KR101284008B1 - Ultrasonic flowmeter for fully or partially filled pipeline - Google Patents

Abstract

The present invention relates to a full tube-obesity tube combined ultrasonic flow meter.
Manganese-obesity pipe complex ultrasonic flowmeter according to the present invention, is installed in the pipeline through which the fluid flows, a measuring tube having a flow path is formed so that the fluid flowing through the pipe flows through the inside, it consists of a pair of the flow direction of the fluid A plurality of pairs of ultrasonic sensors disposed to face each other along the direction of the photo, spaced apart along the height direction of the measuring tube, installed in the measuring tube to measure the level of fluid flowing through the inside of the measuring tube and the lower portion of the flow path inside the measuring tube It includes a repair structure having a flat portion disposed in parallel to the wings and wings that are bent from both ends of the flat portion and disposed in contact with both inner surfaces of the measuring tube.

Description

Ultrasonic flow meter for fully or partially filled tube {Ultrasonic flowmeter for fully or partially filled pipeline}

The present invention relates to a flow meter for measuring the flow rate and flow rate of a fluid, in particular, when the fluid flows in a tube full state filled with the tube and the fluid flows in a state of obesity tube partially filled with the tube, ultrasonic wave The present invention relates to a total tube-obesity tube complex ultrasonic flowmeter which measures a flow rate by using.

The flow meter is used to measure and manage the flow rate of the fluid in the pipeline, such as the supply of water through the water pipe, the transportation of crude oil through the oil pipe, and the supply of agricultural water through the channel.

In recent years, ultrasonic flowmeters are installed in pipelines to receive and receive ultrasonic waves from the ultrasonic sensors to measure flow rates, and ultrasonic flowmeters for measuring flow rates using these flow rates are frequently used.

Ultrasonic flowmeters are divided into tube tubes for measuring the flow rate in the tube which is transported while the fluid always fills the tube and obesity tube for measuring the flow rate in the tube which is conveyed without the fluid filling the tube.

In the case of the all-tube tube and the obese tube ultrasonic flowmeter, the flow rate is measured by using an ultrasonic sensor, but in the case of the obese tube, it is different in that a level gauge for measuring the fluid level must be separately installed.

Conventional obesity flowmeters are shown in FIGS. 1 and 2.

1 is a schematic side view of a state in which a conventional ultrasonic flowmeter for obesity pipes is installed in a pipeline, and FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.

1 and 2, the conventional obesity tube flow meter 9 includes a measuring tube 1 in which a conduit is formed. The measuring pipe 1 is inserted into a pipe, for example, a water supply pipe p, so that the constant flows through the pipe inside the measuring pipe 1.

The measuring tube 1 is provided with a plurality of pairs of ultrasonic sensors 2 and 3. The plurality of pairs of ultrasonic sensors are spaced apart at regular intervals along the height direction of the measuring tube 1. In the present embodiment, five pairs of ultrasonic sensors 2 and 3 are installed, and the ultrasonic sensor pair 3 disposed at the bottom thereof is the lower 15 to the entire measuring tube 1 height as shown in FIG. 2. Installed at a height of 20%. The measurement of the flow rate using the ultrasonic wave is performed by the ultrasonic wave of the measuring tube 1 passing through the fluid and receiving it. When the water level does not rise to the height of the ultrasonic sensor pair 3 installed at the lowest level of the flowmeter, the flow rate measurement is performed. impossible.

After deriving the relationship between the fluid level and the flow rate in the region where the flow rate is measurable, the lower region where the flow rate measurement is impossible, as shown in FIG. 3, extrapolates the relationship curve between the fluid and the water level to estimate the flow rate. It was.

And a water level meter 4 is installed on the upper part of the measuring tube 1 to emit ultrasonic waves or sound waves to receive the wave reflected from the surface of the fluid to measure the water level, the lower part of the measuring tube 1 is circular and the water level is also low If the surface of the fluid is not formed in parallel, as shown in Figure 2, to form a curved surface (c). Therefore, there is a problem that the water level measurement is inaccurate because the phase of the reflected wave reflected from the water after being emitted from the water gauge 4 is delayed.

On the other hand, if the flow rate is very small, the flow rate is shown to be slow, if the flow rate is so slow, even if the water level rises above the ultrasonic sensor pair, there was a problem that the flow rate measurement using the ultrasonic wave is not easy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an improved manganese-obesity tube complex ultrasonic flowmeter in which the structure is improved to allow accurate flow rate measurement even when the flow rate is small in the obesity tube state.

According to an aspect of the present invention, there is provided a manganese-obesity pipe complex ultrasonic flowmeter, which is installed in a pipe through which a fluid flows, and has a flow path formed therein so that the fluid flowing through the pipe flows therein; A plurality of pairs of ultrasonic sensors disposed in a pair so as to face each other in a direction inclined with respect to the flow direction of the fluid and spaced apart along the height direction of the measuring tube; A depth gauge which is installed in the measuring tube and measures the level of the fluid flowing in the measuring tube; And a repair structure including a flat part disposed parallel to a lower portion of the measuring tube inner flow path, and a wing part bent from both ends of the flat part to be in contact with both inner surfaces of the measuring tube.

According to the present invention, the repair structure is disposed inclined from the tip of the flat portion to the bottom surface of the measuring tube, the main guide portion for allowing the fluid to be guided from the conduit into the measuring tube, and the main guide It further includes a wing guide portion disposed between the side surface portion of the portion and the wing portion and the inner surface of the measuring tube.

In the repair structure, the width of the flat part is 1/2 of the inner diameter of the measuring tube, and the wing part is bent upwardly at an angle of 30 ° from both ends of the flat part to be symmetrically formed.

In the present invention, the area of the flow path formed by the repair structure and the inner surface of the measurement tube is smaller than the area of the pipeline, so that the flow rate of the fluid introduced into the flow path of the measurement tube from the pipeline increases.

In the present invention, the depth gauge is installed below the flat portion of the repair structure.

According to one embodiment of the present invention, an air blower for injecting air to the upper side of the repair structure is installed at the lower end of the repair structure to prevent the accumulation of deposits on the repair structure.

In the present invention, by installing a hydraulic structure in the lower part of the measuring tube, the relationship between the flow rate and the water level is formed to be close to the actual, there is an advantage that more accurate flow rate estimation is possible even when the water level is very low.

In addition, in the present invention, the cross-sectional area through which the fluid flows due to the hydraulic structure is reduced, so that the venturi effect is generated, thereby increasing the flow velocity of the fluid, thereby accurately measuring the flow rate, and allowing the removal of the deposits inside the measuring tube due to the increased flow rate. There is.

In addition, the lower part of the hydraulic structure is formed horizontally, the level of the fluid is more horizontally formed, the phase delay problem is solved in the reflected wave reflected by the depth gauge so that the water level measurement is accurate, the flow rate measurement is also accurate.

1 is a schematic side view of a state in which a conventional ultrasonic flowmeter for obesity pipes is installed in a water supply pipe.
FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1.
3 is a graph showing the relationship between the fluid level and the flow rate.
4 is a schematic perspective view of an ultrasonic flowmeter according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. 4.
FIG. 6 is a schematic cross-sectional view taken along the line VI-VI of FIG. 4.
FIG. 7 is a planar view of the ellipse shown in FIG. 4.

Hereinafter, with reference to the accompanying drawings, it will be described in more detail with respect to the manganese-obesity tube complex ultrasonic flowmeter according to an embodiment of the present invention.

4 is a schematic perspective view of an ultrasonic flowmeter according to an embodiment of the present invention, FIG. 5 is a schematic cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is a schematic cross-sectional view taken along the line VI-VI of FIG. 4.

4 to 6, the manganese-obesity tube combined ultrasonic flowmeter (100, hereinafter referred to as an "ultrasound flowmeter") according to one embodiment of the measuring tube 10, a plurality of pairs of ultrasonic sensors 20 And a depth gauge 30 and the repair structure 40.

The measuring tube 10 is installed in a pipe p through which a fluid flows, such as a water supply pipe, and is formed in a hollow tubular shape so that the fluid can flow through the inside thereof. The measuring tube 10 is provided with flange portions 13a and 13b at both ends, and coupling holes 16 are formed in the flange portions 13a and 13b. Similarly, a flange portion in which a through hole c is formed is provided in a pipe p such as a water supply pipe. The bolt (b) is fitted into the through hole (c) and the coupling hole (16) and screwed to the nut (n), so that the measuring tube (10) is coupled to the pipe (p).

In addition, a plurality of saddles 15 are attached to the measurement tube 10. The saddle 15 is disposed to be inclined with respect to the direction of the central axis of the measuring tube 10 as a portion to which the ultrasonic sensor 20 to be described later is fitted and fixed.

The saddle 15 is formed in a hollow shape, and the measuring tube 10 at the point where the saddle 15 is attached is perforated so that the saddle 15 communicates with the inside of the measuring tube 10. As will be described later, since the ultrasonic flowmeter 100 according to the present embodiment is a five-line flowmeter, five pairs of ultrasonic sensors 20 are installed, and five pairs of saddles 15 are also attached.

Five pairs of saddles 15 are disposed on an ellipse or an orthogonal ellipse indicated by reference numeral h in FIG. 4. This ellipse is inclined with respect to the axial direction of the measurement tube 10. Referring to FIG. 7 in which the ellipse h is projected onto the plane, it can be seen that the saddle 15 is disposed on each side of the saddle 15 at two sides.

Each saddle 15 is fitted with an ultrasonic sensor 20. The ultrasonic sensors 20 are installed in pairs to face each other. That is, in the ellipse of FIG. 4, two ultrasonic sensors face each other on a straight line parallel to the long axis to form a pair, and five pairs are installed to form five lines. In Fig. 7, the straight lines indicated by reference numerals L1, L2, L3, L4, and L5 each form one line, and these lines L1 to L5 are disposed to be inclined with respect to the axial direction of the measuring tube 11.

Since the straight lines connecting the ultrasonic sensor pairs are horizontally arranged, they are arranged in parallel with the water level surface s of the fluid flowing inside the measuring tube 10. When the fluid is in a full tube state filled with the measuring tube 10, Although the flow rate is measured by the six pairs of ultrasonic sensors 20, for example, if the water level is between the three lines (L3) and four lines (L4), as shown in Figure 7, the flow rate is measured only by the three lower ultrasonic sensor pairs The flow rate is not measured by the two upper pairs of ultrasonic sensors. The flow rate is because ultrasonic waves must be launched and received through the fluid. The measurement of flow velocity and flow rate using ultrasonic waves will be briefly described.

Each pair of ultrasonic sensors sends and receives ultrasonic waves corresponding to each other. That is, the ultrasonic waves emitted from the ultrasonic sensor disposed upstream in the advancing direction of the fluid are received by the ultrasonic sensors disposed downstream through the fluid, and the ultrasonic waves emitted from the ultrasonic sensor disposed downstream from the downstream receive the fluid. It propagates through and is received by an ultrasonic sensor disposed upstream.

The controller (not shown) is electrically connected to each of the ultrasonic sensors 20 to control the operation of the ultrasonic sensors 20. That is, the controller transmits the ultrasonic emission signal to cause the ultrasonic wave to be emitted from the ultrasonic sensor located upstream or downstream. When the ultrasonic wave thus emitted is received by the ultrasonic sensor on the opposite side through the fluid, the received signal is transmitted to the controller again, and the controller measures the time from the time of transmitting the ultrasonic wave firing signal to the time of reaching the ultrasonic wave receiving signal. In addition, the ultrasonic sensor, which has received the ultrasonic wave, emits the ultrasonic wave, and the ultrasonic sensor that has emitted the ultrasonic wave receives the ultrasonic wave to measure time. The ultrasonic propagation time measured in the above two processes is different from each other by the velocity of the fluid, and the flow velocity of the fluid is calculated using this time difference. With the flow velocity of the fluid known, the flow rate of the fluid can be calculated by multiplying the cross-sectional area of the fluid filling the inside of the measuring tube 10.

At this time, the ultrasonic sensor used is divided into liquid and gas, and since the use frequency varies depending on the type of the fluid, the operation is determined according to each fluid property. For example, the flow rate ultrasonic sensor for liquids has a frequency of about 500kHz to 2MHz for pipelines, and the ultrasonic sensor for level measurement is less than 100kHz. And it has a property that is well reflected by the resistance at the interface. Therefore, each sensor is difficult to detect the signal because the flow rate sensor is too attenuated in the air. That is, the velocity sensor exposed to air does not work (the rate of attenuation with distance is inversely proportional to the square of the frequency).

In order to know the area in which the fluid fills the inside of the measuring tube 10, it is necessary to know the level or depth of the fluid. In the present invention, the depth gauge 30 is installed. In the ultrasonic flowmeter for the obesity tube, the level gauge for measuring the fluid level is generally installed on the upper part of the measuring tube. In the present invention, the depth gauge 30 is installed below the measuring tube 10.

The depth gauge has a structure including an acoustic coupling in front of the ultrasonic sensor to compensate for the dead zone, and can perform a signal processing function to compensate for the sound velocity according to temperature, and can be combined dry or wet. Do.

This is because if the liquid depth meter 30 is installed rather than the upper air level meter, the operating frequency is the same as that of the flow rate sensor so that a circuit can be configured without additional auxiliary circuits or devices.

In addition, in order to measure the propagation time of the reciprocating traveling wave of the depth gauge, it is necessary to avoid the overlap of the launch and the receive wave, so there is no dead zone. However, the shape of the depth gauge 30 coupled to the horizontal part of the hydraulic structure is inserted or The assembly is attached to the outer wall and includes a dead distance, so that the combination is present in the front end, and sufficient sensing progress is made before entering the fluid, and the fluid is reciprocated and manufactured to be received by the sensor after reentry. This coupling part uses a plastic or acoustic material with a slow ultrasonic transmission rate. Therefore, through the combination of the structure of the depth gauge, the material of the combination, and the water tank, the frequency used can be increased or matched with the flow rate sensor, so that the accuracy can be much higher than that of the air level gauge, and the ambient influence such as temperature can be eliminated. Can be. This is because the speed of sound is known by the length and temperature of the binder.

The depth gauge 30 emits ultrasonic waves toward the fluid, receives the reflected wave reflected from the water surface again, and calculates the time from the launch to the reception to measure the fluid level.

On the other hand, as described in the prior art, even if the flow rate of the fluid is so small that it is impossible to measure the flow rate by the ultrasonic sensor pair disposed at the lowest level of the flowmeter, or even the water level has risen to the lowest ultrasonic sensor pair, the fluid flow rate is very small and accurate. If measurement is not possible, use the relationship between flow rate and flow rate to estimate the flow rate. These flow-flow curves are experimentally demonstrated to be more reproducible in hydraulic structures.

In the present invention, in order to solve the above problems, the repair structure 40 is installed on the inner lower side of the measuring tube (10). The hydraulic structure 40 has a flat portion 41 and a pair of wings 42.

The flat part 41 has a flat shape and is disposed in parallel with the horizontal plane, and the pair of wing parts 42 are bent upward from both end portions of the flat part 41 to be in contact with both inner surfaces of the measuring tube 10. do.

As shown in FIG. 5, the planar portion 41 of the hydraulic structure 40 lies parallel to the 1/6 position (D / 6) of the inner diameter (diameter, D) from the lowest point of the measuring tube 10, The width of the flat portion 41 is formed to a size 1/2 of the inner diameter of the measuring tube 10. And the wing | blade part 42 is bent upward by the angle of 30 degrees from the plane part 41, The width | variety of the wing | blade part 42 in a horizontal direction is formed in the magnitude | size (D / 4) of 1/4.

And the repair structure 40 is formed with a main guide portion 43 and the wing guide portion 44. As described above, since the flat portion 40 of the repair structure 40 is installed at a position as high as D / 6 from the lowest point of the measuring tube 10, the repair structure 40 is an obstacle to the fluid flowing through the pipe p. Will act as. Thus, in one embodiment of the present invention by arranging the main guide portion 43 inclined from the distal end of the flat portion 41 to the bottom surface of the measuring tube 10, the fluid flowing through the pipe (p) is smooth and gentle measuring tube ( 10) to be introduced into the inside. Similarly, wing guides 44 are formed to extend from both sides of the main guide part 43, and are arranged to contact the inner surface of the wing part 42 and the measuring tube 10, so that the fluid flows smoothly from the pipe p. 10) Aid inflow inside.

When the repair structure 40 is installed inside the measurement tube 10 in this way, an effect of more accurately measuring the flow rate occurs.

The first effect is that when the hydraulic structure 40 of the above-described configuration is installed, the relationship curve between the water level and the flow rate as shown in FIG. It was confirmed by empirical consideration that the flow rate of the fluid appeared closer to the actual level when passing through the hydraulic structure consisting of the flat part and the wing part, compared to the case where the measuring tube was circular. Therefore, the relationship between the flow rate and the water level in the area that can be measured by the ultrasonic sensor pair and extrapolating the graph to the low water level has an advantage that the flow rate in the low water level can be obtained close to the actual value.

The second effect is that the flow velocity of the fluid is increased so that the measurement of the flow velocity of the fluid through the ultrasonic sensor 20 is more accurate. When the hydraulic structure 40 is installed in the measuring tube 10, the cross-sectional area through which the fluid can flow becomes narrower than the pipe line p. That is, the venturi effect occurs due to the narrow area through which the fluid can flow, so that the flow velocity of the fluid increases in the measurement tube 10. Increasing the flow velocity of the fluid makes the measurement of the flow rate through ultrasonic waves more accurate, which is advantageous in calculating the flow rate.

The third effect is that the depth measurement by the depth gauge is accurate. As described in the prior art, when the lower portion of the measuring tube 10 is formed in a circular shape, the water surface is not arranged in parallel, but is curved, so there is a problem that a phase delay occurs in the reflected wave of the ultrasonic wave emitted from the water gauge. However, when the repair structure 40, such as the present invention, is installed, since the lower portion of the measuring tube 10 is flat, the surface of the fluid is formed horizontally rather than curved, so that the water level measurement is accurate. Accurate measurement of the water level provides an accurate indication of the cross-sectional area through which the fluid flows, allowing accurate flow rate calculations.

The fourth effect is incidental to the first effect above. That is, when the flow velocity is increased by narrowing the cross-sectional area through which the fluid can flow, the sediment deposited on the lower portion of the measuring tube 10 is swept away by the fluid, thereby causing the effect of cleaning the inside of the measuring tube 10.

That is, by installing the repair structure 40, the above four effects are generated, and these are all factors related to the flow rate and flow rate of the fluid, so that the flow rate in the obesity tube state by the repair structure 40 described above It can measure precisely.

Meanwhile, in one embodiment of the present invention, an air blower 50 or a drain device is installed below the repair structure 40 to further enhance the cleaning function. The flat part of the repair structure 40 is formed with a hole 49 to communicate with the air blower 50. When the air is blown from the air blower 50, the air is aerated to the upper portion of the repair structure 40 to deposit the deposits. Perform the function of removing.

As described above, in the present invention, by installing a hydraulic structure in the lower part of the measuring tube, the relationship between the flow rate and the water level is approximated to the actual value, so that even more accurate flow rate estimation is possible even when the water level is very low. The flow rate measurement is increased by increasing the flow rate of the water, and the water level surface is formed in parallel, so that the water level measurement is accurate, so that the flow rate measurement is also accurate.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation and that those skilled in the art will recognize that various modifications and equivalent arrangements may be made therein. It will be possible. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

100 ... Tube-Obes Tube Ultrasonic Flowmeter
10 ... measuring tube 20 ... ultrasonic sensor
30 ... depth 40 ... hydraulic structures
41 ... flat part 42 ... wing part
43 ... main guide section 44 ... wing guide section
p ... pipeline s ... water level

Claims (7)

A measurement tube installed in a fluid flow path, the flow path being formed such that a fluid flowing through the pipe flows through the inside;
A plurality of pairs of ultrasonic sensors disposed in a pair so as to face each other in a direction inclined with respect to the flow direction of the fluid and spaced apart along the height direction of the measuring tube;
A depth gauge which is installed in the measuring tube and measures the level of the fluid flowing in the measuring tube; And
A repair structure having a flat part disposed parallel to a lower portion of the measuring tube inner flow path, and a wing part bent from both ends of the flat part to be in contact with both inner surfaces of the measuring tube; Obesity tube complex ultrasonic flow meter. The method of claim 1,
The repair structure,
And a main guide part disposed obliquely from the flat end to the bottom surface of the measuring tube to allow the fluid to be guided from the conduit into the measuring tube. The method of claim 2,
The repair structure,
And a wing guide portion disposed between the side portion of the main guide portion and the wing portion and the inner surface of the measuring tube. The method of claim 1,
The width of the flat portion is 1/2 of the inner diameter of the measuring tube,
And the wing portion is bent upward at an angle of 30 ° from both ends of the planar portion to be formed symmetrically. The method of claim 1,
The area of the flow path formed by the repair structure and the inner surface of the measuring pipe is smaller than the area of the pipe, the flow rate of the fluid introduced into the flow path of the measuring pipe from the pipe is increased. -Obesity tube complex ultrasonic flow meter. The method of claim 1,
The depth gauge is installed on the lower side of the flat portion of the repair structure, characterized in that the manhwa-obesity pipe complex ultrasonic flow meter. The method of claim 1,
And an air blower for injecting air above the repair structure is installed at the lower end of the repair structure to prevent the accumulation of deposits on the repair structure.

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