A multifunctional intelligent industrial and commercial membrane meter running meter device and a gas leakage detection method

Abstract

The present invention proposes a multifunctional intelligent industrial and commercial membrane meter running meter device and a gas leakage detection method, which belongs to the technical field of gas meters. The device includes a fan and a multi-stage pipeline. The multi-stage pipeline is formed by connecting at least two stages of pipelines, namely a main pipeline and a branch pipeline. One end of the main pipeline is connected to the air inlet of the fan. The main pipeline is provided with an air intake total flow meter, and a total flow regulating valve is provided next to the air intake total flow meter; the branch pipeline is composed of a plurality of branch pipelines, each branch pipeline is matched with a gas meter, and a single-position flow meter and a single-position flow regulating valve are provided on the branch pipeline, and a quick-release joint is provided at the end thereof. A flexible joint is provided on the gas outlet on the gas meter, which is connected to the quick-release joint through a hose. The present invention adopts a negative pressure fan suction method, and at the same time adopts a flexible joint that can be adapted to different specifications, which is used to verify the electromechanical conversion error of industrial and commercial membrane meters of different specifications, and is particularly suitable for simultaneous gas leakage tests of multiple industrial and commercial membrane meters of the same specification.

Description

Technical Field

[0001] The present invention relates to the technical field of gas meters, and in particular to a multifunctional intelligent industrial and commercial membrane meter running meter device and a gas leakage detection method. Background Art

[0002] With the acceleration of urbanization and the rapid development of industry and commerce, the supply and use of gas as an important energy source has increased year by year. As an important measurement tool for pipeline gas trade settlement, the measurement accuracy and reliability of gas meters play a vital role in ensuring trade fairness and maintaining social harmony.

[0003] At present, the intelligent industrial and commercial diaphragm meters widely used in the market have become the first choice in the field of gas supply due to their high precision and high reliability. However, such meters need to undergo strict testing and calibration before leaving the factory to ensure that their measurement accuracy and reliability meet the requirements of use. Among them, indication error, pressure loss detection and electromechanical conversion error test are three important inspection items. Indication error and pressure loss detection mainly verify the metering accuracy and pressure loss of the meter, while the electromechanical conversion error test verifies the consistency between the mechanical reading and the electronic reading. For industrial and commercial diaphragm meters, due to their large gas demand and high gas costs, the accuracy of the electromechanical conversion error is directly related to the economic interests of users and the economic benefits of gas supply companies.

[0004] However, in the existing testing technology, verifying whether the electromechanical conversion is consistent mainly relies on manual operation, using a blower to blow air on each meter, and then manually connecting the air pipe to the next meter for testing when it is qualified. This method has obvious disadvantages: first, the production efficiency is low, and manual handling and connecting the air pipe is time-consuming and labor-intensive; second, due to the uncontrollability of manual operation, it is easy to introduce human errors, affecting the accuracy of the test results.

[0005] In view of the above problems, the present invention proposes a novel intelligent industrial and commercial membrane meter electromechanical conversion error detection device and method, aiming to improve detection efficiency, reduce human errors, and ensure the measurement accuracy and reliability of the gas meter. Summary of the invention

[0006] The object of the present invention is to provide a multifunctional intelligent industrial and commercial membrane watch device to solve the above-mentioned problems of the prior art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multifunctional intelligent industrial and commercial membrane meter device includes a fan, a multi-stage pipeline and multiple gas meters. The multi-stage pipeline is in a tree-like structure diagram. The multi-stage pipeline includes a main pipeline and branch pipelines. One end of the main pipeline is connected to the air inlet of the fan, and the main pipeline is provided with an air intake total flow meter; the branch pipeline is composed of multiple branch pipelines, each of the branch pipelines is matched with one gas meter, and a single-station flow meter is provided on the branch pipeline. A quick-release joint is provided at the end of the branch pipeline, and the air outlet on the gas meter is connected to the quick-release joint through a connector.

[0009] As a preferred technical solution of the present invention, a total flow regulating valve is provided next to the total air intake flow meter, and a single-station flow regulating valve is also provided on the branch pipeline.

[0010] As a preferred technical solution of the present invention, the multi-stage pipeline also includes a transition pipeline, the main pipeline is connected to the branch pipeline through the transition pipeline to form a three-stage pipeline, and a flow regulating sub-valve is also provided on the transition pipeline.

[0011] Furthermore, the multi-stage pipelines all use PVC pipes, the diameters of the main pipeline and the transition pipeline are both 80 mm, and the diameters of each branch pipeline of the branch pipeline are all 60 mm.

[0012] As a preferred technical solution of the present invention, the fan is a negative pressure fan, and a gas leakage test is performed on the gas meter by using a suction method.

[0013] As a preferred technical solution of the present invention, a flexible joint is provided on the gas outlet of the gas meter, and the connecting piece is a hose. The flexible joint of the gas meter is connected to the quick-release joint via the hose.

[0014] Furthermore, the flexible joint is trumpet-shaped and adaptably connected to one end of the hose, and has multiple steps to adapt to hoses of different diameters.

[0015] The method for detecting gas leakage of the multifunctional intelligent industrial and commercial membrane meter device of the present invention comprises the following steps:

[0016] S100 power source start: The power source is a fan, which works in a negative pressure mode. Press the fan start and stop button on the workbench;

[0017] S200 determines the output flow of the fan before gas leakage: a single gas meter under inspection obtains a single design flow Q according to its specifications 0 According to the number of branch pipelines, the maximum number of gas meters to be inspected is n, and the total design flow rate Q of the branch pipelines is calculated. 1 =nQ 0 , adjust the fan output flow Q through the total flow control valve 2, adjust the fan output flow and the total design flow of the branch pipeline to meet the relationship Q 2 = k × Q 1 , where k is the amplification factor, ranging from 1.1 to 1.2;

[0018] S300 assembles several gas meters to be inspected at different workstations: determine the number of gas meters to be inspected, insert trumpet-shaped flexible joints into the gas outlets of each gas meter to be inspected, connect them with each branch pipeline through a hose, and complete the assembly of the gas meters to be inspected on the workbench;

[0019] S400 stop meter: After starting the fan, the stop meter test begins. When the electromechanical conversion error of the gas meter under test meets the design requirements, it is qualified to flow out;

[0020] When the electromechanical conversion error of the gas meter under inspection exceeds the design requirements of the specifications, the meter test shall be continued after repair until the design requirements of the specifications are met.

[0021] Furthermore, the fan output flow in step S200 is controlled according to the accuracy of the electromechanical conversion error. The working conditions of the gas leakage test can be determined according to the accuracy requirements of the electromechanical conversion error, including the fan output flow, the diameter and material of the branch pipeline, the ambient temperature and humidity. The accuracy requirements of the electromechanical conversion error are controlled by the conversion accuracy and meet the following formula:

[0022] Q 2 = k × Q 1

[0023]

[0024] Where, δ is the conversion accuracy, Q 1 is the maximum total flow of the meter under inspection, Q 2 is the fan output flow, k is the amplification factor, λ 1 , 2 , 3 , 4 is the adjustment coefficient, R is the inner diameter of the branch pipeline, μ is the friction coefficient of the inner surface of the pipeline, T is the ambient temperature, and H is the ambient relative humidity.

[0025] The beneficial effects of the present invention are:

[0026] 1. The device of the present invention adopts a negative pressure fan to suck air simultaneously instead of the traditional blower blowing one by one. This design is used to verify the electromechanical conversion error of industrial and commercial membrane meters of different specifications to ensure the accuracy and reliability of the meter. The trumpet-shaped flexible joint that can adapt to the air outlet of industrial and commercial membrane meters of different specifications is adopted, allowing multiple industrial and commercial membrane meters of the same specification to be tested for air leakage at the same time, which significantly improves the production detection efficiency.

[0027] 2. Each branch pipeline is matched with a separate single-station flow meter and a single-station flow regulating valve to provide real-time flow data for each branch for easy monitoring and analysis. When an industrial or commercial membrane meter fails, since each branch is independent, the fault location can be quickly determined, which facilitates rapid response. It allows the problematic part to be repaired or replaced without stopping the fan or closing the single-station flow regulating valves of other branch pipelines. By adjusting the single-station flow regulating valves according to changes in production needs, the flow of each branch pipeline can be flexibly adjusted to adapt to different production conditions.

[0028] 3. The device of the present invention adopts modular design, and the multi-step flexible joints can adapt to the production needs of different scales. According to the number and specifications of the tested instruments, the appropriate number of branch pipes is increased and the flexible joints of corresponding specifications are selected for quick splicing and disassembly to achieve flexible production; a large flow fan is selected as the power source to ensure stability and efficiency during the test; the flow rate during the test is accurately controlled by an external flow regulating valve and flow meter, further improving the accuracy of the test;

[0029] 4. Multi-stage pipeline design uses large-diameter PVC pipes as the delivery pipeline. Due to its light weight and smooth inner wall, it can reduce the pressure loss and flow loss of the overall device and improve the reliability of the overall device; the multi-segment quick splicing and disassembly design of the pipeline improves the flexibility of equipment use and the convenience of maintenance.

[0030] 5. By establishing the relationship between conversion accuracy and fan output flow, the magnification factor of the maximum total flow of the meter under test under the best conversion accuracy can be determined, and the best fan output flow can be obtained. Through the precise relationship, the best flow conditions required for gas meter testing can be determined, ensuring the accuracy and repeatability of the test results, improving the measurement reliability of the gas meter, and contributing to the development of new products and the improvement of existing products.

[0031] Through the above design, the present invention not only improves the accuracy and efficiency of detection, but also meets the demand for fast, efficient and flexible detection equipment in modern industrial production through its modularity and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the multifunctional intelligent industrial and commercial membrane watch device of the present invention;

[0033] Figure 2 This is a flow chart of the gas leakage detection method of the present invention;

[0034] Figure 3 is a curve diagram of conversion accuracy and amplification factor k of this specific embodiment;

[0035] In the figure, 1-fan, 2-total air intake flow meter, 3-total flow regulating valve, 4-flow regulating sub-valve, 5-single-station flow regulating valve, 6-single-station flow meter, 7-quick joint, 8-hose, 9-flexible joint, 10-gas meter, 11-fan start and close button, 12-workbench, 13-main pipeline, 14-transition pipeline, 15-sub-pipeline, 150-branch pipeline. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0037] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also have other implementations and variations thereof. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0038] like Figure 1 to Figure 2 As shown, a multifunctional intelligent industrial and commercial membrane meter device includes a fan 1, a multi-stage pipeline and a plurality of gas meters 10. The multi-stage pipeline is in a tree-like structure diagram. The multi-stage pipeline includes a main pipeline 13 and a branch pipeline 15. One end of the main pipeline 13 is connected to the air inlet of the fan 1. The main pipeline 13 is provided with an air intake total flow meter 2; the branch pipeline 15 is composed of a plurality of branch pipelines 150, each branch pipeline 150 is matched with a gas meter 10, a single-station flow meter 6 is provided on the branch pipeline 150, and a quick-release joint 7 is provided at the end of the branch pipeline 150. The air outlet on the gas meter 10 is connected to the quick-release joint 7 through a connector.

[0039] As a preferred technical solution of the present invention, a total flow regulating valve 3 is provided next to the intake total flow meter 2 , and a single-station flow regulating valve 5 is also provided on the branch pipeline 150 .

[0040] The use of the total flow regulating valve 3 and the single-station flow regulating valve 5 allows the operator to flexibly adjust the flow according to different test requirements, thereby improving the adaptability and flexibility of the test. The single-station flow meter 6 and regulating valve on each branch pipeline 150 allow each gas meter 10 to be independently controlled and adjusted to adapt to different test conditions. The tree-like multi-stage pipeline design allows multiple gas meters 10 to be tested at the same time, thereby improving test efficiency and saving time and resources.

[0041] As a preferred technical solution of the present invention, the multi-stage pipeline also includes a transition pipeline 14, and the main pipeline 13 is connected to the branch pipeline 15 through the transition pipeline 14 to form a three-stage pipeline. The transition pipeline 14 is also provided with a flow regulating sub-valve 4.

[0042] The design of the branch pipeline 150 is similar to a modular structure, and the number of gas meters 10 to be tested can be increased or decreased as needed, thereby improving the scalability of the system.

[0043] Furthermore, the multi-stage pipelines all use PVC pipes, the diameters of the main pipeline 13 and the transition pipeline 14 are both 80 mm, and the diameters of the branch pipelines 150 of the branch pipeline 15 are all 60 mm.

[0044] Choose large-diameter PVC pipes for pipelines. They are light in weight and have smooth inner walls, which help reduce pressure loss and flow loss and ensure that the system has sufficient flow supply. Secondly, PVC pipes have good thermal insulation properties, which help reduce heat energy loss, especially when transporting gas.

[0045] As a preferred technical solution of the present invention, the fan 1 is a negative pressure fan 1, and a gas leakage test is performed on the gas meter 10 by using a suction method.

[0046] Compared with the airflow of the blowing method, the airflow of the suction method is more stable and uniform, which helps to reduce the noise caused by airflow turbulence, reduce the acoustic interference to the test equipment and instruments, help improve the concentration and efficiency of the staff, reduce the distraction and fatigue caused by noise, and improve the working environment. In actual use, the gas meter 10 works in an environment below atmospheric pressure. The negative pressure test is closer to the real working state, more accurately simulates the working environment of the gas meter 10 under normal use conditions, and improves the accuracy of the test results.

[0047] As a preferred technical solution of the present invention, a flexible joint 9 is provided on the gas outlet of the gas meter 10 , and the connecting piece is a hose 8 . The flexible joint 9 of the gas meter 10 is connected to the quick-release joint 7 via the hose 8 .

[0048] Furthermore, the flexible joint 9 is trumpet-shaped and adaptably connected to one end of the hose 8 , and has multiple steps to adapt to hoses 8 of different diameters.

[0049] The flared flexible joint 9 helps to form a tight seal, reducing the risk of gas leakage and ensuring the safety and accuracy of the testing process. The stepped adapter allows for quick adjustment and connection of hoses of different sizes 8, reducing the need for additional connectors, reducing system complexity and potential failure points.

[0050] The method for detecting gas leakage of the multifunctional intelligent industrial and commercial membrane meter device of the present invention comprises the following steps:

[0051] S100 Power source start: The power source is the fan 1, which works in a negative pressure mode. Press the fan start and stop button 11 on the workbench 12;

[0052] S200 determines the output flow of the fan 1 before the gas leak: the single gas meter 10 to be inspected obtains the single design flow Q according to its specifications 0 According to the number of branch pipelines 150, the maximum number of gas meters 10 to be inspected is n, and the total design flow rate Q of branch pipelines 15 is calculated. 1 =nQ 0 , adjust the output flow Q of fan 1 through the total flow control valve 3 2 , adjust the output flow of fan 1 and the total design flow of branch pipe 15 to meet the relationship Q 2 = k × Q 1 , where k is the amplification factor, ranging from 1.1 to 1.2;

[0053] The flow amplification factor k is introduced to ensure the accuracy and comprehensiveness of the gas leakage test. The amplification factor compensates for the flow loss and pressure drop that may occur between the gas power source and the test point, such as the friction resistance of the pipeline, the opening degree of the valve, etc., to ensure that the gas meter 10 can receive sufficient flow during the test, thereby simulating the operating state under actual use conditions and more accurately evaluating the performance of the gas meter 10 under different flow conditions, including its metering accuracy and response speed.

[0054] S300: Assembling the gas meters 10 to be inspected of a certain number of workstations: determining the number of the gas meters 10 to be inspected, inserting the trumpet-shaped flexible joint 9 into the gas outlet of each gas meter 10 to be inspected, connecting with each branch pipeline 150 through the hose 8, and completing the assembly of the gas meters 10 to be inspected on the workbench 12;

[0055] S400 stopwatch: After starting the fan 1, the stopwatch test begins. When the electromechanical conversion error of the gas meter 10 under test meets the design requirements of the specification, it is qualified to flow out;

[0056] When the electromechanical conversion error of the gas meter 10 under inspection exceeds the standard design requirements, the meter test is continued after repair until the standard design requirements are met.

[0057] In this embodiment, gas leakage detection is performed on ten diaphragm gas meters 10 of specification QK2000G6. According to production requirements, the electromechanical conversion error of the diaphragm gas meter 10 should be less than or equal to one pulse equivalent.

[0058] Furthermore, in step S200, the output flow of the fan 1 is controlled according to the accuracy of the electromechanical conversion error. According to the accuracy requirement of the electromechanical conversion error, the working conditions of the air leakage test can be determined, including the output flow of the fan 1, the diameter and material of the branch pipe 150, the ambient temperature and humidity. The accuracy requirement of the electromechanical conversion error is controlled by the conversion accuracy, and satisfies the following formula:

[0059] Q 2 = k × Q 1

[0060]

[0061] In the formula, δ is the conversion accuracy, Q 1 is the maximum total flow of the meter under inspection, Q 2 is the output flow of fan 1, k is the amplification factor, λ 1 , 2 , 3 , 4 is the adjustment coefficient, R is the inner diameter of the branch pipeline 150, μ is the friction coefficient of the inner surface of the pipeline, T is the ambient temperature, and H is the ambient relative humidity.

[0062] like Figure 3 As shown, according to the calibration requirements, in order to ensure the measurement accuracy of the gas meter, it is necessary to calibrate under certain environmental conditions. The ambient temperature affects the density of the gas, and the ambient humidity affects the flow characteristics of the gas. Strict control of the calibration environmental conditions can ensure the performance stability of the gas meter during the calibration process, reduce the impact of environmental factors on the calibration results, and improve the consistency and reliability of the calibration. The calibration environment standard conditions are: the ambient temperature should be (20±2)℃, and the ambient relative humidity is 35%~85%. In the actual production process, due to different regions and seasons, the ambient temperature and humidity are controlled by air-conditioning systems and dehumidifiers or humidifiers. Temperature and humidity sensors are installed to monitor the indoor temperature and humidity conditions in real time to keep the environmental conditions meeting the requirements of the calibration environment. In this specific embodiment, a DN80 PVC pipe is used as the main pipeline 13 and the transition pipeline 14, and a DN60 PVC pipe is used as the branch pipeline 150. The friction coefficient of the inner surface of the pipeline is 0.01. The calibration environment conditions are set to an ambient temperature of 20°C and an ambient relative humidity of 65%. The corresponding conversion accuracy data can be obtained by adjusting the amplification coefficient k of the power source. The relationship between the conversion accuracy and the amplification coefficient k is obtained according to data fitting, where the adjustment coefficient λ 1 , 2 , 3 , 4 The values ​​are 98.9, 0.232, 739.6, and 1.16 respectively;

[0063]

[0064] In order to ensure the accuracy of the electromechanical conversion error of the gas meter 10, for the first and subsequent calibrations, the conversion accuracy should be controlled at more than 99%. Combining the above relationship, it can be obtained that the amplification factor k should be controlled at 1.1-1.2, that is, the output flow of the power source specified in the calibration method should be 1.1-1.2 times the maximum total flow of the meter being tested. Since the curve model of the conversion accuracy with respect to the amplification factor k is Gaussian distribution GaussAmp, according to the attached Figure 3It can be calculated that the amplification factor k corresponding to the best conversion accuracy is 1.16. In order to achieve the highest calibration accuracy of 99.9%, we should set the amplification factor to 1.16. This can minimize the electromechanical conversion error of the gas meter 10 during the calibration process, while ensuring that the conversion accuracy reaches or exceeds the requirement of 99%, which helps to improve the accuracy and reliability of the gas meter 10 and meet strict calibration standards.

[0065] It should be understood that the above-mentioned embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations thereof based on the present invention; the variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations all fall within the scope of protection of the present invention.

Claims

1. A method for detecting gas leakage in a multifunctional intelligent industrial and commercial membrane meter device, characterized in that: The following steps are involved: S100 power source start: The power source is a fan, which works in a negative pressure mode. Press the fan start and stop button on the workbench; The running meter device includes the fan, a multi-stage pipeline and a plurality of gas meters. The multi-stage pipeline is in a tree-like structure diagram. The multi-stage pipeline includes a main pipeline and a branch pipeline. One end of the main pipeline is connected to the air inlet of the fan. The main pipeline is provided with an air intake total flow meter. The branch pipeline is composed of a plurality of branch pipelines. Each branch pipeline is matched with a gas meter. A single-station flow meter is provided on the branch pipeline. A quick-release joint is provided at the end of the branch pipeline. The air outlet on the gas meter is connected to the quick-release joint through a connector. A total flow regulating valve is provided next to the air intake total flow meter. A single-station flow regulating valve is also provided on the branch pipeline. S200 determines the output flow of the fan before gas leakage: a single gas meter under inspection obtains a single design flow Q0 according to its specifications, and the maximum number of gas meters under inspection is n according to the number of branch pipelines. The total design flow of the branch pipelines is calculated to be Q1 = nQ0, and the output flow of the fan Q2 is adjusted by the total flow control valve until the output flow of the fan and the total design flow of the branch pipelines meet the relationship Q2 = k × Q1, where k is the amplification factor, which is 1.1 to 1.2; The fan output flow is controlled based on the accuracy of the electromechanical conversion error. The working conditions of the air leakage test can be determined according to the accuracy requirements of the electromechanical conversion error, including the fan output flow, the diameter and material of the branch pipeline, the ambient temperature and humidity. The accuracy requirements of the electromechanical conversion error are controlled by the conversion accuracy and meet the following formula: Q2=k×Q1 In the formula, δ is the conversion accuracy, Q1 is the maximum total flow of the meter under test, Q2 is the fan output flow, k is the amplification factor, λ1, λ2, λ3, λ4 are adjustment factors, R is the inner diameter of the branch pipeline, μ is the friction coefficient of the inner surface of the pipeline, T is the ambient temperature, and H is the ambient relative humidity; S300 assembles several gas meters to be inspected at different workstations: Determine the number of gas meters to be inspected, connect the gas outlets of each gas meter to each branch pipeline, and complete the assembly of the gas meters to be inspected on the workbench; S400 stop meter: After starting the fan, the stop meter test begins. When the electromechanical conversion error of the gas meter under test meets the design requirements, it is qualified to flow out; When the electromechanical conversion error of the gas meter under inspection exceeds the design requirements of the specifications, the meter test shall be continued after repair until the design requirements of the specifications are met.

2. The method for detecting gas leakage of a multifunctional intelligent industrial and commercial membrane meter device according to claim 1, characterized in that: The multi-stage pipeline also includes a transition pipeline, through which the main pipeline is connected to the branch pipeline to form a three-stage pipeline, and a flow regulating sub-valve is also provided on the transition pipeline.

3. The method for detecting gas leakage of a multifunctional intelligent industrial and commercial membrane meter device according to claim 2, characterized in that: The multi-stage pipelines are all made of PVC pipes, the diameters of the main pipeline and the transition pipeline are both 80 mm, and the diameters of the branch pipelines of the branch pipelines are all 60 mm.

4. The method for detecting gas leakage of a multifunctional intelligent industrial and commercial membrane meter device according to claim 1, characterized in that: The fan is a negative pressure fan, which uses suction mode to perform gas leakage test on the gas meter.

5. The method for detecting gas leakage of a multifunctional intelligent industrial and commercial membrane meter device according to claim 1, characterized in that: A flexible joint is provided on the gas outlet of the gas meter, and the connecting piece is a hose. The flexible joint of the gas meter is connected to the quick-release joint via the hose.

6. The method for detecting gas leakage of a multifunctional intelligent industrial and commercial membrane meter device according to claim 5, characterized in that: The flexible joint is trumpet-shaped and is adaptably connected to one end of the hose, and has multiple steps to adapt to hoses of different diameters.

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