A turbine mass flow meter

Abstract

The present invention discloses a turbine mass flowmeter, belonging to the field of flowmeters, comprising a tube body, wherein two groups of guides are arranged inside the tube body, the two groups of guides are symmetrically arranged, the guides are composed of a first guide plate and a guide column, the first guide plates are multiple groups and are distributed in an annular shape, the first guide plates are fixedly connected to the outer surface of the guide column, and one end of the first guide plate away from the guide column is fixedly connected to the inner wall of the tube body; a support column is arranged between the two groups of guide columns, and multiple groups of second guide plates are fixedly connected to the outer surface of the support column. The present invention can realize that two signal detectors work simultaneously, can verify each other, reduce the influence of a single interference factor on the measurement result, even if one detector is interfered, the other detector can still provide relatively accurate data, and the error caused by the interference can be further reduced through fusion processing, thereby improving the reliability and stability of the flowmeter.

Description

Technical Field

[0001] The present invention relates to the field of flowmeters, and more particularly to a turbine mass flowmeter. Background Art

[0002] The turbine flowmeter is a velocity flowmeter. Its working principle is based on the relationship that the rotational angular velocity of the impeller placed in the fluid is proportional to the fluid flow rate. The flow rate of the measured fluid is obtained by measuring the rotational angular velocity of the impeller, thereby calculating the flow value in the pipeline.

[0003] Existing turbine mass flowmeters generally only have one signal detector installed, which brings many problems in practical applications. First, when the flowmeter fails, since all the data comes from only this one detector, fault location becomes extremely difficult. If the detected data is abnormal, it is difficult to determine whether the fault occurs in the detector itself or other parts of the flowmeter, such as the mechanical structure of the impeller, the signal transmission line or the data processing module.

[0004] It is difficult for the data collected by one detector to achieve the function of mutual verification of data. When there is only one detector, there is a lack of such a mutual verification mechanism for data, which easily leads to the accumulation and propagation of measurement errors. In addition, the limitations of a single detector may also be affected by external environmental factors. For example, impurities, bubbles, temperature changes and vibrations in the fluid may interfere with the measurement results of the flow meter. A single detector cannot effectively identify and eliminate these external interference factors, further reducing the measurement accuracy of the flow meter. Summary of the invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a turbine mass flowmeter that can realize the simultaneous operation of two signal detectors and can verify each other, thereby reducing the influence of a single interference factor on the measurement result. Even if one detector is interfered with, the other detector can still provide relatively accurate data. The error caused by the interference can be further reduced through fusion processing, thereby improving the reliability and stability of the flowmeter.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A turbine mass flowmeter, comprising a tube body, wherein two groups of guides are arranged inside the tube body, the two groups of guides are symmetrically arranged, the guides are composed of a first guide plate and a guide column, the first guide plates are in multiple groups and are distributed in an annular shape, the first guide plates are fixedly connected to the outer surface of the guide column, and one end of the first guide plate away from the guide column is fixedly connected to the inner wall of the tube body;

[0008] A support column is arranged between the two groups of guide columns, and a plurality of groups of second guide plates are fixedly connected to the outer surface of the support column, and the second guide plates are distributed in an annular shape, and one end of the second guide plate away from the support column is fixedly connected to the inner wall of the tube body, and bearings are arranged at both left and right ends of the support column, and evenly distributed impeller blades are fixedly connected to the bearings, and the left and right ends of the bearings are fixedly connected to rotating shafts, and the rotating shafts are rotatably connected to the guide column and the support column respectively, and a signal detector is installed on the inner wall of the tube body at a position directly above the impeller blade, and the signal detector is used to collect data on the rotation speed of the impeller blade, and a connecting rod is fixedly connected to the upper end of the signal detector, and the end of the connecting rod away from the signal detector passes through the upper wall of the tube body and is fixedly connected to a control box, and a processing module and an output module are installed in the control box;

[0009] The processing module is used to pre-process the speed signal of the impeller blade to obtain two sets of pre-processed data; calculate the difference between the two sets of pre-processed data, multiply the dynamic factor by the difference to obtain a judgment value; when the judgment value is close to a preset threshold, start the early warning mode; merge the two sets of pre-processed data and calculate the actual flow in the pipe body;

[0010] The output module is used to output the results processed by the processing module.

[0011] Furthermore, the speed signal of the impeller blade is preprocessed to obtain two sets of preprocessed data, including:

[0012] The two groups of signal detectors respectively and independently collect the rotation speed signals of the impeller blades, and the collected rotation speed signals are sent to the analog-to-digital converter;

[0013] The analog-to-digital converter samples the analog signal and converts the analog value of each sampling point into a corresponding digital value;

[0014] The converted digital signal is transmitted to the processing module, and a new sampling point value is calculated based on the current and previous sampling points. In each iteration, the filter calculates a new filter value based on the previous sampling value and the current sampling value. The data after iterative filtering is the preprocessed data.

[0015] Further, the difference between the two sets of preprocessed data is calculated, and the dynamic factor is multiplied by the difference to obtain a judgment value, including:

[0016] The processing module calculates the difference between the two sets of pre-processed data. If the difference is zero, the fluid flows stably in the flow meter; if the difference is not zero, the fluid flows abnormally in the flow meter;

[0017] The dynamic factor is adjusted according to the detected non-steady flow characteristic parameters, which include the flow velocity, temperature, pressure in the pipe body, the roughness of the inner wall of the pipe body, the density and viscosity of the liquid. The dynamic factor is multiplied by the difference to obtain the judgment value.

[0018] Furthermore, when the judgment value is close to a preset threshold, the early warning mode is activated, including:

[0019] The judgment value is compared with a preset fixed threshold. If the judgment value is greater than the fixed threshold, it is determined that there is data anomaly, and there is a problem with one of the signal detectors, and the alarm mode is activated.

[0020] Furthermore, the two sets of preprocessed data are fused and calculated to obtain the actual flow in the pipe body, including:

[0021] The two sets of pre-processed data are fused to obtain the speed data;

[0022] The obtained fusion speed data is combined with the principles of fluid mechanics and the cross-sectional area of ​​the pipe body to establish a pipe body model of the flow rate in the pipe body;

[0023] According to the pipe body model, the actual flow rate in the pipe body is calculated.

[0024] Furthermore, a purification component is also provided at the left end of the tube body, and the purification component includes a first connecting tube, the first connecting tube is fixedly connected to the left end of the tube body, the left end of the first connecting tube is fixedly connected to a vertical pipe, a second connecting tube is fixedly connected to the left side surface of the vertical pipe near the upper end, a filter cartridge with upper and lower openings is installed inside the vertical pipe, the filter cartridge is arranged at the connection between the first connecting tube and the vertical pipe, annular plates are fixedly provided at the upper and lower ends of the filter cartridge, the edge position of the annular plate is fixedly connected to the inner wall of the vertical pipe, a gear is installed inside the first connecting tube, the gear is meshed with the outer cylindrical surface of the filter cartridge, a connecting shaft is fixedly connected at the center position of the lower end surface of the gear, and an impeller is fixedly connected to the lower end of the connecting shaft.

[0025] Furthermore, a liquid pressure sensor is installed on the inner wall of the upper end of the vertical pipe. The liquid pressure sensor is used to monitor the pressure data in the vertical pipe in real time. The liquid pressure sensor is electrically connected to the processing module. The processing module estimates the data collected by the signal detector based on the pressure data at the same time, compares the estimated data at the same time with the data actually collected by the signal detector at the same time, calculates the difference between the two, and compares the difference with a preset threshold value. If the difference is greater than the threshold value, it is judged that the filter cartridge is blocked. If the difference is less than the threshold value, it is judged that the filtration condition of the filter cartridge is normal.

[0026] Furthermore, a brush is provided on one side of the inner wall of the filter cartridge, the brush is used to clean the inner wall of the filter cartridge, the upper end of the brush is fixedly connected to the inner wall of the vertical tube, the lower end of the vertical tube is threadedly connected to a collecting tube, and the collecting tube is made of transparent material.

[0027] Furthermore, a support rod is fixedly connected to the inner wall of the vertical tube at a position above the collecting cylinder, and a sealing plate is provided at the upper end of the support rod, and the sealing plate is used to seal the openings of a group of annular plates at the lower end.

[0028] Furthermore, the upper end of the connecting shaft passes through the gear, the upper end wall of the first connecting tube and extends to the outside, the connecting shaft is rotatably connected to the upper end wall of the first connecting tube, the upper end of the connecting shaft is fixedly connected to a generator, a power supply battery is installed in the control box, and the generator is electrically connected to the power supply battery.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention collects impeller blade speed data through two signal detectors. Once the difference between the two sets of data is too large, it can quickly determine that one set of signal detectors is damaged. Compared with the traditional flow meter with only one signal detector, the troubleshooting time is greatly shortened and the timeliness of fault detection is improved. This allows maintenance personnel to determine the problem in the shortest time, repair or replace damaged parts in time, and reduce the losses caused by production interruption or measurement errors due to flow meter failure.

[0031] Since there are two sets of data for comparison, it is possible to more accurately determine whether the fault occurs in the signal detector itself or in other parts. If there is only one detector, it is difficult to determine the specific location of the problem when data abnormalities occur. The present invention can accurately locate the damaged signal detector by comparing the two sets of data and eliminating other possible factors, thereby improving the accuracy of fault detection.

[0032] The two signal detectors work simultaneously and can verify each other, reducing the impact of a single interference factor on the measurement results. Even if one detector is interfered with, the other detector can still provide relatively accurate data. Fusion processing can further reduce the error caused by interference and improve the reliability and stability of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 This is an appearance view of the overall structure of the present invention;

[0035] Figure 2 It is a cross-sectional view of the interior of the tube body of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the bearing of the present invention;

[0037] Figure 4 is a cross-sectional view of the interior of the purification component of the present invention;

[0038] Figure 5 It is a disassembled view of the purification component of the present invention;

[0039] Figure 6 This is a schematic diagram of the collection and output flow of the processing module of the present invention.

[0040] Description of the numbers in the figure:

[0041] 1. Tube body; 2. First guide plate; 3. Guide column; 4. Bearing; 5. Impeller blade; 6. Rotating shaft; 7. Second guide plate; 8. Support column; 9. Signal detector; 10. Connecting rod; 11. Control box; 12. First connecting pipe; 13. Vertical pipe; 14. Second connecting pipe; 15. Filter cartridge; 16. Ring plate; 17. Gear; 18. Connecting shaft; 19. Impeller; 20. Sealing plate; 21. Support rod; 22. Collecting cylinder; 23. Brush; 24. Generator; 25. Liquid pressure sensor. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0043] See also Figures 1 to 6 A turbine mass flowmeter comprises a tube body 1, two groups of guides are arranged inside the tube body 1, the two groups of guides are symmetrically arranged, the guides are composed of a first guide plate 2 and a guide column 3, the first guide plates 2 are multiple groups and are distributed in an annular shape, the first guide plates 2 are fixedly connected to the outer surface of the guide column 3, and one end of the first guide plate 2 away from the guide column 3 is fixedly connected to the inner wall of the tube body 1;

[0044] A support column 8 is arranged between the two groups of guide columns 3, and a plurality of groups of second guide plates 7 are fixedly connected to the outer surface of the support column 8, and the second guide plates 7 are distributed in an annular shape, and one end of the second guide plate 7 away from the support column 8 is fixedly connected to the inner wall of the tube body 1, and bearings 4 are arranged at both left and right ends of the support column 8, and evenly distributed impeller blades 5 are fixedly connected to the bearing 4, and the left and right ends of the bearing 4 are fixedly connected to a rotating shaft 6, and the rotating shaft 6 is rotatably connected to the guide column 3 and the support column 8 respectively, and a signal detector 9 is installed on the inner wall of the tube body 1 at a position directly above the impeller blade 5, and the signal detector 9 is used to collect data on the rotation speed of the impeller blade 5, and a connecting rod 10 is fixedly connected to the upper end of the signal detector 9, and the end of the connecting rod 10 away from the signal detector 9 passes through the upper wall of the tube body 1 and is fixedly connected to a control box 11, and a processing module and an output module are installed in the control box 11;

[0045] The processing module is used to pre-process the speed signal of the impeller blade 5 to obtain two sets of pre-processed data; calculate the difference between the two sets of pre-processed data, multiply the dynamic factor by the difference to obtain a judgment value; when the judgment value is close to a preset threshold, start the early warning mode; merge the two sets of pre-processed data and calculate the actual flow in the pipe body 1; the output module is used to output the results processed by the processing module.

[0046] The speed signal of the impeller blade 5 is preprocessed to obtain two sets of preprocessed data, including:

[0047] The two groups of signal detectors 9 respectively and independently collect the rotation speed signal of the impeller blade 5, and the collected rotation speed signal is sent to the analog-to-digital converter;

[0048] The analog-to-digital converter samples the analog signal and converts the analog value of each sampling point into a corresponding digital value;

[0049] The converted digital signal is transmitted to the processing module, and a new sampling point value is calculated based on the current and previous sampling points. In each iteration, the filter calculates a new filter value based on the previous sampling value and the current sampling value. The data after iterative filtering is the preprocessed data.

[0050] When in use, first connect the two ends of the tube body 1 to the pipeline of the liquid to be measured, and the liquid flows in from the left end of the tube body 1. When the liquid passes through the two sets of bearings 4, it will drive the corresponding impeller blades 5 to rotate. The faster the flow rate of the liquid per unit time, the faster the rotation speed of the impeller blades 5. The two sets of signal detectors 9 can independently collect the speed signals of the corresponding impeller blades 5, which can improve the reliability and accuracy of signal collection and reduce signal loss or errors caused by failure of a single detector. The analog speed signal of the collected speed signal is sent to the analog-to-digital converter, and the analog-to-digital converter samples the analog signal, that is, converts the continuous time signal into a discrete time signal, and the analog value of each sampling point is converted into a corresponding digital value. This sampling process can be regarded as the discretization of the signal in the time domain. The converted digital signal is transmitted to the processing module for filtering. The purpose of filtering is to remove noise and interference in the signal and retain useful speed information. The filter calculates the new sampling point value based on the current and previous sampling points. This usually involves iterative filtering algorithms, such as FIR (finite impulse response) filters or IIR (infinite impulse response) filters. In each iteration, the filter calculates a new filter value based on the previous sampling value and the current sampling value. :

[0051] ;

[0052] in, and are the orders of the feedforward and feedback parts, respectively, and are the coefficients of the filter; Indicates at time The input signal value, It is the index variable of the signal sample. Through iterative filtering, the noise components in the speed signal, such as mechanical vibration, electromagnetic interference, etc., can be effectively removed, thereby improving the signal-to-noise ratio of the signal. The filtering process can make the signal smoother and reduce the high-frequency jitter introduced during sampling or transmission, making the signal easier to analyze and process.

[0053] In a preferred embodiment of the present invention, the difference between the two sets of preprocessed data is calculated, and the dynamic factor is multiplied by the difference to obtain a judgment value, including:

[0054] The processing module calculates the difference between the two sets of pre-processed data. If the difference is zero, the fluid flows stably in the flow meter; if the difference is not zero, the fluid flows abnormally in the flow meter;

[0055] The dynamic factor is adjusted according to the detected non-steady flow characteristic parameters, which include the flow velocity, temperature, pressure in the pipe body 1, the roughness of the inner wall of the pipe body 1, the density and viscosity of the liquid. The dynamic factor is multiplied by the difference to obtain the judgment value.

[0056] The filter values ​​of the two groups of signal detectors 9 at the same time are subjected to difference processing to obtain the difference of the filter values ​​of the two groups of signal detectors 9. The difference is expressed as When the difference is zero, the speed signals of the impeller blade 5 collected by the two signal detectors 9 are completely consistent after preprocessing, indicating that when the fluid acts on the impeller blade 5 through two symmetrical deflectors, the effect on the impeller blade 5 is the same, that is, the fluid flows stably in the flow meter. When the difference is not zero, it means that at the same time point at the two detection positions, the effect of the fluid on the impeller blade 5 is different. This difference leads to different preprocessing data, which means that the fluid is in an abnormal flow state in the flow meter, and there may be turbulence, vortexes, or uneven fluid properties. The calculation of the dynamic factor introduces the characteristic parameters of the non-stable flow state, and the flow velocity in the pipe body 1 ,temperature ,pressure , the roughness of the inner wall of pipe body 1 , density of liquid and viscosity , the specific calculation formula of the dynamic factor is:

[0057] ;

[0058] in and is a weight factor used to balance the influence of the difference part and the non-stable flow characteristic parameter part on the dynamic factor. It is about flow rate ,temperature ,pressure The function is used to describe the influence of these parameters on the fluid flow stability. This function can be linear or nonlinear. Based on the fitting function of experimental data, according to the ideal gas state equation, it can be obtained that ,in is the ideal liquid constant, is the number of moles of liquid substance, and the dynamic factor and Difference By multiplying them, we can get the judgment value, which combines the information of the change rate and deviation degree of the fluid flow state. Through real-time monitoring and analysis of the judgment value, the changing trend and potential problems of the fluid flow state can be discovered in time.

[0059] In a preferred embodiment of the present invention, when the judgment value is close to a preset threshold, the early warning mode is activated, including:

[0060] The judgment value is compared with a preset fixed threshold value. If the judgment value is greater than the fixed threshold value, it is determined that there is data abnormality, and a problem has occurred in one group of signal detectors 9, and the alarm mode is activated.

[0061] The dynamic factor is adjusted according to the characteristic parameters of the non-stable flow state, and the judgment value is finally obtained. The calculated judgment value is compared with the preset fixed threshold value. This fixed threshold value is set according to the normal working range of the flow meter and possible abnormal conditions, and is used to distinguish the normal state and abnormal state of fluid flow. If the judgment value is greater than the fixed threshold value and lasts for a period of time (the time window can be set according to the actual situation), it is judged as data abnormality. It may be that one of the groups of signal detectors 9 has a problem, or the flow meter itself has a fault. At this time, the early warning mode is started and a warning signal is issued to prompt the operator to pay attention and check the working status of the flow meter. If the problem persists or the judgment value increases further and exceeds another higher threshold, the alarm mode is started and a stronger alarm signal is issued. It is necessary to stop the machine immediately for inspection or take other emergency measures. If the judgment value is abnormal and lasts for a period of time, it can be preliminarily judged that the signal detector or other components have a fault, which helps to quickly locate the problem and reduce the troubleshooting time. Through the analysis of historical data and early warning records, the maintenance plan of the flow meter can be optimized, preventive maintenance can be carried out in advance, and the service life of the equipment can be extended.

[0062] In a preferred embodiment of the present invention, two sets of pre-processed data are fused and calculated to obtain the actual flow rate in the pipe body 1, including:

[0063] The two sets of pre-processed data are fused to obtain the speed data;

[0064] The obtained fused speed data is combined with the principles of fluid mechanics and the cross-sectional area of ​​the pipe body to establish a pipe body model of the flow rate in the pipe body 1;

[0065] According to the pipe body model, the actual flow rate in the pipe body 1 is calculated.

[0066] First, the correlation between the two sets of data is evaluated. For example, the Pearson correlation coefficient can be used to quantify the quality of the data. Based on the above evaluation, a weight is assigned to each set of data. The weight can be any value between 0 and 1, and the sum of the weights of the two sets of data should be 1. For example, if the first set of data is more reliable, it may be assigned a higher weight, such as 0.7, while the second set of data is assigned a lower weight, such as 0.3.

[0067] For the speed data at each moment, the values ​​of the two sets of data are multiplied by their weights respectively, and then the two products are added together to obtain the fused speed data. The mathematical formula can be expressed as: fused speed = (first set of speed × first set of weights) + (second set of speed × second set of weights).

[0068] The basic principles of fluid mechanics, such as the Bernoulli equation or the continuity equation, are used to describe the behavior of the fluid in the tube 1. These equations involve parameters such as the velocity, pressure, and density of the fluid. The cross-sectional area information of the tube 1 is obtained because the flow rate Defined as the fluid velocity The product of the cross-sectional area A is: , but in practical applications, more complex flow patterns may need to be considered.

[0069] Combining the fused rotational speed data (which can be used as a proxy or related parameter for fluid velocity), the fluid mechanics equations, and the cross-sectional area of ​​the pipe, a mathematical model is constructed to describe the flow in the pipe. This model is an algebraic equation.

[0070] The specific calculation process of the algebraic equation is as follows:

[0071] Fusion speed It can be expressed as:

[0072] ;in and These are the first and second groups of speed data respectively; and are their respective weights; flow The fluid velocity is defined as Cross-sectional area of ​​the pipe The product of: ; Use fused speed data As a related parameter of fluid velocity . Therefore, we can get: ;

[0073] Density of the combined fluid and pressure , using the Bernoulli equation, it can be specifically:

[0074] Here, and Indicates the height. The height change of the fluid in the pipe can be ignored. , it is simplified to:

[0075] It is expressed as the relationship between the pressure and velocity of the fluid at different positions in the pipe body. The final algebraic equation describes the relationship between the flow rate in the pipe body and the fused rotation speed and cross-sectional area, which can be expressed as:

[0076] , this equation can describe the flow of fluid in a pipe and can calculate the flow rate by adjusting the rotation speed and cross-sectional area.

[0077] In a preferred embodiment of the present invention, a purification component is also provided at the left end of the tube body 1, and the purification component includes a first connecting pipe 12, the first connecting pipe 12 is fixedly connected to the left end of the tube body 1, the left end of the first connecting pipe 12 is fixedly connected to a vertical pipe 13, a second connecting pipe 14 is fixedly connected to the left side surface of the vertical pipe 13 near the upper end, a filter cartridge 15 with upper and lower openings is installed inside the vertical pipe 13, the filter cartridge 15 is arranged at the connection between the first connecting pipe 12 and the vertical pipe 13, annular plates 16 are fixedly provided at the upper and lower ends of the filter cartridge 15, the edge position of the annular plate 16 is fixedly connected to the inner wall of the vertical pipe 13, a gear 17 is installed inside the first connecting pipe 12, the gear 17 is meshedly connected to the outer cylindrical surface of the filter cartridge 15, a connecting shaft 18 is fixedly connected at the center position of the lower end surface of the gear 17, and an impeller 19 is fixedly connected to the lower end of the connecting shaft 18.

[0078] When liquid enters the tube body 1, the detection accuracy of the signal detector 9 can be greatly improved by removing solid impurities in the liquid. The metering accuracy of the flow meter can be greatly improved by improving the detection accuracy of the signal detector 9. In the present invention, when liquid enters the tube body 1, the liquid first passes through the second connecting pipe 14, and the liquid enters the vertical pipe 13 along the second connecting pipe 14, and then enters the first connecting pipe 12 along the vertical pipe 13, and enters the tube body 1 through the first connecting pipe 12. After the liquid enters the vertical pipe 13, it passes through the filter cartridge 15 to filter out impurities in the liquid. When the liquid passes through the impeller 19, it drives the impeller 19 to rotate. When the impeller 19 rotates, it drives the gear 17 to rotate. When the gear 17 rotates, it drives the filter cartridge 15 to rotate. When the filter cartridge 15 rotates, it continuously changes the area of ​​the filter. The filter cartridge 15 is prevented from being blocked and affecting the speed of the liquid.

[0079] In a preferred embodiment of the present invention, a liquid pressure sensor 25 is installed on the inner wall of the upper end of the vertical pipe 13. The liquid pressure sensor 25 is used to monitor the pressure data in the vertical pipe 13 in real time. The liquid pressure sensor 25 is electrically connected to the processing module. The processing module estimates the data collected by the signal detector 9 based on the pressure data at the same time, compares the estimated data at the same time with the data actually collected by the signal detector 9 at the same time, calculates the difference between the two, and compares the difference with a preset threshold value. If the difference is greater than the threshold value, it is determined that the filter cartridge 15 is blocked. If the difference is less than the threshold value, it is determined that the filtration condition of the filter cartridge 15 is normal.

[0080] When the filter cartridge 15 is clogged, the liquid pressure sensor 25 will detect that the pressure in the vertical pipe 13 has increased, and at this time the signal detector 9 will detect that the rotation speed of the impeller blade 5 has slowed down. The processing module estimates the rotation speed data collected by the signal detector 9 based on the pressure data at the same time, and compares the estimated data at the same time with the rotation speed data actually collected by the signal detector 9 at the same time, calculates the difference between the two, and compares this difference with a preset threshold value. If the difference is greater than the threshold, it is determined that the filter cartridge 15 is clogged. If the difference is less than the threshold, it is determined that the filtration condition of the filter cartridge 15 is normal. The estimated rotation speed data can also be compared with the actually collected data to obtain the degree of blockage of the filter cartridge 15. The larger the difference between the estimated rotation speed data and the actual rotation speed data, the more serious the blockage of the filter cartridge 15.

[0081] In a preferred embodiment of the present invention, a brush 23 is provided on one side of the inner wall of the filter cartridge 15, and the brush 23 is used to clean the inner wall of the filter cartridge 15. The upper end of the brush 23 is fixedly connected to the inner wall of the vertical pipe 13, and the lower end of the vertical pipe 13 is threadedly connected to a collecting cartridge 22, and the collecting cartridge 22 is made of transparent material.

[0082] When the filter barrel 15 rotates, the brush 23 will continuously clean the inner wall of the filter barrel 15, and the cleaned impurities will fall into the collecting barrel 22 to achieve automatic collection. The collecting barrel 22 is made of transparent material. By observing the collecting barrel 22, you can know how much impurities are collected in the collecting barrel 22. When a certain amount is collected, you can twist the collecting barrel 22 to disassemble the collecting barrel 22 and dump the impurities.

[0083] In a preferred embodiment of the present invention, the inner wall of the vertical pipe 13 is fixedly connected to a support rod 21 at a position above the collecting cylinder 22, and a sealing plate 20 is provided at the upper end of the support rod 21, which is used to seal the openings of a group of annular plates 16 at the lower end.

[0084] According to Bernoulli's principle, the greater the flow rate, the smaller the pressure. When the liquid flows over the sealing plate 20, the pressure at the lower end of the sealing plate 20 will be higher than the pressure at the upper end. The sealing plate 20 will move upward to block the opening of the corresponding annular plate 16 to prevent impurities in the collecting tube 22 from escaping. When the liquid no longer flows over the sealing plate 20, the pressures at the upper and lower ends of the sealing plate 20 are the same. The sealing plate 20 moves downward due to its own gravity and is supported by the support rod 21. At this time, the opening of the annular plate 16 and the impurities automatically fall into the collecting tube 22.

[0085] In a preferred embodiment of the present invention, the upper end of the connecting shaft 18 passes through the gear 17 and the upper end wall of the first connecting tube 12 and extends to the outside, the connecting shaft 18 is rotatably connected to the upper end wall of the first connecting tube 12, the upper end of the connecting shaft 18 is fixedly connected to a generator 24, a power supply battery is installed in the control box 11, and the generator 24 is electrically connected to the power supply battery.

[0086] When the impeller 19 rotates, it will also drive the connecting shaft 18 and the output shaft of the generator 24 to rotate, and the generator 24 will generate electricity, and the generated electricity will be stored in the power supply battery, and the power supply battery will supply power to the electrical components on the meter.

[0087] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A turbine mass flowmeter, comprising a tube body (1), wherein two groups of guides are arranged inside the tube body (1), the two groups of guides are symmetrically arranged, the guides are composed of a first guide plate (2) and a guide column (3), the first guide plates (2) are multiple groups and are distributed in an annular shape, the first guide plates (2) are fixedly connected to the outer surface of the guide column (3), and one end of the first guide plate (2) away from the guide column (3) is fixedly connected to the inner wall of the tube body (1); Features: A support column (8) is arranged between the two groups of guide columns (3); a plurality of groups of second guide plates (7) are fixedly connected to the outer surface of the support column (8); the second guide plates (7) are distributed in an annular shape; one end of the second guide plate (7) away from the support column (8) is fixedly connected to the inner wall of the tube body (1); bearings (4) are arranged at both left and right ends of the support column (8); evenly distributed impeller blades (5) are fixedly connected to the bearings (4); a rotating shaft (6) is fixedly connected to the left and right ends of the bearings (4); the rotating shaft (6) The pipe body (1) is rotatably connected to the guide column (3) and the support column (8) respectively; a signal detector (9) is installed on the inner wall of the pipe body (1) at a position directly above the impeller blade (5); the signal detector (9) is used to collect data on the rotation speed of the impeller blade (5); a connecting rod (10) is fixedly connected to the upper end of the signal detector (9); an end of the connecting rod (10) away from the signal detector (9) passes through the upper wall of the pipe body (1) and is fixedly connected to a control box (11); a processing module and an output module are installed in the control box (11); The processing module is used to pre-process the rotation speed signal of the impeller blade (5) to obtain two sets of pre-processed data; Calculate the difference between the two sets of preprocessed data, multiply the dynamic factor by the difference to obtain the judgment value. The specific processing process is: The processing module calculates the difference between the two sets of pre-processed data. If the difference is zero, the fluid flows stably in the flow meter; if the difference is not zero, the fluid flows abnormally in the flow meter; The dynamic factor is adjusted according to the detected non-steady flow characteristic parameters, the non-steady flow characteristic parameters including the flow velocity, temperature, pressure in the pipe body (1), the roughness of the inner wall of the pipe body (1), the density and viscosity of the liquid, and the dynamic factor is multiplied by the difference to obtain a judgment value; When the judgment value is close to the preset threshold, the early warning mode is activated. The specific processing process is as follows: The judgment value is compared with a preset fixed threshold value. If the judgment value is greater than the fixed threshold value, it is judged that there is data abnormality, and a problem occurs in one of the signal detectors (9), and an alarm mode is activated; The two sets of pre-processed data are fused and calculated to obtain the actual flow rate in the pipe body (1). The specific processing process is as follows: The two sets of pre-processed data are fused to obtain the speed data; The obtained fused speed data is combined with the principles of fluid mechanics and the cross-sectional area of ​​the pipe body to establish a pipe body model of the flow rate in the pipe body (1); According to the pipe body model, the actual flow rate in the pipe body (1) is calculated; The output module is used to output the results processed by the processing module; The left end of the tube body (1) is also provided with a purification component, the purification component comprising a first connecting tube (12), the first connecting tube (12) being fixedly connected to the left end of the tube body (1), the left end of the first connecting tube (12) being fixedly connected to a vertical tube (13), a second connecting tube (14) being fixedly connected to a position near the upper end of the left surface of the vertical tube (13), a filter cartridge (15) with upper and lower openings being installed inside the vertical tube (13), the filter cartridge (15) being arranged in the first connecting tube (12). At the connection with the vertical pipe (13), an annular plate (16) is fixedly provided at both upper and lower ends of the filter cartridge (15), the edge of the annular plate (16) is fixedly connected to the inner wall of the vertical pipe (13), a gear (17) is installed inside the first connecting pipe (12), the gear (17) is meshedly connected to the outer cylindrical surface of the filter cartridge (15), a connecting shaft (18) is fixedly connected at the center position of the lower end surface of the gear (17), and an impeller (19) is fixedly connected to the lower end of the connecting shaft (18); A liquid pressure sensor (25) is installed on the inner wall of the upper end of the vertical pipe (13). The liquid pressure sensor (25) is used to monitor the pressure data in the vertical pipe (13) in real time. The liquid pressure sensor (25) is electrically connected to the processing module. The processing module estimates the data collected by the signal detector (9) based on the pressure data at the same time, compares the estimated data at the same time with the data actually collected by the signal detector (9) at the same time, calculates the difference between the two, and compares the difference with a preset threshold value. If the difference is greater than the threshold value, it is determined that the filter cartridge (15) is blocked, and if the difference is less than the threshold value, it is determined that the filtering condition of the filter cartridge (15) is normal.

2. A turbine mass flowmeter according to claim 1, characterized in that: The speed signal of the impeller blade (5) is preprocessed to obtain two sets of preprocessed data, including: The two groups of signal detectors (9) respectively and independently collect the rotation speed signals of the impeller blades (5), and the collected rotation speed signals are sent to the analog-to-digital converter; The analog-to-digital converter samples the analog signal and converts the analog value of each sampling point into a corresponding digital value; The converted digital signal is transmitted to the processing module, and a new sampling point value is calculated based on the current and previous sampling points. In each iteration, the filter calculates a new filter value based on the previous sampling value and the current sampling value. The data after iterative filtering is the preprocessed data.

3. A turbine mass flowmeter according to claim 2, characterized in that: A brush (23) is provided on one side of the inner wall of the filter cartridge (15), and the brush (23) is used to clean the inner wall of the filter cartridge (15). The upper end of the brush (23) is fixedly connected to the inner wall of the vertical tube (13). The lower end of the vertical tube (13) is threadedly connected to a collecting cartridge (22), and the collecting cartridge (22) is made of a transparent material.

4. A turbine mass flowmeter according to claim 3, characterized in that: The inner wall of the vertical pipe (13) is fixedly connected to a support rod (21) at a position above the collecting cylinder (22), and a sealing plate (20) is provided at the upper end of the support rod (21). The sealing plate (20) is used to seal the openings of a group of annular plates (16) at the lower end.

5. A turbine mass flowmeter according to claim 4, characterized in that: The upper end of the connecting shaft (18) passes through the gear (17) and the upper end wall of the first connecting tube (12) and extends to the outside; the connecting shaft (18) is rotatably connected to the upper end wall of the first connecting tube (12); the upper end of the connecting shaft (18) is fixedly connected to a generator (24); a power supply battery is installed in the control box (11); and the generator (24) is electrically connected to the power supply battery.

Images