A Multi-Signal Turbine Flow Calculation Method

Abstract

This invention provides a multi-signal-based turbine flow rate calculation method, belonging to the field of turbine flow rate calculation technology. The method includes: acquiring multiple signals of the measured fluid flowing through a turbine flow meter, and calculating the initial volumetric flow rate, temperature, and pressure of the measured fluid; querying a table of physical property parameters of the measured fluid, and calculating the density and viscosity of the measured fluid based on its temperature and pressure; setting up a calibration test bench and calibration flow rate, acquiring the calibration viscosity, calculating a correction coefficient through nonlinear fitting, and constructing a volumetric flow rate correction formula; substituting the viscosity and initial volumetric flow rate of the measured fluid into the volumetric flow rate correction formula to obtain the corrected volumetric flow rate, and calculating the mass flow rate of the measured fluid based on its density. This invention solves the problem that existing turbine flow meters lack the ability to calculate density, viscosity, and mass flow rate.

Description

Technical Field

[0001] This invention belongs to the field of turbine flow calculation technology, and particularly relates to a turbine flow calculation method based on multiple signals. Background Technology

[0002] Turbine flow meters are a major type of velocity flow meter. When the fluid being measured flows through a turbine flow meter, the impeller rotates under the action of the fluid. Its rotational speed is proportional to the average flow velocity in the pipe. At the same time, the blades periodically cut the magnetic lines of force generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal, i.e. an electrical pulse signal, will be induced in the coil. The frequency of this electrical pulsation is proportional to the volumetric flow rate of the fluid being measured.

[0003] Existing turbine flow rate calculation methods can only calculate the volumetric flow rate of the fluid being measured, but cannot calculate information such as temperature, pressure, density, viscosity, and mass flow rate of the fluid being measured. Summary of the Invention

[0004] In view of the above-mentioned shortcomings in the prior art, the present invention provides a turbine flow calculation method based on multiple signals, which solves the problem that the existing turbine flow meters do not have the ability to calculate density, viscosity and mass flow rate.

[0005] To achieve the above objectives, the technical solution adopted by this invention is: a turbine flow calculation method based on multiple signals, comprising the following steps:

[0006] S1. Based on the flow of the fluid being measured through the turbine flow meter, the turbine flow meter is used to acquire multiple signals of the fluid being measured, and the multiple signals of the fluid being measured are calculated to obtain the initial volumetric flow rate, temperature and pressure of the fluid being measured.

[0007] S2. Based on the turbine flow meter, look up the physical property parameter table of the fluid being measured, and calculate the density and viscosity of the fluid being measured by combining the temperature and pressure of the fluid being measured.

[0008] S3. Set up the calibration test bench and calibration flow rate, obtain the calibration viscosity, and calculate the correction coefficient based on the initial volumetric flow rate of the fluid being tested through nonlinear fitting, and construct the volumetric flow rate correction formula.

[0009] S4. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to obtain the corrected volumetric flow rate. Combine this with the density of the fluid to be measured to calculate the mass flow rate of the fluid to be measured, thus completing the turbine flow rate calculation.

[0010] The beneficial effects of this invention are as follows: This invention calculates the initial volumetric flow rate of the fluid being measured using the impeller speed signal of a turbine flow meter, and simultaneously calculates the temperature and pressure signals output by the turbine flow meter to obtain the temperature and pressure of the fluid being measured. Based on the fluid's physical property parameter table, the density and viscosity are calculated. By calibrating the test bench and combining nonlinear fitting, a volumetric flow rate correction formula is constructed. The corrected volumetric flow rate is then multiplied by the density to obtain the mass flow rate of the fluid being measured. This invention allows for accurate measurement of the temperature, pressure, density, viscosity, and mass flow rate of the fluid being measured using a simple turbine flow meter, thus improving the turbine flow rate calculation capability.

[0011] Further, S1 includes the following steps:

[0012] S101. Based on the fluid being measured flowing through the turbine flow meter, the impeller speed signal is obtained using the turbine flow meter, and the impeller speed signal is calculated to obtain the initial volumetric flow rate of the fluid being measured.

[0013] S102. Using the temperature sensor and pressure sensor in the turbine flow meter, acquire the temperature signal and pressure signal output by the turbine flow meter, and calculate the temperature signal and pressure signal to obtain the temperature and pressure of the fluid being measured.

[0014] The beneficial effects of the above-mentioned further solutions are as follows: the present invention obtains multiple signals such as impeller speed signal, temperature signal and pressure signal by the fluid being measured flowing through the turbine flow meter, thereby realizing the data reliability of turbine flow calculation and improving calculation efficiency and accuracy.

[0015] Furthermore, step S3 includes the following steps:

[0016] S301. Set up the calibration test bench and calibration flow rate, and calibrate the turbine flow meter according to the calibration flow rate to obtain the viscosity of the fluid being measured during calibration.

[0017] S302. Based on the calibration flow rate, the initial volumetric flow rate of the fluid being measured, and the viscosity of the fluid being measured during calibration, set an initial correction formula and calculate the correction coefficient through nonlinear fitting.

[0018] S303. Based on the correction coefficient, construct the volumetric flow rate correction formula.

[0019] Furthermore, the volumetric flow rate correction formula is as follows:

[0020] ;

[0021] in, This represents the corrected volumetric flow rate. This indicates the viscosity of the fluid being measured. This indicates the initial volumetric flow rate of the fluid being measured. , , , , , as well as All of these represent correction factors.

[0022] The beneficial effects of the above-mentioned further solutions are as follows: By setting up a calibration test bench, obtaining correction coefficients, and constructing a volumetric flow rate correction formula, the present invention achieves accurate correction of the initial volumetric flow rate of the fluid being measured, thereby improving the accuracy of calculating the mass flow rate.

[0023] Furthermore, step S4 includes the following steps:

[0024] S401. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to calculate the corrected volumetric flow rate;

[0025] S402. Combining the density of the fluid being measured, multiply the corrected volumetric flow rate with the density of the fluid being measured to obtain the mass flow rate of the fluid being measured, thus completing the turbine flow rate calculation.

[0026] The beneficial effects of the above-mentioned further solutions are as follows: This invention obtains the mass flow rate of the measured fluid by multiplying the corrected volumetric flow rate with the density of the measured fluid using a volumetric flow rate correction formula. This enables accurate measurement of temperature, pressure, density, viscosity, and mass flow rate of the measured fluid using a simple turbine flow meter, providing a wide range of applications for turbine flow rate calculation. Attached Figure Description

[0027] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0028] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0029] Example

[0030] like Figure 1 As shown, this invention provides a turbine flow rate calculation method based on multiple signals, the implementation method of which is as follows:

[0031] S1. Based on the flow of the fluid being measured through the turbine flow meter, the turbine flow meter is used to acquire multiple signals of the fluid being measured, and these multiple signals are then processed to obtain the initial volumetric flow rate, temperature, and pressure of the fluid being measured. The specific steps are as follows:

[0032] S101. Based on the fluid being measured flowing through the turbine flow meter, the impeller speed signal is obtained using the turbine flow meter, and the impeller speed signal is calculated to obtain the initial volumetric flow rate of the fluid being measured.

[0033] S102. Using the temperature sensor and pressure sensor in the turbine flow meter, acquire the temperature signal and pressure signal output by the turbine flow meter, and calculate the temperature signal and pressure signal to obtain the temperature and pressure of the fluid being measured.

[0034] In this embodiment, a multi-signal-based turbine flow rate calculation method is provided, which includes the calculation of the volumetric flow rate of the measured fluid, temperature calculation, pressure calculation, density calculation, viscosity calculation, volumetric flow rate correction, and mass flow rate calculation of the measured fluid.

[0035] Based on the flow of the fluid being measured through a turbine flow meter, the impeller speed signal is acquired using the turbine flow meter, and the initial volumetric flow rate of the fluid being measured is calculated from the impeller speed signal of the turbine flow meter. Simultaneously, the temperature and pressure signals output by the turbine flow meter are acquired through the temperature and pressure sensors in the turbine flow meter, and the temperature of the measured fluid is calculated. and pressure .

[0036] S2. Based on the turbine flow meter, look up the physical property parameter table of the fluid being measured, and calculate the density and viscosity of the fluid being measured by combining the temperature and pressure of the fluid being measured.

[0037] In this embodiment, the density of the fluid being measured is calculated by consulting the physical property parameter table of the fluid being measured, which is embedded in the flow meter. and viscosity ;

[0038] Calculate density The specific steps are as follows: Based on the calculated temperature of the fluid being measured... and pressure The density of the tested fluid was calculated by consulting the solidified physical property parameter table using a two-dimensional linear interpolation method. ;

[0039] Calculate viscosity The specific steps are as follows: Based on the calculated temperature of the fluid being measured... and pressure The density of the tested fluid was calculated by consulting the solidified physical property parameter table using a two-dimensional linear interpolation method. .

[0040] S3. Set up the calibration test bench and calibration flow rate, obtain the calibration viscosity, and calculate the correction coefficient based on the initial volumetric flow rate of the fluid being tested through nonlinear fitting, and construct the volumetric flow rate correction formula. The specific steps are as follows:

[0041] S301. Set up the calibration test bench and calibration flow rate, and calibrate the turbine flow meter according to the calibration flow rate to obtain the viscosity of the fluid being measured during calibration.

[0042] S302. Based on the calibration flow rate, the initial volumetric flow rate of the fluid being measured, and the viscosity of the fluid being measured during calibration, set an initial correction formula and calculate the correction coefficient through nonlinear fitting.

[0043] S303. Based on the correction coefficient, construct the volumetric flow rate correction formula.

[0044] In this embodiment, a calibration test bench and a calibration flow rate are set up to construct the volumetric flow rate correction formula. The calibration flow rate is specifically the standard flow rate of the calibration test bench;

[0045] According to the calibrated flow rate The turbine flow meter was calibrated, and the viscosity of the fluid being measured was recorded during calibration. Based on the calibration flow rate, the initial volumetric flow rate of the fluid being measured, and the viscosity of the fluid being measured at the time of calibration, and combined with subsequent nonlinear fitting using origin function plotting software, an initial correction formula is set as follows:

[0046] ;

[0047] in, Indicates calibration flow rate, This indicates the initial volumetric flow rate of the fluid being measured. This indicates the viscosity of the fluid being measured during calibration. , , , , , as well as All of these represent correction coefficients, which are unknown parameters obtained by nonlinear fitting of the initial correction formula.

[0048] Using origin function plotting software, nonlinear fitting is performed according to the initial correction formula to calculate the specific values ​​of the correction coefficients. Based on the correction coefficients, a volumetric flow rate correction formula is constructed, as shown below:

[0049] ;

[0050] in, This represents the corrected volumetric flow rate. This indicates the viscosity of the fluid being measured. This represents the initial volumetric flow rate of the fluid being measured, and the viscosity of the fluid being measured. and the initial volumetric flow rate of the fluid being measured The parameters need to be obtained through actual measurement.

[0051] S4. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to obtain the corrected volumetric flow rate. Combine this with the density of the fluid to be measured to calculate the mass flow rate of the fluid, thus completing the turbine flow rate calculation. The specific steps are as follows:

[0052] S401. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to calculate the corrected volumetric flow rate;

[0053] S402. Combining the density of the fluid being measured, multiply the corrected volumetric flow rate with the density of the fluid being measured to obtain the mass flow rate of the fluid being measured, thus completing the turbine flow rate calculation.

[0054] In this embodiment, the viscosity of the fluid to be measured is... Substituting into the volumetric flow rate correction formula, we obtain the corrected volumetric flow rate. Then the corrected volumetric flow rate density of the fluid being measured Multiply to obtain the mass flow rate of the fluid being measured. The calculation expression is as follows:

[0055] ;

[0056] in, This indicates the mass flow rate of the fluid being measured.

Claims

1. A method for calculating turbine flow rate based on multiple signals, characterized in that, Includes the following steps: S1. Based on the flow of the fluid being measured through the turbine flow meter, the turbine flow meter is used to acquire multiple signals of the fluid being measured, and the multiple signals of the fluid being measured are calculated to obtain the initial volumetric flow rate, temperature and pressure of the fluid being measured. S2. Based on the turbine flow meter, look up the physical property parameter table of the fluid being measured, and calculate the density and viscosity of the fluid being measured by combining the temperature and pressure of the fluid being measured. S3. Set up the calibration test bench and calibration flow rate, obtain the calibration viscosity, and calculate the correction coefficient based on the initial volumetric flow rate of the fluid being tested through nonlinear fitting. Then, construct the volumetric flow rate correction formula, as follows: S301. Set up the calibration test bench and calibration flow rate, and calibrate the turbine flow meter according to the calibration flow rate to obtain the viscosity of the fluid being measured during calibration. S302. Based on the calibration flow rate, the initial volumetric flow rate of the fluid being measured, and the viscosity of the fluid being measured during calibration, set an initial correction formula and calculate the correction coefficient through nonlinear fitting. S303. Construct the volumetric flow rate correction formula based on the correction coefficient; The volumetric flow rate correction formula is as follows: in, This represents the corrected volumetric flow rate. This indicates the viscosity of the fluid being measured. This indicates the initial volumetric flow rate of the fluid being measured. , , , , , as well as All represent correction factors; S4. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to obtain the corrected volumetric flow rate. Combine this with the density of the fluid to be measured to calculate the mass flow rate of the fluid to be measured, thus completing the turbine flow rate calculation.

2. The turbine flow calculation method based on multiple signals according to claim 1, characterized in that, S1 includes the following steps: S101. Based on the fluid being measured flowing through the turbine flow meter, the impeller speed signal is obtained using the turbine flow meter, and the impeller speed signal is calculated to obtain the initial volumetric flow rate of the fluid being measured. S102. Using the temperature sensor and pressure sensor in the turbine flow meter, acquire the temperature signal and pressure signal output by the turbine flow meter, and calculate the temperature signal and pressure signal to obtain the temperature and pressure of the fluid being measured.

3. The turbine flow calculation method based on multiple signals according to claim 1, characterized in that, S4 includes the following steps: S401. Substitute the viscosity and initial volumetric flow rate of the fluid to be measured into the volumetric flow rate correction formula to calculate the corrected volumetric flow rate; S402. Combining the density of the fluid being measured, multiply the corrected volumetric flow rate with the density of the fluid being measured to obtain the mass flow rate of the fluid being measured, thus completing the turbine flow rate calculation.

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