A domestic combustible gas detection device

Abstract

The utility model provides a domestic combustible gas detection device, including power module, and with power module respectively electric connection's collection module, control module, communication module and alarm module, collection module still is connected with control module, is used for gathering the concentration signal of domestic combustible gas, and exports to control module, control module is used for when concentration signal is lower than the preset threshold value, sends the disconnect control signal, and when concentration signal reaches the preset threshold value, sends control signal and alarm signal, communication module and alarm module are connected with control module respectively, are used for when receiving the disconnect control signal, disconnects the connection with power module, makes power module only to collection module and control module power supply, communication module still is used for when receiving control signal, sends the running state and alarm information of domestic combustible gas detection device to remote terminal platform, alarm module still is used for when receiving alarm signal, executes audible -visual alarm.

Description

Technical Field

[0001] This utility model relates to the field of household safety detection technology, and in particular to the design of a household combustible gas detection device. Background Technology

[0002] With the continuous improvement of urban and rural gas infrastructure in my country, the penetration rate of household gas has gradually increased, and gas supply has expanded from urban areas to rural areas. However, the rapid popularization of gas has also brought challenges in safety management. In some areas, gas pipelines are mostly laid in the open, making them susceptible to damage from the natural environment and external forces; some users' gas stoves lack flameout protection functions; and users' awareness of safe gas operation still needs to be improved.

[0003] Although there are national standards for existing household combustible gas detectors, technical deficiencies still exist in practical use. The detection sensitivity and response speed for early leaks are insufficient; the devices are easily affected by oil fumes, water vapor, or other interference factors in complex environments, leading to false alarms; the linkage function between alarm signals and safety control devices such as gas valve closure is imperfect; and the detectors have poor adaptability to different installation environments and user operating habits. Overall safety protection capabilities still need improvement, making it difficult to comprehensively ensure the safety of household gas use under widespread application conditions. Utility Model Content

[0004] The purpose of this invention is to provide a low-power household combustible gas detection device to achieve rapid and accurate leak detection and alarm, reduce power consumption in non-alarm state, and reliably link with gas valves or remote platforms.

[0005] This utility model provides a household combustible gas detection device, including a power module, and a data acquisition module, a control module, a communication module and an alarm module that are electrically connected to the power module respectively; The acquisition module is also connected to the control module and is used to acquire the concentration signal of the household combustible gas and output it to the control module. The control module is used to send a disconnection control signal when the concentration signal is lower than a preset threshold, and to send a control signal and an alarm signal when the concentration signal reaches the preset threshold. The communication module and alarm module are respectively connected to the control module and are used to disconnect from the power module when the disconnection control signal is received, so that the power module only supplies power to the acquisition module and the control module. The communication module is also used to send the operating status and alarm information of the household combustible gas detection device to the remote platform when the control signal is received; The alarm module is also used to execute an audible and visual alarm when the alarm signal is received.

[0006] Optionally, the power module includes a first power unit and a second power unit connected to each other; The first power supply unit is used to convert the input voltage into a first voltage to supply power to the acquisition module and the alarm module; The second power supply unit is used to convert the first voltage into a second voltage to supply power to the control module and the communication module.

[0007] Optionally, the control module includes a first chip and a Bluetooth unit that are interconnected. The first chip has an RFIOP pin, which is used to send a trigger signal to control the Bluetooth unit to work when the concentration signal reaches the preset threshold. The Bluetooth unit is connected to the antenna via its RFIOP pin, and is used to transmit concentration information data to an external receiving device in the form of radio frequency signals. The Bluetooth unit is also used to send a control command to the matched external gas meter via the Bluetooth communication protocol after receiving the trigger signal. The external gas meter responds to the control command by driving its internal electronically controlled valve to close and cut off the output of combustible gas.

[0008] Optionally, the Bluetooth unit includes inductor L3, inductor L4, capacitor C22, capacitor C24, bidirectional diode D5, and antenna interface RF1; The first end of the inductor L3 is connected to the RFIOP pin, and the second end is connected to the antenna interface RF1 in sequence through the capacitor C22 and the inductor L4; One end of the capacitor C24 is connected to the second end of the inductor L3, and the other end of the capacitor C24 is grounded. One end of the bidirectional diode D5 is connected between the inductor L4 and the antenna interface RF1, and the other end of the bidirectional diode D5 is grounded.

[0009] Optionally, the first chip also has PB4 / U2TX pins and PB5 / U2RX pins; The communication module includes a second chip, which has an RXD pin and a TXD pin. The RXD pin is connected to the PB4 / U2TX pin, and the TXD pin is connected to the PB5 / U2RX pin.

[0010] Optionally, the first chip also has a PB13 pin, and the second chip also has a RESET pin, which is connected to the PB13 pin.

[0011] Optionally, the first chip also has a PB0 pin; The alarm module includes resistor R28, resistor R29, transistor Q4, diode D9, and buzzer LS1; The first end of the resistor R28 is connected to the PB0 pin, and the second end is connected to the base of the transistor Q4; One end of the resistor R29 is connected to the base of the transistor Q4, and the other end is grounded; The first terminal of the buzzer LS1 is connected to the second terminal of the buzzer LS1 via the diode D9; The collector of the transistor Q4 is connected to the second terminal of the buzzer LS1, and the emitter is grounded.

[0012] Optionally, the alarm module further includes a magnetic bead B2 and a capacitor C40; The first end of the magnetic bead B2 is connected to the first power supply unit, and the second end is grounded through the capacitor C40. The second end of the magnetic bead B2 is also connected to the first end of the buzzer LS1.

[0013] Optionally, the acquisition module includes sensor U7, resistor R22, and resistor RL1; The first pin of the sensor U7 is grounded through the resistor RL1, the second pin is connected to the power module, the third pin is connected to the first pin of the sensor U7, the fourth and sixth pins are both connected to the power module, and the fifth pin is grounded. The resistor R22 is connected in parallel with the resistor RL1.

[0014] Optionally, the acquisition module further includes resistor R20, resistor R21, and capacitor C35; The first end of the resistor R20 is connected to the first pin of the sensor U7, and the second end of the resistor R20 is connected to the PB10 / ADC1 pin of the first chip. The first terminals of resistor R21 and capacitor C35 are both connected to the second terminal of resistor R20, and the second terminals of resistor R21 and capacitor C35 are grounded.

[0015] According to the solution of this utility model, by rationally connecting the power supply module, acquisition module, control module, communication module, and alarm module, the device supplies power only to the acquisition module and control module in low-power mode, achieving low-power operation and maintaining stable system operation. Simultaneously, when the combustible gas concentration is abnormal, the control module outputs an alarm signal to the alarm module, enabling the alarm module to promptly execute an audible and visual alarm. The communication module then transmits the operating status and alarm information to a remote platform, achieving timely monitoring and feedback of the home environment. This ensures stable operation and energy efficiency under monitoring and alarm conditions. The structure of this utility model guarantees stable and reliable operation of the device under normal monitoring and alarm conditions, while achieving low-power control and improving energy efficiency.

[0016] Furthermore, by dividing the power supply module into two levels, each module receives a suitable operating voltage, thereby improving the overall stability of the system. Based on this, the acquisition module, supported by a stable voltage, outputs a stable concentration signal through sensors, current-limiting resistors, and filter capacitors, providing a reliable basis for the control module's judgment. The first chip inside the control module works in conjunction with the Bluetooth unit to directly control the external gas meter's valve to close when gas concentration is abnormal, achieving a rapid and safe response. Simultaneously, the alarm module's buzzer, transistors, and ferrite beads, along with filtering and interference suppression circuits, ensure accurate and reliable audible and visual alarms. The communication module connects to the control chip via a serial port and uses a reset pin to control power supply, ensuring the stability and reliability of remote information transmission. The overall structure of this invention enables the device to maintain high reliability and safety even under low power consumption conditions, ensuring efficient operation of the household combustible gas monitoring, alarm, and information feedback functions.

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below. Attached Figure Description

[0018] Figure 1 A structural block diagram of a household combustible gas detector according to an embodiment of the present invention is shown; Figure 2 A circuit topology diagram of a first power supply unit according to an embodiment of the present invention is shown; Figure 3 A circuit topology diagram of a second power supply unit according to an embodiment of the present invention is shown; Figure 4 A circuit topology diagram of a control module according to an embodiment of the present invention is shown; Figure 5 A circuit topology diagram of a communication module according to an embodiment of the present invention is shown; Figure 6A circuit topology diagram of an alarm module according to an embodiment of the present invention is shown; Figure 7 A circuit topology diagram of a data acquisition module according to an embodiment of the present invention is shown. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0020] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] Figure 1 A structural block diagram of a low-power household combustible gas detector according to an embodiment of the present invention is shown. Figure 1As shown, this low-power household combustible gas detector includes a power module 10, and a data acquisition module 20, a control module 30, a communication module 50, and an alarm module 40, all electrically connected to the power module 10. The data acquisition module 20 is also connected to the control module 30, used to acquire the concentration signal of household combustible gas and output it to the control module 30. The control module 30 is used to send a disconnect control signal when the concentration signal is below a preset threshold, and to send a control signal and an alarm signal when the concentration signal reaches the preset threshold. The communication module 50 and the alarm module 40 are respectively connected to the control module 30, used to disconnect from the power module 10 upon receiving the disconnect control signal, so that the power module 10 only supplies power to the data acquisition module 20 and the control module 30. The communication module 50 is also used to send the operating status and alarm information of the household combustible gas detector to a remote platform upon receiving the control signal. The alarm module 40 is also used to execute an audible and visual alarm upon receiving an alarm signal.

[0023] According to the above embodiments, by reasonably connecting the power module 10, acquisition module 20, control module 30, communication module 50, and alarm module 40, the device supplies power only to the acquisition module 20 and control module 30 in low-power mode, achieving low-power mode and maintaining stable system operation. Simultaneously, when the combustible gas concentration is abnormal, the control module 30 outputs an alarm signal to the alarm module 40, causing the alarm module 40 to promptly execute an audible and visual alarm. The communication module 50 then transmits the operating status and alarm information to a remote platform, enabling timely monitoring and feedback of the home environment. This ensures stable operation and energy efficiency under monitoring and alarm conditions. The structure of this invention ensures stable and reliable operation of the device under normal monitoring and alarm conditions, while achieving low-power control and improving energy efficiency.

[0024] In one embodiment, the power module 10 includes a first power unit and a second power unit that are interconnected. Figure 2 A circuit topology diagram of a first power supply unit according to an embodiment of the present invention is shown. Figure 3 A circuit topology diagram of a second power supply unit according to an embodiment of the present invention is shown. Figure 2 As shown, the first power supply unit is used to convert the input voltage into a first voltage to supply power to the acquisition module 20 and the alarm module 40. Figure 3 As shown, the second power supply unit is used to convert the first voltage into a second voltage to supply power to the control module 30 and the communication module 50.

[0025] In this embodiment, the power module 10 uses a DC-DC converter chip in an SOT-23-6 package to convert the input voltage into a suitable operating voltage, providing a stable power supply for each module. This chip features fast transient response, overcurrent protection, input overvoltage protection, thermal shutdown, and soft-start functions, and achieves low ripple output through ceramic capacitors. In application, the 12V input voltage is filtered and decoupled before being input to the converter chip U4, which outputs a first voltage of 5V to power the acquisition module 20 and the alarm module 40. Subsequently, the voltage is further stepped down to 3.3V by the voltage regulator chip U5, providing the required voltage for the control module 30 and the communication module 50. This design ensures a stable and reliable power supply for each circuit module, improving the overall performance and system reliability of the device.

[0026] Figure 4 A circuit topology diagram of a control module 30 according to an embodiment of the present invention is shown. Figure 4 As shown, the control module 30 includes a first chip and a Bluetooth unit interconnected. The first chip sends a trigger signal to control the Bluetooth unit when the concentration signal reaches a preset threshold. The Bluetooth unit is connected to an antenna via its RFIOP pin and transmits concentration information data to an external receiving device in the form of a radio frequency signal. Upon receiving the trigger signal, the Bluetooth unit also sends a control command to a matched external gas meter via the Bluetooth communication protocol. In response to the control command, the external gas meter drives its internal electronically controlled valve to close, cutting off the output of combustible gas.

[0027] In this embodiment, the first chip inside the control module 30 works closely with the Bluetooth unit to remotely control the external gas meter via high-frequency radio frequency (RF) signals. When an abnormal gas concentration is detected, the first chip triggers the Bluetooth unit to send a high-frequency RF signal to the external gas meter through its RFIOP pin. This RF signal modulates relevant valve commands, ensuring that the gas meter promptly performs valve closing operations, thereby improving the overall system's safety protection capabilities. Simultaneously, this structural design simplifies the signal transmission path between modules, making the control response more efficient and reliable.

[0028] In one embodiment, reference Figure 4 The Bluetooth unit includes inductor L3, inductor L4, capacitors C22 and C24, bidirectional diode D5, and antenna interface RF1. The first end of inductor L3 is connected to the RF1 pin, and the second end is connected to the antenna interface RF1 via capacitor C22 and inductor L4. One end of capacitor C24 is connected to the second end of inductor L3, and the other end of capacitor C24 is grounded. One end of bidirectional diode D5 is connected between inductor L4 and antenna interface RF1, and the other end of bidirectional diode D5 is grounded.

[0029] In this embodiment, the inductors, capacitors, and bidirectional diodes of the Bluetooth unit are connected in a specific topology to form an radio frequency circuit, achieving effective matching with the antenna interface. This ensures that the control signal can be reliably transmitted to the external gas meter, thereby promptly sending a valve-closing command when an abnormal gas concentration is detected. This design not only guarantees the accuracy and response speed of the valve-closing operation, but also improves the overall system's safety and reliability through coordinated operation between modules.

[0030] In one embodiment, when the gas concentration is below a preset threshold, the control module 30 outputs a low-level or disconnect control signal through the RFIOP pin of the first chip, causing the Bluetooth unit to be in a shutdown or sleep state, thereby interrupting its energy transmission with the power module 10. Since the Bluetooth unit generates additional power consumption during communication and standby, controlling it to stop working effectively reduces system power consumption in a safe state, avoiding the battery burden caused by keeping the RF module powered on for extended periods. In this embodiment, the Bluetooth unit is only activated when a valve-closing command or other communication functions are required, thus balancing the reliability of RF communication with the system's low-power requirements.

[0031] In the above embodiment, the control module 30 uses the N32WB031 chip from National Technologies as the first chip. This chip adopts a QFN-32 package, integrates an ARM Cortex-M0 core, has a maximum clock frequency of 64MHz, 512K ROM and 48K RAM, and is equipped with abundant peripheral resources to meet the high-performance processing requirements of the control module 30. To ensure the stability of the chip during operation, capacitor filters (C19, C21, C27, C28, C29) are set on all VDD power supply pins, effectively enhancing the system's anti-electromagnetic interference capability and ensuring the overall reliability of operation.

[0032] The functions of each pin in the first chip are as follows: Pin 1 connects to the button for self-testing; Pin 2 connects to the solenoid valve control pin for opening and closing the solenoid valve; Pin 4 connects to the alarm module 40 control pin for controlling the buzzer; Pins 5 and 6 form the SWD interface for programming and debugging; Pins 9 and 10 connect to 32.768... A kHz crystal oscillator provides a high-precision timing reference for the control module 30; pins 11 and 12 serve as serial port 0, reserved for printing and debugging; pin 13 is used for low-power wake-up control; pins 14 and 15 form serial port 1, connected to the communication module 50 for data communication; pins 16 and 17 form serial port 2, used to output alarm and fault record information; pin 18 connects to the acquisition module 20 to acquire voltage changes from the sensor; pins 19 and 20 connect to a shift register to control the LED's on / off state; pin 21 controls the reset of the communication module 50; pin 25 is a Bluetooth antenna interface; pins 30 and 31 connect to a 32 MHz crystal oscillator, providing a high-precision timing reference for the control module 30. Through the above design, reliable data interaction and control are achieved between the functional modules and the control module 30, enabling the control module 30 to efficiently and stably complete gas detection, alarm, and communication tasks.

[0033] In one embodiment, reference Figure 4 The first chip also has PB4 / U2TX pins and PB5 / U2RX pins. Figure 5 A circuit topology diagram of a communication module 50 according to an embodiment of the present invention is shown. Figure 5 As shown, the communication module 50 includes a second chip with an RXD pin and a TXD pin. The RXD pin is connected to the PB4 / U2TX pin, and the TXD pin is connected to the PB5 / U2RX pin.

[0034] In this embodiment, by establishing independent transmit and receive pin connections between the first chip and the second chip, the control module 30 can complete data interaction via stable serial communication. After the first chip processes external sensor data or control commands, it can reliably transmit the data to the second chip via its PB4 / U2TX pin; simultaneously, the return information processed by the second chip can be sent back to the first chip's PB5 / U2RX pin via its TXD pin. Based on this bidirectional communication link, the system exhibits higher real-time performance and consistency when performing parameter verification, status reporting, or control command issuance, thereby ensuring a smooth overall control flow and further enhancing the reliability and scalability of this invention.

[0035] In one embodiment, reference Figure 4 and Figure 5The first chip also has a PB13 pin, and the second chip also has a RESET pin, which is connected to the PB13 pin.

[0036] In this embodiment, by connecting the RESET pin of the second chip to the PB13 pin of the first chip, the first chip can perform reset control on the second chip. When a communication abnormality, data verification failure, or peripheral state re-initialization is detected, the first chip can drive the PB13 pin to output a corresponding reset level, thereby enabling the second chip to quickly return to its initial normal operating state. With this reset control link, the system can recover promptly in the event of sudden interference or communication abnormalities, further improving the stability of the overall communication process and the reliability of module collaboration.

[0037] In addition, the RESET pin is also used to control the shutdown between the communication module 50 and the power module 10. When the concentration of combustible gas in the household is below a preset threshold and the system is in a safe state, the control module 30 outputs a disconnect control signal to the RESET pin of the second chip through the PB13 pin of the first chip, causing the communication module 50 to disconnect its power supply connection with the power module 10. Through this on-demand shutdown method, the system can effectively reduce overall power consumption during non-working periods, while avoiding unnecessary power consumption caused by the communication module 50 being in standby mode for a long time, thereby further improving the operating efficiency of the system in low-power scenarios.

[0038] In the above embodiment, the communication module 50 uses Quectel's BC260Y-CN module. This module is powered by a 3.3V power supply provided by a voltage regulator chip, and multiple capacitors are configured at the power input terminal to achieve filtering and decoupling, thereby ensuring power stability. This module communicates with the first chip via a serial communication port and integrates a SIM card interface, enabling connection and reading of SIM card information, supporting device authentication and communication functions. Simultaneously, antenna pins are used to connect an external antenna to ensure effective transmission and reception of wireless signals.

[0039] In one embodiment, reference Figure 4 The first chip also has a PB0 pin. Figure 6 A circuit topology diagram of an alarm module 40 according to an embodiment of the present invention is shown. Figure 6 As shown, the alarm module 40 includes resistors R28 and R29, transistor Q4, diode D9, and buzzer LS1. The first end of resistor R28 is connected to the PB0 pin, and the second end is connected to the base of transistor Q4. One end of resistor R29 is connected to the base of transistor Q4, and the other end is grounded. The first end of buzzer LS1 is connected to the second end of buzzer LS1 through diode D9. The collector of transistor Q4 is connected to the second end of buzzer LS1, and its emitter is grounded.

[0040] In one embodiment, reference Figure 6 The alarm module 40 also includes a ferrite bead B2 and a capacitor C40. The first end of the ferrite bead B2 is connected to the first power supply unit, and the second end is grounded through the capacitor C40. The second end of the ferrite bead B2 is also connected to the first end of the buzzer LS1.

[0041] In the above embodiment, the transistor Q4 in the alarm module 40 uses an NPN transistor as a switching device to control the working state of the buzzer LS1. When the gas concentration reaches or exceeds a preset threshold, the first chip outputs a high level to the base of transistor Q4, turning on transistor Q4 and driving buzzer LS1 to sound; when the gas concentration is below the threshold and in a safe state, the base of transistor Q4 remains at a low level, transistor Q4 is in the off state, and buzzer LS1 does not work. Simultaneously, to reduce power consumption in the non-alarm state, the power supply module 10 does not supply power to the alarm module 40 in this situation, thereby avoiding unnecessary energy consumption. To further improve the stability of circuit operation, a ferrite bead B2 is set at the power input terminal of the alarm module 40 to suppress high-frequency noise and reduce the impact of external electromagnetic interference on subsequent circuits; and a rectifier diode D9 is connected in series in the power input path to prevent reverse current from impacting the chip, ensuring that the current is input in a predetermined direction and protecting related devices.

[0042] Figure 7 A circuit topology diagram of a data acquisition module 20 according to an embodiment of the present invention is shown. Figure 7 As shown, the acquisition module 20 includes a sensor U7, a resistor R22, and a resistor RL1. The first pin of the sensor U7 is grounded through the resistor RL1, the second pin is connected to the power module 10, the third pin is connected to the first pin of the sensor U7, the fourth and sixth pins are both connected to the power module 10, the fifth pin is grounded, and the resistor R22 is connected in parallel with the resistor RL1.

[0043] In one embodiment, reference Figure 7 The acquisition module 20 also includes resistors R20 and R21, and capacitor C35. The first end of resistor R20 is connected to the first pin of sensor U7, and the second end of resistor R20 is connected to the PB10 / ADC1 pin of the first chip. The first ends of resistor R21 and capacitor C35 are both connected to the second end of resistor R20, and the second ends of resistor R21 and capacitor C35 are grounded.

[0044] In the above embodiment, the sensor U7 of the acquisition module 20 is a Figaro gas sensor used to detect combustible gases such as methane. The first pin of the sensor U7 is connected to the signal output terminal Vsense_CH4, which is used to output the detected gas concentration signal. Resistor R22 not only limits the operating current of the sensor heating wire, but also plays a temperature compensation role, so that the sensor can maintain stable performance under different ambient temperatures. After the Vsense_CH4 signal is current-limited by resistor R20, it is filtered by a low-pass filter composed of resistor R21 and capacitor C35 to remove high-frequency noise and ensure that the output signal is smooth and stable.

[0045] According to the above embodiment, by dividing the power supply module 10 into two power supply stages, each module obtains a suitable operating voltage, thereby improving the overall stability of the system. Based on this, the acquisition module 20, supported by a stable voltage, stably outputs a concentration signal through sensors, current-limiting resistors, and filter capacitors, providing a reliable basis for judgment for the control module 30. The first chip inside the control module 30 works in conjunction with the Bluetooth unit, directly controlling the external gas meter valve to close when the gas concentration is abnormal, achieving a rapid and safe response. Simultaneously, the buzzer, transistor, and ferrite bead components in the alarm module 40, along with filtering and interference suppression circuits, ensure accurate and reliable audible and visual alarms. The communication module 50 connects to the control chip via a serial port and uses a reset pin to control power supply, achieving stability and reliability in remote information transmission. The overall structure of this invention enables the device to maintain high reliability and safety under low power consumption conditions, ensuring efficient operation of the household combustible gas monitoring, alarm, and information feedback functions.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A household combustible gas detection device, characterized in that, It includes a power module, and a data acquisition module, a control module, a communication module and an alarm module that are electrically connected to the power module respectively; The acquisition module is also connected to the control module and is used to acquire the concentration signal of the household combustible gas and output it to the control module. The control module is used to send a disconnection control signal when the concentration signal is lower than a preset threshold, and to send a control signal and an alarm signal when the concentration signal reaches the preset threshold. The communication module and alarm module are respectively connected to the control module and are used to disconnect from the power module when the disconnection control signal is received, so that the power module only supplies power to the acquisition module and the control module. The communication module is also used to send the operating status and alarm information of the household combustible gas detection device to the remote platform when the control signal is received; The alarm module is also used to execute an audible and visual alarm when the alarm signal is received.

2. The household combustible gas detector according to claim 1, characterized in that, The power module includes a first power unit and a second power unit that are connected to each other. The first power supply unit is used to convert the input voltage into a first voltage to supply power to the acquisition module and the alarm module; The second power supply unit is used to convert the first voltage into a second voltage to supply power to the control module and the communication module.

3. The household combustible gas detector according to claim 2, characterized in that, The control module includes a first chip and a Bluetooth unit that are interconnected. The first chip is used to send a trigger signal to control the Bluetooth unit to work when the concentration signal reaches the preset threshold. The Bluetooth unit is connected to the antenna via its RFIOP pin, and is used to transmit concentration information data to an external receiving device in the form of radio frequency signals. The Bluetooth unit is also used to send a control command to the matched external gas meter via the Bluetooth communication protocol after receiving the trigger signal. The external gas meter responds to the control command by driving its internal electronically controlled valve to close and cut off the output of combustible gas.

4. The household combustible gas detector according to claim 3, characterized in that, The Bluetooth unit includes inductor L3, inductor L4, capacitor C22, capacitor C24, bidirectional diode D5, and antenna interface RF1; The first end of the inductor L3 is connected to the RFIOP pin, and the second end is connected to the antenna interface RF1 in sequence through the capacitor C22 and the inductor L4; One end of the capacitor C24 is connected to the second end of the inductor L3, and the other end of the capacitor C24 is grounded. One end of the bidirectional diode D5 is connected between the inductor L4 and the antenna interface RF1, and the other end of the bidirectional diode D5 is grounded.

5. The household combustible gas detector according to claim 3, characterized in that, The first chip also has PB4 / U2TX pins and PB5 / U2RX pins; The communication module includes a second chip, which has an RXD pin and a TXD pin. The RXD pin is connected to the PB4 / U2TX pin, and the TXD pin is connected to the PB5 / U2RX pin.

6. The household combustible gas detector according to claim 5, characterized in that, The first chip also has a PB13 pin, and the second chip also has a RESET pin, which is connected to the PB13 pin.

7. The household combustible gas detector according to claim 3, characterized in that, The first chip also has a PB0 pin; The alarm module includes resistor R28, resistor R29, transistor Q4, diode D9, and buzzer LS1; The first end of the resistor R28 is connected to the PB0 pin, and the second end is connected to the base of the transistor Q4; One end of the resistor R29 is connected to the base of the transistor Q4, and the other end is grounded; The first terminal of the buzzer LS1 is connected to the second terminal of the buzzer LS1 via the diode D9; The collector of the transistor Q4 is connected to the second terminal of the buzzer LS1, and the emitter is grounded.

8. The household combustible gas detector according to claim 7, characterized in that, The alarm module also includes a magnetic bead B2 and a capacitor C40; The first end of the magnetic bead B2 is connected to the first power supply unit, and the second end is grounded through the capacitor C40. The second end of the magnetic bead B2 is also connected to the first end of the buzzer LS1.

9. The household combustible gas detector according to claim 3, characterized in that, The acquisition module includes sensor U7, resistor R22 and resistor RL1; The first pin of the sensor U7 is grounded through the resistor RL1, the second pin is connected to the power module, the third pin is connected to the first pin of the sensor U7, the fourth and sixth pins are both connected to the power module, and the fifth pin is grounded. The resistor R22 is connected in parallel with the resistor RL1.

10. The household combustible gas detector according to claim 9, characterized in that, The acquisition module also includes resistors R20 and R21 and capacitor C35; The first end of the resistor R20 is connected to the first pin of the sensor U7, and the second end of the resistor R20 is connected to the PB10 / ADC1 pin of the first chip. The first terminals of resistor R21 and capacitor C35 are both connected to the second terminal of resistor R20, and the second terminals of resistor R21 and capacitor C35 are grounded.

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