Calibration device for metal tube float flowmeter

Abstract

The invention is applicable to the technical field of flowmeter calibration, and provides a calibration device for a metal tube float flowmeter, the calibration device comprises a workbench, a liquid supply assembly is arranged on one side of the workbench, the metal tube float flowmeter, a bypass assembly and a weighing assembly are sequentially arranged in the middle of the workbench, the liquid supply assembly comprises a liquid supply mechanism, and the metal tube float flowmeter is arranged in the middle of the workbench. A first sensor is arranged on one side of the liquid supply mechanism, an adjusting structure is arranged at the end, away from the liquid supply mechanism, of the first sensor, a second sensor is arranged above the adjusting structure, the metal pipe float flowmeter is arranged over the second sensor, and the liquid supply mechanism comprises a connecting pipe. A water pump is arranged on one side of the connecting pipe, a hexagonal flow guide pipe in the adjusting pipe is matched with a conical through hole of the adjusting plate, liquid flow is converted into laminar flow from turbulent flow, the problem that a floater moves due to unstable liquid flow is effectively solved, the liquid flow stability of the inlet end of the metal pipe float flowmeter is improved, and the accuracy of calibration data is improved.

Description

Technical Field

[0001] This invention relates to the field of flow meter calibration technology, and more specifically, to a calibration device for a metal tube float flow meter. Background Technology

[0002] Metal tube float flowmeters are flow meters based on the principle of variable area measurement. The core of the flowmeter consists of a vertically tapered tube that expands from bottom to top and a float that can move up and down. When the fluid flows from bottom to top through the annular gap formed by the tapered tube and the float, the upward force generated by the differential pressure of the float is balanced by its own weight. At this time, the height of the float corresponds to the flow rate, and its displacement is transmitted to an external indicator or transmitter through magnetic coupling or other means. Based on the above characteristics of metal tube float flowmeters, they need to be calibrated after production. Generally, the static mass method is used for calibration.

[0003] Currently, the static mass method for calibrating flow meters involves using a constant pressure source to ensure a stable flow of fluid through the meter under test. A commutator switches the flow to a weighing container, simultaneously recording the time and the output pulses of the meter under test. A standard scale is used to measure the mass of the fluid flowing into the container, and then this mass is compared with the mass reading of the meter under test to determine the error.

[0004] Based on the characteristics of metal tube float flowmeters, during the calibration process, the liquid pushes the float from bottom to top. When the liquid flow pressure on the float is balanced with the float's weight and buoyancy, the float stabilizes at a certain position, which corresponds to a fixed flow rate value.

[0005] However, the liquid flow can become unstable as it flows from bottom to top. If the flow is unstable, the liquid pressure will change frequently, and the float will move up and down at the equilibrium position, making it impossible to accurately read the corresponding flow rate. The calibration data will then lose its reference value. To address this issue, a calibration device for metal tube float flowmeters is proposed to improve the existing problems. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a calibration device for a metal tube float flowmeter.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A calibration device for a metal tube float flowmeter includes a worktable.

[0008] A liquid supply assembly is located on one side of the worktable.

[0009] The liquid supply component includes a multi-level monitoring module consisting of a first sensor and a second sensor, and a liquid supply mechanism.

[0010] The liquid supply mechanism includes a fluid drive module consisting of a water pump and a pressure compensation module consisting of a compensation valve.

[0011] The first sensor is used to collect the pressure P1 in the middle section of the pipeline, and the second sensor is used to collect the pressure P2 in the target area of ​​the flow meter.

[0012] The water pump has a built-in pressure sensor, which is used to collect the initial pressure P0 at the output end of the water pump.

[0013] The compensation valve is installed in the outlet pipeline of the water pump and is used to compensate for pipeline pressure loss.

[0014] It also includes a control module, which is configured to be electrically connected to the water pump's built-in pressure sensor, first sensor, second sensor, compensation valve and water pump respectively, for receiving P0, P1 and P2 and executing pressure regulation logic.

[0015] The workbench is equipped with a metal tube float flowmeter, a bypass assembly, and a weighing assembly in sequence at the center.

[0016] The present invention is further configured such that: the liquid supply assembly further includes a liquid storage tank, the liquid storage tank is connected to the liquid supply mechanism, one end of the liquid supply mechanism is connected to a first tube, an adjustment structure is provided on one side of the first tube, a second tube is provided at the middle position of the first tube and the adjustment structure, and both ends of the second tube are connected to the adjustment structure and the liquid supply mechanism, respectively.

[0017] The present invention is further configured such that: the metal tube float flowmeter is disposed above the adjustment structure, and a third tube is disposed above the metal tube float flowmeter; the adjustment structure, the metal tube float flowmeter, and the third tube are connected in sequence.

[0018] The present invention is further configured such that: a commutator is provided on one side of the third tube body, the third tube body is connected to the commutator, the bypass component is provided below the commutator, the weighing component is provided on one side of the commutator, and the bypass component and the weighing component are respectively connected to the commutator.

[0019] The present invention is further configured such that: the adjusting structure sequentially includes a first connecting pipe, an adjusting pipe and a second connecting pipe, an adjusting plate is provided inside the second connecting pipe, the first connecting pipe is connected to the second pipe body, the adjusting pipe is connected to the first connecting pipe through a flange, and a second connecting pipe is provided above the adjusting pipe, the second connecting pipe being connected to the adjusting pipe through a flange.

[0020] The invention is further configured such that: the adjusting plate is disposed inside the second connecting pipe, an installation pipe is disposed above the second connecting pipe, the two ends of the installation pipe are respectively connected to the second connecting pipe and the metal tube float flow meter, the second sensor is disposed outside the installation pipe, and the second sensor is used to measure the pressure of the liquid at the inlet end of the metal tube float flow meter.

[0021] The present invention is further configured such that: the adjusting tube includes a pipe, the pipe is shaped as a hollow cylindrical structure, and the inside of the pipe is provided with a plurality of guide tubes arranged in a sequential and uniform manner, the guide tubes being shaped as hexagonal structures.

[0022] The present invention is further configured such that: the adjusting plate includes a plate body, the plate body has a plurality of through holes, the through holes are configured to be tapered, the side with the larger diameter of the tapered structure is close to the adjusting tube, the side with the smaller diameter of the tapered structure is close to the metal tube float flowmeter, and the second sensor is disposed at the middle position between the through hole and the metal tube float flowmeter.

[0023] The present invention is further configured such that: the bypass component includes a collection tank, the inside of the collection tank is hollow, an output pipe is connected to the bottom of the collection tank, a first switching valve is provided at the bottom of the output pipe, an input pipe is provided at the top of the collection tank, and the input pipe is connected to the commutator.

[0024] The present invention is further configured such that: the weighing component includes a standard weighing container, an inlet pipe is provided on one side of the standard weighing container, the inlet pipe is connected to a commutator, a weighing structure is provided at the bottom of the standard weighing container, a weighing sensor is built into the weighing structure, and a second switching valve is provided on the side of the standard weighing container away from the inlet pipe.

[0025] In summary, this application includes at least one of the following beneficial technical effects: (1) By adjusting the fit between the hexagonal guide tube inside the tube and the conical through hole of the regulating plate, this device can change the liquid flow from turbulent flow to laminar flow and level the flow velocity, effectively solving the problem of float movement caused by unstable liquid flow, improving the stability of liquid flow at the inlet end of the metal tube float flowmeter, and improving the accuracy of calibration data.

[0026] (2) The dual-loop pressure control logic of water pump and compensating valve is adopted. Combined with multi-level monitoring of the first sensor and the second sensor, the pipeline pressure loss can be quantified in real time and the liquid supply pressure can be dynamically adjusted.

[0027] (3) The bypass component and the weighing component can be flexibly switched through the commutator. The liquid flow can be pre-stabilized through the bypass component first, and then switched to the weighing component for static mass calibration, which reduces the impact of the initial unstable liquid flow on the weighing data and improves the efficiency of single calibration.

[0028] (4) By constructing a pressure chain of source, middle section and target through three-level pressure monitoring, the pressure loss of pipeline is quantified in segments, providing data support for more accurate calibration and solving the one-sided problem of traditional single-point monitoring. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a calibration device for a metal tube float flowmeter according to the present invention.

[0030] Figure 2 In this invention Figure 1 Top view.

[0031] Figure 3 for Figure 1 Schematic diagram of a partial structure.

[0032] Figure 4 for Figure 3 The front view.

[0033] Figure 5 This is a schematic diagram of the adjustment structure in this invention.

[0034] Figure 6 This is a schematic diagram of the adjusting tube in this invention.

[0035] Figure 7 This is a schematic diagram of the structure of the adjustment plate in this invention.

[0036] Figure 8 for Figure 7 A bottom view.

[0037] Figure 9 for Figure 6 Top view.

[0038] Explanation of reference numerals in the attached diagram: 1. Workbench; 2. Liquid supply assembly; 21. Liquid storage tank; 22. Liquid supply mechanism; 221. Water pump; 222. Compensating valve; 223. Connecting pipe; 24. First sensor; 25. Second pipe body; 26. Adjustment structure; 261. Adjusting pipe; 2611. Pipeline; 2612. Guide pipe; 262. Adjusting plate; 2621. Plate body; 2622. Through hole; 263. Second connecting pipe; 264. First connecting pipe; 27. Third pipe body; 28. Commutator; 29. ​​Second sensor; 3. Bypass assembly; 31. Collection tank; 32. First switching valve; 33. Output pipe; 34. Input pipe; 4. Weighing assembly; 41. Standard weighing container; 42. Weighing structure; 43. Second switching valve; 44. Inlet pipe; 5. Metal tube float flow meter. Detailed Implementation

[0039] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] Please see Figures 1-9 The present invention provides the following technical solutions: Example 1, see Figure 1 A calibration device for a metal tube float flowmeter includes a workbench 1, a liquid supply assembly 2 on one side of the workbench 1, and a metal tube float flowmeter 5, a bypass assembly 3, and a weighing assembly 4 arranged sequentially in the middle of the workbench 1.

[0042] The liquid supply component 2 is used to provide the required liquid for the entire calibration device. In this embodiment, the liquid used is deionized water. The bypass component 3 and the weighing component 4 work together to calibrate the metal tube float flowmeter 5.

[0043] During the detection process, the liquid is input from bottom to top in the metal tube float flowmeter 5, which may cause unstable liquid flow. In order to better solve the above problems, it is necessary to consider the source, that is, to control the flow state of the liquid at the source and keep the liquid flow pressure in a constant and stable state.

[0044] The specific structure of the liquid supply assembly 2 is as follows: See Figures 1-4 The liquid supply component 2 includes a liquid storage tank 21 and a liquid supply mechanism 22. The liquid storage tank 21 is connected to the liquid supply mechanism 22. One end of the liquid supply mechanism 22 is connected to a first tube. A second tube 25 is provided at the middle position between the first tube and the adjustment structure 26. The two ends of the second tube 25 are connected to the adjustment structure 26 and the liquid supply mechanism 22, respectively.

[0045] See Figures 1-4 The metal tube float flowmeter 5 is positioned above the regulating structure 26, and a third tube body 27 is positioned above the metal tube float flowmeter 5. The regulating structure 26, the metal tube float flowmeter 5, and the third tube body 27 are connected in sequence.

[0046] See Figures 1-4 A commutator 28 is provided on one side of the third tube body 27. The third tube body 27 is connected to the commutator 28. The bypass component 3 is located below the commutator 28. The weighing component 4 is located on one side of the commutator 28. The bypass component 3 and the weighing component 4 are respectively connected to the commutator 28.

[0047] The storage tank 21 is equipped with an exhaust valve, an inlet, an outlet, and a scale. The exhaust valve is used to release gas before calibration, the inlet is for easy liquid injection, the outlet is connected to the liquid supply mechanism 22, and the scale is for easy observation of the liquid volume.

[0048] A mounting base is provided at the middle position between the third tube body 27 and the adjustment structure 26. The mounting base is used to fix the metal tube float flowmeter 5. In this embodiment, a flange can be used for installation.

[0049] The commutator 28 includes a drive motor, a flow guiding component, and a sensing and control unit. The position of the flow guiding component can be detected by the sensing and control unit, and the position of the flow guiding component can be switched in a timely manner. In practical applications, the position of the flow guiding component can be adjusted by the drive motor according to the calibration requirements, so that the liquid flowing to the bypass component 3 and the weighing component 4 can be reversed to meet the requirements of mass calibration.

[0050] During the calibration process, the liquid flow path is as follows: storage tank 21, liquid supply mechanism 22, first pipe body, second pipe body 25, adjustment structure 26, metal tube float flow meter 5, third pipe body 27, and commutator 28. At the commutator 28, the liquid flow direction is adjusted as needed so that the liquid first passes through the bypass component 3 and then turns to the weighing component 4 for weighing, and then calibration is performed.

[0051] In order to adjust the flow of liquid at the liquid supply source, it is necessary to design the liquid supply mechanism 22. The specific structure of the liquid supply mechanism 22 is as follows: See Figures 1-4 The liquid supply mechanism 22 includes a connecting pipe 223. A water pump 221 is provided on one side of the connecting pipe 223. The water pump 221 has a built-in pressure sensor for measuring the internal pressure of the water pump 221. A compensation valve 222 is provided on the other side of the connecting pipe 223. The connecting pipe 223 is connected to the water pump 221 and the compensation valve 222 respectively.

[0052] The liquid storage tank 21 serves as the liquid source and is connected to the water pump 221 and the compensation valve 222 via pipelines.

[0053] The water pump 221 is located between the liquid storage tank 21 and the connecting pipe 223. It is the main power source for liquid supply and has a built-in pressure sensor for real-time monitoring of its own pressure.

[0054] The compensation valve 222 is connected in parallel between the liquid storage tank 21 and the connecting pipe 223. It is a bypass structure and can adjust the flow distribution or supplement the flow of the water pump 221 by changing the opening degree.

[0055] In this embodiment, the water pump 221 is a variable frequency centrifugal pump, which integrates a motor, a frequency converter, a pump body and a pressure sensor.

[0056] In this embodiment, the compensating valve 222 is an electromagnetic pressure valve, which is driven to open and close electrically.

[0057] Before actual calibration, add deionized water to the liquid level mark in the storage tank 21, open the vent valve of the storage tank 21 to release the air in the tank; start the water pump 221 and run it under no-load for 5 minutes to check for leaks at the pipeline connections.

[0058] During the actual calibration process, the pressure sensor built into the water pump 221 monitors the initial pressure at the pump output end, reflecting the pressure state of the liquid supply power. Based on the detection results, the water pump 221 can adopt a variable frequency regulation method, that is, dynamically adjust its output power so that the liquid flows out in a constant pressure and stable state.

[0059] The specific frequency conversion adjustment process is as follows: If the pressure of water pump 221 is lower than the set value, it indicates that the liquid flow is insufficient. The frequency of variable frequency operation of water pump 221 can be increased to increase the liquid output of the pump and improve the pipeline pressure.

[0060] If the pressure is higher than the set value, it indicates that the flow rate is excessive. This can reduce the frequency of the variable frequency operation of the water pump 221, reduce the pump's liquid output, and lower the pipeline pressure.

[0061] The flow rate is initially stabilized by using frequency conversion regulation, which means the initial stabilization of the liquid pressure output by water pump 221 is achieved.

[0062] The compensation valve 222 adjusts its opening according to the adjustment of the water pump 221, and performs fine compensation and adjustment for the small fluctuations in the output liquid pressure of the water pump 221 after it has initially stabilized.

[0063] The detailed compensation adjustment process is as follows: If the pipeline pressure is still slightly low after the water pump 221 is adjusted, the compensation valve 222 is closed to reduce the diversion and allow more liquid to flow to the connecting pipe 223 to help increase the pressure.

[0064] If the pipeline pressure is still slightly high after the water pump 221 is adjusted, the compensation valve 222 is opened wider to increase the flow diversion and reduce the amount of liquid flowing to the connecting pipe 223, thereby helping to reduce the pressure.

[0065] The compensation valve 222 achieves secondary fine flow stabilization by adjusting the opening degree.

[0066] In the above process, the liquid flows out of the storage tank 21, passes through the liquid supply mechanism 22, and reaches the next position. The water pump 221 in the liquid supply mechanism 22 provides power for the next stage. The compensation valve 222 can be adjusted according to the detection result of the pressure sensor built into the water pump 221.

[0067] In order to adjust the compensation valve 222 more precisely, a first sensor 24 is installed at the outlet end of the water pump 221. The first sensor 24 is located on the outside of the first pipe body. The first sensor 24 is used to measure the pressure of the liquid after it flows out through the liquid supply mechanism 22. The first sensor 24 is a pressure sensor.

[0068] The first sensor 24 collects pressure data from the downstream section of the connecting pipe 223, forming a two-point pressure monitoring system with the pump end pressure of the built-in pressure sensor in the water pump 221.

[0069] If the difference between the pump end pressure and the downstream pressure is too large, it indicates that there is abnormal resistance in the pipeline, or that the coordinated adjustment effect between the water pump 221 and the compensation valve 222 is insufficient. The frequency of the water pump 221 and the opening of the compensation valve 222 need to be optimized again.

[0070] If the first sensor 24 detects a large fluctuation in downstream pressure, it can trigger the water pump 221 and the compensation valve 222 to adjust again, forming a closed-loop control to ensure that the liquid pressure delivered to the subsequent components is sufficiently stable.

[0071] The specific structure of bypass component 3 is as follows: See Figures 1-4 The bypass assembly 3 includes a collection tank 31, which is hollow inside. An output pipe 33 is connected to the bottom of the collection tank 31. A first switching valve 32 is provided at the bottom of the output pipe 33. An input pipe 34 is provided at the top of the collection tank 31 and is connected to the commutator 28.

[0072] When the commutator 28 switches to be connected to the input pipe 34, the liquid flows into the collection tank 31. After calibration is completed, the liquid inside the collection tank 31 can be released by opening the first switch valve 32 so that the next calibration can be performed.

[0073] The specific structure of weighing component 4 is as follows: See Figures 1-4 The weighing assembly 4 includes a standard weighing container 41, an inlet pipe 44 is provided on one side of the standard weighing container 41, the inlet pipe 44 is connected to the commutator 28, a weighing structure 42 is provided at the bottom of the standard weighing container 41, the weighing structure 42 has a built-in weighing sensor, and a second switching valve 43 is provided on the side of the standard weighing container 41 away from the inlet pipe 44.

[0074] The bypass component 3 and the weighing component 4 can be flexibly switched through the commutator 28. The liquid flow can be pre-stabilized through the bypass component 3 first, and then switched to the weighing component 4 for static mass calibration. This reduces the impact of the initial unstable liquid flow on the weighing data, improves the efficiency of single calibration, and is compatible with metal tube float flowmeters 5 with different ranges.

[0075] In Example 2, the above structure can stably supply the liquid pressure at the supply end and gradually achieve the calibration of the metal tube float flowmeter 5. Since the liquid flows from bottom to top, fluid instability is likely to occur below the metal tube float flowmeter 5. Fluid instability will affect the movement of the float, and thus affect the subsequent calibration results.

[0076] In order to make the fluid below the metal tube float flowmeter 5 more stable, an adjustment structure 26 is set below the metal tube float flowmeter 5 to adjust it and reduce the impact of liquid flow.

[0077] The specific structure of adjustment structure 26 is as follows: See Figure 5 The adjustment structure 26 includes an adjustment tube 261, and an adjustment plate 262 is provided above the adjustment tube 261.

[0078] See Figure 5 The adjusting structure 26 also includes a first connecting pipe 264, which is connected to the second pipe body 25. The adjusting pipe 261 is connected to the first connecting pipe 264 through a flange. A second connecting pipe 263 is provided above the adjusting pipe 261, and the second connecting pipe 263 is connected to the adjusting pipe 261 through a flange.

[0079] See Figure 6 The adjusting plate 262 is located inside the second connecting pipe 263. An installation pipe is provided above the second connecting pipe 263, and the two ends of the installation pipe are connected to the second connecting pipe 263 and the metal tube float flow meter 5, respectively.

[0080] The liquid flow is stabilized by adjusting the tube 261 and adjusting the plate 262, thereby reducing the impact of the liquid flow on the metal tube float flowmeter 5.

[0081] The vertical length of the adjusting pipe 261 is greater than the vertical length of the second connecting pipe 263. The liquid first passes through the adjusting pipe 261 and then through the adjusting plate 262.

[0082] During the process of passing through the regulating pipe 261, the turbulent airflow is dispersed and large-scale eddies are eliminated, so that the fluid direction tends to be consistent. When the liquid passes through the regulating plate 262, the fluid is further stabilized, and finally the liquid delivered to the metal tube float flowmeter 5 position is in a stable flow state, reducing the impact of liquid instability on calibration.

[0083] To further enhance the rectification and current stabilization effects, the regulating tube 261 and the regulating plate 262 were designed respectively.

[0084] The specific structure of the adjusting tube 261 is as follows: See Figure 5 and Figure 9The adjusting pipe 261 includes a pipe 2611, which is a hollow cylindrical structure. Inside the pipe 2611, there are several guide pipes 2612 arranged in a sequential and uniform manner. The guide pipes 2612 are hexagonal in shape.

[0085] Among them, the adjacent walls of the hexagonal channel of the guide pipe 2612 have an included angle of 120°, and the channels are closely arranged without gaps. After the liquid enters, it will be forcibly confined in the independent hexagonal channel. Compared with the circular channel, which is prone to liquid flow movement due to uneven gaps, or the square channel, which is prone to lateral vortices at right angles, the hexagonal channel can block the lateral diffusion of the liquid flow, forcing the liquid flow to flow from bottom to top along the pipeline axis, and quickly eliminating the rotating vortices or secondary flows brought by the upstream pipeline.

[0086] After the liquid passes through the guide tube 2612, the flow state can be changed from turbulent to laminar. However, there may still be laminar boundary layer instability at the outlet. Therefore, the flow is stabilized by adjusting the plate 262 to reduce the impact of fine flow on the calibration of the metal tube float flowmeter 5.

[0087] The specific structure of the regulating plate 262 is as follows: See Figure 7 and Figure 8 The regulating plate 262 includes a plate body 2621, on which a plurality of through holes 2622 are provided. The through holes 2622 are shaped as a conical structure. The side with the larger diameter of the conical structure is close to the regulating tube 261, and the side with the smaller diameter of the conical structure of the through hole 2622 is close to the metal tube float flowmeter 5.

[0088] The conical plate 2621 receives the liquid flow from the regulating pipe 261. After being combed by the regulating pipe 261, the liquid flow forms liquid flow bundles with different flow velocities. Different liquid flow bundles enter through the large end of the conical plate 2621 and exit through the small end. During this process, the structure of the conical plate 2621, with the large end in and the small end out, forms a converging channel, which allows these liquid flow bundles with different flow velocities to merge and level out their speeds during the flow process. In this process, the slower liquid flow will be forcibly accelerated and gradually leveled out with the faster liquid flow, ultimately achieving uniform flow velocity.

[0089] The function of the regulating plate 262 is to carry on the preliminary results of the regulating pipe 261 and to perform refined flow field optimization. The large end facing the regulating pipe 261 utilizes the hydrodynamic characteristics of the converging flow channel to achieve uniform speed, stable laminar flow, and directional guidance.

[0090] In Example 3, combined with Examples 1 and 2, the liquid flow below the metal tube float flowmeter 5 can be rectified and stabilized by adjusting the pipe 261 and the regulating plate 262, reducing the impact of unstable liquid flow on the calibration of the metal tube float flowmeter 5. However, the liquid pressure will be lost during the flow and rectification process in the pipeline.

[0091] Therefore, it is necessary to make more detailed adjustments to the liquid supply mechanism 22 at the liquid supply source. The adjustment of the liquid supply mechanism 22 is used to compensate for the pressure loss, so that the liquid flow pressure at the inlet end of the metal tube float flowmeter 5 meets the calibration requirements and improves the calibration accuracy.

[0092] In addition to setting the first sensor 24 at the outlet end of the water pump 221, a second sensor 29 also needs to be set above the regulating plate 262. The liquid flow pressure is detected by the second sensor 29 and the first sensor 24 respectively, so as to better adjust the water pump 221.

[0093] The specific structures of the first sensor 24 and the second sensor 29 are as follows: A second sensor 29 is disposed above the regulating structure 26, and a metal tube float flowmeter 5 is disposed directly above the second sensor 29.

[0094] The second sensor 29 is located on the outside of the mounting tube and is used to measure the pressure of the liquid at the inlet end of the metal tube float flowmeter 5.

[0095] The first sensor 24 is disposed on the outside of the first tube body. The first sensor 24 is used to measure the pressure of the liquid after it flows out from the liquid supply mechanism 22.

[0096] By placing the second sensor 29 between the metal tube float flowmeter 5 and the regulating plate 262, the pressure of the liquid flow after rectification and stabilization can be better detected, which facilitates better adjustment of the water pump 221 and the compensation valve 222 to reduce the impact of unstable liquid flow.

[0097] Both the first sensor 24 and the second sensor 29 are pressure sensors, and the compensation valve 222 is for pressure compensation. Based on the detection and comparison of data, the water pump 221 and the compensation valve 222 form a dual control of basic regulation and compensation regulation, which further realizes the stabilization of the liquid supply end and reduces the occurrence of liquid flow turbulence from the source.

[0098] In addition, both the first sensor 24 and the second sensor 29 are installed on the outside of the pipeline, and the detection probes of the sensors are inserted into the pipeline to perform corresponding detection.

[0099] To better analyze the above data, this device also includes a calibration system, which includes a fluid drive module, a pressure compensation module, a multi-stage monitoring module, a control module, and a metal tube float flowmeter.

[0100] The fluid drive module includes a water pump 221, which has a built-in pressure sensor for real-time acquisition of the initial pressure P0 at the output of the water pump 221.

[0101] The pressure compensation module includes a compensation valve 222, which is installed in the outlet pipeline of the water pump 221 and is used to dynamically compensate for pipeline pressure loss.

[0102] The multi-level monitoring module includes a first sensor 24 and a second sensor 29. The first sensor 24 is located in the middle section of the pipeline between the regulating plate 262 and the water pump 221 and is used to collect the pressure P1 in the middle section of the pipeline. The second sensor 29 is installed directly below the metal tube float flowmeter 5 and is used to collect the pressure P2 in the target area of ​​the flowmeter.

[0103] The control module is electrically connected to the built-in pressure sensor of the water pump 221, the first sensor 24, the second sensor 29, the compensation valve 222 and the water pump 221 respectively, and is used to receive P0, P1 and P2 and execute pressure regulation logic.

[0104] The fluid drive module, pressure compensation module, multi-stage monitoring module, and metal tube float flowmeter 5 are connected in sequence through the pipelines involved in this device to form a closed calibration fluid path.

[0105] The control module includes a data processing unit, a compensation and adjustment unit, and a basic adjustment unit.

[0106] The data processing unit is used to calculate the first pressure loss difference. Difference between the second pressure loss .

[0107] The formula for calculating the first pressure loss difference is as follows:

[0108] in, P0 represents the first pressure loss difference, where P0 is the initial pressure of pump 221 and P1 is the pressure in the middle section of the pipeline.

[0109] The formula for calculating the second pressure loss difference is as follows:

[0110] in, The second pressure loss difference is P1, where P1 is the pressure in the middle section of the pipeline and P2 is the pressure in the target area of ​​the flow meter.

[0111] The compensation adjustment unit is used to adjust according to The fluctuation range controls the opening degree of the compensation valve 222.

[0112] The basic adjustment unit is used to adjust according to P2 adjusts the output frequency of water pump 221.

[0113] Before specific calibration, upper limit threshold, lower limit threshold, abnormal threshold and target pressure value are set respectively.

[0114] The upper and lower thresholds constitute the stable interval, which is: The theoretical calculation value is ±5%, which is based on the pipe inner diameter, fluid viscosity and calibrated flow rate preset. In this embodiment, the liquid used is deionized water.

[0115] The abnormal threshold is The initial calibration value is ±10%, and the initial calibration value is the value when the calibration system is under no-load. Measured value.

[0116] The target pressure value is set according to the range specification of the metal tube float flowmeter 5, and the deviation threshold is ±2% of the target pressure value.

[0117] The specific steps for calibration are as follows: First, before actual calibration, add deionized water to the liquid level mark in the storage tank 21 and open the vent valve of the storage tank 21 to release the air inside the tank; start the water pump 221 and run it under no-load for 5 minutes to check for leaks at the pipeline connections; perform zero-point calibration on the first sensor 24, the second sensor 29, and the weighing structure 42 using calibration equipment to ensure that the error is within the allowable range; close the first switch valve 32 and the second switch valve 43, and open the compensation valve 222 to the initial opening degree, wherein the initial opening degree of the compensation valve 222 is 50% and the initial frequency of the water pump 221 is 50Hz.

[0118] Next, start the calibration system and control the commutator 28 to direct the liquid flow to the bypass component 3. Maintain this state for 10 minutes until the pressure values ​​of the first sensor 24 and the second sensor 29 stabilize. Adjust the commutator 28 through the control module to switch the liquid flow to the weighing component 4, and record the reading of the metal tube float flowmeter 5 and the mass data of the weighing structure 42. After a single calibration is completed, keep the liquid flow to the weighing component 4 until the weighing structure 42 displays a stable mass, and then turn off the water pump 221.

[0119] Finally, open the first switch valve 32 to drain the liquid in the bypass assembly 3 collection tank 31, open the second switch valve 43 to drain the liquid in the standard weighing container 41 of the weighing assembly 4, reset the opening of the compensation valve 222 to 50%, and reset the frequency of the water pump 221 to 50Hz; close all valves, clean the residual liquid in the pipeline, and complete the reset.

[0120] The specific operation process of the calibration system is as follows: S1. Start the calibration system. The fluid is driven by the water pump 221 and flows through the compensation valve 222, the first sensor 24, the second sensor 29 and the metal tube float flow meter 5 in sequence. The built-in pressure sensor of the water pump 221, the first sensor 24 and the second sensor 29 collect P0, P1 and P2 in real time and transmit them to the control module.

[0121] S2, The control module calculates through the data processing unit. and ; S3, Compensation Adjustment Unit Judgment Is it within the preset stable range? like > Upper limit threshold, control pressure compensation valve 222 to increase opening degree to reduce local resistance and reduce pressure loss; like When the lower threshold is exceeded, the control pressure compensation valve 222 reduces its opening to suppress pressure fluctuations and increase local resistance.

[0122] S4, Basic Adjustment Unit Judgment Does it exceed the preset abnormal threshold? like >Abnormal threshold, determine that the flow resistance in the front section of the pipeline is too high, adjust the water pump 221 to reduce the output frequency to reduce P0 and avoid pressure overload; like If the abnormal threshold is exceeded, it is determined that the flow resistance in the upstream section of the pipeline is too low. The water pump 221 is adjusted to increase the output frequency to increase P0 and compensate for the pressure loss in the upstream section.

[0123] During the calibration process, the adjustment processes in steps S3 and S4 are carried out simultaneously, and the response priority of the compensation adjustment unit is higher than that of the basic adjustment unit, so as to prioritize stabilizing the pressure in the target area of ​​the flow meter.

[0124] S5. The basic adjustment unit monitors the deviation between P2 and the preset target pressure value in real time. If P2 < target pressure value - deviation threshold, increase the output frequency of water pump 221 to increase P0 until P2 returns to the target range; If P2 > target pressure value + deviation threshold, reduce the output frequency of variable frequency pump 221 to reduce P0 until P2 returns to the target range; Repeat the above steps until the metal tube float flowmeter 5 completes the static mass method calibration under stable pressure.

[0125] The operational logic of steps S3, S4, and S5 above is as follows: The control module's data processing unit establishes a coupling model of the adjustment amount, distinguishes the sources of P1 changes, and makes targeted corrections to the adjustment amount.

[0126] If the change in P1 is caused by step S3: Changes in the opening of compensating valve 222 directly affect the local resistance of the pipeline, causing fluctuations in P1. For example, if the opening of compensating valve 222 increases, the local resistance decreases, and ultimately P1 increases. At this point, the model automatically corrects itself. The abnormal threshold is used to avoid the basic regulating unit from misjudging that the flow resistance is too small and blindly reducing the frequency of water pump 221.

[0127] If the change in P1 is caused by step S4: Increasing the frequency of water pump 221 will increase P0, which in turn will increase P1. At this point, the model will automatically correct itself. The stable range is ensured to prevent the compensation regulating unit from misjudging the pressure loss as too large and blindly increasing the opening of the compensation valve 222.

[0128] The core objective of dynamic adjustment is to stabilize P2 within the target pressure value ± deviation threshold, while and Within their respective dynamic reference ranges: If P2 is stable, even if or If the deviation is slightly from the initial range, the adjustment will stop as long as it remains within the dynamic reference range. If P2 is not stable, it should be quickly corrected by S3 first, while S4 slowly adjusts the base pressure according to the dynamic changes of P1 until P2 reaches the target.

[0129] The termination condition for the above adjustment is when P2 stabilizes at the target pressure value ± the deviation threshold, and , When all three are within the dynamic reference range, S3, S4, and S5 simultaneously stop adjusting and enter steady-state monitoring mode, which means that only data is collected and no adjustment is performed.

[0130] The calibration system aims to achieve P2 stability as its ultimate goal. and The allowable range is dynamically corrected as P1 changes in real time, avoiding misadjustment caused by static threshold; when S3 and S4 run synchronously, the model distinguishes the source of P1 change and decouples the adjustment interference; S5 acts as a fallback adjustment, forming a three-level closed loop with S3 and S4 of local compensation, overall adjustment and target correction, so that the calibration process can quickly stabilize the pressure and ultimately improve the calibration accuracy.

[0131] The abnormal situation handling method is as follows: When equipment malfunctions, if the pressure of water pump 221 drops suddenly, immediately shut down water pump 221 and check the liquid level in storage tank 21 and impeller; if the commutator 28 fails to switch, manually switch the position of the commutator 28 guide assembly, and record the fault time at the same time. The calibration data should be recorded starting from the time the manual switching stabilizes.

[0132] When the fluid flow is abnormal, if the fluid flow velocity suddenly increases, reduce the opening of the compensation valve 222 until the fluid flow velocity returns to the target range.

[0133] If data anomalies occur, and a single set of weighing data changes abruptly, discard that set of data. If three consecutive sets of data change abruptly, pause calibration and check whether the weighing structure 42 is affected by vibration. If the flow exceeds the stable range and the adjustment of the compensation valve 222 is ineffective, check whether the guide pipe 2612 of the regulating structure 26 is blocked.

[0134] By constructing a three-level pressure monitoring system that includes the source, middle section, and target, the pressure transmission chain can be established to achieve segmented quantification of pipeline pressure loss, providing data support for more accurate calibration and solving the problem of the one-sidedness of traditional single-point monitoring.

[0135] Through the dual-loop control logic of compensation regulation and basic regulation, the pressure compensation valve 222 prioritizes stabilizing the pressure near the flow meter, and the water pump 221 optimizes the overall pressure output.

[0136] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A calibration device for a metal tube float flowmeter, characterized in that: Including the workbench (1); Liquid supply assembly (2) is disposed on one side of the workbench (1); The workbench (1) is provided with a metal tube float flowmeter (5), a bypass assembly (3), and a weighing assembly (4) in sequence at the middle position. The liquid supply assembly (2) includes a multi-level monitoring module composed of a first sensor (24) and a second sensor (29) and a liquid supply mechanism (22). One end of the liquid supply mechanism (22) is connected to a first tube, and an adjustment structure (26) is provided on one side of the first tube. The adjustment structure (26) includes a first connecting pipe (264), an adjusting pipe (261), and a second connecting pipe (263) in sequence. An adjusting plate (262) is provided inside the second connecting pipe (263). The adjusting pipe (261) and the adjusting plate (262) are used to cooperate to achieve stable flow of liquid. The liquid supply mechanism (22) includes a fluid drive module consisting of a water pump (221) and a pressure compensation module consisting of a compensation valve (222); The first sensor (24) is located in the middle section of the pipeline between the regulating plate (262) and the water pump (221), the second sensor (29) is installed directly below the metal tube float flow meter (5), and the compensation valve (222) is located in the outlet pipeline of the water pump (221). The compensation valve (222) is used to compensate for pipeline pressure loss. The liquid is driven by a water pump (221) and flows sequentially through a compensation valve (222), a first sensor (24), a second sensor (29), and a metal tube float flow meter (5). The water pump (221) has a built-in pressure sensor. The pressure sensor is used to collect the initial pressure P0 at the output end of the water pump (221). The first sensor (24) is used to collect the pressure P1 in the middle section of the pipeline. The second sensor (29) is used to collect the pressure P2 in the target area of ​​the flow meter. It also includes a control module, which is configured to be electrically connected to the built-in pressure sensor of the water pump (221), the first sensor (24), the second sensor (29), the compensation valve (222) and the water pump (221) respectively, for receiving P0, P1, P2 and executing pressure regulation logic; The control module includes a data processing unit, a compensation and adjustment unit, and a basic adjustment unit; The data processing unit is used to calculate the first pressure loss difference. Difference between the second pressure loss ; The compensation adjustment unit is used to adjust according to The fluctuation range controls the opening degree of the compensation valve (222); The basic adjustment unit is used to adjust according to And P2 adjusts the output frequency of the water pump (221).

2. The calibration device for a metal tube float flowmeter according to claim 1, characterized in that: The liquid supply assembly (2) also includes a liquid storage tank (21), which is connected to the liquid supply mechanism (22). A second pipe (25) is provided at the middle position between the first pipe and the adjustment structure (26). The two ends of the second pipe (25) are connected to the adjustment structure (26) and the liquid supply mechanism (22) respectively.

3. A calibration device for a metal tube float flowmeter according to claim 2, characterized in that: The metal tube float flowmeter (5) is positioned above the adjustment structure (26), and a third tube body (27) is positioned above the metal tube float flowmeter (5). The adjustment structure (26), the metal tube float flowmeter (5), and the third tube body (27) are connected in sequence.

4. A calibration device for a metal tube float flowmeter according to claim 3, characterized in that: A commutator (28) is provided on one side of the third tube (27), and the third tube (27) is connected to the commutator (28). The bypass component (3) is located below the commutator (28), and the weighing component (4) is located on one side of the commutator (28). The bypass component (3) and the weighing component (4) are respectively connected to the commutator (28).

5. A calibration device for a metal tube float flowmeter according to claim 2, characterized in that: The first connecting pipe (264) is connected to the second pipe body (25), the adjusting pipe (261) is connected to the first connecting pipe (264) through a flange, and a second connecting pipe (263) is provided above the adjusting pipe (261), and the second connecting pipe (263) is connected to the adjusting pipe (261) through a flange.

6. A calibration device for a metal tube float flowmeter according to claim 5, characterized in that: The regulating plate (262) is located inside the second connecting pipe (263). An installation pipe is located above the second connecting pipe (263). The two ends of the installation pipe are connected to the second connecting pipe (263) and the metal tube float flow meter (5), respectively. The second sensor (29) is located outside the installation pipe. The second sensor (29) is used to measure the pressure of the liquid at the inlet end of the metal tube float flow meter (5).

7. A calibration device for a metal tube float flowmeter according to claim 5, characterized in that: The adjusting tube (261) includes a pipe (2611), the pipe (2611) is shaped as a hollow cylindrical structure, and the inside of the pipe (2611) is provided with a plurality of guide pipes (2612) arranged in sequence and evenly, the guide pipes (2612) being shaped as hexagonal structures.

8. A calibration device for a metal tube float flowmeter according to claim 5, characterized in that: The regulating plate (262) includes a plate body (2621), and a plurality of through holes (2622) are provided on the plate body (2621). The through holes (2622) are shaped as a conical structure. The side with the larger diameter of the conical structure is close to the regulating tube (261), and the side with the smaller diameter of the conical structure of the through hole (2622) is close to the metal tube float flowmeter (5). The second sensor (29) is located at the middle position between the through hole (2622) and the metal tube float flowmeter (5).

9. A calibration device for a metal tube float flowmeter according to claim 4, characterized in that: The bypass assembly (3) includes a collection tank (31), which is hollow inside. An output pipe (33) is connected to the bottom of the collection tank (31). A first switching valve (32) is provided at the bottom of the output pipe (33). An input pipe (34) is provided at the top of the collection tank (31). The input pipe (34) is connected to the commutator (28).

10. A calibration device for a metal tube float flowmeter according to claim 4, characterized in that: The weighing assembly (4) includes a standard weighing container (41), an inlet pipe (44) is provided on one side of the standard weighing container (41), the inlet pipe (44) is connected to the commutator (28), a weighing structure (42) is provided at the bottom of the standard weighing container (41), the weighing structure (42) has a built-in weighing sensor, and a second switching valve (43) is provided on the side of the standard weighing container (41) away from the inlet pipe (44).

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