KR100844853B1 - Electronic water service meter and the control method - Google Patents

Abstract

The present invention relates to an electric water meter for measuring the flow rate by using a rotating impeller and a magnet that rotates in response to the rotation of the impeller by the conveyed fluid. More specifically, two reed switches are formed as sensors to output two sensors. The phase difference can be formed in 4 stages to accurately detect the forward and reverse rotations at any position, and the auxiliary magnets are spaced apart from each other around the center magnet rotating with the impeller to reduce the load due to the magnetization of the sensor. The present invention relates to an electronic water meter configured to measure a flow rate of a flow rate and a control method thereof.

The present invention includes a sensor driving magnet coupled to the impeller and the impeller shaft rotated by the flow of a fluid, and a reed switch that is spaced apart from each other to detect the rotation of the impeller by the sensor driving magnet. An electronic water meter that detects, integrates, and displays the fluid movement amount by a pulse, wherein an auxiliary magnet is formed to be spaced apart from the sensor driving magnet and opposed to opposite magnetic poles, spaced apart from the sensor driving magnet, and each reed switch output combination is The reed switch is formed to be spaced apart from each other so as to have a phase difference generated by the interrupt signal of the four stages, and by analyzing the interrupt signal of the four stages, the impeller can recognize the rotation direction accurately even if the rotation direction is changed at any position. It is done.

Water, Meters, Metering, Magnets, Reed Switches, Sensors.

Description

Electronic water service meter and the control method

1A is a schematic diagram illustrating an outline of the present invention.
1B is a conceptual diagram illustrating a reed switch installation position of the present invention.

Figure 2 is a plan view showing a water meter to which the present invention is applied.

3 is a cross-sectional view showing a water meter to which the present invention is applied.

Figure 4 is an exploded perspective view showing a water meter to which the present invention is applied.

5A and 5B are flowcharts illustrating a control method of the present invention.

6 is a time chart for explaining the control method of the present invention.

Figure 7 is a schematic diagram showing a magnetic field state for explaining the action of the auxiliary magnet and the impeller magnet of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

S1, S2: Reed switch N1, N2: Auxiliary magnet

10: sensor for driving the 100 100: controller

The present invention includes an impeller rotating by a conveyed fluid, a magnet rotating in response to the rotation of the impeller, and a reed switch that repeatedly turns on and off by a magnetic field of the magnet, and includes an electronic water meter that measures and displays the flow rate by accumulating the flow rate. More specifically, it relates to a meter, and more specifically, two reed switches are formed as a sensor, and phase difference between the two sensor outputs is formed in four stages so that the forward and reverse rotations can be accurately detected at any position, and the center magnet rotates together with the impeller. The present invention relates to an electronic water meter and a method of controlling the same, which are formed by spaced apart from each other by opposing magnets so as to reduce the load caused by the magnetization of the sensor and measure a flow rate of a minute flow rate.

In general, flow meters are known in various forms to measure the flow of a fluid.

Among them, in the case of a flow meter used as a water meter, in addition to simply measuring the amount of fluid flow, the flow rate is detected and displayed, and the usage fee for the detected flow rate is calculated and displayed.

Water meters are roughly divided into mechanical and electronic meters.

The mechanical water meter is designed to display the cumulative value as a scale or a numerical value through the gear group as the impeller rotates.With the problem of not knowing the weighing value for a certain period of time, the accuracy of weighing and remote meter reading is impossible, There are many problems such as wear or foreign matter stuck to the accurate metering and gradually replaced by electronic water meters.

Electronic water meters have several advantages over conventional mechanical water meters.

First of all, the reliability of meter reading is objectively high, and it is possible to calculate the usage of a certain type of usage calculation for a certain period of time, thus replacing the mechanical water meter.

As a well-known technique applied in advance, Utility Model Registration No. 364971 installs a permanent magnet on a wing of an impeller that rotates according to fluid flow in a body having an inlet and an outlet and a pair of reed switches on a cover plate to measure flow rate. It is made to prevent the rotation disturbance caused by the waste of fluid, and to detect the error due to the backflow phenomenon of the impeller.

However, according to this conventional technology, the impeller rotates by measuring two pulse signal inputs of the reed switch installed at a predetermined angle as one revolution, and calculates the time difference at the time of reverse rotation, and calculates the software (specifically the configuration). It is difficult to accurately identify the normal flow and the reverse flow when measuring with two consecutive pulse signals.

That is, if two pulses are input in a specific pattern, it is difficult to distinguish between normal flow and reverse flow, and when a small size magnet is formed to be mounted on the impeller blade, two reed switches are difficult to drive correctly when the impeller rotates quickly. There is.

Therefore, it is difficult to distinguish between steady flow and reverse flow at a specific position, and there is a problem of malfunction that does not correspond to rapid impeller rotation.

In addition, according to the conventional utility model registration No. 362743, a magnetic shield shield made of a high permeability metal tube and an external magnetic field access to an electronic water meter that transmits electronically measured measurement values remotely to prevent measurement disturbance by external magnetic force. Techniques for detecting and transmitting to an administrator are known.

The above-mentioned prior arts have common problems that are difficult to grasp the steady flow and the reverse flow accurately and continuously.

As a result, in the case of detecting the steady flow and the reverse flow by using the reed switch reacting with the rotating impeller, when three or more reed switches are formed, there is an advantage that the detection is easier, but it is a problem that many sensors must be formed in a narrow space. In addition, there is a limitation in that accurate pulse detection is difficult because the interval between the occurrence of interference between the sensors and the detection signal between the sensors is too narrow.

According to the related arts of an electronic water meter combining a rotating magnet and a sensor simultaneously, a plurality of sensors are formed and a sensor output is obtained by the action of a magnet interlocked with the sensor and the impeller so as to distinguish between the normal flow and the reverse flow to detect the passing flow rate. However, when the sensor is a reed switch and a sensor driving magnet is formed on the impeller's center rotation axis, when the two reed switches are to be spaced apart from each other within the magnetic field of the magnet, they are spatially narrow and there is a fear of malfunction due to simultaneous operation of the two reed switches. In order to exclude the simultaneous operation, if the distance from the magnet is a certain distance away from the magnetic field, there is a fear of a malfunction occurs, and if the magnetic field of the magnet is strong, the weight of the magnet is usually heavy, which provides side effects to the impeller rotation A contradiction arises that prevents accurate weighing.

Therefore, some of the prior art proposes to attach the magnet to the impeller blades so that the reed switch sensor and the magnet interlocking with the impeller must be spaced apart from each other on the same axis, but this is a malfunction when the impeller rotates at high speed. In addition, there is a problem that it is difficult to distinguish between the normal flow and the reverse flow because the magnet that crosses the normal flow and the reverse flow with the two sensors at a moment cannot realize the state of at least four levels according to the sensor output phase difference.

After all, if you want to acquire a phase difference signal of four phases, you need four stages of two sensors both on, two on one, and two off, but the two sensors intersect at once. You can see that it is impossible to acquire all of them.

The present invention will be described below to form a sensor driving magnet on the impeller central axis, while the reed switch as a sensor to accurately implement the state of the four stages even in a state of a predetermined distance from the impeller central axis to generate a sensor output having a phase difference In this regard, the technical idea of distinguishing the normal flow and the reverse flow to make the software process accurate and easy, and to exist within the magnetic field transmission range to solve the malfunction and inoperation.

The present invention has been made in view of solving the problems of the prior art as described above, and has the following object.

The present invention provides an electronic water meter and a control method thereof configured to detect a normal flow and a reverse flow separately.

The present invention is formed by having a phase difference to distinguish the two reed switch from each other and separated by a predetermined distance and angle from the impeller central axis magnet to the phase signal to identify the interrupt signal of the four stage positions, so that the normal and reverse flow is accurately detected and detected at any position The present invention provides an electronic water meter and a control method thereof capable of accurately measuring a backflow amount.

The present invention provides an electronic water meter and a control method thereof, which eliminates interference between sensors while accurately detecting a flow rate even at a high flow rate using a minimum number of two sensors.

The present invention increases the influence of the impeller magnet by forming an auxiliary magnet spaced apart from the reed switch sensor driving magnet provided on the impeller shaft to increase the influence of the magnetic force and the magnetism of the sensor while operating the impeller even at a minute flow rate. It is to provide an electronic water meter and a control method for forming an auxiliary magnet.

The present invention made to achieve the above object is a sensor driving magnet coupled to the impeller and the impeller shaft to rotate by the flow of the fluid, and the reed switch spaced apart from each other to sense the rotation of the impeller by the sensor driving magnet An electronic water meter comprising a sensor as a sensor for detecting, integrating, and displaying a fluid movement amount by a pulse of a sensor, wherein the auxiliary magnet is spaced apart from the sensor driving magnet to oppose opposite magnetic poles, and is spaced apart from the sensor driving magnet. The reed switch is formed to be spaced apart from each other so that each of the reed switch output combinations has a phase difference generated by the interrupt signal of the four stages. The interrupt signal of the four stages is analyzed to precisely change the rotation direction even when the impeller changes the rotation direction at any position. By being able to recognize.

Hereinafter, the technical configuration of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a, 1b is a schematic configuration diagram illustrating an overview of the present invention is a sensor driving magnet coupled to the impeller and the impeller shaft to rotate by the flow of the fluid, and the rotation of the impeller by the sensor driving magnet An electronic water meter having a control device for detecting and integrating and displaying a fluid movement amount by a pulse of a sensor having a sensor with a mutually spaced reed switch, wherein the sensor driving magnet 10 coupled to the impeller shaft has a central axis ( Z), the auxiliary magnets N1 and N2 are formed to be equidistantly opposed to one axis Y line, and the swallowing of the auxiliary magnets N1 and N2 is perpendicular to the axis X horizontally orthogonal to the axis Y. The reed switch (S1, S2) is installed in each of the up and down 45 degrees direction, the magnet 10 is driven by the impeller rotation to control the output of the reed switch (S1, S2) sequentially turned on and off (100) Input to microcomputer (MCU) of Is done.

Specific configurations of the magnet 10, the auxiliary magnets N1 and N2, and the reed switches S1 and S2 are illustrated in FIGS. 2 to 4.

A conventional water meter outer shell 11 having inlet and outlet ports, an impeller housing 12 inserted into the outer shell and supporting the impeller, an impeller 13 rotating in a flow flow, and a sensor driving magnet 10 on top of the impeller shaft The impeller is brought into contact with the cover 14 and hermetically engaged with the cover 15 of the casting material.

A lower PCB housing 16 mountable on the cover 15 and accommodating the PCB, and auxiliary magnets N1 and N2 for generating attraction and repulsion in relation to the magnet 10 on the housing; As described above, the lead switches S1 and S2 are spaced apart as a sensor, and the PCB 18 having the control device 100 is mounted and fixed to the water meter outer shell 11 as an upper cap 19. It is done in combination.

17 shows a metal member forming an external magnetic shield.

The control device 100 is a MCU, which is a one-chip microprocessor, receives inputs of the reed switches S1 and S2, calculates them according to the control method of the built-in control program, and displays the measured values on the outside of the water meter using the LCD module. It is equipped with an RF transmitter or RS-485 for transmitting the metered data.

The auxiliary magnets N1 and N2 are formed by combining different polarities facing each other when viewed in opposite states.

It looks at the control method of the present invention made as described above.

(S101) reading an input port of a sensor including a plurality of reed switches which are initialized according to the control method embedded in the MCU and generating a driving phase difference to detect the flow of water fluid (S101); Storing the current state (S102), detecting the occurrence of an interrupt to change the operation by reading the stored port state when the input port state is changed (S103), and storing the port at step S102 if the interrupt is generated When reading the storage port state reading step (S104) to read the state, when the input of the reed switch sensor is recognized as a changed state is detected, whether the sequential input signals of the plurality of sensors are input in the forward rotation state or in the reverse rotation state The modified input state detection step (S105a ~ S105d) to determine the forward and reverse rotation of the impeller by determining the, the forward rotation phase If it is determined that the normal state counter is increased, if it is determined that the reverse rotation state (S106, S107), the counter value storage step (S108, S109) for calculating and storing the normal flow or reverse flow as the counter value detected To counter the flow rate
Step (S110, S111) to detect the continuous flow for a predetermined time as a preset time, when the flow is detected in the normal flow calculation step, the alarm is determined to be an indoor leak and notified to the external transmission (S112), and in the reverse flow calculation step to an outdoor leak Determining alarm and notifying the external transmission (S113), if a certain time flow is not detected outputting the calculated flow rate and various information on the LCD (S114), and determining whether or not to execute the data transmission event (S115) In the RS-485 or RF transmitter is made to cyclically control as a data transmission step (S116) for transmitting the weighing data to the outside.

In the process of judging leakage as the normal flow and the reverse flow detection, a predetermined time is a time that can be preset by a user or an inspector. In the normal flow, if the maximum continuous use time is inputted in the normal flow, the maximum continuous use time is continuously exceeded. When a flow rate is detected, the alarm is alerted as an indoor leak signal, and the outdoor leak may be set in units of minutes.

On the other hand, when the stored port state is "0" state, if the port input state is "1" state, it is determined to be reverse flow, if the port input state is "2" state, it is determined as normal flow, and the stored port state is "1" state When the port input state is "3" state, it is determined to be reverse flow. If the port input state is "0" state, it is determined as normal flow. When the stored port state is "2" state, it is considered as reverse flow. If the port input state is "3" state, it is determined as normal flow. If the stored port state is "3" state, it is determined as reverse flow. If the port input state is "2" state, it is determined as reverse flow. It is made to judge the steady flow.

This is summarized in Table 1 below.

The state of the port is formed in four steps as shown in FIG.

That is, two sensors, the reed switch (S1, S2) repeats the on time and the off time by magnetic force. At this time, the MCU port reading the two sensor outputs has a state of "3" when both S1 and S2 are on time. S1 is on, S2 is recognized as "2" at off time, S1 and S2 are both at "0" at off time, and S1 is off at S1. To be recognized.

While the two sensor outputs have a constant phase angle, both output square waves overlap each other in an on or off state or are output opposite to each other, and the number of cases is consequently such that the reed switches are spaced apart from each other and have four phase differences. It is possible because of this.

Here, the normal or reverse flow direction is detected through the MCU input port, and if the continuous sensor signal is repeatedly input in the state of "3, 1, 0, 2", the counter is counted as normal flow, and the sensor signal is "3, 2, 0, 1". Repeatedly enters "to count backflow.

In addition, when the reed switches S1 and S2, which are sensors, and the magnet 10 are spaced apart by a predetermined distance, malfunctions between the sensors and between the magnets and the two sensors are prevented and at the same time, when the reed switch is switched on time, the auxiliary switch of the present invention is used. The operation is performed by the magnetic field of the magnets N1 and N2 and the magnetic field of the magnet 10 being amplified or attenuated by the sum and difference of the lines of magnetic force (see Fig. 7).

That is, when the magnetic pole of the magnet 10 and the magnetic pole of the auxiliary magnet (N1) is in the same magnetic pole state, the repulsive force of the magnet pushes the magnetic force lines to the outside, causing the driving on the reed switch of the corresponding position, and vice versa When the magnetic poles are different from each other, the magnetic force lines are concentrated between the magnetic poles facing each other, and the magnetic force to the outside is attenuated so that the reed switch at the corresponding position is kept off.

Therefore, the magnet 10 is provided at the center of the impeller shaft, and even if the reed switch is installed at a certain distance from the central axis, the magnetic force is transmitted reliably, so that the distance between the reed switches can be stably widened.

The present invention as described in detail above can be detected by distinguishing the normal flow and the reverse flow irrespective of whether the impeller stops and re-rotates at any position, the two reed switches are separated from each other and a certain distance from the impeller central axis magnet The phase difference is formed so that it can be distinguished by the interrupt signal of 4 stage positions separated by the angle of and. It can detect and detect the steady flow and the reverse flow accurately at any position, and can also measure the reverse flow rate accurately, and use the minimum number of two sensors Therefore, it detects the flow rate accurately even at high flow velocity and eliminates the interference between the sensors. Also, it forms an auxiliary magnet facing away from the reed switch sensor driving magnet provided on the impeller shaft to increase the influence of the impeller magnet, Caused by the magnetism of the sensor It is a very excellent invention having the effect of reducing the load and operating the impeller even at a fine flow rate.

Claims (6)

The sensor is provided with a sensor driving magnet coupled to the impeller and the impeller shaft rotating by the flow of the fluid, and reed switches spaced apart from each other by the sensor driving magnet to detect the rotation of the impeller. An electronic water meter having a control device that detects, integrates and displays a moving amount, The auxiliary magnets N1 and N2 are formed by facing the sensor driving magnet 10 coupled to the impeller shaft at an equidistant distance on one axis Y line with the central axis Z. The retardation of the auxiliary magnets (N1, N2) is formed by separating the reed switch (S1, S2) in the vertical direction 45 degrees in the axis (X) perpendicular to the axis (Y), respectively, Electronic water meter, characterized in that by connecting the output of the reed switch (S1, S2) that is sequentially on, off by driving the magnet 10 by the impeller rotation to the microcomputer (MCU) of the control device 100. The water meter according to claim 1, wherein the water meter is a conventional water meter outer shell 11 having an inlet and an outlet, an impeller housing 12 inserted into the outer shell and supporting the impeller, an impeller 13 rotating in a flow flow, and an upper end of the impeller shaft The sensor driving magnet 10 is coupled to the cover, and the impeller touches the cover 14 to be hermetically coupled to the casting cover 15. A lower PCB housing 16 mountable on the cover 15 and accommodating the PCB, and auxiliary magnets N1 and N2 generating attraction and repulsive force in relation to the magnet 10 on the housing, The water meter outer shell 11 as the upper cap 19 by mounting and fixing the PCB 18 having the control device 100 formed by combining the reed switch (S1, S2) as a sensor by separating from the magnet (10). Electronic water meter, characterized in that made in combination with The electronic water meter of claim 1, wherein the auxiliary magnets (N1, N2) are formed by combining different polarities facing each other when viewed in opposite states. In the control method of an electronic water meter that detects the flow rate of the water meter and divides the detected amount into a normal flow and a reverse flow, forming an integration counter and displaying and transmitting to the outside, Reading an input port of a sensor which is initialized and comprises a plurality of reed switches for generating a drive phase difference to detect the flow of the tap water (S101); Storing the current state of the read sensor input port (S102), Detecting the occurrence of an interrupt to change the operation by reading the stored port state when the input port state is changed (S103); When the interrupt is generated, the storage port state reading step (S104) of reading the port state stored in the step S102, When the input of the reed switch sensor is recognized as a changed state, it detects this and determines whether the sequential input signals of the plurality of sensors are input in the forward rotation state or the reverse rotation state, and thus the changed input for determining the forward and reverse rotation of the impeller. State detection steps S105a to S105d, If it is determined that the forward rotation state, the normal flow counter is increased, and if it is determined that the reverse rotation state, increasing the counter current counter (S106, S107), And a counter value storing step (S108, S109) of calculating and storing the normal flow or the reverse flow using the counter value. 5. The method of claim 4, further comprising: detecting continuous flow for a predetermined time as a preset time after the storing step of calculating and storing the steady flow or the reverse flow amount (S110, S111), When the flow is detected in the normal flow calculation step, the alarm to determine the indoor leak and notify the external transmission (S112), In the countercurrent operation step, the outdoor alarm is determined by the alarm and the external transmission notification (S113), If the flow is not detected for a certain time step of displaying the calculated flow rate and various information on the LCD (S114), The control of the electronic water meter further comprises a data transmission step (S116) of transmitting the weighing data to the outside through the RS-485 or RF transmitter in the step (S115) of determining whether to execute the data transmission event. Way. The method according to claim 4, wherein the step of storing the current state of the sensor input port state (S102) is a four-stage state by the combination of the output state of the sensor consisting of two reed switch, characterized in that the sensor output has a phase difference How to control an electronic water meter.

Images