Gas detector with wireless shut-off valve

Abstract

The utility model discloses a gas detector with wireless valve, which comprises a face shell, a bottom shell connected with the face shell through buckling, a PCB board arranged between the face shell and the bottom shell, a button arranged on the PCB board, and an output line arranged at one end of the bottom shell. The PCB board is provided with a main control circuit, a power supply circuit, a gas detection circuit, an RF433 transmitting circuit, a buzzer circuit, an electromagnetic valve circuit, a gas meter circuit, an indicator lamp circuit, a gas detection power supply circuit, a main control power supply circuit, a temperature detection circuit, an NB module interface circuit, and an NB module interface power supply circuit. The main control circuit is electrically connected with the power supply circuit, the gas detection circuit, the RF433 transmitting circuit, the buzzer circuit, the electromagnetic valve circuit, the gas meter circuit, the indicator lamp circuit, the gas detection power supply circuit, the main control power supply circuit, the temperature detection circuit, the NB module interface circuit, the NB module interface power supply circuit, and the button. The power supply circuit is used for supplying power to the buzzer circuit, the electromagnetic valve circuit, the gas meter circuit, the NB module interface power supply circuit, the main control power supply circuit, and the gas detection power supply circuit.

Description

Technical Field

[0001] This utility model relates to gas detectors, and more particularly to a gas detector with a wireless valve shut-off function. Background Technology

[0002] With the acceleration of urbanization, the use of natural gas in homes and industries is becoming increasingly widespread. As a highly efficient energy source, the safety of natural gas is paramount. However, gas leaks occur frequently, posing a serious threat to people's lives and property. While traditional gas detectors can detect flammable gas leaks and issue alarms, they have some limitations in practical use: Limited alarm methods: Traditional detectors typically only use a local buzzer to sound an alarm, making it difficult for users to detect the alarm in time when they are far away from the detector.

[0003] Lack of automatic shut-off function: When a leak is detected, the gas supply cannot be automatically shut off, requiring manual intervention, which increases safety hazards.

[0004] Data recording and tracing difficulties: Traditional detectors lack effective data recording and output functions, making it difficult to trace and analyze historical data.

[0005] Insufficient remote monitoring and management: Remote monitoring and management cannot be achieved through the network, and users cannot keep track of equipment status and gas usage in real time.

[0006] Insufficient temperature compensation: Gas detection accuracy may be affected under different ambient temperatures, leading to false alarms or missed alarms. Utility Model Content

[0007] In view of the problems existing in the prior art, this utility model provides a gas detector with wireless valve shut-off.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows: This utility model provides a gas detector with wireless valve shut-off, including: a front shell, a bottom shell connected to the front shell by a snap-fit, a PCB board disposed between the front shell and the bottom shell, a button disposed on the PCB board, and an output line disposed at one end of the bottom shell. The PCB board is equipped with a main control circuit, a power supply circuit, a gas detection circuit, an RF433 transmitter circuit, a buzzer circuit, a solenoid valve circuit, a gas meter circuit, an indicator light circuit, a gas detection power supply circuit, a main control power supply circuit, a temperature detection circuit, an NB module interface circuit, and an NB module interface power supply circuit. The corresponding terminals of the main control circuit are respectively electrically connected to the power supply circuit, gas detection circuit, RF433 transmitting circuit, buzzer circuit, solenoid valve circuit, gas meter circuit, indicator light circuit, gas detection power supply circuit, main control power supply circuit, temperature detection circuit, NB module interface circuit, NB module interface power supply circuit, and the corresponding terminals of the buttons. The power supply circuit is used to supply power to the buzzer circuit, solenoid valve circuit, gas meter circuit, NB module interface power supply circuit, main control power supply circuit, and gas detection power supply circuit. The main control power supply circuit is used to supply power to the main control circuit, indicator light circuit, and temperature detection circuit; the gas detection power supply circuit is used to supply power to the gas detection circuit; and the NB module interface power supply circuit is used to supply power to the NB module interface circuit.

[0009] Preferably, the front cover has a button mounting port and several honeycomb openings; one end of the button passes through the button mounting port; the bottom of the front cover has several slots, and correspondingly, the bottom cover has buckles that fit the slots; one end of the bottom cover has a notch, and the head of the output cable is placed at the notch.

[0010] Preferably, the main control circuit includes an MCU, the model of which is CX32L003F8P6.

[0011] Preferably, the power supply circuit is used to output 12V and 5V voltages to power the circuit, wherein the 12V voltage is used to power the buzzer circuit, solenoid valve circuit, gas meter circuit, and NB module interface power supply circuit, and the 5V voltage is used to power the main control power supply circuit and the gas detection power supply circuit.

[0012] Preferably, the power supply circuit includes an AC220V input terminal, a rectifier bridge circuit, a switching power supply control circuit, a transformer circuit, and an optocoupler circuit; the corresponding terminals of the rectifier bridge circuit are electrically connected to the corresponding terminals of the AC220V input terminal, the switching power supply control circuit, and the transformer circuit, respectively; the corresponding terminals of the transformer circuit are electrically connected to the corresponding terminals of the switching power supply control circuit and the optocoupler circuit, respectively; and the corresponding terminals of the switching power supply control circuit are also electrically connected to the corresponding terminals of the optocoupler circuit, respectively.

[0013] The switching power supply control circuit includes a switching power supply chip DK106 and its peripheral circuits, and the optocoupler circuit includes an optocoupler chip PC817 and its peripheral circuits.

[0014] Preferably, the transformer circuit includes a transformer T1, an inductor L1, an inductor L2, a diode D10, a diode D4, a transistor Q5, a resistor R2, and capacitors C1, C4, C2, C3, C5, and C6. The first terminal of inductor L1 is electrically connected to the first terminal of capacitor C5 and the corresponding terminal of the rectifier bridge circuit. The second terminal of inductor L1 is electrically connected to the first terminals of capacitors C6 and C3, the first terminal of resistor R2, and the first pin of transformer T1. The second terminal of capacitor C5 is electrically connected to the rectifier bridge circuit, the second terminal of capacitor C6, and the corresponding terminal of switching power supply chip DK106. The second pin of transformer T1 is electrically connected to the second terminal of resistor R2 and the second terminal of capacitor C3 via diode D4. The third pin of the transformer T1 is electrically connected to the first end of the resistor R6 and the first end of the diode D10 via the diode D10. The second end of the resistor R6 is electrically connected to the corresponding end of the MCU via the transistor Q5. The second end of the diode D1 is electrically connected to the 12V power supply terminal, the capacitor C1, and the first end of the resistor R1. The fourth pin of the transformer T1 is electrically connected to the first terminal of the capacitor C2, the corresponding terminal of the optocoupler chip PC817, and the first terminal of the inductor L2 via the diode D3. The second terminal of the inductor L2 is electrically connected to the 5V power supply terminal, the corresponding terminal of the optocoupler chip PC817, and the first terminal of the capacitor C4. The fifth pin of the transformer T1 is electrically connected to the second terminal of capacitor C4, the second terminal of capacitor C1, and the second terminal of resistor R1, respectively.

[0015] Preferably, the main control power supply circuit includes a voltage regulator chip U6 and its peripheral circuits. The voltage regulator chip U6 is used to regulate the 5V voltage input from the power supply circuit to 3.3V to supply power to the MCU. The model of the voltage regulator chip U6 is SD5333-3.3V.

[0016] Preferably, the gas detection circuit includes a combustible gas sensor, and the corresponding terminal of the combustible gas sensor is electrically connected to the corresponding terminal of the MCU; the gas detection power supply circuit includes a voltage regulator chip MT3410LB-N and its peripheral circuit, and the corresponding terminals of the voltage regulator chip MT3410LB-N are electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

[0017] Preferably, the NB module interface power supply circuit includes a step-down chip STI3472 and its peripheral circuits. The corresponding terminals of the step-down chip STI3472 are electrically connected to the corresponding terminals of the power supply circuit, the MCU, and the NB module interface circuit, respectively, and are used to step down the 12V voltage input from the power supply circuit to 3.8V to power the NB module interface circuit.

[0018] Preferably, the PCB board is further provided with a program download circuit, a historical record output circuit, and an RTC clock circuit, and the corresponding terminals of the program download circuit, the historical record output circuit, and the RTC clock circuit are electrically connected to the corresponding terminals of the MCU.

[0019] The technical solution of this utility model has the following beneficial effects: Combining local and remote alarms: Local audible and visual alarms are achieved through buzzer and indicator light circuits, while the alarm signal is wirelessly transmitted to external devices, such as the user's mobile phone or alarm host, using the RF433 transmitting circuit. Even if the user is not on-site, they can receive alarm information in a timely manner, which significantly improves the timeliness and reliability of the alarm.

[0020] Multiple notification methods: After receiving an alarm signal, the external device can notify the user through SMS, APP push and other methods to ensure that the user can take measures as soon as possible to prevent the accident from escalating.

[0021] Automatic gas supply cut-off Quick shut-off function: When a gas leak is detected, the main control circuit quickly controls the solenoid valve circuit to cut off the gas supply, effectively preventing further gas leakage, reducing the risk of accidents such as fire and explosion, and protecting the safety of users' lives and property.

[0022] Automatic recovery function: After confirming safety, users can restore gas supply through manual operation or remote command, which is simple to operate and improves the ease of use of the equipment.

[0023] Detailed data recording: Through the historical record output circuit, the device can record key information such as gas detection data, alarm records, and user operation records, and can output the data to external storage devices or transmit it to display devices such as computers, making it convenient for users to trace and analyze the data.

[0024] Remote monitoring and management functions: Through the NB module interface circuit, the device can upload operating data to a cloud server or management platform in real time. Users can check the device status and gas usage anytime, anywhere via mobile phone or computer, achieving remote monitoring. Simultaneously, users can send control commands to the device through the management platform, such as remotely setting alarm thresholds and remotely resetting, improving the device's intelligence level and management efficiency, and meeting the needs of modern households and industries for intelligent equipment.

[0025] Temperature compensation function: The temperature detection circuit monitors the ambient temperature in real time and transmits the data to the main control circuit. The main control circuit compensates for the gas detection results based on the temperature data to ensure the accuracy of the detection results under different ambient temperatures and reduce false alarms and missed alarms.

[0026] High-sensitivity gas detection and temperature compensation: Employing a high-sensitivity combustible gas sensor, it can quickly and accurately detect low-concentration combustible gas leaks. Combined with a temperature detection circuit for temperature compensation, it ensures the accuracy of detection results under different ambient temperatures, reduces false alarms and missed alarms, and improves the equipment's ability and reliability in monitoring gas leaks. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the present utility model. Figure 3 ; Figure 4 This is an exploded view of the structure of this utility model; Figure 5 This is a block diagram of the control circuit of this utility model; Figure 6 This is a circuit diagram of the control circuit of this utility model; Figure 7 This is the circuit diagram of the solenoid valve circuit of this utility model; Figure 8 This is the circuit diagram of the gas meter circuit of this utility model; Figure 9 This is the circuit diagram of the buzzer circuit of this utility model; Figure 10 This is the circuit diagram of the indicator light circuit of this utility model; Figure 11 This is a circuit diagram of the gas detection circuit of this utility model; Figure 12 This is the circuit schematic diagram of the RF433 transmitting circuit of this utility model; Figure 13 This is a circuit diagram of the temperature detection circuit of this utility model; Figure 14 This is the circuit diagram of the power supply circuit of this utility model; Figure 15 The circuit diagram of the main control power supply circuit of this utility model; Figure 16 This is a circuit diagram of the NB module interface circuit of this utility model; Figure 17 The circuit diagram of the power supply circuit for the NB module interface of this utility model; Figure 18 This is a circuit diagram of the program download circuit of this utility model; Figure 19 This is a circuit diagram of the historical record output circuit of this utility model; Figure 20 This is the circuit schematic diagram of the RTC clock circuit of this utility model. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Reference Figures 1 to 20This utility model provides a gas detector with wireless valve shut-off, including: a front shell 1, a bottom shell 5 connected to the front shell 1 by a snap-fit, a PCB board 4 disposed between the front shell 1 and the bottom shell 5, a button 2 disposed on the PCB board 4, and an output line 3 disposed at one end of the bottom shell 5. The PCB board 4 is equipped with a main control circuit 10, a power supply circuit 90, a gas detection circuit 60, an RF433 transmitting circuit 70, a buzzer circuit 40, a solenoid valve circuit 20, a gas meter circuit 30, an indicator light circuit 50, a gas detection power supply circuit 160, a main control power supply circuit 100, a temperature detection circuit 80, an NB module interface circuit 110, and an NB module interface power supply circuit 120. The corresponding terminals of the main control circuit 10 are respectively electrically connected to the power supply circuit 90, gas detection circuit 60, RF433 transmitting circuit 70, buzzer circuit 40, solenoid valve circuit 20, gas meter circuit 30, indicator light circuit 50, gas detection power supply circuit 160, main control power supply circuit 100, temperature detection circuit 80, NB module interface circuit 110, NB module interface power supply circuit 120, and the corresponding terminals of button 2. The power supply circuit 90 is used to supply power to the buzzer circuit 40, the solenoid valve circuit 20, the gas meter circuit 30, the NB module interface power supply circuit 120, the main control power supply circuit 100, and the gas detection power supply circuit 160. The main control power supply circuit 100 is used to supply power to the main control circuit 10, the indicator circuit 50, and the temperature detection circuit 80; the gas detection power supply circuit 160 is used to supply power to the gas detection circuit 60; and the NB module interface power supply circuit 120 is used to supply power to the NB module interface circuit 110.

[0034] Furthermore, the faceplate has a button mounting port and several honeycomb openings, which are used for gas flow so that combustible gas can smoothly enter the gas detection circuit 60 for detection; one end of the button passes through the button mounting port; the bottom of the faceplate has several slots, and correspondingly, the bottom shell has buckles that fit the slots, which are used for connection and easy disassembly and installation; one end of the bottom shell has a notch, and the head of the output line is placed at the notch.

[0035] Reference Figures 5 to 20The main control circuit includes an MCU (Microcontroller Unit), model CX32L003F8P6. As the core of the main control circuit, the CX32L003F8P6 integrates multiple functions and serves as the control center of the entire gas detector. When the gas detection circuit detects that the concentration of combustible gas exceeds a set threshold, the MCU receives this signal and determines, through its internal program, whether to trigger an alarm, close the solenoid valve, or perform other operations. Simultaneously, the MCU can control the RF433 transmitter circuit to send alarm information to external devices, enabling remote alarm functionality. The MCU can make a comprehensive judgment based on the concentration data provided by the gas detection circuit 60 and the temperature information provided by the temperature detection circuit 80. If a slight increase in gas concentration is detected in a high-temperature environment but does not exceed the safety threshold, the MCU can determine it as normal, avoiding false alarms; if the concentration continues to rise and exceeds the threshold, an alarm and safety measures will be triggered immediately. The MCU is responsible for controlling communication with external devices, including wireless and wired communication. Through the NB module interface circuit 110, the MCU can communicate with the NB-IoT network, uploading detected data to a cloud server for remote monitoring and management. Meanwhile, the MCU can also communicate with the wireless receiving device through the RF433 transmitting circuit 70 to send alarm information in a timely manner.

[0036] Furthermore, the power supply circuit 90 is used to output 12V and 5V voltages to power the circuit. The 12V voltage is used to power the buzzer circuit 40, the solenoid valve circuit 20, the gas meter circuit 30, and the NB module interface power supply circuit 120. The 5V voltage is used to power the main control power supply circuit 100 and the gas detection power supply circuit 160.

[0037] The power supply circuit 90 includes an AC220V input terminal, a rectifier bridge circuit, a switching power supply control circuit 902, a transformer circuit 901, and an optocoupler circuit 903. Corresponding terminals of the rectifier bridge circuit are electrically connected to the corresponding terminals of the AC220V input terminal, the switching power supply control circuit 902, and the transformer circuit 901. Corresponding terminals of the transformer circuit 901 are electrically connected to the corresponding terminals of the switching power supply control circuit 902 and the optocoupler circuit 903. Corresponding terminals of the switching power supply control circuit 902 are also electrically connected to the corresponding terminals of the optocoupler circuit 902. The switching power supply control circuit 902 includes a switching power supply chip DK106 and its peripheral circuits, and the optocoupler circuit 903 includes an optocoupler chip PC817 and its peripheral circuits. The transformer circuit 901 includes a transformer T1, inductors L1 and L2, diodes D10 and D4, transistor Q5, resistor R2, and capacitors C1, C4, C2, C3, C5, and C6. The first terminal of inductor L1 is electrically connected to the first terminal of capacitor C5 and the corresponding terminal of the rectifier bridge circuit. The second terminal of inductor L1 is electrically connected to the first terminal of capacitor C6, the first terminal of capacitor C3, the first terminal of resistor R2, and the first pin of transformer T1. The second terminal of capacitor C5 is electrically connected to the rectifier bridge circuit, the second terminal of capacitor C6, and the corresponding terminal of the switching power supply chip DK106. The second pin of transformer T1 is electrically connected via diode D4 to the second terminal of resistor R2 and the second terminal of capacitor C3. The transformer T1's third pin is electrically connected to the first terminal of resistor R6 and the first terminal of diode D1 via diode D10. The second terminal of resistor R6 is electrically connected to the corresponding terminal of MCU via transistor Q5. The second terminal of diode D1 is electrically connected to the 12V power supply terminal, capacitor C1, and the first terminal of resistor R1. The transformer T1's fourth pin is electrically connected to the first terminal of capacitor C2, the corresponding terminal of optocoupler chip PC817, and the first terminal of inductor L2 via diode D3. The second terminal of inductor L2 is electrically connected to the 5V power supply terminal, the corresponding terminal of optocoupler chip PC817, and the first terminal of capacitor C4. The transformer T1's fifth pin is electrically connected to the second terminal of capacitor C4, the second terminal of capacitor C1, and the second terminal of resistor R1.

[0038] Furthermore, the main control power supply circuit 100 includes a voltage regulator chip U6 and its peripheral circuits. The voltage regulator chip U6 is used to regulate the 5V voltage input from the power supply circuit to 3.3V to supply power to the MCU. The model of the voltage regulator chip U6 is SD5333-3.3V.

[0039] Furthermore, the gas detection circuit 60 includes a combustible gas sensor, the corresponding terminal of which is electrically connected to the corresponding terminal of the MCU. The model of the combustible gas sensor is MQ-4B or NC (TGS2619-C00). The gas detection power supply circuit 160 includes a voltage regulator chip MT3410LB-N and its peripheral circuits. The corresponding terminals of the voltage regulator chip MT3410LB-N are electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

[0040] When the concentration of combustible gas in the environment changes, the combustible gas sensor in the gas detection circuit 60 detects this change and converts it into an electrical signal, which is then transmitted to the MCU. The MCU determines whether the gas concentration exceeds a set safety threshold based on the received signal, and thus decides whether to trigger an alarm and take appropriate safety measures.

[0041] The RF433 transmitter circuit 70 is used to wirelessly transmit alarm signals or other information generated by the MCU. When a combustible gas leak is detected, the MCU controls the RF433 transmitter circuit 70 to send the alarm information wirelessly to a wireless receiving device, such as an alarm host or mobile phone, so as to promptly notify users or relevant personnel to take measures, thereby improving the timeliness and reliability of gas leak alarms.

[0042] The buzzer circuit 40 is used to emit an alarm sound to alert users or relevant personnel. This circuit can control the buzzer to emit alarm sounds of different frequencies and patterns according to the MCU's instructions to adapt to different alarm situations. It can form an audible and visual alarm with the indicator light circuit 50. When the MCU detects a gas leak or other abnormal situation, it triggers the buzzer to emit a high-volume alarm sound, ensuring that users can hear the alarm signal in a timely manner even in noisy environments, thus attracting their attention and prompting them to take action.

[0043] The solenoid valve circuit 20 controls the opening and closing of the solenoid valve to cut off or restore the gas supply. This circuit receives control signals from the main control circuit 10 and drives the solenoid valve to ensure that the gas supply can be quickly cut off when a gas leak is detected, preventing further gas leakage. When the gas detection circuit 60 detects that the concentration of combustible gas exceeds the safety threshold, the solenoid valve circuit 20 quickly shuts off the solenoid valve to prevent further gas leakage, reduce the danger caused by gas leakage, and protect the life and property safety of users.

[0044] The gas meter circuit 30 is used to communicate and control the gas meter, enabling the monitoring and management of gas usage. It can acquire real-time gas meter readings to understand gas usage. Gas usage data is uploaded to a cloud server or management platform for remote monitoring and management by users and administrators.

[0045] When the gas meter malfunctions or becomes abnormal, it promptly sends a signal to the main control circuit 10 to trigger the alarm mechanism.

[0046] The indicator light circuit 50 is used to display the working status of the gas detector to the user via light signals. Intuitive display: Different colors and flashing patterns of the indicator lights clearly show the device's working status, such as normal operation, alarm, and fault. Multiple status indication modes can be set, such as solid green for normal operation, flashing red for alarm, and flashing yellow for fault. Low-power LED indicators are used to extend the device's lifespan.

[0047] The temperature detection circuit 80 is used to detect the ambient temperature, providing a temperature reference for the operation of the gas detector. Combined with data from the gas detection circuit 60, it performs temperature compensation on the detection results, improving detection accuracy and reducing false alarms. The temperature detection circuit 80 monitors the ambient temperature in real time. When the temperature is too high or too low, it sends a signal to the main control circuit 10 to trigger corresponding protection measures, ensuring that the equipment operates within a safe temperature range.

[0048] Temperature data can be uploaded to a cloud server or management platform to facilitate remote monitoring by users and administrators.

[0049] The NB module interface circuit 110 is used to connect the NB module, enabling communication between the gas detector and an external network. Through the NB-IoT network, it uploads data such as detected gas concentration, alarm information, and device status to a cloud server or management platform, achieving remote monitoring and management. Utilizing NB-IoT technology, it features low power consumption and wide coverage, making it suitable for devices operating for extended periods.

[0050] Furthermore, the NB module interface power supply circuit 120 includes a step-down chip STI3472 and its peripheral circuits. The corresponding terminals of the step-down chip STI3472 are electrically connected to the corresponding terminals of the power supply circuit 90, the MCU, and the NB module interface circuit 120, respectively, to step down the 12V voltage input from the power supply circuit to a 3.8V voltage to power the NB module interface circuit 110.

[0051] Furthermore, the PCB board also includes a program download circuit 130, a historical data output circuit 140, and an RTC clock circuit 150. The corresponding terminals of these circuits are electrically connected to the corresponding terminals of the MCU. The program download circuit 130 is used to download new program code into the MCU, enabling software updates and functional upgrades for the device. This circuit connects to an external programming device (such as a computer) to transmit programming data to the MCU, completing the program burning process. The historical data output circuit 140 is used to output historical data (such as gas detection records, alarm records, operation records, etc.) generated during device operation to an external storage device or display device. This circuit connects to the MCU, receives the historical data stored in the MCU, and converts it into a suitable output format.

[0052] Working principle of this utility model The gas detector monitors the concentration of combustible gas in the environment in real time through the gas detection circuit 60. Once the concentration exceeds the standard, the main control circuit (including the MCU) receives the signal and controls the buzzer circuit 40 to sound an alarm and the indicator light circuit 50 to flash a warning. At the same time, the main control circuit activates the RF433 transmitting circuit 70 to wirelessly transmit the alarm signal to external devices to notify the user. In addition, the main control circuit also controls the solenoid valve circuit 20 to cut off the gas supply to prevent the accident from escalating. The temperature detection circuit 80 monitors the ambient temperature in real time and provides temperature compensation data to the main control circuit to improve detection accuracy. The NB module interface circuit 110 uploads the device data to the cloud through the NB-IoT network to achieve remote monitoring.

[0053] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A gas detector with wireless valve shut-off, characterized in that, include: The front shell, the bottom shell connected to the front shell by a snap-fit ​​mechanism, the PCB board between the front shell and the bottom shell, the buttons on the PCB board, and the output line at one end of the bottom shell. The PCB board is equipped with a main control circuit, a power supply circuit, a gas detection circuit, an RF433 transmitter circuit, a buzzer circuit, a solenoid valve circuit, a gas meter circuit, an indicator light circuit, a gas detection power supply circuit, a main control power supply circuit, a temperature detection circuit, an NB module interface circuit, and an NB module interface power supply circuit. The corresponding terminals of the main control circuit are respectively electrically connected to the power supply circuit, gas detection circuit, RF433 transmitting circuit, buzzer circuit, solenoid valve circuit, gas meter circuit, indicator light circuit, gas detection power supply circuit, main control power supply circuit, temperature detection circuit, NB module interface circuit, NB module interface power supply circuit, and the corresponding terminals of the buttons. The power supply circuit is used to supply power to the buzzer circuit, solenoid valve circuit, gas meter circuit, NB module interface power supply circuit, main control power supply circuit, and gas detection power supply circuit. The main control power supply circuit is used to supply power to the main control circuit, indicator light circuit, and temperature detection circuit; the gas detection power supply circuit is used to supply power to the gas detection circuit; and the NB module interface power supply circuit is used to supply power to the NB module interface circuit.

2. The gas detector with wireless valve shut-off according to claim 1, characterized in that, The front cover has a button mounting port and several honeycomb openings; one end of the button passes through the button mounting port; the bottom of the front cover has several slots, and correspondingly, the bottom cover has buckles that fit the slots; one end of the bottom cover has a notch, and the head of the output cable is placed at the notch.

3. The gas detector with wireless valve shut-off according to claim 1, characterized in that, The main control circuit includes an MCU, model number CX32L003F8P6.

4. The gas detector with wireless valve shut-off according to claim 3, characterized in that, The power supply circuit is used to output 12V and 5V voltages to power the circuit. The 12V voltage is used to power the buzzer circuit, solenoid valve circuit, gas meter circuit, and NB module interface power supply circuit, while the 5V voltage is used to power the main control power supply circuit and the gas detection power supply circuit.

5. The gas detector with wireless valve shut-off according to claim 4, characterized in that, The power supply circuit includes an AC220V input terminal, a rectifier bridge circuit, a switching power supply control circuit, a transformer circuit, and an optocoupler circuit. Corresponding terminals of the rectifier bridge circuit are electrically connected to the corresponding terminals of the AC220V input terminal, the switching power supply control circuit, and the transformer circuit. Corresponding terminals of the transformer circuit are electrically connected to the corresponding terminals of the switching power supply control circuit and the optocoupler circuit. The corresponding terminals of the switching power supply control circuit are also electrically connected to the corresponding terminals of the optocoupler circuit. The switching power supply control circuit includes a switching power supply chip DK106 and its peripheral circuits, and the optocoupler circuit includes an optocoupler chip PC817 and its peripheral circuits.

6. The gas detector with wireless valve shut-off according to claim 5, characterized in that, The transformer circuit includes transformer T1, inductor L1, inductor L2, diode D10, diode D4, transistor Q5, resistor R2, capacitor C1, capacitor C4, capacitor C2, capacitor C3, capacitor C5, and capacitor C6. The first terminal of inductor L1 is electrically connected to the first terminal of capacitor C5 and the corresponding terminal of the rectifier bridge circuit. The second terminal of inductor L1 is electrically connected to the first terminals of capacitors C6 and C3, the first terminal of resistor R2, and the first pin of transformer T1. The second terminal of capacitor C5 is electrically connected to the rectifier bridge circuit, the second terminal of capacitor C6, and the corresponding terminal of switching power supply chip DK106. The second pin of transformer T1 is electrically connected to the second terminal of resistor R2 and the second terminal of capacitor C3 via diode D4. The third pin of the transformer T1 is electrically connected to the first end of the resistor R6 and the first end of the diode D10 via the diode D10. The second end of the resistor R6 is electrically connected to the corresponding end of the MCU via the transistor Q5. The second end of the diode D1 is electrically connected to the 12V power supply terminal, the capacitor C1, and the first end of the resistor R1. The fourth pin of the transformer T1 is electrically connected to the first terminal of the capacitor C2, the corresponding terminal of the optocoupler chip PC817, and the first terminal of the inductor L2 via the diode D3. The second terminal of the inductor L2 is electrically connected to the 5V power supply terminal, the corresponding terminal of the optocoupler chip PC817, and the first terminal of the capacitor C4. The fifth pin of the transformer T1 is electrically connected to the second terminal of capacitor C4, the second terminal of capacitor C1, and the second terminal of resistor R1, respectively.

7. The gas detector with wireless valve shut-off according to claim 4, characterized in that, The main control power supply circuit includes a voltage regulator chip U6 and its peripheral circuits. The voltage regulator chip U6 is used to regulate the 5V voltage input from the power supply circuit to 3.3V to supply power to the MCU. The model of the voltage regulator chip U6 is SD5333-3.3V.

8. The gas detector with wireless valve shut-off according to claim 4, characterized in that, The gas detection circuit includes a combustible gas sensor, and the corresponding terminal of the combustible gas sensor is electrically connected to the corresponding terminal of the MCU; the gas detection power supply circuit includes a voltage regulator chip MT3410LB-N and its peripheral circuits, and the corresponding terminals of the voltage regulator chip MT3410LB-N are electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

9. The gas detector with wireless valve shut-off according to claim 4, characterized in that, The NB module interface power supply circuit includes a step-down chip STI3472 and its peripheral circuits. The corresponding terminals of the step-down chip STI3472 are electrically connected to the corresponding terminals of the power supply circuit, MCU, and NB module interface circuit, respectively, and are used to step down the 12V voltage input from the power supply circuit to 3.8V to power the NB module interface circuit.

10. The gas detector with wireless valve shut-off according to claim 9, characterized in that, The PCB board is also equipped with a program download circuit, a historical record output circuit, and an RTC clock circuit. The corresponding terminals of the program download circuit, the historical record output circuit, and the RTC clock circuit are electrically connected to the corresponding terminals of the MCU.

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