Remote gas leakage cut-off system

Abstract

The utility model discloses a remote gas leakage cut-off system which comprises a wireless communication power supply, a detection circuit power supply, a system power supply, a key input circuit, an ADC detection circuit, a valve driving circuit and a sound-light alarm circuit which are respectively connected with a battery. The wireless communication power supply is connected with an NBIoT wireless communication circuit, and the NBIoT wireless communication circuit is connected with an SIM card circuit and a level conversion circuit; the detection circuit power supply is connected with a combustible gas detection circuit; by adding the NBIoT wireless communication circuit, the state of the system can be uploaded to a management platform in real time through the NBIoT wireless communication circuit, so that a user can timely discover the gas leakage condition through monitoring of a mobile phone or a computer when being far away from home, and possible personal injury and environmental pollution are reduced. And gas supply is cut off remotely when necessary, so that safety risks are reduced, and the technical problem that in the prior art, gas abnormal conditions cannot be reported in time is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas engineering, and relates to a gas leakage cut-off system, specifically a remote gas leakage cut-off system. Background Technique

[0002] To deal with the possible leakage of gas pipeline systems to ensure the safety of personnel and the environment. The development of this technology has received attention in engineering safety and environmental protection, as well as concern for energy utilization efficiency. With the continuous development and popularization of gas supply systems, gas leakage cut-off technology has also received more research and application.

[0003] Existing common gas leakage cut-off devices operate independently. After automatically alarming and closing the valve in case of an abnormal situation, they cannot report the abnormal situation to the gas management platform and the user side. After an abnormal situation occurs, it is impossible for manual workers to go to the site in time to check the problem, which will pose some safety hazards. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a remote gas leakage cut-off system to solve the technical problem that the existing technology cannot realize gas abnormal situations and report them in time.

[0005] To solve the above technical problems, the utility model is implemented by adopting the following technical solutions:

[0006] A remote gas leakage cut-off system includes a wireless communication power supply, a detection circuit power supply, a system power supply, a key input circuit, an ADC detection circuit, a valve drive circuit, and an audible and visual alarm circuit, which are respectively connected to a battery;

[0007] An NB_IoT wireless communication circuit is connected to the wireless communication power supply, and a SIM card circuit and a level conversion circuit are connected to the NB_IoT wireless communication circuit; a combustible gas detection circuit is connected to the detection circuit power supply;

[0008] An MCU circuit is connected to the system power supply, and the MCU circuit is respectively connected to the key input circuit, the ADC detection circuit, the valve drive circuit, the audible and visual alarm circuit, the system power supply, the combustible gas detection circuit, the wireless communication power supply, the detection circuit power supply, and the level conversion circuit; a data storage circuit is also connected to the MCU circuit.

[0009] The utility model further includes the following technical features:

[0010] The system power supply circuit includes a voltage regulator module U2, a capacitor C23, and a capacitor C2. Among them, pin 1 of the voltage regulator module U2 is grounded, pin 2 of the voltage regulator module U2 is connected to the battery VCC, pin 3 of the voltage regulator module U2 is commonly connected to one end of the capacitor C23, one end of the capacitor C24, and the MCU circuit, and the second ends of the capacitor C23 and the capacitor C24 are connected and grounded.

[0011] The wireless communication power supply circuit includes a voltage regulator module U8, a capacitor C11, a capacitor C9, a capacitor C12, and a capacitor C10. Among them, pin 5 of the voltage regulator module U8 is commonly connected to the positive electrode of the capacitor C11, one end of the capacitor C9, and the NB_IoT wireless communication circuit. The negative electrode of the capacitor C11 and the second end of the capacitor C9 are both grounded; pin 4 of the voltage regulator module U8 is commonly connected to the positive electrode of the capacitor C12, one end of the capacitor C10, and the battery VCC. The negative electrode of the capacitor C12 and the second end of the capacitor C10 are both grounded; pin 5 of the voltage regulator module U8 is commonly grounded with the positive electrode of the capacitor C11, one end of the capacitor C9, the positive electrode of the capacitor C12, and the capacitor C10; pin 3 of the voltage regulator module U8 is connected to the MCU circuit.

[0012] The detection power supply circuit includes a voltage regulator module U12, a capacitor C2, a capacitor C8, a capacitor C1, and a capacitor C3. Among them, pin 4 of the voltage regulator module U12 is commonly connected to the positive electrode of the capacitor C1, one end of the capacitor C3, and the battery VCC; pin 5 of the voltage regulator module U12 is commonly connected to the positive electrode of the capacitor C2, one end of the capacitor C8, and the combustible gas detection circuit; the negative electrode of the capacitor C2, the second end of the capacitor C8, the negative electrode of the capacitor C1, and the second end of the capacitor C3 are commonly grounded; pin 3 of the voltage regulator module U12 is connected to the MCU circuit, and pin 3 of the voltage regulator module U12 is grounded.

[0013] The NB_IoT wireless communication circuit includes a wireless communication module U9, an antenna socket ANT1, a capacitor C19, a capacitor C15, a capacitor C14, and a capacitor C13. Among them, pins 31 and 32 of the wireless communication module U9 are commonly connected to one end of the capacitor C15, one end of the capacitor C14, one end of the capacitor C13, and the wireless communication power supply circuit. The second ends of the capacitor C15, the capacitor C14, and the capacitor C13 are commonly connected and grounded; pin 20 of the wireless communication module U9 is connected to one end of the capacitor C19, and the second end of the capacitor C19 is grounded; pin 1 of the antenna socket ANT1 is connected to pin 27 of the wireless communication module U9, and pin 2 of the antenna socket ANT1 is commonly connected and grounded to pins 30, 29, 28, 26, 25, 23, and 22 of the wireless communication module U9.

[0014] The SIM card circuit includes SIM card U10, resistors R9, R10, R11, capacitors C16, C17, C18 and capacitor C4. Among them, pin 1 of SIM card U10 is connected to one end of capacitor C4 and grounded. The second end of capacitor C4 is connected to pin 8 of SIM card U10 and the NB-IoT wireless communication circuit. Pin 3 of SIM card U10 is commonly connected to one end of resistor R11 and one end of capacitor C16. The second end of resistor R11 is connected to the NB-IoT wireless communication circuit. Pin 6 of SIM card U10 is commonly connected to one end of resistor R10 and one end of capacitor C17. The second end of resistor R10 is connected to the NB-IoT wireless communication circuit. Pin 7 of SIM card U10 is commonly connected to one end of resistor R9 and one end of capacitor C18. The second end of resistor R9 is connected to the NB-IoT wireless communication circuit. The second ends of capacitors C16, C17 and C18 are commonly grounded. Pins 2, 4 and 5 of SIM card U10 are floating.

[0015] The signal level conversion circuit includes resistors R4 and R1. Among them, one end of resistor R4 is connected to the MCU circuit, and the second end of resistor R4 is connected to the NB-IoT wireless communication circuit. One end of resistor R1 is connected to the MCU circuit, and the second end of resistor R1 is commonly connected to one end of resistor R2 and the NB-IoT wireless communication circuit. The second end of resistor R2 is grounded.

[0016] The valve drive circuit includes valve drive chip U5, connector FA, resistors R14 and R15. Among them, pin 1 of valve drive chip U5 is connected to one end of capacitor C21, and the second end of capacitor C21 is grounded. Pins 2 and 3 of valve drive chip U5 are respectively connected to pins 1 and 2 of connector FA. Pin 5 of valve drive chip U5 is commonly connected to one end of resistor R15 and pin 19 of microcontroller U3 of the MCU circuit. Pin 6 of valve drive chip U5 is commonly connected to one end of resistor R14 and the MCU circuit. Pin 8 of valve drive chip U5 is connected to the second end of resistor R14, the second end of resistor R15 and battery VCC. Pin 7 of valve drive chip U5 is connected to the MCU circuit. Pins 9 and 4 of valve drive chip U5 are both grounded.

[0017] The combustible gas detection circuit includes a combustible gas sensor U7, an arithmetic unit chip U6, a capacitor C6, a capacitor C5, a capacitor C7, a resistor R8, a resistor R6, and a resistor R7. Among them, pins 4, 6, and 2 of the combustible gas sensor U7 are commonly connected to one end of the capacitor C6, the positive electrode of the capacitor C5, one end of the variable resistor R7, pin 8 of the arithmetic unit chip U6, and the detection power supply circuit. Pin 5 of the combustible gas sensor U7 is connected to one end of the resistor R8. The second end of the resistor R8 is commonly connected to the second end of the capacitor C6, the negative electrode of the capacitor C5, the second end of the variable resistor R7, one end of the capacitor C7, and pin 4 of the arithmetic unit chip U6. The second end of the capacitor C7 is commonly connected to pin 1 of the arithmetic unit chip U6 and the MCU circuit. Pin 1 of the combustible gas sensor U7 is connected to one end of the resistor R6. The second end of the resistor R6 is grounded. Pin 3 of the combustible gas sensor U7 is connected to pin 2 of the arithmetic unit chip U6. The sliding end of the variable resistor is connected to pin 3 of the arithmetic unit chip U6.

[0018] The data storage circuit includes a storage chip U11, a resistor R17, and a resistor R18. Among them, pins 1, 2, 3, 4, and 7 of the storage chip U11 are all grounded. Pin 8 of the storage chip U11 is commonly connected to one end of the resistor R17, one end of the resistor R18, and the MCU circuit. Pin 6 of the storage chip U11 is commonly connected to the second end of the resistor R17 and the MCU circuit. Pin 5 of the storage chip U11 is commonly connected to the second end of the resistor R18 and the MCU circuit.

[0019] The sound and light alarm circuit includes a triode Q2, a buzzer BUZZER1, an LED1, a resistor R3, and a resistor R5. Among them, the emitter of the triode Q2 is connected to the battery VCC. The base of the triode Q2 is connected to one end of the resistor R3. The second end of the resistor R3 is connected to the MCU circuit. The collector of the triode Q2 is commonly connected to one end of the resistor R5 and the positive electrode of the buzzer BUZZER1. The second end of the resistor R5 is connected to the positive electrode of the LED1. The negative electrode of the LED1 and the negative electrode of the buzzer BUZZER1 are both grounded.

[0020] The ADC detection circuit includes a resistor R12, a resistor R13, and a capacitor C20. Among them, one end of the resistor R12 is connected to the battery VCC. The second end of the resistor R12 is commonly connected to one end of the resistor R13, one end of the capacitor C20, and the MCU circuit. The second end of the resistor R13 is connected to the second end of the capacitor C20 and grounded.

[0021] The key input circuit includes a key S2, a resistor R16, and a capacitor C22. Among them, one end of the resistor R16 is connected to the battery VCC. The second end of the resistor R16 is commonly connected to one end of the capacitor C22, one end of the key S2, and the MCU circuit. The second end of the capacitor C22 is connected to the second end of the key S2 and grounded.

[0022] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:

[0023] By adding an NB_IoT wireless communication circuit in the present utility model, the system status can be uploaded to the management platform in real time through the NB_IoT wireless communication circuit. When the user is away from home, they can monitor through a mobile phone or computer in time to detect gas leakage, reducing possible personal injuries and environmental pollution. And remotely cut off the gas supply when necessary to reduce safety risks, solving the technical problem that the prior art cannot detect abnormal gas conditions and report them in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a remote gas leakage cut-off system of the present utility model.

[0025] Figure 2 It is a circuit diagram of the system power supply circuit.

[0026] Figure 3 It is a circuit diagram of the wireless communication power supply circuit.

[0027] Figure 4 It is a circuit diagram of the detection power supply circuit.

[0028] Figure 5 It is a circuit diagram of the MCU circuit.

[0029] Figure 6 It is a circuit diagram of the NB_IoT wireless communication circuit.

[0030] Figure 7 It is a circuit diagram of the SIM card circuit.

[0031] Figure 8 It is a circuit diagram of the signal level conversion circuit.

[0032] Figure 9 It is a circuit diagram of the valve drive circuit.

[0033] Figure 10 It is a circuit diagram of the combustible gas detection circuit.

[0034] Figure 11 It is a circuit diagram of the data storage circuit.

[0035] Figure 12 It is a circuit diagram of the sound and light alarm circuit.

[0036] Figure 13 It is a circuit diagram of the ADC detection circuit.

[0037] Figure 14 It is a circuit diagram of the key input circuit.

[0038] The following further elaborates on the specific content of the present utility model in conjunction with embodiments. Specific Embodiment

[0039] It should be noted that all components in the present utility model, without special instructions, are components known in the art.

[0040] The following provides specific embodiments of the present utility model. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of this application fall within the protection scope of the present utility model.

[0041] The present utility model provides a remote gas leakage cut-off system, which includes a wireless communication power supply, a detection circuit power supply, a system power supply, a key input circuit, an ADC detection circuit, a valve drive circuit, and an audible and visual alarm circuit, all of which are respectively connected to a battery;

[0042] An NB_IoT wireless communication circuit is connected to the wireless communication power supply, and a SIM card circuit and a level conversion circuit are connected to the NB_IoT wireless communication circuit; a combustible gas detection circuit is connected to the detection circuit power supply;

[0043] An MCU circuit is connected to the system power supply, and the MCU circuit is respectively connected to the key input circuit, the ADC detection circuit, the valve drive circuit, the audible and visual alarm circuit, the system power supply, the combustible gas detection circuit, the wireless communication power supply, the detection circuit power supply, and the level conversion circuit; a data storage circuit is also connected to the MCU circuit.

[0044] In the above technical solution, after the external 3.6V battery is stepped down and regulated to 3.3V by the system power supply, the detection circuit power supply, and the wireless communication power supply, it is respectively supplied to the MCU circuit, the combustible gas detection circuit, and the NB_IoT wireless communication circuit. The MCU circuit will read the voltage value output by the combustible gas detection circuit according to the set acquisition time and calculate the concentration value, and store the concentration value in the data storage circuit. If the concentration value exceeds the set value, the MCU circuit will close the valve through the valve drive circuit, and read the stored concentration data and send it to the management platform through the NB_IoT wireless communication circuit. The MCU circuit calculates the voltage of the battery through the voltage output by its voltage dividing circuit and stores it in the data storage circuit. The MCU circuit will send the stored data to the management platform through the NB_IoT wireless communication circuit according to the set upload time. When the key in the key circuit is pressed, the MCU circuit will send all the stored concentration data, battery voltage, and valve status to the management platform through the NB_IoT wireless communication circuit.

[0045] See Figure 5As shown in the figure, the MCU circuit uses a microcontroller U3 and its peripheral circuit. The peripheral circuit includes a connector H1, capacitors C27, C25, C26, and a crystal oscillator X1. Among them, pin 1 and pin 64 of the microcontroller U3 are commonly connected to one end of the capacitor C27 and the system power supply, and the second end of the capacitor C27 is grounded; pin 8 of the microcontroller U3 is commonly connected to one end of the capacitor C25 and one end of the crystal oscillator X1, pin 9 of the microcontroller U3 is commonly connected to one end of the capacitor C26 and the second end of the crystal oscillator X1, and the second end of the capacitor C26 is connected to the second end of the capacitor C25 and grounded; pin 1 and pin 3 of the connector H1 are respectively connected to pin 35 and pin 34 of U3, and pin 2 of the connector H1, pin 62 and pin 63 of U3 are all grounded.

[0046] The MCU circuit is used to provide data processing and control for the system. Among them, the microcontroller U3 is used to process, store, and upload concentration data, and can also automatically control the valve according to the pressure state; the crystal oscillator X1, capacitors C25, and C26 provide a 32.768 KHz clock for the microcontroller. The capacitor C27 filters the voltage input to the controller.

[0047] The models of the microcontroller U3 and the connector H1 are MSP430F248T and HDR2.54-LI-3P respectively. The values of the capacitors C27, C25, C26, and the crystal oscillator X1 are 100 nF, 22 pF, 22 pF, and 32.768 K respectively.

[0048] Preferably, the battery input power supply uses a single 3.6V lithium battery ES-341550 / W for power supply.

[0049] By adding an NB_IoT wireless communication circuit in the present utility model, the system status can be uploaded to the management platform in real time through the NB_IoT wireless communication circuit. When the user is away from home, they can monitor and timely detect gas leakage through a mobile phone or computer, reducing possible personal injuries and environmental pollution. And remotely cut off the gas supply when necessary to reduce safety risks, solving the technical problem that the prior art cannot detect gas abnormal conditions and report them in time.

[0050] See Figure 2 As shown in the figure, the system power supply circuit includes a voltage regulator module U2, capacitors C23 and C2. Among them, pin 1 of the voltage regulator module U2 is grounded, pin 2 of the voltage regulator module U2 is connected to the battery VCC, pin 3 of the voltage regulator module U2 is commonly connected to one end of the capacitor C23, one end of the capacitor C24, and the MCU circuit, and the second ends of the capacitor C23 and the capacitor C24 are connected and grounded.

[0051] In the above technical solution, the system power supply circuit is used to output 3.3V to supply power to the microcontroller. Among them, the voltage regulator chip U2 is an LDO type voltage regulator circuit, which is used to stabilize the input power supply to 3.3V power supply for output; the capacitors C23 and C24 filter the power supply output by the voltage regulator chip U2.

[0052] Among them, pin 3 of the voltage regulator module U2 is connected to one end of the capacitor C23, one end of the capacitor C24, and pin 1 of the microcontroller U3 in the MCU circuit.

[0053] The model of the voltage regulator module U2 is 6250-33C. The values of the capacitors C23 and C24 are 100uF and 100nF respectively.

[0054] See Figure 3 As shown, the wireless communication power supply circuit includes a voltage regulator module U8, capacitors C11, C9, C12, and C10. Among them, pin 5 of the voltage regulator module U8 is connected to the positive electrode of the capacitor C11, one end of the capacitor C9, and the NB_IoT wireless communication circuit. The negative electrode of the capacitor C11 and the second end of the capacitor C9 are both grounded; pin 4 of the voltage regulator module U8 is connected to the positive electrode of the capacitor C12, one end of the capacitor C10, and the battery VCC. The negative electrode of the capacitor C12 and the second end of the capacitor C10 are both grounded; pin 5 of the voltage regulator module U8, the positive electrode of the capacitor C11, one end of the capacitor C9, the positive electrode of the capacitor C12, and the capacitor C10 are all grounded; pin 3 of the voltage regulator module U8 is connected to the MCU circuit.

[0055] In the above technical solution, the wireless communication power supply circuit is used to provide 3.3V power supply for the NB_IoT wireless communication circuit. Among them, the voltage regulator chip U8 is an LDO type voltage regulator circuit, which is used to stabilize the input power supply to 3.3V power supply for output; the capacitors C12 and C10 filter the power supply input to the voltage regulator chip U8, and the capacitors C11 and C9 filter the power supply output by the voltage regulator chip U8.

[0056] Among them, pin 3 of the voltage regulator module U8 is connected to pin 37 of the microcontroller U3 in the MCU circuit.

[0057] The model of the voltage regulator module U8 is MD7218E33.

[0058] The values of the capacitors C11, C9, C12, and C10 are 100uF, 100nF, 100uF, and 100nF respectively.

[0059] See Figure 4As shown in the figure, the detection power supply circuit includes a voltage regulator module U12, capacitors C2, C8, C1, and C3. Among them, pin 4 of the voltage regulator module U12 is commonly connected to the positive electrode of capacitor C1, one end of capacitor C3, and the battery VCC; pin 5 of the voltage regulator module U12 is commonly connected to the positive electrode of capacitor C2, one end of capacitor C8, and the combustible gas detection circuit; the negative electrodes of capacitor C2, the second end of capacitor C8, the negative electrode of capacitor C1, and the second end of capacitor C3 are commonly grounded; pin 3 of the voltage regulator module U12 is connected to the MCU circuit, and pin 3 of the voltage regulator module U12 is grounded.

[0060] In the above technical solution, the detection power supply circuit is used to provide a 3.3V power supply for the combustible gas detection circuit. Among them, the voltage regulator chip U12 is an LDO type voltage regulator circuit, which is used to stabilize the input power supply to 3.3V for output; capacitors C1 and C3 filter the power supply input to the voltage regulator chip U12, and capacitors C2 and C8 filter the power supply output by the voltage regulator chip U12.

[0061] Among them, pin 3 of the voltage regulator module U12 is connected to pin 3 of the microcontroller U3 of the MCU circuit, and pin 3 of the voltage regulator module U12 is grounded.

[0062] The model of the voltage regulator module U12 is MD7218E33. The values of capacitors C2, C8, C1, and C3 are 100uF, 100nF, 100uF, and 100nF respectively.

[0063] See Figure 6 As shown in the figure, the NB_IoT wireless communication circuit includes a wireless communication module U9, an antenna socket ANT1, capacitors C19, C15, C14, and C13. Among them, pins 31 and 32 of the wireless communication module U9 are commonly connected to one end of capacitor C15, one end of capacitor C14, one end of capacitor C13, and the wireless communication power supply circuit. The second end of capacitor C15 is commonly connected to the second end of capacitor C14 and the second end of capacitor C13 and is grounded; pin 20 of the wireless communication module U9 is connected to one end of capacitor C19, and the second end of capacitor C19 is grounded; pin 1 of the antenna socket ANT1 is connected to pin 27 of the wireless communication module U9, and pin 2 of the antenna socket ANT1 is commonly connected to pins 30, 29, 28, 26, 25, 23, and 22 of the wireless communication module U9 and is grounded.

[0064] In the above technical solution, the NB_IoT wireless communication circuit is used to upload the collected concentration status data to the management platform through the network. Among them, the NB-IoT module U9 is used to send the pressure data to the management platform through the NB-IoT network; the capacitors C13, C14, and C15 filter the power supply input to the NB-IoT module U9. The capacitor C19 filters the voltage signal output by the NB-IoT module U9. ANT1 is an external antenna of the NB-IoT module U9 to obtain a good network signal.

[0065] The models of the wireless communication module U9 and the antenna socket ANT1 are M5311 and SMA_KE respectively. The values of the capacitors C19, C15, C14, and C13 are 100uF, 100nF, 33pF respectively.

[0066] See Figure 7 As shown, the SIM card circuit includes the SIM card U10, resistors R9, R10, R11, capacitors C16, C17, C18, and capacitor C4. Among them, pin 1 of the SIM card U10 is connected to one end of the capacitor C4 and grounded, and the second end of the capacitor C4 is connected to pin 8 of the SIM card U10 and the NB_IoT wireless communication circuit; pin 3 of the SIM card U10 is commonly connected to one end of the resistor R11 and one end of the capacitor C16, and the second end of the resistor R11 is connected to the NB_IoT wireless communication circuit; pin 6 of the SIM card U10 is commonly connected to one end of the resistor R10 and one end of the capacitor C17, and the second end of the resistor R10 is connected to the NB_IoT wireless communication circuit; pin 7 of the SIM card U10 is commonly connected to one end of the resistor R9 and one end of the capacitor C18, and the second end of the resistor R9 is connected to the NB_IoT wireless communication circuit; the second ends of the capacitors C16, C17, and C18 are commonly grounded; pins 2, 4, and 5 of the SIM card U10 are left floating.

[0067] In the above technical solution, the SIM card circuit is used for the network to authenticate the customer identity. Among them, the SIM card U9 is used to provide identity authentication for the module to access the network. The resistors R9, R10, and R11 limit the current for the communication signal between the SIM card and the MCU. The capacitors C16, C17, and C18 filter the communication signal between the SIM card and the MCU. The capacitor C4 filters the power supply input to the SIM card.

[0068] Among them, the second end of the capacitor C4 is connected to the 8th pin of the SIM card U10 and the 15th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit; the second end of the resistor R11 is connected to the 14th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit; the second end of the resistor R10 is connected to the 13th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit; the second end of the resistor R9 is connected to the 12th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit;

[0069] The model of the SIM card is a surface-mounted SIM card. The values of the resistor R9, resistor R10, resistor R11, capacitor C16, capacitor C17, capacitor C18, and capacitor C4 are 22R, 22R, 22R, 33pF, 33pF, 33pF, and 100nF respectively.

[0070] See Figure 8 As shown, the signal level conversion circuit includes a resistor R4 and a resistor R1. Among them, one end of the resistor R4 is connected to the MCU circuit, and the second end of the resistor R4 is connected to the NB_IoT wireless communication circuit; one end of the resistor R1 is connected to the MCU circuit, and the second end of the resistor R1 is connected to one end of the resistor R2 and the NB_IoT wireless communication circuit together; the second end of the resistor R2 is grounded.

[0071] In the above technical solution, the signal level conversion circuit is used to convert the serial port level voltage of the microcontroller U3 and the wireless communication module U9 module into an appropriate level voltage. Among them, the resistor R4 limits the current of the signal between the MCU and the NB-IoT module. The voltage dividing circuit composed of R1 and R2 limits the current and divides the voltage of the signal between the MCU and the NB-IoT module.

[0072] Among them, one end of the resistor R4 is connected to the 33rd pin of the microcontroller U3 of the MCU circuit, and the second end of the resistor R4 is connected to the 14th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit; one end of the resistor R1 is connected to the 32nd pin of the microcontroller U3 of the MCU circuit, and the second end of the resistor R1 is connected to one end of the resistor R2 and the 10th pin of the wireless communication module U9 of the NB_IoT wireless communication circuit together;

[0073] The values of the resistor R4 and the resistor R1 are 1K and 1K respectively.

[0074] See Figure 9As shown in the figure, the valve drive circuit includes a valve drive chip U5, a connector FA, a resistor R14, and a resistor R15. Among them, pin 1 of the valve drive chip U5 is connected to one end of a capacitor C21, and the second end of the capacitor C21 is grounded; pins 2 and 3 of the valve drive chip U5 are respectively connected to pins 1 and 2 of the connector FA; pin 5 of the valve drive chip U5 is connected to one end of the resistor R15 and pin 19 of the microcontroller U3 in the MCU circuit; pin 6 of the valve drive chip U5 is connected to one end of the resistor R14 and the MCU circuit; pin 8 of the valve drive chip U5 is connected to the second end of the resistor R14, the second end of the resistor R15, and the battery VCC; pin 7 of the valve drive chip U5 is connected to the MCU circuit; pins 9 and 4 of the valve drive chip U5 are both grounded.

[0075] In the above technical solution, the valve drive circuit is used to close and open the valve; the valve drive chip U5 is a MOS type switch chip, which amplifies the voltage signals of pins 6 and 7 and outputs them from pins 2 and 3, so as to drive the valve motor to close and open the valve; the resistors R14 and R15 are level pull-up resistors to prevent abnormal switching of the valve when there is no signal or floating input. The capacitor C21 filters the power supply input to the valve drive chip U5 to obtain a cleaner power supply.

[0076] Among them, pin 5 of the valve drive chip U5 is connected to one end of the resistor R15 and pin 19 of the microcontroller U3 in the MCU circuit; pin 6 of the valve drive chip U5 is connected to one end of the resistor R14 and pin 18 of the microcontroller U3 in the MCU circuit; pin 7 of the valve drive chip U5 is connected to pin 17 of the microcontroller U3 in the MCU circuit;

[0077] The models of the valve drive chip U5 and the connector FA are SS8837T and 2564-2A respectively.

[0078] The values of the resistor R14 and the resistor R15 are 2M and 2M respectively, and the capacitance value of the capacitor C21 is 4.7Uf.

[0079] See Figure 10As shown in the figure, the combustible gas detection circuit includes a combustible gas sensor U7, an arithmetic unit chip U6, a capacitor C6, a capacitor C5, a capacitor C7, a resistor R8, a resistor R6, and a resistor R7. Among them, pin 4, pin 6, and pin 2 of the combustible gas sensor U7 are commonly connected to one end of the capacitor C6, the positive electrode of the capacitor C5, one end of the variable resistor R7, pin 8 of the arithmetic unit chip U6, and the detection power supply circuit. Pin 5 of the combustible gas sensor U7 is connected to one end of the resistor R8. The second end of the resistor R8 is commonly connected to the second end of the capacitor C6, the negative electrode of the capacitor C5, the second end of the variable resistor R7, one end of the capacitor C7, and pin 4 of the arithmetic unit chip U6. The second end of the capacitor C7 is commonly connected to pin 1 of the arithmetic unit chip U6 and the MCU circuit. Pin 1 of the combustible gas sensor U7 is connected to one end of the resistor R6. The second end of the resistor R6 is grounded. Pin 3 of the combustible gas sensor U7 is connected to pin 2 of the arithmetic unit chip U6. The sliding end of the variable resistor is connected to pin 3 of the arithmetic unit chip U6.

[0080] In the above technical solution, the combustible gas detection circuit is used to detect the content of combustible gas in the air. Among them, the combustible gas sensor U7 amplifies the collected concentration analog quantity through the amplifier chip U6. The resistor R8 limits the current of the sensor U7, and the resistor R7 limits the current of the sensor output signal. The capacitors C5 and C6 filter the power supply of the sensor. The capacitor C7 filters the output signal of the amplifier U6. The variable resistor R7 provides a reference voltage for the amplifier U6.

[0081] Among them, the second end of the capacitor C7 is commonly connected to pin 1 of the arithmetic unit chip U6 and pin 4 of the microcontroller U3 of the MCU circuit.

[0082] The models of the combustible gas sensor U7 and the arithmetic unit chip U6 are MQ-9 and LM393 respectively. The values of the capacitors C6, C5, C7, the resistors R8, R6, and R7 are 100 nF, 10 μF, 100 nF, 0 Ω, 1 kΩ, and 5 kΩ respectively.

[0083] See Figure 11 As shown in the figure, the data storage circuit includes a storage chip U11, a resistor R17, and a resistor R18. Among them, pin 1, pin 2, pin 3, pin 4, and pin 7 of the storage chip U11 are all grounded. Pin 8 of the storage chip U11 is commonly connected to one end of the resistor R17, one end of the resistor R18, and the MCU circuit. Pin 6 of the storage chip U11 is commonly connected to the second end of the resistor R17 and the MCU circuit. Pin 5 of the storage chip U11 is commonly connected to the second end of the resistor R18 and the MCU circuit.

[0084] In the above technical solution, the data storage circuit is used to record and store the collected system status data. Among them, the data storage chip U11 is used to store the collected concentration status data. The storage chip signal terminals of resistor R17 and resistor R18 provide a pull-up power supply to make the communication process more anti-interference.

[0085] Among them, pin 8 of the storage chip U11 is commonly connected to one end of resistor R17, one end of resistor R18, and pin 46 of the microcontroller U3 in the MCU circuit; pin 6 of the storage chip U11 is commonly connected to the second end of resistor R17 and pin 45 of the microcontroller U3 in the MCU circuit; pin 5 of the storage chip U11 is commonly connected to the second end of resistor R18 and pin 44 of the microcontroller U3 in the MCU circuit.

[0086] The signal of the storage chip U11 is AT24C1024. The values of resistor R17 and resistor R18 are 10K and 10K respectively.

[0087] See Figure 12 As shown, the acoustic-optic alarm circuit includes transistor Q2, buzzer BUZZER1, LED1, resistor R3, and resistor R5. Among them, the emitter of transistor Q2 is connected to the battery VCC, the base of transistor Q2 is connected to one end of resistor R3, the second end of resistor R3 is connected to the MCU circuit, the collector of transistor Q2 is commonly connected to one end of resistor R5 and the positive pole of buzzer BUZZER1, the second end of resistor R5 is connected to the positive pole of LED1, and the negative poles of LED1 and buzzer BUZZER1 are both grounded.

[0088] In the above technical solution, the acoustic-optic alarm circuit is used to emit acoustic-optic reminders and warn users after detecting gas leakage. Among them, transistor Q2 amplifies the input control signal and drives the buzzer and LED lamp to achieve acoustic-optic alarm. Resistor R3 is a current-limiting resistor for the input signal. Resistor R5 is used to limit the current of the LED lamp.

[0089] Among them, the second end of resistor R3 is connected to pin 5 of the microcontroller U3 in the MCU circuit.

[0090] The models of transistor Q2, buzzer BUZZER1, and LED1 are S8550, SUN-12095-5VPA7.6, and SMD-3528 respectively. The values of resistor R3 and resistor R5 are 1K and 1K respectively.

[0091] See Figure 13 As shown, the ADC detection circuit includes resistor R12, resistor R13, and capacitor C20. Among them, one end of resistor R12 is connected to the battery VCC, the second end of resistor R12 is commonly connected to one end of resistor R13, one end of capacitor C20, and the MCU circuit; the second ends of resistor R13 and capacitor C20 are connected and grounded.

[0092] In the above technical solution, the ADC detection circuit is used to monitor the voltage of the power supply battery. Among them, resistor R12 and resistor R13 form a voltage dividing circuit to divide the input power supply. Capacitor C20 filters the voltage after voltage division.

[0093] Among them, the second end of resistor R12 is commonly connected to one end of resistor R13, one end of capacitor C20, and pin 60 of the microcontroller U3 of the MCU circuit;

[0094] The values of resistor R12, resistor R13, and capacitor C20 are 2M, 2M, and 1nF respectively.

[0095] See Figure 14 As shown, the key input circuit includes key S2, resistor R16, and capacitor C22. Among them, one end of resistor R16 is connected to the battery VCC, and the second end of resistor R16 is commonly connected to one end of capacitor C22, one end of key S2, and the MCU circuit; the second end of capacitor C22 is connected to the second end of key S2 and grounded.

[0096] In the above technical solution, the key input circuit is used to upload the collected data by pressing the key. Among them, resistor R16 limits the current for the key input circuit, and a level signal will be output after key S2 is pressed. Capacitor C22 filters and debounces the output level signal.

[0097] The second end of resistor R16 is commonly connected to one end of capacitor C22, one end of key S2, and pin 40 of the microcontroller U3 of the MCU circuit;

[0098] The model of key S2 is TS665CJ. The values of resistor R16 and capacitor C22 are 300K and 100nF respectively.

Claims

1. A remote gas leak cut-off system, characterized in that: It includes a wireless communication power supply, a detection circuit power supply, a system power supply, a key input circuit, an ADC detection circuit, a valve drive circuit and an audible and visual alarm circuit which are respectively connected to the battery; The wireless communication power supply is connected to a NB_IoT wireless communication circuit, and the NB_IoT wireless communication circuit is connected to a SIM card circuit and a level conversion circuit; the detection circuit power supply is connected to a combustible gas detection circuit; The system power supply is connected to an MCU circuit, and the MCU circuit is respectively connected to a key input circuit, an ADC detection circuit, a valve drive circuit, an audible and visual alarm circuit, a system power supply, a combustible gas detection circuit, a wireless communication power supply, a detection circuit power supply and a level conversion circuit; the MCU circuit is also connected to a data storage circuit.

2. The remote gas leak cut-off system according to claim 1, characterized in that: The system power supply includes a voltage stabilizing module U2, a capacitor C23 and a capacitor C2, wherein pin 1 of the voltage stabilizing module U2 is grounded, pin 2 of the voltage stabilizing module U2 is connected to the battery VCC, pin 3 of the voltage stabilizing module U2 is connected to one end of the capacitor C23, one end of the capacitor C24 and the MCU circuit, and the second end of the capacitor C23 and the second end of the capacitor C24 are connected and grounded.

3. The remote gas leak cut-off system according to claim 1, characterized in that: The wireless communication power supply includes a voltage stabilizing module U8, a capacitor C11, a capacitor C9, a capacitor C12 and a capacitor C10, wherein pin 5 of the voltage stabilizing module U8 is connected to the positive electrode of the capacitor C11, one end of the capacitor C9 and the NB_IoT wireless communication circuit, and the negative electrode of the capacitor C11 and the second end of the capacitor C9 are both grounded; pin 4 of the voltage stabilizing module U8 is connected to the positive electrode of the capacitor C12, one end of the capacitor C10 and the battery VCC, and the negative electrode of the capacitor C12 and the second end of the capacitor C10 are both grounded; pin 5 of the voltage stabilizing module U8 is grounded to the positive electrode of the capacitor C11, one end of the capacitor C9, the positive electrode of the capacitor C12 and the capacitor C10; pin 3 of the voltage stabilizing module U8 is connected to the MCU circuit.

4. The remote gas leak cut-off system according to claim 1, characterized in that: The detection circuit power supply includes a voltage stabilizing module U12, a capacitor C2, a capacitor C8, a capacitor C1 and a capacitor C3, wherein pin 4 of the voltage stabilizing module U12 is connected to the positive electrode of the capacitor C1, one end of the capacitor C3 and the battery VCC; pin 5 of the voltage stabilizing module U12 is connected to the positive electrode of the capacitor C2, one end of the capacitor C8 and the combustible gas detection circuit; the negative electrode of the capacitor C2, the second end of the capacitor C8, the negative electrode of the capacitor C1 and the second end of the capacitor C3 are grounded; pin 3 of the voltage stabilizing module U12 is connected to the MCU circuit, and pin 3 of the voltage stabilizing module U12 is grounded.

5. The remote gas leak cut-off system according to claim 1, characterized in that: The NB_IoT wireless communication circuit includes a wireless communication module U9, an antenna base ANT1, a capacitor C19, a capacitor C15, a capacitor C14 and a capacitor C13, wherein pins 31 and 32 of the wireless communication module U9 are connected to one end of capacitor C15, one end of capacitor C14, one end of capacitor C13 and a wireless communication power supply, and the second end of capacitor C15 is connected to the second end of capacitor C14 and the second end of capacitor C13 and is grounded; pin 20 of the wireless communication module U9 is connected to one end of capacitor C19, and the second end of capacitor C19 is grounded; pin 1 of the antenna base ANT1 is connected to pin 27 of the wireless communication module U9, and pin 2 of the antenna base ANT1 is connected to pin 30, pin 29, pin 28, pin 26, pin 25, pin 23 and pin 22 of the wireless communication module U9 and is grounded.

6. The remote gas leak cut-off system according to claim 1, characterized in that: The SIM card circuit includes a SIM card U10, a resistor R9, a resistor R10, a resistor R11, a capacitor C16, a capacitor C17, a capacitor C18 and a capacitor C4, wherein pin 1 of the SIM card U10 is connected to one end of the capacitor C4 and is grounded, and the second end of the capacitor C4 is connected to pin 8 of the SIM card U10 and the NB_IoT wireless communication circuit; pin 3 of the SIM card U10 is commonly connected to one end of the resistor R11 and one end of the capacitor C16, and the second end of the resistor R11 is connected to the NB_IoT wireless communication circuit; pin 6 of the SIM card U10 is commonly connected to one end of the resistor R10 and one end of the capacitor C17, and the second end of the resistor R10 is connected to the NB_IoT wireless communication circuit; pin 7 of the SIM card U10 is commonly connected to one end of the resistor R9 and one end of the capacitor C18, and the second end of the resistor R9 is connected to the NB_IoT wireless communication circuit; the second end of the capacitor C16, the second end of the capacitor C17 and the capacitor C18 are commonly grounded; pins 2, 4 and 5 of the SIM card U10 are suspended.

7. The remote gas leak cut-off system according to claim 1, characterized in that: The level conversion circuit includes a resistor R4 and a resistor R1, wherein one end of the resistor R4 is connected to the MCU circuit, and the second end of the resistor R4 is connected to the NB_IoT wireless communication circuit; one end of the resistor R1 is connected to the MCU circuit, and the second end of the resistor R1 is connected to one end of the resistor R2 and the NB_IoT wireless communication circuit; the second end of the resistor R2 is grounded.

8. The remote gas leak cut-off system according to claim 1, characterized in that: The valve drive circuit includes a valve drive chip U5, a connection socket FA, a resistor R14 and a resistor R15, wherein pin 1 of the valve drive chip U5 is connected to one end of a capacitor C21, and the second end of the capacitor C21 is grounded; pins 2 and 3 of the valve drive chip U5 are respectively connected to pins 1 and 2 of the connection socket FA; pin 5 of the valve drive chip U5 is connected to one end of the resistor R15 and the MCU circuit and pin 19 of the microcontroller U3; pin 6 of the valve drive chip U5 is connected to one end of the resistor R14 and the MCU circuit, and pin 8 of the valve drive chip U5 is connected to the second end of the resistor R14, the second end of the resistor R15 and the battery VCC; pin 7 of the valve drive chip U5 is connected to the MCU circuit; pins 9 and 4 of the valve drive chip U5 are both grounded.

9. The remote gas leak cut-off system according to claim 1, characterized in that: The combustible gas detection circuit includes a combustible gas sensor U7, an operator chip U6, a capacitor C6, a capacitor C5, a capacitor C7, a resistor R8, a resistor R6 and a resistor R7, wherein pins 4, 6 and 2 of the combustible gas sensor U7 are connected to one end of the capacitor C6, the positive electrode of the capacitor C5, one end of the variable resistor R7, pin 8 of the operator chip U6 and a detection circuit power supply; pin 5 of the combustible gas sensor U7 is connected to one end of the resistor R8, the second end of the resistor R8 is connected to the second end of the capacitor C6, the negative electrode of the capacitor C5, the second end of the variable resistor R7, one end of the capacitor C7 and pin 4 of the operator chip U6; the second end of the capacitor C7 is connected to pin 1 of the operator chip U6 and the MCU circuit; pin 1 of the combustible gas sensor U7 is connected to one end of the resistor R6, and the second end of the resistor R6 is grounded; pin 3 of the combustible gas sensor U7 is connected to pin 2 of the operator chip U6; and the sliding end of the variable resistor is connected to pin 3 of the operator chip U6.

10. The remote gas leak cut-off system according to claim 1, characterized in that: The data storage circuit includes a storage chip U11, a resistor R17 and a resistor R18, wherein pins 1, 2, 3, 4 and 7 of the storage chip U11 are all grounded; pin 8 of the storage chip U11 is connected to one end of the resistor R17, one end of the resistor R18 and the MCU circuit; pin 6 of the storage chip U11 is connected to the second end of the resistor R17 and the MCU circuit; and pin 5 of the storage chip U11 is connected to the second end of the resistor R18 and the MCU circuit.

11. The remote gas leak cut-off system according to claim 1, characterized in that: The sound and light alarm circuit includes a transistor Q2, a buzzer BUZZER1, an LED1, a resistor R3 and a resistor R5, wherein the emitter of the transistor Q2 is connected to a battery VCC, the base of the transistor Q2 is connected to one end of the resistor R3, the second end of the resistor R3 is connected to an MCU circuit, the collector of the transistor Q2 is connected to one end of the resistor R5 and the positive electrode of the buzzer BUZZER1, the second end of the resistor R5 is connected to the positive electrode of the LED1, and the negative electrode of the LED1 and the negative electrode of the buzzer BUZZER1 are both grounded.

12. The remote gas leak cut-off system according to claim 1, characterized in that: The ADC detection circuit includes a resistor R12, a resistor R13 and a capacitor C20, wherein one end of the resistor R12 is connected to the battery VCC, and the second end of the resistor R12 is connected to one end of the resistor R13, one end of the capacitor C20 and the MCU circuit; the second end of the resistor R13 is connected to the second end of the capacitor C20 and is grounded.

13. The remote gas leak cut-off system according to claim 1, characterized in that: The key input circuit includes a key S2, a resistor R16 and a capacitor C22, wherein one end of the resistor R16 is connected to the battery VCC, and the second end of the resistor R16 is connected to one end of the capacitor C22, one end of the key S2 and the MCU circuit; the second end of the capacitor C22 is connected to the second end of the key S2 and is grounded.

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