Self-adaptive processing equipment for excitation period of large-caliber electromagnetic water meter

Abstract

The utility model discloses excitation period self-adaptive processing equipment for a large-caliber electromagnetic water meter. The excitation period self-adaptive processing equipment comprises a main control module, an excitation module, an acquisition module, a first switching module, a second switching module and an ADC (Analog to Digital Converter) module, the main control module is respectively connected with the excitation module, the first switching module, the second switching module and the ADC module; the acquisition module is respectively connected with the excitation module and the first switching module; the first switching module is connected with the second switching module; the second switching module is connected with the ADC module; the main control module is used for controlling the excitation module to generate excitation signals and controlling the first switching module to enter a discharging mode or an amplifying and filtering mode; the acquisition module is used for acquiring voltage signals generated when fluid flows through a pipeline; the second switching module is used for switching the acquired voltage signals to enter different ADC channels; the ADC module is used for acquiring an AD value of a voltage signal generated when the fluid passes through the pipe section. The electromagnetic water meter solves the technical problem that an existing electromagnetic water meter is large in flow metering error.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic water meters, in particular to an excitation period adaptive processing device for a large-caliber electromagnetic water meter. Background Art

[0002] The working modes of electromagnetic water meters include measurement mode and calibration mode. The calibration mode generally adopts an excitation cycle of 1S, and the detected flow error is small, but this method is difficult to implement in actual working conditions and cannot be used in practice; the measurement mode takes power consumption into consideration during actual working conditions, and the industry basically adopts an excitation cycle of 10S-15S, but this method will cause sudden changes in flow and faster flow rate, and it cannot be monitored. The real-time performance of the flow is poor, which directly leads to a large deviation in the error value of the flow and cannot meet the standard. For example, a water meter with a nominal R400 has a large error value, and even only has a range ratio of R100, which is only at the level of a mechanical meter; the smaller the excitation cycle, the greater the power consumption, the faster the battery consumption, and the service life of a rotation cycle cannot be met; the larger the excitation cycle, the power consumption can meet the requirements, but the error value will be larger. For example, the patent document with application number 202210061804.7 discloses a low-power synchronous excitation drive technology for electromagnetic water meters, which also cannot solve the technical problem of large flow measurement errors in existing electromagnetic water meters. Therefore, it is urgent to propose an adaptive processing device for the excitation period of a large-caliber electromagnetic water meter to solve the technical problem of large flow measurement errors in existing electromagnetic water meters. Utility Model Content

[0003] The main purpose of the utility model is to provide a large-caliber electromagnetic water meter excitation cycle adaptive processing device, aiming to solve the technical problem of large flow measurement error of the existing electromagnetic water meter.

[0004] To achieve the above-mentioned purpose, the utility model provides a large-caliber electromagnetic water meter excitation cycle adaptive processing device, wherein the large-caliber electromagnetic water meter excitation cycle adaptive processing device comprises:

[0005] A main control module, an excitation module, an acquisition module, a first switching module, a second switching module, and an ADC module; the main control module is connected to the excitation module, the first switching module, the second switching module, and the ADC module respectively; the acquisition module is connected to the excitation module and the first switching module respectively; the first switching module is connected to the second switching module; the second switching module is connected to the ADC module;

[0006] The main control module is used to control the excitation module to generate an excitation signal, and to control the first switching module to enter a discharge mode or an amplification and filtering mode;

[0007] The acquisition module is used to collect voltage signals generated by fluid flowing through the pipeline;

[0008] The second switching module is used to switch the collected voltage signal to enter different ADC channels;

[0009] The ADC module is used to obtain the AD value of the voltage signal generated by the fluid passing through the pipe section.

[0010] In one of the preferred solutions, the ADC module includes a first ADC module and a second ADC module;

[0011] The first ADC module is connected to the second switching module and the main control module respectively, and the first ADC module is used to obtain a first AD value of a voltage signal generated by the fluid flowing through the pipe section;

[0012] The second ADC module is connected to the second switching module and the main control module respectively, and the second ADC module is used to obtain a second AD value of a voltage signal generated by the fluid flowing through the pipe section.

[0013] In one of the preferred solutions, the first ADC module adopts a 16-bit SAR ADC module.

[0014] In one of the preferred solutions, the second ADC module adopts a 24-bit Σ-Δ ADC module.

[0015] In one of the preferred solutions, the large-caliber electromagnetic water meter excitation cycle adaptive processing device further includes an amplification module;

[0016] The amplification module is connected to the first switching module, and is used to amplify the voltage signal collected by the collection module.

[0017] In one of the preferred solutions, the large-caliber electromagnetic water meter excitation cycle adaptive processing device further includes a filtering module;

[0018] The filtering module is connected to the amplifying module and the second switching module respectively, and the filtering module is used to filter the voltage signal amplified by the amplifying module to filter out high-frequency signals.

[0019] In one of the preferred solutions, the large-caliber electromagnetic water meter excitation cycle adaptive processing device further includes a discharge module;

[0020] The discharge module is connected to the first switching module, and is used to discharge residual energy after excitation to ensure that the paging reference remains unchanged.

[0021] In the above technical solution of the utility model, the large-caliber electromagnetic water meter excitation cycle adaptive processing equipment includes a main control module, an excitation module, an acquisition module, a first switching module, a second switching module, and an ADC module; the main control module is respectively connected to the excitation module, the first switching module, the second switching module, and the ADC module; the acquisition module is respectively connected to the excitation module and the first switching module; the first switching module is connected to the second switching module; the second switching module is connected to the ADC module; the main control module is used to control the excitation module to generate an excitation signal, and to control the first switching module to enter a discharge mode or an amplification and filtering mode; the acquisition module is used to collect the voltage signal generated by the fluid flowing through the pipeline; the second switching module is used to switch the collected voltage signal to enter different ADC channels; the ADC module is used to obtain the AD value of the voltage signal generated by the fluid passing through the pipe section. The utility model solves the technical problem of large flow measurement errors in existing electromagnetic water meters.

[0022] In the utility model, by setting a second switching module, the amplified and filtered voltage signals are respectively introduced into different ADC modules, and the first AD value is obtained through the first ADC module, so that the excitation cycle is adjusted according to the first AD value, and the real-time flow signal is obtained based on the adjusted excitation cycle, thereby improving the real-time and stability of flow acquisition, reducing the flow error, and improving the accuracy of the electromagnetic water meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of an excitation period adaptive processing device for a large-caliber electromagnetic water meter according to an embodiment of the utility model.

[0025] Description of Figure Numbers:

[0026] 1. Main control module; 2. Excitation module; 3. Acquisition module; 4. First switching module; 5. Discharge module; 6. Amplification module; 7. Filter module; 8. Second switching module; 9. ADC module; 91. First ADC module; 92. Second ADC module.

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0030] Furthermore, the technical solutions between the various implementation modes of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] See also Figure 1 According to one aspect of the utility model, the utility model provides a large-caliber electromagnetic water meter excitation cycle adaptive processing device, wherein the large-caliber electromagnetic water meter excitation cycle adaptive processing device comprises:

[0032] Main control module 1, excitation module 2, acquisition module 3, first switching module 4, ADC module 9; the main control module 1 is connected to the excitation module 2, the first switching module 4 and the ADC module 9 respectively; the acquisition module 3 is connected to the excitation module 2 and the first switching module 4 respectively; the first switching module 4 is connected to the ADC module 9;

[0033] The main control module 1 is used to control the excitation module 2 to generate an excitation signal, and to control the first switching module 4 to enter a discharge mode or an amplification and filtering mode;

[0034] The acquisition module 3 is used to collect the voltage signal generated by the fluid flowing through the pipeline;

[0035] The ADC module 9 is used to obtain the AD value of the voltage signal generated by the fluid passing through the pipe section.

[0036] Specifically, in this embodiment, the ADC module 9 includes a first ADC module 91 and a second ADC module 92; the first ADC module 91 is connected to the second switching module 8 and the main control module 1 respectively, and the first ADC module 91 is used to obtain a first AD value of a voltage signal generated by the fluid flowing through the pipe section; the second ADC module 92 is connected to the second switching module 8 and the main control module 1 respectively, and the second ADC module 92 is used to obtain a second AD value of a voltage signal generated by the fluid flowing through the pipe section.

[0037] Specifically, in this embodiment, the first ADC module 91 adopts a 16-bit SAR ADC module 9, which is responsible for the signal acquisition of the paging fast cycle excitation, has a fast response speed and a short setup time, can reduce the excitation time, and the excitation time can be maintained at 0.5 to 1 ms, with low power consumption. The data collected under low power consumption can be used to judge the fluid change; the change speed of the fluid is calculated by obtaining the first AD value, and the rapidity of the fluid is judged; the second ADC module 92 adopts a 24-bit Σ-Δ ADC module 9, which is used for signal acquisition of slow cycle excitation. For more accurate acquisition, the basic setup time is maintained at the ms level, the setup time is relatively long, the acquisition stability is high, the excitation time is generally maintained at 40 ms, the sampling resolution is high, and the second AD value finally obtained is used to calculate the flow rate; through the cooperation of the first ADC module 91 and the second ADC module 92, the first AD value and the second AD value of the voltage signal are respectively obtained, so as to adjust the excitation cycle in real time, improve the real-time performance of the flow rate, reduce the flow rate error, and improve the accuracy of the electromagnetic water meter.

[0038] Specifically, in this embodiment, the large-caliber electromagnetic water meter excitation period adaptive processing device further includes an amplification module 6 ; the amplification module 6 is connected to the first switching module 4 , and the amplification module 6 is used to amplify the voltage signal collected by the collection module 3 .

[0039] Specifically, in this embodiment, the large-caliber electromagnetic water meter excitation cycle adaptive processing device further includes a filter module 7; the filter module 7 is connected to the amplification module 6 and the second switching module 8 respectively, and the filter module 7 is used to filter the voltage signal amplified by the amplification module 6 to filter out the high-frequency signal

[0040] Specifically, in this embodiment, the large-caliber electromagnetic water meter excitation cycle adaptive processing device also includes a discharge module 5; the discharge module 5 is connected to the first switching module 4, and the discharge module 5 is used to discharge the residual energy after excitation to ensure that the benchmark for each paging remains unchanged.

[0041] Specifically, in this embodiment, the processing method of the large-caliber electromagnetic water meter excitation period adaptive processing device includes the following steps:

[0042] S1, the main control module 1 controls the excitation module 2 to periodically generate a paging excitation signal;

[0043] S2, the acquisition module 3 acquires the voltage signal generated by the fluid passing through the pipe section, amplifies and filters it, and obtains the first AD value through the ADC module 9;

[0044] S3, based on the first AD value, adaptively adjusting the excitation period of the long flow period;

[0045] S4, the main control module 1 performs excitation according to the excitation cycle determined by the paging excitation signal, obtains the voltage signal generated by the fluid passing through the pipe section for a second time, performs secondary amplification and filtering, obtains the second AD value through the ADC module 9, and accumulates the flow based on the second AD value.

[0046] Specifically, in this embodiment, before step S1, the following steps are further included:

[0047] S0, the main control module 1 enters the discharge mode through the first switching module 4 to discharge the voltage of the electrode; the main control module 1 enters the discharge mode by controlling the first switching module 4 to discharge the residual energy of the excitation through the discharge module 5, so that the original signal remaining in the acquisition module 3 is basically zero, that is, to avoid the residual energy from affecting the sampling value.

[0048] Specifically, in this embodiment, the main control module 1 controls the excitation module 2 to periodically generate a paging excitation signal, and the paging excitation signal is set to be once every 0.5s. The utility model does not make a specific limitation and can be set according to needs. The positive pulse width of the paging excitation signal is 0.5ms, and the negative pulse width is 0.5ms. In the utility model, the positive pulse and negative pulse of the paging excitation signal are set to 0.5ms, which can reduce the paging power consumption.

[0049] Specifically, in this embodiment, the acquisition module 3 acquires the voltage signal generated by the fluid flowing through the pipe section, that is, the induced electromotive force generated by the fluid flowing through the pipe section; the main control module 1 controls the first switching module 4 to enter the amplification and filtering mode, by transmitting the voltage signal acquired by the acquisition module 3 to the amplification module 6 for amplification, and the amplified signal is filtered by the filtering module 7 to filter out the high-frequency signal; the main control module 1 controls the filtered signal to enter the second switching module 8, and imports the filtered signal into the first ADC module 91 through the second switching control module, and the first ADC module 91 acquires the first AD value of the voltage signal, and transmits it to the main control module 1 for processing.

[0050] Specifically, in this embodiment, the step S3 adaptively adjusts the excitation period of the long period of flow based on the first AD value, specifically:

[0051] S31, obtain the first AD value in the adjacent paging cycle, and obtain the first paging cycle AD value X i1 , ..., X in and the second paging cycle AD value X j 1 , ..., X jn In the present utility model, the first ADC module 91 has a fast acquisition speed, and takes 10 data of a paging cycle for calculation, which can be set according to needs, and the present utility model does not specifically limit it;

[0052] S32, respectively remove the maximum AD value and the minimum AD value of the first paging cycle AD value and the second paging cycle AD value, and respectively calculate the average value X of the first paging cycle AD value and the second paging cycle AD value. iavg and X javg ;

[0053] S33, based on the average value X of the first paging cycle AD value and the second paging cycle AD value iavg and X javg , calculate the absolute value of the slope k; the absolute value of the slope k is:

[0054]

[0055] Among them, |k| is the absolute value of slope k, X iavg is the average value of AD value in the first paging cycle, X javg is the average value of AD value in the second paging cycle;

[0056] S34. Adaptively adjust the excitation period of the long flow period according to the absolute value of the slope k.

[0057] Specifically, in this embodiment, the step S34 adaptively adjusts the excitation period of the long flow period according to the absolute value of the slope k, and the k value depends on the different flow rates of different calibers, specifically:

[0058] Determine the range ratio and threshold of the electromagnetic water meter; the range ratio includes a first range ratio, a second range ratio and a third range ratio; the first range ratio is Q3 / Q1, the second range ratio is Q2 / Q1, and the third range ratio is Q3 / Q2, wherein Q3 is the common flow rate of the electromagnetic water meter, Q2 is the boundary flow rate of the electromagnetic water meter, and Q1 is the minimum flow rate of the electromagnetic water meter; for example, for an R400 electromagnetic water meter, Q3 / Q1 is 400, Q2 / Q1 is 1.6, and Q3 / Q2 is 250;

[0059] Performing |k| interval judgment according to the range ratio of the electromagnetic water meter;

[0060] If |k|≥the first range ratio Q3 / Q1, the excitation period is adjusted to the first excitation period; the first excitation period is 1S; if the third range ratio Q3 / Q2<|k|<the first range ratio Q3 / Q1, the excitation period is adjusted to the second excitation period; the second excitation period is 2S; if the second range ratio Q2 / Q1<|k|≤the third range ratio Q3 / Q2, the excitation period is adjusted to the third excitation period; the third excitation period is 4S; if |k|≤threshold, the excitation period is adjusted to an excitation period of 15s; the threshold is 1.6, which is not specifically limited in the present invention and can be set according to needs.

[0061] Specifically, in this embodiment, before step S4, the following steps are further included:

[0062] The main control module 1 enters the discharge mode through the first switching module 4, discharges the voltage of the electrode, that is, discharges the original signal remaining in the acquisition module 3, so that the signal remaining in the acquisition module 3 is basically zero, avoiding the residual energy from affecting the sampling value.

[0063] Specifically, in this embodiment, step S4 is specifically:

[0064] S41, the main control module 1 controls the periodic excitation according to the excitation cycle determined by the paging signal. Before the excitation cycle is determined, the default excitation cycle is 15s, and the pulse time width of the excitation is 160ms, of which the forward excitation cycle is 80ms and the reverse excitation cycle is 80ms;

[0065] S42, after the excitation module 2 sends out the excitation signal, the acquisition module 3 acquires the induced voltage generated by the water flowing through the pipe section, that is, the voltage signal;

[0066] S43, the main control module 1 controls the first switching module 4 to enter the amplification and filtering mode, and the amplification module 6 and the filtering module 7 amplify and filter the voltage signal in sequence;

[0067] S44, the main control module 1 controls the second switching module 8 to allow the voltage signal to enter the second ADC acquisition module 3, and the second ADC acquisition module 3 obtains the second AD value of the voltage signal generated by the fluid passing through the pipe section, and transmits the collected second AD value to the main control module 1 for flow accumulation calculation, thereby obtaining the total flow, and repeats steps S1-S4 until the flow calculation is no longer performed.

[0068] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A large-caliber electromagnetic water meter excitation cycle adaptive processing device, characterized in that: include: Main control module, excitation module, acquisition module, first switching module, second switching module, ADC module; The main control module is connected to the excitation module, the first switching module, the second switching module, and the ADC module respectively; the acquisition module is connected to the excitation module and the first switching module respectively; the first switching module is connected to the second switching module; the second switching module is connected to the ADC module; The main control module is used to control the excitation module to generate an excitation signal, and to control the first switching module to enter a discharge mode or an amplification and filtering mode; The acquisition module is used to collect voltage signals generated by fluid flowing through the pipeline; The second switching module is used to switch the collected voltage signal to enter different ADC channels; The ADC module is used to obtain the AD value of the voltage signal generated by the fluid passing through the pipe segment; The ADC module includes a first ADC module and a second ADC module; The first ADC module is connected to the second switching module and the main control module respectively, and the first ADC module is used to obtain a first AD value of a voltage signal generated by the fluid flowing through the pipe section, and the first ADC module adopts a 16-bit SAR ADC module; The second ADC module is connected to the second switching module and the main control module respectively. The second ADC module is used to obtain a second AD value of a voltage signal generated by the fluid flowing through the pipe section. The second ADC module adopts a 24-bit Σ-Δ type ADC module.

2. The large-caliber electromagnetic water meter excitation period adaptive processing device according to claim 1 is characterized in that: The large-caliber electromagnetic water meter excitation cycle adaptive processing device also includes an amplification module; The amplification module is connected to the first switching module, and is used to amplify the voltage signal collected by the collection module.

3. The large-caliber electromagnetic water meter excitation period adaptive processing device according to claim 2 is characterized in that: The large-caliber electromagnetic water meter excitation cycle adaptive processing device also includes a filtering module; The filtering module is connected to the amplifying module and the second switching module respectively, and the filtering module is used to filter the voltage signal amplified by the amplifying module to filter out high-frequency signals.

4. The large-caliber electromagnetic water meter excitation period adaptive processing device according to claim 1 is characterized in that: The large-caliber electromagnetic water meter excitation cycle adaptive processing device also includes a discharge module; The discharge module is connected to the first switching module, and is used to discharge residual energy after excitation to ensure that the paging reference remains unchanged.

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