Intelligent gas meter

Abstract

The utility model relates to the technical field of gas meters, in particular to an intelligent gas meter which comprises a gas meter base meter provided with a shell, and a machine core is arranged in the shell. One end of the magnetic transmission assembly is connected with a transmission shaft of the movement, and the other end of the magnetic transmission assembly is connected with an irregular metal sheet; the non-magnetic metering module is arranged on the shell and is opposite to the irregular metal sheet; the non-magnetic metering module is electrically connected with the controller; and the display is electrically connected with the controller. According to the invention, the transmission shaft of the movement can drive the irregular metal sheet to rotate through the magnetic transmission assembly, and the non-magnetic metering module is arranged opposite to the irregular metal sheet, so that a pulse signal related to the number of rotation turns of the irregular metal sheet can be obtained. And then the ventilation capacity in the gas meter base meter can be calculated and obtained through the controller according to the pulse signal.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meters, in particular to an intelligent gas meter. Background Art

[0002] Smart gas meters are intelligent metering devices that are equipped with intelligent control modules (such as sensors, communication modules, microprocessors, etc.) based on traditional diaphragm gas meters, and have functions such as data transmission, remote control, and prepayment management. The main types include: IC card meters, wired / wireless remote transmission meters, Internet of Things meters (NB-IoT meters), etc.

[0003] Existing smart gas meters generally drive the transmission assembly through diaphragm expansion, and set a metering module based on the magnetic principle on the transmission assembly. However, this method is easily affected by magnetic interference, resulting in inaccurate counting. Utility Model Content

[0004] In view of this, the utility model provides a smart gas meter to solve the problem that the existing smart gas meters are easily affected by magnetic interference.

[0005] The utility model provides an intelligent gas meter, comprising:

[0006] The gas meter base meter is provided with a housing, and the movement is arranged in the housing;

[0007] A magnetic transmission assembly, one end of which is connected to the transmission shaft of the movement, and the other end of which is connected to an irregular metal sheet;

[0008] A non-magnetic metering module is arranged on the housing and opposite to the irregular metal sheet;

[0009] A controller, wherein the non-magnetic metering module is electrically connected to the controller;

[0010] A display is electrically connected to the controller.

[0011] In the present application, the transmission shaft of the movement can drive the irregular metal sheet to rotate through the magnetic transmission component, and the non-magnetic metering module is arranged relative to the irregular metal sheet, and a pulse signal related to the number of rotations of the irregular metal sheet can be obtained, and then the controller can calculate the ventilation volume in the base meter of the gas meter according to the pulse signal. The present application calculates the ventilation volume in the base meter of the gas meter through the non-magnetic metering module, which can avoid magnetic interference and ensure the accuracy of ventilation volume counting.

[0012] In an optional embodiment, the magnetic transmission assembly includes:

[0013] An internal magnetic ring, located inside the housing, and connected to a transmission shaft of the movement;

[0014] An output magnetic ring is located on a side of the housing away from the internal magnetic ring;

[0015] The irregular metal sheet is arranged on a side of the output magnetic ring away from the inner magnetic ring, and the inner magnetic ring and the output magnetic ring form a magnetic transmission.

[0016] In the present application, the internal magnetic ring is driven to rotate by the transmission shaft of the movement, and the output magnetic ring and the irregular metal sheet are rotated accordingly under the action of magnetic transmission. The rotation of the irregular metal sheet can reflect the ventilation condition in the base meter of the gas meter.

[0017] In an optional embodiment, the magnetic transmission assembly further includes:

[0018] A bushing is provided through the housing and abuts between the inner magnetic ring and the output magnetic ring.

[0019] In the present application, the bushing can support the output magnetic ring, prevent the output magnetic ring from directly abutting against the shell, and prevent the friction between the output magnetic ring and the shell from causing the output magnetic ring to be unable to rotate with the internal magnetic ring, resulting in inaccurate ventilation volume counting.

[0020] In an optional embodiment, the irregular metal sheet is a semicircular metal sheet, which can make the pulse signal obtained by the controller more regular and facilitate the calculation of the number of rotations of the irregular metal sheet.

[0021] In an optional implementation, the non-magnetic metering module includes:

[0022] A non-magnetic metering circuit board is provided with a non-magnetic metering circuit, and the non-magnetic metering circuit is electrically connected to the controller;

[0023] The non-magnetic metering coil is electrically connected to the non-magnetic metering circuit board, and the non-magnetic metering coil is arranged opposite to the irregular metal sheet.

[0024] In the present application, the non-magnetic metering circuit board can emit ultrasonic electromagnetic waves of a specific frequency through a non-magnetic metering coil. The electromagnetic waves will undergo physical property changes after encountering irregular metal sheets. The movement of the irregular metal sheets will cause the frequency, amplitude and phase of the electromagnetic waves to change. For example, when rotating, the irregular metal sheets periodically cut the electromagnetic field to generate a modulated signal. The non-magnetic metering circuit can convert the modulated signal into a steady-amplitude square wave, which is received and resolved by the controller, and finally outputs an accurate flow rate or number of rotations. The overall ventilation volume is then calculated based on the ventilation volume represented by one rotation of the irregular metal sheet.

[0025] In an optional implementation, it also includes:

[0026] A display is arranged on the housing and connected to the controller. The display is arranged opposite to the irregular metal sheet.

[0027] In an optional embodiment, the central axis of the non-magnetic metering coil coincides with the central axis of the irregular metal sheet, which can make the pulse signal more regular, facilitate the calculation of the number of rotations of the irregular metal sheet, and improve the accuracy of ventilation calculation.

[0028] In an optional implementation, the controller includes:

[0029] The main control chip is electrically connected to the non-magnetic metering circuit and the display respectively.

[0030] In an optional implementation, the controller further includes:

[0031] An NFC communication module, the NFC communication module is electrically connected to the main control chip, and the gas meter base is provided with an NFC card reading area arranged opposite to the NFC communication module;

[0032] The NFC communication module is connected with an NFC antenna to detect when a user places the IC card close to the NFC card reading area, so that the NFC communication module can read the information in the IC card.

[0033] The NFC communication module can establish a signal connection with the overall control system of the gas meter via the NFC antenna, thereby facilitating data transmission between the user's smart gas meter and the overall control system of the gas meter.

[0034] In an optional embodiment, the controller further includes:

[0035] The contactless IC card reader / writer module is used to read the gas quantity information in the IC card and control the opening and closing of the gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0038] Figure 2 This is a schematic diagram of the position of the irregular metal sheet in the embodiment of the utility model;

[0039] Figure 3 This is a schematic diagram of the structure of the magnetic transmission assembly of an embodiment of the utility model;

[0040] Figure 4 This is a schematic diagram of the location of the NFC card reading area in an embodiment of the utility model;

[0041] Figure 5 This is a schematic diagram of the relative positions of the irregular metal sheet and the non-magnetic metering coil in an embodiment of the utility model;

[0042] Figure 6 This is a schematic diagram of a non-magnetic metering circuit board according to an embodiment of the utility model;

[0043] Figure 7 This is a schematic diagram of the structure of the embodiment of the utility model, in which the gas meter and the AFD are connected via a 485 line;

[0044] Figure 8 This is a schematic diagram of the gas meter and AFD connected via infrared rays in an embodiment of the utility model;

[0045] Fig. 9 This is a schematic diagram of the structure of the magnetic transmission assembly of an embodiment of the utility model;

[0046] Fig.10 This is a schematic diagram of a controller circuit board according to an embodiment of the utility model.

[0047] Description of reference numerals:

[0048] 1. Gas meter base; 2. Shell; 3. Irregular metal sheet; 4. Internal magnetic ring; 5. Output magnetic ring; 6. Display; 7. Bushing; 8. Non-magnetic metering circuit board; 9. Non-magnetic metering coil; 10. NFC card reading area; 11. NFC antenna; 12. Upper cover; 13. Lower cover; 14. Lithium battery. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0050] The existing non-magnetic metering scheme of smart gas meters is to add a transmission gear to the mechanical wheel counter of the diaphragm gas meter, install a semicircular metal sheet on the transmission gear, and then place a non-magnetic metering module directly opposite the semicircular metal sheet for metering and sampling. The addition of multiple parts may cause new faults or errors. In addition, there are certain probability defects in the mechanical wheel counter, such as jamming, easy wear of gears, inaccurate counting, high cost, etc., and there will also be a situation where the mechanical wheel count is inconsistent with the LCD cumulative value, causing gas disputes and contradictions.

[0051] Combine the following Figures 1 to 10 , describing an embodiment of the utility model.

[0052] According to an embodiment of the utility model, a smart gas meter is provided, comprising:

[0053] The gas meter base 1 is provided with a housing 2, and the movement is arranged in the housing 2. The gas meter base 1 is provided with an air inlet (meter interface), an air outlet and a pressure port. In addition, the gas meter base 1 is powered by a lithium battery 14, and includes peripheral circuits such as liquid crystal, backlight, buttons, buzzer, NFC card reading and writing, valve, non-magnetic metering, voltage alarm, 485 communication, near infrared communication, cover opening alarm, EEPROM storage, etc. Among them, the valve controls the on and off of the gas pipeline in the gas meter base 1. The gas meter base 1 has a detachable upper cover 12 and a lower cover 13, and the magnetic transmission component, the non-magnetic metering module, the controller and the display 6 can be arranged on the inner side of the upper cover 12.

[0054] The magnetic transmission component has one end connected to the transmission shaft of the movement and the other end connected to an irregular metal sheet 3. The irregularity of the irregular metal sheet 3 can cause the electromagnetic waves reflected on the surface of the irregular metal sheet 3 to change periodically when the irregular metal sheet 3 rotates. Specifically, the magnetic transmission component can be two permanent magnets, one of which is connected to the transmission shaft of the movement, and the other permanent magnet can be arranged between the gas meter base 1 and the shell 2. A blind hole can be arranged on the outside of the shell 2, and a bearing is arranged in the blind hole. The inner side of the bearing is interference-fitted with the permanent magnet, and the outer side of the bearing is interference-fitted with the inner wall of the blind hole, so that a magnetic transmission is formed between the two permanent magnets and the rotation of the permanent magnet between the gas meter base and the shell 2 is not affected. It should be noted that the present embodiment is not limited to this. The permanent magnet used to form the magnetic transmission can be arranged in a ring shape and each permanent magnet is composed of small magnets with opposite polarities arranged at intervals.

[0055] A non-magnetic metering module is arranged on the housing 2 and opposite to the irregular metal sheet 3, and can collect the signal of the rotation of the irregular metal sheet 3. Specifically, a WF6132 non-magnetic metering module can be used;

[0056] It should be noted that the non-magnetic metering circuit in the non-magnetic metering module includes a non-magnetic metering sensor, which can emit ultrasonic electromagnetic waves of a specific frequency to the irregular metal sheet 3. The rotation of the irregular metal sheet 3 can cause a change in the electromagnetic field, and then the number of rotations of the irregular metal sheet 3 can be determined. The irregular metal sheet 3 can have a notch located at the edge, or an opening not located at the center, or a fan-shaped structure, or a semicircular structure, so that the rotation of the irregular metal sheet 3 can cause a change in the emitted electromagnetic wave, and the rotation of the irregular metal sheet 3 can be obtained by the change in the emitted electromagnetic wave. Then the ventilation volume is obtained.

[0057] A controller may be arranged on the housing 2, and the non-magnetic metering module is electrically connected to the controller;

[0058] The display 6, specifically, a liquid crystal display 6, is electrically connected to the controller.

[0059] In the present application, the transmission shaft of the movement can drive the irregular metal sheet to rotate through the magnetic transmission component, and the non-magnetic metering module is arranged relative to the irregular metal sheet 3, and a pulse signal related to the number of rotations of the irregular metal sheet 3 can be obtained, and then the controller can calculate the ventilation volume in the base meter of the gas meter according to the pulse signal. The present application calculates the ventilation volume in the base meter of the gas meter through the non-magnetic metering module, which can avoid magnetic interference and ensure the accuracy of ventilation volume counting.

[0060] In an optional embodiment, the magnetic transmission assembly includes:

[0061] An internal magnetic ring 4 is located inside the housing 2 and is connected to a transmission shaft of the movement;

[0062] An output magnetic ring 5 is located on a side of the housing 2 away from the internal magnetic ring 4;

[0063] Among them, the internal magnetic ring 4 can be composed of an internal plastic sleeve and an internal magnet. The internal magnet can be an annular permanent magnet and is arranged in the internal plastic sleeve. An axial groove is arranged on the side of the internal magnet, and a protrusion matched with the groove is arranged on the inner side of the internal plastic sleeve to prevent relative rotation between the internal plastic sleeve and the internal magnet. The transmission shaft connection of the movement can be connected to the internal plastic sleeve, and the rotation of the internal plastic sleeve can drive the rotation of the internal plastic sleeve and the internal magnet.

[0064] The output magnetic ring 5 can be composed of an output plastic sleeve and an output magnet. The output magnet can be an annular permanent magnet and is arranged in the output plastic sleeve. An axial groove is arranged on the side of the output magnet, and a protrusion adapted to the groove is arranged on the inner side of the output plastic sleeve to prevent relative rotation between the output plastic sleeve and the output magnet, and magnetic transmission is formed between the internal magnet and the output magnet.

[0065] The irregular metal sheet 3 is arranged on a side of the output magnetic ring 5 away from the internal magnetic ring 4 , and the internal magnetic ring 4 and the output magnetic ring 5 form a magnetic transmission.

[0066] In the present application, the internal magnetic ring 4 is driven to rotate by the transmission shaft of the movement, and the output magnetic ring 5 and the irregular metal sheet 3 are rotated accordingly under the action of magnetic transmission. The rotation of the irregular metal sheet 3 can reflect the ventilation situation in the base meter 1 of the gas meter.

[0067] In an optional embodiment, the magnetic transmission assembly further includes:

[0068] The bushing 7 is provided through the housing 2, and the bushing 7 abuts between the internal magnetic ring 4 and the output magnetic ring 5. The bushing 7 can be located between the internal magnet and the output magnet, and abuts against the internal plastic sleeve and the output plastic sleeve, respectively, so that the mutual magnetic force between the internal magnet and the output magnet will not make the output magnet close to the housing 2, resulting in a relatively large friction between the output magnet and the housing 2, affecting the rotation of the output magnet.

[0069] In the present application, the bushing 7 can support the output magnetic ring 5, prevent the output magnetic ring 5 from directly abutting against the shell 2, and prevent the friction between the output magnetic ring 5 and the shell 2 from causing the output magnetic ring 5 to be unable to rotate with the internal magnetic ring 4, causing inaccurate ventilation volume counting.

[0070] In an optional embodiment, the irregular metal sheet 3 is a semicircular metal sheet, which can make the pulse signal obtained by the controller more regular and facilitate the calculation of the number of rotations of the irregular metal sheet 3.

[0071] In an optional implementation, the non-magnetic metering module includes:

[0072] A non-magnetic metering circuit board 8 is provided with a non-magnetic metering circuit, and the non-magnetic metering circuit is electrically connected to the controller;

[0073] The non-magnetic metering coil 9 is electrically connected to the non-magnetic metering circuit board 8. The non-magnetic metering coil 9 is arranged opposite to the irregular metal sheet 3. For example, the non-magnetic metering coil 9 is arranged directly opposite to the irregular metal sheet 3. It should be noted that there should be a certain gap between the non-magnetic metering coil 9 and the irregular metal sheet 3. The non-magnetic metering coil 9 can be etched on the non-magnetic metering circuit board 8.

[0074] In the present application, the non-magnetic metering circuit board 8 can emit ultrasonic electromagnetic waves of a specific frequency through the non-magnetic metering coil 9. The electromagnetic waves will undergo physical property changes after encountering the irregular metal sheet 3. The movement of the irregular metal sheet 3 causes the frequency, amplitude and phase of the electromagnetic waves to change. For example, when rotating, the irregular metal sheet 3 periodically cuts the electromagnetic field to generate a modulated signal. The non-magnetic metering circuit can convert the modulated signal into a steady-amplitude square wave, which is received and resolved by the controller, and finally outputs an accurate flow rate or number of rotations. The overall ventilation volume is then calculated based on the ventilation volume represented by one rotation of the irregular metal sheet 3.

[0075] In an optional embodiment, the non-magnetic metering circuit is integrated in the controller, which can avoid the non-magnetic metering circuit board 8 occupying too much space inside the gas meter base 1, thereby optimizing the space utilization inside the gas meter base 1. The non-magnetic metering coil 9 can be etched on the controller circuit board.

[0076] In an optional embodiment, the central axis of the non-magnetic metering coil 9 coincides with the central axis of the irregular metal sheet 3. This can make the pulse signal more regular, facilitate the calculation of the number of rotations of the irregular metal sheet 3, and improve the accuracy of ventilation calculation.

[0077] In an optional implementation, it also includes:

[0078] The display 6 is arranged on the housing 2 and connected to the controller. The display 6 is arranged opposite to the irregular metal sheet 3. Specifically, the output magnetic ring 5 and the irregular metal sheet 3 can be arranged between the display 6 and the housing 2. The non-magnetic metering coil 9 can be arranged between the display 6 and the irregular metal sheet 3, or connected and arranged on the display 6 on a side facing the irregular metal sheet 3.

[0079] In an optional implementation, the controller includes:

[0080] The main control chip is electrically connected to the non-magnetic metering circuit and the display 6 respectively. The main control chip is arranged on the controller circuit board, and the controller circuit board can also be arranged directly opposite to the irregular metal sheet 3. The main control chip can adopt the FM33LG048 platform, such as Fig.10As shown, the MCU main control chip is respectively provided with a burning interface and a 485 communication interface. In addition, the MCU main control chip is connected with a near-infrared communication module, a storage module, an NFC communication module, a button and an LED light, a valve drive module and a cover opening detection module. The operation button can make the valve drive module open the valve. The internal movement of the gas meter drives the transmission shaft to rotate through the pipeline gas pressure difference, and the internal magnetic ring 4 drives the output magnetic ring 5 to rotate, so that the semicircular metal sheet on the output magnetic ring 5 follows the rotation. The non-magnetic metering coil 9 can be installed directly opposite the semicircular metal sheet, and can collect the signal of the irregular metal sheet rotation. The irregular metal sheet rotates one circle, and the gas meter base meter 1 ventilation volume represented by the irregular metal sheet is fixed, which is called the rotation volume. The controller can obtain the ventilation volume of the gas meter base meter 1 by calculating the product of the number of rotations of the irregular metal sheet 3 and the rotation volume. Then it is displayed through the liquid crystal display 6 on the controller circuit board. When the remaining gas volume in the meter is 0, the valve of the gas meter base meter 1 will automatically close, the user will stop using gas, the LCD display 6 will show that the gas volume is insufficient, and the buzzer will sound to notify the user to purchase gas. The user can recharge the gas meter via NFC card or IC card at the gas company's business hall. After the remaining volume is greater than 0, the user can press the button to open the valve, and the user will resume normal gas use.

[0081] The gas meter base meter 1 also has 485 and near infrared communication functions, which can read various information stored in the meter for easy maintenance. Figure 3 As shown, the NFC antenna 11 and the liquid crystal display 6 can be arranged on the controller circuit board. Figure 7 As shown, the 485 communication interface of the gas meter PC can be connected to the arc fault detector AFD through a 485 line, and the gas meter base meter 1 is provided with a 485 line interface (485 line connector) connected to the controller. Figure 8 As shown, the gas meter PC can also be connected to the arc fault detector AFD through infrared rays, and the gas meter base meter 1 is provided with an infrared interface connected to the controller. The main control chip is also connected to the main power interface through a power management module, and the power management module may include a step-down circuit and an energy storage circuit. The power management module may be connected to a power detection module, and the power detection module may be connected to the main control chip.

[0082] In an optional implementation, the controller further includes:

[0083] NFC communication module, the NFC communication module is electrically connected to the main control chip, and the gas meter base meter 1 is provided with an NFC card reading area 10 arranged opposite to the NFC communication module, such as Figure 4 It can be known that the user puts the IC card close to the NFC card reading area 10, which facilitates the NFC communication module to read the information in the IC card and control the opening and closing of the gas meter.

[0084] In an optional implementation, the NFC communication module is connected to an NFC antenna 11. The NFC communication module can be connected to the overall control system of the gas meter through the NFC antenna 11 to facilitate data transmission between the user's smart gas meter and the overall control system of the gas meter.

[0085] In an optional embodiment, the controller further includes:

[0086] The contactless IC card reader / writer module is used to read the gas quantity information in the IC card and control the opening and closing of the gas meter.

[0087] This application removes the mechanical wheel counter and directly installs a semicircular metal sheet on the output magnetic ring 5 of the gas meter base 1, reducing the mechanical transmission of the counter wheel and directly integrating the non-magnetic metering module with the controller circuit board of the gas meter. The non-magnetic metering module is based on the principle of metal detection. It detects the rotation angle of the irregular metal sheet below it through the coil etched on the PCB. It has the advantages of complete anti-magnetism, low power consumption and strong anti-interference, and can accurately realize electromechanical conversion.

[0088] The intelligent gas meter without a mechanical wheel counter of the present application improves measurement accuracy, reduces maintenance costs, and reduces disputes and conflicts caused by electromechanical inconsistencies caused by the mechanical wheel counter.

[0089] The mechanical word wheel counter is removed, a semicircular metal sheet is directly installed on the output magnetic ring 5, a non-magnetic metering module is used for sampling, and the gas prepayment and valve control functions can be realized in combination with the contactless IC card technology.

[0090] The present application installs a semicircular metal sheet on the output magnetic ring 5, and then installs a non-magnetic metering module directly opposite to it, so as to realize electromechanical conversion. The rest of the hardware design can follow the existing mature smart gas meter hardware technical solutions.

[0091] This application can also be extended to water meters and heat meters.

[0092] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A smart gas meter, characterized in that: include: A gas meter base meter (1) is provided with a housing (2), and a movement is arranged in the housing (2); A magnetic transmission component, one end of which is connected to the transmission shaft of the movement, and the other end of which is connected to an irregular metal sheet (3); A non-magnetic metering module, arranged on the housing (2) and arranged opposite to the irregular metal sheet (3); The non-magnetic metering module is electrically connected to the controller.

2. The smart gas meter according to claim 1, characterized in that: The magnetic transmission assembly comprises: An internal magnetic ring (4) is located inside the housing (2), and the internal magnetic ring (4) is connected to a transmission shaft of the movement; An output magnetic ring (5) is located on a side of the housing (2) away from the internal magnetic ring (4); The irregular metal sheet (3) is arranged on a side of the output magnetic ring (5) away from the internal magnetic ring (4), and the internal magnetic ring (4) and the output magnetic ring (5) form a magnetic transmission.

3. The smart gas meter according to claim 2, characterized in that: The magnetic transmission assembly also includes: A bushing (7) is disposed through the housing (2), and the bushing (7) abuts between the internal magnetic ring (4) and the output magnetic ring (5).

4. The smart gas meter according to claim 1, characterized in that: The irregular metal sheet (3) is a semicircular metal sheet.

5. The smart gas meter according to claim 1, characterized in that: The non-magnetic metering module comprises: A non-magnetic metering circuit board (8) is provided with a non-magnetic metering circuit, and the non-magnetic metering circuit is electrically connected to the controller; The non-magnetic metering coil (9) is electrically connected to the non-magnetic metering circuit board (8), and the non-magnetic metering coil (9) is arranged opposite to the irregular metal sheet (3).

6. The smart gas meter according to claim 5, characterized in that: The central axis of the non-magnetic metering coil (9) coincides with the central axis of the irregular metal sheet (3).

7. The smart gas meter according to claim 5, characterized in that: Also includes: A display (6) is arranged on the housing (2) and is connected to the controller; the display (6) is arranged opposite to the irregular metal sheet (3).

8. The smart gas meter according to claim 7, characterized in that: The controller comprises: The main control chip is electrically connected to the non-magnetic metering circuit and the display (6) respectively.

9. The smart gas meter according to claim 8, characterized in that: The controller further comprises: An NFC communication module, the NFC communication module being electrically connected to the main control chip, and the gas meter base (1) being provided with an NFC card reading area (10) arranged opposite to the NFC communication module; The NFC communication module is connected to an NFC antenna (11).

10. The smart gas meter according to claim 1, characterized in that: The controller also includes: The contactless IC card reader / writer module is used to read the gas quantity information in the IC card and control the opening and closing of the gas meter.

Images