Turbine flowmeter fault diagnosis method, diagnosis system and turbine flowmeter

Abstract

The invention relates to the technical field of flowmeters, and discloses a fault diagnosis method, a diagnosis system and a turbine flowmeter for a turbine flowmeter, wherein the flow measurement component comprises a magnet and an induction coil, and the flow measurement component is used to output a frequency value of the turbine component cutting the induction coil during rotation; the fault diagnosis method comprises the following steps: obtaining measurement data of the flow measurement component, including an output frequency N; obtaining a pressure value P1 of the turbine component on the medium inflow side and a pressure value P2 of the turbine component on the medium outflow side in a pipe body; the core principle of fault diagnosis of the turbine flowmeter is that the flow size, rotation speed value and pressure value in the pipe body have a fixed corresponding relationship under different working conditions, and a reference range value is set in consideration of the error of the measurement value, and the working state of the turbine flow measurement component is accurately judged by comparing the obtained measurement data with the reference range value.

Description

Technical Field

[0001] The present invention relates to the technical field of flowmeters, and in particular to a turbine flowmeter fault diagnosis method, a diagnosis system and a turbine flowmeter. Background Art

[0002] The turbine flowmeter is mainly composed of a rectifier, a turbine combination, and a measuring component. The rectifier is a device installed in the front end pipe of the flowmeter to eliminate or reduce various non-axisymmetric and pulsating flows such as vortex flow and eccentric flow in the flow. The turbine combination is composed of a turbine, a shaft, and a bearing. The turbine combination senses the flow of the fluid and converts the flow velocity of the fluid into the rotation speed of the turbine combination. The measuring component is generally composed of a magnetic core and a coil. When the turbine blades are made of magnetic conductive material, the rotation of the turbine combination can generate a sinusoidal induced electrical signal in the measuring component. The frequency of this sinusoidal induced electrical signal is proportional to the rotation speed of the turbine combination and the fluid flow velocity. By collecting this signal and measuring its frequency, the fluid flow rate can be measured.

[0003] The existing turbine flowmeter is used to measure the flow rate of the medium and outputs a single frequency signal. It is widely used in the field of flow rate measurement. However, after the flowmeter fails, it is unable to self-detect the cause of the failure and issue a fault message, resulting in the inability to diagnose the fault of the measuring component and the turbine flowmeter during use. Summary of the invention

[0004] Aiming at the problem that the current turbine flowmeter cannot realize self-detection, the present invention provides a turbine flowmeter fault diagnosis method, a diagnosis system and a turbine flowmeter.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a fault diagnosis method for a turbine flowmeter, the turbine flowmeter comprising a tube body, a rectifier assembly arranged in the tube body and a turbine assembly arranged between the rectifier assemblies, the turbine assembly and the rectifier assembly are rotatably connected, a flow measurement assembly is arranged on the tube body at a position corresponding to the turbine assembly, the flow measurement assembly comprises a magnet and an induction coil, and the flow measurement assembly is used to output the output frequency of the turbine assembly cutting the induction coil during the rotation process;

[0006] The fault diagnosis method comprises the following steps:

[0007] Obtaining measurement data of the flow measurement component, including output frequency N and voltage amplitude V corresponding to the output frequency;

[0008] Obtain the pressure value P1 of the turbine assembly in the pipe body on the medium inflow side and the pressure value P2 of the turbine assembly on the medium outflow side;

[0009] Establish the corresponding relationship between the flow L and / or output frequency N and P1, P2, △P and their maximum values ​​P1max, P2max, △Pmax and minimum values ​​P1min, P2min, △Pmin when the turbine flowmeter is in normal working state, where △P is the difference between P1 and P2;

[0010] Establish the corresponding relationship between the flow rate L and P1, P2, △P and its maximum values ​​P1´max, P2´max, △P´max and minimum values ​​P1´min, P2´min, △P´min when the turbine assembly in the turbine flowmeter is stuck;

[0011] And / or establish a corresponding relationship between the output frequency N and the maximum and minimum values ​​of the voltage amplitude V corresponding to the output frequency when the turbine flowmeter is in normal working state;

[0012] The fault of the turbine flowmeter is diagnosed based on the acquired measurement data.

[0013] In the present invention, the core principle of fault diagnosis of the turbine flowmeter is to combine the pressure values ​​at the front and rear ends with the frequency signal;

[0014] The flow rate, speed value and pressure value in the pipe body have a fixed corresponding relationship under different working states (normal working state and different fault states), and the reference range value is set in consideration of the error of the measured value, so as to realize accurate judgment of various faults of the turbine flowmeter;

[0015] By obtaining the pressure values ​​P1 and P2, △P is calculated, and the reference value range of the pressure values ​​P1, P2 and △P is selected according to the output frequency N value measured by the flow measurement component. By comparing the actually obtained values ​​of P1, P2 and △P with the reference range values ​​of P1, P2 and △P selected by the corresponding output frequency N value, the working state of the turbine flow measurement component can be accurately judged.

[0016] As a further improvement to the technical solution of the present invention, the fault diagnosis of the turbine flowmeter includes the diagnosis of turbine component rotation hysteresis, induction coil failure, turbine component jamming, magnet magnetism weakening, and impeller installation position offset failure.

[0017] In the present invention, the feedback signal of the turbine flowmeter includes the frequency value of the turbine assembly cutting the magnetic induction coil during rotation and the medium pressure value at the inlet and outlet ends of the tube body, wherein the fault conditions affecting the output frequency value and pressure value are classified in detail, so that the operator can promptly inspect the cause of the fault and reduce the operating steps for determining the cause of the fault.

[0018] As a further improvement to the technical solution of the present invention, a fault diagnosis method for turbine assembly rotation hysteresis includes the following steps:

[0019] Step 1: When it is detected that the output frequency decreases and the pressure value increases, obtain the output frequency N before the change, and the current pressure values P1, P2, and △P.

[0020] Step 2: Determine the maximum pressure values P1max, P2max, and △Pmax corresponding to the pressure values according to the obtained output frequency N.

[0021] And calculate the corresponding flow rate value L according to the obtained output frequency N, and determine the minimum pressure values P1'min, P2'min, and △P'min corresponding to the flow rate value L.

[0022] Step 3: When the currently obtained pressure values satisfy P1max < P1 < P1'min, P2max < P2 < P2'min, and △Pmax < △P < △P'min, it can be determined that the turbine assembly has rotational hysteresis.

[0023] In the present invention, during the process of rotational hysteresis of the turbine assembly, the output frequency of the flow measurement assembly decreases, resulting in an inability to calculate the accurate size of the medium flow rate. In order to improve the judgment accuracy of the turbine flowmeter, obtain the output frequency N before the change and the current pressure values P1, P2, and △P, determine the comparison reference value through the output frequency before the change, and compare it with the current pressure values P1, P2, and △P, so as to accurately judge the fault state of the turbine assembly.

[0024] As a further improvement to the technical solution of the present invention, the diagnostic method for the induction coil fault includes the following steps:

[0025] Step 1: When the obtained output frequency N drops to 0, obtain the pressure values P1, P2, and △P when the output frequency drops to 0 and the output frequency N before the output frequency changes.

[0026] Step 2: Determine the maximum pressure values P1max, P2max, and △Pmax and the minimum pressure values P1min, P2min, and △Pmin corresponding to the pressure values according to the obtained output frequency N.

[0027] Step 3: When the currently obtained pressure values satisfy P1min < P1 < P1max, P2min < P2 < P2max, and △Pmin < △P < △Pmax, it can be determined that the induction coil is faulty.

[0028] In the present invention, when the induction coil fails, the turbine assembly maintains a normal rotation state, so that the medium pressure in the pipe does not change, and there is no sudden jump in the pressure value when the output frequency decreases, then it can be determined that the induction coil is faulty.

[0029] As a further improvement to the technical solution of the present invention, the fault diagnosis method for turbine component jamming includes the following steps:

[0030] Step 1: When the obtained output frequency N drops to 0, obtain the pressure values P1, P2, △P at the time when the output frequency is 0 and the output frequency N before the change of the output frequency.

[0031] Step 2: Calculate the corresponding flow value L based on the obtained output frequency N, and determine the maximum values P1´max, P2´max, △P´max and the minimum values P1´min, P2´min, △P´min of the corresponding pressure values through the flow value L.

[0032] Step 3: When the currently obtained pressure values satisfy P1´min < P1 < P1´max, P2´min < P2 < P2´max, △P´min < △P < △P´max, it can be judged that the turbine component is jammed.

[0033] In the present invention, when the output frequency changes, it is impossible to accurately judge the magnitude of the medium flow rate inside the turbine component. When the output frequency N drops to 0 within a certain time period, the measurement data before the change of the output frequency are obtained, so that the corresponding magnitude of the medium flow rate can be obtained and the pressure range values corresponding to the flow rate magnitude can be determined. By comparing the actually measured pressure values with the pressure range values, the fault state of the turbine component jamming can be accurately judged.

[0034] As a further improvement to the technical solution of the present invention, the fault diagnosis method for weakened magnet magnetism includes the following steps:

[0035] Step 1: When the pressure values P1, P2, △P and the output frequency N satisfy the corresponding relationship, obtain the output frequency N and the voltage amplitude V of the output frequency signal.

[0036] Step 2: Determine the minimum value Vmin of the voltage amplitude V of the output frequency signal according to the obtained output frequency N.

[0037] Step 3: When the voltage amplitude V of the obtained frequency signal satisfies V < Vmin, it can be judged that the magnet magnetism is weakened.

[0038] In the present invention, there is a proportional relationship between the output frequency N of the flow measurement component and the corresponding voltage amplitude V of the output frequency signal. By comparing the output frequency N with the minimum value of the corresponding voltage amplitude V of the output frequency signal, it can be judged whether the magnetic strength of the magnet changes.

[0039] As a further improvement to the technical solution of the present invention, the fault diagnosis method for the offset of the installation position of the turbine component includes the following steps:

[0040] Step 1: Obtain the output frequency N and the pressure values P1, P2, △P, and obtain the voltage amplitude V of the output frequency signal according to the output frequency N;

[0041] Step 2: Determine the maximum values P1max, P2max, △Pmax of the corresponding pressure values P1, P2, △P according to the obtained output frequency N;

[0042] Determine the maximum value Vmax of the voltage amplitude V of the corresponding output frequency signal according to the obtained output frequency N;

[0043] Step 3: When the obtained pressure values P1, P2, △P and the voltage amplitude V of the output frequency signal satisfy P1max < P1, P2max < P2, △Pmax < △P, Vmax < V, it can be determined that the installation position of the turbine assembly is offset.

[0044] In the present invention, according to the corresponding relationship between the voltage amplitude V and the output frequency N, and the corresponding relationship between the pressure values P1, P2, △P and the output frequency N, the corresponding maximum values Vmax, P1max, P2max, △Pmax of the voltage amplitude and the pressure value are determined. By comparing the actually measured voltage amplitude and pressure value with the maximum values of the voltage amplitude and pressure value error range, it can be determined whether the installation position of the turbine assembly is offset.

[0045] The present invention also provides a fault diagnosis system for a turbine flowmeter, including a fault diagnosis module, and the fault diagnosis module diagnoses the faults of the turbine flowmeter by using the above-mentioned fault diagnosis method for the turbine flowmeter.

[0046] In the present invention, the fault diagnosis method for the turbine flowmeter is integrated in the fault diagnosis module, and the measurement data of the turbine flowmeter are all transmitted to the fault diagnosis module, so as to quickly and accurately judge the fault state of the turbine flowmeter.

[0047] The present invention also provides a turbine flowmeter, which includes a pipe body, a rectifier assembly arranged in the pipe body, and a turbine assembly arranged between the rectifier assemblies. The turbine assembly is rotatably connected to the rectifier assembly. A flow measurement assembly is arranged at a position corresponding to the turbine assembly on the pipe body, a front-end pressure measurement assembly is arranged on the pipe body on the side of the rectifier assembly close to the medium inflow, and a rear-end pressure measurement assembly is arranged on the pipe body on the side of the rectifier assembly close to the medium outflow.

[0048] In the present invention, a front-end pressure measurement component and a rear-end pressure measurement component are provided on the turbine flowmeter. The medium pressures at the inlet end and the outlet end of the turbine flowmeter are measured by the front-end pressure measurement component and the rear-end pressure measurement component. Combining the above-mentioned turbine flowmeter fault diagnosis method, the flow measurement component, the front-end pressure measurement component, and the rear-end pressure measurement component provide accurate measurement data for the turbine flowmeter fault diagnosis method.

[0049] As a further improvement to the technical solution of the present invention, a data processing unit is provided on the pipe body. The data processing unit includes a data acquisition module and a fault diagnosis module. The front-end pressure measurement component, the rear-end pressure measurement component, and the flow measurement component are all connected to the data acquisition module. The fault diagnosis module diagnoses the faults of the turbine flowmeter by using the above-mentioned fault diagnosis method.

[0050] In the present invention, the measured values measured by the measurement components are transmitted to the fault diagnosis module through the data acquisition module, and the faults of the turbine flowmeter are diagnosed by the fault diagnosis method set in the fault diagnosis module, realizing an information-based and automated judgment mode as a whole, which is convenient for diagnosing the faults of the turbine flowmeter in the first time when a fault occurs.

[0051] As a further improvement to the technical solution of the present invention, the rectifier provided on the side close to the front-end pressure measurement component in the rectifier assembly is the first rectifier, and the rectifier provided on the side close to the rear-end pressure measurement component is the second rectifier;

[0052] The distance from the end of the first rectifier on the side close to the front-end pressure measurement component to the side of the front-end pressure measurement component is D1, where 1.8*d < D1 < 2.2*d, and d is the inner diameter value of the pipe body;

[0053] The distance from the end of the second rectifier on the side close to the rear-end pressure measurement component to the side of the rear-end pressure measurement component is D2, where 0.8*d < L2 < 1.2*d, and d is the inner diameter value of the pipe body.

[0054] In the present invention, in order to improve the measurement accuracy of the front-end pressure measurement component and the rear-end pressure measurement component for the medium pressure value, the front-end pressure measurement component and the rear-end pressure measurement component are arranged at appropriate positions to improve the accuracy of the measurement values of the front-end pressure measurement component and the rear-end pressure measurement component, providing an accurate basis for the fault diagnosis of the signal processing unit.

[0055] As a further improvement to the technical solution of the present invention, a temperature measurement component is provided on the pipe body, and the temperature measurement component is connected to the data acquisition module.

[0056] In the present invention, the temperature measurement component is used to measure the temperature value of the medium and transmit the temperature value to the data acquisition module. In combination with the correspondence between the medium density and the temperature, the real-time state of the medium is corrected. In combination with the relationship between the pressure measurement signal and the temperature, the accuracy of the pressure value is corrected to improve the signal processing unit to provide an accurate basis for the fault diagnosis of the turbine flowmeter.

[0057] As a further improvement to the technical solution of the present invention, the distance between the installation position of the temperature measurement component and the end position of the rectifier is not less than the inner diameter value of the tube body.

[0058] In the present invention, the temperature measurement component is arranged at an appropriate position to improve the measurement accuracy of the temperature measurement component and provide an accurate judgment basis for the fault diagnosis module.

[0059] As a further improvement to the technical solution of the present invention, a shell is provided on the tube body, and the shell is used to isolate the flow measurement component, the front-end pressure measurement component, the rear-end pressure measurement component and the temperature measurement component from the external environment.

[0060] In the present invention, in order to further improve the ability of the signal processing unit to accurately judge the fault state of the turbine flowmeter, the shell is set on the turbine flowmeter. The shell prevents each measuring component from being affected by external environmental factors, which causes errors in the measurement values ​​of the measuring components and makes it impossible for the fault diagnosis module to accurately judge the fault state of the turbine flowmeter.

[0061] The beneficial effects of the present invention are:

[0062] 1) The core principle of fault diagnosis of the turbine flowmeter in the present invention is to combine the pressure values ​​at the front and rear ends with the frequency signal. The medium flow rate in the turbine flowmeter, the rotation speed of the turbine assembly, and the pressure value of the medium have a fixed corresponding relationship under different working conditions (normal working condition and different fault conditions). The reference range value of the corresponding measurement data is set taking into account the error of the measurement value, and the real-time measurement data of the turbine flowmeter is compared to realize the judgment of different fault conditions of the turbine flowmeter.

[0063] 2) The turbine flowmeter is provided with a front-end pressure measuring component and a rear-end pressure measuring component, and the medium pressure at the inlet and outlet ends of the turbine flowmeter is measured by the front-end pressure measuring component and the rear-end pressure measuring component. Combined with the above-mentioned turbine flowmeter fault diagnosis method, the flow measurement component, the front-end pressure measurement component and the rear-end pressure measurement component provide accurate measurement data for the turbine flowmeter fault diagnosis method.

[0064] 3) In order to improve the measurement accuracy of the medium pressure value by the front-end pressure measurement component and the rear-end pressure measurement component, the front-end pressure measurement component and the rear-end pressure measurement component are set at appropriate positions to improve the accuracy of the measurement values ​​of the front-end pressure measurement component and the rear-end pressure measurement component, thereby providing an accurate basis for the fault diagnosis of the signal processing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0066] Figure 1 It is a schematic structural diagram of an implementation scheme of the turbine flowmeter of the present invention.

[0067] Figure 2 It is a top view of the internal structure of the shell of the turbine flowmeter of the present invention.

[0068] Figure 3 This is a diagram showing the corresponding relationship between the flow rate and the pressure value of the turbine flowmeter of the present invention.

[0069] Figure 4 This is a diagram showing the corresponding relationship between the frequency value and the pressure value of the turbine flowmeter of the present invention.

[0070] Figure 5 The figure is a corresponding relationship diagram of the frequency value and the pressure value range of the turbine flowmeter of the present invention.

[0071] Figure 6 The figure is a relationship diagram of the corresponding pressure value range when the turbine assembly of the turbine flowmeter of the present invention is in a stuck state.

[0072] Figure 7 This is a corresponding relationship diagram between the frequency value and the corresponding voltage amplitude of the turbine flowmeter of the present invention.

[0073] In the figure: 1-tube body; 2-flow measurement assembly; 3-turbine blade; 4-first rectifier; 5-second rectifier; 6-data acquisition module; 7-fault diagnosis module; 8-front-end pressure measurement assembly; 9-rear-end pressure measurement assembly; 10-temperature measurement assembly; 11-housing;

[0074] Ni is the frequency value output by the flow measurement component;

[0075] D1 is the distance between the first rectifier and the front-end pressure measurement component;

[0076] D2 is the distance between the second rectifier and the rear-end pressure measurement component;

[0077] D3 is the distance between the first rectifier and the temperature measurement component. DETAILED DESCRIPTION

[0078] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0079] Embodiment 1:

[0080] This embodiment provides a fault diagnosis method for a turbine flowmeter, wherein the turbine flowmeter comprises a tube body 1, a rectifier assembly arranged in the tube body 1, and a turbine assembly 3 arranged between the rectifier assemblies, wherein the turbine assembly 3 is rotatably connected to the rectifier assembly, and a flow measurement assembly 2 is arranged on the tube body 1 at a position corresponding to the turbine assembly 3, wherein the flow measurement assembly 2 comprises a magnet and an induction coil, and wherein the flow measurement assembly 2 is used to output an output frequency of the turbine assembly 3 cutting the induction coil during rotation;

[0081] The fault diagnosis method comprises the following steps:

[0082] Acquire measurement data of the flow measurement component 2, including the output frequency N and the voltage amplitude V corresponding to the output frequency;

[0083] Obtain a pressure value P1 of the turbine assembly 3 on the medium inflow side and a pressure value P2 of the turbine assembly 3 on the medium outflow side in the pipe body 1;

[0084] Establish the corresponding relationship between the flow L and / or output frequency N and P1, P2, △P and their maximum values ​​P1max, P2max, △Pmax and minimum values ​​P1min, P2min, △Pmin when the turbine flowmeter is in normal working state, where △P is the difference between P1 and P2;

[0085] Establish the corresponding relationship between the flow L and P1, P2, △P and their maximum values ​​P1´max, P2´max, △P´max and minimum values ​​P1´min, P2´min, △P´min when the turbine assembly 3 in the turbine flowmeter is in a stuck state;

[0086] And / or establish a corresponding relationship between the output frequency N and the maximum and minimum values ​​of the voltage amplitude V corresponding to the output frequency when the turbine flowmeter is in normal working state;

[0087] Diagnose the faults of the turbine flowmeter based on the acquired measurement data.

[0088] Furthermore, the fault diagnosis of the turbine flowmeter includes the diagnosis of the rotational hysteresis of the turbine assembly 3, induction coil faults, jamming of the turbine assembly 3, weakening of magnetism, and offset faults in the installation position of the impeller.

[0089] The fault diagnosis method for the rotational hysteresis of the turbine assembly 3 includes the following steps:

[0090] Step 1: When it is detected that the output frequency decreases and the pressure value increases, obtain the output frequency N before the change, and the current pressure values P1, P2, and △P.

[0091] Step 2: Determine the maximum pressure values P1max, P2max, and △Pmax corresponding to the pressure values according to the acquired output frequency N.

[0092] And calculate the corresponding flow value L based on the acquired output frequency N, and determine the minimum pressure values P1'min, P2'min, and △P'min corresponding to the flow value L.

[0093] Step 3: When the currently acquired pressure values satisfy P1max < P1 < P1'min, P2max < P2 < P2'min, and △Pmax < △P < △P'min, it can be judged that the turbine assembly 3 has rotational hysteresis.

[0094] The fault diagnosis method for induction coil faults includes the following steps:

[0095] Step 1: When the acquired output frequency N drops to 0, obtain the pressure values P1, P2, and △P when the output frequency drops to 0, and the output frequency N before the output frequency change.

[0096] Step 2: Determine the maximum pressure values P1max, P2max, and △Pmax and the minimum pressure values P1min, P2min, and △Pmin corresponding to the pressure values according to the acquired output frequency N.

[0097] Step 3; When the currently acquired pressure values satisfy P1min < P1 < P1max, P2min < P2 < P2max, and △Pmin < △P < △Pmax, it can be judged that there is an induction coil fault.

[0098] The fault diagnosis method for the jamming of the turbine assembly 3 includes the following steps:

[0099] Step 1: When the acquired output frequency N drops to 0, obtain the pressure values P1, P2, and △P when the output frequency is 0, and the output frequency N before the output frequency change.

[0100] Step 2: Calculate the corresponding flow value L based on the obtained output frequency N, and determine the maximum values P1´max, P2´max, △P´max and minimum values P1´min, P2´min, △P´min of the corresponding pressure values through the flow value L;

[0101] Step 3: When the currently obtained pressure values satisfy P1´min < P1 < P1´max, P2´min < P2 < P2´max, △P´min < △P < △P´max, it can be determined that the turbine assembly 3 is stuck.

[0102] The fault diagnosis method for weakened magnetism includes the following steps:

[0103] Step 1: When the corresponding relationship is satisfied among the obtained pressure values P1, P2, △P and the output frequency N, obtain the output frequency N and the voltage amplitude V of the output frequency signal;

[0104] Step 2: Determine the minimum value Vmin of the voltage amplitude V of the output frequency signal according to the obtained output frequency N;

[0105] Step 3: When the voltage amplitude V of the obtained frequency signal satisfies V < Vmin, it can be determined that the magnetism is weakened.

[0106] The fault diagnosis method for the offset installation position of the turbine assembly 3 includes the following steps:

[0107] Step 1: Obtain the output frequency N and the pressure values P1, P2, △P, and obtain the voltage amplitude V of the output frequency signal according to the output frequency N;

[0108] Step 2: Determine the maximum values P1max, P2max, △Pmax of the corresponding pressure values P1, P2, △P according to the obtained output frequency N;

[0109] Determine the maximum value Vmax of the voltage amplitude V of the corresponding output frequency signal according to the obtained output frequency N;

[0110] Step 3: When the obtained pressure values P1, P2, △P and the voltage amplitude V of the output frequency signal satisfy P1max < P1, P2max < P2, △Pmax < △P, Vmax < V, it can be determined that the impeller installation position is offset.

[0111] During the use of this embodiment, as the turbine assembly 3 cuts the magnetic induction lines of the induction coil during the flow of the medium in the pipe body 1, the flow measurement assembly 2 outputs a frequency signal value N, and according to the fact that there is a fixed corresponding relationship among the medium flow rate, the rotation speed value of the turbine assembly 3 and the medium pressure value in different states, a corresponding relationship among the output frequency signal value N, the flow rate L and the pressure values P1, P2, △P is established;

[0112] Through the mutual correspondence between the measurement data of the turbine flowmeter, the output frequency signal value of the turbine flowmeter, the pressure value on the inlet side and the pressure value on the outlet side of the turbine flowmeter and other measurement values ​​are measured, and each group of measurement data is compared to accurately judge the working state of the turbine flowmeter, wherein the detection range value of each measuring component can be calculated by fluid simulation analysis software (such as ANSYS-CFX, FLUENT, STAR-CCM, etc.), and the working state of the turbine flowmeter can be monitored by comparing the range value calculated by the simulation analysis software with the actual measurement value of each measuring component.

[0113] Based on the range value calculated by the simulation analysis software, the fault phenomenon for judging the fault of the turbine flowmeter is not limited to the above-mentioned fault phenomenon.

[0114] Furthermore, in the process of fault diagnosis of the turbine flowmeter, when the frequency value output by the flow measurement component 2 changes, it is impossible to accurately judge the flow size of the medium, resulting in the inability to accurately judge the fault diagnosis of the turbine flowmeter. In order to improve the accuracy of fault diagnosis of the turbine flowmeter, the real-time medium flow rate flowing through the turbine flowmeter can be obtained by the output power of the pump body connected to the turbine flowmeter. Through the real-time measurement of the medium flow rate, in the process of comparing the actual measurement value and the range value of the pressure value, the specific range value can be more accurately selected, thereby achieving accurate judgment of the working state of the turbine flowmeter.

[0115] Embodiment 2:

[0116] A fault diagnosis system for a turbine flowmeter in this embodiment includes a fault diagnosis module 7. The fault diagnosis module 7 uses the above-mentioned fault diagnosis method to diagnose the fault of the turbine flowmeter.

[0117] In this embodiment, the turbine flowmeter fault diagnosis method in Example 1 is set in the fault diagnosis module 7, so as to perform real-time detection of the working status of the turbine flowmeter, realize real-time detection of the turbine flowmeter, and enable the turbine flowmeter to judge the specific cause of the fault of the turbine flowmeter in the first time after the fault occurs, so as to provide the user with accurate judgment basis in the first time and avoid problems caused by the fault of the turbine flowmeter.

[0118] Embodiment 3:

[0119] A turbine flowmeter according to this embodiment is characterized in that the turbine flowmeter includes a pipe body 1, a rectifier assembly disposed within the pipe body 1, and a turbine assembly 3 disposed between the rectifier assemblies. The turbine assembly 3 is rotatably connected to the rectifier assembly. A flow measurement assembly 2 is provided at a position corresponding to the turbine assembly 3 on the pipe body 1. A front-end pressure measurement assembly 8 is provided on the pipe body 1 on the side of the rectifier assembly close to the inflow of the medium, and a rear-end pressure measurement assembly 9 is provided on the pipe body 1 on the side of the rectifier assembly close to the outflow of the medium.

[0120] Further, a data processing unit is provided on the pipe body 1. The data processing unit includes a data acquisition module 6 and a fault diagnosis module 7. The front-end pressure measurement assembly 8 and the rear-end pressure measurement assembly 9 are both connected to the data acquisition module 6. The fault diagnosis module 7 diagnoses the faults of the turbine flowmeter by using the above-mentioned fault diagnosis method.

[0121] In this embodiment, when setting the fault diagnosis method in the fault diagnosis module 7, a judgment logic can also be set for the fault states of the front-end pressure measurement assembly 8 and the rear-end pressure measurement assembly 9:

[0122] The fault diagnosis method for the front-end pressure measurement assembly 8 includes the following steps:

[0123] Step 1: Under the condition that the output frequency N is constant, obtain the output frequency N and the pressure value P1 measured by the front-end pressure measurement assembly 8.

[0124] Step 2: Determine the maximum value P1max of the corresponding pressure value P1 according to the obtained output frequency N.

[0125] Step 3: When the obtained pressure value P1 satisfies P1max < P1 < 5 * P1max, it can be judged that the front-end pressure measurement assembly 8 is faulty.

[0126] The fault diagnosis method for the rear-end pressure measurement assembly 9 includes the following steps:

[0127] Step 1: Under the condition that the output frequency N is constant, obtain the output frequency N and the pressure value P2 measured by the rear-end pressure measurement assembly 9.

[0128] Step 2: Determine the maximum value P2max of the corresponding pressure value P2 according to the obtained output frequency N.

[0129] Step 3: When the obtained pressure value P2 satisfies P2max < P2 < 5 * P2max, it can be judged that the rear-end pressure measurement assembly 9 is faulty.

[0130] Furthermore, the rectifier disposed on the side close to the front-end pressure measuring component 8 in the rectifier assembly is the first rectifier 4, and the rectifier disposed on the side close to the rear-end pressure measuring component 9 is the second rectifier 5;

[0131] The distance between the end of the first rectifier 4 close to the front-end pressure measuring component 8 and the front-end pressure measuring component 8 is D1, D1=2*d, d is the inner diameter of the tube body 1;

[0132] The distance between the end of the second rectifier 5 close to the rear end pressure measurement component 9 and the side of the rear end pressure measurement component 9 is D2, D2=d, and d is the inner diameter value of the tube body 1.

[0133] Furthermore, a temperature measurement component 10 is provided on the tube body 1 , and the temperature measurement component 10 is connected to the data acquisition module 6 .

[0134] Furthermore, the distance between the installation position of the temperature measurement component 10 and the end position of the rectifier is D3, D3=d, and d is the inner diameter value of the tube body 1.

[0135] According to the fault diagnosis method of the turbine flowmeter, when the corresponding relationship between the flow rate, frequency value and pressure value is established through the fluid simulation analysis software, the corresponding relationship between the temperature value and the pressure value can also be established through the fluid simulation analysis software, and the accuracy of the measured pressure value is detected by the change of the medium temperature value, so as to provide an accurate judgment basis for the fault diagnosis of the turbine flowmeter, thereby improving the fault diagnosis accuracy of the fault diagnosis module 7 for the turbine flowmeter;

[0136] At the same time, a reference range value of the temperature value can be set according to the medium characteristics, and the actual measurement data of the temperature measurement component 10 is compared with the reference range value of the temperature value to determine the fault of the temperature measurement component 10.

[0137] Furthermore, a shell 11 is provided on the tube body 1, and the shell 11 is used to isolate the flow measurement component 2, the front-end pressure measurement component 8, the rear-end pressure measurement component 9 and the temperature measurement component 10 from the external environment.

[0138] During use of this embodiment, the front-end pressure measurement component 8, the rear-end pressure measurement component 9 and the temperature measurement component 10 may cause certain errors in the measurement data of each measurement component according to the different installation positions. In order to improve the accuracy of the real-time detection values ​​of each measurement component, the front-end pressure measurement component 8, the rear-end pressure measurement component 9 and the temperature measurement component 10 are arranged at appropriate positions to improve the accuracy of the detection values ​​of each measurement component and provide an accurate judgment basis for the signal processing unit;

[0139] While setting the fault diagnosis method of the turbine flowmeter in the fault diagnosis module 7, the fault status of each measuring component can also be judged to ensure the working status of the measuring component and the accuracy of the measurement data of the measuring component;

[0140] Furthermore, multiple measuring components are isolated from the external environment through the shell 11 to prevent the measuring components from being affected by the external environment, resulting in the measurement data of each measuring component not being consistent with the actual situation, causing the signal processing unit to make an incorrect judgment on the working status of the turbine flowmeter.

[0141] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0142] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0143] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0144] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0145] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for diagnosing faults of a turbine flowmeter, the turbine flowmeter comprising a tube body (1), a rectifier assembly arranged in the tube body (1), and a turbine assembly (3) arranged between the rectifier assemblies, the turbine assembly (3) and the rectifier assembly being rotatably connected, a flow measurement assembly (2) being arranged on the tube body (1) at a position corresponding to the turbine assembly (3), characterized in that: The flow measurement component (2) includes a magnet and an induction coil, and the flow measurement component (2) is used to output the output frequency of the induction coil cut by the turbine component (3) during rotation; The fault diagnosis method includes the following steps: Obtain the measurement data of the flow measurement component (2), including the output frequency N and the voltage amplitude V corresponding to the output frequency; Obtain the pressure value P1 on the medium inflow side of the turbine component (3) in the pipe body (1) and the pressure value P2 on the medium outflow side of the turbine component (3); Establish the corresponding relationship between the flow rate L and / or the output frequency N and P1, P2, △P and their maximum values P1max, P2max, △Pmax and minimum values P1min, P2min, △Pmin when the turbine flowmeter is in a normal working state, where △P is the difference between P1 and P2; Establish the corresponding relationship between the flow rate L and P1, P2, △P and their maximum values P1´max, P2´max, △P´max and minimum values P1´min, P2´min, △P´min when the turbine component (3) in the turbine flowmeter is in a stuck state; Establish the corresponding relationship between the output frequency N and the maximum and minimum values of the voltage amplitude V corresponding to the output frequency when the turbine flowmeter is in a normal working state; Diagnose the faults of the turbine flowmeter according to the obtained measurement data.

2. The turbine flowmeter fault diagnosis method according to claim 1, characterized in that: The fault diagnosis of the turbine flowmeter includes the diagnosis of faults such as rotation hysteresis of the turbine component (3), induction coil faults, stuck of the turbine component (3), weakening of magnetism, and offset of the impeller installation position.

3. The turbine flowmeter fault diagnosis method according to claim 2, characterized in that: The fault diagnosis method for the rotation hysteresis of the turbine component (3) includes the following steps: Step 1: When it is detected that the output frequency decreases and the pressure value increases, obtain the output frequency N before the change and the current pressure values P1, P2, △P; Step 2: Determine the maximum values P1max, P2max, △Pmax of the corresponding pressure values according to the obtained output frequency N; And calculate the corresponding flow value L according to the obtained output frequency N, and determine the corresponding minimum pressure values P1´min, P2´min, △P´min through the flow value L; Step 3: When the obtained current pressure values satisfy P1max < P1 < P1´min, P2max < P2 < P2´min, △Pmax < △P < △P´min, it can be judged that the turbine component (3) has rotation hysteresis.

4. The turbine flowmeter fault diagnosis method according to claim 2, characterized in that: The diagnosis method for induction coil faults includes the following steps: Step 1: When the obtained output frequency N drops to 0, obtain the pressure values P1, P2, △P when the output frequency drops to 0 and the output frequency N before the output frequency changes; Step 2: Determine the maximum values P1max, P2max, △Pmax and minimum values P1min, P2min, △Pmin of the corresponding pressure values according to the obtained output frequency N; Step 3; When the obtained current pressure values satisfy P1min < P1 < P1max, P2min < P2 < P2max, △Pmin < △P < △Pmax, it can be judged that there is an induction coil fault.

5. The turbine flowmeter fault diagnosis method according to claim 2, characterized in that: The fault diagnosis method for the stuck of the turbine component (3) includes the following steps: Step 1: When the obtained output frequency N drops to 0, obtain the pressure values P1, P2, △P at the time when the output frequency is 0, and the output frequency N before the change of the output frequency. Step 2: Calculate the corresponding flow rate value L according to the obtained output frequency N, and determine the maximum values P1´max, P2´max, △P´max and the minimum values P1´min, P2´min, △P´min of the corresponding pressure values through the flow rate value L. Step 3: When the currently obtained pressure values satisfy P1´min < P1 < P1´max, P2´min < P2 < P2´max, △P´min < △P < △P´max, it can be determined that the turbine assembly (3) is stuck.

6. The turbine flowmeter fault diagnosis method according to claim 2, characterized in that: The fault diagnosis method for the weakening of the magnetism of the magnet includes the following steps: Step 1: When the corresponding relationship is satisfied between the obtained pressure values P1, P2, △P and the output frequency N, obtain the output frequency N and the voltage amplitude V of the output frequency signal. Step 2: Determine the minimum value Vmin of the voltage amplitude V of the output frequency signal according to the obtained output frequency N. Step 3: When the voltage amplitude V of the obtained frequency signal satisfies V < Vmin, it can be determined that the magnetism of the magnet is weakened.

7. The turbine flowmeter fault diagnosis method according to claim 2, characterized in that: The fault diagnosis method for the offset of the installation position of the turbine assembly (3) includes the following steps: Step 1: Obtain the output frequency N and the pressure values P1, P2, △P, and obtain the voltage amplitude V of the output frequency signal according to the output frequency N. Step 2: Determine the maximum values P1max, P2max, △Pmax of the corresponding pressure values P1, P2, △P according to the obtained output frequency N. Determine the maximum value Vmax of the voltage amplitude V of the corresponding output frequency signal according to the obtained output frequency N. Step 3: When the obtained pressure values P1, P2, △P and the voltage amplitude V of the output frequency signal satisfy P1max < P1, P2max < P2, △Pmax < △P, Vmax < V, it can be determined that the installation position of the impeller is offset.

8. A fault diagnosis system for a turbine flowmeter, characterized in that: It includes a fault diagnosis module (7), and the fault diagnosis module (7) diagnoses the faults of the turbine flowmeter by using the fault diagnosis method described in any one of claims 1 to 7.

9. A turbine flowmeter, characterized in that: The turbine flowmeter includes a pipe body (1), a rectifier assembly arranged in the pipe body (1), and a turbine assembly (3) arranged between the rectifier assemblies. The turbine assembly (3) is rotatably connected to the rectifier assembly. A flow measurement assembly (2) is arranged at a position corresponding to the turbine assembly (3) on the pipe body (1). A front-end pressure measurement assembly (8) is arranged on the pipe body (1) on the side of the rectifier assembly close to the inflow of the medium, and a rear-end pressure measurement assembly (9) is arranged on the pipe body (1) on the side of the rectifier assembly close to the outflow of the medium. A data processing unit is provided on the pipe body (1). The data processing unit includes a data acquisition module (6) and a fault diagnosis module (7). The front-end pressure measurement component (8), the back-end pressure measurement component (9), and the flow measurement component (2) are all connected to the data acquisition module (6). The fault diagnosis module (7) diagnoses the faults of the turbine flowmeter by using the fault diagnosis method described in any one of claims 1 to 7.

10. The turbine flowmeter according to claim 9, characterized in that: In the rectifier assembly, the rectifier provided on the side close to the front-end pressure measurement component (8) is the first rectifier (4), and the rectifier provided on the side close to the back-end pressure measurement component (9) is the second rectifier (5); The distance from the end of the first rectifier (4) on the side close to the front-end pressure measurement component (8) to the side of the front-end pressure measurement component (8) is D1, where 1.8*d < D1 < 2.2*d, and d is the inner diameter value of the pipe body (1); The distance from the end of the second rectifier (5) on the side close to the back-end pressure measurement component (9) to the side of the back-end pressure measurement component (9) is D2, where 0.8*d < D2 < 1.2*d, and d is the inner diameter value of the pipe body (1).

11. The turbine flowmeter according to claim 9, characterized in that: A temperature measurement component (10) is provided on the pipe body (1), and the temperature measurement component (10) is connected to the data acquisition module (6).

12. The turbine flowmeter according to claim 11, characterized in that: The distance between the installation position of the temperature measurement component (10) and the end position of the rectifier is not less than the inner diameter value of the pipe body (1).

13. The turbine flowmeter according to claim 11, characterized in that: A housing (11) is provided on the pipe body (1), and the housing (11) is used to isolate the flow measurement component (2), the front-end pressure measurement component (8), the back-end pressure measurement component (9), and the temperature measurement component (10) from the external environment.

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