Vortex street flowmeter vortex street signal calibration method

Abstract

The invention relates to the technical field of vortex shedding flowmeters, in particular to a vortex shedding flowmeter vortex shedding signal calibration method which comprises the steps that two sets of vortex shedding flowmeters are deployed on a fluid transmission pipeline, the widths of vortex generating bodies of the two sets of vortex shedding flowmeters are 1 / 10 and 1 / 20-1 / 15 of the inner diameter of the fluid transmission pipeline respectively, and when the fluid transmission pipeline transmits fluid, the vortex generating bodies of the two sets of vortex shedding flowmeters are arranged on the fluid transmission pipeline. Based on two groups of vortex shedding flowmeters deployed on a fluid transmission pipeline, the two groups of vortex shedding flowmeters are used for respectively metering vortex shedding signals of fluid; when the fluid transmission pipeline operates to transmit fluid, the pumping pressure of the fluid pumping end is obtained, the operation frequency of the vortex shedding flowmeter is set based on the pumping pressure of the fluid pumping end, the vortex shedding flowmeter operates based on the set operation frequency, and a vortex shedding signal of the fluid passing through the vortex shedding flowmeter in the fluid transmission pipeline is metered; according to the method, two groups of vortex shedding flowmeters are arranged on the fluid transmission pipeline, so that intelligent calibration conditions are provided for final detection of vortex shedding signals of the vortex shedding flowmeters.

Description

Technical Field

[0001] The invention relates to the technical field of vortex flowmeters, and in particular to a vortex signal calibration method for a vortex flowmeter. Background Art

[0002] Vortex flowmeter is an instrument used to measure the flow rate of medium fluid. It is mainly used for flow measurement of various media such as gas, liquid, steam, etc. in industrial pipelines.

[0003] The invention patent with application number 201810480013.1 discloses a thermal vortex flow metering device, comprising a measuring pipe (1), characterized in that it also comprises a vortex generator (2) for causing the fluid to be measured to generate a regular vortex signal, the vortex generator (2) being located in the measuring pipe (1), the vortex generator (2) being provided with a flow channel (3) for the fluid to pass through, the flow channel (3) being provided with a sensor for detecting the vortex frequency, the sensor being a thermal sensor (4), the vortex generator (2) being 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) being a triangle or a trapezoid.

[0004] The application aims to solve the following problems: "1. The measuring range of the traditional vortex flowmeter is 1:20, in which piezoelectric crystals are used as sensors. During the measurement of the vortex frequency by the piezoelectric crystals, if the flow rate of the fluid is less than 5m / s and the flow rate is too small, the vortex passing through the sensor will be so small that it is difficult to capture, and the traditional vortex flowmeter cannot perform measurements. 2. During the installation process, the traditional vortex flowmeter has high requirements for the straight pipe section upstream of the flowmeter, and the installation conditions may not be met during installation, which limits the application of vortex flowmeters in many occasions. 3. The sensor in the vortex flowmeter is fixedly installed downstream of the cylindrical vortex generator. When the measuring pipeline vibrates axially along the pipeline, the sensor in the pipeline will move relative to the fluid in the pipeline under the drive of the pipeline. At this time, the piezoelectric product will misjudge the relative motion as a flow signal, affecting the measurement accuracy of the flowmeter."

[0005] However, during use, the current vortex flowmeter is subject to dynamic changes such as the transmission pressure of the fluid in the connecting pipeline, resulting in certain errors in the vortex signal it detects. The existing vortex signal calibration technology relies heavily on the prior data of vortex signal detection.

[0006] Therefore, we proposed a vortex signal calibration method for vortex flowmeter. Summary of the invention

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

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A vortex flowmeter vortex signal calibration method, comprising:

[0010] Two groups of vortex flowmeters are deployed on the fluid transmission pipeline, and the widths of the vortex generators of the two groups of vortex flowmeters are respectively 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline. When the fluid transmission pipeline transmits the fluid, based on the two groups of vortex flowmeters deployed on the fluid transmission pipeline, the two groups of vortex flowmeters are used to measure the vortex signals of the fluid respectively;

[0011] When the fluid transmission pipeline is running to transmit the fluid, the pumping pressure at the fluid pumping end is obtained, the operating frequency of the vortex flowmeter is set based on the pumping pressure at the fluid pumping end, the vortex flowmeter is operated based on the set operating frequency, and the vortex signal of the fluid passing through the vortex flowmeter in the fluid transmission pipeline is measured;

[0012] Acquire the fluid vortex signal measured by the vortex flowmeter, identify the vortex flowmeter from which the fluid vortex signal comes, distinguish the acquired fluid vortex signal based on the identification result, configure the weights of the two sets of distinguished fluid vortex signals, and perform the fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals;

[0013] The fluid vortex signals of the completed calibration operation are continuously acquired and stored, and the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated based on the stored fluid vortex signals.

[0014] Furthermore, the two groups of vortex flowmeters are deployed on the fluid transmission pipeline at the following positions: the total length of the fluid transmission pipeline is measured, and the vortex flowmeters are deployed at a distance of one quarter of the total length of the fluid transmission pipeline from both ends of the fluid transmission pipeline to the other end;

[0015] When the fluid transmission pipeline is a straight pipeline, the deployment position of the vortex flowmeter is determined based on the above logic; when the fluid transmission pipeline is a bent pipeline, after the deployment position of the vortex flowmeter is determined based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two determined deployment positions of the vortex flowmeters relative to the bent position of the fluid transmission pipeline, and the bending angle of the fluid transmission pipeline are further obtained, and the deployment position of the vortex flowmeter is adjusted based on the transmission direction, path length and bending angle;

[0016] There is at most only one set of bending positions on the local fluid transmission pipeline between the two sets of vortex flowmeters.

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

[0018]

[0019] Where: L up-s The upstream vortex flowmeter deployment position offset; L down-s is the offset of the downstream vortex flowmeter deployment position; θ is the adjustment factor; L0 is the total length of the fluid transmission pipeline; L is the path length from the downstream vortex flowmeter deployment position to the bending angle of the fluid transmission pipeline; A is the bending angle of the fluid transmission pipeline;

[0020] Among them, the adjustment factor θ>1, and the control L up-s Always less than L down-s , f(|A-90|) represents the constraint function, the bending angle A of the fluid transmission pipeline is ≥90, when |A-90|=0, f(|A-90|)=1, when |A-90|>0, f(|A-90|)=|A-90|, y[|L|×f(|A-90|)] represents the constraint function, when |L|×f(|A-90|)>1, y[|L|×f(|A-90|)]=|L|×f(|A-90|), when |L|×f(|A-90|)≤1, y[|L|×f(|A-90|)]=1, and the unit of measurement for the length of the fluid transmission pipeline is meter.

[0021] Furthermore, the upstream vortex flowmeter deployment position offset L up-s and the downstream vortex flowmeter deployment position offset L down-s After the calculation, the corresponding vortex flowmeters are offset in their deployment positions based on the two groups of offsets. When the two groups of vortex flowmeters are offset in their deployment positions, the offset states are offsets of the fluid transmission paths along the fluid transmission pipelines away from each other.

[0022] The width of the vortex generator of the upstream vortex flowmeter is 1 / 10 of the inner diameter of the fluid transmission pipeline, and the width of the vortex generator of the downstream vortex flowmeter is set based on the width setting logic.

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

[0024]

[0025] Where: w is the set width of the vortex generator of the downstream vortex flowmeter; d down-s The diameter of the fluid transmission pipeline where the downstream vortex flowmeter is deployed; d up-s is the diameter of the fluid transmission pipeline at the upstream vortex flowmeter deployment location; k is the ratio of the width of the vortex generator to the inner diameter of the fluid transmission pipeline; s up-s The target flow rate of the fluid in the fluid transmission pipeline at the upstream vortex flowmeter deployment location; s down-sis the target flow rate of the fluid transmitted by the fluid transmission pipeline at the downstream vortex flowmeter deployment location; τ is the adjustment factor;

[0026] in, In the equation, when the fluid transmission pipeline is a straight pipeline, k is 1 / 20, and “±” is “+”; when the fluid transmission pipeline is a curved pipeline, k is 1 / 15, and “±” is “-”. The adjustment factor τ is 1 or -1. When , the adjustment factor τ takes the value of -1. When the adjustment factor τ takes the value of 1, s up-s With s down-s Customized by the user.

[0027] Furthermore, the setting of the operating frequency of the vortex flowmeter is subject to: the greater the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flowmeter, and vice versa, the smaller 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. When the vortex flowmeter operates under the limited conditions of the user-defined time threshold and the set operating frequency, the vortex flowmeter operates no less than three times. The sum and average of the earliest measured fluid vortex signal and the most recently measured fluid vortex signal are recorded as the fluid vortex signal currently measured by the vortex flowmeter. When the fluid vortex signal is further distinguished based on the source of the fluid vortex signal, the two groups of distinguished fluid vortex signals are recorded as fluid vortex signal α and fluid vortex signal β.

[0028] Among them, the fluid vortex signal α always comes from the downstream vortex flowmeter, and the fluid vortex signal β always comes from the upstream vortex flowmeter.

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

[0030] The operation of configuring the fluid vortex signal weight is to configure the frequency signal weight and the voltage signal weight in the fluid vortex signal α and the fluid vortex signal β.

[0031] Furthermore, the configuration logic of the fluid vortex signal weight is expressed as:

[0032]

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

[0034] in, Table pair The average, Table pair The fluid pressure pumping end is provided with a pressure sensor, and the pressure sensor senses the pumping pressure of the fluid pumped by the fluid pressure pumping end at a specified period, and the normalization factor σ∈(0, 1) is used.

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

[0036]

[0037] Where: P is the frequency signal in the fluid vortex signal; V is the voltage signal in the fluid vortex signal; p α is the frequency signal of the fluid vortex signal α; p β is the medium frequency signal of the fluid vortex signal β; v α is the voltage signal in the fluid vortex signal α; v β is the voltage signal in the fluid vortex signal β;

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

[0039] Furthermore, when the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated, the stored fluid vortex signal is obtained based on the storage time sequence, the continuous change difference of the frequency signal and the voltage signal in the fluid vortex signal is calculated, and the stability evaluation threshold is set. Based on the comparison between the calculated difference and the stability judgment threshold, it is evaluated whether the fluid transmitted by the current fluid transmission pipeline is stable.

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

[0041] Beneficial effects:

[0042] The present invention provides a vortex signal calibration method for a vortex flowmeter. During the execution of the method, two groups of vortex flowmeters are deployed on a fluid transmission pipeline to provide intelligent calibration conditions for the final detection vortex signal of the vortex flowmeter.

[0043] During the vortex flowmeter deployment stage, the vortex flowmeter is deployed and configured with a specific logic in combination with the flow direction characteristics of the fluid and the transmission pipeline, so that the deployed vortex flowmeter can detect the most representative fluid vortex signal. The fluid vortex signal detection logic is further set to detect and select the fluid vortex signal at a specified frequency. Finally, a weight is configured for the detected fluid vortex signal, and the fluid vortex signal is calibrated in combination with the configured weight, so that the fluid vortex signal detected by the vortex flowmeter can be calibrated based on the above, and the stability of the fluid transmitted by the fluid transmission pipeline is evaluated based on the fluid vortex signal obtained by the calibration using the calibrated fluid vortex signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic diagram of a flow chart of a vortex signal calibration method for a vortex flowmeter;

[0046] Figure 2 It is a schematic diagram showing the deployment logic of the vortex flowmeter in the present invention;

[0047] Figure 3 For the present invention Figure 2 Schematic diagram of further adjustment of the vortex flowmeter deployment position in Figure (b);

[0048] Figure 4 It is a schematic diagram of the structure of the vortex flowmeter in the present invention;

[0049] Figure 5 It is a schematic diagram of the flow state of the fluid in the fluid transmission pipeline of the present invention being affected by the vortex generating body. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] The present invention will be further described below in conjunction with the embodiments.

[0052] Embodiment 1:

[0053] A vortex signal calibration method for a vortex flowmeter in this embodiment is as follows: Figure 1 As shown, including:

[0054] Two groups of vortex flowmeters are deployed on the fluid transmission pipeline. The widths of the vortex generating bodies of the two groups of vortex flowmeters 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 groups of vortex flowmeters are deployed on the fluid transmission pipeline to measure the vortex signals of the fluid respectively.

[0055] When the fluid transmission pipeline is running to transmit the fluid, the pumping pressure at the fluid pumping end is obtained, the operating frequency of the vortex flowmeter is set based on the pumping pressure at the fluid pumping end, the vortex flowmeter is operated based on the set operating frequency, and the vortex signal of the fluid passing through the vortex flowmeter in the fluid transmission pipeline is measured;

[0056] The setting of the operating frequency of the vortex flowmeter is subject to: the greater the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flowmeter; conversely, the smaller the pumping pressure at the fluid pumping end, the higher the operating frequency of the vortex flowmeter; the vortex flowmeter operates based on the user-defined time threshold; when the vortex flowmeter operates under the limited conditions of the user-defined time threshold and the set operating frequency, the vortex flowmeter operates no less than three times; the sum of the earliest measured fluid vortex signal and the most recently measured fluid vortex signal and then the average result is recorded as the fluid vortex signal currently measured by the vortex flowmeter; further, when the fluid vortex signal is distinguished based on the source of the fluid vortex signal, the two groups of distinguished fluid vortex signals are recorded as fluid vortex signal α and fluid vortex signal β;

[0057] Among them, the fluid vortex signal α always comes from the downstream vortex flowmeter, and the fluid vortex signal β always comes from the upstream vortex flowmeter;

[0058] The fluid vortex signal includes a frequency signal and a voltage signal. The fluid vortex signal α and the fluid vortex signal β are both integrated by a set of frequency signals and a set of voltage signals.

[0059] The operation of configuring the fluid vortex signal weight, that is, configuring the frequency signal weight and voltage signal weight in the fluid vortex signal α and the fluid vortex signal β;

[0060] The configuration logic of the fluid vortex signal weight is expressed as:

[0061]

[0062] Where: ω1, ω2 are the application weights of the frequency signal in the fluid vortex signal α and the fluid vortex signal β, and the application weights of the voltage signal in the fluid vortex signal α and the fluid vortex signal β; u is the total number of times the pumping pressure is sensed at the fluid pumping end; p vis the pumping pressure value of the pumping end of the vth sensing fluid; σ is the normalization factor;

[0063] in, Table pair The average, Table pair The fluid pressure pumping end is provided with a pressure sensor, and the pressure sensor senses the pumping pressure of the fluid pumped by the fluid pressure pumping end at a specified period, and the normalization factor σ∈(0,1);

[0064] The operation of fluid vortex signal calibration is:

[0065]

[0066] Where: P is the frequency signal in the fluid vortex signal; V is the voltage signal in the fluid vortex signal; p α is the frequency signal of the fluid vortex signal α; p β is the medium frequency signal of the fluid vortex signal β; v α is the voltage signal in the fluid vortex signal α; v β is the voltage signal in the fluid vortex signal β;

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

[0068] Acquire the fluid vortex signal measured by the vortex flowmeter, identify the vortex flowmeter from which the fluid vortex signal comes, distinguish the acquired fluid vortex signal based on the identification result, configure the weights of the two sets of distinguished fluid vortex signals, and perform the fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals;

[0069] The fluid vortex signals of the completed calibration operation are continuously acquired and stored, and the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated based on the stored fluid vortex signals.

[0070] In this embodiment, by executing the method in the above embodiment, two groups of vortex flowmeters are deployed simultaneously to realize the calibration of the vortex signal of the vortex flowmeter operation detection, effectively improving the accuracy of the vortex signal of the vortex flowmeter operation detection in the vortex flowmeter usage scenario, making the vortex signal of the vortex flowmeter operation detection more reliable and more valuable for reference.

[0071] See also Figure 2 , Figure 3As shown, Figure (a) and Figure (b) represent a straight fluid transmission pipeline and a curved fluid transmission pipeline, respectively. The arrow in Figure (b) represents the direction of the transmission fluid, which is the same as the direction of the fluid in Figure (a). The black dot in the figure represents the deployment position of the vortex flowmeter. Since Figure (a) is a straight fluid transmission pipeline, the deployment position of the vortex flowmeter in Figure (a) is determined based on the deployment position design logic recorded in the embodiment. Since Figure (b) is a curved fluid transmission pipeline, the deployment position of the vortex flowmeter is further adjusted based on the deployment position design logic recorded in the embodiment. The specific adjustment results are as follows: Figure 3 Displayed in.

[0072] Embodiment 2:

[0073] In terms of specific implementation, based on Example 1, this example refers to Figure 1 A vortex signal calibration method for a vortex flowmeter in Example 1 is further described in detail:

[0074] The two sets of vortex flowmeters are deployed on the fluid transmission pipeline at the following positions: measuring the total length of the fluid transmission pipeline, the vortex flowmeters are deployed at a distance of one quarter of the total length of the fluid transmission pipeline from both ends of the fluid transmission pipeline to the other end;

[0075] When the fluid transmission pipeline is a straight pipeline, the deployment position of the vortex flowmeter is determined based on the above logic; when the fluid transmission pipeline is a bent pipeline, after the deployment position of the vortex flowmeter is determined based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two determined deployment positions of the vortex flowmeters relative to the bent position of the fluid transmission pipeline, and the bending angle of the fluid transmission pipeline are further obtained, and the deployment position of the vortex flowmeter is adjusted based on the transmission direction, path length and bending angle;

[0076] Among them, there is at most only one set of bending positions on the local fluid transmission pipeline between the two sets of vortex flowmeters;

[0077] When the fluid transmission pipeline is a curved pipeline, the adjustment logic for the deployment position of the vortex flowmeter is expressed as follows:

[0078]

[0079] Where: L up-s The upstream vortex flowmeter deployment position offset; L down-s is the offset of the downstream vortex flowmeter deployment position; θ is the adjustment factor; L0 is the total length of the fluid transmission pipeline; L is the path length from the downstream vortex flowmeter deployment position to the bending angle of the fluid transmission pipeline; A is the bending angle of the fluid transmission pipeline;

[0080] Among them, the adjustment factor θ>1, and the control L up-s Always less than Ldown-s , f(|A-90|) represents the constraint function, the bending angle A of the fluid transmission pipeline is ≥90, when |A-90|=0, f(|A-90|)=1, when |A-90|>0, f(|A-90|)=|A-90|, y[|L|×f(|A-90|)] represents the constraint function, when |L|×f(|A-90|)>1, y[|L|×f(|A-90|)]=|L|×f(|A-90|), when |L|×f(|A-90|)≤1, y[|L|×f(|A-90|)]=1, and the unit of measurement for the length of the fluid transmission pipeline is meter.

[0081] like Figure 1 As shown, the upstream vortex flowmeter deployment position offset L up-s and the downstream vortex flowmeter deployment position offset L down-s After the calculation, the corresponding vortex flowmeters are offset in their deployment positions based on the two groups of offsets. When the two groups of vortex flowmeters are offset in their deployment positions, the offset states are offsets of the fluid transmission paths along the fluid transmission pipelines away from each other.

[0082] The width of the vortex generator of the upstream vortex flowmeter is 1 / 10 of the inner diameter of the fluid transmission pipeline, and the width of the vortex generator of the downstream vortex flowmeter is set based on the width setting logic.

[0083] Through the above settings, further step execution data support is provided for the execution of the steps of the method in Example 1. At the same time, the adjustment logic of the deployment position of the vortex flowmeter is further limited by a logical formula to ensure that the vortex flowmeter can obtain accurate and effective deployment position configuration based on the above settings to realize the deployment of the vortex flowmeter. The vortex signal is detected by running the vortex flowmeter to provide data support for the further execution of the method in Example 1.

[0084] Embodiment 3:

[0085] In terms of specific implementation, based on Example 1, this example refers to Figure 1 A vortex signal calibration method for a vortex flowmeter in Example 1 is further described in detail:

[0086] When setting the width of the vortex generator of the downstream vortex flowmeter, the width setting logic applied is expressed as follows:

[0087]

[0088] Where: w is the set width of the vortex generator of the downstream vortex flowmeter; d down-s The diameter of the fluid transmission pipeline where the downstream vortex flowmeter is deployed; d up-sis the diameter of the fluid transmission pipeline at the upstream vortex flowmeter deployment location; k is the ratio of the width of the vortex generator to the inner diameter of the fluid transmission pipeline; s up-s The target flow rate of the fluid in the fluid transmission pipeline at the upstream vortex flowmeter deployment location; s down-s is the target flow rate of the fluid transmitted by the fluid transmission pipeline at the downstream vortex flowmeter deployment location; τ is the adjustment factor;

[0089] in, In the equation, when the fluid transmission pipeline is a straight pipeline, k is 1 / 20, and “±” is “+”; when the fluid transmission pipeline is a curved pipeline, k is 1 / 15, and “±” is “-”. The adjustment factor τ is 1 or -1. When , the adjustment factor τ takes the value of -1. When the adjustment factor τ takes the value of 1, s up-s With s down-s Customized by the user.

[0090] In this embodiment, the width of the vortex generator of the vortex flowmeter is adaptively designed through the above-mentioned logical formula, so that the vortex generators of the two groups of vortex flowmeters deployed in the fluid transmission pipeline can serve the vortex flowmeter with different specifications, thereby realizing the collection of fluid vortex signals, thereby ensuring the stable and effective execution of the method in Example 1.

[0091] like Figure 1 As shown, when the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated, the stored fluid vortex signal is obtained based on the storage time sequence, the continuous change difference of the frequency signal and the voltage signal in the fluid vortex signal is calculated, and the stability evaluation threshold is set. Based on the comparison between the calculated difference and the stability judgment threshold, it is evaluated whether the fluid transmitted by the current fluid transmission pipeline is stable.

[0092] Through the above settings, a specified evaluation logic is provided for the evaluation of whether the fluid transmission in the fluid transmission pipeline is stable in Example 1, so that the fluid vortex signal of the vortex flowmeter operation detection is further applied, so that the method in Example 1 can be better applied to the fluid transmission task of the fluid transmission pipeline.

[0093] In summary, during the execution of the method in the above embodiment, by deploying two groups of vortex flowmeters on the fluid transmission pipeline, intelligent calibration conditions are provided for the final detection vortex signal of the vortex flowmeter; in the vortex flowmeter deployment stage, the deployment configuration of the vortex flowmeter is configured with a specific logic in combination with the flow direction characteristics of the fluid and the transmission pipeline, so that the deployed vortex flowmeter can detect the most representative fluid vortex signal, and further set the fluid vortex signal detection logic so that the fluid vortex signal is detected and selected at a specified frequency, and finally the detected fluid vortex signal is configured with a weight, and then the calibration of the fluid vortex signal is performed in combination with the configured weight, so that the fluid vortex signal detected by the vortex flowmeter is calibrated based on the above, and the stability of the fluid transmitted by the fluid transmission pipeline is evaluated based on the fluid vortex signal obtained by the calibration of the fluid vortex signal using the method.

[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements 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 vortex flowmeter vortex signal calibration method, characterized in that: include: Two groups of vortex flowmeters are deployed on the fluid transmission pipeline, and the widths of the vortex generators of the two groups of vortex flowmeters are respectively 1 / 10 and 1 / 20 to 1 / 15 of the inner diameter of the fluid transmission pipeline. When the fluid transmission pipeline transmits the fluid, based on the two groups of vortex flowmeters deployed on the fluid transmission pipeline, the two groups of vortex flowmeters are used to measure the vortex signals of the fluid respectively; When the fluid transmission pipeline is running to transmit the fluid, the pumping pressure at the fluid pumping end is obtained, the operating frequency of the vortex flowmeter is set based on the pumping pressure at the fluid pumping end, the vortex flowmeter is operated based on the set operating frequency, and the vortex signal of the fluid passing through the vortex flowmeter in the fluid transmission pipeline is measured; Acquire the fluid vortex signal measured by the vortex flowmeter, identify the vortex flowmeter from which the fluid vortex signal comes, distinguish the acquired fluid vortex signal based on the identification result, configure the weights of the two sets of distinguished fluid vortex signals, and perform the fluid vortex signal calibration operation based on the configured weights and the two sets of fluid vortex signals; The fluid vortex signals of the completed calibration operation are continuously acquired and stored, and the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated based on the stored fluid vortex signals.

2. A vortex signal calibration method for a vortex flowmeter according to claim 1, characterized in that: The two groups of vortex flowmeters are deployed on the fluid transmission pipeline at the following positions: measuring the total length of the fluid transmission pipeline, and deploying the vortex flowmeters at a distance of one quarter of the total length of the fluid transmission pipeline from both ends of the fluid transmission pipeline to the other end; When the fluid transmission pipeline is a straight pipeline, the deployment position of the vortex flowmeter is determined based on the above logic; when the fluid transmission pipeline is a bent pipeline, after the deployment position of the vortex flowmeter is determined based on the above logic, the fluid transmission direction inside the fluid transmission pipeline, the path length of the two determined deployment positions of the vortex flowmeters relative to the bent position of the fluid transmission pipeline, and the bending angle of the fluid transmission pipeline are further obtained, and the deployment position of the vortex flowmeter is adjusted based on the transmission direction, path length and bending angle; There is at most only one set of bending positions on the local fluid transmission pipeline between the two sets of vortex flowmeters.

3. A vortex signal calibration method for a vortex flowmeter according to claim 2, characterized in that: When the fluid transmission pipeline is a curved pipeline, the adjustment logic for the deployment position of the vortex flowmeter is expressed as follows: Where: L up-s The upstream vortex flowmeter deployment position offset; L down-s is the offset of the downstream vortex flowmeter deployment position; θ is the adjustment factor; L0 is the total length of the fluid transmission pipeline; L is the path length from the downstream vortex flowmeter deployment position to the bending angle of the fluid transmission pipeline; A is the bending angle of the fluid transmission pipeline; Among them, the adjustment factor θ>1, and the control L up-s Always less than L down-s , f(|A-90|) represents the constraint function, the bending angle A of the fluid transmission pipeline is ≥90, when |A-90|=0, f(|A-90|)=1, when |A-90|>0, f(|A-90|)=|A-90|, y[L|×f(|A-90|)] represents the constraint function, when |L|×f(|A-90|)>1, y[|L|×f(|A-90|)]=|L|×f(|A-90|), when |L|×f(|A-90|)≤1, y[|L|×f(|A-90|)]=1, and the unit of measurement for the length of the fluid transmission pipeline is meter.

4. A vortex signal calibration method for a vortex flowmeter according to claim 1 or 3, characterized in that: Upstream vortex flowmeter deployment position offset L up-s and the downstream vortex flowmeter deployment position offset L down-s After the calculation, the corresponding vortex flowmeters are offset in their deployment positions based on the two groups of offsets. When the two groups of vortex flowmeters are offset in their deployment positions, the offset states are offsets of the fluid transmission paths along the fluid transmission pipelines away from each other. The width of the vortex generator of the upstream vortex flowmeter is 1 / 10 of the inner diameter of the fluid transmission pipeline, and the width of the vortex generator of the downstream vortex flowmeter is set based on the width setting logic.

5. A vortex signal calibration method for a vortex flowmeter according to claim 4, characterized in that: When the width of the vortex generator of the downstream vortex flowmeter is set, the width setting logic applied is expressed as follows: Where: w is the set width of the vortex generator of the downstream vortex flowmeter; d down-s The diameter of the fluid transmission pipeline where the downstream vortex flowmeter is deployed; d up-s is the diameter of the fluid transmission pipeline at the upstream vortex flowmeter deployment location; k is the ratio of the width of the vortex generator to the inner diameter of the fluid transmission pipeline; s up-s The target flow rate of the fluid in the fluid transmission pipeline at the upstream vortex flowmeter deployment location; s down-s is the target flow rate of the fluid transmitted by the fluid transmission pipeline at the downstream vortex flowmeter deployment location; τ is the adjustment factor; in, In the equation, when the fluid transmission pipeline is a straight pipeline, k is 1 / 20, "±" is "+", when the fluid transmission pipeline is a curved pipeline, k is 1 / 15, "±" is "-", and the adjustment factor τ is 1 or -1. When , the adjustment factor τ takes the value of -1. When the adjustment factor τ takes the value of 1, s up-s With s down-s Customized by the user.

6. A vortex signal calibration method for a vortex flowmeter according to claim 1, characterized in that: The setting of the operating frequency of the vortex flowmeter is subject to: the greater the pumping pressure at the fluid pumping end, the lower the operating frequency of the vortex flowmeter, and vice versa, the smaller 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. When the vortex flowmeter operates under the limited conditions of the user-defined time threshold and the set operating frequency, the vortex flowmeter operates no less than three times. The sum and average of the earliest measured fluid vortex signal and the most recently measured fluid vortex signal are recorded as the fluid vortex signal currently measured by the vortex flowmeter. When the fluid vortex signal is further distinguished based on the source of the fluid vortex signal, the two groups of distinguished fluid vortex signals are recorded as fluid vortex signal α and fluid vortex signal β. Among them, the fluid vortex signal α always comes from the downstream vortex flowmeter, and the fluid vortex signal β always comes from the upstream vortex flowmeter.

7. A vortex signal calibration method for a vortex flowmeter according to claim 1, characterized in that: The fluid vortex signal includes a frequency signal and a voltage signal, and the fluid vortex signal α and the fluid vortex signal β are both integrated by a group of frequency signals and a group of voltage signals; The operation of configuring the fluid vortex signal weight is to configure the frequency signal weight and the voltage signal weight in the fluid vortex signal α and the fluid vortex signal β.

8. A vortex signal calibration method for a vortex flowmeter according to claim 7, characterized in that: The configuration logic of the fluid vortex signal weight is expressed as: Where: ω1, ω2 are the application weights of the frequency signal in the fluid vortex signal α and the fluid vortex signal β, and the application weights of the voltage signal in the fluid vortex signal α and the fluid vortex signal β; u is the total number of times the pumping pressure is sensed at the fluid pumping end; p v is the pumping pressure value of the pumping end of the vth sensing fluid; σ is the normalization factor; in, Table pair The average, Table pair The fluid pressure pumping end is provided with a pressure sensor, and the pressure sensor senses the pumping pressure of the fluid pumped by the fluid pressure pumping end at a specified period, and the normalization factor σ∈(0, 1) is used.

9. A vortex signal calibration method for a vortex flowmeter according to claim 1 or 8, characterized in that: The operation of the fluid vortex signal calibration is: Where: P is the frequency signal in the fluid vortex signal; V is the voltage signal in the fluid vortex signal; p α is the frequency signal of the fluid vortex signal α; p β is the medium frequency signal of the fluid vortex signal β; v α is the voltage signal in the fluid vortex signal α; v β is the voltage signal in the fluid vortex signal β; Among them, the frequency signal represents the frequency value of the vortex generated when the fluid flows through the vortex generator, and the voltage signal represents the vortex generation stage when the fluid flows through the vortex generator. The fluid pressure fluctuation acts on the sensor on the vortex flowmeter, resulting in the voltage fluctuation value generated by the sensor.

10. A vortex flowmeter vortex signal calibration method according to claim 1, characterized in that: When the stability of the fluid transmitted by the current fluid transmission pipeline is evaluated, the stored fluid vortex signal is obtained based on the storage time sequence, the continuous change difference of the frequency signal and the voltage signal in the fluid vortex signal is calculated, and the stability evaluation threshold is set. Based on the comparison between the calculated difference and the stability judgment threshold, it is evaluated whether the fluid transmitted by the current fluid transmission pipeline is stable.

Images