KR101806306B1 - Apparatus for measuring flow velocity based on measurement for thickness of pipe - Google Patents

Apparatus for measuring flow velocity based on measurement for thickness of pipe Download PDF

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KR101806306B1
KR101806306B1 KR1020160019634A KR20160019634A KR101806306B1 KR 101806306 B1 KR101806306 B1 KR 101806306B1 KR 1020160019634 A KR1020160019634 A KR 1020160019634A KR 20160019634 A KR20160019634 A KR 20160019634A KR 101806306 B1 KR101806306 B1 KR 101806306B1
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South Korea
Prior art keywords
pipe
ultrasonic
wedge
ultrasonic transducer
wall
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KR1020160019634A
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Korean (ko)
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KR20170045700A (en
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김진오
김주완
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숭실대학교산학협력단
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
    • G01P5/241—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by using reflection of acoustical waves, i.e. Doppler-effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
    • G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters

Abstract

A flow velocity measuring apparatus according to an embodiment of the present invention includes a first wedge attached to an outer wall of a pipe, the first wedge having an upper surface including a horizontal portion horizontal to the outer wall of the pipe and an inclined portion inclined to the outer wall of the pipe; A second wedge opposed to the first wedge and spaced a predetermined distance in the direction in which the pipe extends, disposed on an outer wall of the pipe, the upper surface including an inclined portion; A first ultrasonic transducer disposed on a horizontal portion of the first wedge; Second and third ultrasonic transducers respectively disposed on the slopes of the first wedge and the second wedge; And the thickness of the pipe is measured on the basis of the time difference of the reflected wave reflected from the inner wall and the outer wall of the pipe by the ultrasonic signal outputted from the first ultrasonic transducer and the thickness of the ultrasonic wave outputted from the ultrasonic wave outputted from any one of the second and third ultrasonic transducers And a controller for measuring the speed of the fluid in the pipe based on the time required for the signal to be transmitted to the other end.

Figure 112016016628970-pat00002

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for measuring a flow velocity of a pipe,

The present invention relates to a flow velocity measuring apparatus based on measurement of the thickness of a pipe.

Generally, an ultrasonic wave velocity meter includes a transmitting transducer and a receiving transducer that transmit and receive an ultrasonic signal by using a state change of fluid flowing in a pipe, and transmits and receives an ultrasonic signal between the transmitting transducer and the receiving transducer a predetermined number of times, And the speed of the fluid is detected by measuring the propagation time according to the state change of the fluid while the transmission and reception of the fluid is repeated.

In particular, the pipe thickness is an important variable when calculating the flow rate. The current ultrasonic flowmeter is used to measure the speed of the fluid flowing in the pipe while knowing the specifications of the pipe, such as inputting the thickness or the inner diameter specified in the specification table of the pipe. Therefore, if you do not know the specification of the pipe, Another measuring instrument should be utilized to In addition, the thickness of the pipe may be measured or varied differently from the thickness at the time of production, and the problem may arise that the pipe is installed at a position that is difficult to directly measure. Therefore, if the thickness of the pipe can be checked from time to time and reflected in the flow rate measurement, the fluid velocity can be accurately measured over a long period of time.

In this regard, Korean Patent No. 10-1513697 (entitled: Ultrasonic Transducer Capable of Measuring Pipe Thickness and Flow Velocity Measurement Apparatus Using It) discloses a method of measuring the flow velocity of ultrasound waves generated from one piezoelectric disk, Discloses an ultrasonic transducer capable of measuring the thickness of a pipe for measuring the thickness of a pipe and a flow velocity measuring device using the ultrasonic transducer.

However, such a conventional flow velocity measuring apparatus has a disadvantage that it must pass through a plurality of interfaces for vertical incidence of ultrasonic waves for thickness measurement. Accordingly, there is a problem that the energy transfer rate is remarkably reduced by a plurality of ultrasonic wave transmission and reflection.

In order to solve the above-mentioned problems, the present invention provides ultrasonic transducers for measuring the thickness and flow velocity of a pipe through ultrasonic signals so that the shape of the wedge does not pass through a plurality of interfaces, It is an object of the present invention to provide a flow velocity measuring apparatus for measuring thickness and measuring a flow velocity in a pipe by minimizing loss.

It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may be present.

According to an aspect of the present invention, there is provided an apparatus for measuring a flow rate, the apparatus including: a pipe attached to an outer wall of the pipe, the pipe having a horizontal portion and a sloped portion inclined with respect to an outer wall of the pipe, A first wedge; A second wedge opposed to the first wedge and spaced a predetermined distance in the direction in which the pipe extends, disposed on an outer wall of the pipe, the upper surface including an inclined portion; A first ultrasonic transducer disposed on a horizontal portion of the first wedge; Second and third ultrasonic transducers respectively disposed on the slopes of the first wedge and the second wedge; And the thickness of the pipe is measured on the basis of the time difference of the reflected wave reflected from the inner wall and the outer wall of the pipe by the ultrasonic signal outputted from the first ultrasonic transducer and the thickness of the ultrasonic wave outputted from the ultrasonic wave outputted from any one of the second and third ultrasonic transducers And a controller for measuring the speed of the fluid in the pipe based on the time required for the signal to be transmitted to the other end.

The flow velocity measuring apparatus capable of measuring the thickness of the pipe according to an embodiment of the present invention minimizes the energy loss of the ultrasonic signal for thickness measurement and the ultrasonic signal for flow velocity measurement and can accurately measure the thickness and flow velocity of the pipe.

1 is a block diagram showing a configuration of a flow velocity measuring apparatus according to an embodiment of the present invention.
2 is a view for explaining a method of measuring a thickness and a flow velocity of a pipe according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a comparison of received ultrasound signals with an ultrasound transducer according to the presence or absence of a buffer layer in order to illustrate that the buffer layer according to an embodiment of the present invention improves resolution.
4 is a view for explaining an elastic wave reflected in a first wedge according to an embodiment of the present invention.
5A to 5C are views for explaining a method of leaving only a signal including thickness information among ultrasound signals received by the flow velocity measuring apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "including" an element, it is to be understood that the element may include other elements as well as other elements, And does not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

1 is a block diagram showing a configuration of a flow velocity measuring apparatus according to an embodiment of the present invention.

1, the flow velocity measuring apparatus 1 of the present invention includes a first ultrasonic transducer 110, a second ultrasonic transducer 120, a third ultrasonic transducer 210, and a controller 300 .

The control unit 300 of the flow velocity measuring apparatus 1 of the present invention measures the thickness of the pipe based on the time difference of the reflected wave reflected from the inner wall and the outer wall of the pipe by the ultrasonic signal outputted from the first ultrasonic transducer 110 And the speed of the fluid in the pipe is measured based on the time required for the ultrasonic signal output from the second ultrasonic transducer 120 to be transmitted to the third ultrasonic transducer 210.

The flow velocity measuring apparatus 1 according to the present invention includes an ultrasonic wave measuring unit 120 for measuring an ultrasonic wave signal for measuring a thickness of a pipe and an ultrasonic wave signal for measuring an internal velocity of the pipe by means of a first ultrasonic transducer 110 and a second ultrasonic transducer 120, The ultrasonic energy loss for thickness measurement and flow rate measurement can be minimized.

In addition, the flow velocity measuring device 1 of the present invention is configured such that the shape of the first wedge is formed so as not to pass through a plurality of interfaces for measurement of the thickness of the pipe. By the ultrasonic wave transmission and reflection occurring in the conventional ultrasonic transducer, It is possible to solve the problem that the transmission rate is remarkably reduced.

In addition, the flow velocity measuring apparatus 1 of the present invention improves resolution of an ultrasonic signal for measuring the thickness of a pipe through a buffer layer provided on the upper portion of the first ultrasonic transducer 110, thereby accurately measuring the thickness of the pipe Thereby improving the accuracy of the flow rate measurement.

FIG. 2 is a view for explaining a method of measuring the thickness and flow velocity of a pipe according to an embodiment of the present invention. FIG. 3 is a graph showing the relationship between the presence or absence of the buffer layer And the ultrasonic transducer according to the second embodiment of the present invention.

1 and 2, the flow velocity measuring apparatus 1 includes a first wedge 100, a second wedge 200, and a control unit 300.

2, the first wedge 100 is attached to the outer wall of the pipe 10, and the upper surface of the first wedge 100 is inclined relative to the outer wall of the pipe 10 and the horizontal portion 101, And includes a photographic inclined portion 102. Here, the horizontal portion 101 and the inclined portion 102 of the first wedge 100 are connected.

The first wedge 100 includes a first ultrasonic transducer 110, a second ultrasonic transducer 120, and a buffer layer 130.

The first ultrasonic transducer 110 is disposed on the horizontal portion 101 of the first wedge 100 and the second ultrasonic transducer 120 is disposed on the inclined portion 102 of the first wedge 100 do. At this time, the first and second ultrasonic transducers 110 and 120 may be piezoelectric disks, but are not limited thereto.

As shown in FIG. 2, the first ultrasonic transducer 110 may output an ultrasonic signal. Then, the first ultrasonic transducer 110 can receive the reflected wave reflected from the outer wall and the inner wall of the pipe 10. The first ultrasonic transducer 110 may be attached to the horizontal portion 101 of the first wedge 100 and used only as an ultrasonic signal for measuring the thickness of the pipe 10. The ultrasonic signal outputted from the first ultrasonic transducer 110 attached to the horizontal portion 101 which is horizontal to the outer wall of the pipe 10 is directly transmitted to the outer wall and the inner wall of the pipe 10, The transmittance of the ultrasonic signal can be improved.

The ultrasound signals output from the first ultrasonic transducer 110 attached to the horizontal portion 101 of the first wedge 100 are vertically incident on the pipe 10 and are transmitted through the outer wall of the pipe 10 1 wedge < RTI ID = 0.0 > 100 < / RTI > The output ultrasound signal may then be reflected vertically through the outer wall of the pipe 10 and then toward the upper surface of the first wedge 100 at the inner wall of the pipe 10. [

The second ultrasonic transducer 120 may output an ultrasonic signal and may receive the ultrasonic signal output from the third ultrasonic transducer 210. The second ultrasonic transducer 120 is attached to the inclined portion 102 of the first wedge 100 and can be used only as an ultrasonic signal for measuring the flow velocity of the pipe 10. [ Therefore, the second ultrasonic transducer 120 can transmit or receive ultrasonic signals for measuring the flow velocity of the pipe 10. [

The buffer layer 130 may be disposed on the first ultrasonic transducer 110 attached to the upper surface of the first wedge 100, and a detailed description thereof will be given later with reference to FIG.

The second wedge 200 faces the first wedge 100 and is disposed on the outer wall of the pipe 10 by a predetermined distance in the direction in which the pipe 10 extends, As shown in FIG. The second wedge 200 is disposed on the outer wall of the pipe 10 opposite to the first wedge 100 and the ultrasonic waves emitted from the second ultrasonic transducer 120 are transmitted through a propagation path The inclined portions 102 and 202 are disposed so as to face each other so as to be incident on the third ultrasonic transducer 130.

The second wedge 200 includes a third ultrasonic transducer 210.

The third ultrasonic transducer 210 is disposed on the inclined portion 202 of the second wedge 200. At this time, the third ultrasonic transducer 210 may be a piezoelectric plate, but is not limited thereto.

As shown in FIG. 2, the third ultrasonic transducer 210 may receive the ultrasonic signal output from the second ultrasonic transducer 120. The third ultrasonic transducer 210 may output an ultrasonic signal. The third ultrasonic transducer 210 may be attached to the inclined portion 202 of the second wedge 200 and used only as an ultrasonic signal for measuring the flow velocity of the pipe 10. Therefore, the third ultrasonic transducer 210 can transmit or receive ultrasonic signals for measuring the flow velocity of the pipe 10. [

2, the ultrasonic signal output from the second ultrasonic transducer 120 attached to the inclined portion 102 of the first wedge 100 is reflected by a propagation path considering the refraction of the ultrasonic wave A third ultrasonic transducer attached to the inclined portion 202 of the second wedge 200 facing the inclined portion 102 of the first wedge 100 after passing the pipe 10 through the forward diagonal of the flow, May be received by the ducer 210.

The ultrasonic signal output from the third ultrasonic transducer 210 attached to the inclined portion 202 of the second wedge 200 is transmitted to the pipe 10 along the propagation path in consideration of the refraction of the ultrasonic wave, And then transmitted to the second ultrasonic transducer 120 attached to the inclined portion 102 of the first wedge 100 facing the inclined portion 202 of the second wedge 200.

Hereinafter, with reference to FIG. 3, the buffer layer 130 will be described in detail.

The buffer layer 130 is disposed on the first ultrasonic transducer 110 attached to the upper surface of the first wedge 100. The buffer layer 130 is made of epoxy and tungsten, and the ratio of tungsten may be higher than that of epoxy. At this time, since the acoustic impedance of the tungsten is large, it can be matched with the impedance of the ultrasonic transducer. In addition, in the case of epoxy, sound absorption sound is good, so that it is possible to effectively remove the acoustic wave echoes from the rear surface opposite to the direction of propagation of the ultrasonic signal. Also, since the buffer layer 130 is brought into intimate contact with the ultrasonic transducer by tungsten, which is well-compactioned during manufacture, the reverberation reduction of the ultrasonic transducer can be increased.

3, the ultrasonic signal a received by the ultrasonic transducer and the ultrasonic wave signal b received by the ultrasonic transducer when the buffer layer 130 is present are compared with each other in the absence of the buffer layer 130 . The ultrasound signal for thickness measurement is received at 17.5 μs by the first ultrasonic transducer 110. When the buffer layer 130 is not present and the buffer layer 130 is present, Time seems to be short.

Therefore, since the buffer layer 130 can shorten the duration of the ultrasonic signal transmitted / received by the first ultrasonic transducer 110, the resolution can be improved. That is, the resolution of the ultrasonic signal for thickness measurement of the pipe 10 output from the first ultrasonic transducer 110 can be improved, and the thickness of the pipe 10 can be more accurately calculated.

The control unit 300 measures the thickness of the pipe 10 based on the time difference between the reflected waves reflected from the inner wall and the outer wall of the pipe 10 by the ultrasonic signal output from the first ultrasonic transducer 110. The controller 300 controls the thickness of the pipe 10 based on the period of the reflected wave reflected from the outer wall and the inner wall of the pipe 10 by the ultrasonic signal output from the first ultrasonic transducer 110. [ Can be measured.

The controller 300 controls the first ultrasonic transducer 110 and the second ultrasonic transducer 110 so that the ultrasonic signal output from the first ultrasonic transducer 110 is reflected from the outer wall of the pipe 10 toward the upper surface thereof, Based on the difference of the second time required for the ultrasonic signal output from the first ultrasonic transducer 110 to be reflected toward the upper surface from the inner wall of the pipe 10 and transferred to the first ultrasonic transducer 110, 10).

For example, the control unit 140 can calculate the thickness of the pipe 10 by multiplying the difference between the first time and the second time by 1/2, and multiplying the difference by the velocity of the ultrasonic signal. As another example, the thickness of the pipe 10 can be calculated by the resonance method. When an ultrasonic signal is incident on the pipe 10, since the resonance occurs when it is an integral multiple of the half-wave length, the thickness of the pipe 10 can be calculated by measuring the frequency.

The controller 300 may be configured to transmit the ultrasound signals output from the second ultrasound transducer 120 to the third ultrasound transducer 210 or the ultrasound signals output from the third ultrasound transducer 210 to the second ultrasound transducer 210. [ The velocity of the fluid in the pipe 10 is measured based on the time required to be transmitted to the ducer 120.

 The controller 300 controls the thickness of the pipe and the third time required for the ultrasound signal output from the second ultrasonic transducer 120 to be transmitted to the third ultrasonic transducer 210 through the pipe 10, The velocity of the fluid in the pipe 10 is calculated based on the fourth time required for the ultrasonic signal output from the third ultrasonic transducer 210 to pass through the pipe 10 and transferred to the second ultrasonic transducer 120 do.

For example, the third time required for the ultrasonic signal output from the second ultrasonic transducer 120 to be transmitted to the third ultrasonic transducer 210 after passing through the pipe 10 in the forward direction of the flow, 3 ultrasonic wave transmitted from the ultrasonic transducer 210 to the second ultrasonic transducer 120 after passing through the pipe 10 in the reverse direction of the flow, ) The speed of the internal fluid can be measured.

The controller 300 controls the first through third ultrasonic transducers 110, 120 and 210 with a single controller electrically connected thereto.

Specifically, the first ultrasonic transducer 110 and the second ultrasonic transducer 120 can be recognized as one sensor electrically connected directly. The second ultrasonic transducer 120 and the third ultrasonic transducer 210 are controlled by a single controller so that the first through third ultrasonic transducers 110, Can be controlled by a controller.

That is, when measuring the thickness and the flow velocity of the pipe 10 through the flow velocity measuring apparatus 1 of the present invention, as shown in FIG. 3, the first ultrasonic transducer 110 And a signal for measuring a flow velocity which is output from the third ultrasonic transducer 210 and is received by the second ultrasonic transducer 120 is transmitted to the first ultrasonic transducer 110 and the second ultrasonic transducer 120, May appear simultaneously as they are recognized as sensors.

3, the signals received by the first and second ultrasonic transducers 110 and 120 connected to a single sensor are displayed at the same time.

The thickness measurement ultrasonic signal output from the first ultrasonic transducer 110 and received again by the first ultrasonic transducer 110 is reflected on the outer wall of the pipe 10 and appears at 17.5 및 and 34.3 ㎲. At this time, the signal at 17.5 占 퐏 includes a signal when the signal is reflected once at the outer wall of the pipe 10, and the signal at 34.3 占 퐏 is transmitted to the outer wall of the pipe 10 And is incident on the first ultrasonic transducer 110. A signal is generated in the case of being reflected at the inner wall of the pipe 10 (that is, the interface between the pipe 10 and the fluid) between 17.5 mu s and 34.3 mu s.

In addition, at 30 占 퐏, an acoustic wave output from the second ultrasonic transducer 210, reflected in the first wedge 100, and then incident on the second ultrasonic transducer 120 appears again.

Therefore, the flow velocity measuring apparatus 1 of the present invention is characterized in that the first ultrasonic transducer 110, the second ultrasonic transducer 120, and the third ultrasonic transducer 210, which are recognized as one sensor, It is possible to simultaneously measure the thickness and flow velocity of the pipe without having to install a controller for thickness measurement separately.

Hereinafter, a description will be made of a method for eliminating seismic waves that cause inaccurate results in thickness measurement.

FIG. 4 is a view for explaining the elastic waves reflected in the first wedge according to the embodiment of the present invention, and FIGS. 5A to 5C are views for explaining the acoustic waves reflected by the first wedge in the ultrasonic signal received by the flow velocity measuring apparatus according to the embodiment of the present invention Fig. 8 is a view for explaining a method of leaving only a signal including thickness information.

4, the elastic wave may be a wavelength at which a part of the ultrasonic signal output from the second ultrasonic transducer 120 is reflected inside the first wedge 100.

4, the elastic wave is firstly reflected at the contact surface of the first wedge 100 attached to the outer wall of the pipe 10, and is reflected at the side A of the first wedge 100 by the second reflection And can be received by the second ultrasonic transducer 120. Since the acoustic waves are received within the time when the ultrasonic signal for thickness measurement outputted from the first transducer 120 is received, there is a problem that the result of the measurement is inaccurate when the thickness of the pipe 10 is measured.

In order to solve such a problem, according to an embodiment of the present invention, among the ultrasonic signals outputted from the second ultrasonic transducer 120 to the first ultrasonic transducer 110, the elastic waves reflected in the first wedge 100 The side A adjacent to the inclined portion 102 of the first wedge 100 may be spaced apart from the position of the inclined portion 102 by a predetermined distance in the longitudinal direction of the pipe 10. [

The first wedge 100 attached to the outer wall of the pipe 10 when the side A is formed at a predetermined distance in the longitudinal direction of the pipe 10 with respect to the position of the inclined portion 102, The distance from the side A formed by the first ultrasonic signal (elastic wave) reflected from the contact surface of the first ultrasonic sensor to the second ultrasonic signal (elastic wave) is increased, and it takes more time. As a result, the second reflected ultrasonic signal (elastic wave) deviates from the reception time range of the second ultrasonic transducer 120 as shown in FIG. 4, so that the thickness measurement output from the first ultrasonic transducer 110 It is not included within the time when the ultrasonic signal is received. Accordingly, it is possible to solve the problem that the elastic wave generated from the second ultrasonic transducer 120 is received within the time when the ultrasonic signal for thickness measurement is received, thereby making the thickness measurement result of the pipe 10 inaccurate.

According to another embodiment of the present invention, the first ultrasonic transducer 110 may include a first wedge 100 and a second wedge 100 so that the first ultrasonic signal output from the second ultrasonic transducer 120 is not included in the first wedge 100, A groove may be formed adjacent to the side surface A adjacent to the inclined portion 102 of the wedge 100 and the side surface A may be formed in a wedge shape.

Illustratively, when a plurality of grooves are formed on the side surface A adjacent to the inclined portion 102 of the first wedge 100, the shape between the grooves and the grooves is formed into a shape of a plurality of projections by the plurality of grooves , The surface of the side surface A may be formed into a plurality of wedge shapes. As a result, the ultrasonic wave signal (acoustic wave) reflected at the contact surface of the first wedge 100 attached to the outer wall of the pipe 10 is reflected by the flat side surface A such as the side surface A shown in Fig. 4 And can be scattered by diffused reflection in various directions by the wedge-shaped rugged side surface (A). Therefore, it is possible to receive the elastic wave generated from the second ultrasonic transducer 120 within the time when the ultrasonic signal for thickness measurement outputted from the first transducer 120 is received, and thereby to make the thickness measurement result of the pipe 10 inaccurate I can solve the problem.

According to another embodiment of the present invention, when the first ultrasonic transducer 110 includes the elastic waves reflected in the first wedge 100 among the ultrasonic signals output from the second ultrasonic transducer 120, (300) can remove the elastic wave.

5A to 5C, the ultrasonic signals measured by one controller are divided into a thickness measurement ultrasound signal including the thickness information of the pipe 10 and an ultrasound signal Signals appear mixedly. Next, the ultrasonic signal shown in Fig. 5B shows only the fundamental signal, and the fundamental reflected wave at 17 占 퐏 and the acoustic wave at 30 占 퐏 appear in the same phase as 17 占 퐏 and 30 占 퐏 as shown in Fig. 5A. Therefore, when the measured ultrasonic signal of FIG. 5B, in which only the basic signal appears, is removed from the measured ultrasonic signal of FIG. 5A in which the ultrasonic signal including the thickness measurement information is mixed with the basic signal, the thickness information as shown in FIG. The included ultrasonic signal is clearly visible.

Therefore, it is possible to prevent the above-mentioned elastic waves from being received within a range in which ultrasonic signals for thickness measurement are received (time period of 17 占 퐏 to 35 占 퐏 in reference to FIG. 3), or to remove the received acoustic waves even if they are received , The accuracy of the thickness measurement of the pipe 10 can be improved.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: flow rate measuring device 10: pipe
100: first wedge 101: horizontal part
102: slope part 110: first ultrasonic transducer
120: second ultrasonic transducer 130: buffer layer
200: second wedge 202:
210: third ultrasonic transducer 300:

Claims (13)

A flow velocity measuring device comprising:
A first wedge attached to an outer wall of the pipe, the upper surface including a horizontal portion horizontal to the outer wall of the pipe and an inclined portion connected to the other end of the horizontal portion and inclined upwardly with respect to the outer wall of the pipe;
A second wedge opposed to the first wedge and spaced a predetermined distance in a direction in which the pipe extends, disposed on an outer wall of the pipe, the upper surface including the ramp;
A first ultrasonic transducer disposed on a horizontal portion of the first wedge and used for measuring the thickness of the pipe;
Second and third ultrasonic transducers arranged on the slopes of the first wedge and the second wedge, respectively, for use in measuring the flow rate of the pipe; And
Wherein the thickness of the pipe is measured based on a time difference between reflected waves reflected from the inner wall and the outer wall of the pipe by the ultrasonic signal outputted from the first ultrasonic transducer and the thickness of the pipe is measured at any one of the second and third ultrasonic transducers And a controller for measuring a speed of the fluid in the pipe based on a time required for the output ultrasonic signal to be transmitted to the other end,
Wherein a side surface of the first wedge adjacent to the inclined portion is spaced apart from the inclined portion by a predetermined distance in the longitudinal direction of the pipe so that after the ultrasonic signal output from the first ultrasonic transducer is reflected, The time to be transmitted to the ducer is reflected by the contact surface of the first wedge after being output from the second ultrasonic transducer, and the elastic wave reflected from the side surface is shorter than the time for being transmitted to the second ultrasonic transducer,
The control unit
A first time required for the ultrasonic signal output from the first ultrasonic transducer to be reflected from the outer wall of the pipe toward the upper surface to be transmitted to the first ultrasonic transducer and a second time required for the ultrasonic signal outputted from the first ultrasonic transducer The thickness of the pipe is calculated on the basis of a difference in a second time required for the signal to be reflected from the inner wall of the pipe toward the upper surface to be transmitted to the first ultrasonic transducer,
A third time required for the thickness of the pipe and the ultrasonic signal output from the second ultrasonic transducer to be transmitted to the third ultrasonic transducer through the pipe, and a third time required for the ultrasonic wave outputted from the third ultrasonic transducer The flow rate in the pipe is calculated on the basis of a fourth time required for the signal to pass through the pipe and to be transmitted to the second ultrasonic transducer,
The first to third ultrasonic transducers are controlled by one controller,
The ultrasonic signal measured by the one controller
A first wedge base signal, and a thickness measurement ultrasonic signal,
When the elastic wave reflected from the first wedge is included in the ultrasonic signal output from the second ultrasonic transducer,
The control unit
And removes the elastic wave by removing the basic signal from the ultrasonic signal measured by the one controller. delete The method according to claim 1,
Wherein the second wedge is disposed on an outer wall of the pipe in a direction opposite to the first wedge so that each of the angled portions faces each other. The method according to claim 1,
And a buffer layer disposed on the first ultrasonic transducer attached to an upper surface of the first wedge. [Claim 5 is abandoned upon payment of registration fee.] 5. The method of claim 4,
Wherein the buffer layer is made of epoxy and tungsten. [Claim 6 is abandoned due to the registration fee.] 6. The method of claim 5,
Wherein a ratio of the tungsten is higher than a ratio of the epoxy. delete delete delete delete delete The method according to claim 1,
And the side surface adjacent to the inclined portion is formed in a wedge shape. The method according to claim 1,
Wherein the first and second ultrasonic transducers are electrically connected.
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Citations (3)

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Publication number Priority date Publication date Assignee Title
JP2000035418A (en) * 1997-12-01 2000-02-02 Kawasaki Steel Corp Ultrasonic flaw detecting method for cylindrical body and its device, and roll grinding method using it
JP2011095030A (en) * 2009-10-28 2011-05-12 Yokogawa Electric Corp Ultrasonic current meter and ultrasonic flow velocity measuring method
JP2014507667A (en) * 2011-03-07 2014-03-27 フレクシム フレクシブレ インドゥストリーメステヒニーク ゲーエムベーハー Method for ultrasonic clamp-on flow measurement and apparatus for carrying out the method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000035418A (en) * 1997-12-01 2000-02-02 Kawasaki Steel Corp Ultrasonic flaw detecting method for cylindrical body and its device, and roll grinding method using it
JP2011095030A (en) * 2009-10-28 2011-05-12 Yokogawa Electric Corp Ultrasonic current meter and ultrasonic flow velocity measuring method
JP2014507667A (en) * 2011-03-07 2014-03-27 フレクシム フレクシブレ インドゥストリーメステヒニーク ゲーエムベーハー Method for ultrasonic clamp-on flow measurement and apparatus for carrying out the method

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