Differential pressure compensation correction system for precession flow meter

Abstract

The invention relates to the technical field of precession flow meters, and particularly discloses a differential pressure compensation correction system for a precession flow meter, which comprises a meter body and a differential pressure correction system, and the differential pressure correction system is arranged in the meter body. Through the design of integrating the two pressure tapping holes and the first and second servo-driven sealing movable plates, the system is endowed with efficient and flexible maintenance characteristics, the requirement of quickly replacing the flow guide rings is met, the accuracy and high efficiency of central pressure tapping are also ensured, the three flow guide rings distributed on the adjusting rod are matched with the thin film pressure sensor, the central pressure tapping mode is adopted, and the working efficiency is improved. Compared with the traditional wall surface pressure tapping, the pressure signal of the fluid center can be more accurately obtained, the adverse effect of non-uniform flow and vortex of the fluid near the pipeline wall on the measurement result is reduced, the measurement precision is remarkably improved, the requirements under the wider flow and pressure conditions are met, meanwhile, the pressure loss is effectively controlled, and the measurement accuracy is improved. And the measurement efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of swirl flowmeters, in particular to a differential pressure compensation correction system for swirl flowmeters. Background Art

[0002] The existing swirl flowmeter mainly has the limitation of pressure taking method and the problem of simple differential pressure correction method. The swirl flowmeter of the prior art mostly adopts the pipe wall pressure taking method, that is, taking pressure from the vicinity of the pipe wall, and has the following defects: 1. The measurement accuracy is affected: due to factors such as the flow unevenness and eddy current of the fluid near the pipe wall, the accuracy of the pressure taking is affected, resulting in insufficient measurement accuracy; 2. The pressure loss is large: when the fluid passes through the pressure taking structure of the pipe wall, a certain pressure loss will be generated, which will reduce the measurement efficiency and energy utilization rate. It is impossible to effectively handle the influence of fluid temperature and pressure changes on the measurement results, lack of real-time monitoring and analysis of fluid properties, unable to adjust the differential pressure correction parameters in real time according to fluid changes, unable to meet the accuracy requirements for high flow rate and high pressure fluid measurement needs, lack of real-time monitoring of fluid state and the function of differential pressure correction based on this.

[0003] Therefore, the present invention proposes a new type of swirl flowmeter using central pressure sampling and intelligent differential pressure correction to solve the above problems, improve the measurement accuracy and reliability of the flowmeter, and enhance its ability to adapt to various fluid conditions. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a differential pressure compensation correction system for a swirl flowmeter, in order to solve the above-mentioned technical defects.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a differential pressure compensation correction system for a swirl flowmeter, comprising a meter body and a differential pressure correction system, the differential pressure correction system is arranged inside the meter body, and vortex generators and straightening blades are arranged on the left and right sides of the meter body, respectively, a fixing frame is fixedly arranged in the middle of the surface of the meter body, pressure taking holes are arranged on the front and rear sides of the meter body, and the two pressure taking holes are located on the same central axis, an adjusting rod is movably arranged inside the meter body, and three guide rings are installed on the surface of the adjusting rod, a thin film pressure sensor is fixedly arranged on the top of the inner wall of the guide ring, the guide ring is arranged horizontally inside the meter body, and the inside of the guide ring is arranged as a through hole, the two ends of the guide ring are respectively level with the two ends of the meter body, and the two ends of the guide ring are arranged with arc chamfers;

[0006] The differential pressure correction system includes a fluid data monitoring module, a flow differential pressure correction analysis module and a differential pressure compensation correction evaluation module;

[0007] The fluid data monitoring module is used to monitor the fluid parameters inside the flow meter in real time and obtain the fluid parameters inside the flow meter corresponding to each monitoring period;

[0008] The flow differential pressure correction analysis module performs differential pressure correction analysis and calculation based on the flow rate and the fluid center pressure value of the fluid to obtain the flow differential pressure compensation correction signal of the fluid inside the flow meter. The specific calculation and analysis method is as follows:

[0009] Obtain the fluid center pressure value at the center position of the flow meter corresponding to each monitoring period and the fluid discharge pressure value of the flow meter corresponding to each monitoring period, calculate the difference between the two, take its absolute value, and record it as the flow differential pressure correction judgment coefficient of the flow meter corresponding to each monitoring period;

[0010] Obtain the average flow velocity and fluid density inside the flow meter corresponding to each monitoring period, recorded as ρ and v respectively, according to the formula 1 / 2*(ρv 2 ) Calculate and obtain the flow differential pressure correction comparison coefficient of the flow meter corresponding to each monitoring period;

[0011] By performing differential calculation on the flow differential pressure correction judgment coefficient corresponding to each monitoring period of the flow meter and the flow differential pressure correction comparison coefficient corresponding to each monitoring period of the flow meter, taking the absolute value of the calculation result, if the absolute value is greater than 0.65, it means that the flow differential pressure of the flow meter corresponding to the monitoring period needs differential pressure compensation correction processing, and a flow differential pressure compensation correction signal is generated to compensate and correct the fluid differential pressure inside the flow meter; otherwise, it means that the flow differential pressure of the flow meter corresponding to the monitoring period does not need differential pressure compensation correction processing, and a flow differential pressure normal signal is generated, and no operation is required;

[0012] The differential pressure compensation correction evaluation module performs differential pressure correction analysis and calculation based on the temperature value and the center pressure value of the fluid to obtain the differential pressure correction coefficient of the fluid inside the flow meter.

[0013] Furthermore, the three guide rings divide the regulating rod into four sections as a whole, and the lengths of the four sections are the same as the radius of the inner ring of the meter body.

[0014] Furthermore, the guide ring is made of polytetrafluoroethylene, and the surface of the guide ring is smoothed.

[0015] Furthermore, two second sealing movable plates are movably provided on the inner sides of the two pressure-taking holes through a micro-electric cylinder, and two first sealing movable plates are movably provided on the outer sides of the two pressure-taking holes, servo electric cylinders are fixedly provided on the left and right sides of the fixed frame, and the driving ends of the two servo electric cylinders are respectively fixedly connected to one side of the two first sealing movable plates, and sealing grooves are provided on the opposite sides of the two second sealing movable plates and the two first sealing movable plates, and the inner walls of the sealing grooves are in contact with the surface of the adjusting rod.

[0016] Furthermore, a replacement frame is fixedly provided on the front and rear sides of the fixed frame, and a sealing frame cover is movably provided on the top of the two replacement frames, a sleeve is fixedly provided on one side of the two replacement frames, and both ends of the adjusting rod extend to the inside of the two sleeves respectively, a rotating ring is rotatably provided at the front end of the sleeve located on the front side, and an adjusting screw is fixedly provided at one end of the rotating ring, a threaded hole matching the adjusting screw is provided inside the front end of the adjusting rod, and one end of the adjusting screw is threadedly connected to the front end of the adjusting rod, wherein the surface of the adjusting rod is slidably provided inside the sleeve.

[0017] Furthermore, the fluid parameters inside the flow meter are monitored in real time. The specific monitoring method is as follows:

[0018] Directly obtain the fluid category inside the flow meter from the database, obtain the fluid density inside the flow meter according to the fluid category, obtain the flow value inside the flow meter corresponding to each monitoring period by directly obtaining the fluid flow value inside the flow meter, and obtain the average flow velocity inside the flow meter corresponding to each monitoring period by comparing the flow value and the cross-sectional area of ​​the pipe inside the flow meter;

[0019] The flow guide disposed in the middle of the meter body cooperates with the thin film pressure sensor inside it to take the pressure at the center of the fluid, and obtain the center pressure value of the fluid at the center of the flow meter corresponding to each monitoring period. At the same time, the pressure sensor disposed at the discharge end of the flow meter monitors the fluid pressure at the discharge end of the flow meter in real time, and obtains the fluid discharge pressure value of the flow meter corresponding to each monitoring period.

[0020] The temperature of the fluid corresponding to each monitoring period is monitored in real time by a temperature sensor arranged inside the flow meter, so as to obtain the temperature value of the fluid inside the flow meter corresponding to each monitoring period.

[0021] Furthermore, the differential pressure correction analysis and calculation is performed based on the temperature value of the fluid and the center pressure value of the fluid. The specific calculation and analysis method is as follows:

[0022] Obtain the initial temperature value of the fluid inside the flow meter, recorded as T1, and obtain the corrected temperature value of the fluid inside the flow meter, recorded as T2;

[0023] Obtain the initial pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P1, and obtain the corrected pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P2;

[0024] By performing isentropic expansion on the fluid inside the flow meter, measuring the changes in pressure, temperature and volume of the fluid during the isentropic process, and combining the thermodynamic relationship, the isentropic index of the fluid inside the flow meter is calculated, which is recorded as γ;

[0025] According to the formula K = (P2 / P1) 1 / γ *(T1 / T2) calculates the differential pressure correction coefficient of the fluid inside the flowmeter. If the value of the differential pressure correction coefficient of the fluid inside the flowmeter is equal to 1, it means that the actual measured differential pressure value is close to the theoretically calculated differential pressure value, and the measurement result of the swirl flowmeter may be more accurate, and no large-scale differential pressure compensation correction is required. When the value of the differential pressure correction coefficient of the fluid inside the flowmeter is greater than or less than 1, it means that the actual measured differential pressure value is larger than the theoretically calculated value, there is a measurement error, and the film pressure sensor needs to be repaired and maintained.

[0026] The beneficial effects achieved by the present invention using the above structure are as follows:

[0027] 1. The present invention integrates two pressure-taking holes and the first and second sealing movable plates driven by a servo, giving the system efficient and flexible maintenance characteristics, which not only meets the needs of quickly replacing the guide ring, but also ensures the accuracy and efficiency of the central pressure taking. The three guide rings distributed on the adjusting rod cooperate with the thin film pressure sensor to adopt a central pressure taking method. Compared with the traditional wall pressure taking, it can more accurately obtain the pressure signal of the fluid center, reduce the adverse effects of the uneven flow and eddy current of the fluid near the pipe wall on the measurement results, significantly improve the measurement accuracy, and adapt to the needs under a wider range of flow and pressure conditions. At the same time, the pressure loss is effectively controlled, further improving the measurement efficiency.

[0028] 2. The present invention further optimizes the calculation of the flow meter through the differential pressure correction system, accurately identifies and handles the flow differential pressure problem, ensures the reliability of the flow meter under different conditions, and ensures the accurate capture of fluid parameters through real-time monitoring and data processing technology. Through the built-in temperature sensor and pressure sensor, the system can obtain real-time temperature value and center pressure value, and then use relevant parameters in the flow differential pressure analysis module to calculate and accurately adjust the flow differential pressure, ensuring the accuracy of the measurement data.

[0029] 3. The differential pressure compensation correction evaluation module in the present invention calculates the differential pressure correction coefficient of the fluid through the isentropic process model to achieve dynamic correction, further improving the adaptability and effectiveness of the system and ensuring accurate and consistent measurement results. In summary, the swirl flowmeter proposed in this application can measure flow more accurately, efficiently and stably, and is especially suitable for high flow rate and high pressure fluid measurement. It also has excellent maintainability and adaptability, which is crucial for industrial automation and energy fields, and greatly improves the cost-effectiveness and feasibility of flow measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of a meter body and a fixing frame structure according to an embodiment of the present invention;

[0032] Figure 2 It is a schematic diagram of the structure of the meter body, the guide ring and the thin film pressure sensor according to an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the fixing frame and the second sealing movable plate according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the first sealing movable plate, the pressure taking hole and the second sealing movable plate according to an embodiment of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the adjusting rod, the guide ring and the thin film pressure sensor according to an embodiment of the present invention;

[0036] Figure 6 The figure is a principle block diagram of a differential pressure correction system according to an embodiment of the present invention.

[0037] In the figure, 1. meter body; 2. fixing frame; 3. adjusting rod; 4. guide ring; 5. film pressure sensor; 6. sleeve; 7. replacement frame; 8. sealing frame cover; 9. pressure taking hole; 10. first sealing movable plate; 11. second sealing movable plate; 12. servo electric cylinder; 13. sealing groove; 14. rotating ring; 15. adjusting screw. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] Embodiment 1:

[0041] See also Figures 1 to 6 As shown, a differential pressure compensation correction system for a swirl flowmeter includes a meter body 1 and a differential pressure correction system, wherein the differential pressure correction system is arranged inside the meter body 1, and vortex generators and rectifying blades are arranged on the left and right sides of the meter body 1, respectively, a fixing frame 2 is fixedly arranged in the middle of the surface of the meter body 1, pressure taking holes 9 are arranged on the front and rear sides of the meter body 1, and the two pressure taking holes 9 are located on the same central axis, an adjusting rod 3 is movably arranged inside the meter body 1, and three guide rings 4 are installed on the surface of the adjusting rod 3, and a thin film pressure sensor 5 is fixedly arranged on the top of the inner wall of the guide ring 4, wherein the three guide rings 4 divide the adjusting rod 3 as a whole into four sections, and the lengths of the four sections are the same as the meter body 1. The inner ring radius size is the same, the guide ring 4 is arranged horizontally inside the meter body 1, and the inside of the guide ring 4 is arranged as a through hole, the two ends of the guide ring 4 are respectively horizontal with the two ends of the meter body 1, and the two ends of the guide ring 4 are arranged with arc chamfers, wherein the material of the guide ring 4 is polytetrafluoroethylene material, and the surface of the guide ring 4 is smoothed. Since the polytetrafluoroethylene material has good self-lubricating properties and low friction coefficient, the surface roughness of the guide ring 4 can be reduced after smoothing, and the resistance of the fluid on the surface of the guide ring 4 and the generation of eddy currents can be reduced, thereby greatly reducing the influence of the guide ring 4 on the fluid flow, and improving the performance and reliability of the flow meter.

[0042] Further, two second sealing movable plates 11 are movably provided on the inner sides of the two pressure-taking holes 9 through micro-electric cylinders, and two first sealing movable plates 10 are movably provided on the outer sides of the two pressure-taking holes 9, servo electric cylinders 12 are fixedly provided on the left and right sides of the fixing frame 2, and the driving ends of the two servo electric cylinders 12 are respectively fixedly connected to one side of the two first sealing movable plates 10, and the two second sealing movable plates 11 and the opposite side of the two first sealing movable plates 10 are provided with sealing grooves 13, and the inner wall of the sealing groove 13 is in contact with the surface of the adjusting rod 3, and the two second sealing movable plates 11 are controlled by the driving ends of the two micro-electric cylinders to be moved inside the pressure-taking holes 9. The two first sealing movable plates 10 are controlled to slide relative to each other by the driving ends of the two servo electric cylinders 12, thereby closing the outside of the pressure taking hole 9. The second sealing movable plate 11 and the first sealing movable plate 10 are used to control the sealing of the inside and outside of the pressure taking hole 9, so that the guide ring 4 inside the meter body 1 can be flexibly replaced and maintained, and the three guide rings 4 are distributed on the adjusting rod 3. When replacing and maintaining one of the guide rings 4, the central pressure taking of the fluid inside the meter body 1 can also be performed through the other guide ring 4, without affecting the pressure taking efficiency of the fluid.

[0043] Furthermore, a replacement frame 7 is fixedly provided on the front and rear sides of the fixed frame 2, and a sealing frame cover 8 is movably provided on the top of the two replacement frames 7, a sleeve 6 is fixedly provided on one side of the two replacement frames 7, and the two ends of the adjusting rod 3 extend to the inside of the two sleeves 6 respectively, a rotating ring 14 is rotatably provided at the front end of the sleeve 6 located on the front side, and an adjusting screw 15 is fixedly provided at one end of the rotating ring 14, a threaded hole matching the adjusting screw 15 is provided inside the front end of the adjusting rod 3, and one end of the adjusting screw 15 is threadedly connected to the front end of the adjusting rod 3, wherein the surface of the adjusting rod 3 is slidably provided inside the sleeve 6.

[0044] It should be noted that, by setting an adjusting rod 3 through the front and back of the center position inside the meter body 1, and fixing three guide rings 4 on the surface of the adjusting rod 3, when the pressure measurement operation of the fluid inside the meter body 1 is performed, the guide ring 4 in the middle of the surface of the adjusting rod 3 is used in conjunction with the thin film pressure sensor 5 inside it to measure the pressure of the center of the fluid. Compared with the pipe wall pressure measurement used in the prior art when measuring the pressure of the fluid, the present application changes the pressure measurement method of the fluid, and uses the center pressure measurement method to more accurately obtain the pressure signal of the center of the fluid, thereby reducing the flow unevenness and eddy current of the fluid near the pipe wall. The influence of the measurement results, compared with the front and rear wall pressure taking method, the central pressure taking method can provide a more stable and accurate pressure signal, thereby improving the measurement accuracy of the flowmeter. In addition, the central pressure taking method can better adapt to the measurement requirements under different flow and pressure conditions. Since the pressure signal of the center of the fluid can be accurately obtained, the flowmeter can maintain a high measurement accuracy in a larger flow range. For some high-flow rate and high-pressure fluid measurement occasions, the central pressure taking method has better adaptability; at the same time, in the front and rear wall pressure taking method, the guide ring 4 is located near the pipe wall, and the fluid will produce a certain pressure loss when passing through the guide ring 4. In the central pressure taking method, the guide ring 4 is located at the center of the fluid, and the pressure loss of the fluid when passing through the guide ring 4 is small. Reducing the pressure loss can improve the measurement efficiency of the flowmeter and reduce energy consumption. In addition, in the central pressure taking method, the pressure sensor is installed at the center of the flowmeter, which is less affected by external interference. At the same time, due to the high processing accuracy and sealing performance of the pressure taking hole, the possibility of fluid leakage and external impurities entering is reduced.

[0045] It should also be noted that by arranging three guide rings 4 on the surface of the adjusting rod 3, when performing the center pressure taking operation, the second sealing movable plate 11 and the first sealing movable plate 10 inside the front and rear side pressure taking holes 9 cooperate with the sealing groove 13 to achieve the clamping, sealing and positioning of the front and rear ends of the adjusting rod 3, thereby being able to ensure to the greatest extent that the guide ring 4 at the center position inside the meter body 1 can withstand the pressure and impact force of the fluid when taking pressure at the center of the fluid, thereby ensuring the stability of the guide ring 4 at the center position during the pressure taking operation, improving the performance and reliability of the flowmeter, and the rotary flowmeter can measure flow more accurately, efficiently and stably, and is especially suitable for high flow rate and high pressure fluid measurement. It also has excellent maintainability and adaptability, which is crucial to the industrial automation and energy fields, and greatly improves the cost-effectiveness and feasibility of flow measurement.

[0046] Embodiment 2:

[0047] Further, the differential pressure correction system includes a fluid data monitoring module, a flow differential pressure correction analysis module and a differential pressure compensation correction evaluation module;

[0048] The fluid data monitoring module is used to monitor the fluid parameters inside the flow meter in real time and obtain the fluid parameters inside the flow meter corresponding to each monitoring period. The specific monitoring method is as follows:

[0049] Directly obtain the fluid category inside the flow meter from the database, obtain the fluid density inside the flow meter according to the fluid category, obtain the flow value inside the flow meter corresponding to each monitoring period by directly obtaining the fluid flow value inside the flow meter, and obtain the average flow velocity inside the flow meter corresponding to each monitoring period by comparing the flow value and the cross-sectional area of ​​the pipe inside the flow meter;

[0050] The flow guide 4 arranged in the middle of the meter body 1 cooperates with the thin film pressure sensor 5 inside it to take pressure at the center position of the fluid, so as to obtain the center pressure value of the fluid at the center position inside the flow meter corresponding to each monitoring period. At the same time, the pressure sensor arranged at the discharge end of the flow meter is used to monitor the fluid pressure at the discharge end of the flow meter in real time, so as to obtain the fluid discharge pressure value of the flow meter corresponding to each monitoring period.

[0051] The temperature of the fluid corresponding to each monitoring period is monitored in real time by a temperature sensor arranged inside the flow meter, so as to obtain the temperature value of the fluid inside the flow meter corresponding to each monitoring period.

[0052] The flow differential pressure correction analysis module performs differential pressure correction analysis and calculation based on the flow rate and the fluid center pressure value of the fluid to obtain the flow differential pressure compensation correction signal of the fluid inside the flow meter. The specific calculation and analysis method is as follows:

[0053] Obtain the fluid center pressure value at the center position of the flow meter corresponding to each monitoring period and the fluid discharge pressure value of the flow meter corresponding to each monitoring period, calculate the difference between the two, take its absolute value, and record it as the flow differential pressure correction judgment coefficient of the flow meter corresponding to each monitoring period;

[0054] Obtain the average flow velocity and fluid density inside the flow meter corresponding to each monitoring period, recorded as ρ and v respectively, according to the formula 1 / 2*(ρv 2 ) Calculate and obtain the flow differential pressure correction comparison coefficient of the flow meter corresponding to each monitoring period;

[0055] By performing differential calculation on the flow differential pressure correction judgment coefficient corresponding to each monitoring period of the flow meter and the flow differential pressure correction comparison coefficient corresponding to each monitoring period of the flow meter, the absolute value of the calculation result is taken. If the absolute value is greater than 0.65, it means that the flow differential pressure of the flow meter corresponding to the monitoring period requires differential pressure compensation correction processing, and a flow differential pressure compensation correction signal is generated to compensate and correct the fluid differential pressure inside the flow meter. Otherwise, it means that the flow differential pressure of the flow meter corresponding to the monitoring period does not require differential pressure compensation correction processing, and a normal flow differential pressure signal is generated, and no operation is required.

[0056] The differential pressure compensation correction evaluation module performs differential pressure correction analysis and calculation based on the temperature value and center pressure value of the fluid to obtain the differential pressure correction coefficient of the fluid inside the flow meter. The specific calculation and analysis method is as follows:

[0057] Obtain the initial temperature value of the fluid inside the flow meter, recorded as T1, and obtain the corrected temperature value of the fluid inside the flow meter, recorded as T2;

[0058] Obtain the initial pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P1, and obtain the corrected pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P2;

[0059] By performing isentropic expansion on the fluid inside the flow meter, measuring the changes in pressure, temperature and volume of the fluid during the isentropic process, and combining the thermodynamic relationship, the isentropic index of the fluid inside the flow meter is calculated, which is recorded as γ;

[0060] According to the formula K = (P2 / P1) 1 / γ*(T1 / T2) calculates the differential pressure correction coefficient of the fluid inside the flowmeter. If the value of the differential pressure correction coefficient of the fluid inside the flowmeter is equal to 1, it means that the actual measured differential pressure value is close to the theoretically calculated differential pressure value, and the measurement result of the rotary flowmeter may be relatively accurate, and there is no need for large-scale differential pressure compensation correction. When the value of the differential pressure correction coefficient of the fluid inside the flowmeter is greater than or less than 1, it means that the actual measured differential pressure value is larger than the theoretically calculated value, there is a measurement error, and the diaphragm pressure sensor 5 needs to be inspected and maintained.

[0061] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0062] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0063] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0064] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A differential pressure compensation correction system for a swirl flowmeter, comprising a meter body (1) and a differential pressure correction system, wherein the differential pressure correction system is arranged inside the meter body (1), and the differential pressure correction system comprises a fluid data monitoring module, a flow differential pressure correction analysis module and a differential pressure compensation correction evaluation module; characterized in that: The fluid data monitoring module is used to monitor the fluid parameters inside the flow meter in real time, and obtain the fluid parameters inside the flow meter corresponding to each monitoring period; The flow differential pressure correction analysis module performs differential pressure correction analysis and calculation based on the flow rate and the fluid center pressure value of the fluid to obtain the flow differential pressure compensation correction signal of the fluid inside the flow meter. The specific calculation and analysis method is as follows: obtain the fluid center pressure value at the center position of the flow meter corresponding to each monitoring period and the fluid discharge pressure value of the flow meter corresponding to each monitoring period, calculate the difference between the two, take its absolute value, and record it as the flow differential pressure correction judgment coefficient of the flow meter corresponding to each monitoring period; obtain the average flow velocity and fluid density inside the flow meter corresponding to each monitoring period, record them as ρ and v respectively, according to the formula 1 / 2*(ρv 2 ) calculate the flow differential pressure correction comparison coefficient of the flow meter corresponding to each monitoring period; perform difference calculation on the flow differential pressure correction judgment coefficient of the flow meter corresponding to each monitoring period and the flow differential pressure correction comparison coefficient of the flow meter corresponding to each monitoring period, take the absolute value of the calculation result, if the absolute value is greater than 0.65, it means that the flow differential pressure of the flow meter corresponding to the monitoring period needs differential pressure compensation correction processing, generate a flow differential pressure compensation correction signal, and perform compensation correction processing on the fluid differential pressure inside the flow meter; The differential pressure compensation correction evaluation module performs differential pressure correction analysis and calculation based on the temperature value and the center pressure value of the fluid to obtain the differential pressure correction coefficient of the fluid inside the flow meter.

2. A differential pressure compensation correction system for a swirl flowmeter according to claim 1, characterized in that: The left and right sides of the meter body (1) are respectively provided with a vortex generator and a rectifying blade. A fixing frame (2) is fixedly provided in the middle of the surface of the meter body (1). Pressure holes (9) are provided on the front and rear sides of the meter body (1), and the two pressure holes (9) are located on the same central axis. An adjusting rod (3) is movably provided inside the meter body (1), and three guide rings (4) are installed on the surface of the adjusting rod (3). A thin film pressure sensor (5) is fixedly provided on the top of the inner wall of the guide ring (4). The guide ring (4) is arranged horizontally inside the meter body (1), and the inside of the guide ring (4) is provided with a through hole. The two ends of the guide ring (4) are respectively parallel to the two ends of the meter body (1), and the two ends of the guide ring (4) are provided with arc chamfers. The three guide rings (4) divide the adjusting rod (3) into four sections as a whole, and the lengths of the four sections are the same as the radius of the inner ring of the meter body (1).

3. A differential pressure compensation correction system for a swirl flowmeter according to claim 2, characterized in that: The guide ring (4) is made of polytetrafluoroethylene material, and the surface of the guide ring (4) is smoothed.

4. A differential pressure compensation correction system for a swirl flowmeter according to claim 3, characterized in that: Two second sealing movable plates (11) are movably provided on the inner sides of the two pressure-taking holes (9) through a micro-electric cylinder, and two first sealing movable plates (10) are movably provided on the outer sides of the two pressure-taking holes (9). A servo electric cylinder (12) is fixedly provided on the left and right sides of the fixing frame (2), and the driving ends of the two servo electric cylinders (12) are respectively fixedly connected to one side of the two first sealing movable plates (10). A sealing groove (13) is provided on the opposite side of the two second sealing movable plates (11) and the two first sealing movable plates (10), and the inner wall of the sealing groove (13) is in contact with the surface of the adjusting rod (3).

5. A differential pressure compensation correction system for a swirl flowmeter according to claim 4, characterized in that: A replacement frame (7) is fixedly provided on the front and rear sides of the fixing frame (2), and a sealing frame cover (8) is movably provided on the top of the two replacement frames (7). A sleeve (6) is fixedly provided on one side of the two replacement frames (7), and the two ends of the adjustment rod (3) extend to the inside of the two sleeves (6) respectively. A rotating ring (14) is rotatably provided at the front end of the sleeve (6) located on the front side, and an adjusting screw rod (15) is fixedly provided at one end of the rotating ring (14). A threaded hole matching the adjusting screw rod (15) is provided inside the front end of the adjusting rod (3), and one end of the adjusting screw rod (15) is threadedly connected to the inside of the front end of the adjusting rod (3), wherein the surface of the adjusting rod (3) is slidably provided inside the sleeve (6).

6. The differential pressure compensation correction system for a swirl flowmeter according to claim 1, characterized in that: The fluid parameters inside the flow meter are monitored in real time. The specific monitoring methods are as follows: Directly obtain the fluid category inside the flow meter from the database, obtain the fluid density inside the flow meter according to the fluid category, obtain the flow value inside the flow meter corresponding to each monitoring period by directly obtaining the fluid flow value inside the flow meter, and obtain the average flow velocity inside the flow meter corresponding to each monitoring period by comparing the flow value and the cross-sectional area of ​​the pipe inside the flow meter; The flow guide (4) arranged in the middle of the meter body (1) cooperates with the thin film pressure sensor (5) inside the flow guide (4) to measure the pressure at the center of the fluid, so as to obtain the center pressure value of the fluid at the center of the flow meter corresponding to each monitoring period, and at the same time, the pressure sensor arranged at the discharge end of the flow meter is used to monitor the fluid pressure at the discharge end of the flow meter in real time, so as to obtain the discharge pressure value of the fluid corresponding to each monitoring period of the flow meter; The temperature of the fluid corresponding to each monitoring period is monitored in real time by a temperature sensor arranged inside the flow meter, so as to obtain the temperature value of the fluid inside the flow meter corresponding to each monitoring period.

7. The differential pressure compensation correction system for a swirl flowmeter according to claim 1, characterized in that: The differential pressure correction analysis and calculation is performed based on the temperature value of the fluid and the center pressure value of the fluid. The specific calculation and analysis method is as follows: Obtain the initial temperature value of the fluid inside the flow meter, recorded as T1, and obtain the corrected temperature value of the fluid inside the flow meter, recorded as T2; Obtain the initial pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P1, and obtain the corrected pressure value of the fluid center at the center position of the flow meter corresponding to each monitoring period, recorded as P2; By performing isentropic expansion on the fluid inside the flow meter, measuring the changes in pressure, temperature and volume of the fluid during the isentropic process, and combining the thermodynamic relationship, the isentropic index of the fluid inside the flow meter is calculated, which is recorded as γ; According to the formula K = (P2 / P1) 1 / γ *(T1 / T2) calculates the differential pressure correction coefficient of the fluid inside the flow meter. If the value of the differential pressure correction coefficient of the fluid inside the flow meter is equal to 1, it means that the actual measured differential pressure value is close to the theoretical calculated differential pressure value, and the measurement result of the rotary flow meter may be relatively accurate, and there is no need for large-scale differential pressure compensation correction. When the value of the differential pressure correction coefficient of the fluid inside the flow meter is greater than or less than 1, it means that the actual measured differential pressure value is greater than the theoretical calculated value, there is a measurement error, and the film pressure sensor (5) needs to be repaired and maintained.

Images