure of the product to the outside world. anti-interference ability.

The driving circuit of the electrochemical sensor is shown in Figure 8. In the designed circuit, a JEFT tube and an operational amplifier are used at the R and S ports of the sensor to balance the level of the sensor to prevent the jitter of the port level from causing test errors. The drive circuit uses an amplifier whose open-loop amplification can reach about 160db. The amplifier can amplify tens of thousands of times the signal, and can effectively amplify the weak electrochemical signal without causing the problem of op amp offset. The drive circuit can also be adapted to carbon monoxide sensors, hydrogen sulfide sensors, hydrogen sensors, chlorine sensors, ammonia sensors, hydrogen chloride sensors, nitrogen monoxide sensors, ETO sensors, nitrogen dioxide sensors, hydrogen fluoride sensors, sulfur dioxide sensors and other gas sensors . When the above sensors are replaced on the wireless gas detector 200 of the present invention, there is no need to adjust hardware parameters, and the wireless gas detector 200 can be automatically adapted for gas monitoring, which can effectively avoid the trouble caused by configuring different detectors when testing different gases.

According to an embodiment of the present invention, the wireless gas detection system 100 further includes a current communication module 50 , a peripheral drive circuit module 60 , a display module 70 and a temperature monitoring module 80 . The current communication module 50 is connected to the power supply module 10 and the MCU control module 20 , and the current communication module 50 is used to convert the concentration signal received by the MCU control module 20 into a current signal. The circuit diagram of the current communication module 50 is shown in FIG. 9 and FIG. 10. The current communication module 50 is mainly used to convert the real-time gas concentration monitored by the wireless gas detection system 100 into a 4-20mA current signal, which can be compatible with traditional The controller sends a communication alarm. This part sends the corresponding DAC digital signal to the current conversion chip through the MCU control module 20 to convert the voltage signal into a current signal. The current signal has the functions of anti-fading and anti-interference, and can support traditional cable wiring of several kilometers.

The peripheral drive circuit module 60 is connected to the power supply module 10 and the MCU control module 20. The peripheral drive circuit module 60 is used to connect an external sound and light alarm module 61, a solenoid valve, etc. The current signal is transmitted to the sound and light alarm module 61, so that when the current signal exceeds the preset value, the sound and light alarm module 61 is excited to issue an alarm message. The sound and light alarm module 61 can use sound and light alarms. The circuit diagram of the peripheral drive circuit module 60 is shown in FIG. 11 . The relay in the drive circuit has a drive capability of 2A, and common external accessories can drive it to work normally.

The display module 70 is connected with the power supply module 10 and the MCU control module 20 , and the display module 70 is used for displaying data information and parameters in the wireless gas detection system 100 . The circuit diagram of the display module 70 is shown in FIG. 12. The display module 70 can use an LED digital tube. Preferably, the display module 70 can use a 4-digit eight-segment digital tube. The display module 70 not only displays the current gas concentration, but also can control the display through the infrared receiving module. Interface switching and adjustment of related parameters. The circuit diagram of the infrared receiving module is shown in Figure 14. The infrared receiving module can use an infrared receiver, and the display module 70 can display the alarm point, perform gas calibration, set the gas detection range, view the AD sampling value of the temperature monitoring module 80, and the gas acquisition module 30 ( Gas sensor) AD value, current output calibration and other operations.

The temperature monitoring module 80 is connected to the power module 10 and the MCU control module 20 , and the temperature monitoring module 80 is used for monitoring the temperature of the wireless gas detection system 100 . The temperature monitoring module 80 can use a thermistor. The circuit diagram of the temperature monitoring module 80 is shown in FIG. 13. The temperature monitoring module 80 collects the voltage dividing resistance through a series circuit, and the resistance value of the thermistor also changes with the change of temperature. The collected voltage divider resistance will also change accordingly. Through the back-end voltage follower, the input impedance of the ADC is increased, which improves the accuracy of data collection.

All in all, the NB-IOT-based wireless gas detection system 100 of the present invention has a built-in NB-IOT wireless communication module 40, and can directly upload the measured gas concentration to the cloud platform through the NB-IOT wireless communication method, without the need to arrange relatively long communication cables. At the same time, when the wireless gas detection system 100 detects that the gas concentration exceeds the set threshold, it will send out a corresponding alarm signal, and transmit the alarm signal to the cloud platform. The relevant personnel can obtain the alarm signal through the communication terminal, which is beneficial to the relevant personnel. Get the alarm signal at one time and deal with it in time. The NB-IOT-based wireless gas detection system 100 of the present invention is matched with a variety of gas sensors, and can automatically identify the corresponding gas sensor according to the specific gas type, so as to detect the gas concentration, effectively expanding the wireless gas Scope of application of the detection system 100 .

The present invention also provides a wireless gas detector 200 based on NB-IOT, which is mainly composed of a detector casing 91 , the wireless gas detection system 100 in the above embodiment, and an explosion-proof casing 97 . Referring to FIGS. 15 to 18 , the detector housing 91 is machined with a plurality of installation cavities, and one of the installation cavities is the sensor air cavity 96 . Referring to Figure 15, an explosion-proof stuffing box 93 and an explosion-proof plug 92 are installed on the detector housing 91. The explosion-proof plug 92 and the explosion-proof stuffing box 93 are machined with a threaded explosion-proof surface. The minimum engagement depth of the threaded explosion-proof surface is not less than 8mm. Effective The number of engaging buttons is not less than 5 buttons. The NB-IOT based wireless gas detection system 100 is installed in the installation cavity, and the gas acquisition module 30 is provided in the sensor air cavity 96 . Specifically, referring to FIG. 16 , a PCB board 94 corresponding to a module is arranged in each installation cavity, and each PCB board 94 corresponds to a module in the wireless gas detection system 100 . For example, the power module 10 is mounted on the corresponding power board assembly 95, the MCU control module 20 is mounted on the PCB board 94 of the MCU control circuit, and so on. Referring to FIG. 18 , the gas collection module 30 has a sensor air cavity 96 , the sensor air cavity 96 has an air guide cover 961 , and the air guide cover 961 adopts a single-sided and viscous bubble guide foam, which reduces the cost and reduces the sensor air cavity 96 volume of. Of course, the sensor cavity is also provided with structures such as a flame arrester 962, a sensor connector 964, a gas signal plate 963, a pressure ring 965, etc., which are understandable and achievable by those skilled in the art, and will not be described in this application. Describe in detail. Referring to FIG. 15 and FIG. 17 , the explosion-proof casing 97 is installed on the detector housing 91 , and the explosion-proof casing 97 can effectively improve the explosion-proof performance of the wireless gas detector 200 .

The NB-IOT-based wireless gas detector 200 of the present invention is small in size and easy to install, and by using the wireless gas detection system 100 in the above embodiment, the measured gas concentration can be directly uploaded through the NB-IOT wireless communication method To the cloud platform, there is no need to arrange long communication cables. At the same time, when the wireless gas detection system 100 detects that the gas concentration exceeds the set threshold, it will send out a corresponding alarm signal, and transmit the alarm signal to the cloud platform. The relevant personnel can obtain the alarm signal through the communication terminal, which is beneficial to the relevant personnel. Get the alarm signal at one time and deal with it in time. At the same time, the wireless gas detector 200 is matched with a variety of gas sensors, and the corresponding gas sensor can be automatically identified according to the specific gas type to detect the gas concentration, which effectively expands the application range of the wireless gas detection system 100 .

Other structures and operations of the wireless gas detector 200 according to the embodiment of the present invention can be understood and easily implemented by those skilled in the art, and therefore will not be described in detail.

By now, those skilled in the art will recognize that although various exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, Numerous other variations or modifications consistent with the principles of the present invention are directly identified or derived from the disclosure of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (9)

1. a wireless gas detection system based on NB-IOT, is characterized in that, comprises: a power module, used for providing the working voltage for the wireless gas detection system; an MCU control module, connected to the power module, and the MCU control module is used to control and process data information in the wireless gas detection system; a gas collection module, connected with the power supply module and the MCU control module, the gas collection module is used for collecting gas concentration and generating a corresponding concentration signal, and the MCU control module receives the concentration generated by the gas collection module signal; wherein, the gas acquisition module is configured with a plurality of gas sensors, and the plurality of gas sensors are respectively configured with the same type of test circuit for detecting different types of gas; The NB-IOT wireless communication module is connected to the power supply module and the MCU control module, and the NB-IOT wireless communication module is used to wirelessly transmit the concentration signal received by the MCU control module to the cloud platform, so as to facilitate Carry out data transmission with the communication terminal, and the NB-IOT wireless communication module is also used to transmit the alarm signal sent by the MCU control module when receiving the concentration signal exceeding the threshold to the cloud platform, so as to facilitate the communication The terminal acquires the alarm signal. 2 . The wireless gas detection system based on NB-IOT according to claim 1 , wherein the power module has a DC/DC voltage conversion chip. 3 . 3. The wireless gas detection system based on NB-IOT according to claim 1, wherein the wireless gas detection system further comprises: a current communication module, connected to the power supply module and the MCU control module, and the current communication module is used to convert the concentration signal received by the MCU control module into a current signal; The peripheral drive circuit module is connected to the power supply module and the MCU control module, the peripheral drive circuit module is used to connect an acousto-optic alarm module, and the peripheral drive circuit module receives the signal converted by the current communication module into The current signal is transmitted to the sound and light alarm module, so that when the current signal exceeds a preset value, the sound and light alarm module is excited to issue an alarm message. 4. The NB-IOT-based wireless gas detection system according to claim 1, wherein the wireless gas detection system further comprises: a display module connected to the power supply module and the MCU control module, the The display module is used for displaying data information and parameters in the wireless gas detection system. 5. The NB-IOT-based wireless gas detection system according to claim 4, wherein the display module is an LED digital tube. 6. The NB-IOT-based wireless gas detection system according to claim 1, wherein the wireless gas detection system further comprises: a temperature monitoring module, connected to the power supply module and the MCU control module, the The temperature monitoring module is used for monitoring the temperature of the wireless gas detection system. 7. The NB-IOT-based wireless gas detection system according to claim 6, wherein the temperature monitoring module is a thermistor. 8. A wireless gas detector based on NB-IOT, characterized in that, comprising: a detector housing, which defines a plurality of installation cavities, wherein one of the installation cavities is a sensor air cavity; The NB-IOT-based wireless gas detection system according to any one of claims 1-7 is arranged in the installation cavity, and a gas acquisition module is arranged in the sensor air cavity; An explosion-proof casing is arranged on the detector casing to improve the explosion-proof performance of the wireless gas detector. 9 . The wireless gas detector based on NB-IOT according to claim 8 , wherein the sensor air cavity has an air guide cover, and the air guide cover is a single-sided and viscous bubble guide cotton. 10 .

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