KR940000021B1 - Electronic flowmeter - Google Patents

Abstract

This system measures the flow of fluid with an impeller and transforms it to the electrical signal, thus enables to display the flow by digital type. The system comprises the converting means and the display circuit including a sensor (210), the 1st-3rd counters, a buffer, a dividing means, a logic control means (206), a 1st and 2nd display sections, a 1st and 2nd driving means (204,208), and a reset means, resetting the 3rd counter (207).

Description

Electronic flow meter

1 is a perspective view of the present invention.

2 is an exploded perspective view of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along the line BB of FIG. 2.

5 is a cross-sectional view taken along the line CC of FIG. 2.

6 is a bottom view of the cover.

7 is a cross-sectional view taken along the line D-D of FIG.

8 is a block diagram of a display unit.

9 is a detailed circuit diagram of FIG.

10 is a waveform diagram for explaining the operation of FIG.

* Explanation of symbols for main parts of the drawings

1: body 2: cover

3: sensor accommodating part 4: connection part

5: Display unit 10: Weighing room

20 impeller portion 30 impeller support member

40: first magnet 70: second magnet

80: lower support plate 90: rotation axis

100: support shaft 110: rotating plate

120: upper support plate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow meter, and more particularly, to an electronic flow meter configured to convert a flow of a fluid into a rotational movement and convert it into an electrical signal to display a flow rate digitally.

In general, a flow meter that measures the amount of fluid converts the flow of the fluid into a mechanical signal and displays the measured flow rate as an indicator. In order to mechanically convert the flow of the fluid, there is a need for an impeller in primary contact with the fluid, a cable connecting the impeller and the indicator, and a gear for transmitting the rotation of the cable to the indicator in the indicator.

The flowmeter having such a configuration cannot transmit the rotation of the impeller according to the flow of the fluid to the indicator due to its frictional force, and thus cannot accurately measure the flow rate.

Explaining another problem with a mechanical flowmeter,

1) The accuracy of flow measurement is halved due to the wear of gears used, and it increases the cost of the product because a separate receiver must be installed for remote measurement.

2) In addition, a separate counter should be installed on the flowmeter in order to accumulate flow for a certain period of time, but it is also difficult to expect accurate flow integration, and additional members and workmanship are added to provide satisfactory use effects. I can't get it.

Accordingly, an object of the present invention is to solve the above-mentioned problems of a flow meter adopting a mechanical method, and converts a fluid flow into a rotational motion and converts it into an electrical signal, thereby converting the flow rate according to a mechanical method such as frictional force. The present invention provides an electronic flowmeter with a function of integrating and resetting the flow rate as well as measuring accurate flow rate by removing obstacles of measurement.

A feature of the present invention is that the display part of the measured flow rate can be freely rotated with respect to the flow meter body, so that the flow measurement value can be easily recognized even in a narrow space. It is a comprehensive view of measurements in one place.

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

1 is a perspective view of the present invention, the present invention is almost similar to the configuration of a general flow meter.

That is, the present invention consists of a main body (1) formed of a flange (1A) in contact with the other end of the tube and the cover (2) that can be coupled to the upper body (1), the sensor accommodating portion on the upper cover (2) (3), the connection part 4, and the display part 5 are connected and comprised sequentially.

Referring to the detailed configuration of the present invention, Figure 2 is an exploded perspective view of the present invention, the metering chamber 10 accommodated in the main body 1, the impeller 20 accommodated in the metering chamber 10, the upper part of the metering chamber 10 To the metering chamber cover 30 seated and supporting the impeller portion 20, the first magnet 40 fixed to the upper end of the impeller 10, the packing 50 seated on the metering chamber cover 30, the main body 1 The fixed cover (2) and the separating support plate (60) fixed to the cover (2) are assembled in a stacked manner, and the second magnet (70), the lower support plate (80), and the rotating shaft (90) in the sensor accommodating part (3). ) And a pair of support shafts 100, a rotating plate 110, a sensor 130, and an upper support plate 120 are stacked.

The configuration and coupling relationship of each member as described above will be described with reference to FIGS. 2 and 3.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and a state in which each member of FIG. 2 is assembled is shown in cross section.

The upper open cylindrical measuring chamber 10 divided into the upper measuring chamber 11 and the lower flow chamber 12 is seated on the support 1B formed in the main body 1. The diameter of the lower weighing chamber 12 is configured to be smaller than the diameter of the upper weighing chamber 11, so that it is possible to mount on the support 1B through the boundary.

Although a plurality of holes 11A and 12B are formed on the front surfaces of the upper and lower measuring chambers 11 and 12, each of the holes 11A and 12A is inclined left and right.

FIG. 4 is a cross-sectional view taken along the line B-B of FIG. 2 and shows the degree of inclination of the plurality of holes 11A formed on the surface of the upper weighing chamber 11, and FIG. 5 is the line C-C of FIG. It is sectional drawing of the state cut | disconnected along this, and shows the inclination degree of the many hole 12A comprised in the lower weighing chamber 12 surface.

The reason why each of the holes 11A and 12A of the upper and lower weighing chambers 11 and 12 is inclined about 45 ° to the left and the right of the center of the weighing chamber 10 is introduced into the weighing chamber 10 through the holes 11A and 12A. This is for accurately contacting the fluid with the rotor blade 21 of the impeller 20 accommodated in the metering chamber 10. A shaft support 12B for supporting the lower end of the impeller 20, which will be described later, is formed at the center of the bottom of the lower weighing chamber 12.

The impeller portion 20 accommodated in the metering chamber 10 is divided into a shaft 22 and a rotor blade 21 at the center thereof, and a magnet fastening portion 23 is formed at the upper end of the shaft 22.

The impeller portion 20 accommodated in the metering chamber 10 has a lower end of the shaft 22 corresponding to the shaft support 12B at the bottom of the lower flow chamber 12, and the rotor blade 21 is positioned at the center of the metering chamber 10. In addition, the upper part of the shaft 22 is exposed to the exterior of the measurement chamber 10.

In the state where the impeller 20 is accommodated inside the metering chamber 10, the metering chamber cover 30 of the upper open type is seated on the metering chamber 10. The through-hole 31 is formed in the center of the bottom face of the measurement chamber cover 30 to penetrate the shaft 22 of the impeller 20.

The impeller portion 20 and the first portion are inserted into the shaft 22 of the impeller portion 20 penetrating the measurement chamber cover 30 by inserting the first magnet 40 into the magnet fastening portion 23 (composed of the screw portion) at the upper end thereof. The magnet 40 is integrated, inserts the first magnet 40 (the hole 41 is formed in the center) in the magnet fastening portion 23, and then attaches the magnet fixing nut 42 to the magnet fastening portion on the upper side of the impeller shaft 22. By screwing into 23, the first magnet 40 is fixed to the magnet fastening portion 23. Through this process, the impeller portion 20 is maintained vertical (relative to the main body 1) by the axial support 12B of the bottom of the metering chamber 10 and the through hole 31 of the metering chamber cover 30. .

The metering chamber 10, the impeller 20, the metering chamber cover 30, and the first magnet 40 as described above perform a role of converting the flow into the rotational motion by the flow of the fluid flowing in the main body 1. It consists of a rotation conversion unit (100A).

That is, the impeller 20 accommodated inside the metering chamber 10 while the fluid flowing into one end of the main body 1 flows in and out through the holes 11A and 11B of the upper and lower flow chambers 11 and 12. Rotating the rotor blades 21, so that the entire impeller 20 is rotated at the same time the first magnet 40 fixed to the magnet fastening portion 23 is also rotated.

On the other hand, the laminated metering chamber 10 and the metering chamber cover 30 is the upper surface of the main body 1 of the opening opening (1C) of the surface is made horizontal, in this state circular packing made of a material such as rubber (50) ) Is seated so as to simultaneously correspond to the upper surface of the measurement chamber cover 30 and the opening 1C edge of the main body 1.

Referring to the configuration and the mutual coupling relationship of the rotation sensing unit 100C for detecting the rotation of the rotation conversion unit 100A configured as described above and the cover unit 100B for supporting the rotation sensing unit 100C, the main body 1 The opening 2A of the lid 2 is formed, and the lid 2 fixed to the main body 1 by the high-information bolt 2D corresponding to the edge of the opening 1C of the lid 2 is open at the bottom center. 2A is comprised, and the female screw part 2B is formed in the lower edge of 2 A of opening part of the cover 2. As shown in FIG.

Before the cover 2 and the main body 1 are joined, the cover 2 is formed using a thin disc-shaped separating support plate 60 having a plurality of through holes 61 formed on the outer circumferential surface thereof using a high information bolt 63. It adheres to the lower edge of the opening part 2A, and seals the opening part 2A of the cover 2.

FIG. 6 is a bottom view of the lid 2. A female screw portion 2B capable of fixing the above-described separating support plate 60 to the open portion 2A edge with four high information bolts 63 is provided. The state formed in the penetrating state is shown.

FIG. 7 is a cross-sectional view taken along the line D-D in FIG. 2, showing the formation of the female screw portion 2B to which the opening portion 2A and the high support bolt 63 for fixing the separating support plate 60 are coupled. do. The female screw portion 2B penetrates the member, and the upper portion of the female screw portion 2B couples the lower end of each support shaft 100 to be described later, and the lower portion engages the high information bolt 63 described above. On the other hand, the screw hole 2C formed at the edge of the opening portion 2A is used when the sensor accommodating portion 3 and the lid 2 are coupled to each other, which will be described later.

In FIG. 7, an O-ring 2E is inserted in the lower edge of the opening 2 of the lid 2, so that when the lid 2 and the main body 1 are joined, each opening 1A, 2A is opened. Seal to prevent leakage of fluid.

On the other hand, the magnetic fastening portion 91 formed in the lower portion of the rotating shaft 90 is composed of a screw portion is inserted into the second magnet 70 in the state passing through the through hole 81 in the center of the lower support plate 80, the magnet By coupling the fixing nut 71 to the magnet fastening portion 91, the rotation shaft 90 and the second magnet 70 are integrated.

In addition, the insertion shaft 92 of the upper end of the rotating shaft 90 is inserted by an interference fit to the shaft receiving portion 111 protruding at a predetermined height in the center of the rotating plate 10, a portion of the upper end is exposed to the outside.

In this way, when the second magnet 70, the lower support plate 80, the rotating shaft 90, the rotating plate 110 is coupled to the lowermost second magnet 70 to correspond to the opening portion 2A of the cover 2 The second magnet 70 corresponds to the convex portion 62 of the surface center portion of the separation support plate 60 described above.

In this state, the pair of support shafts 100 pass through the pair of through-holes 82 (configured on the radial line) formed on the outer circumferential surface of the lower support plate 80 to cover the lower end portion 101 having the threaded portion. The female screw portion 2B formed at the upper edge of the open portion 2A of (2) is engaged. Accordingly, the lower support plate 80 and the rotation shaft 90 (the second magnet is fixed) are integrated into the cover 2 by the pair of support shafts 100.

Here, the pair of support shafts 100 have female threads 102 formed at the upper end thereof, and correspond to the upper support plate 120 having one-phase holes 122 formed on the diameter line of the outer circumferential surface.

A through hole 121 is formed in the center of the upper support plate 120, and the C-shaped sensor 130 is fixed to the lower part by the sensor fixing hole 123 and the sensor high information bolt 131 of the upper support plate 120. have.

The upper support plate 120 is mounted on the support shaft 100 in a state in which the upper support plate 120 corresponds to the pair of support shafts 100 through the pair of holes 122 on the outer circumferential surface. When screwed into the female threaded portion 102 of the upper pair of the support shaft 100, the upper support plate 120, the rotary plate 110, the rotary shaft 90 and the pair of support shaft 100, the lower support plate 80, The second magnet 70 is integrated with each other, and as a result, the above-described members, the lid 2, and the main body 1 are completed with each other.

On the other hand, as shown in Figure 3 the rotating shaft 90 is formed through the center portion of the upper support plate 120 and the lower support plate 80, the upper and lower ends are fixed by a pair of support shaft 100 Through the holes 121 and 81 and exposed to the outside, free rotation on the separating support plate 60 is possible.

As shown in FIGS. 2 and 3, a plurality of sensing holes 112 are formed on the outer circumferential surface of the rotating plate 110 at regular intervals from each other, and a c-shape is formed at the edge of the rotating plate 110. It can be seen that the sensor 130 is located in a state where it is fixed to the upper support plate 120.

A part of the outer circumferential surface of the rotating plate 110 is located between the upper and lower members of the tip of the c-shaped sensor 130, and thus the sensor 130 moves in the sensing hole 112 of the rotating plate 110 (rotational speed). Is sensed electrically and transmitted to the display circuit 55 embedded in the display unit 5 through the wire 130A in the connecting unit 4.

In this manner, the upper and lower support plates 120 and 80 and the support shaft 110 and the rotation shaft 110 are fixed to the cover 2 using the high information bolt 2D to open the cover 2 of the main body 1. (1C) adhere to margin.

At the upper end of the cover 2, the support shaft 100, the rotating plate 110 and the upper support plate 120, and the sensor accommodating part 3 for protecting the sensor 130 have a high information bolt 3A (the side of the cover 2). Display circuit 55, which is fixed to the screw hole 2C and receives the detection signal of the sensor 130 by the wire 130A in the connection portion 4 on the upper end of the sensor accommodating portion 3, and displays the signal. The display unit 5 including) is located.

The connection part 4 connecting the sensor accommodating part 3 and the display part 5 is a hollow flexible cord, and has a sensor 130 and a display part (130A) having a built-in conductive wire for transmitting a signal. The display circuit 55 built in 5) is connected.

When the function of the present invention is described in detail with reference to Figs. 2 and 3, the fluid introduced through the flange portion 1A of the main body 1 and the plurality of holes 11A and 12A formed in the metering chamber 10 is measured. It flows out to the opposite flange part 1A through (10).

As the fluid flows, the impeller portion 20 in contact with the fluid is rotated by the rotor blade 21, and the rotational force is the second magnet 40 at the magnet fastening portion 23 on the upper end of the shaft 22. Rotate

Rotation of the first magnet 40 rotates the first magnet 40 and the corresponding second magnet 70 in the same direction with the non-magnetic separating support plate 60 interposed therebetween.

The polarity of the first magnet 40 and the second magnet 70 is opposite to each other, the distance between the two magnets (40, 70) to maintain the minimum distance that the magnetic force can be transmitted.

Rotating plate 90 in which the insertion shaft 92 of the upper end of the rotation shaft 90 is pinched by the rotation shaft 90 to which the second magnet 70 is fixed and the shaft accommodating portion 111 according to the rotation of the second magnet 70 ( 110) also rotates.

At this time, since the lower portion of the rotating shaft 90 is penetrated into the central through hole 81 of the lower support plate 80 and the upper is through the central through hole 121 of the upper support plate 120, rotation in a no-load state is possible. (The lower surface of the second magnet 70 is in close contact with the separating support plate 60 to enable the support of the rotating shaft 90).

As the rotating plate 110 rotates, the plurality of sensing holes 112 formed on the outer circumferential surface of the rotating plate 110 sequentially pass through the central portion of the corresponding c-shaped sensor 130.

Ultimately, the flow rate according to the flow of the fluid is detected according to the number of movements (rotational speed) of each of the detection holes 112 according to the rotation of the rotating plate 110, wherein the electrical detection between the detection hole 112 and the sensor 130 The operating relationship will be described in detail with reference to FIGS. 8 and, more specifically, FIGS. 9 and 10.

8 is a block diagram of a display circuit 55 embedded in the display unit 5 shown in FIG. 1, wherein the sensor 210 for generating a pulse signal in accordance with the rotation of the rotating plate 110 includes a logic control means 206. As shown in FIG. And the first counting means 202, and the logic control means 206 is connected to the dispensing means 200 via the connection point P1, the first counting means 202 and the buffer means 201. The connection point P1 is connected to the first display unit 205 via the second counting means 203 and the first driving means 204, and the third counting means 207 and the second connected to the reset means 212. It is connected to the second display portion 209 via the driving means 208.

The dispensing means 200 is connected to the logic control means 206, and the sensor 210 is connected to an F / I converter 211 for converting a pulse signal into a current value.

The operation of the display unit configured as described above is as follows.

Whenever the detection hole 112 of the rotating plate 110 passes through the sensor 210, a pulse signal is generated one by one. For example, when there are 20 detection holes 112 of the rotating plate 110, the rotating plate 110 is One rotation generates 20 pulse signals.

The number of pulses generated by the sensor 210 is counted by the first counting means 202, and the counted output is supplied to the dispensing means 200 through the buffer means 201, for example, in 4-bit binary. do.

The dispensing means 200 divides an input signal at a predetermined period and supplies the divided signal to the logic control means 206. The logic control means 206 combines the output signal of the dispensing means 200 and the pulse signal from the sensor 210 to convert the synthesized signal into a first counting means 202, a second counting means 203 and a first counting means. Supply to the three counting means (207).

Therefore, each time the output signal of the logic control means 206 is defended, the first counting means 202 is reset, and the second counting means 203 and the third counting means 207 perform the logic. Each time the output signal (level) of the control means 206 changes, it is counted.

The output counted by the second counting means 203 is displayed numerically on the first display unit 205 through the first driving means 204, and the output counted by the third counting means 207 is firstly calculated. The second display unit 209 may be displayed as a number on the second display unit 209 to count the flow rate. The second display unit may be reset by the reset unit 212. For example, 209 may count and integrate the flow rate for one day or any time, and the first display unit 205 may continuously integrate the flow rate to be used.

Meanwhile, the pulse signal output from the sensor 210 may be converted into a current value by the F / I converter 211 and then supplied to a meta (not shown) operated by an analog signal to count the flow rate.

9 is a detailed circuit diagram of FIG. 8. Referring to the configuration of the sensor 210, the VCC power supply terminal is grounded through the diode D of the photocoupler PC and grounded via the resistor R3 and the transistor Q of the photocoupler PC. The collector terminal of the photocoupler PC is connected to the F / I converter 211 and to the first counter 221 via the connection point P2. Note that the sensor 210 refers to the “c” shaped sensor 130 of FIG. 2.

The connection point P2 is connected to one input terminal of the NOR gate G2, and the output terminal of the NOR gate G2 is connected to the first, second, third, fourth and sixth counters 221, 218, 215, 222 and 225. The first, second and third counters 221, 218 and 215 are respectively provided to the first, second and third dividers 219, 216 and 213 via the first, second and third buffers 220, 217 and 214, respectively. One output terminal of the first counter 221 is connected to the counter terminal K2 of the second counter 218, and one output terminal of the second counter 210 is connected to the counter terminal K3 of the third counter 215. do.

The first to third dividers 219 to 213 are connected to the VCC terminal via a resistor R1, and one input terminal is connected to another input terminal of the noah gate G1 connected to the output terminal of the noah gate G2. The output terminal of the noble gate G1 is connected to the remaining input terminals of the noble gate G2.

On the other hand, one output terminal of the fourth counter 222 to which the oscillation period setting capacitor C1 is connected is connected to the first display unit 205 via the first driving unit 224, and the other output terminal is the capacitor C2 for oscillation period setting capacitor. Is connected to the first display unit 205 via a fifth counter 223 and a second driving unit 227 connected to each other.

One output terminal of the sixth counter 225 to which the oscillation period setting capacitor C3 is connected is connected to the second display unit 209 via the third driving unit 227, and the other output terminal is connected to the oscillation period setting capacitor C4. The second display unit 209 is connected via the seventh counter 226 and the fourth driving unit 228.

In addition, the sixth and seventh counters 225 and 226 are grounded via the resistor R2 and connected to the VCC terminal through the pushbutton switch SW.

The operation of the display circuit configured as described above will be described in more detail with reference to FIG. 10.

As the sensing hole 112 of the rotating plate 110 rotates, the light of the diode D of the photocoupler PC of the sensor 210 is continuously and repeatedly blocked or opened. A pulse signal such as the SO waveform diagram of FIG.

The number of pulses generated in the photocoupler PC is counted by the first to third counters 221 to 215. When the first counter 221 counts the ninth of the input pulses and then the tenth pulse is input, When one pulse is input to the second counter 218 and the tenth pulse signal is input from the first counter 221 to the second counter 218 in the same manner, one pulse signal is input to the third counter 215. Is supplied. That is, the first counter 221 counts terminals, the second counter 218 counts 100 digits, and the third counter 215 counts 100 digits.

On the other hand, when the first to third dividers 219 to 213 are set to an arbitrary period, for example, the first to third dividers 219 to 213 are set to 111 cycles, and the first to third counters When 111 of the pulse signals 221 to 215 are counted, the potential at the point A transitions from the "low" level state to the "high" level at time t ₂ as shown in the A waveform diagram of FIG.

Therefore, the output terminal of Noah gate G1 transitions from the "high" level to the "low" level at time t ₂ as shown in the B waveform diagram of FIG. 11, so the output (point C) waveform of the noah gate G2 is the C waveform of FIG. As shown in the figure, the transition from the "low" level to the "high" level at time t2.

The 10 degree t ₂ When the time after the 112th pulse the t3 time input to the first counter 221, the potential of the point 9 ° A is shifted to the "low" level from the "high" level, the ninth degree B The potential of the point transitions from the "low" level to the "high" level, so the potential of point C in FIG. 9 transitions from the "high" level to the "low" level.

That is, the pulse signal generated when the potential of the point C transitions from the "low" level to the "high" level resets the first to third counters 221 to 215 and at the same time the fourth and sixth counters. 224 and 225 count this pulse signal.

Thus, for example, one pulse signal is input to the fourth and sixth counters 222 and 225 each time the first to third counters 221 to 215 count 111 pulse signals.

For example, the fourth counter 222 counts the number of input pulses up to one thousand units, and the fifth counter 223 counts up to ten million units, for example, and the fourth counter 222. The output of the first driver 224, the output of the fifth counter 223 is converted into an electrical signal capable of driving the seven segment (Sevenment) light emitting element in the second driver 227, respectively, It is supplied to the one display unit 205. In the first display unit 205, the seven segment light emitting device (not shown) is operated and a number is displayed according to the input signal.

The operations of the sixth and seventh counters 225 and 226, the third and fourth drivers 229 and 228 are the same as the operations of the fourth and fifth counters 222 and 223 and the first and second drivers 224 and 227. The description is omitted. However, when the pushbutton switch SW is turned on, the sixth and seventh counters 225 and 226 are reset, and the second display unit 209 returns to the "0" state, for example.

As a result, the second display unit 209 may be used for counting the flow rate of use for a day or a predetermined time, and the first display unit 205 may integrate the flow rate that is continuously used.

Since the operation of the F / I converter 211 has been described with reference to FIG. 8, the description thereof will be omitted.

The flow rate calculated through the above process is indicated as a number on the display panel 5A of the display unit 5.

Here, as a main part of the technical idea of the present invention, connecting the sensor accommodating part 3 and the display part 5 having the display circuit therein with the flexible connection part 4 facilitates the display part 5 even at an angle desired by the observer. To be able to observe.

That is, the flexible connecting portion 4, in which the conductive wire 130A (connected to the display circuit) extending from the sensor 130 is accommodated, is moved back and forth, left and right 360 without damaging the conductive wire 130A. It is possible to change the direction of the display unit 5 can be observed without being limited by the installation space, such as narrow space. In addition, by extending the connecting portion 4, the display portion can be observed at a place spaced from the place where the flowmeter is installed.

In the present invention as described above, the rotational force of the impeller according to the flow of fluid, rather than a mechanical method such as a gear, is transmitted to the rotating plate using a magnet, and the sensor detects the rotation of the rotating plate and processes this signal in the display circuit. Accurate flow measurement at no load is possible, flow rate integration function and reset function can be used to obtain flowmeters with various functions, and the present invention is also applicable to oil meters that accumulate oil usage. Of course, the principle of the can be applied.

Claims (9)

A flowmeter comprising means for converting a flow of a fluid into a rotational motion and a display circuit for calculating and displaying a flow rate by detecting rotation by the converting means, wherein the display circuit detects the rotation of the fluid flow and A sensor 210 for generating a pulse signal according to the present invention, first counting means 202 for counting the number of pulses connected and input from the sensor 210, and buffer means 201 from the first counting means 202. The dispensing means 200, which is connected via e.g. and divides the coefficient at predetermined intervals, and the output terminal are feedback-connected to the input terminal, and connected to the input signal from the sensor 210 and the dispensing means 200. Second and third counting means (203 and 207) for counting the number of pulses which are connected to the generated logic control means (206) and the logic control means (206) and the first counting means (201). And the second counting means 20 A first driving means 204 for converting a signal connected and input from 3) into an electrical signal for driving the first display portion 205, and a number according to the signal connected and input from the first driving means 204; The first display unit 205, which is displayed, the second driving means 208 connected to the third counting means 207 and converted into an electrical signal for driving the second display unit 209; A second display unit 209 in which a number is displayed according to a signal input from the second driving means 208 and a reset unit connected to the third counting means 207 to reset the third counting means 207. Electronic flow meter, characterized in that consisting of means (212). The electronic flow meter of claim 1, wherein the sensor is configured of a photocoupler PC. The method of claim 1, wherein the first counting means 202 is composed of first, second and third coefficients (221, 218, 215) for cascading, 10 digits, 100 digits, respectively, which are cascaded. The means 202 is cascaded, consisting of a fourth counter 222 for counting up to seven thousand digits and a fifth counter 223 for counting up to ten million digits 7, wherein the third counting means 207 is An electronic flow meter, comprising: a sixth counter 225 that counts up to one thousand units and a seventh counter 226 that counts up to ten million units. 4. The first, second and third buffers 220, 217 and 214 of claim 1 or 3, wherein the buffer means 201 is connected from the first, second and third counting means 221, 218 and 215, respectively. Electronic flowmeter, characterized in that consisting of. The method of claim 1 or 4, wherein the dispensing means 200 is composed of first, second and third dividers 219, 216 and 213 connected from the first, second and third buffers 220, 217 and 214, respectively. Electronic flowmeter 2. The logic control means according to claim 1, wherein the logic control means (206) is connected to a Noah Gate (G1) connected from the dispensing means (200) and the first counting means (202), and the Noah gate (G1) and a sensor (210). Electronic flow meter, comprising the gate G2. 4. The first and second driving means 204 and the second driving means 208, respectively, which are connected to the fourth and fifth counters 222 and 223, respectively. An electronic flow meter comprising a drive section (224 and 227) and third and fourth drive sections (229 and 228) connected from the sixth and seventh counters (225 and 226), respectively. The electronic flow meter according to claim 1, further comprising an F / I converter (211) for converting a signal connected and input from the sensor (210) into a current value. 2. The reset means 212 according to claim 1, wherein the reset means 212 is a pushbutton switch SW connected between the third counting means 207 and a VCC power supply terminal, and a resistor R2 connected between the third counting means 207 and ground. Electronic flow meter, characterized in that configured.