A liquid volume flow metering method based on a frequency signal

Abstract

The present application relates to a kind of flowmeter volume flow measurement method, to solve the technical problems that flowmeter needs to use current acquisition equipment, frequency acquisition equipment and other auxiliary equipment when measuring liquid volume flow in prior art, resulting in the technical problems that flowmeter structure is too complex, cost is higher.A kind of liquid volume flow measurement method based on frequency signal provided by the present application, comprising: obtaining the acquisition time and cumulative pulse number of multiple groups of flowmeter;Establish time difference data model and pulse number difference value model;Any two adjacent acquisition time and the cumulative pulse number corresponding to two acquisition time are substituted into time difference data model and pulse number difference value model respectively, to obtain time difference and pulse number difference value;Establish frequency model;Time difference and pulse number difference value are substituted into frequency model to obtain the frequency of output signal;Establish flow value acquisition model, and the frequency of output signal is substituted into flow value acquisition model to obtain flow value, complete liquid volume flow measurement.

Description

Technical Field

[0001] This invention relates to a flow meter volumetric flow rate measurement method, specifically a liquid volumetric flow rate measurement method based on frequency signals. Background Technology

[0002] Liquid volumetric flow rate measurement is an important measurement frequently required in industrial production, scientific research, and daily life. In many industrial processes, the magnitude of liquid volumetric flow rate directly affects product quality and production efficiency. Therefore, measuring liquid volumetric flow rate is of great significance for industrial production process control and optimization.

[0003] Liquid volumetric flow meters are commonly used instruments for measuring fluid flow. In the process of measuring liquid volumetric flow, the current signal and frequency signal of the liquid volumetric flow meter are usually collected by a current acquisition device or a frequency acquisition device, and the current signal or frequency signal is converted into flow rate and displayed by a data processing module. However, the drawback of this method is that the flow meter needs to use auxiliary equipment such as current acquisition devices and frequency acquisition devices, which makes the flow meter structure too complex and the cost of testing flow rate is high. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem that in the existing technology, when measuring the volumetric flow rate of liquids, the flow meter needs to use auxiliary equipment such as current acquisition devices and frequency acquisition devices, which leads to the flow meter structure being too complex and the cost being high. The invention provides a liquid volumetric flow rate measurement method based on frequency signals.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] A liquid volumetric flow rate measurement method based on frequency signals, characterized by the following steps:

[0007] S1. Obtain the acquisition time of multiple flow meters and the cumulative number of pulses corresponding to the acquisition time;

[0008] S2. Establish a time difference data model corresponding to any two adjacent acquisition times, and a pulse number difference model corresponding to the cumulative pulse number corresponding to the any two adjacent acquisition times;

[0009] S3. Take any two adjacent acquisition times and the cumulative pulse count corresponding to the two acquisition times from the multiple sets of flowmeter acquisition times obtained in step S1, and substitute them into the time difference data model and pulse count difference model established in step S2 respectively to obtain the time difference and pulse count difference.

[0010] S4. Establish a frequency model corresponding to the time difference and pulse number difference with the adjacent previous acquisition time at any acquisition time;

[0011] S5. Substitute the time difference and pulse number difference obtained in step S3 into the frequency model established in step S4 to obtain the frequency of the output signal of the flowmeter between any two adjacent acquisition times.

[0012] S6. Establish a flow value acquisition model related to the flow rate value and the frequency of the output signal. Substitute the frequency of the output signal obtained in step S5 into the flow value acquisition model to obtain the flow rate value between any two adjacent acquisition times, thus completing the liquid volume flow rate measurement.

[0013] Furthermore, in step S6, the flow rate value acquisition model is as follows: In the formula, q is the flow rate, f is the frequency of the output signal, and K is the inherent instrument coefficient of the flow meter.

[0014] Furthermore, in step S2, the time difference data model is: Δt = t i -t i-1 ;

[0015] In the formula, Δt is the time difference between two adjacent acquisition times; t i and t i-1 These are the acquisition times for the i-th group and the (i-1)-th group, respectively, where i is a positive integer greater than 1.

[0016] Furthermore, in step S2, the pulse number difference model is: ΔN = N i -N i-1 ;

[0017] In the formula, ΔN is the pulse number difference between two adjacent cumulative pulse counts; N i and N i-1 t i t i-1 The cumulative number of pulses corresponding to the acquisition time.

[0018] Furthermore, in step S4, the frequency model is:

[0019] In the formula, f is the frequency of the output signal, ΔN is the pulse number difference between two adjacent cumulative pulse counts, and Δt is the time difference between two adjacent acquisition times.

[0020] Furthermore, step S1 specifically includes:

[0021] The acquisition time of multiple flow meters and the cumulative number of pulses corresponding to the acquisition time are obtained by using a pulse counter.

[0022] Furthermore, in step S1, the flow meter is a liquid volumetric flow meter;

[0023] The inherent instrument coefficient K of the flow meter is 5L. -1 .

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. The liquid volume flow rate measurement method based on frequency signal provided by the present invention establishes a time difference data model and a pulse number difference model. By substituting any two adjacent acquisition times and the cumulative pulse number into the model, the time difference and pulse number difference are obtained. Then, a frequency model is established corresponding to the time difference and pulse number difference of the adjacent previous acquisition time at any acquisition time. The time difference and pulse number difference are substituting into the frequency model to obtain the frequency of the output signal. Finally, a flow rate acquisition model related to the flow rate value and the frequency of the output signal is established. The flow rate value between any two adjacent acquisition times is obtained by substituting the frequency of the output signal into the flow rate acquisition model, thus completing the liquid volume flow rate measurement.

[0026] 2. This invention achieves liquid volume flow rate measurement at a low cost by acquiring only the acquisition time, cumulative pulse count, and inherent instrument coefficient, without the need for current acquisition equipment or frequency acquisition equipment. This overcomes the technical problem of existing technologies where flow meters require current acquisition equipment, frequency acquisition equipment, and other equipment for assistance when measuring liquid volume flow rate, resulting in high cost and complex structure. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] A liquid volumetric flow rate measurement method based on frequency signals includes the following steps:

[0029] S1. Obtain the acquisition time of 10 sets of liquid volumetric flow meters and the cumulative number of pulses corresponding to the acquisition time through a pulse counter.

[0030] S2. Establish a time difference data model corresponding to any two adjacent acquisition times, and a pulse number difference model corresponding to the cumulative pulse number corresponding to any two adjacent acquisition times;

[0031] The time difference data model is: Δt = t i -t i-1 In the formula, Δt is the time difference between two adjacent acquisition times; t i and t i-1These are the collection times for the i-th group and the (i-1)-th group, respectively, where 1 ≤ i ≤ 10 and i is a positive integer;

[0032] The pulse number difference model is: ΔN = N i -N i-1 In the formula, ΔN is the pulse number difference between two adjacent cumulative pulse counts; N i and N i-1 t i t i-1 The cumulative number of pulses corresponding to the acquisition time.

[0033] S3. Take any two adjacent acquisition times and the cumulative pulse count corresponding to the two acquisition times from the multiple sets of flowmeter acquisition times obtained in step S1, and substitute them into the time difference data model and pulse count difference model established in step S2 respectively to obtain the time difference and pulse count difference.

[0034] S4. Establish a frequency model corresponding to the time difference and pulse number difference with the adjacent previous acquisition time at any acquisition time;

[0035] The frequency model is: In the formula, f is the frequency of the output signal, ΔN is the pulse number difference between two adjacent cumulative pulse counts, and Δt is the time difference between two adjacent acquisition times.

[0036] S5. Substitute the time difference and pulse number difference obtained in step S3 into the frequency model established in step S4 to obtain the frequency of the output signal of the flowmeter between any two adjacent acquisition times.

[0037] S6. Establish a flow rate acquisition model that is related to the flow rate value and the frequency of the output signal. The flow rate acquisition model is as follows: In the formula, q is the flow rate, f is the frequency of the output signal, and K is the inherent instrument coefficient of the flow meter, which is 5L. -1 ;

[0038] Substitute the frequency of the output signal obtained in step S5 into the flow rate acquisition model to obtain the flow rate value between any two adjacent acquisition times, thus completing the liquid volume flow rate measurement.

[0039] Based on the above steps, the acquisition time of the 10 sets of liquid volumetric flow meters in this embodiment, as well as the cumulative number of pulses corresponding to the acquisition time, are processed, and the obtained flow values ​​are shown in the table below.

[0040] Table 1: Data Table of Liquid Volume Flow Rate Measurement Process

[0041] 0 16:38:52.172 2 1 16:38:52.372 134 0.2 132 660 130.200 2 16:38:52.574 265 0.202 131 649 131.502 3 16:38:52.775 399 0.201 134 667 130.851 4 16:38:52.977 530 0.202 131 649 131.502 5 16:38:53.178 661 0.201 131 652 130.851 6 16:38:53.378 792 0.2 131 655 130.200 7 16:38:53.579 924 0.201 132 657 130.851 8 16:38:53.779 1055 0.2 131 655 130.200 9 16:38:53.979 1185 0.2 130 650 130.200 10 16:38:54.179 1316 0.2 131 655 130.200

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A liquid volumetric flow rate measurement method based on frequency signals, characterized in that, Includes the following steps: S1. Obtain the acquisition time of multiple flow meters and the cumulative number of pulses corresponding to the acquisition time; S2. Establish a time difference data model corresponding to any two adjacent acquisition times, and a pulse number difference model corresponding to the cumulative pulse number corresponding to the any two adjacent acquisition times; S3. Take any two adjacent acquisition times and the cumulative pulse count corresponding to the two acquisition times from the multiple sets of flowmeter acquisition times obtained in step S1, and substitute them into the time difference data model and pulse count difference model established in step S2 respectively to obtain the time difference and pulse count difference. S4. Establish a frequency model corresponding to the time difference and pulse number difference with the adjacent previous acquisition time at any acquisition time; The frequency model is: = ; In the formula, The frequency of the output signal, It is the pulse count difference between two adjacent cumulative pulse counts. The time difference between two adjacent data collection times; S5. Substitute the time difference and pulse number difference obtained in step S3 into the frequency model established in step S4 to obtain the frequency of the output signal of the flowmeter between any two adjacent acquisition times. S6. Establish a flow value acquisition model related to the flow value and the frequency of the output signal. Substitute the frequency of the output signal obtained in step S5 into the flow value acquisition model to obtain the flow value between any two adjacent acquisition times, and complete the liquid volume flow rate measurement. The traffic value acquisition model is as follows: = In the formula, For flow rate value, The frequency of the output signal; This is the inherent instrument coefficient of the flow meter.

2. The liquid volume flow rate measurement method based on frequency signal according to claim 1, characterized in that: In step S2, the time difference data model is as follows: - ; In the formula, The time difference between two adjacent data collection times; and The first Group, No. Group collection time, It is a positive integer greater than 1.

3. The liquid volume flow rate measurement method based on frequency signal according to claim 2, characterized in that: In step S2, the pulse number difference model is as follows: - ; In the formula, This represents the pulse count difference between two adjacent cumulative pulse counts. and They are respectively , The cumulative number of pulses corresponding to the acquisition time.

4. The liquid volume flow rate measurement method based on frequency signals according to claim 3, characterized in that, Step S1 is as follows: The acquisition time of multiple flow meters and the cumulative number of pulses corresponding to the acquisition time are obtained by using a pulse counter.

5. The liquid volume flow rate measurement method based on frequency signal according to claim 4, characterized in that: In step S1, the flow meter is a liquid volumetric flow meter; The inherent instrument coefficient of the flow meter 5 .

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