Electromagnetic water meter circuit for flow velocity simulation

Abstract

The embodiment of the invention provides an electromagnetic water meter circuit for flow velocity simulation. The electromagnetic water meter circuit comprises an excitation line access end, at least two signal access ends and a flow velocity simulation resistor group, the excitation line access end is suitable for being electrically connected with an excitation end, and a first end of the excitation line access end is electrically connected with one end of the flow velocity simulation resistor group; the other ends of the at least two flow velocity simulation resistor groups are electrically connected with the second end of the excitation line access end; the excitation line access end is configured to generate excitation current under the power-on condition; and the flow velocity simulation resistor group is configured to perform flow velocity simulation voltage regulation according to the set position of the signal access end and the excitation current, determine a target flow velocity simulation voltage, and convert the target flow velocity simulation voltage into a flow digital signal to perform flow velocity simulation. The scheme can meet the requirements of multiple flow points and is applied to the electromagnetic water meter converter, so that the problems of inconvenience in operation and risk caused by intervention of a sensor and a pipeline required by converter verification are solved.

Description

Technical Field

[0001] The embodiments of the present specification relate to the field of circuit technology, and in particular to an electromagnetic water meter circuit for flow velocity simulation. Background Art

[0002] The working principle of electromagnetic water meter is based on Faraday's law of electromagnetic induction. The converter provides excitation current to the excitation coil to generate an alternating magnetic field. The conductive liquid flowing through the sensor cuts the magnetic lines of force to generate an induced electromotive force. The electromotive force is induced by the electrodes installed on the inner wall of the sensor. The magnitude of the electromotive force is proportional to the flow rate. The converter amplifies and processes the induced electromotive force signal, converts it into a flow value, and then displays it through the indicating device.

[0003] Based on the working principle of electromagnetic water meters, converters play an important role in the normal measurement of electromagnetic water meters. In electromagnetic meters used on site, converters may fail due to water ingress or environmental transportation, affecting the accuracy of water meter measurement. If the entire meter is replaced directly, the transportation cost will be directly generated, and some intangible costs will also be increased, such as labor costs for installation and commissioning, waste costs of old meter resources, and time costs of customers' water usage vacancies. The economically reasonable measure is to replace the converter. However, due to differences in electronic module welding, the electromotive force processed by the converter is a weak signal, and this difference must be identified and processed. Therefore, before leaving the factory, the electronic module of the converter must be uniformly calibrated. Conventional calibration operations often require it to be connected to the sensor and then placed on the water pipe.

[0004] However, since the electromagnetic water meter is a large intelligent meter, on the one hand, the weight of the sensor will increase the difficulty and convenience of carrying; on the other hand, if the pipe is not clamped properly, causing water splashing, it will also cause a certain short circuit risk on the converter circuit board. Secondly, if the connection harness between the converter and the sensor is not welded firmly, thus affecting the signal transmission, it is necessary to re-weld and check the water flow at the station, which increases the difficulty of operation and easily causes a waste of manpower and material resources. Therefore, a better solution is urgently needed. Summary of the invention

[0005] In view of this, the embodiments of this specification provide an electromagnetic water meter circuit for flow rate simulation to solve the technical defects existing in the prior art.

[0006] According to a first aspect of an embodiment of this specification, there is provided an electromagnetic water meter circuit for flow velocity simulation, comprising an excitation line access terminal, at least two signal access terminals and a flow velocity simulation resistor group;

[0007] The excitation line access end is suitable for being electrically connected to the excitation end, and the first end of the excitation line access end is electrically connected to one end of the flow velocity simulation resistor group; wherein the flow velocity simulation resistor group includes at least two flow velocity simulation resistors, each flow velocity simulation resistor is connected in series, and at least two signal access ends are arranged between any two flow velocity simulation resistors;

[0008] The other ends of at least two flow rate simulation resistor groups are electrically connected to the second end of the excitation line access end;

[0009] The excitation line access terminal is configured to generate an excitation current when powered on;

[0010] The flow rate simulation resistor group is configured to adjust the flow rate simulation voltage according to the position of the signal access terminal setting and the excitation current, determine the target flow rate simulation voltage, and convert the target flow rate simulation voltage into a flow digital signal to perform flow rate simulation.

[0011] In a possible implementation, a protection circuit is also included;

[0012] The protection circuit is connected in parallel with the flow rate simulation resistor group;

[0013] The protection circuit is configured to limit voltage and current to prevent short circuits.

[0014] In a possible implementation, the protection circuit includes a first protection resistor, a second protection resistor, and a third protection resistor;

[0015] One end of the first protection resistor is electrically connected to the first end of the excitation line access end;

[0016] The other end of the first protection resistor is electrically connected to one end of the second protection resistor;

[0017] The other end of the second protection resistor is electrically connected to one end of the third protection resistor;

[0018] The other end of the third protection resistor is electrically connected to the second end of the excitation line access terminal.

[0019] In a possible implementation, the flow rate simulation resistor group includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor;

[0020] The first resistor, the third resistor, the fifth resistor, the seventh resistor, the ninth resistor, the eleventh resistor, the thirteenth resistor, the fifteenth resistor, the sixteenth resistor, the fourteenth resistor, the twelfth resistor, the tenth resistor, the eighth resistor, the sixth resistor, the fourth resistor and the second resistor are sequentially connected in series;

[0021] One end of the first resistor is electrically connected to the first end of the excitation line access end;

[0022] One end of the second resistor is electrically connected to the second end of the excitation line access terminal.

[0023] In a possible implementation, the at least two signal access terminals include at least two flow rate simulation access terminal groups;

[0024] The flow rate simulation access terminal group includes two signal access terminals;

[0025] Each flow rate simulation access terminal group is used to simulate different flow rates.

[0026] In a possible implementation, the analog access terminal group includes a first analog access terminal group, a second analog access terminal group, a third analog access terminal group, and a fourth analog access terminal group;

[0027] The difference between the target voltage corresponding to the first analog access terminal group and the target voltage corresponding to the second analog access terminal group is a first difference;

[0028] The difference between the target voltage corresponding to the second analog access terminal group and the target voltage corresponding to the third analog access terminal group is a first difference;

[0029] A difference between a target voltage corresponding to the third analog access terminal group and a target voltage corresponding to the fourth analog access terminal group is a first difference.

[0030] In a possible implementation manner, the value of the first difference is 10.

[0031] In a possible implementation, the simulated flow velocity corresponding to the first simulated access terminal group is 10 m / s;

[0032] The simulated flow velocity corresponding to the second simulated access terminal group is 1m / s;

[0033] The simulated flow velocity corresponding to the third simulated access terminal group is 0.1 m / s;

[0034] The simulated flow velocity corresponding to the fourth simulated access terminal group is 0.01 m / s.

[0035] In a possible implementation, the device further includes a ground terminal;

[0036] The ground terminal is arranged between the fifteenth resistor and the sixteenth resistor.

[0037] In a possible implementation, it also includes a calibration signal access terminal;

[0038] The calibration signal access terminal includes a first calibration signal access terminal and a second calibration signal access terminal;

[0039] The first calibration signal access terminal is arranged between the first resistor and the third resistor;

[0040] The second calibration signal access terminal is arranged between the fourth resistor and the second resistor.

[0041] The embodiment of the present specification provides an electromagnetic water meter circuit for flow rate simulation, including an excitation line access terminal, at least two signal access terminals and a flow rate simulation resistor group; the excitation line access terminal is suitable for being electrically connected to the excitation terminal, and the first end of the excitation line access terminal is electrically connected to one end of the flow rate simulation resistor group; the other end of at least two flow rate simulation resistor groups is electrically connected to the second end of the excitation line access terminal; the excitation line access terminal is configured to generate an excitation current when powered on; the flow rate simulation resistor group is configured to adjust the flow rate simulation voltage according to the position of the signal access terminal and the excitation current, determine the target flow rate simulation voltage, and convert it into a flow digital signal based on the target flow rate simulation voltage to perform flow rate simulation. This solution can meet the needs of multiple flow points and is applied to electromagnetic water meter converters, thereby solving the inconvenience and risk problems caused by the intervention of sensors and pipelines required to verify the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a circuit diagram of an electromagnetic water meter circuit for flow velocity simulation provided by one embodiment of this specification;

[0043] Figure 2 This is a schematic diagram of an electromagnetic water meter circuit for flow rate simulation provided by an embodiment of this specification. DETAILED DESCRIPTION

[0044] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0045] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0046] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0047] In this specification, an electromagnetic water meter circuit for flow rate simulation is provided, which is described in detail in the following embodiments.

[0048] See also Figure 1 , Figure 1 A flow chart of an electromagnetic water meter circuit for flow velocity simulation provided according to an embodiment of the present specification is shown, which specifically includes an excitation line access terminal, at least two signal access terminals and a flow velocity simulation resistor group.

[0049] Specifically, the excitation line access terminal is suitable for being electrically connected to the excitation end, and the first end of the excitation line access terminal is electrically connected to one end of the flow rate simulation resistor group; wherein the flow rate simulation resistor group includes at least two flow rate simulation resistors, each flow rate simulation resistor is connected in series, and at least two signal access terminals are arranged between any two flow rate simulation resistors; the other end of at least two flow rate simulation resistor groups is electrically connected to the second end of the excitation line access terminal; the excitation line access terminal is configured to generate an excitation current when powered on; the flow rate simulation resistor group is configured to adjust the flow rate simulation voltage according to the position of the signal access terminal and the excitation current, determine the target flow rate simulation voltage, and convert the target flow rate simulation voltage into a flow digital signal to perform flow rate simulation.

[0050] The electromagnetic water meter circuit for flow rate simulation also includes a ground terminal, which is arranged between the fifteenth resistor and the sixteenth resistor. It also includes a calibration signal access terminal, which includes a first calibration signal access terminal and a second calibration signal access terminal, which is arranged between the first resistor and the third resistor, and the second calibration signal access terminal is arranged between the fourth resistor and the second resistor.

[0051] In practical applications, such as Figure 1 As shown in the circuit diagram: label EXC is the converter excitation line access terminal, labels G, PN, 10m, 1m, 0.1m, 0.01m are the converter signal line access terminals, R1-R16 are connected in series in the circuit, and the signal line is connected at different positions of the circuit to simulate different flow rates. Label G is the ground terminal, and label PN is the calibration signal access terminal.

[0052] In a possible implementation, a protection circuit is also included; the protection circuit is connected in parallel with the flow rate simulation resistor group; the protection circuit is configured to limit voltage and current to prevent short circuit.

[0053] In one possible implementation, the protection circuit includes a first protection resistor, a second protection resistor and a third protection resistor; one end of the first protection resistor is electrically connected to the first end of the excitation line access terminal; the other end of the first protection resistor is electrically connected to one end of the second protection resistor; the other end of the second protection resistor is electrically connected to one end of the third protection resistor; the other end of the third protection resistor is electrically connected to the second end of the excitation line access terminal.

[0054] Specifically, the resistor network composed of parallel resistors RP, RN and R17 serves to prevent the risk of short circuit caused by excessive current and voltage, making the circuit connection transmission more reliable and stable.

[0055] In one possible implementation, the flow rate simulation resistor group includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; the first resistor, the third resistor, the fifth resistor, the seventh resistor, the ninth resistor, the eleventh resistor, the thirteenth resistor, the fifteenth resistor, the sixteenth resistor, the fourteenth resistor, the twelfth resistor, the tenth resistor, the eighth resistor, the sixth resistor, the fourth resistor and the second resistor are connected in series in sequence; one end of the first resistor is electrically connected to the first end of the excitation line access end; one end of the second resistor is electrically connected to the second end of the excitation line access end.

[0056] Specifically, when the excitation end is connected to the tag EXC and powered on, an excitation current of about 25mA will be generated. If the signal line is connected to the tags G and PN, the current passes through the parallel resistors R1 and R2, and the circuit voltage V1 is equal to I×R1 (i.e., R3+R4+…+R16); if it is connected to the tag 10m, the current passes through R1-R6, and the circuit voltage V2 is equal to I×R2 (i.e., R7+…+R16); if it is connected to the tag 1m, the current passes through R1-R8, and the circuit voltage V3 is equal to I×R3 (i.e., R9+…+R16); if it is connected to the tag 0.1m, the current passes through R1-R10, and the circuit voltage V4 is equal to I×R4 (i.e., R11+…+R16); if it is connected to the tag 0.01m, the current passes through R1-R12, and the circuit voltage V5 is equal to I×R5 (i.e., R13+…+R16).

[0057] In a possible implementation, the at least two signal access terminals include at least two flow rate simulation access terminal groups; the flow rate simulation access terminal group includes two signal access terminals; and each flow rate simulation access terminal group is used to simulate different flow rates.

[0058] In a possible implementation, the analog access terminal group includes a first analog access terminal group, a second analog access terminal group, a third analog access terminal group, and a fourth analog access terminal group; the difference between the target voltage corresponding to the first analog access terminal group and the target voltage corresponding to the second analog access terminal group is a first difference; the difference between the target voltage corresponding to the second analog access terminal group and the target voltage corresponding to the third analog access terminal group is a first difference; the difference between the target voltage corresponding to the third analog access terminal group and the target voltage corresponding to the fourth analog access terminal group is a first difference. The value of the first difference is 10. The simulated flow velocity corresponding to the first analog access terminal group is 10m / s; the simulated flow velocity corresponding to the second analog access terminal group is 1m / s; the simulated flow velocity corresponding to the third analog access terminal group is 0.1m / s; and the simulated flow velocity corresponding to the fourth analog access terminal group is 0.01m / s.

[0059] For details, see Figure 2 The resistor superposition circuit is a circuit with resistors superimposed on the signal access end. When the current is fixed, the larger the resistance, the larger the voltage. Obviously, V1>V2>V3>V4>V5. The larger the voltage sensed by the converter, the larger the converted flow digital signal. In addition, the resistor voltage is regularly superimposed. Through the precise selection of the resistor value, V1 / V2=10, V2 / V3=10, V3 / V4=10, V4 / V5=10 can be made. Therefore, the flow velocity at the corresponding access position of the signal line is defined as 10m / s, 1m / s, 0.1m / s, 0.01m / s, which decreases by 10 times.

[0060] It should be noted that, under the premise of accurate selection of resistors, the signal line is connected to the tag 10m, and the simulated flow rate is 10m / s. If the converter coefficient has not been calibrated, the actual flow rate recognized and converted by the converter will deviate from the simulated standard flow rate (10m / s). Since the converter coefficient is positively correlated with the converted flow rate, the converter coefficient that needs to be calibrated can be calculated based on the simulated flow rate, the actual flow rate and the original converter coefficient. After calibration, the flow rate converted by the converter will be consistent with the simulated standard flow rate. Similarly, when other tags are connected, the simulated flow rate is inconsistent, and the calibration method is consistent.

[0061] When the signal end is grounded and 10m / 1m / 0.1m / 0.01m / PN respectively, and the excitation end is well connected, the circuit device operates normally, and the converter can identify the current and voltage and convert them to simulate the full pipe state; when any of the signal lines connected to the two ends of 10m / 1m / 0.1m / 0.01m / PN is disconnected, the empty pipe state can be simulated, thereby verifying whether the empty pipe detection function of the converter is normal.

[0062] The embodiment of this specification can add a flow rate simulation circuit to the electromagnetic water meter converter, divide the excitation current by resistance, so as to simulate flow signals of different sizes for flow rate conversion, which can meet the necessary conditions for converter function verification. Compared with traditional flow rate verification methods such as real flow verification and flow rate simulator verification, the operation is simpler, the risk is lower, and the flow rate selection is more diverse.

[0063] Furthermore, the circuit of this embodiment can be used in situations where the function of an electromagnetic water meter converter needs to be simulated and verified, and the circuit device of the present invention is connected to the excitation and signal terminals of the converter, generally by welding.

[0064] After ensuring that the circuit and the electromagnetic water meter converter are welded reliably, connect the electromagnetic water meter converter to the mainboard of the electromagnetic water meter display device. After power-on, the display device will automatically display information such as instantaneous flow and cumulative flow, and the empty pipe mark will disappear; the instantaneous flow will have a specific value, and the cumulative flow will be superimposed. The upper computer software and connection tooling can be used to verify whether the converter functions such as the monthly and daily cumulative flow storage function, the flow exceeding upper and lower limit alarm function, and the flow modification record function are normal.

[0065] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. An electromagnetic water meter circuit for flow velocity simulation, characterized in that: It includes an excitation line access terminal, at least two signal access terminals and a flow rate simulation resistor group; The excitation line access end is suitable for being electrically connected to the excitation end, and the first end of the excitation line access end is electrically connected to one end of the flow velocity simulation resistor group; wherein the flow velocity simulation resistor group comprises at least two flow velocity simulation resistors, each of the flow velocity simulation resistors is connected in series, and at least two signal access ends are arranged between any two of the flow velocity simulation resistors; The other ends of the at least two flow rate simulation resistor groups are electrically connected to the second end of the excitation line access end; The excitation line access terminal is configured to generate an excitation current when powered on; The flow rate simulation resistor group is configured to adjust the flow rate simulation voltage according to the position of the signal access terminal and the excitation current, determine the target flow rate simulation voltage, and convert it into a flow digital signal based on the target flow rate simulation voltage to perform flow rate simulation.

2. The method according to claim 1, characterized in that Also includes protection circuits; The protection circuit is connected in parallel with the flow rate simulation resistor group; The protection circuit is configured to limit voltage and current to prevent a short circuit.

3. The method according to claim 2, characterized in that The protection circuit includes a first protection resistor, a second protection resistor and a third protection resistor; One end of the first protection resistor is electrically connected to the first end of the excitation line access end; The other end of the first protection resistor is electrically connected to one end of the second protection resistor; The other end of the second protection resistor is electrically connected to one end of the third protection resistor; The other end of the third protection resistor is electrically connected to the second end of the excitation line access end.

4. The method according to claim 1, characterized in that: The flow rate simulation resistor group includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; The first resistor, the third resistor, the fifth resistor, the seventh resistor, the ninth resistor, the eleventh resistor, the thirteenth resistor, the fifteenth resistor, the sixteenth resistor, the fourteenth resistor, the twelfth resistor, the tenth resistor, the eighth resistor, the sixth resistor, the fourth resistor and the second resistor are sequentially connected in series; One end of the first resistor is electrically connected to the first end of the excitation line access end; One end of the second resistor is electrically connected to the second end of the excitation line access end.

5. The method according to claim 1, characterized in that The at least two signal access terminals include at least two flow rate simulation access terminal groups; The flow rate simulation access terminal group includes two signal access terminals; Each of the flow rate simulation access terminal groups is used to simulate different flow rates.

6. The method according to claim 5, characterized in that The analog access terminal group includes a first analog access terminal group, a second analog access terminal group, a third analog access terminal group and a fourth analog access terminal group; A difference between a target voltage corresponding to the first analog access terminal group and a target voltage corresponding to the second analog access terminal group is a first difference; A difference between a target voltage corresponding to the second analog access terminal group and a target voltage corresponding to the third analog access terminal group is a first difference; A difference between a target voltage corresponding to the third analog access terminal group and a target voltage corresponding to the fourth analog access terminal group is a first difference.

7. The method according to claim 6, characterized in that The value of the first difference is 10.

8. The method according to claim 6, characterized in that The simulated flow velocity corresponding to the first simulated access terminal group is 10m / s; The simulated flow velocity corresponding to the second simulated access terminal group is 1 m / s; The simulated flow velocity corresponding to the third simulated access terminal group is 0.1 m / s; The simulated flow velocity corresponding to the fourth simulated access terminal group is 0.01 m / s.

9. The method according to claim 4, characterized in that Also includes a ground terminal; The ground terminal is arranged between the fifteenth resistor and the sixteenth resistor.

10. The method according to claim 9, characterized in that Also includes a calibration signal access terminal; The calibration signal access terminal includes a first calibration signal access terminal and a second calibration signal access terminal; The first calibration signal access terminal is arranged between the first resistor and the third resistor; The second calibration signal access terminal is arranged between the fourth resistor and the second resistor.

Images