Electronic gas meter externally connected with anti-interference device

Abstract

According to the electronic gas meter externally connected with the anti-interference device, the shielding cover is additionally arranged, and the anti-interference circuit unit is combined, so that interference of an external magnetic field to a data line between the main control board and the metering module is avoided; and normal work of the metering module in the gas meter main body is prevented from being interfered by an external magnetic field through a binding post between the main control board and the metering module, and the measurement accuracy of the electronic gas meter is improved. By means of the design that the connecting pieces penetrate through the through holes and the connecting holes for fixed connection and common ground connection among the shielding cover, the gas meter body and the grounding bus is achieved, the electromagnetic compatibility and safety of the gas meter are improved, and the overall performance and stability of the system are enhanced. And through the design of the clamping piece, the connection stability between the circuit board and the binding post is improved, and the wiring terminal has very high practicability and convenience in practical application.

Description

Technical Field

[0001] The utility model relates to the field of electronic gas meters, and more specifically to the field of anti-interference electronic gas meters. Background Art

[0002] An electronic gas meter is a device used to measure and monitor the consumption of natural gas or liquefied petroleum gas in household or industrial use. This type of gas meter usually consists of a gas meter body and a main control board, wherein the gas meter body includes a main housing with a gas inlet and outlet and a metering module placed in the main housing for measuring the gas flow. The main control board is the central control unit of the gas meter and is placed outside the main body of the gas meter. The main control board and the main housing are respectively provided with terminals, and the data line connects the main control board and the metering module through the terminals. The main control board receives data from the metering module through the data line and processes and displays the gas flow. In the actual working scenario of the electronic gas meter, there will be electromagnetic waves generated by strong currents, high-voltage lines, electromagnetic equipment or other external factors in the surrounding area, which will interfere with the signal of the gas meter, thereby affecting the accuracy of gas measurement.

[0003] Patent number CN 214277058 U discloses a gas meter with anti-interference function. By designing a closed ring-shaped anti-interference cavity, the metering module is placed in the cavity to shield the magnetic field. However, this structure is not applicable to some gas meters where the metering module needs to transmit data with the external main control board through a data line. The strong electromagnetic field existing outside (such as strong interference equipment such as walkie-talkies) will interfere with various wiring PCBs on the main control board and the data lines connecting the main control board and the metering module, thereby affecting the normal operation of the metering module inside the gas meter body, thereby affecting the accuracy of gas measurement. Utility Model Content

[0004] The utility model aims to provide an electronic gas meter with an external anti-interference device to solve the interference of the external magnetic field on the data line between the main control board and the metering module, and prevent the external magnetic field from interfering with the normal operation of the metering module inside the gas meter body through the terminal between the main control board and the metering module, thereby improving the accuracy of gas meter measurement.

[0005] The utility model is realized through the following technical solutions:

[0006] An electronic gas meter with an external anti-interference device comprises a gas meter body and a main control board, wherein the gas meter body comprises a main shell and a metering module, the main shell and the main control board are both provided with wiring posts, and signal transmission is performed via data cables. The invention is characterized in that an anti-interference device is connected between the gas meter body and the main control board, the anti-interference device comprises a shielding cover for resisting electromagnetic interference and a cavity for accommodating the wiring posts and the data cables, and two ends of the shielding cover are respectively connected to the main shell and the main control board.

[0007] An electronic gas meter is usually composed of a gas meter body and a main control board, wherein the gas meter body includes a main shell with a gas inlet and outlet and a metering module placed in the main shell for measuring the gas flow. The main control board is the central control unit of the gas meter and is placed outside the gas meter body. The main control board and the main shell are respectively provided with the wiring posts, and the data line connects the main control board with the metering module through the wiring posts. The main control board receives data from the metering module through the data line and processes and displays the gas flow. In the actual working scenario of the electronic gas meter, there will be electromagnetic waves generated by strong currents, high-voltage lines, electromagnetic equipment or other external factors in the surrounding area, which will interfere with the signal of the gas meter, especially the interference of the external magnetic field on the data line between the main control board and the metering module, thereby affecting the accuracy of gas measurement.

[0008] The anti-interference device is provided between the gas meter body and the main control board. The anti-interference device is provided with a cavity for accommodating the terminal and the data line, and is also provided with the shielding cover for resisting electromagnetic interference. The shielding cover can be made of common metals such as iron and steel that can absorb, reflect or scatter magnetic fields. The two ends of the shielding cover are respectively connected to the main body shell and the main control board, providing a closed structure of metal material for the terminal and the data line, thereby shielding the external magnetic field.

[0009] This type of electronic gas meter with an external anti-interference device solves the problem of interference of the external magnetic field on the data line between the main control board and the metering module by adding a shielding cover, and prevents the external magnetic field from interfering with the normal operation of the metering module inside the gas meter body through the terminal between the main control board and the metering module, thereby improving the measurement accuracy of the electronic gas meter.

[0010] As a preferred embodiment of the present invention, the cavity further contains a circuit board, and the circuit board is provided with an anti-interference circuit unit connected in series to the main control board and the metering module.

[0011] Unstable power supply, voltage fluctuations or other module devices near the power line inside the gas meter may also generate high-frequency noise and interfere with the signal data through the transmitted data line. The external shielding cover cannot solve the impact of such interference on the data signal of the gas meter. The anti-interference circuit unit is arranged inside the cavity, and the anti-interference circuit unit is connected in series to the transmission data line between the main control board and the gas meter body, so as to filter out the high-frequency noise generated by the unstable power supply, voltage fluctuations or other module devices near the power line inside the gas meter, thereby improving the measurement accuracy of the electronic gas meter.

[0012] The anti-interference circuit unit can use mature high-frequency filters in the prior art, such as low-pass filters, band-pass filters, etc. These high-frequency filters can filter out high-frequency noise in the data line by being connected in series to the data line, thereby filtering out high-frequency noise caused by unstable power supply, voltage fluctuations inside the gas meter, or other module devices near the power line, thereby improving the accuracy of electronic gas meter measurement. Magnetic beads, as a common circuit unit for filtering and suppressing high-frequency interference in the prior art, can also be connected in series to the data line as the anti-interference circuit unit to filter out high-frequency noise in the data line and improve the accuracy of electronic gas meter measurement.

[0013] As a preferred embodiment of the present invention, the anti-interference circuit unit is an LC filter, the LC filter contains magnetic beads and capacitors, one end of the capacitor is connected to the magnetic beads, and the other end is connected to the shielding cover, and the main housing and the shielding cover are grounded.

[0014] The LC filter is a bandpass filter commonly used in the prior art. By connecting the magnetic bead to one end of the capacitor and grounding the other end of the capacitor, a parallel resonant circuit is formed to filter out high-frequency noise. The filtering characteristics of the LC filter can also be adjusted by selecting appropriate magnetic beads and capacitor specifications, thereby effectively filtering high-frequency noise within a specific frequency range and meeting the filtering requirements for signals in different application scenarios.

[0015] In order to ensure safety and prevent static electricity accumulation from damaging the internal electronic components of the device, the main housing will be grounded to help guide any undesirable current to the ground, thereby reducing the risk of electric shock and preventing static electricity accumulation. Since the ground terminal of the capacitor is directly connected to the shielding cover, and the shielding cover is seamlessly connected to the main housing as a conductor, the ground terminal of the capacitor is directly grounded with the main housing. By directly sharing the ground terminal of the capacitor with the housing, the main housing can be made into an equipotential body of the capacitor. This equipotential connection method can effectively reduce or eliminate the impact of static electricity or electromagnetic interference caused by voltage difference on electronic components, thereby improving the overall performance and stability of the gas meter. Compared with connecting the ground terminal of the capacitor to the ground wire in the data line, the ground terminal of the capacitor is directly grounded with the main housing, which can also simplify the circuit design of the gas meter and avoid the possible breakage of the ground wire or poor contact, thereby affecting the performance and stability of the gas meter.

[0016] In addition, by connecting the ground terminal of the capacitor directly to the shell, the entire gas meter can form a complete conductive system, thereby enhancing its electromagnetic compatibility, enabling it to better resist external electromagnetic interference and ensure the accuracy and stability of measurement. In contrast, if the ground terminal of the capacitor is connected to the ground wire in the data line, additional electromagnetic interference may be introduced, affecting the performance and stability of the gas meter.

[0017] At the same time, by directly connecting the ground terminal of the capacitor to the housing, if a circuit failure or other problem occurs, maintenance personnel can quickly locate the problem by checking the grounding condition of the capacitor, thereby improving maintenance efficiency and shortening maintenance time. In contrast, if the ground terminal of the capacitor is connected to the ground wire in the data line, it is necessary to check whether the entire data line has a fault or poor contact, which increases the difficulty and time of maintenance.

[0018] To sum up, the advantage of connecting the ground terminal of the capacitor directly to the circuit ground terminal compared to sharing the ground with the main casing is that it better protects the electronic components inside the gas meter, improves the overall performance and stability of the gas meter, simplifies circuit design, reduces production costs and maintenance costs, and improves the overall reliability and stability of the gas meter.

[0019] As a preferred embodiment of the present invention, the anti-interference device contains a fixed connecting part, which includes a connecting hole located on the circuit board, a through hole on the shielding cover, and a connecting member, and the connecting member achieves a fixed connection among the anti-interference circuit unit, the shielding cover and the main shell through the through hole and the connecting hole.

[0020] The anti-interference circuit unit, the shielding cover and the main housing are fixedly connected in a stable and effective manner by the connecting member passing through the through hole and the connecting hole. This design can ensure that the anti-interference circuit unit, the shielding cover and the main housing can remain stable in various environments and conditions to prevent loosening or displacement caused by vibration, temperature changes or external factors. It can also ensure that data signal transmission is not interfered by external vibration factors to generate interference signals that affect the accuracy of data.

[0021] In addition, this fixed connection method is also conducive to simplifying the production process and improving production efficiency. During the assembly process, through the cooperation of the connector, the through hole and the connection hole, the installation of the anti-interference circuit unit, the shielding cover and the gas meter body can be completed quickly and accurately, reducing the assembly time and labor costs.

[0022] In summary, this design of fixed connection through a connecting piece passing through the through hole and the connecting hole not only enhances the anti-interference performance of the gas meter, but also optimizes the production process and improves production efficiency.

[0023] As a preferred embodiment of the present invention, the fixed connection parts contain multiple ones and are symmetrically arranged based on the anti-interference device.

[0024] The fixed connection part is designed to contain multiple and symmetrically arranged based on the anti-interference device. Such a structure helps to improve the stability and reliability of the equipment, and also helps to reduce the impact of external interference on the performance of the equipment. First of all, the setting of multiple fixed connection parts can provide more stable support, so that the equipment can maintain a stable working state under various working conditions. In addition, the symmetrical setting design can ensure that the equipment can disperse the force more evenly when subjected to external forces, thereby avoiding distortion or deformation of the equipment.

[0025] In summary, the preferred solution of the utility model has multiple fixed connection parts and is based on the design of symmetrical arrangement of the anti-interference device, which has the advantages of improving the stability and reliability of the device and reducing the impact of external interference on the performance of the device. In practical applications, corresponding adjustments and optimizations can be made according to specific needs and scenarios to obtain better use effects.

[0026] As a preferred embodiment of the utility model, a ground bus is provided on the circuit board, the connecting hole is located at the ground bus, and the connecting piece is a conductive body, so as to realize a common ground for the ground bus, the shielding cover and the main housing.

[0027] In order to improve the shielding effect and safety, the grounding lines in all the circuits on the circuit board are merged into one ground bus, and the connection holes are located on the ground bus. The connector is used as a conductive body to connect the ground bus, the shielding cover and the main body shell. In this scheme, the connector can be made of conductive bodies such as copper columns or stainless steel to ensure smooth transmission of current and good conductivity. Through such a design, the shielding cover, the gas meter body and the ground bus form a common ground system. This not only enhances the anti-interference ability of the system, but also significantly improves the safety and stability of the gas meter during use. The establishment of a common ground system is crucial to improving the electromagnetic compatibility of the entire system. In a complex electromagnetic environment, the common ground design can effectively suppress electromagnetic interference and reduce signal distortion, thereby ensuring accurate measurement and stable operation of the gas meter. In addition, the design also helps to release static electricity and prevent static electricity accumulation from damaging electronic components. This enhances the service life and reliability of the gas meter to a certain extent.

[0028] In summary, by providing a ground bus on the circuit board, locating the connection hole at the ground bus, and using the conductive connector, a common ground connection is achieved among the shielding cover, the gas meter body, and the ground bus. This design not only improves the electromagnetic compatibility and safety of the gas meter, but also helps to enhance the overall performance and stability of the system.

[0029] As a preferred embodiment of the present invention, the cavity contains a clamping part that is clamped to the terminal, and the clamping part includes a fixing part, and an elastic part that is connected to the fixing part and can be deformed perpendicular to the extension direction of the terminal, and the elastic part has one end close to the circuit board that contacts the terminal.

[0030] A clamping piece that is clamped with the terminal is provided in the cavity, and is used to clamp the terminal. The fixing part and the elastic part are provided. The fixing part is used to provide stability when the clamping piece is clamped with the terminal, while the elastic part can be deformed perpendicular to the extension direction of the terminal to adapt to terminals of different sizes. The elastic part can contact the terminal at one end close to the circuit board, forming a stable connection between the clamping piece and the terminal, making the clamping action smoother, and avoiding the terminal not being aligned with the cavity during clamping, thereby causing damage to the device. In addition, the design of the clamping piece also takes into account the convenience of maintenance and replacement. When the circuit board needs to be replaced or repaired, the clamping piece can be easily disassembled with simple operations, making the whole process quick and convenient.

[0031] In summary, the design of the clamping piece of the utility model not only improves the connection stability between the circuit board and the terminal, but also has high practicality and convenience in practical applications.

[0032] In summary, the utility model has the following beneficial effects:

[0033] 1. By adding a shielding cover and combining an anti-interference circuit unit, the interference of the external magnetic field on the data line between the main control board and the metering module is solved, and the external magnetic field is prevented from interfering with the normal operation of the metering module inside the gas meter body through the terminal between the main control board and the metering module, thereby improving the measurement accuracy of the electronic gas meter.

[0034] 2. Directly sharing the ground terminal of the anti-interference circuit unit with the main casing can better protect the electronic components inside the gas meter, improve the overall performance and stability of the gas meter, simplify circuit design, reduce production costs and maintenance costs, and improve the overall reliability and stability of the gas meter.

[0035] 3. The design of fixing the connection by connecting parts through the through holes and the connecting holes and realizing the common ground connection among the shielding cover, the gas meter body and the grounding bus not only improves the electromagnetic compatibility and safety of the gas meter, but also helps to enhance the overall performance and stability of the system.

[0036] 4. The design of arranging a card connector in the cavity not only improves the connection stability between the circuit board and the terminal, but also has high practicality and convenience in actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the overall assembly diagram of the gas meter;

[0038] Figure 2 It is a schematic diagram of the structure of the anti-interference device;

[0039] Figure 3 1. It is a schematic diagram of the structure of the card connector;

[0040] Figure 4 This is the anti-interference circuit unit diagram.

[0041] In the figure: 1. gas meter body, 11. main body shell, 12. metering module, 2. main control board, 3. terminal, 4. anti-interference device, 41. shielding cover, 42. cavity, 43. circuit board, 44. fixed connection part, 441. connecting hole, 442. through hole, 443. connector, 45. snap-on part, 451. fixed part, 452. elastic part. DETAILED DESCRIPTION

[0042] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0044] like Figure 1 As shown, the gas meter body 1 contains a metering module 12 for measuring gas flow, which is located in the main housing 11. The signal data in the metering module 12 is connected to the terminal 3 on the main housing 11 through a data line, and is connected to the terminal 3 on the main control board 2 through an anti-interference device 4. The main control board 2 receives the data from the metering module 12 through the data line and processes and displays the gas flow.

[0045] Among them, Figure 2 As shown, the anti-interference device 4 includes a shielding cover 41 for anti-electromagnetic interference. The shielding cover 41 can be made of common metals such as iron and steel that can absorb, reflect or scatter magnetic fields. The two ends of the shielding cover 41 are respectively connected to the main housing 11 and the main control board 2, providing a closed structure of metal material for the terminal 3 and the data line, thereby shielding the external magnetic field.

[0046] The shielding cover 41 has a built-in cavity 42 for accommodating the terminals 3 and the circuit board 43 on both sides. The circuit board 43 is provided with an anti-interference circuit unit, and is connected in series with the terminals 3 on both sides through data lines. The connector 443 passes through the through hole 442 and the connecting hole, so that the anti-interference circuit unit, the shielding cover 41 and the main housing 11 are fixedly connected in a stable and effective manner. Prevent loosening or displacement caused by vibration, temperature changes or external factors. It can also ensure that the data signal transmission is not interfered by external vibration factors to generate interference signals that affect the accuracy of the data. Among them, the connection hole is located at the ground bus on the circuit board 43. The connector 443 acts as a conductive body to connect the ground bus and the shielding cover 41 and the main housing 11.

[0047] In this solution, the connector 443 can use a combination of screws and nuts made of conductive materials such as copper columns or stainless steel in the prior art to ensure smooth transmission of current and good conductivity. Through such a design, the shielding cover 41, the gas meter body 1 and the grounding bus form a common ground system. This not only enhances the anti-interference ability of the system, but also significantly improves the safety and stability of the gas meter during use. The establishment of a common ground system is crucial to improving the electromagnetic compatibility of the entire system. In a complex electromagnetic environment, the common ground design can effectively suppress electromagnetic interference and reduce signal distortion, thereby ensuring accurate measurement and stable operation of the gas meter. In addition, the design also helps to release static electricity and prevent static electricity accumulation from damaging electronic components. This enhances the service life and reliability of the gas meter to a certain extent.

[0048] like Figure 3 The shown cavity 42 is also provided with a clamping member 45 for clamping the terminal 3. When the terminal 3 enters the cavity 42 inside the anti-interference device 4, the end of the elastic part 452 close to the circuit board 43 can contact the terminal 3 and deform in a direction perpendicular to the extension of the terminal 3, thereby giving the terminal 3 a reaction force to make the clamping more stable. The fixing part 451 is used to provide a supporting force to one end of the elastic part 452 to improve the stability of the device. The clamping member 45 of this structure can adapt to terminals 3 of different sizes. And while forming a stable connection between the clamping member 45 and the terminal 3, the clamping action is smoother, avoiding the terminal 3 not aligning with the cavity 42 during clamping, thereby causing damage to the device. In addition, the design of the clamping member 45 also takes into account the convenience of maintenance and replacement. When the circuit board 43 needs to be replaced or repaired, the clamping member 45 can be easily disassembled with a simple operation, making the whole process fast and convenient.

[0049] The anti-interference circuit unit can use mature high-frequency filters in the prior art, such as low-pass filters, band-pass filters, etc. These high-frequency filters can filter out high-frequency noise in the data line by being connected in series to the data line, thereby filtering out high-frequency noise caused by unstable power supply, voltage fluctuations inside the gas meter, or other module devices near the power line, thereby improving the accuracy of electronic gas meter measurements. Magnetic beads, as a common circuit unit for filtering and suppressing high-frequency interference in the prior art, can also be connected in series to the data line as an anti-interference circuit unit to filter out high-frequency noise in the data line and improve the accuracy of electronic gas meter measurements.

[0050] In this embodiment, the anti-interference circuit unit is as follows: Figure 4 As shown, J1 is the output serial port of the metering module 12, which outputs five channels of data, and each channel of data is transmitted to the receiving serial port J2 of the general control module after passing through the anti-interference circuit unit. The anti-interference circuit unit is a combination of 6 magnetic beads, and the number of magnetic beads can be adjusted according to the intensity of the corresponding external electromagnetic interference. A capacitor can also be connected to the output end of each magnetic bead to form an LC filter circuit, and the other end of the capacitor is directly connected to the main housing 11 through the ground bus and the connector 443. In addition, the filtering characteristics of the LC filter can be adjusted by selecting suitable magnetic beads and capacitor specifications, so as to achieve effective filtering of high-frequency noise within a specific frequency range, and meet the filtering requirements of signals in different application scenarios.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electronic gas meter with an external anti-interference device, comprising a gas meter body (1) and a main control board (2), wherein the gas meter body (1) comprises a main body shell (11) and a metering module (12), the main body shell (11) and the main control board (2) are both provided with a terminal (3), and signal transmission is performed via a data line, wherein: An anti-interference device (4) is connected between the gas meter body (1) and the main control board (2), the anti-interference device (4) comprising a shielding cover (41) for resisting electromagnetic interference and a cavity (42) for accommodating the terminal (3) and the data line, and two ends of the shielding cover (41) are respectively fitted and connected to the main body shell (11) and the main control board (2).

2. The electronic gas meter with an external anti-interference device according to claim 1, characterized in that: The cavity (42) also contains a circuit board (43), on which an anti-interference circuit unit connected in series with the main control board (2) and the metering module (12) is provided.

3. The electronic gas meter with an external anti-interference device according to claim 2, characterized in that: The anti-interference circuit unit is an LC filter, the LC filter comprises a magnetic bead and a capacitor, one end of the capacitor is connected to the magnetic bead, and the other end is connected to the shielding cover (41), and the main housing (11) and the shielding cover (41) are grounded.

4. The electronic gas meter with an external anti-interference device according to claim 3, characterized in that: The anti-interference device (4) includes a fixed connection portion (44), the fixed connection portion (44) includes a connection piece (443), a connecting hole (441) located on the circuit board (43), and a through hole (442) located on the shielding cover (41), and the connection piece (443) is connected to the through hole (442) and the connecting hole (441) to achieve fixed connection among the anti-interference circuit unit, the shielding cover (41), and the main housing (11).

5. The electronic gas meter with an external anti-interference device according to claim 4, characterized in that: A plurality of the fixed connection parts (44) are symmetrically arranged based on the anti-interference device (4).

6. The electronic gas meter with an external anti-interference device according to claim 4, characterized in that: A grounding bus is provided on the circuit board (43), the connecting piece (443) is located at the grounding bus, and the connecting piece (443) is a conductive body, thereby achieving a common ground for the grounding bus, the shielding cover (41) and the main housing (11).

7. An electronic gas meter with an external anti-interference device according to any one of claims 2 to 6, characterized in that: The cavity (42) contains a clamping member (45) clamped to the terminal (3), the clamping member (45) comprising a fixing portion (451) and an elastic portion (452) connected to the fixing portion (451) and deformable perpendicularly to the extension direction of the terminal (3), the elastic portion (452) having an end close to the circuit board (43) in contact with the terminal (3).

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