KR101573678B1 - Magnetic folwmeter of uniformity magnetic field distribution using digital filter - Google Patents

Magnetic folwmeter of uniformity magnetic field distribution using digital filter Download PDF

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Publication number
KR101573678B1
KR101573678B1 KR1020150117378A KR20150117378A KR101573678B1 KR 101573678 B1 KR101573678 B1 KR 101573678B1 KR 1020150117378 A KR1020150117378 A KR 1020150117378A KR 20150117378 A KR20150117378 A KR 20150117378A KR 101573678 B1 KR101573678 B1 KR 101573678B1
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KR
South Korea
Prior art keywords
unit
fluid
magnetic field
flow rate
detection signal
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KR1020150117378A
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Korean (ko)
Inventor
권진희
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(주)리테크
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/586—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/60—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/06—Indicating or recording devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
    • G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
    • G01F25/0007—

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The present invention relates to an electronic flowmeter. The flowmeter comprises: a detecting part (2) measuring a voltage change generated in accordance to fluid flow by being installed in a rear end of a bent pipe part (40); and a converting part (14) calculating fluid flux using a voltage value measured by the detecting part (2). Magnetic fields are uniformly distributed in the pipe by installing a plurality of electromagnets (8) in the detecting part (2) in order to measure a voltage detection signal, and the converting part measures the fluid flux by generating a uniform magnetic field detection signal using a plurality of voltage detection signals measured by the measuring part. As such, an error of the measurement value by a turbulent or windage, generated to the fluids is minimized even when an installation position of the electronic flowmeter (100) is placed on the rear end of the bent pipe part (40); thus precisely measuring the flux.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic flowmeter having a uniform magnetic field distribution using a digital filter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic flowmeter, and more particularly, to an electromagnetic flowmeter capable of precisely measuring a flow rate of a fluid even if a fluid flowing through a conduit passes through a bending portion to generate a drift or turbulence.

Generally, an electronic flow meter is known as a method for measuring the flow rate of sewage, and is a flow meter method using Faraday's law in which an electromotive force is generated in proportion to a flow rate when a conductive fluid passes through a magnetic field.

The signal detected by the electronic flow meter is generated directly proportional to the volume flow rate and has a wide measuring range. In the case of a conductive fluid, the flow rate can be measured regardless of temperature, pressure, density, viscosity, and conductivity have.

If a fluid passes through a magnetic field, a voltage difference occurs between the electrodes in a direction perpendicular to the coil, and the magnitude of the voltage is proportional to the flow velocity The flow rate can be measured.

Such an electronic flowmeter can measure the flow rate accurately when the conduit through which the fluid flows is in the form of a straight pipe or a fluid filled in the conduit. However, when the fluid flows through the bending portion and the vortex or vortex occurs, the flow rate can be accurately measured There is no problem.

Published Japanese Patent Application No. 10-2004-0025610, 'Electron flowmeter'

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic flowmeter capable of precisely measuring a flow rate even when a fluid flows through a bending section and a flow or vortex is generated.

According to an aspect of the present invention, there is provided an electromagnetic flowmeter including: a detection section (2) provided at a rear end of a bending section (40) for measuring a change in a voltage caused by a flow of a fluid; And a conversion unit 14 for calculating the flow rate of the fluid by using the voltage value obtained by the voltage detection unit 2. The detection unit 2 is connected to the conduit through which the fluid flows to allow the fluid to pass through the detection unit 2 A coupling part 6 for connecting the tubular body 4 to one end of the duct and a tubular body 4 through which the fluid flows and receiving excitation current from the conversion part 14, At least one electromagnet (8) for forming a coil shape including a thickness of the coil, a winding number of the coil, the number of the coils, and a coil winding direction to be different from each other, And flows through the body 4 A measurement unit 10 for measuring a voltage detection signal generated by the body, and an insulation member 10 formed of any one of polyurethane and Teflon to prevent a voltage generated by the flow of fluid from being short-circuited by the inner wall of the tubular body 4 (12), and the converting unit (14) comprises a control unit (16) for managing the converting unit (14) as a whole for measuring the flow rate of the fluid, A detection signal receiving unit 18 for receiving a plurality of detection signals obtained by measuring the voltage generated by the electromagnet 8 by the electromagnet 10 from the detection unit 2 and transmitting the detected signals to the control unit 16, An excitation current supply section 20 for generating a magnetic field in the tubular body 4 and an arithmetic section 22 for calculating the flow rate of the fluid by using the voltage detection signal measured by the measurement section 10, 22), the flow of the fluid A magnetic field signal compensating section 24 for generating an equal magnetic field detecting signal for correcting the error range of the measuring section 10 due to turbulence, A measurement information display unit 34 for externally displaying the flow rate information including the measured flow rate of the fluid, the accumulated flow rate, and the flow rate of the fluid, The abnormality of the electronic flow meter 100 including the function of the converter 14 and abnormality, the abnormality of the detector 2, the disconnection of the cable for transmitting and receiving the signal, the diagnostic display and correction of the setting error, A self-diagnosis unit 36 that calibrates itself together with the notification of the flow rate, a voltage detection signal measured by the measurement unit 10, flow rate information of the fluid calculated by the calculation unit 22, Changes in flow rate and flow rate Characterized in that the box consists of a detector (2) and the data storage unit 38 has a function to store the backup data to the OFF when the instantaneous power with the store data of the converter 14 to.

According to the present invention, when the mounting position of the electromagnetic flowmeter is installed at the rear end of the bending portion, the error of the measurement value due to the drift or turbulence generated in the fluid is minimized, and the flow rate can be precisely measured.

1 is a perspective view showing a configuration of an electromagnetic flowmeter according to an embodiment of the present invention,
2 is a view showing an installation position of an electronic flow meter according to an embodiment of the present invention,
FIG. 3 is a cross-sectional view showing a configuration of a detector of an electromagnetic flowmeter according to an embodiment of the present invention. FIG.
4 is a block diagram for explaining a configuration of a conversion section of an electromagnetic flowmeter according to an embodiment of the present invention,
5 is a block diagram showing a configuration of a magnetic field signal compensator according to an embodiment of the present invention,
6 is a view for explaining a generation pattern of a magnetic field according to an installation position of an electromagnet installed in a detection part of the present invention,
7 is a view showing a processing configuration of a magnetic field signal compensating unit according to an embodiment of the present invention.

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

FIG. 1 is a perspective view showing the configuration of the electromagnetic flow meter 100 of the present invention, and FIG. 2 is a view showing a state in which the electromagnetic flow meter 100 of FIG. 1 is installed.

The electromagnetic flow meter 100 of the present invention is installed at one end of a conduit through which a fluid flows, preferably at a rear end of a bending portion 40 where a drift or a turbulent flow is generated to measure a flow rate of a fluid flowing in the conduit.

An electromagnetic flow meter (100) of the present invention includes a detector (2) for measuring a change in voltage generated in accordance with a flow of a fluid, a converter (2) for calculating a flow rate of the fluid using the voltage value measured by the detector (14).

3, the detection unit 2 includes a tubular body 4 connected to a conduit through which the fluid flows and allowing the fluid to pass through the detection unit 2, a tubular body 4 installed at one end of the conduit, At least one electromagnet 8 for receiving a magnetizing current from the converting section 14 and forming a magnetic field in the tubular body 4 through which the fluid flows, A measuring unit 10 for measuring a voltage (electromotive force) generated by the flowing fluid passing through the tubular body 4 having the tubular body 4 formed thereon, And an insulating member (12).

In the present invention, at least one electromagnet (8) is provided inside the tubular body (4), and the flow rate of the fluid flowing in the conduit is measured by changing the shape of the magnetic field formed by each electromagnet (8).

In general, when the fluid is in the pipeline or the pipeline is straight, the measurement of the flow rate of the fluid can be kept constant according to the flow of the fluid in a constant form at all times. However, .

In the present invention, it is possible to accurately measure the flow rate of the fluid even if the flow rate is not accurately measured due to the occurrence of the drift or turbulence after the fluid passes through the bending portion (40).

To this end, in the present invention, electromagnets 8 for generating a magnetic field are disposed at a plurality of positions of the tubular body 4, and magnetic fields of different shapes are formed by the respective electromagnets 8 installed.

6, a magnetic field for forming different magnetic fields is installed in three directions inside the tubular body 4, and then the electromagnets 8 (see FIG. 6) are arranged so that the respective magnetic fields can be evenly distributed in the channel through which the fluid flows. ).

As an embodiment of the present invention, currents of different frequency bands can be supplied to the electromagnet 8 in order to facilitate frequency classification by the detection signal analysis unit 26, which will be described later.

At this time, the coils for forming the electromagnets 8 are wound in different shapes so that the magnetic fields formed by the electromagnets 8 are different from each other and distributed uniformly in the conduits so that the magnetic fields are formed in different directions .

The shape of the coil forming the electromagnet 8 may be various depending on the thickness of the coil, the number of turns, the number of strands, the winding direction of the coil, and the position of the magnetic field.

The mounting position and magnetic field shape of the electromagnet 8 shown in FIG. 6 is an embodiment, and a magnetic field can be formed by winding the coil in various forms in order to precisely measure the flow rate of the fluid, will be.

In the present invention, a voltage is generated in proportion to the flow velocity of a fluid passing through a magnetic field formed by a plurality of electromagnets (8) installed in the tubular body (4), and the generated voltage is measured by the measuring unit (14) to calculate the flow rate.

The insulating member 12 is installed along the inner surface of the tubular body 4 to prevent a voltage generated when the fluid passes through a magnetic field provided by the electromagnet 8 from being short-circuited through the tubular body 4. [

Generally, the conduit through which the fluid flows is a metal conduit. Since the conductivity of the conduit is larger than that of the fluid, the voltage generated when the fluid passes through the magnetic field is short-circuited to the conduit through the tubular body 4, do.

In the present invention, it is possible to prevent a voltage from being short-circuited through the tubular body (4) by isolating the fluid flowing through the channel except for the position where the measuring part (10) is installed out of the position where the fluid contacts the inside of the tubular body Make the flow measurement possible.

The insulating member 12 may be made of polyurethane, Teflon or the like, and any insulating material may be used.

In the present invention, a grounding ring (not shown) is provided on the upper portion of the insulating member 12, that is, at both ends of the tubular body 4 to remove a work signal such as a current contained in the fluid, It is also possible to increase the accuracy of the signal.

4, the conversion unit 14 of the present invention includes a control unit 16 that manages the conversion unit 14 as a whole to measure the flow rate of a fluid, a detection unit 16 that detects the voltage detection signal by the measurement unit 10, An excitation current supplying section 20 for supplying a exciting current to the electromagnet 8 of the detecting section 2 so that a magnetic field is formed in the tubular body 4; A magnetic field signal compensator (22) for correcting an error range of the measuring unit (10) due to fluid drift or turbulence during the calculation of the flow rate by the calculating unit (22) An operation signal input unit 32 for controlling the functioning of the conversion unit 14, a measurement information display unit 34 for externally displaying the measured flow rate information of the fluid, A self-diagnosis unit 36 for judging the abnormality in real time, And a data storage unit 38 for storing various data generated through the detection unit 2 and the conversion unit 14.

The control unit 16 manages data transmission / reception between the converting unit 14 and the detecting unit 2 and manages the flow rate of the fluid by using the measured detection signal.

As an embodiment of the present invention, the converting unit 14 may be integrated with the detecting unit 2, and the converting unit 14 and the detecting unit 2 may be separated from each other.

When the converting unit 14 and the detecting unit 2 are installed separately, a wireless communication unit (not shown) for connecting a wired cable based on RS-485 communication or Profibus-PA communication or for wireless communication for data transmission / .

The wireless communication unit may include a wireless signal transmission unit of the detection unit 2 and a wireless signal reception unit of the conversion unit 14 and may be Bluetooth or infrared communication. When the wireless communication unit is installed at a remote location, It is also possible.

The detection signal receiving unit 18 receives a plurality of detection signals obtained by measuring the voltage generated in the electromagnet 8 by the measuring unit 10 as the fluid flows in the tubular body 4 from the detecting unit 2, 16).

The excitation current supply unit 20 supplies a current to the electromagnet 8 so that a magnetic field is not formed in the electromagnet 8 when no current flows. When the excitation current is supplied by the excitation current supply unit 20, So that a voltage is generated by the flow of the fluid.

The calculation unit 22 calculates the flow velocity of the fluid using the voltage detection signal measured by the measurement unit 10, calculates the flow velocity and the diameter inside the tubular body 4, and finally calculates the flow rate of the fluid do.

In the present invention, at least one or more electromagnets 8 are installed on the tubular body 4 and calculated using the voltage detection signals measured by a plurality of magnetic fields at the time of calculating the flow rate by the calculation section 22 do.

The electromagnetic flowmeter 100 is installed at the rear end of the bending portion 40. The fluid that has passed through the bending portion 40 generates a drift and turbulence as well as bubbles, When the electromagnet 8 is installed only on one side, the fluid flow at a position where the magnetic field is insufficient can not be detected.

To this end, in the present invention, as shown in FIG. 6 (a), a plurality of electromagnets 8 are installed to form various magnetic fields, and a voltage generated as the fluid passes through a magnetic field is detected.

6 (b), the entire flow of the fluid flowing in the tubular body 4 can be measured in a sectional view, by compensating each magnetic field formed by the plurality of electromagnets 8 with one value as shown in FIG. 6 (b).

In the present invention, the magnetic field compensator 24 is configured to compensate a plurality of voltage detection signals measured through a magnetic field formed by a plurality of electromagnets 8 with one detection signal.

The magnetic field signal compensating unit 24 integrates the magnetic field formed by the electromagnets 8 and outputs the uniform magnetic field detection signal, which is an average value of the fluid flow in the tubular body 4, to a digital filter method (an adder, a multiplier, Shift register).

5, the magnetic field signal compensating unit 24 includes a detection signal analyzing unit 26 for classifying the voltage detection signal measured through the measuring unit 10 according to the magnetic field generated according to the shape of the electromagnet 8, After the voltage detection signal is classified by the detection signal analyzer 26, a period during which the signal value is constant among the respective detection signals, that is, a period in which the input signal value remains constant without changing the voltage as shown in FIG. 7 A detection signal extracting unit 28 for filtering the detected signal and a detection signal for each section extracted through the detection signal extracting unit 28 to generate a total detection signal in which a magnetic field is integrated to generate a detection signal inside the tubular body 4 And a uniform magnetic field signal generation unit 30 for generating a uniform magnetic field detection signal such that a magnetic field is uniformly distributed over the entire channel.

That is, the magnetic field signal compensation unit 24 of the present invention generates a uniform magnetic field detection signal by integrating the magnetic fields formed by dividing each of the compartments, thereby obtaining a correction value such that the magnetic field is uniformly distributed over the entire channel The flow rate of the fluid can be accurately measured.

4, the operation signal input unit 32 includes a conversion unit (not shown) such as a function setting of the conversion unit 14, for example, power ON / OFF, measurement information displayed through the measurement information display unit 34 14, and as a preferred embodiment, an operation signal can be input by pressing the screen in a touch manner.

The measurement information display unit 34 displays the flow rate information of the fluid measured by the calculation unit 22 externally. The flow rate information appearing on the measurement information display unit 34 includes the flow rate of the fluid, the flow rate of the fluid, .

The self-diagnosis unit 36 detects the device abnormality of the electromagnetic flow meter 100 and notifies the outside of the device or allows self-diagnosis to be performed by self diagnosis. Above, cable disconnection for signal transmission and reception, diagnosis display and calibration of setting error, and the function of detecting an open hole in a duct are included.

The data storage unit 38 stores the voltage detection signal measured by the detection unit 2, the flow rate information of the fluid calculated by the calculation unit 22, the flow rate of the fluid for calculating the flow rate information, And has a function of backing up and storing the data even when the power is turned off instantaneously.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of claims and equivalents thereof.

(2) -detection part (4) -tube body
(6) - fastening part (8) - electromagnet
(10) - Measuring section (12) - Insulating member
(14) -converting unit (16) -controller
(18) - detection signal receiving section (20) - excitation current supply section
(22) - operation unit (24) - magnetic field signal compensation unit
(26) -detecting signal analyzing section (28) -detecting signal extracting section
(30) -uniform magnetic field signal generation unit (32) -operation signal input unit
(34) - Measurement information display section (36) - Self diagnosis section
(38) - Data storage unit (40) - Tube part
(100) - Electronic flow meter

Claims (3)

In the electromagnetic flowmeter,
A detection unit 2 provided at the rear end of the bending portion 40 to measure a change in voltage generated in accordance with the flow of the fluid and a conversion unit for calculating a flow rate of the fluid using the voltage value measured by the detection unit 2, (14)
The detection unit 2 includes a tubular body 4 connected to a conduit through which the fluid flows so that fluid can pass through the detection unit 2 and a fastening unit for connecting the tubular body 4 to one end of the conduit The number of turns of the coil, the number of strands of the coil, and the winding direction of the coil so that different types of magnetic fields are formed in the tubular body 4 through which the fluid flows, At least one electromagnet 8 which forms a coil shape differently and a measuring section for measuring a voltage detection signal generated by the fluid flowing through the tubular body 4 having a magnetic field formed by the electromagnet 8 And an insulating member 12 formed of any one of polyurethane and Teflon in order to prevent a voltage generated by the flow of the fluid from being short-circuited by the inner wall of the tubular body 4,
The conversion unit 14 includes a control unit 16 that manages the conversion unit 14 as a whole to measure the flow rate of the fluid and a control unit 16 that controls the flow of the fluid in the electromagnet 8 by the measurement unit 10 in accordance with the flow in the tubular body 4. [ A detection signal receiving unit 18 for receiving a plurality of detection signals from the detection unit 2 and for transmitting the detection signals to the control unit 16 and an electromagnet 8 for supplying excitation current to the tubular body 4 (22) for calculating a flow rate of the fluid by using the voltage detection signal measured by the measuring unit (10), and an excitation current supplying unit (24) for generating a uniform magnetic field detection signal for correcting an error range of the measurement unit (10) due to the drift or turbulence of the fluid at the time of the measurement,
The magnetic field signal compensating unit 24 includes a detection signal analyzing unit 26 for classifying the voltage detection signal measured through the measuring unit 10 by a magnetic field generated according to a mode in which the electromagnet 8 is installed, A detection signal extracting unit 28 for filtering an interval in which the signal value is kept constant without changing the voltage among the respective detection signals after classifying the voltage detection signal for each magnetic field by the detection signal extracting unit 28, And generates a uniform magnetic field detection signal such that the magnetic field is evenly distributed over the entire channel inside the tubular body 4 through which the fluid flows. The uniform magnetic field detection signal is generated by integrating the magnetic field using the detection signal of each section, And a signal generator 30,
An operation signal input unit 32 for controlling the operation in a touch manner to set measurement information including ON / OFF of the conversion unit 14 and flow rate information of the measured fluid, A measurement information display section 34 for externally displaying flow rate information including the flow rate of the fluid, a diagnosis section for diagnosing and correcting a setting error, a cable disconnection for signal transmission and reception, A self-diagnosis unit 36 for determining in real time an abnormality of the electronic flow meter 100 including an open-tube detection function of the electronic flow meter 100 itself and calibrating itself together with notification to the outside, a voltage detection signal measured by the measurement unit 10, (2) including the flow rate information of the fluid calculated by the flow rate calculator (22), the flow rate of the fluid for calculating the flow rate information and the flow rate of the fluid, and the data of the transducer Back up data even when OFF And a data storage unit (38) having a function of storing data. The electromagnetic flowmeter of a uniform magnetic field distribution system using a digital filter.
delete The method according to claim 1,
Wherein the detecting unit (2) and the converting unit (14) constitute a wireless communication unit for wireless communication.
KR1020150117378A 2015-08-20 2015-08-20 Magnetic folwmeter of uniformity magnetic field distribution using digital filter KR101573678B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100832793B1 (en) * 2007-12-05 2008-05-27 (주)윈텍 Electromagnetic flow meter of capacitance sensors type
JP5565628B2 (en) * 2010-10-05 2014-08-06 横河電機株式会社 Electromagnetic flow meter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100832793B1 (en) * 2007-12-05 2008-05-27 (주)윈텍 Electromagnetic flow meter of capacitance sensors type
JP5565628B2 (en) * 2010-10-05 2014-08-06 横河電機株式会社 Electromagnetic flow meter

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