Natural gas safety control system

Abstract

The utility model relates to the technical field of natural gas, and provides a natural gas safety control system which comprises a controller, a switch detection module, a flame detection module, a timing module and an alarm module. The switch detection module is connected with the controller and the flame detection module, is arranged at the position of a natural gas pipeline switch and is used for detecting whether the natural gas pipeline switch is turned on or not; the flame detection module is connected with the controller and used for detecting flames generated by the gas stove; the controller is connected with the timing module; the controller is connected with the alarm module. By means of the technical scheme, some safety problems existing in the natural gas using process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas, and in particular to a natural gas safety control system. Background Art

[0002] In order to improve the environmental quality in rural areas and increase energy efficiency, most rural areas have now switched from traditional coal burning to natural gas as the main energy supply. The use of coal will bring a lot of dust and dirt, and switching to natural gas can reduce these pollutions and improve the living environment of rural residents.

[0003] While natural gas brings convenience to the residential environment, it also brings some potential safety issues. For example, some elderly people forget to turn off the natural gas switch after cooking with natural gas. The pipes connecting the natural gas pipeline to the gas stove usually use rubber hoses, and such hoses have a certain service life. If the switch is not turned off for a long time, gas will continue to fill the hose, accelerating the aging and cracking of the hose, which may bring the risk of natural gas leakage. Utility Model Content

[0004] The utility model provides a natural gas safety control system to solve some safety problems existing in the process of using natural gas.

[0005] The technical solution of the utility model is as follows:

[0006] Natural gas safety control system, including controller, switch detection module, flame detection module, timing module and alarm module;

[0007] The switch detection module is connected to the controller and the flame detection module respectively, and the switch detection module is arranged at the switch position of the natural gas pipeline, and the switch detection module is used to detect whether the switch of the natural gas pipeline is turned on;

[0008] The flame detection module is connected to the controller, and the flame detection module is used to detect the flame generated by the gas stove;

[0009] The controller is connected to the timing module;

[0010] The controller is connected to the alarm module.

[0011] Furthermore, the utility model also includes a natural gas detection module and a valve control module;

[0012] The natural gas detection module is connected to the controller, and the natural gas detection module is used to detect natural gas leakage;

[0013] The controller is connected to the valve control module.

[0014] Furthermore, the utility model also includes a communication module;

[0015] The controller is communicatively connected with the monitoring platform via a communication module.

[0016] Further, the switch detection module in the present utility model includes a micro switch K1, a resistor R3, a diode D4, an amplifier U1, a voltage regulator tube D1, a transistor Q1, a resistor R2, a resistor R5 and a resistor R4;

[0017] The first end of the microswitch K1 is connected to a 5V power supply, the second end of the microswitch K1 is connected to the cathode of the voltage regulator D1 through the resistor R3, the anode of the voltage regulator D1 is grounded, the cathode of the voltage regulator D1 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the controller, the cathode of the voltage regulator D1 is connected to the non-inverting input of the amplifier U1, the output of the amplifier U1 is connected to the inverting input of the amplifier U1 through the resistor R4, the output of the amplifier U1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the second end of the microswitch K1, the base of the transistor Q1 is connected to the first end of the resistor R5 through the resistor R2, the second end of the resistor R5 is grounded, the first end of the resistor R5 is connected to the inverting input of the amplifier U1, and the emitter of the transistor Q1 is connected to the flame detection module.

[0018] Further, the flame detection module in the present utility model includes a flame sensor U2, a resistor R7, a resistor R8, an amplifier U3 and a resistor R9;

[0019] The power supply end of the flame sensor U2 is connected to the switch detection module, the ground end of the flame sensor U2 is grounded, the output end of the flame sensor U2 is connected to the in-phase input end of the amplifier U3 through the resistor R7, the inverting input end of the amplifier U3 is grounded through the resistor R8, the output end of the amplifier U3 is connected to the inverting input end of the amplifier U3 through the resistor R9, and the output end of the amplifier U3 is connected to the controller.

[0020] Furthermore, the flame detection module in the present utility model further includes a resistor R6, a capacitor C2 and a transistor Q2;

[0021] The first end of the resistor R6 is connected to the switch detection module, the second end of the resistor R6 is grounded through the capacitor C2, the collector of the transistor Q2 is connected to the first end of the resistor R6, the base of the transistor Q2 is connected to the second end of the resistor R6, and the emitter of the transistor Q2 is connected to the power supply end of the flame sensor U2.

[0022] Furthermore, the alarm module in the utility model includes a resistor R15, a transistor Q4, an alarm B1 and a light emitting diode LED1;

[0023] The first end of the resistor R15 is connected to the controller, the second end of the resistor R15 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first end of the alarm B1, the second end of the alarm B1 is connected to a 5V power supply, the anode of the light-emitting diode LED1 is connected to the 5V power supply, the cathode of the light-emitting diode LED1 is connected to the collector of the transistor Q4, and the emitter of the transistor Q4 is grounded.

[0024] Furthermore, the natural gas detection module in the present utility model includes a gas sensor U4, a resistor R18, a resistor R13, a resistor R11, an operational amplifier U5, a resistor R12 and a voltage regulator tube D2;

[0025] The power supply end of the gas sensor U4 is connected to a 5V power supply, the ground end of the gas sensor U4 is grounded, the output end of the gas sensor U4 is connected to the first non-inverting input end of the operational amplifier U5 through the resistor R11, the first inverting input end of the operational amplifier U5 is grounded through the resistor R18, and the first output end of the operational amplifier U5 is connected to the first inverting input end of the operational amplifier U5 through the resistor R13;

[0026] The first output end of the operational amplifier U5 is connected to the second non-inverting input end of the operational amplifier U5, the first end of the resistor R12 is connected to a 5V power supply, the second end of the resistor R12 is connected to the cathode of the voltage regulator tube D2, the anode of the voltage regulator tube D2 is grounded, the cathode of the voltage regulator tube D2 is connected to the second inverting input end of the operational amplifier U5, and the second output end of the operational amplifier U5 is connected to the controller.

[0027] The working principle and beneficial effects of the utility model are:

[0028] In the utility model, the switch detection module, flame detection module, timing module and alarm module are closely coordinated to realize the refined monitoring of the whole process of natural gas use. The system can not only ensure that natural gas is effectively used when there is a flame demand, but also timely identify and remind users to correct improper operations (such as forgetting to close the valve), effectively prevent safety hazards caused by improper use of natural gas, and greatly improve the safety of natural gas use and energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Figure 1 This is a structural block diagram of the natural gas safety control system in the utility model;

[0031] Figure 2 This is a circuit diagram of a disclosed embodiment of a natural gas safety control system in the utility model;

[0032] Figure 3 A circuit diagram of another disclosed embodiment of a natural gas safety control system in the utility model;

[0033] Figure 4 A circuit diagram of another disclosed embodiment of a natural gas safety control system in the utility model;

[0034] Figure 5 This is a circuit diagram of another disclosed embodiment of the natural gas safety control system in the utility model. DETAILED DESCRIPTION

[0035] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0036] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0037] Example 1

[0038] like Figure 1 As shown, this embodiment proposes a natural gas safety control system, including a controller, a switch detection module, a flame detection module, a timing module and an alarm module; the switch detection module is respectively connected to the controller and the flame detection module, the switch detection module is arranged at the natural gas pipeline switch position, and the switch detection module is used to detect whether the natural gas pipeline switch is turned on; the flame detection module is connected to the controller, and the flame detection module is used to detect the flame generated by the gas stove; the controller is connected to the timing module; the controller is connected to the alarm module.

[0039] In this embodiment, the switch detection module is arranged at the position of the natural gas switch, and is used to detect the state of the natural gas switch. When the natural gas switch is turned on, the natural gas switch can touch the switch module during the rotation process. The switch detection module also transmits the detection result to the controller in the form of an electrical signal. When the switch is turned on, the controller receives a signal indicating that the natural gas may be flowing or about to flow to the gas stove.

[0040] When the natural gas switch is turned on, it indicates that residents may need to use a gas stove to cook or boil water, etc. The switch detection module in this embodiment is connected to the flame detection module. The switch detection module also controls the flame detection module to turn on the working power, start detecting the flame of the gas stove, and convert the detected flame signal into an electrical signal to send to the controller.

[0041] When the natural gas switch is turned on, the controller also sends instructions to the timing module, and the timing module enters the timing state to determine whether the controller detects the electrical signal sent by the flame detection module within the set time (such as 30 minutes). If the controller receives the electrical signal sent by the flame detection module within the set time, it indicates that the natural gas is being used normally; if the controller does not receive the electrical signal sent by the flame detection module within the set time, it indicates that the gas stove is not used for cooking after the natural gas switch is turned on. In order to avoid accelerating the aging and cracking of the hose, the controller sends instructions to the alarm module. After receiving the alarm instruction, the alarm module sends an alarm signal to remind residents to turn off the natural gas switch.

[0042] After the natural gas switch is turned on, within the set timing time (such as 30 minutes), if the natural gas is used normally, the controller controls the timing module to reset the timing time to zero. When the gas stove is turned off, the flame detection module no longer sends an electrical signal to the controller. At this time, the controller controls the timing module again. If the resident does not close the natural gas valve within the set time (such as 30 minutes), the controller will send an alarm instruction to the alarm module again, controlling the alarm module to alarm, so as to remind the resident to close the natural gas valve in time.

[0043] The natural gas safety control system of this embodiment realizes refined monitoring of the entire process of natural gas use through the close cooperation of the switch detection module, flame detection module, timing module and alarm module. The system can not only ensure that natural gas is effectively used when there is a flame demand, but also promptly identify and remind users to correct improper operations (such as forgetting to close the valve), effectively prevent safety hazards caused by improper use of natural gas, and greatly improve the safety of natural gas use and energy efficiency.

[0044] like Figure 1 As shown, the natural gas safety control system in this embodiment also includes a natural gas detection module and a valve control module; the natural gas detection module is connected to the controller, and the natural gas detection module is used to detect natural gas leakage; the controller is connected to the valve control module.

[0045] In order to improve the safety protection function of the system, a natural gas detection module and a valve control module are also added in this embodiment.

[0046] Among them, the natural gas detection module is connected to the controller, independent of the flame detection module, and is specifically used to detect whether there is a natural gas leak in the environment. High-sensitivity sensor technology (such as catalytic combustion sensors, semiconductor sensors, infrared absorption sensors, etc.) can be used to monitor the natural gas concentration in real time. Once the natural gas concentration in the air exceeds the safety threshold, it indicates that there may be a leak. When a natural gas leak is detected, the natural gas detection module immediately generates a corresponding electrical signal and sends it to the controller. When the controller receives the electrical signal sent by the natural gas detection module, it can also send an alarm command to the alarm module to indicate the risk of natural gas leakage.

[0047] The valve control module is directly connected to the controller and receives control instructions from it. The valve control module is integrated with hardware devices such as the main valve or solenoid valve of the natural gas pipeline. At any time, if the natural gas detection module detects a leak, the controller will not only trigger the alarm module to issue an emergency alarm, but also immediately send instructions to the valve control module to remotely close the natural gas valve to prevent the leakage accident from further deteriorating.

[0048] After adding the natural gas detection module and the valve control module, the natural gas safety control system of this embodiment has the advanced protection capabilities of actively detecting leaks and remotely closing valves. It can discover and effectively contain natural gas leakage accidents in the first time, greatly improving the system's safety and ability to respond to emergencies, and providing more comprehensive protection for the living safety of natural gas users in rural areas and other regions.

[0049] like Figure 1 As shown, the natural gas safety control system in this embodiment also includes a communication module; the controller is connected to the monitoring platform through the communication module.

[0050] In the embodiment, a communication module is introduced as an important part of the system to enhance the remote monitoring and management capabilities of the system. The addition of the communication module enables the controller to establish a communication connection with an external monitoring platform to achieve functions such as data transmission, remote control and real-time monitoring.

[0051] Receive key information such as system status data, alarm information, valve control status, etc. sent by the controller in real time, and transmit these data to the remote monitoring platform through the selected communication network. Similarly, the communication module must also have the ability to receive instructions from the monitoring platform and forward the received remote control instructions to the controller so that the controller can perform corresponding operations according to the instructions, such as adjusting system parameters and performing remote valve control.

[0052] like Figure 2As shown, the switch detection module in this embodiment includes a micro switch K1, a resistor R3, a diode D4, an amplifier U1, a voltage regulator D1, a transistor Q1, a resistor R2, a resistor R5 and a resistor R4; the first end of the micro switch K1 is connected to a 5V power supply, the second end of the micro switch K1 is connected to the cathode of the voltage regulator D1 through the resistor R3, the anode of the voltage regulator D1 is grounded, the cathode of the voltage regulator D1 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the controller, the cathode of the voltage regulator D1 is connected to the non-inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the inverting input end of the amplifier U1 through the resistor R4, the output end of the amplifier U1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the second end of the micro switch K1, the base of the transistor Q1 is connected to the first end of the resistor R5 through the resistor R2, the second end of the resistor R5 is grounded, the first end of the resistor R5 is connected to the inverting input end of the amplifier U1, and the emitter of the transistor Q1 is connected to the flame detection module.

[0053] In this embodiment, the micro switch K1 is arranged at the position of the natural gas switch. When the natural gas switch is turned on, the micro switch K1 is triggered to close. When the natural gas switch is turned off, the micro switch K1 is opened.

[0054] Based on this, the working principle of the switch detection module is as follows: the resistor R3 and the voltage regulator D1 form a voltage regulator circuit. When the micro switch K1 is closed, it indicates that the natural gas switch is turned on. At this time, a stable 2.5V voltage signal is generated on the voltage regulator D1. The voltage signal is sent to the controller, and the controller determines whether the natural gas switch is turned on through the signal. At the same time, the 2.5V power supply is also used as a reference voltage for the in-phase input terminal of the amplifier U1. The amplifier U1 forms an amplification circuit. When the micro switch K1 is closed, the amplifier U1 outputs a positive voltage signal and adds it to the base of the transistor Q1. The transistor Q1 is turned on. At this time, the 5V power supply is output after the transistor Q1. The power supply is used as the working power supply of the flame detection module. When the flame detection module is connected to the 5V power supply, it starts to work.

[0055] When the flame detection module is working, if the working current is unstable, it may affect the detection result. Therefore, the resistor R2 and the resistor R5 form a voltage divider circuit. When the emitter current of the transistor Q1 increases, the voltage on the resistor R5 increases. At this time, the amplifier U1 forms a comparison amplifier. The voltage at the inverting input terminal of the amplifier U1 increases, thereby reducing the output voltage of the amplifier U1, and the base current of the transistor Q1 decreases. The transistor Q1 works in an amplification state. When the base current of the transistor Q1 decreases, the emitter current of the transistor Q1 also decreases, thereby suppressing the increase of the working current of the flame detection module. Similarly, when the current output by the transistor Q1 decreases, the voltage output by the amplifier U1 increases, causing the emitter current of the transistor Q1 to increase, thereby suppressing the decrease of the working current of the flame detection module. In turn, a stable and reliable working current is provided for the flame detection module, improving the reliability of the circuit.

[0056] like Figure 2 As shown, the flame detection module in this embodiment includes a flame sensor U2, a resistor R7, a resistor R8, an amplifier U3 and a resistor R9; the power supply end of the flame sensor U2 is connected to the switch detection module, the ground end of the flame sensor U2 is grounded, the output end of the flame sensor U2 is connected to the in-phase input end of the amplifier U3 through the resistor R7, the inverting input end of the amplifier U3 is grounded through the resistor R8, the output end of the amplifier U3 is connected to the inverting input end of the amplifier U3 through the resistor R9, and the output end of the amplifier U3 is connected to the controller.

[0057] In this embodiment, when the natural gas switch is closed, the flame detection module enters the working state, the flame sensor U2 is used to detect the flame of the gas stove and convert the flame signal into an electrical signal output. The flame sensor U2 in this embodiment is an infrared flame sensor, which is used to detect the flame and emit a specific infrared signal. In actual applications, the electrical signal output by the flame sensor U2 is relatively weak. Therefore, the amplifier U3 constitutes an amplification circuit, which is used to amplify the electrical signal output by the flame sensor U2, and finally sends the amplified electrical signal to the controller.

[0058] The resistor R10 and the capacitor C5 form a filter circuit for filtering out interference signals in the output electrical signal of the amplifier U3.

[0059] like Figure 2 As shown, in this embodiment, the flame detection module also includes a resistor R6, a capacitor C2 and a transistor Q2; the first end of the resistor R6 is connected to the switch detection module, the second end of the resistor R6 is grounded through the capacitor C2, the collector of the transistor Q2 is connected to the first end of the resistor R6, the base of the transistor Q2 is connected to the second end of the resistor R6, and the emitter of the transistor Q2 is connected to the power supply end of the flame sensor U2.

[0060] In this embodiment, when the micro switch K1 is closed, a high-frequency impact current may be generated, which may directly cause permanent damage to the flame sensor U2. Therefore, the resistor R6, the capacitor C2 and the transistor Q2 form a buffer circuit.

[0061] When the micro switch K1 is closed, the current output by the transistor Q1 charges the capacitor C2, and the voltage across the capacitor C2 slowly increases from 0. Therefore, the transistor Q2 is not turned on at the moment the micro switch K1 is closed. When the voltage on the capacitor C2 exceeds the turn-on voltage of the transistor Q2, the transistor Q2 is turned on, and the current passes through the transistor Q2 and is added to the power supply end of the flame sensor U2.

[0062] like Figure 3 As shown, the alarm module in this embodiment includes a resistor R15, a transistor Q4, an alarm B1 and a light emitting diode LED1; the first end of the resistor R15 is connected to the controller, the second end of the resistor R15 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first end of the alarm B1, the second end of the alarm B1 is connected to a 5V power supply, the anode of the light emitting diode LED1 is connected to the 5V power supply, the cathode of the light emitting diode LED1 is connected to the collector of the transistor Q4, and the emitter of the transistor Q4 is grounded.

[0063] In this embodiment, the alarm module is used to generate an alarm signal. The alarm module is controlled by a controller. When an alarm is needed, the controller outputs a high-level signal which is limited by resistor R15 and then added to the base of transistor Q4. Transistor Q4 works in a switching state. Transistor Q4 is turned on, and alarm B1 and light-emitting diode LED1 are connected to a 5V power supply at the same time. At this time, alarm B1 sends out an alarm signal, and at the same time, light-emitting diode LED1 emits light.

[0064] like Figure 4 As shown, the natural gas detection module in this embodiment includes a gas sensor U4, a resistor R18, a resistor R13, a resistor R11, an operational amplifier U5, a resistor R12 and a voltage regulator D2; the power supply end of the gas sensor U4 is connected to a 5V power supply, the ground end of the gas sensor U4 is grounded, the output end of the gas sensor U4 is connected to a first non-inverting input end of the operational amplifier U5 through a resistor R11, the first inverting input end of the operational amplifier U5 is grounded through a resistor R18, and the first output end of the operational amplifier U5 is connected to a first inverting input end of the operational amplifier U5 through a resistor R13; the first output end of the operational amplifier U5 is connected to a second non-inverting input end of the operational amplifier U5, the first end of the resistor R12 is connected to a 5V power supply, the second end of the resistor R12 is connected to the cathode of the voltage regulator D2, the anode of the voltage regulator D2 is grounded, the cathode of the voltage regulator D2 is connected to the second inverting input end of the operational amplifier U5, and the second output end of the operational amplifier U5 is connected to the controller.

[0065] In this embodiment, the natural gas detection module is used to detect whether there is a natural gas leak in the environment, wherein the gas sensor U4 is used to detect natural gas in the air and convert the detected natural gas signal into an electrical signal output, but the electrical signal output by the gas sensor U4 is also relatively weak. In order to effectively identify the electrical signal output by the gas sensor U4, it needs to be amplified. The operational amplifier U5 contains two independent amplifiers, the first in-phase input terminal of the operational amplifier U5, the first inverting input terminal of the operational amplifier U5, the first output terminal of the operational amplifier U5, the resistor R18, the resistor R13 and the resistor R11 constitute an amplifier circuit for amplifying the electrical signal output by the gas sensor U4, the second in-phase input terminal of the operational amplifier U5, the second inverting input terminal of the operational amplifier U5, the second output terminal of the operational amplifier U5, the resistor R12 and the voltage regulator D2 constitute a comparison circuit, when the concentration of natural gas in the environment exceeds the set value, the second output terminal of the operational amplifier U5 outputs a high level, otherwise, the second output terminal of the operational amplifier U5 outputs a low level. The controller can determine whether a natural gas leak occurs through the level signal of the second output terminal of the operational amplifier U5.

[0066] like Figure 5 As shown, in this embodiment, the valve control module includes a resistor R14, a switch tube Q3 and a solenoid valve L1; the first end of the resistor R14 is connected to the controller, the second end of the resistor R14 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the first power supply end of the solenoid valve L1, the second power supply end of the solenoid valve L1 is connected to the VCC power supply, and the second end of the switch tube Q3 is grounded.

[0067] In this embodiment, when the controller outputs a low level, the switch tube Q3 is turned off, cutting off the power supply path of the solenoid valve L1. The magnetic field of the solenoid valve coil disappears, and the valve disc returns to its initial position under the action of the reset spring or its own weight, and the solenoid valve L1 is in an open state. When the controller outputs a high level, the current flows into the control end of the switch tube Q3 through the resistor R14, turning on the switch tube. At this time, the VCC power supply provides working current to the solenoid valve L1 through the turned-on switch tube Q3. The solenoid valve coil generates a magnetic field, drives the valve disc to move, and the solenoid valve L1 is closed.

[0068] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. Natural gas safety control system, characterized in that: It includes a controller, a switch detection module, a flame detection module, a timing module and an alarm module; The switch detection module is connected to the controller and the flame detection module respectively, and the switch detection module is arranged at the switch position of the natural gas pipeline, and the switch detection module is used to detect whether the switch of the natural gas pipeline is turned on; The flame detection module is connected to the controller, and the flame detection module is used to detect the flame generated by the gas stove; The controller is connected to the timing module; The controller is connected to the alarm module; The switch detection module includes a micro switch K1, a resistor R3, a diode D4, an amplifier U1, a voltage regulator D1, a transistor Q1, a resistor R2, a resistor R5 and a resistor R4; The first end of the micro switch K1 is connected to a 5V power supply, the second end of the micro switch K1 is connected to the cathode of the voltage regulator tube D1 through the resistor R3, the anode of the voltage regulator tube D1 is grounded, the cathode of the voltage regulator tube D1 is connected to the anode of the diode D4, the cathode of the diode D4 is connected to the controller, the cathode of the voltage regulator tube D1 is connected to the non-inverting input end of the amplifier U1, the output end of the amplifier U1 is connected to the inverting input end of the amplifier U1 through the resistor R4, the output end of the amplifier U1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the second end of the micro switch K1, the base of the transistor Q1 is connected to the first end of the resistor R5 through the resistor R2, the second end of the resistor R5 is grounded, the first end of the resistor R5 is connected to the inverting input end of the amplifier U1, and the emitter of the transistor Q1 is connected to the flame detection module; The flame detection module includes a flame sensor U2, a resistor R7, a resistor R8, an amplifier U3 and a resistor R9; The power supply end of the flame sensor U2 is connected to the switch detection module, the ground end of the flame sensor U2 is grounded, the output end of the flame sensor U2 is connected to the in-phase input end of the amplifier U3 through the resistor R7, the inverting input end of the amplifier U3 is grounded through the resistor R8, the output end of the amplifier U3 is connected to the inverting input end of the amplifier U3 through the resistor R9, and the output end of the amplifier U3 is connected to the controller; The flame detection module also includes a resistor R6, a capacitor C2 and a transistor Q2; The first end of the resistor R6 is connected to the switch detection module, the second end of the resistor R6 is grounded through the capacitor C2, the collector of the transistor Q2 is connected to the first end of the resistor R6, the base of the transistor Q2 is connected to the second end of the resistor R6, and the emitter of the transistor Q2 is connected to the power supply end of the flame sensor U2.

2. The natural gas safety control system according to claim 1, characterized in that: It also includes a natural gas detection module and a valve control module; The natural gas detection module is connected to the controller, and the natural gas detection module is used to detect natural gas leakage; The controller is connected to the valve control module.

3. The natural gas safety control system according to claim 2, characterized in that: Also includes a communication module; The controller is communicatively connected with the monitoring platform via a communication module.

4. The natural gas safety control system according to claim 2, characterized in that: The alarm module includes a resistor R15, a transistor Q4, an alarm B1 and a light emitting diode LED1; The first end of the resistor R15 is connected to the controller, the second end of the resistor R15 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first end of the alarm B1, the second end of the alarm B1 is connected to a 5V power supply, the anode of the light-emitting diode LED1 is connected to the 5V power supply, the cathode of the light-emitting diode LED1 is connected to the collector of the transistor Q4, and the emitter of the transistor Q4 is grounded.

5. The natural gas safety control system according to claim 2, characterized in that: The natural gas detection module includes a gas sensor U4, a resistor R18, a resistor R13, a resistor R11, an operational amplifier U5, a resistor R12 and a voltage regulator tube D2; The power supply end of the gas sensor U4 is connected to a 5V power supply, the ground end of the gas sensor U4 is grounded, the output end of the gas sensor U4 is connected to the first non-inverting input end of the operational amplifier U5 through the resistor R11, the first inverting input end of the operational amplifier U5 is grounded through the resistor R18, and the first output end of the operational amplifier U5 is connected to the first inverting input end of the operational amplifier U5 through the resistor R13; The first output end of the operational amplifier U5 is connected to the second non-inverting input end of the operational amplifier U5, the first end of the resistor R12 is connected to a 5V power supply, the second end of the resistor R12 is connected to the cathode of the voltage regulator tube D2, the anode of the voltage regulator tube D2 is grounded, the cathode of the voltage regulator tube D2 is connected to the second inverting input end of the operational amplifier U5, and the second output end of the operational amplifier U5 is connected to the controller.

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