CN115371746A - A flow metering device, method and storage medium - Google Patents

Abstract

The invention relates to the technical field of flow measurement and discloses a flow measurement device, a flow measurement method and a storage medium, wherein the device comprises a shell, a power generation mechanism, a data acquisition module and a data processing module, wherein the shell is connected with a flow inlet pipe, the power generation mechanism is arranged in the shell, and the power generation mechanism is used for detecting the flow of fluid of the flow inlet pipe and outputting alternating voltage; the data acquisition module is in communication connection with the data processing module, the data acquisition module is used for acquiring the alternating voltage according to a preset sampling period and sending the alternating voltage to the data processing module, and the data processing module is used for calculating according to the frequency of the alternating voltage to obtain the fluid flow. The method can realize the metering of the small flow and can improve the metering precision.

Description

A flow metering device, method and storage medium

technical field

The invention relates to the technical field of flow metering, in particular to a flow metering device, method and storage medium.

Background technique

At present, existing flow meters, such as water meters, are divided into rotor-type mechanical water meters, ultrasonic electronic water meters, electromagnetic electronic water meters, and pulse water meters based on rotor-type mechanical water meters according to different measurement principles.

Among the existing water meters, mechanical water meters can only meet the needs of measurement accuracy within the set water pressure range, and cannot measure very small flows (that is, dripping phenomena); ultrasonic electronic water meters require external power supply, measurement It is greatly affected by temperature, scale, foam, etc., and the measurement stability is insufficient; the electromagnetic electronic water meter also needs external power supply, and has high requirements for the stability of the resistivity of the fluid.

To sum up, the measurement accuracy of various existing flowmeters is not high, and they cannot measure small flow rates.

Contents of the invention

The invention provides a flow metering device, a method and a storage medium, so as to realize the metering of a small flow rate and improve the metering accuracy at the same time.

In the first aspect, in order to solve the above technical problems, the present invention provides a flow metering device, including a housing, a power generating mechanism, a data acquisition module and a data processing module, the housing is connected with an inlet pipe, and the power generating mechanism is set In the housing, the power generating mechanism is used to detect the fluid flow of the inlet pipe and output an AC voltage; the data acquisition module is in communication connection with the data processing module, and the data acquisition module is used to The sampling period is to obtain the AC voltage and send it to the data processing module; the data processing module is configured to:

receiving the AC voltage, and calculating a voltage frequency of the AC voltage;

performing fast Fourier transform on the voltage frequency to obtain the fundamental frequency;

obtaining a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database;

Calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period;

All the instantaneous flow rates are accumulated to obtain the fluid flow rate.

Preferably, the power generating mechanism includes a stator and a rotor, the rotor is used to rotate with the fluid, the rotation axis of the rotor is perpendicular to the flow direction of the fluid, the data input end of the data acquisition module is connected to the output end of the stator connect.

Preferably, the power generating mechanism further includes a rectification module and an energy storage module, the input end of the rectification module is connected to the output end of the stator, the output end of the rectification module is connected to the input end of the energy storage module, The output end of the energy storage module is connected to the power input end of the data acquisition module.

Preferably, the discharge coefficient database includes a fundamental frequency-discharge coefficient relationship curve.

Preferably, the configuration process of the fundamental frequency-discharge coefficient relationship curve includes:

Obtain m measurement voltage frequencies according to the preset m flow levels, and m is a positive integer greater than 1;

Fast Fourier transform is performed on the m measured voltage frequencies respectively to obtain m measured fundamental frequencies;

performing calculations based on the m measured fundamental frequencies, the non-zero numbers of the m measured fundamental frequencies, and the preset total flow, to obtain m measured flow coefficients corresponding to the measured fundamental frequencies;

Fitting is performed based on the m measured fundamental frequencies and the m measured discharge coefficients to obtain a fundamental frequency-discharge coefficient relationship curve.

Preferably, the flow gear is positively related to the cross-sectional area used for fluid communication in the inlet pipe, and the flow gear at least includes a maximum flow gear and a minimum flow gear.

Preferably, the calculation formula of the measured flow coefficient is:

K=L/f*n

Wherein, K is the measured discharge coefficient, L is the total flow, f is the measured fundamental frequency, and n is the non-zero number of the m measured fundamental frequencies.

Preferably, the device further includes a display module, which is communicatively connected with the data processing module, and the display module is used to display the fluid flow and the working status of the flow metering device.

In a second aspect, the present invention provides a flow metering method, which is implemented based on the flow metering device described in any one of the first aspect, and the method includes:

Acquiring the AC voltage output by the power generating mechanism, and calculating the voltage frequency of the AC voltage;

performing fast Fourier transform on the voltage frequency to obtain the fundamental frequency;

obtaining a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database;

Calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period;

All the instantaneous flow rates are accumulated to obtain the fluid flow rate.

In the third aspect, the present invention also provides a computer-readable storage medium, the computer-readable storage medium includes a stored computer program, wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute The flow measurement method described in any one of the above-mentioned second aspects.

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

The flow metering device provided by the present invention includes a housing, a power generating mechanism, a data acquisition module and a data processing module, the housing is connected with an inlet pipe, the power generating mechanism is arranged in the housing, and the power generating mechanism is used for Detecting the fluid flow of the inlet pipe and outputting an AC voltage; the data acquisition module communicates with the data processing module, and the data acquisition module is used to acquire the AC voltage according to a preset sampling period and send it to the the data processing module.

When the fluid in the inlet pipe flows, the power generating mechanism can output an AC voltage. At this time, the data acquisition module acquires the AC voltage and sends it to the data processing module. The data processing module is configured to: receive the AC voltage, And calculate the voltage frequency of the AC voltage; perform fast Fourier transform on the voltage frequency to obtain the fundamental frequency; according to the fundamental frequency and the preset flow coefficient database, obtain the corresponding to the fundamental frequency flow coefficient; calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow in each sampling period; accumulate all the instantaneous flow to obtain the fluid flow. Calculate the flow of the fluid through the voltage frequency, as long as the fluid flows, an AC voltage can be generated, thereby realizing the measurement of small flow. At the same time, the flow rate is only related to the frequency of the AC voltage, which is variable and measurable in real time, that is, the measurement accuracy can be dynamically adjusted by measuring the frequency of the AC voltage as the flow rate varies.

Description of drawings

Fig. 1 is a schematic structural diagram of a flow metering device provided by a preferred embodiment of the present invention;

Fig. 2 is a schematic diagram of the data processing flow provided by a preferred embodiment of the present invention;

Fig. 3 is a graph showing the fundamental wave frequency-discharge coefficient relation curve provided by the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1, an embodiment of the present invention provides a flow metering device, including a housing, a power generating mechanism, a data acquisition module and a data processing module, the housing is connected with an inlet pipe, the power generating mechanism is arranged in the housing, and the power generating mechanism is used for The fluid flow in the inlet pipe is detected and an AC voltage is output; the data acquisition module communicates with the data processing module, and the data acquisition module is used to obtain the AC voltage according to a preset sampling period and send it to the data processing module.

Specifically, the generating mechanism includes a stator and a rotor. The rotor is used to rotate following the fluid. The rotation axis of the rotor is perpendicular to the flow direction of the fluid. The data input end of the data acquisition module is connected to the output end of the stator. Wherein, the rotor includes several permanent magnets, and the several permanent magnets form a Halbach array, which is beneficial to reduce the air gap and increase the sensitivity. Taking a water meter as an example, the rotation axis of the rotor is perpendicular to the flow direction of the fluid, that is, the rotation axis is perpendicular to the horizontal plane, which is conducive to the rotation of the rotor following the water flow and reducing the friction of the rotor.

Further, the power generation mechanism also includes a rectification module and an energy storage module, the input end of the rectification module is connected to the output end of the stator, the output end of the rectification module is connected to the input end of the energy storage module, and the output end of the energy storage module is connected to the data acquisition module connected to the power input terminal. Preferably, a voltage stabilizing chip is connected to the output end of the energy storage module. In a specific application, the energy storage module can use a supercapacitor, and the supercapacitor then outputs a stable voltage through a voltage regulator chip as a working power source, without external power supply, which further increases the practicability of the device.

In one embodiment, the data acquisition module is arranged on the casing, and the data acquisition module and the data processing module are integrated into one body. At this time, the energy storage module supplies power to the data acquisition module and the data processing module. In another embodiment, the data acquisition module is arranged on the casing, and the data processing module is arranged on the data processing terminal, and at this time, the energy storage module supplies power to the data acquisition module. It should be noted that as long as the data acquisition module and the data processing module are connected in communication, the present invention does not specifically limit the installation position and manner of the two.

Exemplarily, the fluid generator adopts a permanent magnet inner rotor, and the stator part adopts an ironless conductive coil, which evenly forms a 6-phase voltage output with 12 poles and 6 pairs of coils. When the water flows in the copper tube, it drives the permanent magnet inner rotor Rotate, 6 pairs of coils output voltage at the same time, each pair of coil output voltage phase difference is 60 degrees, bridge rectification is used to rectify the output voltage of 6 groups, the rectified output is output to the 5V super capacitor through the regulator tube, and the super capacitor passes through the LDO The voltage regulator chip outputs a stable voltage as the working power supply, so no external power supply is needed.

Further, 2 pairs of coils are respectively selected from the 6 pairs of coils, and differential sampling is adopted, with a sampling frequency of 10Khz and a sampling period of 1/10Khz, to measure the output voltage of the coils. Depending on the water pressure and water flow, the output of this coil is an approximate sine wave voltage with a frequency range of 0-600hz and a Vpp of 10V. The higher the frequency, the greater the water pressure difference and the greater the flow rate per unit time flowing through the section of the inlet pipe. Regardless of the diameter of the inlet pipe, the flow rate is only related to the frequency of the AC voltage and the flow time. When there is a valve device on the inlet pipe, such as a faucet, the frequency of the AC voltage changes accordingly when the size of the faucet switch is adjusted, and the frequency of the coil output voltage changes accordingly when the water pressure at the water inlet is adjusted. In a specific application, the data acquisition module acquires the AC voltage according to the sampling period and sends it to the data processing module.

Referring to Figure 2, the data processing module is used to perform the following steps:

S11. Receive the AC voltage, and calculate the voltage frequency of the AC voltage;

S12, performing a fast Fourier transform on the voltage frequency to obtain a fundamental frequency;

S13. Obtain a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database;

S14, calculating the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period;

S15. Accumulate all the instantaneous flow rates to obtain fluid flow rates.

In step S11, the data processing module and the data acquisition module can use wired communication, or transmit AC voltage data through wireless communication such as Bluetooth, ZigBee, WiFi, etc. After receiving the AC voltage, the data processing module calculates the voltage frequency of the AC voltage.

In step S12, fast Fourier transform is performed on the voltage frequency to obtain the fundamental frequency. Specifically, the relevant algorithm of fast Fourier transform is pre-configured in the data processing module, and the discrete Fourier transform is performed on the voltage frequency to obtain the fundamental frequency.

In step S13, the discharge coefficient corresponding to the fundamental frequency is obtained according to the fundamental frequency and a preset discharge coefficient database. Wherein, the discharge coefficient database includes a fundamental frequency-discharge coefficient relationship curve, as shown in FIG. 3 . Certainly, in other embodiments, the discharge coefficient database may also be in the form of graphs, equations and the like. Exemplarily, the fitted curve equation includes multiple straight lines, and the flow coefficient can be calculated by linear interpolation and straight line equations. Taking i as a positive integer, when the fundamental frequency f _x falls between f _i and f _i+1 , the corresponding flow coefficient K _x =K _i +(K _i+1 -K _i )*(f _x -f _i )/(f _i+1 -f _i ).

In one embodiment, the configuration process of the fundamental frequency-discharge coefficient relationship curve includes:

Obtain m measurement voltage frequencies according to the preset m flow levels, and m is a positive integer greater than 1;

Fast Fourier transform is performed on the m measured voltage frequencies respectively to obtain m measured fundamental frequencies;

performing calculations based on the m measured fundamental frequencies, the non-zero numbers of the m measured fundamental frequencies, and the preset total flow, to obtain m measured flow coefficients corresponding to the measured fundamental frequencies;

Fitting is performed based on the m measured fundamental frequencies and the m measured discharge coefficients to obtain a fundamental frequency-discharge coefficient relationship curve.

Further, in order to increase the reliability of the data, the sampling groups are divided according to the preset frequency, and the measured voltage frequencies of multiple sampling groups are obtained, and the sampling points of adjacent sampling groups partially overlap.

Exemplarily, in the configuration process of the fundamental wave frequency-discharge coefficient relationship curve, the sampling frequency is set to 8Khz, and every 64 sampling points is a group, and the fast Fourier transform (FFT) transformation is performed to obtain the measured fundamental wave frequency . At the same time, adjacent sampling groups overlap 32 sampling points, and continuously perform FFT transformation on the 64 consecutive overlapping sampling points to obtain the measured fundamental frequency every 4ms in turn. Through the multiple measurement fundamental frequencies measured and calculated by the device respectively at intervals of 4ms, record the multiple measurement fundamental frequencies and the number of non-zero measurement fundamental frequencies. The measurement fundamental frequency is basically fixed when the flow rate is stable, and when the water inlet pipe is cut off, the measurement fundamental frequency is 0 immediately.

Then, calculate according to the m measured fundamental frequencies, the non-zero numbers of the m measured fundamental frequencies, and the preset total flow, to obtain m measured flow coefficients corresponding to the measured fundamental frequencies .

The calculation formula of the measured flow coefficient is:

K=L/f*n

Wherein, K is the measured discharge coefficient, L is the total flow, f is the measured fundamental frequency, and n is the non-zero number of the m measured fundamental frequencies.

In this embodiment, L liters of water is obtained by an instrument with an accuracy of 0.1 or higher, and this L liter of water is taken as the total flow.

It should be noted that the flow gear is positively related to the cross-sectional area used for fluid communication in the inlet pipe, and the flow gear includes at least a maximum flow gear and a minimum flow gear. The inlet pipe can be equipped with a valve device, and by controlling the on-off size of the valve device, the increase or decrease of the cross-sectional area for fluid circulation in the inlet pipe can be controlled. For example, the water flow is controlled by a valve device, such as a faucet. The maximum flow gear is the flow gear when the faucet is turned on to the maximum, and the minimum flow gear is the flow gear when the faucet is turned off to the minimum.

In the specific application, taking the water meter as an example, assuming that the maximum flow of the water meter is Q3 and the minimum flow is Q1, set Q1 to Q3 to 10 levels respectively, measure 10 groups of different measurement fundamental frequencies and measurement flow coefficients, and simulate Combined, the fundamental frequency-discharge coefficient relationship curve is obtained.

In steps S14 and S15, the product of the sampling period and the flow coefficient is calculated to obtain the instantaneous flow rate in each sampling period; all the instantaneous flow rates are accumulated to obtain the fluid flow rate.

It should be noted that the flow rate is related to time, and the flow rate is the amount of water flowing out during the period from the opening of the valve to the closing time T0-T1. From a mathematical point of view, it is the integral of the unit flow rate in the T0-T1 time period. If the unit velocity is constant, the flow rate is the unit velocity multiplied by (T1-T0). In this embodiment, the flow coefficient is the unit flow rate in each sampling period, so the product of the sampling period and the flow coefficient is calculated to obtain the instantaneous flow rate in each sampling period. Finally, all the instantaneous flow rates are accumulated to obtain the fluid flow rate.

In a preferred embodiment, the device further includes a display module, which is communicatively connected with the data processing module, and the display module is used to display the fluid flow and the working status of the flow metering device. Exemplarily, the display module may display content such as an indication of starting water supply, an indication of stopping water supply, and the current (since water supply starts this time) total amount of water sent per second.

The flow metering device provided by the invention calculates the flow rate of the fluid through the voltage frequency, and can generate AC voltage as long as the fluid flows, thereby realizing the metering of small flow rates. At the same time, the flow rate is only related to the frequency of the AC voltage, which is variable and measurable in real time, that is, the measurement accuracy can be dynamically adjusted by measuring the frequency of the AC voltage as the flow rate varies. In addition, the device does not require external power supply, can automatically adjust the measurement accuracy within a large range, is not subject to external electromagnetic interference, is simple to adjust, consumes less materials for manufacturing, and is small in size.

The embodiment of the present invention also provides a flow metering method, which is implemented based on the flow metering device described in the above embodiment, including:

Acquiring the AC voltage output by the power generating mechanism, and calculating the voltage frequency of the AC voltage;

performing fast Fourier transform on the voltage frequency to obtain the fundamental frequency;

obtaining a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database;

Calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period;

All the instantaneous flow rates are accumulated to obtain the fluid flow rate.

It should be noted that the flow metering method provided in the embodiment of the present invention corresponds to all the implementation steps of the flow metering device in the above embodiment, and the working principles and beneficial effects of the two correspond one by one, so they are not repeated here.

The embodiment of the present invention also provides a terminal device. The terminal device includes: a processor, a memory, and a computer program stored in the memory and operable on the processor, such as a flow metering program. When the processor executes the computer program, the steps in the above embodiments of the flow metering method are realized. Alternatively, when the processor executes the computer program, functions of each module/unit in the above-mentioned device embodiments, such as a data processing module, are implemented.

Exemplarily, the computer program may be divided into one or more modules/units, and the one or more modules/units are stored in the memory and executed by the processor to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of accomplishing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

The terminal device may be computing devices such as desktop computers, notebooks, palmtop computers, and smart tablets. The terminal device may include, but not limited to, a processor and a memory. Those skilled in the art can understand that the above-mentioned components are only examples of terminal equipment, and do not constitute a limitation on terminal equipment, and may include more or less components than the above-mentioned components, or combine some components, or different components, such as the The above-mentioned terminal equipment may also include input and output equipment, network access equipment, bus and so on.

The so-called processor can be a central processing unit (Central Processing Unit, CPU), and can also be other general-purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf Programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and connects various parts of the entire terminal device with various interfaces and lines.

The memory can be used to store the computer programs and/or modules, and the processor implements the terminal by running or executing the computer programs and/or modules stored in the memory and calling the data stored in the memory various functions of the device. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.) and the like; the storage data area may store Data created based on the use of the mobile phone (such as audio data, phonebook, etc.), etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, internal memory, plug-in hard disk, smart memory card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card , a flash memory card (Flash Card), at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

Wherein, if the modules/units integrated in the terminal equipment are realized in the form of software function units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the present invention realizes all or part of the processes in the methods of the above embodiments, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer When the program is executed by the processor, the steps in the above-mentioned various method embodiments can be realized. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, and a read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, computer-readable media Excludes electrical carrier signals and telecommunication signals.

It should be noted that the device embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physically separated. A unit can be located in one place, or it can be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. It can be understood and implemented by those skilled in the art without creative effort.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the protection scope of the present invention. . In particular, for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A flow metering device, characterized in that it comprises a housing, a power generating mechanism, a data acquisition module and a data processing module, the housing is connected with an inlet pipe, the power generating mechanism is arranged in the housing, the The power generation mechanism is used to detect the fluid flow of the inlet pipe and output an AC voltage; the data acquisition module is in communication connection with the data processing module, and the data acquisition module is used to acquire the AC voltage according to a preset sampling period and sent to the data processing module; The data processing module is configured to: receiving the AC voltage, and calculating a voltage frequency of the AC voltage; performing fast Fourier transform on the voltage frequency to obtain the fundamental frequency; obtaining a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database; Calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period; All the instantaneous flow rates are accumulated to obtain the fluid flow rate. 2. The flow metering device according to claim 1, wherein the power generating mechanism comprises a stator and a rotor, the rotor is used to follow the rotation of the fluid, the rotation axis of the rotor is perpendicular to the flow direction of the fluid, and the The data input end of the data acquisition module is connected with the output end of the stator. 3. The flow metering device according to claim 2, wherein the power generating mechanism further comprises a rectification module and an energy storage module, the input end of the rectification module is connected to the output end of the stator, and the rectification module The output end of the energy storage module is connected to the input end of the energy storage module, and the output end of the energy storage module is connected to the power input end of the data acquisition module. 4. The flow metering device according to claim 1, wherein the flow coefficient database includes a fundamental frequency-flow coefficient relationship curve. 5. The flow metering device according to claim 4, wherein the configuration process of the fundamental frequency-flow coefficient relationship curve comprises: Obtain m measurement voltage frequencies according to the preset m flow levels, and m is a positive integer greater than 1; Fast Fourier transform is performed on the m measured voltage frequencies respectively to obtain m measured fundamental frequencies; performing calculations based on the m measured fundamental frequencies, the non-zero numbers of the m measured fundamental frequencies, and the preset total flow, to obtain m measured flow coefficients corresponding to the measured fundamental frequencies; Fitting is performed based on the m measured fundamental frequencies and the m measured discharge coefficients to obtain a fundamental frequency-discharge coefficient relationship curve. 6. The flow metering device according to claim 5, wherein the flow gear is positively related to the cross-sectional area used for fluid circulation in the inlet pipe, and the flow gear includes at least the maximum flow gear and minimum flow gear. 7. The flow metering device according to claim 5, characterized in that, the calculation formula of the measured flow coefficient is: K=L/f*n Wherein, K is the measured discharge coefficient, L is the total flow, f is the measured fundamental frequency, and n is the non-zero number of the m measured fundamental frequencies. 8. The flow metering device according to claim 1, characterized in that, the device further comprises a display module, the display module is communicatively connected with the data processing module, and the display module is used to display fluid flow and flow metering The working status of the device. 9. A flow metering method, realized based on the flow metering device according to any one of claims 1 to 8, characterized in that the method comprises: Acquiring the AC voltage output by the power generating mechanism, and calculating the voltage frequency of the AC voltage; performing fast Fourier transform on the voltage frequency to obtain the fundamental frequency; obtaining a discharge coefficient corresponding to the fundamental frequency according to the fundamental frequency and a preset discharge coefficient database; Calculate the product of the sampling period and the flow coefficient to obtain the instantaneous flow rate in each sampling period; All the instantaneous flow rates are accumulated to obtain the fluid flow rate. 10. A computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute 9 flow metering method.

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