KR20090003937A - A flowmeter - Google Patents

A flowmeter Download PDF

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Publication number
KR20090003937A
KR20090003937A KR1020070067742A KR20070067742A KR20090003937A KR 20090003937 A KR20090003937 A KR 20090003937A KR 1020070067742 A KR1020070067742 A KR 1020070067742A KR 20070067742 A KR20070067742 A KR 20070067742A KR 20090003937 A KR20090003937 A KR 20090003937A
Authority
KR
South Korea
Prior art keywords
hollow portion
ultrasonic
plate
sensor module
piezoelectric plate
Prior art date
Application number
KR1020070067742A
Other languages
Korean (ko)
Inventor
이봉수
Original Assignee
한국후로셀제조 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국후로셀제조 주식회사 filed Critical 한국후로셀제조 주식회사
Priority to KR1020070067742A priority Critical patent/KR20090003937A/en
Publication of KR20090003937A publication Critical patent/KR20090003937A/en

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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
    • G01F1/66—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
    • G01F1/662—Constructional details
    • 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

Abstract

The flow meter according to the present invention is installed in a pipe through which a fluid flows, and has a flow meter for measuring the amount of fluid flowing through the pipe using ultrasonic waves, the flow meter having an inlet and an outlet connected to the pipe, wherein the fluid is A sensor body having a flowing hollow portion; A sensor module installed in the sensor body between the outlet and the inlet; And a control module for receiving the sensor module, supplying an input signal to the sensor module, and receiving an output signal from the sensor module and electrically connected to the sensor module to calculate a flow rate through the pipe. The module may include an ultrasonic transmitter and an ultrasonic receiver disposed to face each other in the radial direction of the sensor body with the hollow portion interposed therebetween, wherein the ultrasonic transmitter and the ultrasonic receiver are disposed in a mirror image of each other. The unit may include a piezoelectric plate disposed adjacent to the fluid in a receiving space separated through the hollow part and the partition wall; A reflection plate disposed on the opposite side of the hollow portion with the piezoelectric plate interposed therebetween so as to reflect the ultrasonic wave generated from the piezoelectric plate toward the hollow portion; and a transfer medium in a jelly state filled in the receiving space. It is characterized by.

Description

A flowmeter

The present invention relates to a flow meter for measuring the amount of fluid flowing in the pipe, and more specifically, to measure the amount of fluid flowing in the pipe using an ultrasonic sensor, can be installed directly connected to the pipe, the desired measuring position easily It is directed to a flowmeter with an improved structure so that it can be changed.

Generally, an ultrasonic flowmeter using ultrasonic waves is known as a flowmeter for measuring the flow rate of a fluid flowing in a pipe.

The ultrasonic flowmeter is provided with a measuring unit having a vibrator at intervals in the longitudinal direction in the measuring tube through which the fluid flows, and transmits ultrasonic waves from one of the vibrators to be received by the vibrator on the other side, and further receives ultrasonic waves from the vibrator on the other side. It transmits and receives by one vibrator, the flow velocity of the fluid in a measurement tube is calculated | required from the difference of these ultrasonic propagation time, and a flow volume is measured from this flow velocity.

However, the ultrasonic flowmeter has a problem that the flow rate measurement may be inaccurate due to an installation error because the ultrasonic flowmeter must be installed separately from the ultrasonic transmitting vibrator and the receiving vibrator. In addition, the conventional ultrasonic flowmeter is fixed to the outer periphery of the pipe through which the fluid flows, so when changing the measurement position there is a problem that is not easy to reposition the flowmeter. In addition, the conventional ultrasonic flowmeter is to calculate the flow rate by the difference in the transmission time of the ultrasonic signal in the flow direction of the fluid. In this case, there is a problem that the yield is lowered because the path through which the ultrasound is transmitted from the ultrasound transmitter to the ultrasound receiver is refracted. In addition, since the conventional flowmeter is installed directly in the pipe through which the fluid flows, if the pressure of the fluid flowing in the pipe suddenly increases, there is a risk that the pipe is broken at the point where the flowmeter is installed and the fluid may flow out.

The present invention has been made to solve the problems described above, the object of the present invention is to provide a flow meter that is easy to install in a desired measurement position, high measurement accuracy of the flow rate, the structure is improved so as not to damage the pipe installed have.

Flow meter according to the present invention is provided with a sensor body having an inlet and an outlet, it can be easily connected to any part of the tube to be measured, there is a simple effect of installation, the sensor module is installed so as to cross the flow of the fluid to be measured Therefore, the yield is high, there is an effect that can increase the measurement accuracy of the flow rate.

In order to achieve the object as described above, the flow meter according to the present invention,

 In a flowmeter which is installed in a pipe through which a fluid flows, and measures the amount of fluid flowing through the pipe by using ultrasonic waves,

A sensor body having an inlet and an outlet connected to the pipe and having a hollow portion through which the fluid flows;

A sensor module installed in the sensor body between the outlet and the inlet; And

A control module electrically connected to the sensor module for receiving the sensor module, supplying an input signal to the sensor module, receiving an output signal from the sensor module, and calculating a flow rate flowing through the pipe;

The sensor module includes an ultrasonic transmitter and an ultrasonic receiver arranged to face each other in the radial direction of the sensor body with the hollow portion interposed therebetween.

The ultrasonic transmitter and the ultrasonic receiver are disposed in a mirror image of each other,

The ultrasonic transmitter,

A piezoelectric plate disposed adjacent to the fluid in a receiving space separated through the hollow part and the partition wall;

A reflecting plate disposed on the opposite side of the hollow portion with the piezoelectric plate interposed so as to reflect ultrasonic waves generated from the piezoelectric plate toward the hollow portion; and

It characterized in that it comprises a; delivery medium in a jelly state (jelly) is filled in the receiving space.

Preferably, the hollow portion is formed with an acceleration plate disposed in the radial direction of the hollow portion so as to increase the speed of the fluid flowing through the hollow portion.

It is preferable to include a buffer plate provided between the piezoelectric plate and the reflecting plate and in contact with the piezoelectric plate and the reflecting plate and having a lower hardness than the reflecting plate and having rubber elasticity.

The piezoelectric plate may have a circular disk shape, and an electrode terminal electrically connected to the control module may be disposed on an outer circumferential surface of the disk shape.

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

1 is a perspective view of a flow meter according to a preferred embodiment of the present invention. FIG. 2 is an exploded perspective view of the flow meter shown in FIG. 1. FIG. 3 is a view showing a sensor module extracted from the flow meter shown in FIG. 4 is a schematic cross-sectional view of the IV-IV line shown in FIG. FIG. 5 is a schematic cross-sectional view of the VV line shown in FIG. 3.

1 to 5, the flow meter 10 according to the preferred embodiment of the present invention includes a sensor body 20, a sensor module 30, and a control module 40.

The sensor body 20 includes an inlet 22, an outlet 24, a receiving space 27, and an accelerator plate 28. The sensor body has a hollow portion 25 that is open in the flow direction of the fluid therein. The inlet 22 is disposed at one end of the hollow portion 25. The inlet is connected upstream of the fluid of the tube to be measured. The outlet 24 is disposed at the other end of the hollow portion 25. The inlet is connected downstream of the fluid of the tube to be measured. The accommodation space 27 is separated from the hollow portion 25 by a partition wall. The accommodation space 27 is a space for installing the sensor module 30 to be described later. Two accommodation spaces 27 are provided. In one of the accommodation spaces 27, an ultrasonic transmitter 32 to be described later is disposed. In another of the accommodation spaces 27, an ultrasonic receiver 34 to be described later is disposed. The receiving spaces 27 are arranged in a mirror shape so as to face each other with the hollow portion 25 interposed therebetween. The accommodation space 27 is provided with a passage 29 whether it can be connected to the control module 40 to be described later. The accelerator plate 28 is provided in the hollow portion. The accelerator plate 28 separates the hollow portion 25 into a plurality of spaces. The accelerator plate 28 is disposed in the radial direction of the hollow portion 25. The accelerator plate 28 is provided to increase the speed of the fluid flowing through the hollow portion 25. The sensor module 30 is relatively fixed to the control module 40 by fixing means such as a separate cover 16 and a screw 18.

The sensor module 30 includes an ultrasonic receiver 34 and an ultrasonic transmitter 32. The ultrasonic transmitter 32 and the ultrasonic receiver 34 are arranged in a mirror image of each other. More specifically, the components of the ultrasonic transmitter 32 and the ultrasonic receiver 34 are the same, and are disposed in the accommodation space 27 with the hollow portion 25 therebetween.

The ultrasonic transmitter 32 and the ultrasonic receiver 34 include piezoelectric plates 320 and 320a, buffer plates 330 and 330a, reflective plates 340 and 340a, and a transmission medium 350. For convenience of description, the components of the ultrasonic transmitter 32 will be described, and the components of the ultrasonic receiver 34 will refer to the description of the components of the ultrasonic transmitter 32.

The piezoelectric plate 320 is provided with an electrode in a piezoceramic material, and vibrates with ultrasonic frequency as an alternating current or a pulse current is supplied. On the other hand, when the piezoelectric plate 320 vibrates by an external force, a current is generated from the piezoelectric plate 320. The frequency of the piezoelectric plate 320 was manufactured to have a frequency of 2 MHz in the present invention. The piezoelectric plate 320 is disposed in the accommodation space 27. The piezoelectric plate 320 is disposed to face each other with the hollow portion 25 and the partition wall therebetween. That is, the piezoelectric plate 320 is disposed to be adjacent to each other with the fluid flowing through the hollow portion 25 and the partition wall therebetween. The piezoelectric plate 320 has a circular disk shape. The electrode terminal 325 is provided on the outer circumferential surface of the piezoelectric plate 320. Two electrode terminals 325 are provided. The electrode terminals 325 are electrically connected to the control module 40 to be described later by a wire or the like.

The buffer plate 330 is provided to contact the piezoelectric plate 320. More specifically, the buffer plate 330 is installed between the piezoelectric plate 320 and the reflecting plate 340 to be described later and is provided to contact the piezoelectric plate 320 and the reflecting plate 340. The buffer plate 330 preferably has a lower hardness than the reflector plate 340 described later. The buffer plate 330 has rubber elasticity. The buffer plate 330 partially reflects the vibration generated from the piezoelectric plate 320 and transmits the reflected plate 340 to the reflective plate 340 which will be described later.

The reflective plate 340 is disposed on the opposite side of the hollow portion 25 with the piezoelectric plate 320 interposed therebetween so as to reflect the ultrasonic waves generated from the piezoelectric plate 320 toward the hollow portion 25. . More specifically, the reflector plate 340 is disposed to contact the buffer plate 330. The reflective plate 340 is preferably made of a material having a greater hardness than the buffer plate 330. In the present embodiment, the reflective plate 340 is made of a plastic material, and the buffer plate 330 is made of a rubber material.

The delivery medium 350 is filled in the accommodation space (27). The delivery medium 350 is a material in a jelly state of fluidity. The transmission medium 350 is provided to allow the ultrasonic waves generated by the piezoelectric plate 320 to be well transmitted. That is, it is provided to facilitate the ultrasonic transfer between the piezoelectric plate 320, the buffer plate 330 and the reflecting plate 340 in the receiving space (27).

The control module 40 accommodates the sensor module 30. The control module 40 supplies an input signal to the sensor module 30 and receives an output signal from the sensor module 30 to calculate a flow rate flowing through the pipe. The control module 40 is electrically connected to the sensor module 30. More specifically, as described above, the electrode terminals 325 provided on the piezoelectric plate 320 are electrically connected to each other by a wire or the like. The control module 40 can be easily modified to manufacture a conventional electric and electronic circuit, and since the core is not a key part of the present invention, a detailed description thereof will be omitted. The piezoelectric plate 320a included in the ultrasonic receiver 34, the buffer plate 330a, the reflecting plate 340a, and the transmission medium 350 may include the piezoelectric plate 320 included in the ultrasonic transmitter 32. The description of the buffer plate 330, the reflector plate 340, and the transmission medium 350 will be referred to.

Hereinafter, the operation of the flow meter 10 having such a configuration will be described in detail.

In order to explain the operation of the flow meter 10, it is assumed that the flow meter 10 is connected to a pipe through which a fluid flows. Therefore, the fluid flows from the inlet 22 provided in the sensor body 20 through the hollow portion 25 to the outlet 24. At this time, a current signal having a pulse from the control module 40 is supplied to the electrode terminals 325 of the piezoelectric plate 320 disposed in the ultrasonic transmitter 32. Then, the piezoelectric plate 320 vibrates with a frequency of 2 MHz. Therefore, ultrasonic waves are generated in the front-rear direction of the piezoelectric plate 320. A part of the ultrasonic waves immediately passes through the hollow portion 25 to reach the piezoelectric plate 320a disposed in the ultrasonic receiver 34. On the other hand, the other part of the ultrasonic wave generated in the piezoelectric plate 320 of the ultrasonic transmitter 32 is transmitted to the buffer plate 330, part is reflected and part is transmitted to the reflecting plate 340. Since the reflector plate 340 is made of a material having a relatively high hardness compared to a fluid such as water through which the ultrasound is well transmitted, the ultrasonic wave transmitted to the reflector plate 340 is reflected after hitting the reflector plate 340 and the hollow part ( 25). The ultrasonic waves passing through the hollow part 25 reach the piezoelectric plate 320a of the ultrasonic receiver 34. The ultrasonic waves that reach the piezoelectric plate 320a of the ultrasonic receiver 34 vibrate the piezoelectric plate 320a. As a result, a current signal is generated in the piezoelectric plate 320a of the ultrasonic receiver 34. The current signal generated from the piezoelectric plate 320a of the ultrasonic receiver 34 is input to the control module 40 so that the basic data for calculating the amount of fluid flowing through the hollow portion 25 from the intensity of the signal is provided. do. In this process, when a lot of fluid flows through the hollow portion 25, the intensity of the ultrasonic waves transmitted from the ultrasonic transmitter 32 to the ultrasonic receiver 34 is weak. That is, the amount of ultrasonic waves generated by the ultrasonic transmitter 32 is lost by the fluid flowing through the hollow portion 25 in the hollow portion 25. On the other hand, when less fluid flows through the hollow portion 25, the intensity of the ultrasonic waves transmitted from the ultrasonic transmitter 32 to the ultrasonic receiver 34 is relatively strong. That is, the amount of ultrasonic waves generated from the ultrasonic transmitter 32 is reduced by the fluid flowing through the hollow portion 25 in the hollow portion 25. The control module 40 can calculate the amount of fluid flowing through the hollow portion 25 by the difference in the ultrasonic intensity. In this process, the accelerator plate 28 provided in the hollow portion 25 divides the space of the fluid flowing through the hollow portion 25 into a plurality of effects to increase the speed of the fluid flowing through the hollow portion 25. There is. That is, by increasing the speed of the fluid flowing in the hollow portion 25 has the effect of increasing the intensity of the ultrasonic wave received by the ultrasonic receiver 34 to increase the yield of the ultrasonic wave received. In addition, since the delivery medium 350 filled in the accommodation space 27 has fluidity, the delivery medium 350 has an effect of transmitting the ultrasonic waves generated by the ultrasonic transmitter 32 well. In addition, the electrode terminals 325 and 325a disposed on the outer circumferential surfaces of the piezoelectric plates 320 and 320a allow the ultrasonic wave generating surfaces of the piezoelectric plates 320 and 320a to be perpendicular to the fluid flowing through the hollow portion 25. The ultrasonic wave generated from the plate 320 is minimized by maintaining the path of the ultrasonic wave transmitted to the piezoelectric plate 320a provided in the ultrasonic receiver 34 at the shortest distance.

Thus, the flow meter 10 is provided with a sensor body 20 having an inlet 22 and an outlet 24, so that it can be easily connected to any part of the pipe to be measured, there is a simple installation effect, to measure Since the sensor module 30 is installed to traverse the flow of the fluid to have a high yield has the effect of increasing the measurement accuracy of the flow rate.

In the embodiment of the present invention, it is described that the hollow part is formed with an acceleration plate disposed in the radial direction of the hollow part so as to increase the speed of the fluid flowing through the hollow part. It will be lower but can achieve the object of the present invention.

In the exemplary embodiment of the present invention, the piezoelectric plate is disposed between the reflective plate and the piezoelectric plate and the reflecting plate, and is described as including a buffer plate having a lower hardness and rubber elasticity than the reflective plate. Even if no buffer plate is provided, the object of the present invention can be achieved.

In the exemplary embodiment of the present invention, the piezoelectric plate has a circular disk shape, and an electrode terminal electrically connected to the control module is disposed on an outer circumferential surface of the disk shape, but the piezoelectric plate is a rectangular disk, or a disk shape. Even if the electrode terminal is not disposed on the outer circumferential surface of the present invention, if the ultrasonic wave generated by the ultrasonic transmitter can reach the ultrasonic receiver well, the object of the present invention can be achieved.

The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the above examples, and various forms of embodiments may be embodied without departing from the technical spirit of the present invention.

1 is a perspective view of a flow meter according to a preferred embodiment of the present invention.

FIG. 2 is an exploded perspective view of the flow meter shown in FIG. 1. FIG.

3 is a view showing a sensor module extracted from the flow meter shown in FIG.

4 is a schematic cross-sectional view of the IV-IV line shown in FIG.

FIG. 5 is a schematic cross-sectional view of the VV line shown in FIG. 3.

<Description of the symbols for the main parts of the drawings>

10.Flowmeter 15 ... Control module

16 ... cover 18 ... screw

20 Sensor body 22 Inlet

24.Outlet 25.Hollow

27.Accommodating space 28 ... Acceleration board

30 ... Sensor module 32 ... Ultrasound transmitter

34 Ultrasonic receiver 320, 320a ... Piezoelectric plate

325,325a ... electrode terminal 330,330a ... buffer plate

340,340a ... reflective plate 350 ...

Claims (4)

In the flowmeter which is installed in the pipe through which a fluid flows, and measures the quantity of the fluid which flows through the pipe using an ultrasonic wave, A sensor body having an inlet and an outlet connected to the pipe and having a hollow portion through which the fluid flows; A sensor module installed in the sensor body between the outlet and the inlet; And A control module electrically connected to the sensor module for receiving the sensor module, supplying an input signal to the sensor module, receiving an output signal from the sensor module, and calculating a flow rate flowing through the pipe; The sensor module includes an ultrasonic transmitter and an ultrasonic receiver arranged to face each other in the radial direction of the sensor body with the hollow portion interposed therebetween. The ultrasonic transmitter and the ultrasonic receiver are disposed in a mirror image of each other, The ultrasonic transmitter, A piezoelectric plate disposed adjacent to the fluid in a receiving space separated through the hollow part and the partition wall; A reflecting plate disposed on the opposite side of the hollow portion with the piezoelectric plate interposed so as to reflect ultrasonic waves generated from the piezoelectric plate toward the hollow portion; and Flow meter comprising a; a delivery medium in a jelly state (jelly) filled in the receiving space. The method of claim 1, The flow meter, characterized in that the hollow portion is formed with an acceleration plate disposed in the radial direction of the hollow portion to increase the speed of the fluid flowing through the hollow portion. The method of claim 1, And a buffer plate disposed between the piezoelectric plate and the reflecting plate and in contact with the piezoelectric plate and the reflecting plate, the buffer plate having a lower hardness than the reflecting plate and having rubber elasticity. The method according to any one of claims 1 to 3, The piezoelectric plate has a circular disk shape, and an electrode terminal electrically connected to the control module is disposed on an outer circumferential surface of the disk shape.
KR1020070067742A 2007-07-05 2007-07-05 A flowmeter KR20090003937A (en)

Priority Applications (1)

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KR1020070067742A KR20090003937A (en) 2007-07-05 2007-07-05 A flowmeter

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Application Number Priority Date Filing Date Title
KR1020070067742A KR20090003937A (en) 2007-07-05 2007-07-05 A flowmeter

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KR20090003937A true KR20090003937A (en) 2009-01-12

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Application Number Title Priority Date Filing Date
KR1020070067742A KR20090003937A (en) 2007-07-05 2007-07-05 A flowmeter

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