A method for calibrating vortex flow meter vortex signal

Abstract

This invention relates to the field of vortex flowmeter technology, specifically to a method for calibrating vortex signals of vortex flowmeters. The method includes: deploying two sets of vortex flowmeters on a fluid transmission pipeline, wherein the widths of the vortex generators of the two sets of flowmeters are 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline, respectively; when fluid is being transported in the pipeline, the two sets of flowmeters are used to measure the vortex signals of the fluid; while the fluid is being transported in the pipeline, the pumping pressure at the pumping end is acquired; based on the pumping pressure, the operating frequency of the vortex flowmeters is set; and the vortex flowmeters are used to operate at the set frequency to measure the vortex signals of the fluid passing through the flowmeters in the pipeline. This invention provides intelligent calibration conditions for the final detection of vortex signals by deploying two sets of vortex flowmeters on the fluid transmission pipeline.

Description

Technical Field

[0001] This invention relates to the field of vortex flowmeter technology, and specifically to a method for calibrating vortex flowmeter signals. Background Technology

[0002] A vortex flow meter is an instrument used to measure the flow rate of a medium fluid. It is mainly used for measuring the flow rate of various media such as gas, liquid, and steam in industrial pipelines.

[0003] The invention patent with application number 201810480013.1 discloses a thermal vortex flow metering device, including a measuring pipe (1), characterized in that: it also includes a vortex generator (2) for generating a regular vortex signal in the fluid to be measured. The vortex generator (2) is located inside the measuring pipe (1). The vortex generator (2) is provided with a flow channel (3) for fluid to pass through. The flow channel (3) is provided with a sensor for detecting the vortex frequency. The sensor is a thermal sensor (4). The vortex generator (2) is a columnar structure arranged along the diameter line of the cross section of the measuring pipe (1). The cross section of the vortex generator (2) is triangular or trapezoidal.

[0004] This application aims to address the following issues: 1. Traditional vortex flow meters have a range of 1:20 and use piezoelectric crystals as sensors. During vortex frequency measurement, if the fluid velocity is less than 5 m / s and the flow rate is too low, the vortex shedding through the sensor becomes too small to be detected, making it impossible for traditional vortex flow meters to measure. 2. Traditional vortex flow meters require a high degree of straightness in the upstream pipe section during installation, which may not be feasible, limiting their application in many situations. 3. The sensor in a vortex flow meter is fixed downstream of the columnar vortex generator. When the measuring pipe vibrates axially along the pipe, the sensor inside the pipe will move relative to the fluid, causing the piezoelectric crystal to misinterpret this relative motion as a flow signal, affecting the accuracy of the flow meter.

[0005] However, during use, the vortex flowmeter is subject to dynamic changes such as the transmission pressure of the fluid in the connected pipeline, which leads to certain errors in the detected vortex signal. Existing vortex signal calibration technology relies heavily on prior data of vortex signal detection.

[0006] Therefore, we propose a vortex flow meter vortex signal calibration method. Summary of the Invention

[0007] In view of the above-mentioned shortcomings of the prior art, the present invention provides a vortex flowmeter vortex signal calibration method, which solves the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A method for calibrating the vortex signal of a vortex flowmeter includes:

[0010] Two sets of vortex flow meters are deployed on the fluid transmission pipeline. The widths of the vortex generators of the two sets of vortex flow meters are 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline, respectively. When the fluid is transmitted in the fluid transmission pipeline, the two sets of vortex flow meters deployed on the fluid transmission pipeline are used to measure the vortex signal of the fluid.

[0011] When the fluid is being transported in the fluid transmission pipeline, the pumping pressure at the fluid pumping end is obtained. The operating frequency of the vortex flow meter is set based on the pumping pressure at the fluid pumping end. The vortex flow meter is then used to operate at the set operating frequency to measure the vortex signal of the fluid passing through the vortex flow meter in the fluid transmission pipeline.

[0012] The system acquires the fluid vortex signal measured by the vortex flow meter, identifies the source of the fluid vortex signal as the vortex flow meter, distinguishes the acquired fluid vortex signal based on the identification result, configures the weights of the two sets of fluid vortex signals to be distinguished, and performs fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals.

[0013] The system continuously acquires and stores fluid vortex signals after calibration, and evaluates the fluid transport stability in the current fluid transport pipeline based on the stored fluid vortex signals.

[0014] Furthermore, the two sets of vortex flow meters are deployed on the fluid transmission pipeline as follows: the total length of the fluid transmission pipeline is measured, and the vortex flow meters are deployed at a distance of one-quarter of the total length of the fluid transmission pipeline from one end to the other.

[0015] When the fluid transmission pipeline is a straight pipeline, the deployment position of the vortex flow meter is determined based on the above logic; when the fluid transmission pipeline is a bent pipeline, after determining the deployment position of the vortex flow meter based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two sets of vortex flow meters relative to the bend position of the fluid transmission pipeline, and the bend angle of the fluid transmission pipeline are further obtained, and the deployment position of the vortex flow meter is adjusted based on the transmission direction, path length, and bend angle.

[0016] There is at most one bend in the local fluid transmission pipe between the two sets of vortex flowmeters.

[0017] Furthermore, when the fluid transmission pipeline is a bend, the adjustment logic for the deployment location of the vortex flowmeter is expressed as follows:

[0018]

[0019] In the formula: L up-s For the deployment location offset of the upstream vortex flow meter; L down-s θ is the offset of the downstream vortex flow meter deployment location; θ is the adjustment factor; L0 is the total length of the fluid transmission pipeline; L is the path length from the downstream vortex flow meter deployment location to the bend angle of the fluid transmission pipeline; A is the bend angle of the fluid transmission pipeline.

[0020] Where the adjustment factor θ > 1, and control L up-s Always less than L down-s f(|A-90|) represents the constraint function. When the bending angle A of the fluid transmission pipeline is greater than or equal to 90°, f(|A-90|) = 1 when |A-90| = 0, and f(|A-90|) = |A-90| when |A-90| > 0. y[|L|×f(|A-90|)] represents the constraint function. When |L|×f(|A-90|) > 1, y[|L|×f(|A-90|)] = |L|×f(|A-90|), and when |L|×f(|A-90|) ≤ 1, y[|L|×f(|A-90|)] = 1. The unit of measurement for the length of the fluid transmission pipeline is meters.

[0021] Furthermore, the offset L of the upstream vortex flow meter deployment location up-s and the offset L of the downstream vortex flow meter deployment location down-s After obtaining the values, the deployment positions of the corresponding vortex flow meters are offset based on the two sets of offsets. When the two sets of vortex flow meters are offset, the offset states are offsets that move away from each other along the fluid transmission path of the fluid transmission pipeline.

[0022] The width of the vortex generator of the upstream vortex flow meter is 1 / 10 of the inner diameter of the fluid transmission pipe, while the width of the vortex generator of the downstream vortex flow meter is set based on the width setting logic.

[0023] Furthermore, when setting the width of the vortex generator of the downstream vortex flowmeter, the width setting logic applied is expressed as follows:

[0024]

[0025] In the formula: w is the set width of the vortex generator of the downstream vortex flow meter; d down-s The diameter of the fluid transport pipe at the deployment location of the downstream vortex flow meter; d up-s s is the diameter of the fluid transmission pipe at the deployment location of the upstream vortex flow meter; k is the ratio of the width of the vortex generator to the inner diameter of the fluid transmission pipe; s up-s The upstream vortex flow meter is deployed in the fluid transport pipeline to transport the target fluid velocity; s down-sThe downstream vortex flowmeter deployment location is determined by the fluid transfer pipeline, which transmits the target fluid velocity; τ is an adjustment factor.

[0026] in, In the above, when the fluid transmission pipeline is straight, k is 1 / 20 and "±" is "+"; when the fluid transmission pipeline is bent, k is 1 / 15 and "±" is "-"; the adjustment factor τ is 1 or -1. When the adjustment factor τ is -1, When the adjustment factor τ is 1, s up-s With s down-s Customizable by the user.

[0027] Furthermore, the operating frequency of the vortex flow meter is set according to the following principle: the higher the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flow meter; conversely, the lower the pumping pressure at the fluid pumping end, the higher the operating frequency of the vortex flow meter. The vortex flow meter operates based on a user-defined time threshold. When the vortex flow meter operates under the conditions of the user-defined time threshold and the set operating frequency, the number of times the vortex flow meter operates is not less than three. The sum and average of the earliest measured fluid vortex signal and the most recent measured fluid vortex signal is recorded as the fluid vortex signal currently measured by the vortex flow meter. Furthermore, when distinguishing the fluid vortex signals based on their source, the two sets of fluid vortex signals are recorded as fluid vortex signal α and fluid vortex signal β.

[0028] Among them, the fluid vortex signal α always originates from the downstream vortex flow meter, and the fluid vortex signal β always originates from the upstream vortex flow meter.

[0029] Furthermore, the fluid vortex signal includes a frequency signal and a voltage signal, and both the fluid vortex signal α and the fluid vortex signal β are integrated from a set of frequency signals and a set of voltage signals;

[0030] The operation of configuring the weights of fluid vortex signals involves configuring the frequency signal weights and voltage signal weights in fluid vortex signals α and β.

[0031] Furthermore, the configuration logic for the fluid vortex shedding signal weights is expressed as follows:

[0032]

[0033] In the formula: ω1 and ω2 are the application weights of the frequency signals in the fluid vortex signal α and the fluid vortex signal β, and the application weights of the voltage signals in the fluid vortex signal α and the fluid vortex signal β; u is the total number of pumping pressure sensing operations at the fluid pumping end; p v σ represents the pumping pressure value at the pumping end of the fluid sensed at the vth time; σ is the normalization factor.

[0034] in, Table Find the mean. Table The average value is calculated by a pressure sensor installed at the fluid pressure pumping end. The pumping pressure of the fluid pumped at the fluid pressure pumping end is sensed at a specified period based on the pressure sensor, and the normalization factor σ∈(0,1).

[0035] Furthermore, the operation of calibrating the fluid vortex shedding signal is as follows:

[0036]

[0037] In the formula: P is the frequency signal in the fluid vortex shedding signal; V is the voltage signal in the fluid vortex shedding signal; p α p is the frequency signal in the fluid vortex shear signal α; β The frequency signal β in the fluid vortex shear signal; v α The voltage signal in the fluid vortex shear signal α; v β The voltage signal in the fluid vortex shedding signal β;

[0038] Among them, the frequency signal represents the frequency value of vortex generation when the fluid flows through the vortex generator, and the voltage signal represents the voltage fluctuation value generated by the sensor on the vortex flowmeter when the fluid pressure fluctuation acts on the sensor during the vortex generation stage when the fluid flows through the vortex generator.

[0039] Furthermore, when performing the evaluation operation on the fluid transmission stability of the current fluid transmission pipeline, the stored fluid vortex signal is obtained based on the stored time sequence. The difference between the continuous changes of the frequency signal and voltage signal in the fluid vortex signal is calculated, a stability evaluation threshold is set, and the stability judgment threshold is compared with the calculated difference to evaluate whether the fluid transmission of the current fluid transmission pipeline is stable.

[0040] Compared with known public technologies, the technical solution provided by this invention has the following advantages:

[0041] Beneficial effects:

[0042] This invention provides a vortex flow meter vortex signal calibration method. In the process of execution, the method provides intelligent calibration conditions for the final detection of the vortex signal of the vortex flow meter by deploying two sets of vortex flow meters on the fluid transmission pipeline.

[0043] During the deployment phase of the vortex flow meter, the deployment configuration of the vortex flow meter is based on specific logic, taking into account the flow direction characteristics of the fluid and the transmission pipeline. This enables the deployed vortex flow meter to detect the most representative fluid vortex signal. Further, a fluid vortex signal detection logic is set to detect and select the fluid vortex signal at a specified frequency. Finally, weights are assigned to the detected fluid vortex signals, and the fluid vortex signals are calibrated based on these weights. This allows the fluid vortex signals detected by the vortex flow meter to be calibrated based on the above. The stability of the fluid transmitted in the fluid transmission pipeline is then evaluated using the calibrated fluid vortex signals obtained through this method. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0045] Figure 1 This is a flowchart illustrating a vortex signal calibration method for a vortex flowmeter.

[0046] Figure 2 This is a schematic diagram illustrating the deployment logic of the vortex flow meter in this invention;

[0047] Figure 3 In this invention Figure 2 A schematic diagram showing the results of further adjustments to the deployment location of the vortex flowmeter in map (b);

[0048] Figure 4 This is a schematic diagram of the vortex flow meter structure in this invention;

[0049] Figure 5 This is a schematic diagram of the flow state of fluid in the fluid transmission pipeline affected by the vortex generator in this invention. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] The present invention will be further described below with reference to embodiments.

[0052] Example 1:

[0053] This embodiment provides a method for calibrating the vortex signal of a vortex flowmeter, such as... Figure 1 As shown, it includes:

[0054] Two sets of vortex flow meters are deployed on the fluid transmission pipeline. The widths of the vortex generators of the two sets of vortex flow meters are 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline, respectively. When the fluid is transmitted in the fluid transmission pipeline, the two sets of vortex flow meters deployed on the fluid transmission pipeline are used to measure the vortex signal of the fluid.

[0055] When the fluid is being transported in the fluid transmission pipeline, the pumping pressure at the fluid pumping end is obtained. The operating frequency of the vortex flow meter is set based on the pumping pressure at the fluid pumping end. The vortex flow meter is then used to operate at the set operating frequency to measure the vortex signal of the fluid passing through the vortex flow meter in the fluid transmission pipeline.

[0056] The operating frequency setting of the vortex flow meter follows the principle that the higher the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flow meter, and vice versa. The vortex flow meter operates based on a user-defined time threshold. Under the limited conditions of the user-defined time threshold and the set operating frequency, the vortex flow meter runs no less than three times. The sum and average of the earliest and most recent fluid vortex signals are recorded as the fluid vortex signal currently being measured by the vortex flow meter. When further distinguishing the fluid vortex signals based on their source, the two sets of fluid vortex signals are recorded as fluid vortex signal α and fluid vortex signal β.

[0057] Among them, the fluid vortex signal α always originates from the downstream vortex flow meter, and the fluid vortex signal β always originates from the upstream vortex flow meter.

[0058] Fluid vortex signals include frequency signals and voltage signals. Fluid vortex signals α and β are both integrated from a set of frequency signals and a set of voltage signals.

[0059] The operation of configuring the weights of fluid vortex signals includes configuring the weights of the frequency signal and the voltage signal in fluid vortex signals α and β.

[0060] The configuration logic for the fluid vortex shear signal weights is as follows:

[0061]

[0062] In the formula: ω1 and ω2 are the application weights of the frequency signals in the fluid vortex signal α and the fluid vortex signal β, and the application weights of the voltage signals in the fluid vortex signal α and the fluid vortex signal β; u is the total number of pumping pressure sensing operations at the fluid pumping end; p vσ represents the pumping pressure value at the pumping end of the fluid sensed at the vth time; σ is the normalization factor.

[0063] in, Table Find the mean. Table The average value is obtained by setting a pressure sensor at the fluid pressure pumping end. The pumping pressure of the fluid pumped at the fluid pressure pumping end is sensed at a specified period based on the pressure sensor. The normalization factor σ∈(0,1).

[0064] The operation for calibrating fluid vortex shedding signals is as follows:

[0065]

[0066] In the formula: P is the frequency signal in the fluid vortex shedding signal; V is the voltage signal in the fluid vortex shedding signal; p α p is the frequency signal in the fluid vortex shear signal α; β The frequency signal β in the fluid vortex shear signal; v α The voltage signal in the fluid vortex shear signal α; v β The voltage signal in the fluid vortex shedding signal β;

[0067] Among them, the frequency signal represents the frequency value of vortex generation when the fluid flows through the vortex generator, and the voltage signal represents the voltage fluctuation value generated by the sensor on the vortex flowmeter when the fluid pressure fluctuation acts on the sensor during the vortex generation stage when the fluid flows through the vortex generator.

[0068] The system acquires the fluid vortex signal measured by the vortex flow meter, identifies the source of the fluid vortex signal as the vortex flow meter, distinguishes the acquired fluid vortex signal based on the identification result, configures the weights of the two sets of fluid vortex signals to be distinguished, and performs fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals.

[0069] The system continuously acquires and stores fluid vortex signals after calibration, and evaluates the fluid transport stability in the current fluid transport pipeline based on the stored fluid vortex signals.

[0070] In this embodiment, by executing the method described in the above embodiments and simultaneously deploying two sets of vortex flow meters, the calibration of the vortex flow meter operation detection vortex signal is realized, which effectively improves the accuracy of the vortex flow meter operation detection vortex signal in the application scenario of the vortex flow meter, making the vortex flow meter operation detection vortex signal more reliable and more valuable for reference.

[0071] See Figure 2 , Figure 3As shown, Figure (a) and Figure (b) represent a straight fluid transmission pipe and a bent fluid transmission pipe, respectively. In Figure (b), the arrows indicate the direction of the transmitted fluid, which is the same as in Figure (a). The black dots in the figures represent the deployment locations of the vortex flowmeters. Since Figure (a) is a straight fluid transmission pipe, the deployment location of the vortex flowmeter in Figure (a) is determined based on the deployment location design logic described in the embodiment. Since Figure (b) is a bent fluid transmission pipe, the deployment location of the vortex flowmeter is further adjusted based on the deployment location design logic described in the embodiment. The specific adjustment results are as follows... Figure 3 It is displayed in the middle.

[0072] Example 2:

[0073] At the implementation level, based on Example 1, this example refers to... Figure 1 The vortex signal calibration method of a vortex flowmeter in Example 1 is further described in detail below:

[0074] The two sets of vortex flow meters are deployed on the fluid transmission pipeline as follows: the total length of the fluid transmission pipeline is measured, and the vortex flow meters are deployed at a distance of one-quarter of the total length of the fluid transmission pipeline from one end to the other.

[0075] When the fluid transmission pipeline is straight, the deployment location of the vortex flow meter is determined based on the above logic. When the fluid transmission pipeline is curved, after determining the deployment location of the vortex flow meter based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two sets of vortex flow meters relative to the curve of the fluid transmission pipeline, and the curve angle of the fluid transmission pipeline are further obtained. The deployment location of the vortex flow meter is then adjusted based on the transmission direction, path length, and curve angle.

[0076] Among them, there is at most one set of bends in the local fluid transmission pipe between the two sets of vortex flowmeters;

[0077] When the fluid transmission pipeline is a bend, the adjustment logic for the deployment location of the vortex flow meter is expressed as follows:

[0078]

[0079] In the formula: L up-s For the deployment location offset of the upstream vortex flow meter; L down-s θ is the offset of the downstream vortex flow meter deployment location; θ is the adjustment factor; L0 is the total length of the fluid transmission pipeline; L is the path length from the downstream vortex flow meter deployment location to the bend angle of the fluid transmission pipeline; A is the bend angle of the fluid transmission pipeline.

[0080] Where the adjustment factor θ > 1, and control L up-s Always less than Ldown-s f(|A-90|) represents the constraint function. When the bending angle A of the fluid transmission pipeline is greater than or equal to 90°, f(|A-90|) = 1 when |A-90| = 0, and f(|A-90|) = |A-90| when |A-90| > 0. y[|L|×f(|A-90|)] represents the constraint function. When |L|×f(|A-90|) > 1, y[|L|×f(|A-90|)] = |L|×f(|A-90|), and when |L|×f(|A-90|) ≤ 1, y[|L|×f(|A-90|)] = 1. The unit of measurement for the length of the fluid transmission pipeline is meters.

[0081] like Figure 1 As shown, the offset L of the upstream vortex flow meter deployment location up-s and the offset L of the downstream vortex flow meter deployment location down-s After obtaining the values, the deployment positions of the corresponding vortex flow meters are offset based on the two sets of offsets. When the two sets of vortex flow meters are offset, the offset states are offsets that move away from each other along the fluid transmission path of the fluid transmission pipeline.

[0082] The width of the vortex generator of the upstream vortex flow meter is 1 / 10 of the inner diameter of the fluid transmission pipe, while the width of the vortex generator of the downstream vortex flow meter is set based on the width setting logic.

[0083] The above settings provide further data support for the execution of the steps in the method of Example 1. At the same time, the adjustment logic of the deployment location of the vortex flow meter is further limited by the logical formula to ensure that the vortex flow meter can be accurately and effectively configured based on the above settings, so as to realize the deployment of the vortex flow meter. By detecting the vortex signal through the operation of the vortex flow meter, data support is provided for the further execution of the method in Example 1.

[0084] Example 3:

[0085] At the implementation level, based on Example 1, this example refers to... Figure 1 The vortex signal calibration method of a vortex flowmeter in Example 1 is further described in detail below:

[0086] When setting the width of the vortex generator in the downstream vortex flow meter, the width setting logic is expressed as follows:

[0087]

[0088] In the formula: w is the set width of the vortex generator of the downstream vortex flow meter; d down-s The diameter of the fluid transport pipe at the deployment location of the downstream vortex flow meter; d up-ss is the diameter of the fluid transmission pipe at the deployment location of the upstream vortex flow meter; k is the ratio of the width of the vortex generator to the inner diameter of the fluid transmission pipe; s up-s The upstream vortex flow meter is deployed in the fluid transport pipeline to transport the target fluid velocity; s down-s The downstream vortex flowmeter deployment location is determined by the fluid transfer pipeline, which transmits the target fluid velocity; τ is an adjustment factor.

[0089] in, In the above, when the fluid transmission pipeline is straight, k is 1 / 20 and "±" is "+"; when the fluid transmission pipeline is bent, k is 1 / 15 and "±" is "-"; the adjustment factor τ is 1 or -1. When the adjustment factor τ is -1, When the adjustment factor τ is 1, s up-s With s down-s Customizable by the user.

[0090] In this embodiment, the width of the vortex generator of the vortex flowmeter is adaptively designed using the above logic formula, so that the vortex generators of the two sets of vortex flowmeters deployed in the fluid transmission pipeline can serve the vortex flowmeters with different specifications, realize the acquisition of fluid vortex signals, and thus ensure the stable and effective execution of the method in Embodiment 1.

[0091] like Figure 1 As shown, when performing the evaluation operation, the fluid transmission stability of the fluid transmission pipeline is evaluated by acquiring the stored fluid vortex signal based on the stored time sequence, calculating the difference between the continuous changes of the frequency signal and the voltage signal in the fluid vortex signal, setting a stability evaluation threshold, and comparing the calculated difference with the stability judgment threshold to evaluate whether the fluid transmission of the current fluid transmission pipeline is stable.

[0092] The above settings provide a specified evaluation logic for assessing the stability of fluid transmission in the fluid transmission pipeline in Example 1, thereby enabling further application of the fluid vortex signal detected by the vortex flowmeter, allowing the method in Example 1 to be better applied to the fluid transmission task in the fluid transmission pipeline.

[0093] In summary, the method described in the above embodiments provides intelligent calibration conditions for the final detection of vortex signals by deploying two sets of vortex flowmeters on the fluid transmission pipeline. During the deployment phase of the vortex flowmeters, the deployment is configured with specific logic based on the flow direction characteristics of the fluid and the transmission pipeline, enabling the deployed vortex flowmeters to detect the most representative fluid vortex signals. Furthermore, fluid vortex signal detection logic is set to detect and select fluid vortex signals at a specified frequency. Finally, weights are assigned to the detected fluid vortex signals, and calibration is performed based on these weights. This allows the fluid vortex signals detected by the vortex flowmeters to be calibrated as described above. The stability of the fluid transmitted through the fluid transmission pipeline is then evaluated using the calibrated fluid vortex signals obtained through this method.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calibrating the vortex signal of a vortex flowmeter, characterized in that, include: Two sets of vortex flow meters are deployed on the fluid transmission pipeline. The widths of the vortex generators of the two sets of vortex flow meters are 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline, respectively. When the fluid is transmitted in the fluid transmission pipeline, the two sets of vortex flow meters deployed on the fluid transmission pipeline are used to measure the vortex signal of the fluid. When the fluid is being transported in the fluid transmission pipeline, the pumping pressure at the fluid pumping end is obtained. The operating frequency of the vortex flow meter is set based on the pumping pressure at the fluid pumping end. The vortex flow meter is then used to operate at the set operating frequency to measure the vortex signal of the fluid passing through the vortex flow meter in the fluid transmission pipeline. The system acquires the fluid vortex signal measured by the vortex flow meter, identifies the source of the fluid vortex signal as the vortex flow meter, distinguishes the acquired fluid vortex signal based on the identification result, configures the weights of the two sets of fluid vortex signals to be distinguished, and performs fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals. Continuously acquire and store fluid vortex signals after calibration, and evaluate the fluid transmission stability of the current fluid transmission pipeline based on the stored fluid vortex signals; The fluid vortex signal includes a frequency signal and a voltage signal. Fluid vortex signal Each is integrated from a set of frequency signals and a set of voltage signals; The operation of configuring the weights of the fluid vortex shedding signal, i.e., the operation of weighting the fluid vortex shedding signal. Fluid vortex signal Configuration of mid-frequency signal weights and voltage signal weights; The configuration logic for the fluid vortex shedding signal weights is expressed as follows: ； In the formula: , For fluid vortex shedding signal Fluid vortex signal Weighting of mid-frequency signals and fluid vortex signals Fluid vortex signal Weighting is applied to medium voltage signals; The total number of pumping pressure sensing operations at the fluid pumping end; The pumping pressure value at the pumping end of the fluid is sensed for the vth time. Normalization factor; in, Table Find the mean. Table To achieve the averaging effect, a pressure sensor is installed at the fluid pressure pumping end. Based on the pressure sensor, the pumping pressure of the fluid pumped at the fluid pressure pumping end is sensed at a specified period, and a normalization factor is applied. ∈ (0, 1); The operation for calibrating the fluid vortex shedding signal is as follows: ； In the formula: The frequency signal in the fluid vortex shear signal; The voltage signal in the fluid vortex shear signal; For fluid vortex shedding signal Medium frequency signals; For fluid vortex shedding signal Medium frequency signals; For fluid vortex shedding signal Medium voltage signal; For fluid vortex shedding signal Medium voltage signal; Among them, the frequency signal represents the frequency value of vortex generation when the fluid flows through the vortex generator, and the voltage signal represents the voltage fluctuation value generated by the sensor on the vortex flowmeter when the fluid pressure fluctuation acts on the sensor during the vortex generation stage when the fluid flows through the vortex generator.

2. The vortex flow meter vortex signal calibration method according to claim 1, characterized in that, The two sets of vortex flow meters are deployed on the fluid transmission pipeline as follows: the total length of the fluid transmission pipeline is measured, and the vortex flow meters are deployed at a distance of one-quarter of the total length of the fluid transmission pipeline from one end to the other. When the fluid transmission pipeline is a straight pipeline, the deployment position of the vortex flow meter is determined based on the above logic; when the fluid transmission pipeline is a bent pipeline, after determining the deployment position of the vortex flow meter based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two sets of vortex flow meters relative to the bend position of the fluid transmission pipeline, and the bend angle of the fluid transmission pipeline are further obtained, and the deployment position of the vortex flow meter is adjusted based on the transmission direction, path length, and bend angle. There is at most one bend in the local fluid transmission pipe between the two sets of vortex flowmeters.

3. The vortex flow meter vortex signal calibration method according to claim 2, characterized in that, When the fluid transmission pipeline is a bend, the adjustment logic for the deployment location of the vortex flowmeter is expressed as follows: ； In the formula: Deployment offset for the upstream vortex flow meter; Deployment offset for downstream vortex flowmeters; For adjustment factors; This is the total length of the fluid transmission pipeline; The path length from the downstream vortex flow meter deployment location to the bend angle of the fluid transmission pipeline; The bending angle of the fluid transmission pipeline; Among them, adjustment factor >1, and control Always less than , Table constraint functions, fluid transmission pipe bending angle ≥90, When =0, =1, When >0, = , Table constraint functions, When >1, = , When ≤1, =1, the unit of measurement for the length of fluid transmission pipelines is meters.

4. The vortex flow meter vortex signal calibration method according to claim 3, characterized in that, Upstream vortex flow meter deployment location offset and the offset of the downstream vortex flow meter deployment location After obtaining the values, the deployment positions of the corresponding vortex flow meters are offset based on the two sets of offsets. When the two sets of vortex flow meters are offset, the offset states are offsets that move away from each other along the fluid transmission path of the fluid transmission pipeline. The width of the vortex generator of the upstream vortex flow meter is 1 / 10 of the inner diameter of the fluid transmission pipe, while the width of the vortex generator of the downstream vortex flow meter is set based on the width setting logic.

5. The vortex flow meter vortex signal calibration method according to claim 4, characterized in that, The width of the vortex generator in the downstream vortex flow meter is set using the following width setting logic: ； In the formula: The set width of the vortex generator for the downstream vortex flow meter; The diameter of the fluid transmission pipe at the deployment location of the downstream vortex flow meter; The diameter of the fluid transmission pipe at the deployment location of the upstream vortex flow meter; The ratio of the width of the vortex generator to the inner diameter of the fluid transport pipe; The fluid transfer pipeline at the location of the upstream vortex flow meter is used to transfer the target flow velocity of the fluid. The downstream vortex flow meter is deployed in a fluid transmission pipeline to transmit the target flow velocity of the fluid. For adjustment factors; in, In the case of a straight fluid transmission pipe, The value is 1 / 20. The value is "+" when the fluid transmission pipe is a bent pipe. The value is 1 / 15. "Value is "-", adjustment factor The value can be 1 or -1. > When, adjust factor The value is -1. ≤ When, adjust factor The value is 1. and Customizable by the user.

6. The vortex flow meter vortex signal calibration method according to claim 1, characterized in that, The operating frequency of the vortex flowmeter is set according to the following principle: the higher the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flowmeter; conversely, the lower the pumping pressure at the fluid pumping end, the higher the operating frequency of the vortex flowmeter. The vortex flowmeter operates based on a user-defined time threshold. Under the constraints of the user-defined time threshold and the set operating frequency, the vortex flowmeter operates at least three times. The sum and average of the earliest and most recent fluid vortex signals are recorded as the fluid vortex signal currently being measured by the vortex flowmeter. Furthermore, when distinguishing the fluid vortex signals based on their source, the two distinguished sets of fluid vortex signals are recorded as the fluid vortex signals. Fluid vortex signal ; Among them, fluid vortex shedding signal The fluid vortex signal always originates from the downstream vortex flow meter. It always originates from the upstream vortex flow meter.

7. The vortex flow meter vortex signal calibration method according to claim 1, characterized in that, When evaluating the stability of fluid transport in the current fluid transport pipeline, the system acquires the stored fluid vortex signal based on the stored time sequence, calculates the difference between the continuous changes of the frequency and voltage signals in the fluid vortex signal, sets a stability evaluation threshold, and evaluates whether the fluid transport in the current fluid transport pipeline is stable by comparing the calculated difference with the stability judgment threshold.

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