Fluid flow metering controller and fuel gas metering and safety control system

Abstract

The utility model discloses a fluid flow metering controller and a fuel gas metering and safety control system, and belongs to the technical field of fuel gas application. According to the fluid flow metering control instrument, fluid flow conversion is achieved according to the magnetoelectric conversion principle, displacement changes of the upper permanent magnet and the lower permanent magnet arranged on the flow sensing assembly are sensed through the bipolar linear Hall sensor, analog variable signals are output, and feedback signals are output to the collecting and metering control module for data operation processing. Meanwhile, the temperature sensor and the pressure sensor are used for collecting the temperature and the pressure of the system respectively, collected signals are output to the collecting and metering control module for data operation processing, and flow metering correction, overcurrent protection and safety control are achieved; the fluid flow metering controller can be used for metering the flow of liquid and gas, and is small in overall size, high in metering precision, high in reliability and high in safety.

Description

TECHNICAL FIELD

[0001] The utility model belongs to gas application technical field, concretely relates to a kind of fluid flow measurement control instrument and gas measurement and safety control system. BACKGROUND

[0002] With the continuous development of urbanization, in the face of the rapid growth of the number of city pipeline gas users, gas field is mixed: happy that the scope of operation of gas field has been extended, worry that the gas management of large-scale growth of residential users is very brain-straining. The gas field usually adopts manual meter reading and manual statistics to manage the gas volume of residential users, which is labor-intensive, high in error rate, seriously lags behind in gas fee management, completely offline management, lacks factual data, lacks advanced technical innovation and application of new advanced technology, and has high safety hazards.

[0003] On the other hand, the existing gas meter has single function, large volume and high cost, can only display data, cannot make timely and effective treatment for abnormal conditions such as gas leakage, excessive flow, over-temperature, arrears and system failure, lacks the ability of comprehensive measurement, comprehensive protection and comprehensive control, and the gas meter switch still needs to be controlled manually, which brings many inconveniences and safety hazards to safety production. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the defects of prior art, and provides a kind of fluid flow measurement control instrument and gas measurement and safety control system.

[0005] To achieve the above-mentioned utility model purposes, the application embodiment first provides a kind of fluid flow measurement control instrument, including shell, the bottom of the shell is equipped with fluid inlet, the side of the shell is equipped with fluid outlet, the inside of the shell is equipped with fluid multi-channel cylinder, fluid buffer chamber and flow sensing assembly;The flow sensing assembly can reciprocate linearly along the axis of the fluid multi-channel cylinder;The lower port of the fluid multi-channel cylinder is connected with the fluid inlet;The fluid buffer chamber is composed of the space above the flow sensing assembly and the space outside the fluid multi-channel cylinder;The fluid buffer chamber is connected with the fluid outlet through permanent magnet valve;The inside of the fluid multi-channel cylinder is communicated with the fluid buffer chamber through fluid channel on the side wall thereof;The upper part of the shell has groove body that goes into the fluid buffer chamber, double-pole linear hall sensor is equipped in the groove body, and the double-pole linear hall sensor is located on the axis of the fluid multi-channel cylinder.

[0006] The utility model further limits the technical scheme:

[0007] Preferably, the fluid buffer chamber is equipped with a pressure sensor, and the fluid inlet is equipped with a temperature sensor.

[0008] Preferably, the flow sensing assembly is provided with an upper permanent magnet and a lower permanent magnet, and the upper permanent magnet and the lower permanent magnet are located directly above and directly below the bipolar linear Hall sensor respectively.

[0009] Preferably, the flow sensing assembly comprises a base, a hollow support and a top cover, and the upper permanent magnet and the lower permanent magnet are arranged at the upper portion and the lower portion of the hollow support respectively, and when the flow sensing assembly moves to the lower port of the fluid multi-channel cylinder, the base blocks the communication between the lower port of the fluid multi-channel cylinder and the fluid inlet, and when the flow sensing assembly moves to the upper port of the fluid multi-channel cylinder, the base blocks the communication between the upper port of the fluid multi-channel cylinder and the fluid buffer chamber.

[0010] Preferably, the fluid flow metering control instrument further comprises an acquisition metering control module, and the acquisition metering control module is electrically connected with the bipolar linear Hall sensor, the pressure sensor, the temperature sensor and the permanent magnet valve respectively.

[0011] Preferably, the acquisition metering control module comprises an MCU, an A / D conversion module, a power module, a display module, a key module, a communication module, a radio frequency module, a Bluetooth module, an infrared module, a main valve module, a gas leakage module, a security encryption module, an expansion module and a storage module, and the MCU is electrically connected with the A / D conversion module, the power module, the display module, the key module, the communication module, the radio frequency module, the Bluetooth module, the infrared module, the main valve module, the gas leakage module, the security encryption module, the expansion module and the storage module respectively.

[0012] The application also provides a gas metering and safety control system, which comprises a gas data service platform, a gas pipeline inlet, a gas constant pressure valve, a gas total meter, total meter branches, gas pipeline branches, gas branch total meters, branch total meter branches, gas user branches and gas user submeters; the gas pipeline inlet is connected with the gas total meter through the gas constant pressure valve, the gas total meter is connected with the total meter branches, each total meter branch is provided with a plurality of gas pipeline branches, each gas pipeline branch is provided with a gas branch total meter, each gas branch total meter is connected with a branch total meter branch, each branch total meter branch is provided with a plurality of gas user branches, each gas user branch is provided with a gas user submeter, and each gas user submeter is connected with a plurality of gas appliances of a gas user; the gas total meter, the gas branch total meter and the gas user submeter are wirelessly connected with the gas data service platform; and each of the gas total meter, the gas branch total meter and the gas user submeter adopts the fluid flow metering control instrument.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] The fluid flow metering control instrument of the utility model realizes fluid flow conversion by using magneto-electric conversion principle, utilizes the displacement change of the upper permanent magnet and the lower permanent magnet of the flow induction assembly sensed by the dual-pole linear Hall sensor to output analog variable signal feedback signal to the acquisition metering control module for data operation processing, simultaneously collects system temperature and pressure through the temperature sensor and the pressure sensor respectively, outputs the acquisition signal to the acquisition metering control module for data operation processing, realizes flow metering correction, over-flow protection and safety control.

[0015] The gas metering and safety control system of the utility model adopts the intelligent fluid flow metering control instrument, can automatically shut off the gas circuit to realize gas safety protection when various abnormal conditions such as no flow, over flow, over temperature, over pressure, under pressure and gas leakage occur, simultaneously has the functions of voice, far infrared, timing and delay control of gas pipeline opening and closing, and has high intelligence degree and high safety factor. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic view of the fluid flow metering control instrument of the utility model embodiment;

[0017] Figure 2 It is the fluid multi-channel cylinder structure schematic view of the utility model embodiment;

[0018] Figure 3 It is the flow induction assembly structure schematic view of the utility model embodiment;

[0019] Figure 4 It is the acquisition metering control module structure block diagram of the utility model embodiment;

[0020] Figure 5 It is the gas metering and safety control system structure schematic view of the utility model embodiment. DETAILED DESCRIPTION

[0021] In order to make the utility model technical scheme more easily be clearly understood, the following according to specific embodiment and combining with the drawings, the utility model technical scheme is made further detailed explanation. Obviously, the following embodiment is only a part of the embodiment of the utility model, does not constitute the limitation of the utility model technical scheme. For the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other embodiments according to the embodiment of the present application. Embodiment 1

[0022] As Figure 1The embodiment provides a fluid flow metering control instrument, which comprises a shell 11, a fluid inlet 22 arranged at the bottom of the shell 11, a fluid outlet 23 arranged at one side of the shell 11, a fluid multi-channel cylinder 12, a fluid buffer chamber 24 and a flow sensing assembly 13 arranged in the shell 11, and the flow sensing assembly 13 can move along the axis of the fluid multi-channel cylinder 12 in a reciprocating linear mode.

[0023] The lower port of the fluid multi-channel cylinder 12 is connected with the fluid inlet 22. The fluid buffer chamber 24 is composed of the space above the flow sensing assembly 13 and the space outside the fluid multi-channel cylinder 12, and the fluid buffer chamber 24 is connected with the fluid outlet 23 through a permanent magnet valve 21, as shown in the figure. Figure 2 The sidewall of the fluid multi-channel cylinder 12 is provided with fluid channels 14, through which the inner side of the fluid multi-channel cylinder 12 communicates with the fluid buffer chamber 24 outside the fluid multi-channel cylinder 12.

[0024] The fluid buffer chamber 24 is provided with a pressure sensor 18 for collecting fluid pressure data, and the pressure sensor is mechanically connected to the inner wall of the shell. The fluid inlet 22 is provided with a temperature sensor 19 for collecting fluid temperature data, and the temperature sensor 19 is mechanically connected to the inner wall of the shell.

[0025] The upper part of the shell 11 of the embodiment has a groove body extending into the fluid buffer chamber 24, and the groove body is provided with a bipolar linear Hall sensor 16. The bipolar linear Hall sensor 16 is located on the axis of the fluid multi-channel cylinder 12.

[0026] As shown in the figure, Figure 3 The flow sensing assembly 13 comprises a base 13-1, a hollow support 13-2 and a top cover 13-3. An upper permanent magnet 17 and a lower permanent magnet 15 are arranged at the upper part and the lower part of the hollow support 13-2 respectively, and the bipolar linear Hall sensor 16 is located in the space surrounded by the plurality of supports 13-2. The upper permanent magnet 17 and the lower permanent magnet 15 are located directly above and directly below the bipolar linear Hall sensor 16 respectively, and the upper permanent magnet and the lower permanent magnet cooperate to provide a reliable working magnetic field for the bipolar linear Hall sensor 16.

[0027] When the flow sensing assembly 13 moves to the lower port of the fluid multi-channel cylinder 12, the base 13-1 blocks the communication between the lower port of the fluid multi-channel cylinder 12 and the fluid inlet 22, and when the flow sensing assembly 13 moves to the upper port of the fluid multi-channel cylinder 12, the base 13-1 blocks the communication between the upper port of the fluid multi-channel cylinder 12 and the fluid buffer chamber 24,

[0028] The fluid buffer chamber 24 can reduce the displacement speed of the flow sensing assembly 13, so that accurate metering is realized.

[0029] The fluid flow metering control instrument of the embodiment further comprises a data acquisition and metering control module 20, which is electrically connected with the bipolar linear Hall sensor 16, the pressure sensor 18, the temperature sensor 19 and the permanent magnet valve 21 respectively; the data acquisition and metering control module 20 performs operation and processing on the data collected by the bipolar linear Hall sensor 16, the pressure sensor 18 and the temperature sensor 19, realizes high-precision flow metering, and according to the operation and processing result, sends a control signal to the permanent magnet valve 21 to control the opening or closing of the fluid outlet 23, realizes overpressure, underpressure, overcurrent protection and other safety control, and the permanent magnet valve 21 is in an automatic closing state when the gas user uses gas, gas use stops or an accident occurs when the gas user uses gas.

[0030] When the flow sensing assembly 13 reciprocates along the axis of the fluid multi-channel cylinder 12, the lower permanent magnet 15 and the upper permanent magnet 17 are displaced, resulting in a change in the magnetic field, and the bipolar linear Hall sensor 16 outputs a corresponding analog voltage variable, and the data acquisition and metering control module 20 performs data operation and processing on the analog voltage variable, realizing fluid flow metering. When the fluid flow exceeds the set peak flow threshold, the permanent magnet valve 21 is controlled to timely shut off the fluid outlet 23 for overcurrent protection. The data acquisition and metering control module 20 performs operation and processing on the fluid pressure data collected by the pressure sensor 18, on the one hand, corrects the flow metering error caused by fluid pressure, and on the other hand, compares the actual fluid pressure with the high pressure threshold and the low pressure threshold, and when the system has overpressure or underpressure, the permanent magnet valve 21 is controlled to timely shut off the fluid outlet 23 for overpressure and underpressure protection. The data acquisition and metering control module 20 performs operation and processing on the fluid temperature data collected by the temperature sensor 19, on the one hand, corrects the flow metering error caused by fluid temperature, and on the other hand, compares the actual fluid temperature with the temperature safety threshold, and when the system has overtemperature, the permanent magnet valve 21 is controlled to timely shut off the fluid outlet 23 for overtemperature protection.

[0031] As shown in Figure 4 The data acquisition and metering control module 20 of the embodiment comprises an MCU, an A / D conversion module, a power module, a display module, a key module, a communication module, a radio frequency module, a Bluetooth module, an infrared module, a main valve module, a gas leakage module, a security encryption module, an expansion module and a storage module, and the MCU is electrically connected with the A / D conversion module, the power module, the display module, the key module, the communication module, the radio frequency module, the Bluetooth module, the infrared module, the main valve module, the gas leakage module, the security encryption module, the expansion module and the storage module respectively;

[0032] The MCU is used for data operation processing and provides overall control function of the fluid flow metering control instrument; the A / D conversion module is used for converting analog signals received by the metering control module 20 into digital signals for operation processing of the MCU; the power module is used for providing power supply for the whole fluid flow metering control instrument; the display module is used for providing display function of the fluid flow metering control instrument, including display of cumulative flow metering value, real-time flow metering value and the like, the flow metering value displayed by the display module is accurate metering value after temperature and pressure compensation correction; the key module is used for providing operation key function, such as on-off key and reset key of the fluid flow metering control instrument; the communication module is used for providing communication function of the fluid flow metering control instrument and other devices, including wired communication and wireless communication; the radio frequency module and the Bluetooth module are used for providing radio frequency communication function and Bluetooth communication function of the fluid flow metering control instrument and other devices; the main valve module is connected with the permanent magnet valve 21 through signals and controls the permanent magnet valve 21 to open or close the fluid outlet 23; the gas leakage module is connected with a gas leakage sensor installed on the gas appliance through signals; if gas leakage occurs during normal gas use of a gas user, the gas leakage sensor transmits information to the gas leakage module, and then the gas leakage module transmits the gas leakage information to the MCU, and the MCU timely sends off instruction to close the permanent magnet valve 11 to close the gas source by the main valve module; the expansion module is used for function expansion; the storage module is used for providing data storage function of the fluid flow metering control instrument.

[0033] The metering control module 20 of the embodiment integrates diagnosis function, operation function, control function, storage function, communication function, decoding and encoding function, security encryption function, display function, safety protection function (including over-current protection, over-voltage protection, under-voltage protection, over-temperature protection, gas leakage protection and the like), multiple mode opening and closing function (including automatic opening and closing, manual opening and closing, delay opening and closing, infrared remote control opening and closing and the like), not only flexible operation, but also effective guarantee of metering safety and safety of the whole gas system.

[0034] The metering control module 20 of the embodiment can be independent of the shell 11, mechanically connected to the shell 11, or integrated with the shell 11.

[0035] The working method of the fluid flow metering controller of the embodiment is as follows: when the permanent magnet valve 21 is opened, fluid enters the fluid multi-channel cylinder 12 through the fluid inlet 22, the fluid channel 14 of the fluid multi-channel cylinder 12 is connected with the fluid outlet 23 because the lower end of the fluid multi-channel cylinder 12 is connected with the fluid inlet 22, when the fluid flows out of the fluid outlet 23, the pressure of the fluid inlet 22 is greater than that of the fluid outlet 23, at this time, the flow sensing assembly 13 installed in the fluid multi-channel cylinder 12 moves upward because the pressure at the bottom end is higher than that at the top end, the lower permanent magnet 15 and the upper permanent magnet 17 installed on the flow sensing assembly 13 also move upward, the upper permanent magnet 17 moves away from the bipolar linear Hall sensor 16, the lower permanent magnet 15 approaches the bipolar linear Hall sensor 16, the magnetic field intensity applied to the bipolar linear Hall sensor 16 changes, so that the bipolar linear Hall sensor 16 outputs a high-level analog variable. The voltage analog variable is sent to the acquisition metering control module 20, after analog-digital conversion by the A / D conversion module, it is sent to the MCU for data operation, and the operation result is stored, displayed and uploaded.

[0036] When the flow of the fluid is constant, the flow sensing assembly 13 is in a static state. The magnetic field intensity applied to the bipolar linear Hall sensor 16 is constant, and the analog variable with a constant potential is output.

[0037] When the flow of the fluid entering through the fluid inlet 22 is reduced or the permanent magnet valve 21 is closed, the flow of the fluid channel 14 of the fluid multi-channel cylinder 12 is reduced, so that the pressure of the fluid inlet 22 and that of the fluid outlet 23 tend to be reduced or balanced, at this time, the flow sensing assembly 13 moves downward due to the action of its own gravity, the fluid flows out of the fluid channel 14, the lower permanent magnet 15 and the upper permanent magnet 17 installed on the flow sensing assembly 13 also move downward, the upper permanent magnet 17 approaches the bipolar linear Hall sensor 16, and the lower permanent magnet 15 moves away from the bipolar linear Hall sensor 16, the magnetic field intensity applied to the bipolar linear Hall sensor 16 changes, so that the high-level analog variable output by the bipolar linear Hall sensor 16 gradually changes into a low-level analog variable, the analog variable is sent to the acquisition metering control module 20, after analog-digital conversion by the A / D conversion module, it is sent to the MCU for data operation, and the operation result is stored, displayed and uploaded.

[0038] The acquisition metering control module 20 receives the voltage analog variable sent by the bipolar linear Hall sensor 16 at different time nodes, and the acquisition data sent by the pressure sensor 18 and the temperature sensor 19, performs data operation processing, realizes flow metering, over-current protection and safety control.

[0039] The fluid flow metering controller of the embodiment does not need an external correction device for temperature and pressure compensation, has small overall volume, high metering accuracy and strong reliability, ensures metering safety, and can realize comprehensive and effective safety control. Example 2

[0040] This embodiment provides a gas metering and safety control system, such as Figure 5 As shown, the system includes: a gas data service platform 1, a gas pipeline inlet 2, a gas constant pressure valve 3, a gas main meter 4, main meter branches 5, gas pipeline branches 6, gas branch main meters 7, branch main meters 8, gas user branches 9, and gas user sub-meters 10. The gas pipeline inlet 2 is connected to the gas main meter 4 via the gas constant pressure valve 3. The gas main meter 4 is connected to the main meter branch 5. The main meter branch 5 has multiple gas pipeline branches 6, each gas pipeline branch 6 has a gas branch main meter 7, each gas branch main meter 7 is connected to a branch main meter branch 8, each branch main meter branch 8 has multiple gas user branches 9, each gas user branch 9 has a gas user sub-meter 10, and each gas user sub-meter 10 is connected to multiple gas appliances of a gas user. The gas main meter 4, gas branch main meters 7, and gas user sub-meters 10 are all wirelessly connected to the gas data service platform 1.

[0041] In this embodiment, the main gas meter 4, branch gas meter 7, and user gas meter 10 all use the fluid flow metering controller from Embodiment 1. Different peak flow thresholds are set for the main gas meter 4, branch gas meter 6, and user gas meter 8. When the actual flow rate measured per unit time by the main gas meter 4, branch gas meter 6, or user gas meter 8 exceeds the corresponding peak flow threshold, the corresponding fluid flow metering controller activates its automatic shut-off function to achieve overcurrent protection and transmits the data to the gas data service platform 1 for recording. When a branch pipeline experiences a pipe breakage or severe gas leakage, the actual measurement value of the fluid flow metering controller on that branch pipeline will exceed its peak flow threshold. In this case, the fluid flow metering controller on that branch pipeline activates its automatic shut-off function, without affecting the normal gas supply to the main pipeline.

[0042] The gas data service platform 1 manages all gas main meters 4, gas branch main meters 7, and gas user sub-meters 10 using a unique meter-code system. Based on the flow rate measurements uploaded by the gas main meters 4, gas branch main meters 6, and gas user sub-meters 8 within a unit of time, the platform calculates whether there is a gas leak in the pipeline, determines the location of the leak, and issues a command to shut down the fluid flow metering controller at the inlet of the leaking pipeline. When the measurement value of the gas main meter 4 equals the sum of the measurement values ​​of all gas branch main meters 7 connected to it, and the measurement value of each gas branch main meter 7 equals the sum of the measurement values ​​of all gas user sub-meters 10 connected to it, it indicates that there is no gas leak in the pipeline. If there are discrepancies, it indicates a leak in the section of the pipeline from the gas main meter to the gas user sub-meters.

[0043] The gas pipeline total meter and the gas pipeline branch meter are respectively set with different peak flow threshold values, when the gas branch pipeline appears pipeline rupture or serious gas leakage, the actual measurement value of the gas branch pipeline branch meter will exceed the peak flow threshold value of the gas branch pipeline branch meter, at this time, the gas branch pipeline branch meter will be closed, without affecting the normal gas supply of the gas main pipeline. No matter the total meter or the branch meter, a separate peak flow threshold value is set, when the actual measurement data of the gas pipeline total meter and the gas pipeline branch meter within a unit time exceeds the set peak flow threshold value, the gas meter will be automatically closed, and the data is transmitted to the gas data service platform for recording.

[0044] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present application, in addition to the above-mentioned embodiments, the present application can also have other implementation manners; any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present application.

Claims

1. A fluid flow metering control device comprising a housing (11), characterised in that, The bottom of the shell (11) is provided with a fluid inlet (22), the side of the shell (11) is provided with a fluid outlet (23), and the inside of the shell (11) is provided with a fluid multi-channel cylinder (12), a fluid buffer chamber (24) and a flow sensing assembly (13); the flow sensing assembly (13) can make reciprocating linear motion along the axis of the fluid multi-channel cylinder (12); the lower port of the fluid multi-channel cylinder (12) is connected with the fluid inlet (22); the fluid buffer chamber (24) is composed of the space above the flow sensing assembly (13) and the space outside the fluid multi-channel cylinder (12); the fluid buffer chamber (24) is connected with the fluid outlet (23) through a permanent magnet valve (21); the inside of the fluid multi-channel cylinder (12) is communicated with the fluid buffer chamber (24) through the fluid channel (14) on the side wall thereof; The upper part of the shell (11) has a groove body extending into the fluid buffer chamber (24), and a bipolar linear Hall sensor (16) is arranged in the groove body, and the bipolar linear Hall sensor (16) is located on the axis of the fluid multi-channel cylinder (12).

2. The fluid flow metering control of claim 1, wherein, A pressure sensor (18) is arranged in the fluid buffer chamber (24), and a temperature sensor (19) is arranged in the fluid inlet (22).

3. The fluid flow metering control of claim 1 wherein, An upper permanent magnet (17) and a lower permanent magnet (15) are arranged on the flow sensing assembly (13), and the upper permanent magnet (17) and the lower permanent magnet (15) are located directly above and directly below the bipolar linear Hall sensor (16) respectively.

4. The fluid flow metering control of claim 3 wherein, The flow sensing assembly (13) comprises a base (13-1), a hollow support (13-2) and a top cover (13-3), the upper permanent magnet (17) and the lower permanent magnet (15) are arranged on the upper part and the lower part of the hollow support (13-2) respectively, when the flow sensing assembly (13) moves to the lower port of the fluid multi-channel cylinder (12), the base (13-1) blocks the communication between the lower port of the fluid multi-channel cylinder (12) and the fluid inlet (22), when the flow sensing assembly (13) moves to the upper port of the fluid multi-channel cylinder (12), the base (13-1) blocks the communication between the upper port of the fluid multi-channel cylinder (12) and the fluid buffer chamber (24).

5. The fluid flow metering control of claim 2 wherein, The fluid flow metering control instrument further comprises an acquisition metering control module (20), and the acquisition metering control module (20) is electrically connected with the bipolar linear Hall sensor (16), the pressure sensor (18), the temperature sensor (19) and the permanent magnet valve (21) respectively.

6. The fluid flow metering control of claim 5 wherein, The collection metering control module (20) comprises an MCU, an A / D conversion module, a power module, a display module, a key module, a communication module, a radio frequency module, a Bluetooth module, an infrared module, a main valve module, a gas leakage module, a security encryption module, an expansion module and a storage module, and the MCU is electrically connected with the A / D conversion module, the power module, the display module, the key module, the communication module, the radio frequency module, the Bluetooth module, the infrared module, the main valve module, the gas leakage module, the security encryption module, the expansion module and the storage module.

7. A gas metering and safety control system characterized by, It comprises: A gas data service platform (1), a gas pipeline inlet (2), a gas constant pressure valve (3), a gas total meter (4), a total meter branch (5), a gas pipeline branch (6), a gas branch total meter (7), a branch total meter branch (8), a gas user branch (9) and a gas user sub-meter (10); the gas pipeline inlet (2) is connected with the gas total meter (4) through the gas constant pressure valve (3), the gas total meter (4) is connected with the total meter branch (5), a plurality of gas pipeline branches (6) are arranged on each total meter branch (5), one gas branch total meter (7) is arranged on each gas pipeline branch (6), each gas branch total meter (7) is connected with a branch total meter branch (8), a plurality of gas user branches (9) are arranged on each branch total meter branch (8), one gas user sub-meter (10) is arranged on each gas user branch (9), and each gas user sub-meter (10) is connected with a plurality of gas appliances of a gas user; the gas total meter (4), the gas branch total meter (7) and the gas user sub-meter (10) are all wirelessly connected with the gas data service platform (1); wherein the gas total meter (4), the gas branch total meter (7) and the gas user sub-meter (10) all adopt the fluid flow metering control instrument according to any one of claims 1-6.

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