Device for unifying interfaces of gas flow meter and controller

Abstract

The utility model provides a device with unified interfaces of a gas flow meter and a controller, and in order to realize real plug-and-play experience, comprehensive standardized design is carried out on physical interfaces, including accurate pin layout definition. By means of the design, any flowmeter meeting the standard can be in butt joint with the controller easily, cumbersome adapters or conversion equipment is not needed, the installation process is greatly simplified, and the operation and maintenance cost is reduced. By means of the arrangement, the cost of equipment purchase, installation and later maintenance can be remarkably reduced, remarkable economic benefits and social benefits can be brought to the natural gas industry by improving the overall efficiency and safety of the system, and the system is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] This utility model belongs to the field of gas metering and control, and specifically relates to a device with a unified interface between a gas flow meter and a controller. Background Technology

[0002] The natural gas metering system consists of a variety of precision instruments, among which the flow meter, as the core component, directly undertakes the task of accurately measuring the volumetric flow rate of natural gas, and its performance is directly related to the accuracy and reliability of the metering data. Meanwhile, the natural gas valve controller, as the guardian of the safe operation of the pipeline system, ensures the safety, stability, and efficiency of the natural gas transportation process by precisely controlling the opening and closing of valves, and is an indispensable key device in the natural gas transmission and distribution network.

[0003] The current market offers a variety of interface types for flow meters and valve controllers, lacking a unified standard. This not only increases the complexity of equipment procurement, installation, and maintenance but may also lead to compatibility issues between different brands, affecting the overall system's operational efficiency and stability. Therefore, developing a device with a unified interface for gas flow meters and controllers to achieve seamless connection and efficient collaboration between devices is of great significance for improving natural gas metering and management, and promoting the standardization and intelligent development of the industry. Utility Model Content

[0004] The purpose of this invention is to provide a device with a unified interface for gas flow meters and controllers, in order to solve the problem of poor compatibility between different devices caused by the non-unified interfaces of flow meters and valve controllers in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A device with a unified interface for a gas flow meter and controller includes an adapter box; the adapter box contains an adapter circuit board, and the adapter circuit board integrates an adapter circuit.

[0007] The aforementioned adapter circuit includes a main power supply, an MCU circuit, a controller interface circuit, a flow meter interface circuit, and a flow meter type and address interface circuit.

[0008] The main power supply is connected to the MCU circuit, controller interface circuit, flow meter interface circuit, flow meter type and address interface circuit respectively;

[0009] The MCU circuit is also connected to the controller interface circuit, the flow meter interface circuit, and the flow meter type and address interface circuit, respectively.

[0010] The adapter box is provided with an aviation plug and at least one PG connector on each side;

[0011] The controller interface circuit of the adapter circuit board is connected to the controller via an aviation connector;

[0012] The flow meter interface circuit of the adapter circuit board is connected to the flow meter via a PG connector.

[0013] This utility model also has the following features:

[0014] Furthermore, the adapter box is equipped with two PG connectors.

[0015] Furthermore, the main power supply voltage is 12V.

[0016] Furthermore, the MCU circuit includes a control chip U1 and peripheral circuitry;

[0017] The control chip U1 mentioned above uses HD_003;

[0018] The voltage regulator circuit includes a downloader interface J1, capacitors C1, C2, C3, C4, and C5, a resistor R9, diodes D1 and D2, and a voltage regulator chip U3.

[0019] The voltage regulator chip U3 mentioned above is 26210A-36PG;

[0020] The 8th pin of the control chip U1, one end of capacitor C1 and one end of capacitor C2 are connected together, and the 9th pin of the control chip U1 is connected to one end of capacitor C3; the other ends of capacitor C1, capacitor C2 and capacitor C3 and the 7th pin of the control chip U1 are grounded together.

[0021] Pin 12 of the control chip U1 is connected to one end of resistor R9, the other end of resistor R9 is connected to the positive terminal of diode D1, and the negative terminal of diode D1 is grounded.

[0022] Pins 1, 2, 3, 4, and 5 of the downloader interface J1 are connected to pins 9, 7, 17, 18, and 4 of the control chip U1, respectively.

[0023] The positive terminal of diode D2 is connected to the main power supply as the input terminal of the MCU circuit, and the negative terminal of diode D2 is connected to pin 2 of voltage regulator chip U3 and the positive terminal of capacitor C4.

[0024] The negative terminal of capacitor C4, pin 1 of voltage regulator chip U3, and the negative terminal of capacitor C5 are all grounded; the positive terminal of capacitor C5, pin 3 of voltage regulator chip U3, and pin 9 of control chip U1 are all connected together. This connection point serves as the output terminal of the MCU circuit and is connected to the controller interface circuit, flow meter interface circuit, flow meter type, and address interface circuit respectively.

[0025] Furthermore, the controller interface circuit includes interface J2, interface J3, communication chip U5, resistor R18, resistor R19 and resistor R20;

[0026] The communication chip U5 mentioned above uses the MAX485.

[0027] Pin 1 of the communication chip U5 is connected to pin 14 of the control chip U1;

[0028] Pins 2 and 3 of the communication chip U5 are connected to pin 11 of the control chip U1;

[0029] Pin 4 of the communication chip U5 is connected to pin 13 of the control chip U1;

[0030] Pin 5 of the aforementioned communication chip U5 is grounded;

[0031] The communication chip U5 has 6 pins, one end of resistor R19, one end of resistor R20, and 3 pins of interface J2 connected together; the other end of resistor R20 is connected to the output terminal of the MCU circuit.

[0032] The 7th pin of the communication chip U5, the other end of resistor R19, one end of resistor R18, and the 2nd pin of interface J2 are connected together; the other end of resistor R18 is grounded.

[0033] The 8 pins of the communication chip U5 are connected to the output of the MCU circuit;

[0034] Pin 1 of interface J2 is grounded, and pin 4 of interface J2 is connected to the positive terminal of diode D2.

[0035] The pins of interface J3 are connected to the corresponding ports of the controller and then to the corresponding ports of the flow meter.

[0036] Furthermore, the flow meter interface circuit includes a communication chip U6, resistors R21, R22, and R23, and an interface J4;

[0037] The communication chip U6 mentioned above uses the MAX485.

[0038] The aforementioned interface J4 is formed by sequentially assembling three IX3 / 3.5 interfaces;

[0039] Pin 1 of the communication chip U6 is connected to pin 5 of the control chip U1;

[0040] Pins 2 and 3 of the communication chip U6 are connected to pin 3 of the control chip U1;

[0041] The 4th pin of the communication chip U6 is connected to the 6th pin of the control chip U1;

[0042] Pin 5 of the communication chip U6 is grounded;

[0043] The 6th pin of the communication chip U6, one end of resistor R22, one end of resistor R23, and the 9th pin of interface J4 are connected together; the other end of resistor R23 is connected to the output terminal of the MCU circuit.

[0044] The 7th pin of the communication chip U6, one end of resistor R21, and the 8th pin of interface J4 are connected together; the other end of resistor R21 is grounded.

[0045] The 8 pins of the communication chip U6 are connected to the output terminal of the MCU circuit.

[0046] Furthermore, the flow meter type and interface circuit include switch S1, IO expansion chip U2, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7 and resistor R8.

[0047] The aforementioned IO expansion chip U2 uses the TA9555;

[0048] Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the U2 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the switch S1, respectively. Resistors R1, R2, R3, R4, R5, R6, R7, and R8 are also connected sequentially between the pins of the IO expansion chip U2 and the switch S1.

[0049] The other ends of resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all connected to the output terminal of the MCU circuit.

[0050] Pins 9, 10, 11, 12, 13, 14, 15, and 16 of the switch S1 are all grounded.

[0051] Pins 5 and 8 of the aforementioned IO expansion chip U2 are grounded;

[0052] Pins 9, 7, and 6 of the IO expansion chip U2 are connected to pins 19, 1, and 2 of the control chip U1, respectively.

[0053] Pins 14 and 15 of the IO expansion chip U2 are connected to pins 16 and 15 of the control chip U1, respectively.

[0054] The 16 pins of the IO expansion chip U2 are connected to the output of the MCU circuit.

[0055] Furthermore, the flow meter type and interface circuit also includes switch S2, IO expansion chip U4, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16 and resistor R17.

[0056] The aforementioned IO expansion chip U4 uses the TA9555;

[0057] Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the IO expansion chip U4 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the switch S2, respectively. Resistors R10, R11, R12, R13, R14, R15, R16, and R17 are also connected sequentially between the pins of the IO expansion chip U4 and the switch S2.

[0058] The other ends of resistors R10, R11, R12, R13, R14, R15, R16, and R17 are all connected to the output terminal of the MCU circuit.

[0059] Pins 9, 10, 11, 12, 13, 14, 15, and 16 of the switch S2 are all grounded.

[0060] Pins 5 and 8 of the aforementioned IO expansion chip U4 are grounded;

[0061] Pins 9, 7, and 6 of the IO expansion chip U4 are connected to pins 19, 1, and 2 of the control chip U1, respectively.

[0062] Pins 14 and 15 of the IO expansion chip U4 are connected to pins 16 and 15 of the control chip U1, respectively.

[0063] The 16 pins of the IO expansion chip U4 are connected to the output of the MCU circuit.

[0064] Compared with the prior art, this utility model has the following technical effects:

[0065] This utility model presents a unified interface device for gas flow meters and controllers. To achieve a true plug-and-play experience, the physical interface has been fully standardized, including precise pin layout definitions. This design allows for easy interface connection with any standard-compliant flow meter and controller, eliminating the need for cumbersome adapters or conversion devices, greatly simplifying the installation process and reducing maintenance costs. This approach not only significantly reduces the costs of equipment procurement, installation, and subsequent maintenance, but also brings significant economic and social benefits to the natural gas industry by improving overall system efficiency and safety, making it suitable for large-scale industrial use and promotion. Attached Figure Description

[0066] Figure 1 This is a structural diagram of the device with a unified interface between the gas flow meter and the controller of this utility model;

[0067] Figure 2 This is the MCU circuit diagram of this utility model;

[0068] Figure 3 This is the controller interface circuit diagram of this utility model;

[0069] Figure 4 This is the flow meter interface circuit in this utility model;

[0070] Figure 5 This is the circuit diagram for selecting the address and type of the flow meter in this utility model.

[0071] The labels in the diagram represent: 1. Adapter box; 2. Adapter circuit board; 3. Aviation connector; 4. PG connector. Detailed Implementation

[0072] It should be noted that, unless otherwise specified, all components in this utility model are components known in the prior art.

[0073] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0074] A device for unifying the interface of a gas flow meter and a controller includes an adapter box 1; the adapter box 1 is provided with an adapter circuit board 2, which integrates an adapter circuit, including a main power supply, an MCU circuit, a controller interface circuit, a flow meter interface circuit, and a flow meter type and address interface circuit.

[0075] The main power supply is connected to the MCU circuit, controller interface circuit, flow meter interface circuit, and flow meter type and address interface circuit, respectively.

[0076] The MCU circuit is also connected to the controller interface circuit, the flow meter interface circuit, and the flow meter type and address interface circuit, respectively.

[0077] The adapter box 1 is equipped with an aviation plug 3 and at least one PG connector 4 on each side;

[0078] The controller interface circuit of the adapter circuit board 2 is connected to the controller via the aviation plug 3;

[0079] The flow meter interface circuit of the adapter circuit board 2 is connected to the flow meter through the PG connector 4.

[0080] As a preferred option, the adapter box is equipped with two PG connectors 4.

[0081] As a preferred option, the main power supply voltage is 12V.

[0082] Specifically, the MCU circuit includes a control chip U1 and a voltage regulator circuit;

[0083] The control chip U1 uses HD_003;

[0084] The voltage regulator circuit includes a downloader interface J1, capacitors C1, C2, C3, C4, and C5, a resistor R9, diodes D1 and D2, and a voltage regulator chip U3.

[0085] The voltage regulator chip U3 uses 26210A-36PG;

[0086] Pin 8 of control chip U1, one end of capacitor C1 and one end of capacitor C2 are connected together, and pin 9 of control chip U1 is connected to one end of capacitor C3; the other ends of capacitor C1, capacitor C2 and capacitor C3 and pin 7 of control chip U1 are grounded together.

[0087] Pin 12 of the control chip U1 is connected to one end of resistor R9, the other end of resistor R9 is connected to the positive terminal of diode D1, and the negative terminal of diode D1 is grounded.

[0088] Pins 1, 2, 3, 4, and 5 of the downloader interface J1 are connected to pins 9, 7, 17, 18, and 4 of the control chip U1, respectively.

[0089] The positive terminal of diode D2 is connected to the main power supply, and the negative terminal of diode D2 is connected to pin 2 of voltage regulator chip U3 and the positive terminal of capacitor C4.

[0090] The negative terminal of capacitor C4, pin 1 of voltage regulator chip U3, and the negative terminal of capacitor C5 are all grounded; the positive terminal of capacitor C5, pin 3 of voltage regulator chip U3, and pin 9 of control chip U1 are all connected together, and this connection point serves as the output terminal of the MCU circuit.

[0091] When communicating with the controller, the power supply for the control chip U1 is enabled by the 12V main power supply. This is achieved through the positive terminal of diode D2, and the negative terminal of diode D2 is connected to pin 2 of the voltage regulator chip U3. The input of voltage regulator chip U3 is connected to the positive terminal of a 100nF capacitor C4, and the negative terminal of capacitor C4 is connected to GND. Pin 1 of voltage regulator chip U3 is connected to GND, and pin 3 outputs a stable voltage VCC (3.3V) to supply power to the control chip U1. The output of pin 3 is connected to the positive terminal of a 100nF capacitor C5, and the negative terminal of C5 is connected to GND, serving as power supply filtering and decoupling.

[0092] It should be noted that this embodiment only shows the circuit structure and the connection relationship between circuit components. The control or communication between the chip and the controller or flow meter is known in the prior art and is not within the scope of this embodiment. Those skilled in the art are capable of using known existing algorithms to control or communicate according to the model of the controller or flow meter. This embodiment does not include any improvement to the algorithm.

[0093] Among them, the downloader interface J1 adopts Header5; the specifications of capacitors C1, C2, C3, C4, C5 and resistor R9 are 100nf, 4.7Uf, 100nf, 100nf, 100nf and 10KΩ respectively;

[0094] Diode D2 is an SS12.

[0095] Specifically, the controller interface circuit includes interface J2, interface J3, communication chip U5, resistor R18, resistor R19 and resistor R20;

[0096] The communication chip U5 uses MAX485; interfaces J2 and J3 both use 5264_4A.

[0097] Pin 1 of the communication chip U5 is connected to pin 14 of the control chip U1;

[0098] Pins 2 and 3 of the communication chip U5 are connected to pin 11 of the control chip U1;

[0099] Pin 4 of the communication chip U5 is connected to pin 13 of the control chip U1;

[0100] Pin 5 of the communication chip U5 is grounded;

[0101] The communication chip U5's 6 pins, one end of resistor R19, one end of resistor R20, and the interface J2's 3 pins are connected together; the other end of resistor R20 is connected to the MCU circuit output.

[0102] Pin 7 of communication chip U5, the other end of resistor R19, one end of resistor R18, and pin 2 of interface J2 are connected together; the other end of resistor R18 is grounded.

[0103] The 8 pins of the communication chip U5 are connected to the output of the MCU circuit;

[0104] Pin 1 of interface J2 is grounded, and pin 4 of interface J2 is connected to the positive terminal of diode D2.

[0105] Among them, the ICK+, ICK-, disconnection, low power, and GND terminals of interface J3 are connected to the corresponding ports of the controller and then transferred to the corresponding ports of the flow meter interface.

[0106] The specifications for resistors R18, R19, and R20 are 100KΩ, 120KΩ, and 100KΩ, respectively.

[0107] Specifically, the flow meter interface circuit includes communication chip U6, resistors R21, R22, and R23, and interface J4;

[0108] The communication chip U6 uses the MAX485.

[0109] Since the wiring sequence of flow meters from different brands is different, this embodiment has reserved a terminal block for easy wiring by users. Interface J4 is formed by sequentially combining three IX3 / 3.5 interfaces.

[0110] Pin 1 of the communication chip U6 is connected to pin 5 of the control chip U1;

[0111] Pins 2 and 3 of the communication chip U6 are connected to pin 3 of the control chip U1;

[0112] Pin 4 of the communication chip U6 is connected to pin 6 of the control chip U1;

[0113] Pin 5 of the communication chip U6 is grounded;

[0114] The 6th pin of the communication chip U6, one end of resistor R22, one end of resistor R23, and the 9th pin of interface J4 are connected together; the other end of resistor R23 is connected to the output of the MCU circuit.

[0115] Pin 7 of the communication chip U6, one end of resistor R21, and pin 8 of interface J4 are connected together; the other end of resistor R21 is grounded.

[0116] The 8 pins of the communication chip U6 are connected to the output of the MCU circuit;

[0117] The resistance values ​​of resistors R21, R22, and R23 are 100KΩ, 120KΩ, and 100KΩ, respectively.

[0118] Among them, pins 1, 2, 3, 4, 5, and 6 of J4 do not undergo electrical changes; they only serve as adapters to accommodate flow meters or controllers of different brands and specifications.

[0119] Pin 7 of J4 is connected to the corresponding port of the flow meter.

[0120] Specifically, the flow meter type and interface circuit include switch S1, IO expansion chip U2, resistors R1, R2, R3, R4, R5, R6, R7 and R8.

[0121] The IO expansion chip U2 uses the TA9555;

[0122] Pins 10, 11, 12, 13, 1, 2, 3, and 4 of U2 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of switch S1, respectively. Resistors R1, R2, R3, R4, R5, R6, R7, and R8 are also connected sequentially between the pins of the IO expansion chip U2 and the pins of switch S1.

[0123] The other ends of resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all connected to the output terminal of the MCU circuit.

[0124] Pins 9, 10, 11, 12, 13, 14, 15, and 16 of switch S1 are all grounded;

[0125] Pins 5 and 8 of the IO expansion chip U2 are grounded;

[0126] Pins 9, 7, and 6 of the IO expansion chip U2 are connected to pins 19, 1, and 2 of the control chip U1, respectively.

[0127] Pins 14 and 15 of the IO expansion chip U2 are connected to pins 16 and 15 of the control chip U1, respectively.

[0128] The 16 pins of the IO expansion chip U2 are connected to the output of the MCU circuit.

[0129] Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the IO expansion chip U2 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of switch S1, respectively. To ensure the stability of the level, the initial values ​​are pulled up to VCC through 100KΩ resistors R1, R2, R3, R4, R5, R6, R7, and R8, respectively. The read level signal is 1. The other end of switch S1, pins 9, 10, 11, 12, 13, 14, 15, and 16, are all connected to GND. When the DIP switch is turned on, the level signal of this path becomes 0. The IO expansion chip U2 reads 8 level signals to form 256 address values. Pin 5 of the IO expansion chip U2 is connected to GND for normal enable. Pins 9 (A0), 7 (A1), and 6 (A2) of the IO expansion chip U2 are connected to pins 19, 1, and 2 of U1 respectively to form the IIC communication address circuit. Pins 14 (SCL) and 15 (SDA) of the IO expansion chip U2 are connected to pins 16 and 15 of U1 respectively to form the IIC communication data line and clock line. Pin 16 of the IO expansion chip U2 is connected to VCC, and pin 8 is connected to GND to provide operating power.

[0130] Among them, switch S1 is SW DPI_8; the resistance values ​​of resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all 100LΩ.

[0131] In a preferred embodiment, the flow meter type and interface circuit also includes switch S2, IO expansion chip U4, resistor R10, resistor R11, resistor R12, resistor R13, resistor R14, resistor R15, resistor R16 and resistor R17.

[0132] In this preferred embodiment, apart from the different naming conventions of the components, the flow meter type, chip, resistor selection, and circuit connection method are all the same as the flow meter type and interface circuit mentioned above. Together, they form the flow meter type selection circuit, which can achieve unified conversion of 256 flow meter protocols.

[0133] The IO expansion chip U4 uses the TA9555;

[0134] Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the IO expansion chip U4 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the switch S2, respectively. Resistors R10, R11, R12, R13, R14, R15, R16, and R17 are also connected sequentially between the pins of the IO expansion chip U4 and the switch S2.

[0135] The other ends of resistors R10, R11, R12, R13, R14, R15, R16, and R17 are all connected to the output terminal of the MCU circuit.

[0136] Pins 9, 10, 11, 12, 13, 14, 15, and 16 of switch S2 are all grounded;

[0137] Pins 5 and 8 of the IO expansion chip U4 are grounded;

[0138] Pins 9, 7, and 6 of the IO expansion chip U4 are connected to pins 19, 1, and 2 of the control chip U1, respectively.

[0139] Pins 14 and 15 of the IO expansion chip U4 are connected to pins 16 and 15 of the control chip U1, respectively.

[0140] Pin 16 of the IO expansion chip U4 is connected to the output of the MCU circuit.

Claims

1. A device with a unified interface for a gas flow meter and controller, characterized in that, Includes an adapter box (1); the adapter box (1) is provided with an adapter circuit board (2) inside, and the adapter circuit board (2) integrates an adapter circuit; The aforementioned adapter circuit includes a main power supply, an MCU circuit, a controller interface circuit, a flow meter interface circuit, and a flow meter type and address interface circuit. The main power supply is connected to the MCU circuit, controller interface circuit, flow meter interface circuit, flow meter type and address interface circuit respectively; The MCU circuit is also connected to the controller interface circuit, the flow meter interface circuit, and the flow meter type and address interface circuit, respectively. The adapter box (1) is provided with an aviation plug (3) and at least one PG connector (4) on both sides respectively. The controller interface circuit of the adapter circuit board (2) is connected to the controller via the aviation plug (3); The flow meter interface circuit of the adapter circuit board (2) is connected to the flow meter through the PG connector (4).

2. The device with a unified interface for the gas flow meter and controller as described in claim 1, characterized in that, The adapter box is equipped with two PG connectors (4).

3. The device with a unified interface for the gas flow meter and controller as described in claim 2, characterized in that, The main power supply voltage is 12V.

4. The device with a unified interface for the gas flow meter and controller as described in claim 3, characterized in that, The MCU circuit includes a control chip U1 and a voltage regulator circuit; The control chip U1 mentioned above uses HD_003; The voltage regulator circuit includes a downloader interface J1, capacitors C1, C2, C3, C4, and C5, a resistor R9, diodes D1 and D2, and a voltage regulator chip U3. The voltage regulator chip U3 mentioned above is 26210A-36PG; The 8th pin of the control chip U1, one end of capacitor C1 and one end of capacitor C2 are connected together, and the 9th pin of the control chip U1 is connected to one end of capacitor C3; the other ends of capacitor C1, capacitor C2 and capacitor C3 and the 7th pin of the control chip U1 are grounded together. Pin 12 of the control chip U1 is connected to one end of resistor R9, the other end of resistor R9 is connected to the positive terminal of diode D1, and the negative terminal of diode D1 is grounded. Pins 1, 2, 3, 4, and 5 of the downloader interface J1 are connected to pins 9, 7, 17, 18, and 4 of the control chip U1, respectively. The positive terminal of diode D2 is connected to the main power supply as the input terminal of the MCU circuit, and the negative terminal of diode D2 is connected to pin 2 of voltage regulator chip U3 and the positive terminal of capacitor C4. The negative terminal of capacitor C4, pin 1 of voltage regulator chip U3, and the negative terminal of capacitor C5 are all grounded; the positive terminal of capacitor C5, pin 3 of voltage regulator chip U3, and pin 9 of control chip U1 are all connected together. This connection point serves as the output terminal of the MCU circuit and is connected to the controller interface circuit, flow meter interface circuit, flow meter type, and address interface circuit respectively.

5. The device with a unified interface for the gas flow meter and controller as described in claim 4, characterized in that, The controller interface circuit includes interface J2, interface J3, communication chip U5, resistor R18, resistor R19 and resistor R20; The communication chip U5 mentioned above uses the MAX485. Pin 1 of the communication chip U5 is connected to pin 14 of the control chip U1; Pins 2 and 3 of the communication chip U5 are connected to pin 11 of the control chip U1; Pin 4 of the communication chip U5 is connected to pin 13 of the control chip U1; Pin 5 of the aforementioned communication chip U5 is grounded; The 6 pins of the communication chip U5, one end of resistor R19, one end of resistor R20, and the 3 pins of interface J2 are connected together; the other end of resistor R20 is connected to the output terminal of the MCU circuit. The 7th pin of the communication chip U5, the other end of resistor R19, one end of resistor R18, and the 2nd pin of interface J2 are connected together; the other end of resistor R18 is grounded. The 8 pins of the communication chip U5 are connected to the output of the MCU circuit; Pin 1 of interface J2 is grounded, and pin 4 of interface J2 is connected to the positive terminal of diode D2. The pins of interface J3 are connected to the corresponding ports of the controller and then to the corresponding ports of the flow meter.

6. The device with a unified interface for the gas flow meter and controller as described in claim 5, characterized in that, The flow meter interface circuit includes a communication chip U6, resistors R21, R22, and R23, and an interface J4. The communication chip U6 mentioned above uses the MAX485. The aforementioned interface J4 is formed by sequentially assembling three IX3 / 3.5 interfaces; Pin 1 of the communication chip U6 is connected to pin 5 of the control chip U1; Pins 2 and 3 of the communication chip U6 are connected to pin 3 of the control chip U1; The 4th pin of the communication chip U6 is connected to the 6th pin of the control chip U1; Pin 5 of the communication chip U6 is grounded; The 6th pin of the communication chip U6, one end of resistor R22, one end of resistor R23, and the 9th pin of interface J4 are connected together; the other end of resistor R23 is connected to the output terminal of the MCU circuit. The 7th pin of the communication chip U6, one end of resistor R21, and the 8th pin of interface J4 are connected together; the other end of resistor R21 is grounded. The 8 pins of the communication chip U6 are connected to the output terminal of the MCU circuit.

7. The device with a unified interface for the gas flow meter and controller as described in claim 6, characterized in that, The flow meter type and interface circuit include switch S1, IO expansion chip U2, resistors R1, R2, R3, R4, R5, R6, R7 and R8; The aforementioned IO expansion chip U2 uses the TA9555; Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the U2 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the switch S1, respectively. Resistors R1, R2, R3, R4, R5, R6, R7, and R8 are also connected sequentially between the pins of the IO expansion chip U2 and the switch S1. The other ends of resistors R1, R2, R3, R4, R5, R6, R7, and R8 are all connected to the output terminal of the MCU circuit. Pins 9, 10, 11, 12, 13, 14, 15, and 16 of the switch S1 are all grounded; Pins 5 and 8 of the aforementioned IO expansion chip U2 are grounded; Pins 9, 7, and 6 of the IO expansion chip U2 are connected to pins 19, 1, and 2 of the control chip U1, respectively. Pins 14 and 15 of the IO expansion chip U2 are connected to pins 16 and 15 of the control chip U1, respectively. The 16 pins of the IO expansion chip U2 are connected to the output of the MCU circuit.

8. The device with a unified interface for the gas flow meter and controller as described in claim 7, characterized in that, The flow meter type and interface circuit also include switch S2, IO expansion chip U4, resistors R10, R11, R12, R13, R14, R15, R16 and R17. The aforementioned IO expansion chip U4 uses the TA9555; Pins 10, 11, 12, 13, 1, 2, 3, and 4 of the IO expansion chip U4 are connected to pins 1, 2, 3, 4, 5, 6, 7, and 8 of the switch S2, respectively. Resistors R10, R11, R12, R13, R14, R15, R16, and R17 are also connected sequentially between the pins of the IO expansion chip U4 and the switch S2. The other ends of resistors R10, R11, R12, R13, R14, R15, R16, and R17 are all connected to the output terminal of the MCU circuit. Pins 9, 10, 11, 12, 13, 14, 15, and 16 of the switch S2 are all grounded. Pins 5 and 8 of the aforementioned IO expansion chip U4 are grounded; Pins 9, 7, and 6 of the IO expansion chip U4 are connected to pins 19, 1, and 2 of the control chip U1, respectively. Pins 14 and 15 of the IO expansion chip U4 are connected to pins 16 and 15 of the control chip U1, respectively. The 16 pins of the IO expansion chip U4 are connected to the output of the MCU circuit.

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