CN216899032U

CN216899032U - NB-IoT intelligent gas meter

Info

Publication number: CN216899032U
Application number: CN202220411734.9U
Authority: CN
Inventors: 李文华; 吴华清; 王兵
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-07-05
Anticipated expiration: 2032-02-28

Abstract

The utility model discloses an NB-IoT intelligent gas meter, wherein the NB-IoT intelligent gas meter comprises a gas base meter and a main control board, the gas base meter comprises a shell, a valve and a counter which are arranged in the shell, the main control board is arranged in the shell and at least comprises a control module, a valve module and a communication module which are respectively coupled with the control module, the control module is used for receiving signals of the communication module or gas meter information acquired by the counter so as to control the valve module to control the valve and send the gas meter information acquired by the counter to the communication module, the communication module at least comprises an NB-IoT unit and a communication starting unit which are coupled, the communication starting unit is used for receiving commands of the control module and controlling the NB-IoT unit to be opened or closed, the NB-IoT unit is used for receiving and transmitting signals sent by the control module to external equipment, monitoring and receiving external equipment signals and forwarding the external equipment signals to the control module; the method can realize quasi-real-time communication under the condition of keeping lower power consumption, and accurately and quickly meet the user requirements.

Description

NB-IoT intelligent gas meter

Technical Field

The utility model relates to the field of intelligent instrument equipment, in particular to an NB-IoT intelligent gas meter.

Background

Most of the existing NB-IoT communication modes applied to the intelligent gas meter powered by the alkaline battery are a power-off and power-on mode and a PSM power-saving mode. After the power-off and power-on modes are powered on every time, network attachment needs to be reestablished, the generated instantaneous current is large, the stability and the functionality of a module are influenced, and the service life of a battery is also shortened; the PSM power saving mode is only used for networking and completing data uploading in a fixed time period every day, and is always in an off-network dormant state in other time periods, so that the network side can keep a connection context when the meter sleeps and does not need to frequently establish network attachment. Although the PSM power saving mode greatly reduces the power consumption of the gas meter, if the instruction issued by the system needs to be received and processed, the operation can be completed only within a fixed communication time period, the waiting time for the gas meter to execute the instruction issued by the system is too long, the response is inefficient, generally, the gas meter can only be given a chance once a day, the real-time performance is lacked, and the user requirements cannot be accurately and quickly met in the face of some service scenes.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the technology, the utility model provides the NB-IoT intelligent gas meter, so that the intelligent gas meter can realize quasi real-time communication under the condition of keeping lower power consumption, and can accurately and quickly meet the user requirements.

The technical scheme adopted by the utility model for overcoming the technical problems is as follows: the utility model provides an NB-IoT intelligent gas meter, which comprises a gas base meter and a main control board, wherein the gas base meter comprises a shell, a valve which is arranged in the shell and used for controlling gas circulation and a counter used for metering gas usage, the main control board is arranged in the shell and at least comprises a control module, a valve module and a communication module which are respectively coupled with the control module, and the control module is used for receiving signals of the communication module or gas meter information collected by the counter, controlling the valve module to control the valve and sending the gas meter information collected by the counter to the communication module; the communication module at least comprises an NB-IoT unit and a communication starting unit which are coupled, wherein the communication starting unit is used for receiving a command of the control module and controlling the NB-IoT unit to be turned on or off, and the NB-IoT unit is used for receiving and forwarding a signal sent by the control module to an external device, monitoring and receiving the signal of the external device and forwarding the signal to the control module.

The control module controls the communication starting unit so as to control the communication between the NB-IoT unit and the control module or between the NB-IoT unit and external equipment, and the starting unit is controlled to realize simple configuration of an NB-IoT working mode, such as eDRX, so that the gas meter can respond to user requirements in time.

Further, the control module at least includes a control chip U7, the pin 25 of the control chip U7 is coupled to the NB-IoT unit serial port receiving pin as a first output pin, the pin 26 is coupled to the NB-IoT unit serial port transmitting pin as a first receiving pin, the pins 34 to 36 output control signals and are coupled to the valve module, the pins 31 to 33 are coupled to the valve module input valve state signals, and the pin 45 and the pin 46 are coupled to the data signal and the clock signal of the counter, respectively.

Further, the NB-IoT unit includes at least an NB-IoT chip U1 and a SIM interface, pin 30 of the chip U1 is coupled to pin 26 of the control chip U7, pin 29 is coupled to pin 25 of the control chip U7, and pins 39 to 41 are coupled to

pins

7, 2 and 6 of the SIM interface, respectively.

The control module is in serial port communication with the NB-IoT unit, and the control module controls the on-off of the valve through an external command received by the communication module.

Further, the communication starting unit comprises a resistor R7, a resistor R12 and a transistor Q4, wherein one end of the resistor R7 is coupled to the pin 71 of the control chip U7, the other end of the resistor R7 is coupled to one end of the resistor R12 and the base of the transistor Q4, the collector of the transistor Q4 is coupled to the pin 15 of the NB-IoT chip U1, and the emitter and the other end of the resistor R12 are coupled to ground.

Further, the main control board further includes a power module, the power module at least includes a power conversion unit and an NB-IoT power supply unit coupled to the power conversion unit, the power conversion unit is configured to convert an input power into a power VIN to supply power to the control chip U7, an input end of the NB-IoT power supply unit is coupled to the power VIN, a control end of the NB-IoT power supply unit is coupled to the control chip U7, and an output end of the NB-IoT power supply unit is coupled to a power supply pin of the NB-IoT chip U2.

Further, the NB-IoT power supply unit at least includes transistors Q1 and Q9, a transistor Q16, resistors R1 and R2, R66, and capacitors C2 to C6, wherein a source of the transistor Q9 is coupled to the power source VIN, a gate of the transistor Q1 is coupled to ground, a drain of the transistor Q1 is coupled to one end of the resistor R1 and a drain of the transistor Q1, a gate of the transistor Q1 and one end of the resistor R2 at the other end of the resistor R1 are coupled to the source, and anodes of the capacitors C2 and C3, one ends of the resistors C4 to C6 output the power source VDD, the other end of the resistor R2 is coupled to a collector of the transistor Q16, an emitter of the transistor Q16 is coupled to ground, a base electrode of the resistor R66 is coupled to one end of the resistor R66, the other end of the resistor R66 is coupled to the pin 66 of the control chip U7, and the cathodes of the capacitors C2 and the capacitors C3 and the other ends of the capacitors C4 to C6 are coupled to ground.

Further, the communication module further includes a bluetooth unit, the bluetooth unit at least includes a bluetooth chip U5, the pin 17 of the bluetooth chip U5 is coupled to the pin 22 of the control chip U7 as a second output pin, the pin 18 is coupled to the pin 23 of the control chip U7 as a second receiving pin, the pin 8 is coupled to the pin 28 of the control chip U7, the pin 9 is coupled to the pin 58 of the control chip U7, and the pin 22 is coupled to the pin 72 of the control chip U7.

The communication module realizes long-distance communication through the NB-IoT unit and is used for short-distance communication through the Bluetooth unit.

The utility model has the beneficial effects that:

1. the intelligent gas meter realizes quasi real-time communication under the condition of keeping lower power consumption, and can accurately and quickly meet the user requirements.

2. The gas meter can also feed back to the upper system more quickly when the meter is abnormal or the communication is abnormal.

3. The communication starting unit is arranged, and the starting time of the NB-IoT chip can be flexibly set by the control module, so that the NB-IoT can be conveniently set to operate in an eDRX mode or other power saving modes.

4. The power supply and the starting of the NB-IoT chip are separately controlled, and after the power-on activation is not needed, a large-current event can not be generated, the impact on the module and the battery can not be caused, the service life of the module is prolonged, and the system stability is enhanced.

Drawings

Fig. 1 is a schematic structural diagram of an NB-IoT intelligent gas meter according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the composition and connection relationship of a main control board according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a control module according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of an NB-IoT chip of an NB-IoT unit according to an embodiment of the present invention;

fig. 5 is a schematic diagram of the SIM interface of the NB-IoT unit of an embodiment of the present invention;

FIG. 6 is a schematic diagram of a communication initiation unit of an embodiment of the present invention;

FIG. 7 is a schematic diagram of a power conversion unit according to an embodiment of the utility model;

fig. 8 is a schematic diagram of an NB-IoT power supply unit of an embodiment of the present invention;

FIG. 9 is a schematic diagram of a Bluetooth unit of an embodiment of the present invention;

in the figure, 1-valve; 2, a counter; 3, a main control board; 4-a battery pack; 5-a shell.

Detailed Description

In order to facilitate a better understanding of the utility model for those skilled in the art, the utility model will be described in further detail with reference to the accompanying drawings and specific examples, which are given by way of illustration only and do not limit the scope of the utility model.

As shown in fig. 1, the NB-IoT intelligent gas meter according to this embodiment includes a gas-based meter and a main control board 3, where the gas-based meter includes a housing 5, a valve 1 disposed inside the housing 5 for controlling gas circulation and a counter 2 for measuring gas usage, and the main control board 3 is disposed inside the housing 5.

A schematic diagram of the composition and connection relationship of the main control board 3 is shown in fig. 2, and the main control board at least includes a control module, and a valve module and a communication module which are respectively coupled to the control module, where the control module is configured to receive a signal of the communication module or gas meter information acquired by a counter, so as to control the valve module to control the valve, and send the gas meter information acquired by the counter to the communication module; the communication module at least comprises an NB-IoT unit and a communication starting unit which are coupled, wherein the communication starting unit is used for receiving a command of the control module and controlling the NB-IoT unit to be switched on or switched off, and the NB-IoT unit is used for receiving and forwarding a signal sent by the control module to an external device, monitoring and receiving the signal of the external device and forwarding the signal to the control module.

The data collected by the main control board 3 includes the gas usage flow information of the gas meter, and whether the valve is closed is determined according to the gas usage flow information.

In order to facilitate a better understanding of the utility model for those skilled in the art, the utility model will be described in further detail with reference to the accompanying figures 3-9 and the following detailed description, which are given by way of illustration only and do not limit the scope of the utility model.

Each module of the main control board 3 will be described in detail. As shown in fig. 3, which is a schematic diagram of a control module, the control module at least includes a control chip U7, as shown in fig. 3 and 4, a pin 25 of the control chip U7 is coupled to a pin 29 of the NB-IoT chip as a first output pin, a pin 26 is coupled to a pin 30 of the NB-IoT chip as a first receiving pin, and pins 34 to 36 output SLEEP, OPEN, and CLOSE control signals, respectively, which are coupled to the valve module, so as to control the opening and closing of the valve through a connector of the valve module, thereby controlling the amount of gas passing through the gas meter. Pins 31-33 are coupled to the valve module input valve status signals as M-CHK, STA1, STA1, respectively, to detect the status of the valve.

Pins

45 and 46 are coupled to the data signal and clock signal of the counter, respectively, to obtain the signal of the counter or of the pressure transmitter.

In some embodiments, the control module further outputs a display signal to the display module, so that the information of the gas meter is displayed on the display module.

The control module is also connected with a storage chip and used for storing the gas quantity or state information acquired by the gas meter.

In an embodiment of the present invention, the control chip U7 employs FM33G 048.

As shown in fig. 4 and 5, the NB-IoT unit circuit schematic diagram of the communication module, and fig. 6 is a circuit schematic diagram of the communication initiation unit.

NB-IoT communication is a narrow-band Internet of things, belongs to a low-power wide area network, and has the advantages of low power consumption, low cost, massive connection and the like.

In this embodiment, the NB-IoT unit is configured to establish remote communication between the gas management platform and the gas meter, so that the gas management platform remotely obtains the gas flow and the operating state used by the gas meter through the NB-IoT unit, and stores the gas flow and the operating state in the database. And the gas meter remotely executes commands of the gas management platform through the NB-IoT unit, such as sending operations of switching valves, updating balance and the like.

The NB-IoT unit comprises an NB-IoT chip U1 and a SIM interface, the chip U1 is connected with the control chip U7, and the pins 39-41 are respectively coupled with

pins

7, 2 and 6 of the SIM interface. The SIM interface is inserted into the SIM card, and remote communication is carried out with the gas management platform through the SIM card.

The communication start unit shown in fig. 6 includes a resistor R7, a resistor R12, and a transistor Q4, wherein one end of the resistor R7 is coupled to the pin 71 of the control chip U7, the other end of the resistor R7 is coupled to one end of the resistor R12 and the base of the transistor Q4, the collector of the transistor Q4 is coupled to the pin 15 of the NB-IoT chip U1, and the emitter and the other end of the resistor R12 are coupled to ground.

After the NB-IoT chip U1 is powered on, the BC95 chip can be controlled to work normally or stand by resetting the pin 15 through the controller.

In an embodiment of the utility model, the control module and the NB-IoT chip U1 configure the eDRX mode to communicate with the gas management platform through the sim card.

In an embodiment of the utility model, NB-IoT chip U1 employs BC 95. The triode Q4 adopts NPNS-9013, the resistor R7 is 3k omega, and the resistor R12 is 1k ohm.

On the other hand, the power supply of the NB-IoT chip U1 is controlled by the control module, so that a large-current event can not be generated and the module and the battery can not be impacted after the power-on activation is not needed.

The power module of the main control board at least includes a power conversion unit and an NB-IoT power supply unit coupled to the power conversion unit, and a schematic diagram of the power conversion unit is shown in fig. 7, and is configured to convert an input power into a power VIN to supply power to the control chip U7. As shown in fig. 8, an input terminal of the NB-IoT power supply unit is coupled to a power source VIN, a control terminal thereof is coupled to the control chip U7, and an output terminal thereof is coupled to a power supply pin of the NB-IoT chip U1.

The power conversion unit comprises a power chip U3, wherein a pin 1 of the power chip U3 is coupled to the ground, a pin 2 and one end of a capacitor C41, and the anode of a capacitor C50 are coupled to the cathode of a voltage regulator tube D1, a pin 3 is coupled to a capacitor C52 and the output voltage Vcc of the capacitor C9, the anode of the voltage regulator tube D1 is coupled to the output end of a battery, and the cathodes of the capacitors C9, C52, C41 and C51 are coupled to the ground. The cathode of the capacitor C50 is coupled to the anode of the capacitor C51.

In the embodiment of the utility model, the power chip U3 adopts S-1206B33-U3T1G, the battery generally adopts a 4-section alkaline battery pack, the capacitors C50 and C51 are 1F, the capacitors C41 and C52 are 10uf, and the capacitor C9 is 100 nf.

The NB-IoT power supply unit at least includes transistors Q1 and Q9, a transistor Q16, resistors R1 and R2, R66, capacitors C2 to C6, a source of the transistor Q9 is coupled to the power source VIN, a gate is coupled to ground, a drain is coupled to one end of the resistor R1 and a drain of the transistor Q1, a gate of the transistor Q1 and one end of a resistor R2 at the other end of the resistor R1, a source and anodes of the capacitors C2 and C3, one ends of the resistors C4 to C6 output the power source VDD, the other end of the resistor R2 is coupled to a collector of the transistor Q16, an emitter of the transistor Q16 is coupled to ground, a base electrode is coupled to one end of the resistor R66, the other end of the resistor R66 is coupled to the pin 66 of the control chip U7, cathodes of the capacitors C2 and C3, and the other ends of the capacitors C4 to C6 are coupled to ground.

In the embodiment of the utility model, RZR040P01TL is adopted for Q1 and Q9, NPNS-9013 is adopted for Q16, 100k is adopted for resistor R1, 10k is adopted for R2, 3k is adopted for R66, 1000UF is adopted for capacitor C2, 220UF is adopted for capacitor C2, 100nf is adopted for capacitor C4, 33PF is adopted for C5, and 10PF is adopted for C6.

In addition to the telecommunications module, a close range communications module is also included. In an embodiment of the present invention, the bluetooth unit further includes a bluetooth chip U5, as shown in fig. 8, the pin 17 of the bluetooth chip U5 is coupled to the pin 22 of the control chip U7 as a second output pin, the pin 18 is coupled to the pin 23 of the control chip U7 as a second receiving pin, the pin 8 is coupled to the pin 28 of the control chip U7, the pin 9 is coupled to the pin 58 of the control chip U7, and the pin 22 is coupled to the pin 72 of the control chip U7.

In one implementation of the present invention, the Bluetooth chip U5 uses LSD4BT-E66ASTD001 to communicate with the control module using a serial port.

It should be noted that the near field communication module may also adopt other modes such as NFC.

With the adoption of the scheme, in the aspect of remote communication: the data interaction between the gas meter and the gas management platform is realized in a mode of NB-IoT communication and configuration as eDRX, the remote reading of the running state of the gas meter can be realized, the remote control can also be realized, and in the aspect of near field communication: the method and the device use Bluetooth for near field communication to complete the data interaction of the NB-IoT gas meter and the mobile terminal in a short distance. The power supply and the starting of the NB-IoT chip are separately controlled, and after the power-on activation is not needed, a large-current event can not be generated, the impact on the module and the battery can not be caused, the service life of the module is prolonged, the system stability is enhanced, the user requirements can be efficiently met, and the larger power consumption can not be generated.

The foregoing merely illustrates the principles and preferred embodiments of the utility model and many variations and modifications may be made by those skilled in the art in light of the foregoing description, which are within the scope of the utility model.

Claims

1. An NB-IoT intelligent gas meter comprises a gas base meter and a main control board, wherein the gas base meter comprises a shell, a valve which is arranged in the shell and used for controlling the circulation of gas and a counter used for metering the usage amount of the gas, the main control board is arranged in the shell, the NB-IoT intelligent gas meter is characterized in that the main control board at least comprises a control module, a valve module and a communication module which are respectively coupled with the control module,

the control module is used for receiving signals of the communication module or the gas meter information acquired by the counter, so as to control the valve module to control the valve and send the gas meter information acquired by the counter to the communication module;

the communication module at least comprises an NB-IoT unit and a communication starting unit which are coupled, wherein the communication starting unit is used for receiving a command of the control module and controlling the NB-IoT unit to be turned on or off, and the NB-IoT unit is used for receiving and forwarding a signal sent by the control module to an external device, monitoring and receiving the signal of the external device and forwarding the signal to the control module.

2. The NB-IoT intelligent gas meter according to claim 1, wherein the control module at least comprises a control chip U7, the pin 25 of the control chip U7 is coupled to an NB-IoT unit serial port receiving pin as a first output pin, the pin 26 is coupled to an NB-IoT unit serial port transmitting pin as a first receiving pin, the pins 34 and 36 output control signals and are coupled to the valve module, the pins 31 and 33 are coupled to a valve module input valve status signal, and the pins 45 and 46 are coupled to a data signal and a clock signal of the counter, respectively.

3. The NB-IoT smart gas meter according to claim 2, wherein the NB-IoT unit comprises at least an NB-IoT chip U1 and a SIM interface, pin 30 of the chip U1 is coupled to pin 26 of the control chip U7, pin 29 is coupled to pin 25 of the control chip U7, and pins 39-41 are coupled to pins 7, 2 and 6, respectively, of the SIM interface.

4. The NB-IoT intelligent gas meter according to claim 3, wherein the communication starting unit comprises a resistor R7, a resistor R12 and a transistor Q4, one end of the resistor R7 is coupled to the pin 71 of the control chip U7, the other end of the resistor R7 is coupled to one end of the resistor R12 and the base of the transistor Q4, the collector of the transistor Q4 is coupled to the pin 15 of the NB-IoT chip U1, and the emitter and the other end of the resistor R12 are coupled to ground.

5. The NB-IoT intelligent gas meter according to claim 2,

the main control board further comprises a power supply module, the power supply module at least comprises a power supply conversion unit and an NB-IoT power supply unit coupled with the power supply conversion unit, the power supply conversion unit is used for converting an input power supply into a power supply VIN to supply power to the control chip U7, the input end of the NB-IoT power supply unit is coupled with the power supply VIN, the control end of the NB-IoT power supply unit is coupled with the control chip U7, and the output end of the NB-IoT power supply unit is coupled with a power supply pin of the NB-IoT chip U2.

6. The NB-IoT intelligent gas meter according to claim 5, wherein the NB-IoT power supply unit at least comprises transistors Q1 and Q9, a transistor Q16, resistors R1 and R2, R66, and capacitors C2 and C6, wherein a source of the transistor Q9 is coupled to a power supply VIN, a gate is coupled to ground, a drain is coupled to one end of a resistor R1 and a drain of the transistor Q1, a gate of the transistor Q1 and one end of a resistor R2 at the other end of the resistor R1, a source and anodes of capacitors C2 and C3, one ends of the C4 and C6 output a power supply VDD, the other end of the resistor R2 is coupled to a collector of the transistor Q16, an emitter of the transistor Q16 is coupled to ground, a base electrode is coupled to one end of a resistor R66, the other end of the resistor R66 is coupled to a pin 66 of a control chip U7, and cathodes of the capacitors C2 and C3 and the other ends of the capacitors C4 and C6 are coupled to ground.

7. The NB-IoT intelligent gas meter according to claim 2, wherein the communication module further comprises a bluetooth unit, the bluetooth unit at least comprises a bluetooth chip U5, the pin 17 of the bluetooth chip U5 is coupled to the pin 22 of the control chip U7 as a second output pin, the pin 18 is coupled to the pin 23 of the control chip U7 as a second receiving pin, the pin 8 is coupled to the pin 28 of the control chip U7, the pin 9 is coupled to the pin 58 of the control chip U7, and the pin 22 is coupled to the pin 72 of the control chip U7.