Liquid flow calibration system

Abstract

The utility model provides a kind of liquid flow calibration system, including detachable parallel installation volumetric method calibration device and standard method calibration device in the one end of the flowmeter to be examined, the volumetric method calibration device includes first pry seat and first calibration mechanism, the first calibration mechanism is installed on first pry seat, the standard method calibration device includes second pry seat and second calibration mechanism, the second calibration mechanism is installed on second pry seat, the first calibration mechanism and second calibration mechanism are connected with the flowmeter to be examined. The utility model integrates two kinds of calibration methods and functions of volumetric method and standard table method, user can select suitable method to calibrate liquid flowmeter on site according to actual situation, can carry out volumetric method and standard table method two ways of on-site calibration to various types and use medium liquid flowmeter under on-site online conditions.

Description

Technical Field

[0001] This utility model relates to the field of flow calibration technology, specifically to a liquid flow calibration system. Background Technology

[0002] Flow meters need to transmit liquid or gaseous media, and since they are consumables, when errors occur or calibration is required during field use, the flow meter often needs to be disassembled and sent to the flow meter manufacturer for calibration. This is often time-consuming and labor-intensive, not only wasting time and reducing efficiency, but also significantly increasing costs. Furthermore, the transportation process can affect the accuracy and reliability of the flow meter, resulting in the returned calibrated flow meter having poor accuracy and stability.

[0003] In view of this, the inventors of this case conducted in-depth research on the above-mentioned problems, which led to the creation of this case. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned shortcomings by providing a liquid flow calibration system that can be calibrated directly on-site or disassembled for laboratory-simulated on-site calibration, and is easy to assemble and disassemble.

[0005] The solution adopted by this utility model to solve the technical problem is: a liquid flow calibration system, including a volumetric calibration device and a standard calibration device installed in parallel at one end of the flow meter under test. The standard calibration device includes a skid mount and a calibration mechanism. The calibration mechanism is installed on the skid mount. Both the volumetric calibration device and the calibration mechanism are connected to the flow meter under test.

[0006] Furthermore, the flow meter under test is an electromagnetic flow meter, and a pneumatic clamp is provided between the flow meter under test and the volumetric calibration device and calibration mechanism.

[0007] Furthermore, the liquid flow calibration system also includes a main pipeline for simulating the field. The main pipeline includes a liquid storage tank and a circulation loop. Both ends of the circulation loop are connected to the liquid storage tank. The other end of the flow meter under test is installed in parallel on the circulation loop. A pressure stabilizing tank and a first ball valve are sequentially arranged between the flow meter under test and the circulation loop along the liquid flow direction.

[0008] Furthermore, the circulation loop includes a first valve, a pipeline pump, a check valve, a second valve, and a third valve connected sequentially along the liquid flow direction via pipelines, and the flow meter under test is installed in parallel between the second valve and the third valve.

[0009] Furthermore, the volumetric calibration device includes a second ball valve, a pneumatic regulating valve, a commutator, and a benchtop metering tank connected sequentially via pipelines along the liquid flow direction. One end of the commutator is connected to the benchtop metering tank, and the other end of the commutator is connected to a storage tank. The commutator is connected to a pulse counter, and the benchtop metering tank is equipped with a drain valve.

[0010] Furthermore, the benchtop metering tank is equipped with a reading glass tube and a level to ensure the accuracy of liquid level reading.

[0011] Furthermore, the calibration mechanism includes a third ball valve, a flow meter, and a fourth ball valve connected sequentially via pipelines along the liquid flow direction. The flow meter is a Coriolis mass flow meter, and the third and fourth ball valves are respectively installed at both ends of the second ball valve.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) This utility model integrates two calibration methods and functions: volumetric method and standard table method. Users can choose the appropriate method to calibrate the liquid flow meter on site according to the actual situation. It can perform on-site calibration of various types of liquid flow meters and liquids using the medium under on-site online conditions using both volumetric method and standard table method. Among them, the volumetric method has higher accuracy, and the accuracy of the standard metal measuring instrument system used is not less than 0.025%. The standard table method has the characteristics of high efficiency and convenience. The test data is collected to the host computer and can automatically calculate the error, uncertainty and other data.

[0014] (2) This utility model can realize both online calibration and laboratory offline calibration. It can eliminate the difference between the actual installation conditions of the flow meter and the device position of the offline calibration device, solve the drawbacks such as hydraulic system leakage caused by repeated disassembly during offline calibration, ensure the true accuracy and service life of the flow meter, reduce costs, and overcome the problems of other field calibration devices having a small scope of application and single type of function.

[0015] (3) This utility model achieves online and offline calibration of the flow meter under test by setting a skid-mounted structure. By setting the main pipeline to simulate the field conditions, the accuracy of the laboratory offline calibration is guaranteed. The skid-mounted structure is easy to disassemble and assemble. Usually, the standard meters used in the liquid flow standard devices of ordinary laboratories are mostly electromagnetic flow meters. Electromagnetic flow meters are relatively inexpensive, have stable performance, and have a good overall cost performance. However, the disadvantage is that the accuracy of this flow meter is not high and there is a requirement for a straight pipe section, which cannot be guaranteed in industrial fields. Therefore, this utility model selects a Coriolis mass flow meter. This flow meter does not have a requirement for a straight pipe section and has high accuracy. Although it is bulky, it is still very convenient to operate after being integrated into an integrated unit.

[0016] (4) The tabletop metering tank of this utility model is made of stainless steel, which can effectively prevent the corrosion of various strong corrosive media. Considering that the standard needs to be transported to different industrial sites, in order to accurately read the liquid level value, the metering tank is also equipped with a level calibration device to prevent reading deviation caused by level problems. Accurate reading of liquid level is the key to ensuring the correct volume of standard quantity. Therefore, the metering part of the metering tank is equipped with a caliper reading device. The caliper has high precision and is installed at the position of the liquid level metering diameter glass tube. By sliding the vernier, the liquid level can be read easily and accurately. In order to reduce visual error, there is a transparent scale line at the vernier. When reading, it is only necessary to ensure that the scale line and the liquid level are in a straight line. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the standard method calibration device;

[0020] Figure 3 This is a schematic diagram of the volumetric calibration device.

[0021] In the diagram: 1. Flow meter under test; 2. Pneumatic clamp meter; 3. Liquid storage tank; 4. Pressure stabilizing tank; 5. First ball valve; 6. First valve; 7. Pipeline pump; 8. Check valve; 9. Second valve; 10. Third valve; 11. Second ball valve; 12. Pneumatic regulating valve; 13. Reversing device; 14. Benchtop metering tank; 15. Drain valve; 16. Third ball valve; 17. Flow meter; 18. Fourth ball valve; 19. Reading glass tube; 20. Skid-mounted body; 21. Skid-mounted base. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0023] Example: Figure 1-3 As shown, this embodiment provides a liquid flow calibration system, including a volumetric calibration device and a standard calibration device installed in parallel at one end of the flow meter under test 1. The volumetric calibration device includes a skid-mounted body 20, and the standard calibration device includes a skid-mounted base 21 and a calibration mechanism. The calibration mechanism is installed on the skid-mounted base 21, and both the volumetric calibration device and the calibration mechanism are connected to the flow meter under test 1.

[0024] In this embodiment, the flow meter under test 1 is an electromagnetic flow meter, and a pneumatic clamp 2 is provided between the flow meter under test 1 and the volumetric calibration device and calibration mechanism.

[0025] In this embodiment, the liquid flow calibration system further includes a main pipeline for simulating the field. The main pipeline includes a liquid storage tank 3 and a circulation loop. Both ends of the circulation loop are connected to the liquid storage tank 3. The other end of the flow meter under test 1 is installed in parallel on the circulation loop. A pressure stabilizing tank 4 and a first ball valve 5 are sequentially arranged between the flow meter under test 1 and the circulation loop along the liquid flow direction.

[0026] In this embodiment, the circulation loop includes a first valve 6, a pipeline pump 7, a check valve 8, a second valve 9, and a third valve 10 connected in sequence along the liquid flow direction via pipelines, and the flow meter under test 1 is installed in parallel between the second valve 9 and the third valve 10.

[0027] In this embodiment, the volumetric calibration device includes a second ball valve 11, a pneumatic regulating valve 12, a reversing device 13, and a benchtop metering tank 14 connected sequentially through pipes along the liquid flow direction. One end of the reversing device 13 is connected to the benchtop metering tank 14, and the other end of the reversing device 13 is connected to the liquid storage tank 3. The reversing device 13 is connected to a pulse counter, and the benchtop metering tank 14 is provided with a drain valve 15.

[0028] In this embodiment, the benchtop metering tank 14 is equipped with a reading glass tube 19, and the benchtop metering tank 14 is also equipped with a level to ensure the accuracy of liquid level reading.

[0029] In this embodiment, the calibration mechanism includes a third ball valve 16, a flow meter 17, and a fourth ball valve 18 connected sequentially along the liquid flow direction via pipes. The flow meter 17 is a Coriolis mass flow meter 17, and the third ball valve 16 and the fourth ball valve 18 are respectively installed at both ends of the second ball valve 11.

[0030] Specific implementation process:

[0031] Calibration is performed using the volumetric method (measuring the volume of fluid flowing into the benchtop metering tank 14 during the measurement time to determine the flow rate): During calibration, the pipeline pump 7 draws test fluid from the storage tank 3 and pumps it into the pressure stabilizing tank 4, then through the flow meter 17 being calibrated. Once the fluid flow rate stabilizes, the reversing device 13 directs the fluid to the benchtop metering tank 14. Simultaneously, a pulse counter is triggered to accumulate the number of pulses from the flow meter 17 being calibrated. When the predetermined water volume or preset number of pulses is reached, the reversing device 13 automatically reverses the flow, directing the water flow from the benchtop metering tank 14... When the metering tank 14 is replaced with the storage tank 3, the volume V of fluid entering the benchtop metering tank 14 during this period can be read from the scale of the reading glass tube of the benchtop metering tank 14. The number of pulses N of the calibrated flow meter 17 displayed by the pulse counter is recorded. The number of pulses N of the calibrated flow meter 17 is compared with the obtained standard volume V to determine the instrument constant and accuracy of the calibrated flow meter 17. The instantaneous flow rate of the flow meter 17 is indicated by the frequency indicator 20. The system accuracy of this method can reach 0.025%.

[0032] Standard method calibration: Separate the standard method calibration mechanism from the system, mount it on a vehicle, and transport it to the site. The lower end of the standard method calibration mechanism is the liquid inlet, and the upper end is the liquid outlet, both connected by flange hoses. The liquid inlet and outlet are connected to the relevant interfaces of the flow meter 1 under test on site. Then, slowly open the third ball valve 16 and the fourth ball valve 18 to fill the pipeline with liquid. After the pipeline, mass flow meter 17, and return oil pipeline are filled with liquid, open the fourth ball valve 18 and allow the liquid to circulate for a period of time. After confirming that the pipeline is filled with liquid, close the fourth ball valve 18 to prepare for calibration. Start calibration by opening the fourth ball valve 18. After a certain amount of liquid has flowed through the mass flow meter 17, close the fourth ball valve 18 and read the indication value of the flow meter 1 under test and the indication value of the mass flow meter 17. Compare the two values ​​to complete the verification / calibration of the flow meter 17 on site.

[0033] The above description is merely an embodiment of this utility model and does not limit the scope of patent protection of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this utility model.

Claims

1. A liquid flow rate calibration system, characterized in that: It includes a volumetric calibration device and a standard calibration device installed in parallel at one end of the flow meter under test. The standard calibration device includes a skid mount and a calibration mechanism. The calibration mechanism is installed on the skid mount. Both the volumetric calibration device and the calibration mechanism are connected to the flow meter under test.

2. The liquid flow calibration system according to claim 1, characterized in that: The flow meter under test is an electromagnetic flow meter, and a pneumatic clamp is provided between the flow meter under test and the volumetric calibration device and calibration mechanism.

3. The liquid flow calibration system according to claim 1, characterized in that: The liquid flow calibration system also includes a main pipeline for simulating the field. The main pipeline includes a liquid storage tank and a circulation loop. Both ends of the circulation loop are connected to the liquid storage tank. The other end of the flow meter under test is installed in parallel on the circulation loop. A pressure stabilizing tank and a first ball valve are arranged sequentially between the flow meter under test and the circulation loop along the liquid flow direction.

4. The liquid flow calibration system according to claim 3, characterized in that: The circulation loop includes a first valve, a pipeline pump, a check valve, a second valve, and a third valve connected in sequence along the liquid flow direction via pipelines, and the flow meter under test is installed in parallel between the second valve and the third valve.

5. The liquid flow calibration system according to claim 3, characterized in that: The volumetric calibration device includes a second ball valve, a pneumatic regulating valve, a reversing device, and a benchtop metering tank connected sequentially via pipelines along the liquid flow direction. One end of the reversing device is connected to the benchtop metering tank, and the other end of the reversing device is connected to a storage tank. The reversing device is connected to a pulse counter, and the benchtop metering tank is equipped with a drain valve.

6. The liquid flow calibration system according to claim 5, characterized in that: The benchtop metering tank is equipped with a reading glass tube and a level to ensure the accuracy of liquid level reading.

7. The liquid flow calibration system according to claim 5, characterized in that: The calibration mechanism includes a third ball valve, a flow meter, and a fourth ball valve connected sequentially via pipelines along the liquid flow direction. The flow meter is a Coriolis mass flow meter, and the third and fourth ball valves are respectively installed at both ends of the second ball valve.

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