Flowmeter capable of realizing online calibration function

Abstract

The utility model relates to a flowmeter capable of realizing an on-line calibration function, which comprises a regulating valve, a pipe section and an integrating controller, the regulating valve and the pipe section are mutually connected in series, and the integrating controller is respectively connected with the regulating valve and the pipe section; an impeller is arranged in the pipe section, the upper end of the impeller is connected with a permanent magnet synchronizer, an electromagnetic damper and a magnetic pulse detector which are correspondingly matched with the permanent magnet synchronizer are arranged on the outer side of the pipe section, and the electromagnetic damper, the permanent magnet synchronizer and the magnetic pulse detector jointly form an online calibration unit; a control communication unit is arranged in the integrating controller and connected with the adjusting valve, the electromagnetic damper and the magnetic pulse detector through control wires. The control communication unit comprises a data storage unit. The impeller plays a role in measuring the water flow, the electromagnetic damper plays a role in calibration, and the electromagnetic damper plays a role only when calibration is implemented. Water flow sequentially flows through the pipe section and the adjusting valve from left to right.

Description

TECHNICAL FIELD

[0001] The utility model relates to the flowmeter field, specifically, relate to a kind of flowmeter that can realize online calibration function, it can realize automatic or manual flow online calibration function by built-in electromagnetic damper and regulating valve, it is applicable to heating, heat metering, air conditioning, water affairs, billing etc. BACKGROUND

[0002] As we all know, flowmeter calibration refers to the calibration of flowmeter to ensure its measurement accuracy and accuracy. As an important instrument for measuring fluid flow, flowmeter plays an irreplaceable role in industrial production, environmental monitoring, energy metering and other fields. However, due to factors such as scale, medium impurities, external impact, component aging damage, rust and other factors, the measurement accuracy of flowmeter may gradually decrease, and even lead to data distortion. Therefore, it is particularly important to calibrate flowmeter regularly.

[0003] For example, existing flowmeter and other measuring instruments, once installed in the use site or used for a period of time, the detection error will gradually increase with time. Especially in the use scene of heating, heating users, the flowmeter is limited by installation location, heating medium cleanliness, external impact and other factors, and the measurement error will gradually become serious, which will easily lead to flow parameter misjudgment, and then will seriously affect the heat allocation and control work, so that the related measurement statistics and measurement charging lose reliable basis.

[0004] Due to the measurement error of flowmeter, it is difficult to realize personalized control for user self-regulation and control, and operation scheme of charging according to demand. In this case, operators and managers can only adopt the operation scheme of charging according to heating area, which will lead to unclear cost, that is, users may overpay, or there may be insufficient charging.

[0005] In order to solve the problem of measurement error of flowmeter, it is often necessary to restore factory precision, but it is necessary to have professional personnel on site to disassemble and clean or return to factory for recalibration, and the related operation of restoring factory precision requires high professional level of technical personnel, which is obviously difficult to realize in consideration of time and cost.

[0006] At present, there is no effective solution to the above problems on the market. SUMMARY

[0007] In view of the above technical problems in the related art, the utility model provides a flowmeter capable of realizing online calibration function, which can overcome the above shortcomings of the prior art.

[0008] To achieve the above technical purpose, the technical scheme of the utility model is as follows:

[0009] A flow meter capable of online calibration includes a regulating valve, a pipe section, and an integrator controller. The regulating valve and the pipe section are connected in series, and the integrator controller is connected to the regulating valve and the pipe section respectively.

[0010] An impeller is installed in the pipe section, and a permanent magnet synchronizer is connected to the upper end of the impeller. An electromagnetic damper and a magnetic pulse detector are installed on the outside of the pipe section to cooperate with the permanent magnet synchronizer. The electromagnetic damper, permanent magnet synchronizer and magnetic pulse detector together constitute an online calibration unit.

[0011] The totalizer controller includes a control communication unit, which is connected to the regulating valve, electromagnetic damper, and magnetic pulse detector via control wires. The control communication unit also includes a data storage unit. The impeller measures the water flow rate, and the electromagnetic damper serves a calibration function, only becoming active during calibration. The water flows from left to right, passing through the pipe section and the regulating valve in sequence.

[0012] Preferably, the pipe section is equipped with a return water temperature sensor, and the control communication unit is connected to the return water temperature sensor via a control wire.

[0013] Preferably, the return water temperature sensor is located in the pipe section.

[0014] Preferably, the control communication unit is further connected to a water supply temperature sensor via a control wire, and the water supply temperature sensor is installed at the water supply end of the system.

[0015] Preferably, the totalizer controller is also equipped with a display. The display can be used to display calibration data or equations, such as displaying various flow rates, impeller speed, the first relational equation, the second relational equation, and the final calibrated current flow rate. Q` wait.

[0016] Preferably, the data storage unit includes a database for storing, querying, and calculating data.

[0017] Preferably, the totalizer is connected to the regulating valve and the pipe section via two connecting posts. For example, the bottom or side of the totalizer can be connected to the regulating valve and the pipe section via two connecting posts, depending on the actual needs.

[0018] Preferably, the electromagnetic damper and the magnetic pulse detector are respectively located on both sides of the permanent magnet synchro. In implementation, the installation location and method of the electromagnetic damper and magnetic pulse detector can be determined according to actual needs, ideally installed on the outer side of the pipe section closest to the permanent magnet synchro. Auxiliary structures such as mounting blocks or connecting columns can be installed on the pipe section to install the electromagnetic damper and magnetic pulse detector, as long as they are as close as possible to the permanent magnet synchro and located on both sides of it.

[0019] Preferably, the permanent magnet synchronizer is located in the pipe section.

[0020] Preferably, the electromagnetic damper and the magnetic pulse detector are both located outside the pipe section.

[0021] The usage method of the provided flow meter depends on the actual needs. You can refer to the following steps:

[0022] S1 Initial factory calibration: The flow meter is set on the test equipment for calibration, and a first relational equation that can represent the correspondence between a specific impeller speed and a specific flow rate is calculated. The obtained data and the first relational equation are stored in the control communication unit respectively.

[0023] S1.1: By adjusting the opening of the regulating valve, n specific flow rates are given, and the corresponding n impeller specific speeds ZSC (e.g., ZSC1......ZSCn) and the specific flow rate values ​​Q (e.g., Q1.....Qn) of the flow meter are recorded respectively. Each specific flow rate is represented by the corresponding impeller specific speed ZSC, and the impeller specific speed ZSC and the specific flow rate value Q have a one-to-one correspondence; and n>=2;

[0024] The first relationship equation between the impeller and the impeller is calculated using the specific impeller speed ZSC and the specific flow rate Q: Q = f1(ZSC); where Q represents the specific flow rate corresponding to the specific impeller speed and ZSC represents the specific impeller speed.

[0025] S1.2: Start the electromagnetic damper, and by adjusting the opening of the regulating valve, give each of the specific flow rates (corresponding to each specific flow rate value Q) in S1.1 again, and record the n rated speeds ZSB (e.g., ZSB1......ZSBn) of each impeller under the action of the electromagnetic damper, so that each rated speed ZSB of each impeller and each specific speed ZSC (e.g., ZSC1......ZSCn) form a one-to-one correspondence;

[0026] S1.3: The first relational equation and the rated speed ZSB of each impeller are stored in the data storage unit of the control communication unit; each rated speed ZSB of each impeller corresponds one-to-one with each specific speed ZSC of each impeller, and the two respectively represent the impeller speed under the action of the electromagnetic damper and the impeller speed without the action of the electromagnetic damper.

[0027] S2 Factory Simulation Field Calibration: Start the electromagnetic damper, apply n different mechanical resistances to the impeller, measure the damped impeller speed ZSZ under the influence of each mechanical resistance, compare the damped impeller speed ZSZ with the impeller calibration speed ZSB in S1 and calculate the difference X, and calculate the second relationship equation between the difference X and the flow rate Q.

[0028] S2.1: Activate the electromagnetic damper;

[0029] S2.2: First, n different mechanical resistances are applied to the impeller. For each mechanical resistance, the opening of the regulating valve is adjusted to give each specific flow rate (corresponding to each specific flow rate value Q) in S1.1. The n damped impeller speeds ZSZ (such as ZSZ1......ZSZn) under the action of the electromagnetic damper and each mechanical resistance are recorded respectively. Thus, each damped impeller speed ZSZ and each specific impeller speed ZSB form a one-to-one correspondence.

[0030] S2.3: Compare the speed ZSZ and rated speed ZSB of each damped impeller -- that is, compare the difference between ZSZ and ZSB after adding mechanical resistance as a function of mechanical resistance. Calculate n differences X (e.g., X1....Xn) using the corresponding damped impeller speed ZSZ and rated speed ZSB.

[0031] The expression for the difference is: X i =|ZSZ i -ZSB i |,1<=i<=n, that is, the absolute value of the difference between the damped impeller speed ZSZ and the impeller rated speed ZSB;

[0032] S2.4: Turn off the electromagnetic damper, and for each difference X (such as X1....Xn) representing different mechanical resistances, detect the corresponding impeller speed and flow rate values ​​respectively, derive the second relationship equation between flow rate and impeller speed from the detection results, and store the second relationship equation into the data storage unit of the control communication unit;

[0033] The second equation relating the flow rate and the impeller speed is as follows: Q = f2(X); where X represents the difference and Q represents the flow rate.

[0034] S3 Implementation: The flow meter is installed and used in the implementation environment. The flow meter enters the operation phase and waits to receive online calibration commands.

[0035] S4 Monitoring and Calibration Command: The flow meter continuously monitors whether it receives the online calibration command; if yes, proceed to S5; otherwise, continue monitoring.

[0036] S5 performs online calibration: When an online calibration command is issued, the opening of the regulating valve is adjusted to read two sets of corresponding impeller speed data respectively, when the electromagnetic damper is in the off and on states. Calibration is performed by comparing the results of the comparison of the two sets of corresponding impeller speed data.

[0037] S5.1: When an online calibration command is issued, the impeller is brought to a specific speed ZSC (e.g., ZSC1......ZSCn) of each impeller in S1.1 by adjusting the opening of the regulating valve.

[0038] S5.2: Activate the electromagnetic damper and read the current impeller speed corresponding to n values ​​under the influence of the electromagnetic damper. ZSZ (like ZSZ1 `... ZSZn Current impeller speed ZSZ The corresponding current traffic is recorded as Q (e.g.) Q1 `... Qn `);

[0039] S5.3: Set the corresponding impeller calibration speed ZSB and current impeller speed... ZSZ Compare them separately;

[0040] S5.4: Based on the corresponding ZSB, ZSZ The difference between the two equations is selected from the first relational equation and the second relational equation to perform calibration and confirmation on the corresponding current flow Q`;

[0041] S5.4.1: Calculate the corresponding ZSB, ZSZ The current difference between ` X `, X `=| ZSZ `-ZSB|; X ` represents the corresponding ZSB, ZSZ The magnitude of the phase difference between them;

[0042] S5.4.2: If the corresponding ( X ` / ZSB)<=M%, representing the corresponding ZSB, ZSZ Since there are no significant differences between them and the effects of the electromagnetic damper and mechanical resistance do not need to be considered, the corresponding current flow rate can be obtained simply by substituting the specific impeller speed ZSC of each impeller into the first relationship equation. Q` Therefore, based on the current flow rate Q` =f1(ZSC) is used for calculation, that is, to set the corresponding current flow. Q` The first relational equation is used as the calibration confirmation; and 0.01 <= M <= 20;

[0043] Otherwise, it means the corresponding ZSB, ZSZ There are significant differences between them, and the effects of the electromagnetic damper and mechanical resistance need to be considered. Therefore, the corresponding current difference value will be... X Substituting into the second relational equation, i.e., according to the current flow rate Q `=f2( X `) Run, that is, set the corresponding current traffic. Q` Perform calibration and verification according to the second relational equation;

[0044] S5.5: The current flow rate calculated in S5.4 Q` The output value of the flow detection signal of the flow meter is transmitted to the totalizing controller and the control communication unit, thus completing the online calibration.

[0045] S6 Resumption of Execution and Monitoring: After the online calibration work in S5 is completed, the flow meter resumes metering and control operation, and should continue to monitor the next calibration command before returning to S4.

[0046] Preferably, the value range of n depends on actual needs, and is preferably 2-30, representing a specific flow rate, a specific impeller speed ZSC, an impeller calibration speed ZSB, a damped impeller speed ZSZ, a difference X, and the current impeller speed. ZSZ The number of `.

[0047] Preferably, the value range of M is determined according to actual needs, and is preferably 1-5, representing the set impeller calibration speed ZSB and the current impeller speed. Figure 1 The phase difference reaches a threshold where the effects of electromagnetic dampers or mechanical resistance need to be considered.

[0048] Preferably, the values ​​of each mechanical resistance are in a regularly increasing or decreasing sequence, or exhibit a linear relationship. Of course, other existing technologies can also be referenced. The purpose of mechanical resistance is to simulate the obstruction force, water flow impact force, and external impact force caused by scale, rust, impurities in the water flow, etc. For example, the mechanical resistance values ​​can be 1, 2, 3, ... M, or 1, 3... 3 × M, where M is an integer, and the unit of mechanical resistance is N.

[0049] Preferably, the faults experienced by the flow meter can be impacts, equipment failures, or accidents such as power outages followed by power restoration.

[0050] Preferably, the first and second relational equations are determined according to actual needs, and both are preferably univariate linear equations, which facilitates calculation. The first relational equation actually represents the relationship between impeller speed and flow rate without considering the effects of mechanical resistance, electromagnetic dampers, and other influencing factors. The second relational equation actually represents the relationship between the difference X between the impeller's rated speed and its non-rated speed and the flow rate Q.

[0051] The beneficial effects of this design are as follows: This utility model has a simple structure and is easy to operate. An online calibration unit is constructed using an electromagnetic damper, a permanent magnet synchronizer, and a magnetic pulse detector. Combined with a regulating valve, pipe section, integrator controller, and water temperature sensor, it can acquire accurate data at all times to assist in calibration. This product can, upon leaving the factory, summarize the relationship between flow rate and rotational speed from measured speed and flow rate data. Furthermore, it can calculate the relationship between the difference between simulated impeller speed at a specific speed and impeller speed under mechanical influence, and separately calculate the relationship between the flow rate and rotational speed equation, and the relationship between the difference under mechanical influence and flow rate. After calibration using this product and its method, flow rate calibration can be performed automatically based on the relationship between flow rate and rotational speed equation and the relationship between the difference and flow rate equation. This achieves calibration using dual measurement standards, and is applicable to implementation scenarios with minimal or non-negligible external influences, making flow rate measurement, control, and calibration more accurate and flexible.

[0052] Compared to existing flow meters, this product has the following advantages:

[0053] (A) Employing online calibration units, remote monitoring can be achieved on the host computer platform and control terminal. This enables unmanned, automatic online calibration, constantly correcting errors caused by long-term pipe buildup and installation location, ensuring consistently accurate uploaded data. Manual calibration is also possible, offering flexible operation modes to better meet market needs.

[0054] (B) By adopting online calibration units and other methods, the detection accuracy can be improved, which will inevitably improve the control accuracy. The higher the control accuracy, the more obvious the energy-saving effect.

[0055] (C) It allows for more convenient personalized control and on-demand metering billing, enabling users to adjust and manage their systems more easily. This expands the energy-saving avenues for heating systems, motivates users to conserve energy, and significantly reduces heat resources.

[0056] (D) Online calibration can be easily achieved on the host computer platform and control terminal through the collaboration of online calibration units, regulating valves, pipe sections and totalizers, etc. The operation is very simple, the professional requirements of relevant personnel are very low, and it has a good cost performance.

[0057] (E) Electromagnetic dampers allow for timed or random unattended online calibration, eliminating errors caused by installation location and pipeline contamination, achieving maintenance-free high-precision metering and accurate flow control. The online calibration function eliminates errors caused by installation, long-term operation, and accumulated contaminants in the pipeline; eliminates the need for on-site maintenance and factory calibration; and ensures the metering accuracy of the product throughout its service life.

[0058] (F). Although this utility model is described using water supply as an example, in fact, this utility model can be applied to other media besides water supply, and is applicable to a variety of application scenarios. Attached Figure Description

[0059] The present invention will now be described in further detail with reference to the accompanying drawings.

[0060] Figure 2 This is a front-view cross-sectional view of the flow meter of this utility model. The arrows in the figure represent the direction of water flow, indicating that the water flows from left to right, that is, from the pipe section to the regulating valve.

[0061] Figure 3 This is a top view of the online calibration unit (electromagnetic damper, permanent magnet synchronizer, magnetic pulse detector) of this utility model.

[0062] Figure 4 This is a schematic diagram of the control and communication connection principle in this utility model, namely, a connection diagram of the regulating valve, electromagnetic damper, magnetic pulse detector, return water temperature sensor, supply water temperature sensor and control communication unit.

[0063] Figures 1-4 This is a flowchart illustrating the usage method of the flow meter described in this utility model. Detailed Implementation

[0064] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0065] like ZSZ As shown, in order to facilitate understanding of the above technical solution of this utility model, the above technical solution of this utility model will be described in detail below through specific usage methods.

[0066] The flow meter capable of online calibration includes a regulating valve 1, a pipe section 2, and an integrator 9. The regulating valve 1 and the pipe section 2 are connected in series, and the integrator 9 is connected to the regulating valve 1 and the pipe section 2 respectively.

[0067] The pipe section 2 is equipped with an impeller 4, and a permanent magnet synchronizer 5 is connected to the upper end of the impeller 4. An electromagnetic damper 3 and a magnetic pulse detector 6, which are corresponding to and cooperate with the permanent magnet synchronizer 5, are provided on the outside of the pipe section 2. The electromagnetic damper 3, the permanent magnet synchronizer 5, and the magnetic pulse detector 6 together constitute an online calibration unit.

[0068] The totalizer 9 includes a control communication unit 10, which is connected to the regulating valve 1, the electromagnetic damper 3, and the magnetic pulse detector 6 via control wires. The control communication unit 10 also includes a data storage unit. The impeller 4 measures the water flow rate, and the electromagnetic damper 3 serves a calibration function, only functioning during calibration. The water flows from left to right, passing through pipe section 2 and regulating valve 1 in sequence.

[0069] In one possible embodiment, pipe section 2 is equipped with a return water temperature sensor 7, and the control communication unit 10 is connected to the return water temperature sensor 7 via a control wire.

[0070] In one possible embodiment, the return water temperature sensor 7 is located in pipe section 2.

[0071] In one possible embodiment, the control communication unit 10 is further connected to a water supply temperature sensor 8 via a control wire, and the water supply temperature sensor 8 is installed at the water supply end of the system.

[0072] In one possible embodiment, the integrator controller 9 is further provided with a display 11. The display 11 can be used to display calibration data or equations, such as displaying various flow rates, impeller 4 rotational speed, the first relational equation, the second relational equation, and the final calibrated current flow rate. Q` wait.

[0073] In one possible embodiment, the data storage unit includes a database for storing, querying, and calculating data.

[0074] In one possible embodiment, the totalizer 9 is connected to the regulating valve 1 and the pipe section 2 via two connecting posts 12. For example, the bottom or side of the totalizer 9 can be connected to the regulating valve 1 and the pipe section 2 via two connecting posts 12, depending on the actual needs.

[0075] In one possible embodiment, the electromagnetic damper 3 and the magnetic pulse detector 6 are respectively disposed on both sides of the permanent magnet synchro 5. In practice, the placement and arrangement of the electromagnetic damper 3 and the magnetic pulse detector 6 can be determined according to actual needs, ideally installed on the outer side of the pipe section 2 closest to both sides of the permanent magnet synchro 5. Auxiliary structures such as mounting blocks 13 or connecting columns 12 can be installed on the pipe section 2 to mount the electromagnetic damper 3 and the magnetic pulse detector 6, as long as the electromagnetic damper 3 and the magnetic pulse detector 6 are as close as possible to the permanent magnet synchro 5 and located on its sides.

[0076] In one possible embodiment, the permanent magnet synchronizer 5 is preferably located in the pipe section 2.

[0077] In one possible embodiment, both the electromagnetic damper 3 and the magnetic pulse detector 6 are located outside the pipe section 2.

[0078] The usage method of the provided flow meter depends on the actual needs. You can refer to the following steps:

[0079] S1 Initial factory calibration: The flow meter is set on the test equipment for calibration, and a first relational equation that can represent the correspondence between a specific impeller speed and a specific flow rate is calculated. The obtained data and the first relational equation are stored in the control communication unit 10 respectively.

[0080] S1.1: By adjusting the opening of the regulating valve 1, n specific flow rates are given, and the specific impeller speeds ZSC (e.g., ZSC1......ZSCn) corresponding to the n impellers 4 and the specific flow rate values ​​Q (e.g., Q1.....Qn) corresponding to the flow meters are recorded respectively. Each specific flow rate is represented by the corresponding impeller speed ZSC, and the impeller speed ZSC and the specific flow rate value Q have a one-to-one correspondence; and n>=2;

[0081] The first relationship equation between the impeller and the impeller is calculated using the specific impeller speed ZSC and the specific flow rate Q: Q = f1(ZSC); where Q represents the specific flow rate corresponding to the specific impeller speed and ZSC represents the specific impeller speed.

[0082] S1.2: Start the electromagnetic damper 3, and adjust the opening of the regulating valve 1 to give each of the specific flow rates (corresponding to each specific flow rate value Q) in S1.1 again, and record the n rated speeds ZSB (such as ZSB1......ZSBn) of each impeller 4 under the action of the electromagnetic damper 3, so that each rated speed ZSB of the impeller and each specific speed ZSC (such as ZSC1......ZSCn) form a one-to-one correspondence;

[0083] S1.3: The first relational equation and the rated speed ZSB of each impeller are stored in the data storage unit of the control communication unit 10; the rated speed ZSB of each impeller corresponds one-to-one with the specific speed ZSC of each impeller, and the two respectively represent the impeller speed under the action of the electromagnetic damper 3 and the impeller speed without the action of the electromagnetic damper 3.

[0084] S2 Factory Simulation Field Calibration: Start the electromagnetic damper 3, apply n different mechanical resistances to the impeller 4 respectively, measure the damped impeller speed ZSZ under the influence of each mechanical resistance, compare the damped impeller speed ZSZ with the impeller calibration speed ZSB in S1 and calculate the difference X, calculate the second relationship equation between the difference X and the flow rate Q;

[0085] S2.1: Activate the electromagnetic damper 3;

[0086] S2.2: First, n different mechanical resistances are applied to the impeller 4. For each mechanical resistance, the opening of the regulating valve 1 is adjusted to give each specific flow rate (corresponding to each specific flow rate value Q) in S1.1. The n damped impeller speeds ZSZ (such as ZSZ1......ZSZn) under the action of the electromagnetic damper 3 and each mechanical resistance are recorded respectively. Thus, each damped impeller speed ZSZ and each specific impeller speed ZSB form a one-to-one correspondence.

[0087] S2.3: Compare the speed ZSZ and rated speed ZSB of each damped impeller -- that is, compare the difference between ZSZ and ZSB after adding mechanical resistance as a function of mechanical resistance. Calculate n differences X (e.g., X1....Xn) using the corresponding damped impeller speed ZSZ and rated speed ZSB.

[0088] The expression for the difference is: X i =|ZSZ i -ZSB i |,1<=i<=n, that is, the absolute value of the difference between the damped impeller speed ZSZ and the impeller rated speed ZSB;

[0089] S2.4: Turn off the electromagnetic damper 3, and for each difference X (such as X1....Xn) representing different mechanical resistances, detect the speed and flow rate of the impeller 4 respectively, derive the second relationship equation between flow rate and impeller speed from the detection results, and store the second relationship equation into the data storage unit of the control communication unit 10.

[0090] The second equation relating the flow rate and the impeller speed is as follows: Q = f2(X); where X represents the difference and Q represents the flow rate.

[0091] S3 Implementation: The flow meter is installed and used in the implementation environment. The flow meter enters the operation phase and waits to receive online calibration commands.

[0092] S4 Monitoring and Calibration Command: The flow meter continuously monitors whether it receives the online calibration command; if yes, proceed to S5; otherwise, continue monitoring.

[0093] S5 performs online calibration: When an online calibration command is issued, the opening of the regulating valve 1 is adjusted to read two sets of corresponding impeller speed data respectively, in the closed and open states of the electromagnetic damper 3. The calibration is performed by comparing the results of the comparison of the two sets of corresponding impeller speed data.

[0094] S5.1: When an online calibration command is issued, the impeller 4 is made to reach the specified speed ZSC (e.g., ZSC1......ZSCn) of each impeller in S1.1 by adjusting the opening of the regulating valve 1.

[0095] S5.2: Activate the electromagnetic damper 3 and read the current impeller speed corresponding to n values ​​under the influence of the electromagnetic damper 3. ZSZ1 (like ZSZn `... ZSZ Current impeller speed Qn The corresponding current traffic is recorded as Q (e.g.) Q1 `... ZSZ `);

[0096] S5.3: Set the corresponding impeller calibration speed ZSB and current impeller speed... ZSZ Compare them separately;

[0097] S5.4: Based on the corresponding ZSB, ZSZ The magnitude of the difference between them is selected from the first relational equation and the second relational equation to determine the corresponding current flow. Q` Perform calibration verification;

[0098] S5.4.1: Calculate the corresponding ZSB, ZSZ The current difference between ` X `, X `=| ZSZ `-ZSB|; X ` represents the corresponding ZSB, ZSZ The magnitude of the phase difference between them;

[0099] S5.4.2: If the corresponding ( X` / ZSB)<=M%, representing the corresponding ZSB, ZSZ There are no significant differences between them, and the effects of the electromagnetic damper 3 and mechanical resistance do not need to be considered. The current flow rate can be obtained by substituting the specific speed ZSC of each impeller into the first relationship equation. Q` Therefore, based on the current flow rate Q` =f1(ZSC) is used for calculation, that is, to set the corresponding current flow. Q` The first relational equation is used as the calibration confirmation; and 0.01 <= M <= 20;

[0100] Otherwise, it means the corresponding ZSB, ZSZ There are significant differences between them, and the effects of the electromagnetic damper 3 and mechanical resistance need to be considered. Therefore, the corresponding current difference value will be... X Substituting into the second relational equation, i.e., according to the current flow rate Q `=f2( X `) Run, that is, set the corresponding current flow Q` and perform calibration confirmation according to the second relationship equation;

[0101] S5.5: The current flow rate calculated in S5.4 Q` The output value of the flow detection signal of the flow meter is transmitted to the totalizing controller 9 and the control communication unit 10, thus completing the online calibration work;

[0102] S6 Resumption of Execution and Monitoring: After the online calibration work in S5 is completed, the flow meter resumes metering and control operation, and should continue to monitor the next calibration command before returning to S4.

[0103] In one possible embodiment, the value of n is determined according to actual needs, preferably 2-30, representing a specific flow rate, a specific impeller speed ZSC, an impeller calibration speed ZSB, a damped impeller speed ZSZ, a difference X, and the current impeller speed. ​ The quantity.

[0104] In one possible embodiment, the value of M is determined according to actual needs, preferably 1-5, representing the set impeller calibration speed ZSB and the current impeller speed. ​ The phase difference reaches a threshold where the effects of the electromagnetic damper 3 or mechanical resistance need to be considered.

[0105] In one possible embodiment, the values ​​of the mechanical resistances are preferably in a regularly changing increasing or decreasing sequence, or in a linear relationship; of course, they can also be implemented with reference to other existing technologies. The purpose of the mechanical resistance is to simulate the obstruction force, water flow impact force, and external impact force caused by scale, rust, impurities in the water flow, etc. The mechanical resistance values ​​can be 1, 2, 3, ... M, or 1, 3...3 × M, where M is an integer, and the unit of mechanical resistance is N.

[0106] In one possible embodiment, the fault experienced by the flow meter can be an impact, equipment failure, or an accident during power restoration after a power outage.

[0107] In one possible embodiment, the first and second relational equations are specifically determined according to actual needs, and are preferably univariate linear equations, which facilitates calculation. The first relational equation actually represents the relationship between impeller speed and flow rate without considering the influence of factors such as mechanical resistance and electromagnetic damper 3. The second relational equation actually represents the relationship between the difference X between the impeller's rated speed and its non-rated speed and the flow rate Q.

[0108] Factory calibration stage (including S1 and S2): Because the electromagnetic damper 3 has a certain impact on the speed of the impeller 4 when it is in the starting state, it is necessary to measure the impeller's rated speed ZSB when the electromagnetic damper 3 is in the starting state. Therefore, in S1, for the electromagnetic damper 3 in the off and on states, the same specific flow rate (corresponding to each specific flow rate value Q, Q including Q1...Qn) is given respectively, thereby obtaining the impeller's specific speed ZSC (such as ZSC1...ZSCn) when the electromagnetic damper 3 is in the off state and the impeller's rated speed ZSB (including ZSB1...ZSBn) when the electromagnetic damper 3 is in the on state. The first relationship equation is derived by using the specific flow rate value Q and the impeller's specific speed ZSC, which is used for calibration work when the influence of the electromagnetic damper 3 and mechanical force is negligible during subsequent implementation.

[0109] With both mechanical force and electromagnetic damper 3 activated simultaneously, both will affect the rotational speed of impeller 4. Therefore, given the same specific flow rates (corresponding to specific flow rate values ​​Q: Q1...Qn), the n damped impeller rotational speeds ZSZ (e.g., ZSC1...ZSCn) under the action of electromagnetic damper 3 and various mechanical resistances are measured. The corresponding difference X (including X1...Xn) is calculated using the corresponding damped impeller rotational speed ZSZ and the impeller calibration speed ZSB. Combining the difference X with the specific flow rate value Q, a second relational equation is obtained, used for calibration work when the influence of electromagnetic damper 3 and mechanical force cannot be ignored in subsequent implementations. In this utility model, the mechanical resistance applied in S2 simulates various influencing factors that may cause calibration errors, such as the obstruction force caused by scale, rust, impurities in the water flow, etc., water flow impact force, and external impact force generated in daily use. The second relational equation considering the influence of electromagnetic damper 3 and mechanical resistance is obtained through S2.

[0110] Online calibration phase during implementation (S3, S4, S5): After the flow meter is put into operation, after powering on the totalizer 9 and control communication unit 10, the flow meter continuously monitors and waits for the online calibration command in S4. If the online calibration command is received, it enters the online calibration phase in S5. After calibration, it returns to the monitoring phase in S4 via S6. S3 and S4 can not only serve as the initial calibration steps for the flow meter under the operating environment before it is officially put into flow measurement work, but also serve as multiple online calibrations after repeatedly receiving online calibration commands, thus better adapting to changes in the flow meter during use and operation and more accurately measuring the flow. Data is obtained and measured by the magnetic pulse detector 6 and the control communication unit 10 in the totalizer 9, and the relevant speed and water temperature parameters of the impeller 4 are measured. The relevant data of the water temperature parameters can be measured by the return water temperature sensor 7 and the supply water temperature sensor 8 and transmitted to the control communication unit 10. The control communication unit 10 calculates the instantaneous parameters and cumulative parameters of the water flow speed, flow rate, etc. The control communication unit 10 sends the collected or calculated instantaneous parameters, cumulative parameters, valve opening degree, and operating status to the host computer platform or controller. The control communication unit 10 receives and executes the operation and calibration commands issued by the host computer platform or controller, coordinating the operation of the regulating valve 1, electromagnetic damper 3, magnetic pulse detector 6, return water temperature sensor 7, and supply water temperature sensor 8. The regulating valve 1 can operate manually or automatically, thereby adjusting different control parameters. The impeller 4 speed is used to measure the water flow rate, and the electromagnetic damper 3 is used to calibrate accurate impeller 4 speed data to assist in the calibration process.

[0111] In summary, through the aforementioned unique technical solution, this utility model features a simple structure and convenient operation. An online calibration unit, comprised of an electromagnetic damper, a permanent magnet synchronizer, and a magnetic pulse detector, combined with a regulating valve, pipe section, integrator controller, and water temperature sensor, can continuously acquire accurate data to assist in calibration. This product, upon leaving the factory, can summarize the relationship between flow rate and rotational speed from measured speed and flow rate data. Furthermore, it can calculate the relationship between the difference between simulated impeller speed at a specific speed and impeller speed under mechanical influence, and separately calculate the relationship between flow rate and rotational speed, as well as the relationship between the difference under mechanical influence and flow rate. After calibration using this product and its method, flow rate calibration can be performed automatically based on the relationship between flow rate and rotational speed, and the relationship between the difference and flow rate. This achieves calibration using dual measurement standards, applicable to both scenarios with minimal and significant external influences, making flow rate measurement, control, and calibration more accurate and flexible.

[0112] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

Claims

1. A flow meter capable of online calibration, characterized in that, It includes a regulating valve (1), a pipe section (2) and an accumulator controller (9). The regulating valve (1) and the pipe section (2) are connected in series with each other, and the accumulator controller (9) is connected to the regulating valve (1) and the pipe section (2) respectively. The pipe section (2) is provided with an impeller (4), and a permanent magnet synchronizer (5) is connected to the upper end of the impeller (4). An electromagnetic damper (3) and a magnetic pulse detector (6) corresponding to the permanent magnet synchronizer (5) are provided on the outside of the pipe section (2). The electromagnetic damper (3), the permanent magnet synchronizer (5), and the magnetic pulse detector (6) together constitute an online calibration unit. The totalizer (9) is provided with a control communication unit (10), which is connected to the regulating valve (1), the electromagnetic damper (3), and the magnetic pulse detector (6) through control wires; the control communication unit (10) includes a data storage unit.

2. The flow meter as described in claim 1, characterized in that, The pipe section (2) is equipped with a return water temperature sensor (7), and the control communication unit (10) is connected to the return water temperature sensor (7) through a control wire.

3. The flow meter as described in claim 2, characterized in that, The return water temperature sensor (7) is located in the pipe section (2).

4. The flow meter as described in claim 1, characterized in that, The control communication unit (10) is also connected to a water supply temperature sensor (8) via a control wire. The water supply temperature sensor (8) is installed at the water supply end of the system.

5. The flow meter as described in claim 1, characterized in that, The totalizer controller (9) is also equipped with a display (11); The data storage unit includes a database for storing, querying, and calculating data.

6. The flow meter as described in claim 1, characterized in that, The totalizer (9) is connected to the regulating valve (1) and the pipe section (2) via two connecting posts (12).

7. The flow meter as described in claim 1, characterized in that, The electromagnetic damper (3) and the magnetic pulse detector (6) are respectively located on both sides of the permanent magnet synchronizer (5), and both the electromagnetic damper (3) and the magnetic pulse detector (6) are located outside the pipe section (2).

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