A combustible gas detector

Abstract

This utility model discloses a combustible gas detector, comprising: a front shell, a bottom shell detachably connected to the front shell, a PCB board disposed between the front shell and the bottom shell, a battery cover disposed on the bottom shell, a mounting plate disposed at the bottom of the bottom shell, and an electromagnetic valve output line and a power output line disposed at one end of the front shell and 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, a electromagnetic valve circuit, a gas meter circuit, an indicator light circuit, a WIFI module, a button circuit, a main control power supply circuit, and a gas detection power supply circuit; the corresponding terminals of the main control circuit are electrically connected to the corresponding terminals of 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 light circuit, the WIFI module, the button circuit, the main control power supply circuit, and the gas detection power supply circuit, respectively.

Description

Technical Field

[0001] This utility model relates to the field of detector technology, and in particular to a combustible gas detector. Background Technology

[0002] With the acceleration of urbanization, the use of natural gas in homes and industries is becoming increasingly widespread. However, gas leaks occur frequently, posing a serious threat to people's lives and property. Traditional combustible gas detectors are mostly single-function, only capable of simple gas concentration detection and alarm, and have the following problems:

[0003] Limited alarm methods: Most traditional detectors only emit sound alarms through a buzzer, lacking light or other forms of warning, and cannot remotely notify users, making it difficult to detect alarm information in a timely manner in noisy environments or when the user is not present.

[0004] Lack of linkage function: Traditional detectors cannot link with gas valves and other equipment after detecting a gas leak, thus failing to cut off the gas supply in time and effectively prevent the accident from escalating.

[0005] Weak data transmission capability: Most traditional detectors do not have wireless communication capabilities, so they cannot transmit detection data to the cloud or user terminal in real time. Users cannot remotely monitor gas usage and equipment status, which is also not conducive to subsequent data analysis and management.

[0006] Limited detection accuracy: Traditional detectors are usually equipped with only a single gas sensor, which has a large difference in sensitivity to different types of combustible gases, making them prone to false alarms or missed alarms, and thus unable to meet the requirements of high-precision detection. Utility Model Content

[0007] In view of the problems existing in the prior art, this utility model provides a combustible gas detector.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] This utility model provides a combustible gas detector, including: a front shell, a bottom shell detachably connected to the front shell, a PCB board disposed between the front shell and the bottom shell, a battery cover disposed on the bottom shell, a mounting plate disposed at the bottom of the bottom shell, and a solenoid valve output line and a power output line disposed at one end of the front shell and the bottom shell.

[0010] 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 WIFI module, a button circuit, a main control power supply circuit, and a gas detection power supply circuit.

[0011] The corresponding terminals of the main control circuit are electrically connected to the corresponding terminals of the power supply circuit, gas detection circuit, RF433 transmitter circuit, buzzer circuit, solenoid valve circuit, gas meter circuit, indicator light circuit, WIFI module, button circuit, main control power supply circuit, and gas detection power supply circuit, respectively.

[0012] 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, and gas meter circuit, and the 5V voltage is used to power the main control power supply circuit and the gas detection power supply circuit. The corresponding terminal of the gas detection power supply circuit is electrically connected to the corresponding terminal of the gas detection circuit.

[0013] Preferably, the front end of the bottom shell is provided with a notch, and the heads of the solenoid valve output line and the power output line are respectively engaged at the notch. The front shell is provided with multiple indicator light mounting openings arranged side by side.

[0014] Preferably, the main control circuit includes an MCU, the model of which is CIU32F003F5P6-TSSOP20.

[0015] 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.

[0016] Preferably, 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.

[0017] 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.

[0018] The first end of inductor L1 is electrically connected to the first end of capacitor C5 and the corresponding end of the rectifier bridge circuit. The second end of inductor L1 is electrically connected to the first end of capacitor C6, the first end of capacitor C3, the first end of resistor R2, and the first pin of transformer T1. The second end of capacitor C5 is electrically connected to the rectifier bridge circuit, the second end of capacitor C6, and the corresponding end of switching power supply chip DK106. The second pin of transformer T1 is electrically connected to the second end of resistor R2 and the second end of capacitor C3 via diode D4. The second pin of transformer T1 is also electrically connected to the corresponding end of switching power supply chip DK106.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 LT1117-3V3.

[0023] Preferably, the gas detection power supply circuit includes a voltage regulator chip STI3472 and its peripheral circuits, with the corresponding terminals of the voltage regulator chip STI3472 electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

[0024] Preferably, the gas detection circuit includes a first combustible gas sensor SR1, a second combustible gas sensor SR2, a third combustible gas sensor SR3, a thermistor RT2, a resistor R47, a resistor R48, a capacitor C42, and a capacitor C7.

[0025] The first terminal of the capacitor C42 is electrically connected to the corresponding terminal of the voltage regulator chip STI3472, the first and fourth pins of the second combustible gas sensor SR2, the third and fourth pins of the third combustible gas sensor SR3, and the first and third pins of the first combustible gas sensor SR1.

[0026] The fourth pin of the first combustible gas sensor SR1 is connected to resistor R47, the second pin of the third combustible gas sensor SR3, and the third pin of the second combustible gas sensor SR2. The second pin of the second combustible gas sensor SR2 is electrically connected to the first pin of the third combustible gas sensor SR3, the second pin of the first combustible gas sensor SR1, the first end of resistor R48, the first end of the thermistor RT2, and the first end of capacitor C7. The second end of resistor R47 is electrically connected to the second end of resistor R48, the second end of the thermistor RT2, the second end of capacitor C7, and the corresponding end of the MCU.

[0027] Preferably, the PCB board is further provided with a program download circuit, and the corresponding terminal of the program download circuit is electrically connected to the corresponding terminal of the MCU.

[0028] The technical solution of this utility model has the following beneficial effects:

[0029] Diverse alarm modes: Combining buzzer and indicator light circuits, it achieves dual audible and visual alarms, attracting user attention even in noisy environments through flashing lights. Simultaneously, via the RF433 transmitter circuit and WIFI module, the alarm signal can be wirelessly transmitted to external devices (such as alarm control panels, mobile phones, etc.) for remote alarm functionality, ensuring users receive alarm information promptly.

[0030] Intelligent linkage control: The main control circuit can be linked with the solenoid valve circuit to quickly cut off the gas supply when a gas leak is detected, effectively preventing the accident from escalating. Furthermore, it can work with the gas meter circuit to achieve real-time monitoring and management of gas usage, improving the safety and economy of gas use.

[0031] Powerful data transmission and management capabilities: The detection data is uploaded to the cloud server or management platform in real time via the WIFI module. Users can remotely view information such as gas concentration, equipment status and gas usage anytime and anywhere via mobile devices, which facilitates remote monitoring and data analysis for users and provides gas management departments with effective management tools.

[0032] Stable power management: The power supply circuit can simultaneously output 12V and 5V voltages, providing stable power to the main control power supply, gas detection, buzzer, solenoid valve, and other circuits. The main control power supply circuit uses the LT1117-3V3 voltage regulator chip to ensure stable operation of the MCU; the gas detection power supply circuit uses the STI3472 voltage regulator chip to ensure the detection accuracy of the gas sensor and extend the service life of the equipment.

[0033] High-precision detection: Equipped with various models of combustible gas sensors (such as MQ-D4B, MQ-4B, TGS2619-C00), it can perform high-sensitivity detection of various combustible gases, effectively improving detection accuracy, reducing false alarms and missed alarms, and ensuring the reliability of gas leak detection.

[0034] Easy to install and maintain: The front and bottom shells are detachably connected, facilitating equipment installation, debugging, and maintenance. The mounting plate has screw holes, allowing for flexible installation in different locations, offering strong adaptability. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ;

[0036] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ;

[0037] Figure 3 This is an exploded view of the structure of this utility model;

[0038] Figure 4 This is a block diagram of the control circuit of this utility model;

[0039] Figure 5 This is a circuit diagram of the control circuit of this utility model;

[0040] Figure 6 This is the circuit diagram of the solenoid valve circuit of this utility model;

[0041] Figure 7 This is the circuit diagram of the gas meter circuit of this utility model;

[0042] Figure 8 This is the circuit diagram of the buzzer circuit of this utility model;

[0043] Figure 9 This is the circuit diagram of the indicator light circuit of this utility model;

[0044] Figure 10 This is a circuit diagram of the gas detection circuit of this utility model;

[0045] Figure 11 This is the circuit schematic diagram of the RF433 transmitting circuit of this utility model;

[0046] Figure 12 This is a circuit diagram of the temperature detection circuit of this utility model;

[0047] Figure 13 This is the circuit diagram of the power supply circuit of this utility model;

[0048] Figure 14The circuit diagram of the main control power supply circuit of this utility model;

[0049] Figure 15 This is the circuit schematic diagram of the WIFI module of this utility model;

[0050] Figure 16 The circuit diagram is for the gas detection power supply circuit of this utility model. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Reference Figures 1 to 16 This utility model provides a combustible gas detector, comprising: a front shell 3, a bottom shell 5 detachably connected to the front shell 3, a PCB board 4 disposed between the front shell 3 and the bottom shell 5, a battery cover 6 disposed on the bottom shell 5, a mounting plate 8 disposed at the bottom of the bottom shell 5, and a solenoid valve output line 1 and a power output line 2 disposed at one end of the front shell 3 and the bottom shell 5; the front shell 3 and the bottom shell 5 are detachably connected by screws 7; the mounting plate 8 is also provided with screw holes;

[0057] 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 WIFI module 110, a button circuit 130, a main control power supply circuit 100, and a gas detection power supply circuit 160.

[0058] The corresponding terminals of the main control circuit 10 are electrically connected to the corresponding terminals of the power supply circuit 90, gas detection circuit 60, RF433 transmitter circuit 70, buzzer circuit 40, solenoid valve circuit 20, gas meter circuit 30, indicator light circuit 50, WIFI module 110, button circuit 130, main control power supply circuit 100, and gas detection power supply circuit 160, respectively.

[0059] 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, and the gas meter circuit 30, and the 5V voltage is used to power the main control power supply circuit 100 and the gas detection power supply circuit 160. The corresponding terminal of the gas detection power supply circuit 160 is electrically connected to the corresponding terminal of the gas detection circuit 60.

[0060] Furthermore, the front end of the bottom shell 5 is provided with a notch to prevent displacement or detachment during use. Correspondingly, the heads of the solenoid valve output line 1 and the power output line 2 are secured at the notch. The front shell 3 is provided with multiple side-by-side indicator light mounting openings, so that multiple indicator lights can be neatly arranged on the front shell 3, making it convenient for users to observe the working status of the equipment.

[0061] Furthermore, the main control circuit includes an MCU, model CIU32F003F5P6-TSSOP20. The MCU receives sensor data from the gas detection circuit 60, analyzes and processes it to determine whether the gas concentration exceeds the safety threshold. Based on the data processing results, it controls the buzzer circuit 40 and the solenoid valve circuit 20 to perform corresponding actions, such as issuing an alarm or closing the gas valve.

[0062] Data communication with external devices is achieved through the RF433 transmitter circuit 70 or the WIFI module 110, enabling the transmission of gas detection results or the reception of remote commands.

[0063] Furthermore, 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. 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 902, and the transformer circuit 901. The 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. The corresponding terminals of the switching power supply control circuit 902 are also electrically connected to the corresponding terminals of the optocoupler circuit 903. The switching power supply control circuit 902 is responsible for controlling the switching operation of the power supply, realizing voltage regulation and power management. The optocoupler circuit 903 provides electrical isolation, protecting the control circuit from the influence of high-voltage components. 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. The transformer circuit includes a transformer T1, inductors L1 and L2, diodes D10 and 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 the switching power supply chip DK106. The second pin of transformer T1 is electrically connected via diode D4 to the second terminals of resistor R2 and capacitor C3. The second pin of transformer T1 is also connected to the switching power supply chip DK106. The power supply chip DK106 is electrically connected to the corresponding terminal; the third pin of the transformer T1 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 fourth pin of the transformer T1 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 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.

[0064] Furthermore, 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 LT1117-3V3.

[0065] Furthermore, the gas detection power supply circuit includes a voltage regulator chip STI3472 and its peripheral circuits. The corresponding terminals of the voltage regulator chip STI3472 are electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

[0066] The gas detection circuit includes a first combustible gas sensor SR1, a second combustible gas sensor SR2, a third combustible gas sensor SR3, a thermistor RT2, a resistor R47, a resistor R48, a capacitor C42, and a capacitor C7.

[0067] The first terminal of the capacitor C42 is electrically connected to the corresponding terminal of the voltage regulator chip STI3472, the first and fourth pins of the second combustible gas sensor SR2, the third and fourth pins of the third combustible gas sensor SR3, and the first and third pins of the first combustible gas sensor SR1.

[0068] The fourth pin of the first combustible gas sensor SR1 is connected to resistor R47, the second pin of the third combustible gas sensor SR3, and the third pin of the second combustible gas sensor SR2. The second pin of the second combustible gas sensor SR2 is electrically connected to the first pin of the third combustible gas sensor SR3, the second pin of the first combustible gas sensor SR1, the first end of resistor R48, the first end of the thermistor RT2, and the first end of capacitor C7. The second end of resistor R47 is electrically connected to the second end of resistor R48, the second end of the thermistor RT2, the second end of capacitor C7, and the corresponding end of the MCU.

[0069] The first combustible gas sensor is model MQ-D4B, the second combustible gas sensor is model MQ-4B, and the third combustible gas sensor is model TGS2619-C00. By using multiple sensors, the gas detection circuit can perform highly sensitive detection of combustible gases in the environment.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] When the gas meter malfunctions or becomes abnormal, it promptly sends a signal to the main control circuit 10 to trigger the alarm mechanism.

[0075] 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.

[0076] 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.

[0077] Temperature data can be uploaded to a cloud server or management platform to facilitate remote monitoring by users and administrators.

[0078] The WIFI module 110 in the combustible gas detector enables wireless communication. Through the WIFI module, the gas concentration data detected by the detector can be wirelessly transmitted to the user's mobile device or remote monitoring system, enabling remote monitoring and alarm functions. This wireless communication capability improves the detector's flexibility and convenience, allowing users to receive alarms and monitoring data anywhere with a network connection.

[0079] Furthermore, the PCB board is also equipped with a program download circuit, the corresponding terminal of which is electrically connected to the corresponding terminal of the MCU.

[0080] The working principle of this utility model is as follows:

[0081] 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 transmitter 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 gas meter circuit sends the checked data to the MCU and uploads the gas usage data to the cloud via the WIFI module 110 for users to view and manage remotely.

[0082] 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 flammable gas detector, characterised in that, include: The front cover, the bottom cover detachably connected to the front cover, the PCB board between the front cover and the bottom cover, the battery cover on the bottom cover, the mounting plate at the bottom of the bottom cover, and the solenoid valve output line and power output line at one end of the front cover and the bottom cover. 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 WIFI module, a button circuit, a main control power supply circuit, and a gas detection power supply circuit. The corresponding terminals of the main control circuit are electrically connected to the corresponding terminals of the power supply circuit, gas detection circuit, RF433 transmitter circuit, buzzer circuit, solenoid valve circuit, gas meter circuit, indicator light circuit, WIFI module, button circuit, main control power supply circuit, and gas detection power supply circuit, respectively. 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, and gas meter circuit, and the 5V voltage is used to power the main control power supply circuit and the gas detection power supply circuit. The corresponding terminal of the gas detection power supply circuit is electrically connected to the corresponding terminal of the gas detection circuit.

2. The combustible gas detector of claim 1, wherein, The front end of the bottom shell has a notch, and the heads of the solenoid valve output line and the power output line are respectively locked in the notch. The front shell has multiple indicator light mounting openings arranged side by side.

3. The combustible gas detector of claim 1, wherein, The main control circuit includes an MCU, model number CIU32F003F5P6-TSSOP20.

4. The combustible gas detector of claim 3, wherein, 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. The corresponding terminals of the switching power supply control circuit are also electrically connected to the corresponding terminals of the optocoupler circuit, respectively.

5. The combustible gas detector of claim 4, wherein, 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 combustible gas detector of claim 4, wherein, 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 end of inductor L1 is electrically connected to the first end of capacitor C5 and the corresponding end of the rectifier bridge circuit. The second end of inductor L1 is electrically connected to the first end of capacitor C6, the first end of capacitor C3, the first end of resistor R2, and the first pin of transformer T1. The second end of capacitor C5 is electrically connected to the rectifier bridge circuit, the second end of capacitor C6, and the corresponding end of switching power supply chip DK106. The second pin of transformer T1 is electrically connected to the second end of resistor R2 and the second end of capacitor C3 via diode D4. The second pin of transformer T1 is also electrically connected to the corresponding end of switching power supply chip DK106. 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 combustible gas detector of claim 6, wherein, 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 LT1117-3V3.

8. The combustible gas detector of claim 7, wherein, The gas detection power supply circuit includes a voltage regulator chip STI3472 and its peripheral circuits. The corresponding terminals of the voltage regulator chip STI3472 are electrically connected to the corresponding terminals of the MCU and the gas detection circuit, respectively.

9. The combustible gas detector of claim 8, wherein, The gas detection circuit includes a first combustible gas sensor SR1, a second combustible gas sensor SR2, a third combustible gas sensor SR3, a thermistor RT2, a resistor R47, a resistor R48, a capacitor C42, and a capacitor C7. The first terminal of the capacitor C42 is electrically connected to the corresponding terminal of the voltage regulator chip STI3472, the first and fourth pins of the second combustible gas sensor SR2, the third and fourth pins of the third combustible gas sensor SR3, and the first and third pins of the first combustible gas sensor SR1. The fourth pin of the first combustible gas sensor SR1 is connected to resistor R47, the second pin of the third combustible gas sensor SR3, and the third pin of the second combustible gas sensor SR2. The second pin of the second combustible gas sensor SR2 is electrically connected to the first pin of the third combustible gas sensor SR3, the second pin of the first combustible gas sensor SR1, the first end of resistor R48, the first end of the thermistor RT2, and the first end of capacitor C7. The second end of resistor R47 is electrically connected to the second end of resistor R48, the second end of the thermistor RT2, the second end of capacitor C7, and the corresponding end of the MCU.

10. The combustible gas detector of claim 9, wherein, The PCB board is also equipped with a program download circuit, and the corresponding terminal of the program download circuit is electrically connected to the corresponding terminal of the MCU.

Images