CN209961280U

CN209961280U - NB-IoT (network B-IoT) Internet of things gas meter

Info

Publication number: CN209961280U
Application number: CN201920546625.6U
Authority: CN
Inventors: 黄嘉伟; 张建
Original assignee: Youat Instrument Technology Chengdu Co Ltd
Current assignee: Youat Instrument Technology Chengdu Co Ltd
Priority date: 2019-04-21
Filing date: 2019-04-21
Publication date: 2020-01-17
Anticipated expiration: 2029-04-21

Abstract

The utility model discloses a NB-IoT gas meter, which comprises a signaling gas meter, a valve driver, a controller and a counter; the controller comprises an MCU, a sampling module, a valve control module, a power supply module, a clock module, a communication power supply control module, a communication module, an SIM card and a radio frequency antenna, wherein the MCU is respectively in communication connection with the sampling module, the valve control module, the clock module, the communication power supply control module and the communication module; the utility model provides a can not long-range meter reading, the practicality of prior art existence low, the construction is difficult, the cost drops into high, the signal covers not good and the high problem of consumption.

Description

NB-IoT (network B-IoT) Internet of things gas meter

Technical Field

The utility model belongs to the technical field of the gas measurement, concretely relates to NB-IoT thing networking gas table.

Background

The internet of things gas meter is a remote gas meter applying the internet of things technology, and is a latest generation remote gas meter. The meter has the remarkable characteristics that the comprehensive cost is very low, particularly the installation cost is the same as that of a common mechanical gas meter, the meter can be operated only by installing the meter on a pipeline without field operations such as punching, wiring and the like, all debugging is completely finished at a computer terminal, and the meter is popularized in China simply and conveniently. The Internet of things gas meter is simple and easy to delete, no intermediate link exists from the meter end to the cloud end, only one meter problem occurs even if the problem occurs, and the maintenance and operation cost can be reduced to the lowest.

NB-IoT (cellular-based narrowband internet of things) is an emerging technology in the IoT field, supporting cellular data connectivity for low-power devices over wide area networks. NB-IoT supports efficient connectivity for devices with long standby time and high requirements for network connectivity.

As a technique applied to low-rate traffic, NB-IoT has the following advantages:

(1) strong linking: with the same base station, NB-IoT may provide 50-100 times the number of connections over existing wireless technologies. One sector can support 10 ten thousand connections, and support low latency sensitivity, ultra-low device cost, low device power consumption, and an optimized network architecture.

(2) High coverage: the NB-IoT indoor coverage capability is strong, the gain is improved by 20dB compared with that of LTE, and the capability of the coverage area is improved by 100 times. The system can meet the wide coverage requirement in rural areas, and is also suitable for application scenes with requirements on deep coverage, such as factories, pipeline wells, underground garages and well covers.

(3) Low power consumption: the low power consumption characteristic is an important index of the application of the Internet of things, and particularly for some equipment and occasions where batteries cannot be replaced frequently, such as gas meters arranged in remote areas of wildlands, the equipment and the occasions cannot be charged like smart phones one day, and the service life of the batteries is the most essential requirement for years. NB-IoT focuses on small data volume, low rate applications, so NB-IoT device power consumption can be made very small, and device endurance can be greatly extended.

(4) The cost is low: compared with LoRa, NB-IoT does not need to be re-networked, and radio frequency and antenna are basically multiplexed. The low speed, low power consumption, low bandwidth also bring the advantage of low cost to NB-IoT chips and modules.

(5) The anti-interference capability is strong: the payment authorization frequency band adopted by the NB-IoT internet of things is free from interference of other similar equipment, stable in working performance and strong in anti-interference performance

The traditional gas meter can not meet the existing use requirements, the problems existing in the gas supply industry at present can not be solved, and the reliability, timeliness and effectiveness of data transmission can be guaranteed by using the Internet of things gas meter. With the application of the NB-IoT technology, the problems of signal coverage and power consumption are effectively solved. At present, in the gas supply industry, the application of NB-IoT gas meters becomes the key point of research.

The prior art has the following problems:

(1) the traditional IC card meter cannot be remotely read, and has low practicability;

(2) the traditional wired remote transmitting meter is difficult to construct and high in cost investment;

(3) the signal coverage is not good, and the power consumption is high.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned not enough among the prior art, the utility model provides a pair of practicality is high, the cost drops into low, the signal covers good and the low-power consumption NB-IoT thing networking gas table for solve the problem that can not long-rangely check meter, the practicality is low, the construction is difficult, the cost drops into high, the signal covers not good and the high-power consumption of prior art existence.

In order to achieve the above object, the utility model adopts the following technical scheme:

an NB-IoT (network B-IoT) gas meter comprises a signaling gas meter, a valve driver, a controller and a counter, wherein the valve driver is positioned inside the controller and is respectively in communication connection with the controller and the valve;

the controller includes MCU, the sampling module, valve control module, power module, clock module, communication power supply control module, communication module, SIM card and radio frequency antenna, MCU respectively with the sampling module, valve control module, clock module, communication power supply control module and communication module communication connection, power module respectively with MCU, valve control module, clock module and communication power supply control module electric connection, communication module respectively with communication power supply control module, SIM card and radio frequency antenna communication connection, valve control module and valve driver communication connection, sampling module and counter communication connection.

Furthermore, a mechanical transmission device, a mechanical character wheel and a signaling sensor are arranged inside the counter, the mechanical transmission device is movably connected with the mechanical character wheel, an electromagnet is arranged at the contact part of the mechanical transmission device and the mechanical character wheel, and two ends of the signaling sensor are respectively in communication connection with the electromagnet and the controller.

Further, the communication module is an NB-IoT communication module.

Furthermore, the model of the main control chip U2 of the NB-IoT communication module is M5310, and a capacitor bank is connected between the VBAT pin and the GND pin of the main control chip U2, the capacitor bank includes a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4 connected in parallel, the RESET pin of the main control chip U2 is connected with a resistor R1 and a capacitor C5 connected in parallel, the other end of the resistor R1 away from the RESET pin is connected with the VBAT pin, the other end of the capacitor C5 away from the RESET pin is connected with the ground signal GND, the RXD pin, the TXD pin, and the RING pin of the main control chip U2 are connected with the TXD pin, the RXD pin, and the RI pin of the main control chip U1 of the corresponding MCU through a resistor R6, a resistor R7, and a resistor R8, the RF-ANT pin of the main control chip U2 is connected with a pi-type matching circuit, the pi-type matching circuit includes a capacitor C11, a capacitor C12, a capacitor C5, and a resistor R5 and an end of the ANT pin, the other end of the capacitor C11 and the other end of the capacitor C12 are both connected with a ground signal GND;

the USIM _ DATA pin of the main control chip U2 is connected with the USIM _ VDD pin through a pull-up resistor R9, the USIM _ VDD pin of the main control chip U2 is connected with the USIM _ GND pin through a capacitor C9, the USIM _ DATA pin, the USIM _ CLK pin and the USIM RST pin of the main control chip U2 are connected with the IO pin, the CLK pin and the RST pin of the corresponding SIM card through a resistor R2, a resistor R3 and a resistor R4 respectively, the USIM _ VDD pin of the main control chip U2 is connected with the VCC pin of the SIM card, the USIM _ GND pin of the main control chip U2 is connected with the GND pin of the SIM card, the IO pin, the CLK pin and the RST pin of the SIM card are connected with a ground signal through a capacitor C6, a capacitor C7 and a capacitor C8 respectively, and the IO pin, the CLK pin, the VCC pin and the RS.

Furthermore, the communication power supply control module comprises a power supply control switch circuit and a communication power supply voltage stabilizing circuit, the power supply control switch circuit comprises a resistor R10, a resistor R11, a resistor R12, a triode T16 and a CMOS switch tube Q7, and the model of a voltage stabilizing chip U9 of the communication power supply voltage stabilizing circuit is TD 1410;

the source electrode of the CMOS switch tube Q7 is connected with a power supply input VCIN, the grid electrode of the CMOS switch tube Q7 is connected with the collector electrode of a triode T16 through a resistor R12, the drain electrode of the CMOS switch tube is connected with a VIN pin of a voltage stabilizing chip U9, the power supply input VCIN is connected with the collector electrode of a triode T16 through a resistor R10, the base electrode of a triode T16 is connected with an IO pin of a main control chip U1 of the MCU through a resistor R12, and the emitter electrode of the triode T85;

the VIN pin and the GND pin of the voltage stabilizing chip U9 are connected with a capacitor C13 and a capacitor C14 in parallel, the VIN pin and the EN pin of the voltage stabilizing chip U9 are connected with a resistor R13 in parallel, the FB pin and the GND pin of the voltage stabilizing chip U9 are connected with a resistor R14 in parallel, the GND pin of the voltage stabilizing chip U9 is connected with a ground signal GND, the SW pin and the GND pin of the voltage stabilizing chip U9 are connected with a diode D3 in parallel, the FB pin of the voltage stabilizing chip U9 is connected with a ground signal GND through a resistor R15 and a capacitor C15 which are connected in series, the connecting end of the resistor R15 and the capacitor C15 is connected with the pin SW of the voltage stabilizing chip U9, the two ends of the capacitor C15 are connected with the capacitor C16, the capacitor C17 and the capacitor C18 in parallel, the connecting end of the resistor R15 and the capacitor C15 is connected.

Furthermore, the model of the main control chip U3 of the clock module is DS1302, a VCC2 pin of the main control chip U3 is connected to an output VCC of the power module, a X1 pin of the main control chip U3 is connected to a ground signal GND through a capacitor C19, an X2 pin of the main control chip U3 is connected to the ground signal GND through a capacitor C2, an X1 pin and an X2 pin of the main control chip U3 are connected to the crystal oscillator Y1 in parallel, a VCC1 pin of the main control chip U3 is connected to a positive electrode of the standby clock battery BT1, a negative electrode of the standby clock battery BT1 is connected to the ground signal GND, an SCLK pin, an I/O pin of the main control chip U3 and a pin are correspondingly connected to a PE0 pin, a PE1 pin and a PE2 pin of the main control chip RST U1 of the MCU, and the main control chip U2, and the SCLK pin, I/O pin and RST pin of the main control chip U2 are connected to the.

Furthermore, the model of the driving chip U4 of the valve control module is MX214B, the GND1 pin and the GND2 pin of the driving chip U4 are both connected to a ground signal GND, the VCC1 pin and the VCC2 pin of the driving chip U4 are both connected to the output terminal VCC of the power supply module, the output terminal VCC of the power supply module is connected to a ground signal GND through a capacitor C19, the IA pin and the IB pin of the driving chip U4 are respectively and correspondingly connected to the PG7 pin and the PG6 pin of the main control chip U1 of the MCU, the OA pin and the OB pin of the driving chip U4 are both connected to a valve driver interface J _ FM, the PG4 pin and the PG5 pin of the main control chip of the MCU are both connected to a valve driver interface J _ FM, and the valve driver interface J _ FM is connected to the.

Furthermore, a rubber gasket is arranged on a contact part of the connecting pipe nut and the signaling gas meter.

The beneficial effect of this scheme does:

(1) the NB-IoT gas meter is adopted, real-time data communication is carried out by utilizing an operator network, the problem that the traditional IC card gas meter cannot be remotely read is solved, and the practicability of the equipment is improved;

(2) engineering wiring is not needed, and a special network of an operator is utilized, so that the problem that the traditional wired remote transmitting meter is difficult to construct is solved, and the cost investment is saved;

(3) the operator NB-IoT special network has wide coverage and good signals, does not need to establish a network by itself, and solves the problem of signal coverage; the NB-IoT technology has the characteristic of low power consumption, and the power control module is provided for realizing power management, so that the power consumption can be well reduced, and the problem of high power consumption is solved.

Drawings

FIG. 1 is a schematic diagram of an NB-IoT gas meter;

FIG. 2 is a block diagram of an NB-IoT IOT gas meter controller architecture;

FIG. 3 is a schematic circuit diagram of an NB-IoT communication module;

FIG. 4 is a schematic circuit diagram of a communication power control module;

FIG. 5 is a schematic diagram of a clock module circuit;

fig. 6 is a schematic circuit diagram of a valve control module.

Wherein, 1, sending a message gas meter; 2. a valve; 3. a valve driver; 4. a controller; 5. a counter; 6. a signal cable; 7. connecting an interface; 8. and (5) connecting the pipe nut.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplified description, and it is not intended to indicate or imply that the referred unit or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art can understand the specific meaning of the above terms according to specific situations.

As shown in fig. 1, an NB-IoT internet of things gas meter includes a signaling gas meter 1, a valve 2, a valve driver 3, a controller 4 and a counter 5, where the valve driver 3 is located inside the controller 4 and is respectively in communication connection with the controller 4 and the valve 2, both sides of the top end of the signaling gas meter 1 are provided with a gas inlet and a gas outlet, both the outside of a connection interface 7 of the gas inlet and the outside of a connection interface 7 of the gas outlet are provided with first threads, the connection interface 7 of the gas outlet is fixedly connected with a gas pipeline through a connection pipe nut 8, the valve 2 is fixedly connected with the connection interface 7 of the gas inlet through the connection pipe nut 8, the inside of the connection pipe nut 8 is provided with second threads matched with the first threads, and the counter 5 is located inside the signaling gas meter 1 and is in communication connection with the controller 4 through a signal; a rubber gasket is arranged at the contact part of the adapter nut 8 and the signaling gas meter 1 for sealing protection to prevent gas leakage;

as shown in fig. 2, the controller 4 includes an MCU, a sampling module, a valve control module, a power module, a clock module, a communication power control module, a communication module, an SIM card and a radio frequency antenna, the MCU is respectively in communication connection with the sampling module, the valve control module, the clock module, the communication power control module and the communication module, the power module is respectively in electrical connection with the MCU, the valve control module, the clock module and the communication power control module, the MCU controls the valve driver 3 through the valve control module to control the valve 2 of the NB-IoT internet of things gas meter to perform the opening and closing operation, the communication module is respectively in communication connection with the communication power control module, the SIM card and the radio frequency antenna, the communication power control module and the SIM card are used for realizing the communication of the NB-IoT internet of things gas meter, the data communication and the information interaction with the system are realized, the sampling module is in communication connection with the counter 5, and the MCU collects the using amount information of the counter 5 of the transmitting gas meter 1 through the sampling module, so that the conversion between the mechanical character wheel and the electronic reading of the NB-IoT gas meter is realized.

In this embodiment, the inside of counter 5 is provided with mechanical transmission, mechanical character wheel and signaling sensor, signaling sensor is magnetic sensor, mechanical transmission and mechanical character wheel swing joint, and its contact part with mechanical character wheel is provided with the electro-magnet, along with the character wheel rotates, signaling sensor will switch between switching on and breaking, signaling sensor's both ends respectively with electro-magnet and 4 communication connection of controller, pulse signal and then the quantity information of gathering the gas table through gathering signaling sensor.

In this embodiment, the communication module is an NB-IoT communication module.

In this embodiment, as shown in fig. 3, a main control chip U2 of the NB-IoT communication module is M5310, M5310 is an industrial-level multiband NB-IoT wireless module, and its operating frequency bands are Band3, Band 5, and Band 8, which are mainly applied to low-power-consumption data transmission services and meet the 3gpp Release14 standard, M5310 is a chip M5310 module packaged by LCC, and has 30 pins with a size of only 19mm × 18.4mm × 2.2mm, and data transmission protocols such as LwM2M/MQTT-SN/TCP/UDP/COAP and extended AT commands are embedded, and it adopts a low-power-consumption technology to reduce the current power consumption to 3uA in the PSM mode; the voltage input range of the VBAT pin is 3.1V-4.2V, in order to ensure that the VBAT voltage does not drop below 3.1V, a capacitor bank is connected between the VBAT pin of a main control chip U2 and a GND pin of the VBAT pin close to the VBAT input end of the module, the capacitor bank comprises a 100uF tantalum capacitor C1, a 100nF filter capacitor C2, a 100pF filter capacitor C3 and a 22pF filter capacitor C4 which are connected in parallel with low ESR (equivalent series resistance to 0.7 omega), the RESET of the module is realized by pulling down the RESET pin for a certain time, the duration of the low level for realizing the RESET is longer than 100ms, the RESET RESET pin of the main control chip U2 is connected with a resistor R1 and a capacitor C5 which are connected in parallel, the power-on RESET function of the module is realized, the other end of the resistor R1 far away from the RESET pin is connected with the VBAT pin, the other end of the capacitor C5 far away from the RESET pin is connected with a ground signal, in order to match the communication level, and as, the MCU is connected with a connecting line between communication serial ports of the M5310 in series through a resistor for level matching, an RXD pin, a TXD pin and a RING pin of the main control chip U2 are connected with a TXD pin, an RXD pin and an RI pin of a main control chip U1 of the corresponding MCU through a resistor R6, a resistor R7 and a resistor R8 respectively, serial data interaction between the MCU and the M5310 is achieved, an RF-ANT pin of the main control chip U2 is connected with a pi-type matching circuit, radio frequency performance is adjusted better, the pi-type matching circuit comprises a capacitor C11, a capacitor C12 and a resistor R5 and is placed close to the radio frequency antenna as much as possible, one end of the resistor R5 is connected with the RF-ANT pin and one end of the capacitor C11 respectively, the other end of the resistor R5 is connected with the radio frequency antenna and one end of the capacitor C12 respectively, and the other end of the capacitor C;

the USIM _ DATA pin of the main control chip U2 is connected with the USIM _ VDD pin through a 10K pull-up resistor R9 to enhance the SIM card stability, the USIM _ VDD pin of the main control chip U2 is connected with the USIM _ GND pin through a capacitor C9, the USIM _ DATA pin, USIM _ CLK pin and USIM _ RST pin of the main control chip U2 are respectively connected with the IO pin, CLK pin and RST pin of the corresponding SIM card through a resistor R2, a resistor R3 and a resistor R4 which are all 22 Ω to suppress stray transmission of EMI and enhance ESD protection, the USIM _ VDD pin of the main control chip U2 is connected with the VCC pin of the SIM card, the _ GND pin of the main control chip U2 is connected with the GND pin of the SIM card, the IO pin, CLK pin and pin of the SIM card are respectively connected with the ground signal GND through a capacitor C6, a capacitor C7 and a capacitor C85RST pin which are all 33pF to place the bypass capacitor C8 near the signal line, the peripheral circuit of the SIM card is close to the SIM card, the EMI suppression effect is improved, the IO pin, the CLK pin, the VCC pin and the RST pin of the SIM card are all connected with the TVS diode array TVS1, the TVS diode array TVS1 is used for providing good ESD protection, the TVS diode array TVS1 is placed close to the SIM card connector, and the protected SIM card interface signal line is ensured to firstly pass through the TVS diode array TVS1 protection device and then lead to the M5310.

In this embodiment, as shown in fig. 4, the communication power control module includes a power control switch circuit and a communication power voltage stabilizing circuit, the power control switch circuit includes a resistor R10, a resistor R11, a resistor R12, a transistor T16, and a CMOS switch tube Q7, and a voltage stabilizing chip U9 of the communication power voltage stabilizing circuit is TD 1410;

the source of the CMOS switch tube Q7 is connected with a power supply input VCIN, the grid of the CMOS switch tube is connected with the collector of a triode T16 through a resistor R12, the drain of the CMOS switch tube is connected with a VIN pin of a voltage stabilizing chip U9, the power supply input VCIN is connected with the collector of a triode T16 through a resistor R10, the base of a triode T16 is connected with an IO pin (namely VDD _ NB _ CTRL) of a main control chip U1 of the MCU through a resistor R12 to control the switching of the NB-IoT power supply, when the low level is output, the power supply is switched off, when the high level is output, the power supply is switched on, and the emitter;

the VIN pin and the GND pin of the voltage stabilizing chip U9 are connected with a stabilizing capacitor C13 and a filter capacitor C14 in parallel, the VIN pin and the EN pin of the voltage stabilizing chip U9 are connected with a resistor R13 in parallel, the FB pin and the GND pin of the voltage stabilizing chip U9 are connected with a resistor R14 in parallel, the GND pin of the voltage stabilizing chip U9 is connected with a ground signal GND, the SW pin and the GND pin of the voltage stabilizing chip U9 are connected with a diode D3 in parallel, the FB pin of the voltage stabilizing chip U9 is connected with a ground signal GND through a resistor R15 and a capacitor C15 which are connected in series, the connecting end of the resistor R15 and the capacitor C15 is connected with the SW pin of the voltage stabilizing chip U9, the two ends of the energy storage capacitor C15 are connected with a capacitor filter C16, a filter capacitor C17 and a filter capacitor C18 in parallel, and the connecting end of the resistor R15 and the capacitor C63.

In this embodiment, as shown in fig. 5, a main control chip U3 of the clock module is of a model DS1302, which provides clock information for NB-IoT internet of things gas meter communication, a VCC2 pin of the main control chip U3 is connected to an output terminal VCC of the power module, which is a main power supply, an X1 pin of the main control chip U3 is connected to a ground signal GND through a capacitor C19, an X2 pin of the main control chip U3 is connected to the ground signal GND through a capacitor C2, an X1 pin and an X2 pin of the main control chip U3 are oscillation source pins, a 32.768kHz crystal oscillator Y1 is connected in parallel, a VCC1 pin of the main control chip U3 is connected to a positive electrode of a backup clock battery BT1, which is a backup power supply, and can keep continuous operation of the clock under the condition that the main power supply is turned off, a negative electrode of the backup clock battery BT1 is connected to the ground signal GND, a k pin, an I/O pin and a BT pin of the main control chip U3 are correspondingly connected to a PE, the SCLK pin, the I/O pin and the RST pin of the main control chip U3 are connected with the output terminal VCC of the power module through a resistor R18, a resistor R16 and a resistor R17 respectively; DS1302 is powered by the larger of VCC1 or VCC2, VCC2 supplies power to DS1302 when VCC2 is larger than VCC1+0.2V, and DS1302 is powered by VCC1 when VCC2 is smaller than VCC1, so BT1 in the circuit is enough to be used as a spare by a 3V button battery.

In this embodiment, as shown in fig. 6, a model of a driving chip U4 of the valve control module is MX214B, a GND1 pin and a GND2 pin of the driving chip U4 are both connected to a ground signal GND, a VCC1 pin and a VCC2 pin of the driving chip U4 are both connected to an output terminal VCC of the power supply module, the output terminal VCC of the power supply module is connected to the ground signal GND through a capacitor C19, an IA pin and an IB pin of the driving chip U4 are respectively and correspondingly connected to a PG7 pin and a PG6 pin of a main control chip U1 of the MCU, the MCU controls a level of an output pin of the valve driving chip U4 through levels of a PG6 pin and a PG7 pin, so as to control opening, closing, and stopping of the valve, an OA pin and an OB pin of the driving chip U4 are both connected to a valve driver interface J _ FM for driving a motor of the valve driver, a PG4 pin of the MCU is an input pin of the valve-off-in-position signal, a PG 8 pin of the, the PG4 pin and the PG5 pin of the main control chip of the MCU are both connected with a valve driver interface J _ FM, and the valve driver interface J _ FM is connected with a ground signal GND.

The utility model provides a pair of the practicality is high, the cost drops into low, the signal covers good and the low-power consumption NB-IoT thing networking gas table, has solved the problem that can not long-rangely check meter, the practicality is low, the construction is difficult, the cost drops into high, the signal covers not well and the high-power consumption that prior art exists.

The above is only the embodiment of the present invention, and the embodiment is used for understanding the structure, function and effect of the present invention, and is not used for limiting the protection scope of the present invention. The utility model can be changed and changed in various ways, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included within the protection scope of the utility model.

Claims

1. An NB-IoT gas meter is characterized by comprising a signaling gas meter (1), a valve (2), a valve driver (3), a controller (4) and a counter (5), wherein the valve driver (3) is positioned inside the controller (4) and is respectively in communication connection with the controller (4) and the valve (2), a gas inlet and a gas outlet are arranged on two sides of the top end of the signaling gas meter (1), first threads are arranged on the outer side of a connecting interface (7) of the gas inlet and the outer side of a connecting interface (7) of the gas outlet, the connecting interface (7) of the gas outlet is fixedly connected with a gas pipeline through a connecting pipe nut (8), the valve (2) is fixedly connected with the connecting interface (7) of the gas inlet through the connecting pipe nut (8), and a second thread matched with the first thread is arranged inside the connecting pipe nut (8), the counter (5) is positioned inside the signaling gas meter (1) and is in communication connection with the controller (4) through a signal cable (6);

controller (4) include MCU, sampling module, valve control module, power module, clock module, communication power supply control module, communication module, SIM card and radio frequency antenna, MCU respectively with sampling module, valve control module, clock module, communication power supply control module and communication module communication connection, power module respectively with MCU, valve control module, clock module and communication power supply control module electric connection, communication module respectively with communication power supply control module, SIM card and radio frequency antenna communication connection, valve control module and valve driver (3) communication connection, sampling module and counter (5) communication connection.

2. The NB-IoT (Internet of things) gas meter according to claim 1, wherein a mechanical transmission device, a mechanical character wheel and a signaling sensor are arranged inside the counter (5), the mechanical transmission device is movably connected with the mechanical character wheel, an electromagnet is arranged on a contact part of the mechanical transmission device and the mechanical character wheel, and two ends of the signaling sensor are respectively in communication connection with the electromagnet and the controller (4).

3. The NB-IoT Internet of things gas meter according to claim 1, wherein the communication module is an NB-IoT communication module.

4. The NB-IoT Internet of things gas meter according to claim 1, wherein the NB-IoT communication module has a master control chip U2 of model M5310, and a capacitor bank is connected between a VBAT pin and a GND pin of the master control chip U2, the capacitor bank includes a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4 connected in parallel, the RESET pin of the master control chip U2 is connected with a resistor R1 and a capacitor C5 connected in parallel, the other end of the resistor R1 away from the RESET pin is connected with the VBAT pin, the other end of the capacitor C5 away from the RESET pin is connected with a ground signal GND, the RXD pin, the RXD 8 and the RING pin of the master control chip U1 of the MCU are connected with a TXD pin, an RXD pin and a RING pin of the master control chip U2 through a resistor R6, a resistor R38 and a resistor R8, respectively, and the TXD pin of the MCU is connected with a pi matching circuit, and the pi matching circuit includes a capacitor C2 The antenna comprises a capacitor C12 and a resistor R5, wherein one end of the resistor R5 is respectively connected with an RF-ANT pin and one end of the capacitor C11, the other end of the resistor R5 is respectively connected with a radio frequency antenna and one end of the capacitor C12, and the other end of the capacitor C11 and the other end of the capacitor C12 are both connected with a ground signal GND;

the USIM _ DATA pin of the main control chip U2 is connected with the USIM _ VDD pin through a pull-up resistor R9, the USIM _ VDD pin of the main control chip U2 is connected with the USIM _ GND pin through a capacitor C9, the USIM _ DATA pin, the USIM _ CLK pin and the USIM RST pin of the main control chip U2 are connected with the IO pin, the CLK pin and the RST pin of the corresponding SIM card through a resistor R2, a resistor R3 and a resistor R4 respectively, the USIM _ VDD pin of the main control chip U2 is connected with the VCC pin of the SIM card, the USIM _ GND pin of the main control chip U2 is connected with the GND pin of the SIM card, the IO pin, the CLK pin and the RST pin of the SIM card are connected with a ground signal through a capacitor C6, a capacitor C7 and a capacitor C8 respectively, and the IO pin, the VCC pin and the RST.

5. The NB-IoT Internet of things gas meter according to claim 1, wherein the communication power supply control module comprises a power supply control switch circuit and a communication power supply voltage stabilizing circuit, the power supply control switch circuit comprises a resistor R10, a resistor R11, a resistor R12, a triode T16 and a CMOS switch tube Q7, and a voltage stabilizing chip U9 of the communication power supply voltage stabilizing circuit is TD 1410;

the source electrode of the CMOS switch tube Q7 is connected with a power supply input VCIN, the grid electrode of the CMOS switch tube Q7 is connected with the collector electrode of a triode T16 through a resistor R12, the drain electrode of the CMOS switch tube is connected with a VIN pin of a voltage stabilizing chip U9, the power supply input VCIN is connected with the collector electrode of a triode T16 through a resistor R10, the base electrode of the triode T16 is connected with the IO pin of a main control chip U1 of the MCU through a resistor R12, and the emitter electrode of the triode T16 is connected;

the VIN pin and the GND pin of the voltage stabilizing chip U9 are connected with a capacitor C13 and a capacitor C14 in parallel, the VIN pin and the EN pin of the voltage stabilizing chip U9 are connected with a resistor R13 in parallel, the FB pin and the GND pin of the voltage stabilizing chip U9 are connected with a resistor R14 in parallel, the GND pin of the voltage stabilizing chip U9 is connected with a ground signal GND, the SW pin and the GND pin of the voltage stabilizing chip U9 are connected with a diode D3 in parallel, the FB pin of the voltage stabilizing chip U9 is connected with a ground signal GND through a resistor R15 and a capacitor C15 which are connected in series, the connecting end of the resistor R15 and the capacitor C15 is connected with the SW pin of the voltage stabilizing chip U9, two ends of the capacitor C15 are connected with a capacitor C16, a capacitor C17 and a capacitor C18 in parallel, the connecting end of the resistor R15 and the capacitor C15 is connected with a power supply.

6. The NB-IoT Internet of things gas meter of claim 1, the model of the main control chip U3 of the clock module is DS1302, the VCC2 pin of the main control chip U3 is connected with the output VCC of the power module, the X1 pin of the main control chip U3 is connected with the ground signal GND through the capacitor C19, the X2 pin of the main control chip U3 is connected with the ground signal GND through the capacitor C2, the X1 pin and the X2 pin of the main control chip U3 are connected with the crystal oscillator Y1 in parallel, the VCC1 pin of the main control chip U3 is connected with the positive pole of the clock backup battery BT1, the negative electrode of the clock backup battery BT1 is connected with a ground signal GND, the SCLK pin, the I/O pin and the RST pin of the main control chip U3 are correspondingly connected with the PE0 pin, the PE1 pin and the PE2 pin of the main control chip U1 of the MCU, and the SCLK pin, the I/O pin, and the RST pin of the main control chip U3 are connected to the output VCC of the power module through the resistor R18, the resistor R16, and the resistor R17, respectively.

7. The NB-IoT Internet of things gas meter according to claim 1, wherein a model of a driving chip U4 of the valve control module is MX214B, a GND1 pin and a GND2 pin of the driving chip U4 are both connected to a ground signal GND, a VCC1 pin and a VCC2 pin of the driving chip U4 are both connected to an output VCC of a power supply module, the output VCC of the power supply module is connected to the ground signal GND through a capacitor C19, IA pins and IB pins of the driving chip U4 are respectively and correspondingly connected to a PG7 pin and a PG6 pin of a main control chip U1 of an MCU, an OA pin and an OB pin of the driving chip U4 are both connected to a valve driver interface J _ FM, PG4 pin and PG5 pin of the main control chip of the MCU are both connected to a valve driver interface J _ FM, and the valve driver interface J _ FM is connected to the ground signal GND.

8. The NB-IoT Internet of things gas meter according to claim 1, wherein a rubber gasket is arranged on a contact part of the adapter nut and the signaling gas meter.