Low-power-consumption high-stability methane sensor

Abstract

The utility model belongs to the technical field of methane sensors, and particularly relates to a low-power-consumption high-stability methane sensor. Comprising a control module, a charging and voltage stabilizing module, a detection module and an LORA module which are matched with one another. Wherein a voltage stabilizing circuit design is adopted in the charging and voltage stabilizing module, and the charging and voltage stabilizing module is used for supplying power to a rechargeable battery. The detection module comprises a laser probe and is used for methane concentration detection. And the LORA technology is introduced into the LORA module. Therefore, the utility model has the technical advantages of high detection stability and low power consumption.

Description

Technical Field

[0001] This utility model relates to the field of methane sensor technology, specifically to a low-power, high-stability methane sensor. Background Technology

[0002] Methane sensors are widely used in underground mining scenarios and are of great practical significance in ensuring the safety of personnel working underground.

[0003] The existing general methane sensor has the following structure and working process: it detects the methane concentration in the environment based on a catalytic element, then converts the detected methane concentration into a weak signal according to a preset ratio, and after a series of signal amplification, conversion and processing, it is transmitted to the control terminal via a wired transmission channel.

[0004] However, the aforementioned methane sensors still have the following drawbacks in practical applications: Firstly, because they use catalytic elements for concentration detection, these elements are easily affected by environmental factors, leading to changes in detection stability over time and with environmental variations. Secondly, wired transmission not only suffers from reliability issues due to environmental influences but also exhibits poor anti-interference capabilities and high power consumption during long-distance transmission downhole. Therefore, existing methane sensors cannot fully and effectively guarantee personnel safety in practical applications. Utility Model Content

[0005] The purpose of this invention is to provide a low-power, high-stability methane sensor to improve the technical problems of existing methane sensors in terms of stability and power consumption.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] A low-power, high-stability methane sensor includes a control module, a charging and voltage regulation module, a detection module, and a LORA module that work together.

[0008] The control module includes: an MCU chip U6;

[0009] The charging and voltage regulation module includes: a power switch J1, a battery terminal J2, a charging port J3, a DC-DC power chip U4, a field-effect transistor Q9, a reverse polarity protection diode D1, a TVS diode D6, a reverse polarity protection diode D7, a reverse polarity protection diode D8, a fuse F1, a fuse F3, a transistor Q1, a transistor Q3, resistors R8, R2, R19, R12, R13, R9, R10, capacitors C7, C5, C6, C3, C4, and an inductor L1; wherein, pin 1 of the charging port J3, the reverse polarity protection diode D8, the reverse polarity protection diode D7, and the fuse... F3 is connected in series; pin 2 of the charging port J3 is connected in parallel with pin 2 of the battery terminal J2 and then grounded; the unused end of the fuse F3 is simultaneously electrically connected to pin 1 of the battery terminal J2, pin 1 of the power switch J1, pins 1, 2, and 3 of the MOSFET Q9, and one end of the resistor R12; pin 2 of the power switch J1 is simultaneously electrically connected to the resistor R8 and the reverse polarity protection diode D1; the unused end of the resistor R8 is simultaneously electrically connected to pin 1 of the transistor Q1 and one end of the resistor R19, and the unused end of the resistor R19 is connected to pin 2 of the transistor Q1. The transistor Q1 is grounded at the same time. Pin 3 of the transistor Q1 is connected to the MCU chip U6 for communication and is connected to an external power supply via resistor R2. The unused terminal of the reverse polarity protection diode D1 is electrically connected to pins 5, 6, 7, and 8 of the field-effect transistor Q9 and fuse F1. Pin 4 of the field-effect transistor Q9 is electrically connected to pin 3 of the transistor Q3 and is connected to pin 1 of the battery terminal J2 via resistor R12. Pin 2 of the transistor Q3 is grounded, and pin 1 is connected to the MCU chip U6 via resistor R13. Resistors R9 and R10 are connected in series to the T... VSS transistor D6, capacitor C5, and capacitor C6 are connected in parallel, with one end of this parallel structure electrically connected to the unused terminal of fuse F1 and simultaneously connected to the VIN, VINA, EN, and PS / SYNC pins of power chip U4, while the other end is grounded; one end of capacitor C7 is electrically connected to the connection terminals of resistors R9 and R10, while the other end is grounded; the L1 and L2 pins of power chip U4 are electrically connected to both ends of inductor L1; one end of capacitors C3 and C4 connected in parallel is connected to an external power supply and connected to the VOUT and FB pins of power chip U4, while the other end is grounded;

[0010] The detection module includes a laser probe J5, which is communicatively connected to the MCU chip U6.

[0011] The LORA module includes a LORA chip U1, capacitors C2 and C3, and an antenna T1. Capacitors C2 and C3 are connected in parallel, with one end connected to the GND pin of the LORA chip U1 and grounded, and the other end connected to the VCC pin of the LORA chip U1 and then connected to an external power supply. The antenna T1 is electrically connected to the RF pin of the LORA chip U1.

[0012] Furthermore, the model number of the MCU chip U6 is: STM32F103CBT6.

[0013] Furthermore, the LORA chip U1 is model LSD4RF-2F917N10.

[0014] Furthermore, the DC-DC power chip U4 is model TPS63001DRCR.

[0015] Furthermore, this includes a buzzer module;

[0016] The buzzer module includes: a boost converter chip U5, resistors R15, R14, R18, R16, and R17, capacitors C8, C18, and C19, a diode D19, a fuse F2, a transistor Q4, and a buzzer interface J4. The VIN pin of the boost converter chip U5 is electrically connected to one end of resistor R15, inductor L2, and capacitor C8, and then connected to an external power supply. The EN pin of the boost converter chip U5 is electrically connected to the other end of resistor R15. The GND pin of the boost converter chip U5 is electrically connected to the other end of capacitor C8 and then grounded. The SW pin of the boost converter chip U5 is electrically connected to the other end of inductor L2 and the positive terminal of diode D19. The FB pin of the boost chip U5 is electrically connected to resistors R14 and R18, and capacitor C19. The cathode of diode D19 is electrically connected to an external power supply and connected to pin 1 of the buzzer interface J4 via fuse F2. The other end of resistor R14 is connected to an external power supply via resistor R16. The other end of capacitor C19 is connected to an external power supply. The other end of resistor R18 is connected to an external power supply via capacitor C18. Pin 2 of the buzzer interface J4 is electrically connected to pin 3 of transistor Q4. Pin 2 of transistor Q4 is electrically connected, and pin 1 of transistor Q4 is connected to the MCU chip U6 via resistor R17.

[0017] Furthermore, this includes the display module;

[0018] The display module includes a 4-digit high-brightness LED display, a communication chip U3, resistors R29 and R36; wherein, the DSB and DSA pins of the communication chip U3 are connected to the MCU chip U6 via resistor R36; the CLK pin of the communication chip U3 is connected to the MCU chip U6 via resistor R29; the MR pin of the communication chip U3 is connected to an external power supply; and the remaining communication pins of the communication chip U3 are communicatively connected to the 4-digit high-brightness LED display.

[0019] Furthermore, this includes an infrared remote control module;

[0020] The infrared remote control module includes: an infrared chip U2, a resistor R1, and a resistor R3; wherein, the VS pin of the infrared chip U2 is connected to an external power supply through the resistor R1; the OUT pin of the infrared chip U2 is connected to an external power supply through the resistor R3 and is communicatively connected to the MCU chip U6; the GND pin of the infrared chip U2 is grounded.

[0021] Furthermore, this includes the first button module;

[0022] The first button module includes: a resistor R20, a button S1, and a capacitor C9; wherein, the button S1 includes a DEF terminal and a TSH terminal; wherein, one end of the capacitor C9 is connected to an external power supply through the resistor R20, and the other end is grounded; the button S1 and the capacitor C9 are connected in parallel, and the DEF terminal is connected to the MCU chip U6, and the TSH terminal is grounded.

[0023] Furthermore, this includes a second button module;

[0024] The second button module includes: a resistor R21, a button S2, and a capacitor C10; wherein, the button S2 includes a RESET terminal and a TSH terminal; wherein, one end of the capacitor C10 is connected to an external power supply through the resistor R21, and the other end is grounded; the button S2 and the capacitor C10 are connected in parallel, and the RESET terminal is connected to the MCU chip U6, and the TSH terminal is grounded.

[0025] Furthermore, this includes indicator light modules;

[0026] The indicator module includes: a running indicator D11, an alarm indicator D12, a data indicator D13, a link indicator D14, a current-limiting resistor R22, a current-limiting resistor R24, a current-limiting resistor R25, and a current-limiting resistor R26; wherein, one end of the running indicator D11 is grounded, and the other end is connected to the MCU chip U6 via the current-limiting resistor R22; one end of the running indicator D12 is grounded, and the other end is connected to the MCU chip U6 via the current-limiting resistor R24; one end of the running indicator D13 is grounded, and the other end is connected to the MCU chip U6 via the current-limiting resistor R25; one end of the running indicator D14 is grounded, and the other end is connected to the MCU chip U6 via the current-limiting resistor R26.

[0027] Beneficial effects:

[0028] (1) This technical solution uses a laser probe for methane concentration detection. Since it is based on tunable laser absorption spectroscopy, it can accurately measure the methane concentration and is not affected by external factors such as ambient temperature and humidity, thus having high measurement accuracy, stability, and anti-interference capabilities. At the same time, since its working principle is not affected by the catalytic element, there is no need to frequently replace the catalytic element; therefore, it also has a longer calibration cycle, lower maintenance costs, and a longer service life.

[0029] (2) This technical solution sets up a LORA module to realize wireless communication transmission, which not only has the advantage of low power consumption to meet the needs of long-distance communication in the mine, but also does not require wiring, thus avoiding communication abnormalities caused by objective environmental factors (such as signal line breakage caused by tunnel collapse).

[0030] (3) This technical solution is equipped with a charging and voltage stabilization module, which improves the power supply stability. This not only improves the safety of the methane sensor when used in the dangerous environment of underground mines, but also achieves high stability detection of methane concentration.

[0031] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0032] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0033] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0034] Figure 1 This is a circuit topology diagram of the low-power, high-stability methane sensor described in this embodiment;

[0035] Figure 2 Here is the circuit diagram of the control module;

[0036] Figure 3 The circuit diagram for the charging and voltage regulation module is shown below.

[0037] Figure 4 The circuit diagram of the detection module

[0038] Figure 5 Here is the circuit diagram of the LORA module;

[0039] Figure 6 Here is the circuit diagram of the buzzer module;

[0040] Figure 7 This is a circuit diagram of the display module;

[0041] Figure 8 Here is the circuit diagram of the infrared remote control module;

[0042] Figure 9 Here is the circuit diagram of the button module;

[0043] Figure 10 This is the circuit diagram of the indicator light module. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0045] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0046] Conventional methane sensors detect methane concentrations in the environment based on catalytic elements and report the data to the control unit via a wired transmission channel. Therefore, in practical applications, they are prone to problems such as poor detection stability, high power consumption, and poor interference resistance. Based on this, this embodiment aims to provide a low-power, highly stable methane sensor to improve upon the aforementioned technical shortcomings.

[0047] The low-power, high-stability methane sensor disclosed in this utility model will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0048] like Figures 1-5 As shown, the methane sensor described in this embodiment includes a control module, a charging and voltage regulation module, a detection module, and a LORA module that work together.

[0049] The control module includes an MCU chip U6. In this embodiment, the MCU chip U6 is an STM32F103CBT6.

[0050] The charging and voltage regulation module includes: a power switch J1, a battery terminal J2, a charging port J3, a DC-DC power chip U4, a field-effect transistor Q9, a reverse polarity protection diode D1, a TVS diode D6, a reverse polarity protection diode D7, a reverse polarity protection diode D8, a fuse F1, a fuse F3, a transistor Q1, a transistor Q3, resistors R8, R2, R19, R12, R13, R9, R10, capacitors C7, C5, C6, C3, C4, and an inductor L1; wherein, pin 1 of the charging port J3, the reverse polarity protection diodes D8 and D7, and the fuse F3... The components are connected in series; pin 2 of the charging port J3 is connected in parallel with pin 2 of the battery terminal J2 and then grounded; the unused terminal of the fuse F3 is simultaneously electrically connected to pin 1 of the battery terminal J2, pin 1 of the power supply switch J1, pins 1, 2, and 3 of the MOSFET Q9, and one end of the resistor R12; pin 2 of the power supply switch J1 is simultaneously electrically connected to the resistor R8 and the reverse polarity protection diode D1; the unused terminal of the resistor R8 is simultaneously electrically connected to pin 1 of the transistor Q1 and one end of the resistor R19, and the unused terminal of R19 is simultaneously grounded to pin 2 of the transistor Q1. Pin 3 of transistor Q1 is communicatively connected to pin PC13 of MCU chip U6 and connected to an external power supply via resistor R2; the unused terminal of anti-reverse diode D1 is electrically connected to pins 5, 6, 7, and 8 of MOSFET Q9 and fuse F1; pin 4 of MOSFET Q9 is electrically connected to pin 3 of transistor Q3 and connected to pin 1 of battery terminal J2 via resistor R12; pin 2 of transistor Q3 is grounded, and pin 1 is connected to pin PB9 of MCU chip U6 via resistor R13; resistors R9 and R10 are connected in series... The following components are connected in parallel: TVS diode D6, capacitor C5, and capacitor C6, with one end of the parallel structure electrically connected to the unused terminal of fuse F1 and simultaneously connected to the VIN, VINA, EN, and PS / SYNC pins of power chip U4, and the other end grounded; one end of capacitor C7 is electrically connected to the connection terminals of resistors R9 and R10, and the other end grounded; the L1 and L2 pins of power chip U4 are electrically connected to the two ends of inductor L1 respectively; one end of capacitors C3 and C4 connected in parallel is connected to an external power supply and connected to the VOUT and FB pins of power chip U4, and the other end grounded.

[0051] In this embodiment, the DC-DC power chip U4 is model TPS63001DRCR, which can ensure that the device works normally in a low voltage environment, realize long-distance power supply, and meet the low power consumption operation of the methane sensor.

[0052] In specific implementation, when the power supply switch J1 is closed, the external power supply outputs 3.3V, the PB9 pin of the MCU chip U6 outputs a high level, and the 1st pin of the transistor Q3 is continuously conducting under the action of the high level. At this time, the 4th pin of the field-effect transistor Q9 is also set to a low level, and the battery continues to supply power to complete the power-on action. In the power-on state, the PC13 pin of the MCU chip U6 detects a high level input. When the power supply switch J1 is closed again, the PC13 pin of the MCU chip U6 detects a low level input. At this time, the PB9 pin of the MCU chip U6 outputs a low level, the transistor Q3 and the field-effect transistor Q9 are cut off, the battery stops supplying power to complete the power-off action.

[0053] The detection module includes a laser probe J5, which is communicatively connected to the MCU chip U6. Specifically, the laser probe J5 is connected to the PB10 and PB11 pins of the MCU chip U6 via a 4-pin terminal.

[0054] The LORA module includes a LORA chip U1, capacitors C2 and C3, and an antenna T1. Capacitors C2 and C3 are connected in parallel, with one end connected to the GND pin of the LORA chip U1 and grounded, and the other end connected to the VCC pin of the LORA chip U1 and connected to a 3.3V external power supply. The antenna T1 is electrically connected to the RF pin of the LORA chip U1. In this embodiment, the LORA chip U1 is model LSD4RF-2F917N10.

[0055] like Figure 6 As shown, to facilitate abnormal alarms, the methane sensor also includes a buzzer module. Specifically, the buzzer module includes: a boost converter chip U5, resistors R15, R14, R18, R16, and R17, capacitors C8, C18, and C19, a diode D19, a fuse F2, a transistor Q4, and a buzzer interface J4.

[0056] In specific connections, the VIN pin of the boost chip U5 is electrically connected to one end of the resistor R15, the inductor L2, and the capacitor C8, and then connected to a 3.3V external power supply; the EN pin of the boost chip U5 is electrically connected to the other end of the resistor R15; the GND pin of the boost chip U5 is electrically connected to the other end of the capacitor C8 and then grounded; the SW pin of the boost chip U5 is electrically connected to the other end of the inductor L2 and the positive terminal of the diode D19; the FB pin of the boost chip U5 is electrically connected to the resistor R14, the resistor R18, and the capacitor C19; the diode D19... The negative terminal of the resistor R14 is electrically connected to a 5.5V external power supply and is connected to pin 1 of the buzzer interface J4 via the fuse F2; the other end of the resistor R14 is connected to a 5.5V external power supply via the resistor R16; the other end of the capacitor C19 is connected to a 5.5V external power supply; the other end of the resistor R18 is connected to a 5.5V external power supply via the capacitor C18; pin 2 of the buzzer interface J4 is electrically connected to pin 3 of the transistor Q4; pin 2 of the transistor Q4 is electrically connected, and pin 1 of the transistor Q4 is connected to pin PA2 of the MCU chip U6 via the resistor R17.

[0057] In practical implementation, when the PA2 pin of the MCU chip U6 outputs a high level, the transistor Q4 is turned on and the buzzer sounds; when the PA2 pin outputs a low level, the transistor Q4 is not turned on and the buzzer does not sound, thus realizing the sensor alarm function.

[0058] like Figure 7 As shown, to facilitate methane concentration display, the methane sensor also includes a display module. Specifically, the display module includes a 4-digit high-brightness LED display, a communication chip U3, resistors R29 and R36. The DSB and DSA pins of the communication chip U3 are connected to the PA12 pin of the MCU chip U6 via resistor R36; the CLK pin of the communication chip U3 is connected to the PA11 pin of the MCU chip U6 via resistor R29; the MR pin of the communication chip U3 receives a 3.3V external power supply; the remaining communication pins of the communication chip U3 are communicatively connected to the 4-digit high-brightness LED display. In this embodiment, the communication chip U3 is an SN74HC164DR type communication chip.

[0059] Furthermore, such as Figure 8As shown, the methane sensor in this embodiment also includes an infrared remote control module. The infrared remote control module includes: an infrared chip U2, resistor R1, and resistor R3. The VS pin of the infrared chip U2 is connected to a 3.3V external power supply through resistor R1; the OUT pin of the infrared chip U2 is connected to a 3.3V external power supply through resistor R3 and is communicatively connected to the PA15 pin of the MCU chip U6; the GND pin of the infrared chip U2 is grounded.

[0060] like Figure 9 As shown, to facilitate button control, the methane sensor includes a button module, specifically a first button module and a second button module. The first button module is used to perform a factory reset function. It includes: resistor R20, button S1, and capacitor C9; wherein, button S1 includes a DEF terminal and a TSH terminal. In specific connections, one end of capacitor C9 is connected to a 3.3V external power supply via resistor R20, and the other end is grounded; button S1 is connected in parallel with capacitor C9, and the DEF terminal is connected to the PA0 pin of the MCU chip U6, while the TSH terminal is grounded. The second button module is used to perform a reset function. It includes: resistor R21, button S2, and capacitor C10; wherein, button S2 includes a RESET terminal and a TSH terminal. In specific connections, one end of capacitor C10 is connected to a 3.3V external power supply via resistor R21, and the other end is grounded; button S2 is connected in parallel with capacitor C10, and the RESET terminal is connected to the NRST pin of the MCU chip U6, while the TSH terminal is grounded.

[0061] In practical implementation, when button S1 is not pressed, MCU chip U6 detects that the button circuit is at a high level and MCU chip U6 operates normally; when button S1 is pressed, MCU chip U6 is reset and then restarts; when button S2 is not pressed, MCU chip U6 detects that the button circuit is at a high level and MCU chip U6 does not respond; when button S2 is pressed continuously for more than 5 seconds, all sensor parameters will be restored to factory default values.

[0062] To facilitate the display of the methane sensor's status, such as Figure 10 As shown, the setup also includes an indicator light module.

[0063] Specifically, the indicator module includes: a running indicator D11, an alarm indicator D12, a data indicator D13, a link indicator D14, current-limiting resistors R22, R24, R25, and R26. One end of the running indicator D11 is grounded, and the other end is connected to the PA8 pin of the MCU chip U6 via the current-limiting resistor R22; one end of the running indicator D12 is grounded, and the other end is connected to the PB15 pin of the MCU chip U6 via the current-limiting resistor R24; one end of the running indicator D13 is grounded, and the other end is connected to the PB8 pin of the MCU chip U6 via the current-limiting resistor R25; one end of the running indicator D14 is grounded, and the other end is connected to the PB7 pin of the MCU chip U6 via the current-limiting resistor R26.

[0064] In specific implementation, the indicator light illuminates when the control pin of the MCU chip U6 outputs a high level, and turns off when the control pin of the MCU chip U6 outputs a low level. When the MCU chip U6 is operating normally, the operation indicator light D11 flashes at a frequency of 1Hz. When the sensor alarms, the alarm indicator light D12 flashes at a frequency of 0.5Hz controlled by the PB15 pin of the MCU chip U6. When the sensor wirelessly reports sensor data, the data indicator light D13 illuminates when the PB8 pin of the MCU chip U6 outputs a high level, and turns off when the sensor reports no data. When the sensor can communicate normally with the monitoring substation, the link indicator light D15 remains constantly illuminated when the sensor cannot communicate normally with the monitoring substation, and turns off when the PB7 pin of the MCU chip U6 remains constantly extinguished. These indicator lights display the local status of the sensor.

[0065] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A low-power, high-stability methane sensor, characterized by, The control module, the charging and voltage stabilizing module, the detection module and the LORA module are matched with each other. The control module comprises an MCU chip U6. The charging and voltage stabilizing module comprises a power supply switch J1, a battery terminal J2, a charging port J3, a DCDC power supply chip U4, a field effect transistor Q9, an anti-reverse connection diode D1, a TVS tube D6, an anti-reverse connection diode D7, an anti-reverse connection diode D8, a fuse F1, a fuse F3, a triode Q1, a triode Q3, a resistor R8, a resistor R2, a resistor R19, a resistor R12, a resistor R13, a resistor R9, a resistor R10, a capacitor C7, a capacitor C5, a capacitor C6, a capacitor C3, a capacitor C4 and an inductor L1. The No.1 pin of the charging port J3, the anti-reverse connection diode D8, the anti-reverse connection diode D7 and the fuse F3 are connected in series. The No.2 pin of the charging port J3 and the No.2 pin of the battery terminal J2 are connected in parallel and then grounded. The free end of the fuse F3 is electrically connected with the No.1 pin of the battery terminal J2, the No.1 pin of the power supply switch J1, the No.1 pin, the No.2 pin and the No.3 pin of the field effect transistor Q9 and one end of the resistor R12. The No.2 pin of the power supply switch J1 is electrically connected with the resistor R8 and the anti-reverse connection diode D1. The free end of the resistor R8 is electrically connected with the No.1 pin of the triode Q1 and one end of the resistor R19. The free end of the resistor R19 is grounded. The No.2 pin of the triode Q1 is in communication connection with the MCU chip U6 and is connected with an external power supply through the resistor R2. The free end of the anti-reverse connection diode D1 is electrically connected with the No.5 pin, the No.6 pin, the No.7 pin and the No.8 pin of the field effect transistor Q9 and the fuse F1. The No.4 pin of the field effect transistor Q9 is electrically connected with the No.3 pin of the triode Q3 and the No.1 pin of the battery terminal J2 through the resistor R12. The No.2 pin of the triode Q3 is grounded. The No.1 pin of the triode Q3 is connected with the MCU chip U6 through the resistor R13. The resistor R9 and the resistor R10 are connected in series and are connected in parallel with the TVS tube D6, the capacitor C5 and the capacitor C6. One end of the parallel structure is electrically connected with the free end of the fuse F1 and is connected with the VIN pin, the VINA pin, the EN pin and the PS / SYNC pin of the power supply chip U4. The other end is grounded. One end of the capacitor C7 is electrically connected with the connection end of the resistor R9 and the resistor R10. The other end is grounded. The L1 pin and the L2 pin of the power supply chip U4 are respectively electrically connected with the two ends of the inductor L1. The capacitor C3 and the capacitor C4 are connected in parallel and are connected with an external power supply. The parallel structure is connected with the VOUT pin and the FB pin of the power supply chip U4. The other end is grounded. The detection module comprises a laser probe J5. The laser probe J5 is in communication connection with the MCU chip U6. The LORA module comprises a LORA chip U1, a capacitor C2, a capacitor C3 and an antenna T1; wherein the capacitor C2 and the capacitor C3 are connected in parallel, one end of which is connected to the GND pin of the LORA chip U1 and grounded, and the other end is connected to the VCC pin of the LORA chip U1 and connected to an external power supply; the antenna T1 is electrically connected to the RF pin of the LORA chip U1.

2. The low power consumption, high stability methane sensor according to claim 1, wherein, The model of the MCU chip U6 is STM32F103CBT6.

3. The low power consumption, high stability methane sensor according to claim 1, wherein, The model of the LORA chip U1 is LSD4RF-2F917N10.

4. The low power consumption, high stability methane sensor of claim 1, wherein, The model of the DCDC power supply chip U4 is TPS63001DRCR.

5. The low power consumption, high stability methane sensor according to claim 1, wherein, The buzzer module comprises a boost chip U5, a resistor R15, a resistor R14, a resistor R18, a resistor R16, a resistor R17, a capacitor C8, a capacitor C18, a capacitor C19, a diode D19, a fuse F2 and a transistor Q4. The buzzer interface J4; wherein the VIN pin of the boost chip U5 is electrically connected to the resistor R15, the inductor L2 and one end of the capacitor C8, and then connected to an external power supply; the EN pin of the boost chip U5 is electrically connected to the other end of the resistor R15; the GND pin of the boost chip U5 is electrically connected to the other end of the capacitor C8 and grounded; the SW pin of the boost chip U5 is electrically connected to the other end of the inductor L2 and the anode of the diode D19; the FB pin of the boost chip U5 is electrically connected to the resistor R14, the resistor R18 and the capacitor C19; the cathode of the diode D19 is electrically connected to an external power supply and connected to the No.1 pin of the buzzer interface J4 through the fuse F2; the other end of the resistor R14 is connected to an external power supply through the resistor R16; the other end of the capacitor C19 is connected to an external power supply; the other end of the resistor R18 is connected to an external power supply through the capacitor C18; the No.2 pin of the buzzer interface J4 is electrically connected to the No.3 pin of the transistor Q4; the No.2 pin of the transistor Q4 is electrically connected, and the No.1 pin of the transistor Q4 is connected to the MCU chip U6 through the resistor R17.

6. The low power consumption, high stability methane sensor of claim 1, wherein, The display module comprises a 4-bit high-brightness nixie tube, a communication chip U3, a resistor R29 and a resistor R36; wherein the DSB pin and the DSA pin of the communication chip U3 are connected to the MCU chip U6 through the resistor R36; the CLK pin of the communication chip U3 is connected to the MCU chip U6 through the resistor R29; the MR pin of the communication chip U3 is connected to an external power supply; and the remaining communication pins of the communication chip U3 are in communication connection with the 4-bit high-brightness nixie tube. The infrared remote control module comprises an infrared receiving module and an infrared decoding module.

7. The low power consumption, high stability methane sensor of claim 1, wherein, ​ The infrared remote control module comprises an infrared chip U2, a resistor R1 and a resistor R3; wherein the VS pin of the infrared chip U2 is connected to an external power supply through the resistor R1; the OUT pin of the infrared chip U2 is connected to an external power supply through the resistor R3 and is in communication connection with the MCU chip U6; and the GND pin of the infrared chip U2 is grounded.

8. The low power consumption, high stability methane sensor of claim 1, wherein, The first key module is comprised; The first key module comprises a resistor R20, a key S1 and a capacitor C9; wherein the key S1 comprises a DEF end and a TSH end; one end of the capacitor C9 is connected to an external power supply through the resistor R20, and the other end is grounded; the key S1 is in parallel connection with the capacitor C9, the DEF end is connected to the MCU chip U6, and the TSH end is grounded.

9. The low power consumption, high stability methane sensor of claim 1, wherein, The second key module is comprised; The second key module comprises a resistor R21, a key S2 and a capacitor C10; wherein the key S2 comprises a RESET end and a TSH end; one end of the capacitor C10 is connected to an external power supply through the resistor R21, and the other end is grounded; the key S2 is in parallel connection with the capacitor C10, the RESET end is connected to the MCU chip U6, and the TSH end is grounded.

10. The low power consumption, high stability methane sensor of claim 1, wherein, The indication lamp module is comprised; The indication lamp module comprises a running indication lamp D11, an alarm indication lamp D12, a data indication lamp D13, a link indication lamp D14, current limiting resistors R22, R24, R25 and R26; wherein one end of the running indication lamp D11 is grounded, and the other end is connected to the MCU chip U6 through the current limiting resistor R22; one end of the running indication lamp D12 is grounded, and the other end is connected to the MCU chip U6 through the current limiting resistor R24; one end of the running indication lamp D13 is grounded, and the other end is connected to the MCU chip U6 through the current limiting resistor R25; one end of the running indication lamp D14 is grounded, and the other end is connected to the MCU chip U6 through the current limiting resistor R26.

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