Flowmeter capable of realizing online calibration function and use method thereof

Abstract

The invention relates to a flowmeter capable of realizing an online calibration function, which comprises a regulating valve, a pipe section and an integrating controller, the regulating valve and the pipe section are 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 present disclosure relates to the field of flow meters. Specifically, it relates to a flow meter capable of realizing an online calibration function and its usage method. By integrating an electromagnetic damper and a regulating valve, it can achieve automatic or manual online calibration of the flow rate, and is applicable to systems such as heating, heat metering, air conditioning, water supply, and billing. Background Art

[0002] As is well known, flow meter calibration refers to calibrating a flow meter to ensure its measurement accuracy and precision. As an important instrument for measuring fluid flow, flow meters play an irreplaceable role in industrial production, environmental monitoring, energy metering, and other fields. However, due to various factors such as scale, medium impurities, external impacts, component aging and damage, and rust, the measurement accuracy of the flow meter may gradually decrease, or even lead to data distortion. Therefore, it is particularly important to calibrate the flow meter regularly.

[0003] For existing metering instruments such as flow meters, once installed at the usage site or after being used for a period of time, their detection errors will gradually increase over time. Especially in usage scenarios such as heating and heating users, due to limitations such as installation location, cleanliness of the heating medium, and external impacts, the phenomenon of inaccurate metering will gradually become serious, extremely likely to lead to misjudgment of flow parameters, and further seriously affect heat distribution and control work, making relevant metering statistics and metering charges lose a reliable basis.

[0004] Due to the inaccurate metering of the flow meter, it will be difficult to implement personalized control for users' independent adjustment and management, as well as operation plans for metering according to demand. In response to this situation, operators, managers, etc. often can only adopt an operation plan of charging according to the heating area, which in turn leads to unclear revenue and cost, that is, there may be a situation where users overpay, or there may be a situation of insufficient charging.

[0005] To solve the problem of inaccurate metering of the flow meter, it is often necessary to restore the factory accuracy. However, restoring the factory accuracy requires professional personnel to disassemble and clean on-site or return to the factory for re-calibration, and the relevant operations for restoring the factory accuracy have too high requirements for the professional level of technicians, and it is obviously difficult to achieve considering time, cost, etc.

[0006] In response to the above problems, there is currently no effective solution on the market. Summary of the Invention

[0007] In view of the above technical problems in the related art, the present disclosure proposes a flow meter capable of realizing an online calibration function, which can overcome the above-mentioned deficiencies of the prior art.

[0008] To achieve the above technical objectives, the technical solution of the present disclosure is realized as follows: An object of the present disclosure is to provide a flow meter capable of realizing an online calibration function, including a regulating valve, a pipe section, and an integrating controller. The regulating valve and the pipe section are connected in series, and the integrating controller is connected to the regulating valve and the pipe section respectively; An impeller is provided in the pipe section. A permanent magnet synchronizer is connected to the upper end of the impeller. An electromagnetic damper and a magnetic pulse detector corresponding to the permanent magnet synchronizer are provided outside the pipe section. The electromagnetic damper, the permanent magnet synchronizer, and the magnetic pulse detector together constitute an online calibration unit; A control communication unit is provided in the integrating controller. The control communication unit is connected to the regulating valve, the electromagnetic damper, and the magnetic pulse detector respectively through control wires; the control communication unit includes a data storage unit. The impeller serves to measure the water flow rate, and the electromagnetic damper serves to calibrate, and the electromagnetic damper only functions during calibration. The water flow flows through the pipe section and the regulating valve from left to right in sequence.

[0009] Preferably, a return water temperature sensor is provided in the pipe section, and the control communication unit is connected to the return water temperature sensor through a control wire.

[0010] Preferably, the return water temperature sensor is located in the pipe section.

[0011] Preferably, the control communication unit is further connected to a supply water temperature sensor through a control wire, and the supply water temperature sensor is installed at the supply end of the system.

[0012] Preferably, a display is further provided on the integrating controller. The display can be used to display calibration data or equations, such as displaying various flow values, impeller speeds, the first relationship equation, the second relationship equation, the current flow rate of the final calibration, etc. Q` etc.

[0013] Preferably, the data storage unit includes a database for storage, query, and calculation.

[0014] Preferably, the integrating controller is connected to the regulating valve and the pipe section respectively through two connection posts. For example, the bottom or side of the integrating controller can be connected to the regulating valve and the pipe section respectively through two connection posts, which is determined according to actual needs.

[0015] Preferably, the electromagnetic damper and the magnetic pulse detector are respectively arranged on both sides of the permanent magnet synchronizer. During implementation, the installation positions and installation methods of the electromagnetic damper and the magnetic pulse detector can be determined according to actual needs, and they should be installed on the outer side of the pipe section closest to both sides of the permanent magnet synchronizer as much as possible. Auxiliary structures such as mounting blocks or connection posts can be provided on the pipe section to install the electromagnetic damper and the magnetic pulse detector, as long as it is ensured that the electromagnetic damper and the magnetic pulse detector are as close to the permanent magnet synchronizer as possible and are located on both sides of it.

[0016] Preferably, the permanent magnet synchronizer is preferably located in the pipe section.

[0017] Preferably, the electromagnetic damper and the magnetic pulse detector are both located outside the pipe section.

[0018] Another object of the present disclosure is to provide a method for using the flow meter provided by the previous object, including the following steps: S1 Factory initial calibration: Set the flow meter on the test equipment for calibration, calculate the first relationship equation that can represent the corresponding relationship between a specific impeller speed and a specific flow rate, and store the obtained data and the first relationship equation into the control communication unit respectively; S1.1: Given n specific flow rates by adjusting the opening degree of the regulating valve, respectively record the corresponding n specific impeller speeds ZSC (such as ZSC1......ZSCn) of the corresponding impellers and the corresponding specific flow rate values Q (such as Q1.....Qn) of the flow meter. Each of the specific flow rates is represented by the corresponding specific impeller speed ZSC. The specific impeller speed ZSC and the specific flow rate value Q have a one-to-one correspondence relationship; and n >= 2; Calculate the first relationship equation between the two through each specific impeller speed ZSC and specific flow rate value Q: Q = f1(ZSC); where Q represents the specific flow rate value corresponding to a specific impeller speed, and ZSC represents the specific impeller speed; S1.2: Start the electromagnetic damper, and again give each of the specific flow rates in S1.1 (corresponding to each specific flow rate value Q) by adjusting the opening degree of the regulating valve, and respectively record the n calibrated impeller speeds ZSB (such as ZSB1......ZSBn) of the impellers under the action of the electromagnetic damper, so that each calibrated impeller speed ZSB and each specific impeller speed ZSC (such as ZSC1......ZSCn) form a one-to-one correspondence relationship; S1.3: Store the first relationship equation and each calibrated impeller speed ZSB into the data storage unit of the control communication unit; each calibrated impeller speed ZSB and each specific impeller speed ZSC respectively correspond one by one, 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; S2 Factory simulation of on-site calibration: Start the electromagnetic damper, apply n different mechanical resistances to the impeller respectively, measure the corresponding damped impeller speeds ZSZ under the influence of each mechanical resistance respectively, compare the damped impeller speed ZSZ with the calibrated impeller speed ZSB in S1 and calculate the difference X, and calculate the second relationship equation between the difference X and the flow rate Q; S2.1: Start the electromagnetic damper; S2.2: Apply n different mechanical resistances to the impeller first. For each of the mechanical resistances, adjust the opening of the regulating valve to respectively set each of the specific flows in S1.1 (corresponding to each specific flow value Q), and respectively record the rotational speeds ZSZ of the damped impellers (such as ZSZ1......ZSZn) under the action of the electromagnetic damper and each of the mechanical resistances. Thus, a one-to-one correspondence is formed between each of the rotational speeds ZSZ of the damped impellers and each of the specific rotational speeds ZSB of the impeller; S2.3: Compare the rotational speeds ZSZ of the damped impellers and the calibrated rotational speed ZSB of the impeller - that is, compare the change value of the difference between ZSZ and ZSB after adding the mechanical resistance with respect to the mechanical resistance. Through each corresponding rotational speed ZSZ of the damped impeller and the calibrated rotational speed ZSB of the impeller, calculate n differences X (such as X1....Xn); The expression formula for the difference is: X i =|ZSZ i -ZSB i |, 1 <= i <= n, that is, the absolute value after subtracting the corresponding rotational speed ZSZ of the damped impeller and the calibrated rotational speed ZSB of the impeller; S2.4: Turn off the electromagnetic damper. For each of the differences X (such as X1....Xn) representing different mechanical resistances, respectively detect the rotational speed and flow value of the corresponding impeller, and derive the second relationship equation between the flow and the rotational speed of the impeller from the detection results, and store the second relationship equation in the data storage unit of the control communication unit; The second relationship equation between the flow and the rotational speed of the impeller is as follows: Q = f2(X); where X represents the difference and Q represents the flow value; S3 Implementation: Install the flow meter in the implementation environment for use. The flow meter enters the usage and operation stage and waits to receive an online calibration command; S4 Monitor Calibration Command: The flow meter continuously monitors whether it receives the online calibration command; if so, enter S5; otherwise, continue to monitor; S5 Execute Online Calibration: When the online calibration command appears, respectively in the off and on states of the electromagnetic damper, adjust the opening of the regulating valve, and respectively read two sets of corresponding rotational speed data of the impeller, and perform calibration through the comparison result of the two sets of corresponding rotational speed data; S5.1: When the online calibration command appears, through the opening of the regulating valve, make the impeller reach each of the specific rotational speeds ZSC (such as ZSC1......ZSCn) of the impeller in S1.1; S5.2: Turn on the electromagnetic damper and read the current rotational speed of the corresponding impeller affected by the n electromagnetic dampers ZSZ` (such as ZSZ1 `...ZSZn `), current impeller speed ZSZ` The corresponding current flow is recorded as Q `(such as Q1 `... Qn `); S5.3: The corresponding impeller calibrated speed ZSB and current impeller speed ZSZ `Compare separately; S5.4: According to the corresponding ZSB, ZSZ` The difference between the two is selected from the first relationship equation and the second relationship equation to calculate the corresponding current flow rate. Q` Perform calibration confirmation; S5.4.1: Calculate the corresponding ZSB, ZSZ The current difference between ` X `, X `=| ZSZ `-ZSB|; X `Represents the corresponding ZSB, ZSZ` The difference between S5.4.2: If the corresponding ( X ` / ZSB)<=M%, represents the corresponding ZSB, ZSZ There is no obvious difference between them and there is no need to consider the influence of the electromagnetic damper and mechanical resistance. The corresponding current flow rate can be obtained by substituting the specific speed ZSC of each impeller into the first relationship equation. Q` , so according to the current flow Q` = f1(ZSC) is calculated, that is, the corresponding current flow is set Q` The calibration is performed according to the first relational equation; and 0.01<=M<=20; Otherwise, it indicates the corresponding ZSB, ZSZ There is a significant difference between them, and the influence of the electromagnetic damper and mechanical resistance needs to be considered. X Substitute into the second relational equation, that is, according to the current flow Q `=f2( X `) operation, i.e. setting the corresponding current flow Q` to perform calibration confirmation according to the second relationship equation; S5.5: The current flow calculated in S5.4 Q` , as the flow detection signal output value of the flow meter, is transmitted to the integrator controller and the control communication unit, thus completing the online calibration work; S6 resumes execution and monitoring: After the online calibration work in S5 is completed, the flow meter resumes metering control operation, and should continue to monitor the next calibration command and return to S4.

[0019] Preferably, the value range of n depends on actual needs, and is preferably 2 - 30, representing the number of specific flow rates, specific impeller rotation speeds ZSC, rated impeller rotation speeds ZSB, impeller rotation speeds with damping ZSZ, differences X, and current impeller rotation speeds. ZSZ `.

[0020] Preferably, the value range of M depends on actual needs, and is preferably 1 - 5, representing the set rated impeller rotation speed ZSB and the current impeller rotation speed ZSZ` The difference amplitude reaches a threshold value that requires considering the influence of the electromagnetic damper or mechanical resistance, etc.

[0021] Preferably, the values of each of the mechanical resistances preferably form an increasing or decreasing sequence with regular changes, or a linear change relationship. Of course, it can also be implemented with reference to other existing technologies. The purpose of the mechanical resistance is to simulate the resistance forces, water flow impact forces, external impact forces, etc. brought by scale, rust, impurities in the water flow, etc. For example, the mechanical resistance values are 1, 2, 3,... M, or 1, 3... 3×M, where M is an integer, and the unit of the mechanical resistance is N.

[0022] Preferably, the faults experienced by the flow meter can be impacts, equipment failures, etc., and can also be accidents such as power restoration after a power outage.

[0023] Preferably, the first relationship equation and the second relationship equation specifically depend on actual needs, and are both preferably linear equations with one variable, which is more convenient for calculation. The first relationship equation actually represents the relationship between the impeller rotation speed and the flow rate without considering the influence factors such as mechanical resistance and electromagnetic damper. The second relationship equation actually represents the relationship equation between the difference X between the rated impeller rotation speed and the non-rated impeller rotation speed and the flow rate Q.

[0024] The beneficial effects achieved by this design: The present disclosure has a simple structure and convenient operation. An online calibration unit is jointly constituted by an electromagnetic damper, a permanent magnet synchronous machine, and a magnetic pulse detector, and then in cooperation with a regulating valve, a pipe section, an integrating controller, and a water temperature sensor, accurate data can be obtained at all times to assist the calibration work. When the product leaves the factory, the relationship equation between the flow rate and the rotation speed can be summarized by measuring the rotation speed, flow rate data, etc., and the relationship equation between the difference value and the flow rate can be summarized and calculated by simulating the difference between the specific impeller rotation speed and the impeller rotation speed data affected by mechanical forces, etc. The flow rate calibration work can also be carried out respectively through the relationship equation between the flow rate and the rotation speed, and the relationship equation between the difference value affected by mechanical forces and the flow rate. After calibration by this product and its method, the flow rate calibration work can rely on the relationship equation between the flow rate and the rotation speed and the relationship equation between the difference value and the flow rate to perform calibration by itself, realizing the implementation of calibration work using dual measurement criteria, and being applicable to implementation scenarios where external influences are extremely small and external influences cannot be ignored, making the measurement, control, calibration, etc. of the flow rate more accurate and flexible.

[0025] The product has the following advantages compared with existing flow meters: (A). By adopting an online calibration unit, etc., remote monitoring can be realized on the upper computer platform and the control terminal. Automatic online calibration without on-site personnel can be achieved, and errors caused by the accumulation of dirt in the pipe during long-term use and the installation position can be corrected at any time, ensuring that the uploaded data is always accurate. Of course, manual intervention can also be carried out for calibration, with a flexible operation mode, better meeting market needs.

[0026] (B). By adopting an online calibration unit, etc., the improvement of detection accuracy will inevitably improve the control accuracy. The higher the control accuracy, the more obvious the energy-saving effect.

[0027] (C). It is more convenient to realize personalized control of user-independent regulation and management and an operation plan of metering and charging according to demand. It expands the energy-saving ways of the heating system, mobilizes the energy-saving enthusiasm of users, and greatly saves thermal resources.

[0028] (D). Through the cooperation of an online calibration unit, a regulating valve, a pipe section, an integrating controller, etc., online calibration can be easily achieved on the upper computer platform and the control terminal. The operation is very simple, with extremely low professional requirements for relevant personnel, and it has good cost performance.

[0029] (E). Through an electromagnetic damper, unattended online calibration can be set to be carried out regularly or randomly, eliminating errors caused by the installation position and pipeline pollution, and achieving high-precision metering without maintenance and precise flow control. Due to the online calibration function, errors caused by installation, long-term operation, and the accumulation of dirt in the pipeline are removed; on-site maintenance is avoided; calibration in the factory is avoided; the metering accuracy of the product during the service life is guaranteed.

[0030] (F). Although this disclosure is described by taking water supply as an example, in fact, the media applicable to this disclosure can be other media in addition to water supply, and it is applicable to a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The following further details this disclosure with reference to the drawings.

[0032] Figure 1 is the main perspective sectional view of the flow meter of this disclosure - the arrow in the figure represents the water flow direction, indicating that the water flows from left to right, that is, from the pipe section to the regulating valve.

[0033] Figure 2 is the top view of the online calibration unit (electromagnetic damper, permanent magnet synchronous machine, magnetic pulse detector) of this disclosure.

[0034] Figure 3It is the schematic diagram of control and communication connection in the present disclosure, that is, the schematic diagram of the connection of the regulating valve, electromagnetic damper, magnetic pulse detector, return water temperature sensor, supply water temperature sensor and control and communication unit.

[0035] Figure 4 It is the flow chart of the usage method of the flow meter described in the present disclosure. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure belong to the scope of protection of the present disclosure.

[0037] Such as Figures 1 - 4 As shown, in order to facilitate the understanding of the above technical solutions of the present disclosure, the above technical solutions of the present disclosure will be described in detail below through specific usage methods.

[0038] An object of the present disclosure is to provide a flow meter capable of realizing an online calibration function, including a regulating valve 1, a pipe section 2 and an integrating controller 9. The regulating valve 1 and the pipe section 2 are connected in series, and the integrating controller 9 is respectively connected to the regulating valve 1 and the pipe section 2; An impeller 4 is provided in the pipe section 2. 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 and cooperating with the permanent magnet synchronizer 5 are provided outside 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; A control and communication unit 10 is provided in the integrating controller 9. The control and communication unit 10 is respectively connected to the regulating valve 1, the electromagnetic damper 3 and the magnetic pulse detector 6 through control wires; the control and communication unit 10 includes a data storage unit. The impeller 4 serves to measure the water flow rate, and the electromagnetic damper 3 serves to calibrate, and the electromagnetic damper 3 only functions during the implementation of calibration. The water flow flows from left to right, passing through the pipe section 2 and the regulating valve 1 in sequence.

[0039] In a possible embodiment, a return water temperature sensor 7 is provided in the pipe section 2. The control and communication unit 10 is connected to the return water temperature sensor 7 through a control wire.

[0040] In a possible embodiment, the return water temperature sensor 7 is located in the pipe section 2.

[0041] In a possible embodiment, the control and communication unit 10 is further connected to a supply water temperature sensor 8 through a control wire. The supply water temperature sensor 8 is installed at the supply end of the system.

[0042] In a possible embodiment, a display 11 is further provided on the integrating controller 9. The display 11 can be used to display calibration data or equations, such as displaying various flow values, the rotational speed of the impeller 4, the first relationship equation, the second relationship equation, and the current flow rate of the final calibration. Q` etc.

[0043] In a possible embodiment, the data storage unit includes a database for storage, query, and calculation.

[0044] In a possible embodiment, the integrating controller 9 is respectively connected to the regulating valve 1 and the pipe section 2 through two connecting posts 12. For example, the bottom or side of the integrating controller 9 can be respectively connected to the regulating valve 1 and the pipe section 2 through two connecting posts 12, which is specifically determined according to actual needs.

[0045] In a possible embodiment, the electromagnetic damper 3 and the magnetic pulse detector 6 are respectively arranged on both sides of the permanent magnet synchronous machine 5. During implementation, the installation positions and installation methods of the electromagnetic damper 3 and the magnetic pulse detector 6 can be determined according to actual needs, and they should be installed as close as possible to the outer sides of the pipe section 2 on both sides of the permanent magnet synchronous machine 5. Auxiliary structures such as mounting blocks 13 or connecting posts 12 can be provided on the pipe section 2 to install the electromagnetic damper 3 and the magnetic pulse detector 6, as long as it is ensured that the electromagnetic damper 3 and the magnetic pulse detector 6 are as close as possible to the permanent magnet synchronous machine 5 and are located on both sides of it.

[0046] In a possible embodiment, the permanent magnet synchronous machine 5 is preferably located in the pipe section 2.

[0047] In a possible embodiment, both the electromagnetic damper 3 and the magnetic pulse detector 6 are located outside the pipe section 2.

[0048] Another object of the present disclosure is to provide a method for using the flow meter provided by the previous object, including the following steps: S1 Factory initial calibration: Set the flow meter on the test equipment for calibration, calculate the first relationship equation representing the corresponding relationship between a specific impeller rotational speed and a specific flow rate, and store the obtained data and the first relationship equation into the control and communication unit 10 respectively; S1.1: Give n specific flow rates by adjusting the opening degree of the regulating valve 1, and respectively record the corresponding n specific rotational speeds ZSC of the impeller 4 (such as ZSC1......ZSCn) and the corresponding specific flow rate values Q of the flow meter (such as Q1.....Qn). Each of the specific flow rates is represented by the corresponding specific rotational speed ZSC of the impeller, and there is a one-to-one correspondence between the specific rotational speed ZSC of the impeller and the specific flow rate value Q; and n >= 2; Based on the specific rotational speed ZSC and specific flow rate value Q of each impeller, the first relationship equation between the two is calculated: Q = f1(ZSC); where Q represents the specific flow rate value corresponding to the specific impeller rotational speed, and ZSC represents the specific impeller rotational speed. S1.2: Start the electromagnetic damper 3. By adjusting the opening degree of the regulating valve 1, respectively give each of the specific flow rates in S1.1 (corresponding to each specific flow rate value Q) again, and respectively record n calibrated rotational speeds ZSB of each impeller (such as ZSB1......ZSBn) of the impeller 4 under the action of the electromagnetic damper 3, so that each calibrated rotational speed ZSB of the impeller forms a one-to-one correspondence with each specific rotational speed ZSC of the impeller (such as ZSC1......ZSCn). S1.3: Store both the first relationship equation and each calibrated rotational speed ZSB of the impeller into the data storage unit of the control communication unit 10; each calibrated rotational speed ZSB of the impeller and each specific rotational speed ZSC of the impeller respectively correspond one by one, and the two respectively represent the rotational speed of the impeller under the action of the electromagnetic damper 3 and the rotational speed of the impeller without the action of the electromagnetic damper 3. S2 Factory simulation on-site calibration: Start the electromagnetic damper 3, apply n different mechanical resistances to the impeller 4 respectively, measure the rotational speeds ZSZ of the damped impeller corresponding to each mechanical resistance respectively, compare the rotational speeds ZSZ of the damped impeller with the calibrated rotational speeds ZSB of the impeller in S1 and calculate the difference X, and calculate the second relationship equation between the difference X and the flow rate Q. S2.1: Start the electromagnetic damper 3; S2.2: First apply n different mechanical resistances to the impeller 4. For each mechanical resistance, by adjusting the opening degree of the regulating valve 1, respectively give each of the specific flow rates in S1.1 (corresponding to each specific flow rate value Q) again, and respectively record n rotational speeds ZSZ of the damped impeller (such as ZSZ1......ZSZn) under each mechanical resistance under the action of the electromagnetic damper 3. Thus, each rotational speed ZSZ of the damped impeller forms a one-to-one correspondence with each calibrated rotational speed ZSB of the impeller. S2.3: Compare each rotational speed ZSZ of the damped impeller and the calibrated rotational speed ZSB of the impeller - that is, compare the change value of the difference between ZSZ and ZSB after adding the mechanical resistance with the mechanical resistance. Through each corresponding rotational speed ZSZ of the damped impeller and the calibrated rotational speed ZSB of the impeller, calculate n differences X (such as X1....Xn); The expression formula for the difference is: X i =|ZSZ i -ZSB i |, 1 <= i <= n, that is, the absolute value after subtracting the corresponding rotational speed ZSZ of the damped impeller and the calibrated rotational speed ZSB of the impeller. S2.4: Turn off the electromagnetic damper 3. For each of the differences X (such as X1....Xn) representing different mechanical resistance effects, detect the corresponding rotational speed and flow rate value of the impeller 4 respectively, deduce the second relationship equation between the flow rate and the impeller rotational speed from the detection results, and store the second relationship equation in the data storage unit of the control communication unit 10; The second relationship equation between the flow rate and the impeller rotational speed is as follows: Q = f2(X); where X represents the difference and Q represents the flow rate value; S3 Implementation: Install the flow meter in the implementation environment for use. The flow meter enters the usage operation stage and waits to receive the online calibration command; S4 Monitor Calibration Command: The flow meter continuously monitors whether it receives the online calibration command; if so, enter S5; otherwise, continue to monitor; S5 Execute Online Calibration: When the online calibration command appears, respectively in the off and start states of the electromagnetic damper 3, by adjusting the opening of the regulating valve 1, read two groups of corresponding impeller rotational speed data, and perform calibration through the comparison results of the two groups of corresponding impeller rotational speed data; S5.1: When the online calibration command appears, through the opening of the regulating valve 1, make the impeller 4 reach each of the specific impeller rotational speeds ZSC (such as ZSC1......ZSCn) in S1.1; S5.2: Turn on the electromagnetic damper 3 and read the current impeller rotational speed corresponding to the influence of the n electromagnetic dampers 3 ZSZ` (such as ZSZ1 `... ZSZn `), and record the current flow rate corresponding to the current impeller rotational speed as ZSZ` `(such as Q `... Q1 `... Qn `); S5.3: Compare each corresponding impeller calibration rotational speed ZSB and the current impeller rotational speed ZSZ ` respectively; S5.4: According to the difference amplitude between each corresponding ZSB and ZSZ` `, select one from the first relationship equation and the second relationship equation to perform calibration confirmation on the corresponding current flow rate Q` ; S5.4.1: Calculate the corresponding current difference ZSZ ` between each corresponding ZSB and X `, X ` = | ZSZ ` - ZSB|; X ` represents the difference amplitude between the corresponding ZSB and ZSZ` `; S5.4.2: If the corresponding ( X ` / ZSB) <= M%, it means that there is no obvious difference between the corresponding ZSB and ZSZ `, and the influence of the electromagnetic damper 3 and mechanical resistance does not need to be considered. Only by substituting the specific rotation speed ZSC of each impeller into the first relational equation can the corresponding current flow rate be obtained Q` , so calculate according to the current flow rate Q` = f1(ZSC), that is, set the corresponding current flow rate Q` and perform calibration confirmation according to the first relational equation; and 0.01 <= M <= 20; Otherwise, it means that there is an obvious difference between the corresponding ZSB and ZSZ `, and the influence of the electromagnetic damper 3 and mechanical resistance needs to be considered. Then substitute the corresponding current difference X ` into the second relational equation, that is, calculate according to the current flow rate Q ` = f2( X `), that is, set the corresponding current flow rate Q` and perform calibration confirmation according to the second relational equation; S5.5: Take the current flow rate Q` calculated in S5.4 as the flow detection signal output value of the flow meter, and transmit it to the integrating controller 9 and the control communication unit 10. Thus, the online calibration work is completed; S6 Resume Execution and Monitoring: After the S5 online calibration work is completed, the flow meter resumes metering control operation, and should continue to monitor the next calibration command and return to S4.

[0049] In a possible embodiment, the value range of n is determined according to actual needs, and is preferably 2 - 30, representing the number of specific flow rates, specific impeller rotation speeds ZSC, impeller calibration rotation speeds ZSB, impeller rotation speeds with damping ZSZ, differences X, and current impeller rotation speeds ZSZ` .

[0050] In a possible embodiment, the value range of M is determined according to actual needs, and is preferably 1 - 5, representing the threshold at which the difference between the set impeller calibration rotation speed ZSB and the current impeller rotation speed ZSZ` reaches the level where the influence of the electromagnetic damper (3) or mechanical resistance needs to be considered, etc.

[0051] In a possible embodiment, the values of each of the mechanical resistances preferably form an increasing or decreasing sequence with regular changes, or a linear change relationship. Of course, it can also be implemented with reference to other existing technologies. The purpose of the mechanical resistance is to simulate the resistance, water flow impact force, external impact force, etc. caused by water scale, rust, impurities in the water flow, etc. For example, the mechanical resistance values are 1, 2, 3,... M, or 1, 3,... 3×M, where M is an integer, and the unit of the mechanical resistance is N.

[0052] In a possible embodiment, the faults that the flow meter undergoes can be impacts, equipment failures, etc., and can also be accidents such as power restoration after a power outage.

[0053] In a possible embodiment, the first relationship equation and the second relationship equation are specifically determined according to actual needs, and are preferably both linear relationship equations of one variable, which is more convenient for calculation. The first relationship equation actually represents the relationship between the impeller speed and the flow rate without considering the influencing factors such as mechanical resistance and the electromagnetic damper 3. The second relationship equation actually represents the relationship equation between the difference X between the rated impeller speed and the non-rated impeller speed and the flow rate Q.

[0054] Factory calibration stage (including S1, S2): Since the electromagnetic damper 3 has a certain influence on the speed of the impeller 4 when it is in the starting state, it is necessary to measure the rated impeller speed ZSB of the electromagnetic damper 3 in the starting state. Therefore, in S1, for the electromagnetic damper 3 in the closed and starting states, the same specific flow rates (corresponding to each specific flow rate value Q, where Q includes Q1....Qn) are respectively given, so as to obtain the specific impeller speed ZSC (such as ZSC1......ZSCn) of the impeller in the closed state of the electromagnetic damper 3 and the rated impeller speed ZSB (including ZSB1......ZSBn) of the impeller in the starting state of the electromagnetic damper 3. The first relationship equation is obtained through the specific flow rate value Q and the specific impeller speed ZSC, and is used for the calibration work when the influence of the electromagnetic damper 3 and mechanical force is negligible in subsequent implementations.

[0055] In the presence of mechanical force and when the electromagnetic damper 3 is started simultaneously, each of them will also affect the rotational speed of the impeller 4. Therefore, when the same specific flow rates (corresponding to specific flow rate values Q: Q1....Qn) are given, the rotational speeds ZSZ of the damped impellers (such as ZSC1......ZSCn) under the action of the electromagnetic damper 3 and each of the mechanical resistances are measured. The corresponding differences X (including X1...Xn) are calculated through the rotational speeds ZSZ of the damped impellers and the calibrated rotational speed ZSB of the impeller. By combining the difference X and the specific flow rate value Q, a second relational equation is obtained for the calibration work when the influences of the electromagnetic damper 3 and mechanical force cannot be ignored during subsequent implementation. In the present disclosure, the mechanical resistance applied in S2 simulates various influencing factors that may cause calibration errors in daily use, such as the resistance force, water flow impact force, and external impact force caused by scale, rust, and impurities in the water flow. The second relational equation considering the influences of the electromagnetic damper 3 and mechanical resistance is obtained through S2. Online calibration stage during implementation (S3, S4, S5): After the flow meter is put into implementation, after powering on the integrating controller 9 and the control communication unit 10, the flow meter continuously monitors in S4 waiting for an online calibration command. If an online calibration command is received, it enters the online calibration in S5, and after calibration, it returns to the monitoring in S4 through S6. S3 and S4 can not only serve as the initial calibration and calibration steps of the flow meter in the usage environment before officially starting the flow measurement work, but also serve as multiple online calibrations after repeatedly receiving the online calibration command, so as to better adapt to the changes during the operation of the flow meter and measure the flow more accurately. Data is obtained by the magnetic pulse detector 6 and the control communication unit 10 in the integrating controller 9, and the rotational speed of the impeller 4 and the water flow temperature parameters are measured. The relevant data of the water flow 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 such as the water flow rotational speed and flow rate. The control communication unit 10 sends the instantaneous parameters, cumulative parameters, valve opening, and operating status collected or calculated to the upper computer platform or the controller. The control communication unit 10 receives and executes the operation and calibration instructions issued by the upper computer platform or the controller, and uniformly coordinates and controls the cooperation of the regulating valve 1, the electromagnetic damper 3, the magnetic pulse detector 6, the return water temperature sensor 7, and the supply water temperature sensor 8. The regulating valve 1 can operate manually or automatically to adjust different control parameters. The rotational speed of the impeller 4 is used to measure the water flow rate, and the electromagnetic damper 3 is used to calibrate the accurate rotational speed data of each impeller 4 to assist in performing the calibration work.

[0056] In summary, through the above unique technical solution, the present disclosure has a simple structure and convenient operation. An on-line calibration unit is jointly constituted by an electromagnetic damper, a permanent magnet synchronous machine, and a magnetic pulse detector, and is further combined with a regulating valve, a pipe section, an integrating controller, and a water temperature sensor to continuously obtain accurate data to assist the calibration work. When leaving the factory, this product can summarize the relationship equation between flow rate and rotational speed by measuring rotational speed, flow rate data, etc., and can summarize and calculate the relationship equation between the difference value and the flow rate by the difference between the specific rotational speed of the simulated impeller and the rotational speed data of the impeller affected by mechanical force and other factors. It is also possible to respectively use the relationship equation between flow rate and rotational speed, and the relationship equation between the difference value affected by mechanical force and the flow rate. After calibration by this product and its method, the flow rate calibration work can rely on the relationship equation between flow rate and rotational speed, and the relationship equation between difference value and flow rate to perform calibration by itself, realizing the implementation of calibration work using a dual measurement standard, and being applicable to implementation scenarios where external influence is minimal and external influence cannot be ignored, making the measurement, control, calibration, etc. of the flow rate more accurate and flexible.

[0057] In the description of the present disclosure, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

Claims

1. A flow meter capable of realizing online calibration function, characterized in that: It comprises a regulating valve (1), a pipe section (2) and an integrating controller (9), wherein the regulating valve (1) and the pipe section (2) are connected in series with each other, and the integrating controller (9) is connected to the regulating valve (1) and the pipe section (2) respectively; An impeller (4) is provided in the pipe section (2), the upper end of the impeller (4) is connected to a permanent magnet synchronizer (5), an electromagnetic damper (3) and a magnetic pulse detector (6) corresponding to the permanent magnet synchronizer (5) are provided on the outer side of the pipe section (2), and the electromagnetic damper (3), the permanent magnet synchronizer (5) and the magnetic pulse detector (6) together constitute an online calibration unit; The integrating controller (9) is provided with a control communication unit (10), and the control communication unit (10) is respectively 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 according to claim 1, characterized in that: The pipe section (2) is provided 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.

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

4. The flow meter according to claim 1, characterized in that: 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.

5. The flow meter according to claim 1, characterized in that: The integrator controller (9) is also provided with a display (11); The data storage unit includes a database for storage, query and calculation.

6. The flow meter according to claim 1, characterized in that: The integrating controller (9) is connected to the regulating valve (1) and the pipe section (2) via two connecting columns (12) respectively.

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

8. The method for using the flow meter according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1 factory initial calibration: the flow meter is placed on a test device for calibration, a first relationship equation representing the corresponding relationship between a specific impeller speed and a specific flow rate is calculated, and the obtained data and the first relationship equation are respectively stored in the control communication unit (10); S1.1: n specific flow rates are given by adjusting the opening of the regulating valve (1), and the corresponding impeller specific speeds ZSC (such as ZSC1...ZSCn) of the n impellers (4) and the specific flow values ​​Q (such as Q1...Qn) corresponding to the flow table are recorded respectively, each of the specific flow rates is represented by the corresponding impeller specific speed ZSC, and the impeller specific speed ZSC and the specific flow value Q are in a one-to-one correspondence; and n>=2; By using the impeller specific speed ZSC and the specific flow value Q, a first relationship equation between the two is calculated: Q=f1(ZSC); wherein Q represents the specific flow value corresponding to the specific impeller speed, and ZSC represents the impeller specific speed; S1.2: starting the electromagnetic damper (3), adjusting the opening of the regulating valve (1) to give the specific flow rates (corresponding to the specific flow rate values ​​Q) in S1.1 again, and recording the n impeller calibrated speeds ZSB (such as ZSB1 ... ZSBn) of the impeller (4) under the action of the electromagnetic damper (3), so that each impeller calibrated speed ZSB forms a one-to-one correspondence with each impeller specific speed ZSC (such as ZSC1 ... ZSCn); S1.3: storing the first relational equation and each impeller calibrated speed ZSB in a data storage unit of the control communication unit (10); each impeller calibrated speed ZSB corresponds to each impeller specific speed ZSC, and the two represent the impeller speed under the action of the electromagnetic damper (3) and the impeller speed without the action of the electromagnetic damper (3), respectively; S2 factory simulation on-site calibration: start the electromagnetic damper (3), load n different mechanical resistances on the impeller (4), measure the corresponding 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, calculate the difference X, and calculate the second relationship equation between the difference X and the flow rate Q; S2.1: Start the electromagnetic damper (3); S2.2: the impeller (4) is first loaded with n different mechanical resistances. For each mechanical resistance, the specific flow rates (corresponding to each specific flow rate value Q) in S1.1 are respectively given again by adjusting the opening of the regulating valve (1), and n damped impeller speeds ZSZ (such as ZSZ1 ... ZSZn) under each mechanical resistance under the action of the electromagnetic damper (3) are respectively recorded, thereby forming a one-to-one correspondence between each damped impeller speed ZSZ and each impeller specific speed ZSB; S2.3: Compare the damped impeller speeds ZSZ and the impeller rated speeds ZSB, that is, compare the difference between ZSZ and ZSB after adding mechanical resistance as the mechanical resistance changes, and calculate n difference values ​​X (such as X1...Xn) through the corresponding damped impeller speeds ZSZ and impeller rated speeds ZSB; The expression of the difference is expressed as: i =|ZSZ i -ZSB i |, 1<=i<=n, that is, the absolute value of the corresponding damping impeller speed ZSZ and the impeller calibrated speed ZSB subtracted from each other; S2.4: the electromagnetic damper (3) is closed, and for each difference X (such as X1...Xn) representing different mechanical resistances, the rotation speed and flow rate value of the impeller (4) corresponding to each difference X are detected, a second relationship equation between the flow rate and the impeller rotation speed is derived from the detection results, and the second relationship equation is stored in the data storage unit of the control communication unit (10); The second relationship equation between the flow rate and the impeller speed is as follows: Q=f2(X); wherein X represents the difference, and Q represents the flow rate value; S3 is put into operation: the flow meter is installed in the implementation environment for use, and the flow meter enters the use operation stage and waits for receiving the online calibration command; S4 monitors the calibration command: the flow meter continuously monitors whether the online calibration command is received; if so, enters S5; otherwise, continues monitoring; S5 performs online calibration: when an online calibration command appears, the electromagnetic damper (3) is in a closed state or in a started state, the opening of the regulating valve (1) is adjusted, and two sets of corresponding impeller speed data are read respectively, and calibration is performed by comparing the two sets of corresponding impeller speed data; S5.1: When an online calibration command appears, the opening of the regulating valve (1) is adjusted so that the impeller (4) reaches the specific speed ZSC (such as ZSC1...ZSCn) of each impeller in S1.1; S5.2: Turn on the electromagnetic damper (3), and read the current impeller speed corresponding to the influence of n electromagnetic dampers (3) ZSZ` (like ZSZ1 `... ZGar `), current impeller speed ZSZ` The corresponding current flow is recorded as Q `(such as Q1 `... Q `); S5.3: The corresponding impeller calibrated speed ZSB and current impeller speed ZSZ `Compare separately; S5.4: According to the corresponding ZSB, ZSZ` The phase difference between them is selected from the first relationship equation and the second relationship equation to perform calibration confirmation on the corresponding current flow Q'; 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 difference between S5.4.2: If the corresponding ( X ` / ZSB)<=M%, represents the corresponding ZSB, ZSZ There is no obvious difference between them and there is no need to consider the influence of the electromagnetic damper (3) and mechanical resistance. The corresponding current flow rate Q can be obtained by substituting the specific speed ZSC of each impeller into the first relational equation. Therefore, according to the current flow rate Q` = f1(ZSC) is calculated, that is, the corresponding current flow is set Q` The calibration is performed according to the first relational equation; and 0.01<=M<=20; Otherwise, it indicates the corresponding ZSB, ZSZ There is a clear difference between them, and the influence of the electromagnetic damper (3) and mechanical resistance needs to be considered. Then the corresponding current difference X Substitute into the second relational equation, that is, according to the current flow Q `=f2( X `) operation, i.e. setting the corresponding current flow Q` to perform calibration confirmation according to the second relationship equation; S5.5: The current flow calculated in S5.4 Q` , as the flow detection signal output value of the flow meter, is transmitted to the integrator controller (9) and the control communication unit (10), thereby completing the online calibration work; S6 resumes execution and monitoring: After the online calibration work in S5 is completed, the flow meter resumes metering control operation, and should continue to monitor the next calibration command and return to S4.

9. The method of use according to claim 8, characterized in that: The value range of n is 2-30, representing the specific flow rate, the specific impeller speed ZSC, the calibrated impeller speed ZSB, the damped impeller speed ZSZ, the difference X, and the current impeller speed ZSZ` the number of The value range of M is 1--5, representing the set impeller calibration speed ZSB, the current impeller speed ZSZ` The phase difference amplitude reaches a threshold value at which the influence of the electromagnetic damper (3) or mechanical resistance needs to be considered.

10. The method of use according to claim 8, characterized in that: The values ​​of the mechanical resistances are in a regularly changing increasing series or decreasing series, or in a linear changing relationship.

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