KR101602882B1 - Narrow path type area flow meter - Google Patents

Abstract

The present invention relates to a narrow path passing type area flow meter which accurately measures a flow by measuring a height of a float in a magnetostrictive system after allowing a fluid to pass a narrow path. According to the present invention, the narrow path passing type area flow meter comprises: a float which has a rectangular shape with long sides and short sides, has an inlet on one short side and an outlet on an other short side, has an inflowing space with a first width, a measuring space with a second width and an outflowing space with a third width which are sequentially disposed between the inlet and the outlet, and has the second width which is narrower than the first width and the third width; a float mounted with a permanent magnet, disposed in a measuring space of the body, and having a height which is variable in accordance with the flow; a probe bar mounted with a magnetostrictive wire, detecting a position of a float when a pulse wave is applied through the magnetostrictive wire through an insertion of the float; and a measuring part which applies a pulse to the probe bar, calculating the flow after measuring the height of the float by receiving a signal received from the float. According to the present invention, the narrow path passing type area flow meter has the effects of checking whether an appropriate amount of fluid is delivered by accurately measuring a payload of an oil tank truck at a gas station, and precisely measuring an accurate flow even when the flow of a fluid flowing in a flow meter is irregular such as a flow start and a flow stop time point, or when an amount of flow is small especially during an unloading of oil from an oil tank trunk.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an NARROW PATH TYPE AREA FLOW METER,

Field of the Invention [0002] The present invention relates to an area type flow meter, and more particularly, to a narrow passage type area flow meter capable of accurately measuring a flow rate by measuring a height of a float through a narrow passage, .

Generally, various types of flow meters used for measuring the flow rate of a liquid or a gas are used, and the area type flow meter has a structure in which a float is disposed in a fluid passage through which the fluid passes. For example, in the prior art disclosed in Korean Registered Patent Publication No. 10-0650526, there is disclosed a conventional area type flow meter in which a float is disposed in a taper pipe having an inlet port and an outlet port, Discloses a float type area type flow meter having a main body having a tapered flow path portion whose diameter is narrowed toward the lower side and whose lower end communicates with the inlet of the flow path and whose upper end communicates with the outlet of the flow path, A float which is accommodated in the flow path and moves vertically in accordance with the flow amount; and a flow sensor which is mounted on the tapered flow path portion of the main body and in which the relationship data between the distance from the float to the float and the flow amount is inputted and the position of the float is measured, And a distance measuring device for calculating and outputting the distance.

1, the oil outlet 21 of the oil tanker 20 and the inlet 31 of the underground tank 30 are connected to a hose (not shown) through a hose (not shown) The flow rate of oil flowing into the underground tank 30 can not be accurately measured because the oil stored in the oil tanker 20 is unloaded in the related art.

KR 10-0650526 B1 KR 10-2002-0006138 A

When the oil tanker unloads the oil to the underground tank of the gas station, the flow of the fluid to the flow meter is divided into the steps of 'Flow Start', 'Flow Continue' and 'Flow Stop' . In general, the flow start and flow stop points are such that the flow of the fluid flowing into the flow meter is irregular or flows in a small amount, and the flow of the fluid is continuous in the flow continuation point.

Therefore, when measuring the flow rate of the oil tanker using a conventional flow meter, the volume of the flow continuously flowing fluid can be measured to some extent, but the measurement error is very large at the flow start and flow stop points. Although an electronic flow meter is used to solve such a problem, there is a limitation that the electronic flow meter is difficult to measure when the flow of the fluid flows finely, and the price is also very high, which makes it difficult to use.

It is an object of the present invention to measure the height of a float through a narrow passage and measure the height of the float in a magnetostrictive manner to accurately measure the flow rate at the time of flow start and flow stop And to provide a narrow passage type area type flow meter that can be used.

In order to achieve the above object, the flow meter of the present invention has a rectangular parallelepiped shape having a long side and a short side, and has an inlet formed at one side and an outlet formed at the other side, and an inlet space having a first width between the inlet and the outlet, A body having a second width measurement space and a third width outlet space sequentially arranged, the second width being narrower than the first width or the third width; A float having a built-in permanent magnet and disposed in a measurement space of the body and having a variable height according to a flow rate; A probe bar for detecting the position of the float when the pulse is inserted through the magnetic field and the pulse is inserted through the magnetic field; And a measuring unit for applying a pulse to the probe bar, receiving a signal reflected from the float, measuring a height of the float, and calculating a flow rate.

The body has a pair of sidewalls formed on both inner sides of both sides so that an inflow surface is inclined inwardly and a trapezoidal step formed so that an inflow surface is inclined upward on an inner bottom surface of the both side walls to form a narrow measurement space , And a groove for disposing the probe bar is formed on the upper side of the trapezoidal step.

In addition, a wide groove for accommodating the float may be formed at the center of both side walls, and the measuring unit may include a pulse wave generating means for generating a predetermined pulse wave to apply the pulsed wave to the probe bar, A reflected wave receiving means for receiving a reflected wave signal caused by a pulse wave; and a control means for controlling the pulse wave generating means to apply a pulse wave and then analyzing a signal received through the reflected wave receiving means to calculate a float height, And calculating means for calculating and outputting the flow rate from the float height.

The narrow passage type area flowmeter according to the present invention can accurately measure the loading amount of the oil tanker in the gas station and can test the delivery of the water quantity accurately. In particular, it is possible to accurately measure the flow rate at the time of flow continuation when the oil tanker is unloaded from the oil tanker, And the flow stop point, even if the flow of the fluid to the flow meter is irregular or flows in a small amount, when the fluid passes through the narrow passage of the rectangular parallelepiped shape, the height h of the fluid rises and the accurate flow rate can be precisely measured .

In addition, when the flow meter of the present invention is applied to the unloading operation of a tanker car, it is possible to minimize the measurement error of the flow meter at the flow start and flow stop points, thereby preventing economic loss due to the measurement error.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing the concept of unloading oil in a gas tank underground in a conventional oil tanker,
FIG. 2 is a schematic view showing a concept of measuring a flow rate of a tanker car unloaded to a gas tank of a gas station using a narrow passage type area flow meter according to the present invention,
FIG. 3 is a view showing a flow rate measurement concept of the narrow passage type area type flow meter according to the present invention,
4 is a view showing a narrow passage type area type flow meter according to the present invention,
5 is a view for explaining the operation of the narrow passage type area type flow meter according to the present invention,
6A to 6C are views showing a first embodiment of a narrow passage type area type flow meter according to the present invention,
7A to 7C are views showing a second embodiment of the narrow passage type area type flow meter according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. The following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

FIG. 2 is a schematic view showing a concept of measuring a flow rate of a tanker car unloaded to a gas tank of a gas station using a narrow passage type area flow meter according to the present invention, and FIG. 3 is a schematic view showing a narrow passage type area equation 1 is a diagram showing a flow measurement concept of a flow meter.

2, a narrow passage type area flow meter 100 according to the present invention includes a hose 22a (see FIG. 2) between an oil outlet 21 of a tanker 20 and an inlet 31 of a gas station underground tank 30, And 22b so as to measure the flow rate of the oil discharged from the oil tanker 20 stopped on the ground to the underground tank 30 in a free fall manner. At this time, the height of the oil outlet 21 of the oil tanker is higher than the height of the flow meter 100 by A and the flow meter 100 is positioned higher than the inlet 31 of the underground tank by a free fall, And the flow meter 100 is capable of measuring the flow rate.

That is, when the oil is discharged from the oil tanker 20 to the underground tank 30, the flowmeter according to the present invention is inserted between the oil outlet 21 of the oil tanker and the inlet 31 of the underground tank, ), And it is possible to measure the amount of oil load while unloading the oil. At this time, the oil outlet 21 of the oil tanker is located at a higher position than the flow meter 100 of the present invention, the flow meter 100 of the present invention is positioned higher than the inlet 31 of the underground tank, So that the amount of oil load can be measured while unloading.

3 (a) shows a case where a large amount of flow is accumulated in the oil tanker 20, and FIG. 3 (b) shows an example in which the flow rate remains small in the oil tanker 20. Referring to FIG. 3, the logic for measuring the flow rate of the fluid unloaded from the oil tanker 20 according to the present invention is as follows. When the unloading is performed in a state where the fluid is filled in the oil tanker 20 as shown in FIG. The water pressure is high and the dropping distance L is large because the flow velocity is fast. Therefore, the relationship between the flow rate and the flow velocity is determined as "flow rate (Q) = flow velocity (V) / cross-sectional area (A)" as shown in the following equation. Referring to FIG. 3 (a), when the flow rate of the fluid entering the inlet is high, the flow rate is high, so that the height h of the fluid passing through the narrow passage of the rectangular parallelepiped shape is high.

On the other hand, as shown in FIG. 3 (b), when the unloading is performed in a state in which the fluid of the oil tanker car is slightly cold, the water pressure is low and the falling distance L is small because the flow velocity is slow. In this case, the relationship between the flow rate and the flow velocity is obtained by the equation "flow rate (Q) = flow velocity (V) / cross-sectional area (A)". If the flow rate of the fluid entering the inlet is low, the flow rate is low and the height h of the fluid passing through the narrow passage of the rectangular parallelepiped shape becomes low. The flow rate of the fluid passing through the narrow passage is related to the height h of the oil surface. 3, x represents the width of the flow meter 100, y represents the length of the flow meter 100, z represents the length of the flow meter 100, and d represents the diameter of the flow meter inlet 111. In FIG.

FIG. 4 is a plan view showing a narrow passage type area flow meter according to the present invention, and FIG. 5 is a side view, and FIG. 5 is a view showing the operation of the narrow passage type area meter according to the present invention Fig.

As shown in FIG. 4, the narrow passage type area flow meter 100 according to the present invention has a rectangular parallelepiped shape having a long side and a short side, in which an inlet 111 is formed at one side and an outlet 115 is formed at the other side A measuring space 110b of the first width W1 and a measuring space 110b of the second width W2 are formed between the inlet 111 and the outlet 115, 110c are sequentially arranged and the second width W2 is narrower than the first width W1 or the third width W3 and a permanent magnet 122 is embedded in the body 110a, The float 120 is disposed in the measurement space and varies in height according to the flow rate. When the float 120 is inserted and a pulsed wave is applied through the self-excited coil, the position of the float 120 is detected A probe bar 130 for applying a pulse to the probe bar 130 and a signal reflected from the float 120 to receive a signal from the float 120, After measuring the (h) consists of a measuring unit 140 for calculating the flow rate. Here, the measuring unit 140 is preferably sealed to the control box 100b and isolated from the body 100a.

Referring to FIG. 4, when the fluid flows upward and downward from the inside of the taper pipe, the taper pipe type area flow meter increases or decreases the float. The flow cross-sectional area and the flow rate of the taper pipe determined by the position of the float are proportional Therefore, the vertical movement position of the float is detected and the flow rate is measured.

2, the oil outlet 21 of the oil tanker car is connected to the inlet 111 of the flow meter through a hose 22a, and the flow meter 100 is connected to the flow- The outflow port 115 of the underground tank is connected to the inlet 31 of the underground tank and the hose 22b so that the outlet 21 of the oil tanker car is positioned higher than the flow meter 100 and the flow meter 100 is connected to the inlet 31 ).

Therefore, when the oil tanker 20 is unloaded in a natural dropping manner, the fluid path of the flow meter 100 rises along the inlet 111, the rising slope 112, and the narrow passage 110b in the form of a rectangular parallelepiped -> descending slope 114 -> outlet 115, and the fluid is radiated through the inlet 31 of the underground tank into the tank 30 maintaining the atmospheric pressure state.

The fluid flow and measurement procedure of the narrow passage type area flow meter 100 according to the present invention will be described as follows.

5A, the fluid that has first entered the inlet 111 of the flow meter 100 rises from below to the uphill slope 112 and the height of the slope 112 reaches the diameter of the inlet 111 Which is higher than 1.5 times of At this time, the fluid rises from bottom to top like the logic of the Taper tubular area flowmeter.

5 (b), the fluid passes through a narrow passage 110b in the form of a rectangular parallelepiped. The maximum cross-sectional area of the passage is a rectangular width x and a length y, Is long. That is, the cross-sectional area of the rectangle, which is the maximum cross-sectional area, is about 1.5 to 2 times larger than the cross-sectional area of the circular inlet 111.

And the rectangular parallelepipedal length z of the narrow passage 110b through which the fluid passes must be sufficient to allow the fluid to flow straight through the plane, preferably about 200 to 400 mm. The relationship between the flow rate and the flow velocity is "flow rate = flow rate / flow cross-sectional area", and the circular cross-sectional area of the flowmeter inlet 111 corresponding to the flow cross-sectional area is fixed. Therefore, when the flow rate of the fluid entering the inlet 111 is high, the flow rate is high. Therefore, the height h of the fluid passing through the narrow passage 110b in the rectangular parallelepiped shape is high and the flow rate is small when the flow rate of the fluid entering the inlet 111 is low. The height h of the fluid passing through the narrow passage 110b of the shape is low.

In the embodiment of the present invention, the height of the fluid passing through the narrow passage 110b in the form of a rectangular parallelepiped is h. That is, the height h of the fluid is determined in proportion to the flow velocity of the fluid entering the inlet 111 of the flow meter 100, and the flow cross-sectional area A is "height h of the fluid × width width w".

Calibration of the flow meter 100 can be performed by inputting a fluid having a known flow rate V into the inlet 111 of the flow meter to find the height h of the fluid proportional to the flow rate of the fluid, The height h of the fluid according to the flow rate of the fluid can be determined through experiments or calibrations at the time of calibration of the fluid.

The relation between the flow rate and the flow velocity is expressed by the equation of "flow rate (Q) = flow velocity (V) / flow cross sectional area (A)". to be.

When a fluid flows into the inlet 111 of the flowmeter, the height h of the fluid is measured to calculate the flow cross-sectional area A, and the flow velocity V according to the height h of the fluid set at the calibration is derived The flow rate (Q) can be measured according to the above relational expression.

On the other hand, in the present invention, the height h of the fluid is measured by the distance measurement method of the magnetic distortion method. That is, a float 120 in which a permanent magnet 122 is embedded is floated on the liquid level of a fluid at a midpoint of a passage 110b passing through a narrow passage of a rectangular parallelepiped shape, and a float 120 is measured by a magnetostriction- The height h of the fluid can be measured. At this time, the accuracy of the magnetic distortion type distance measuring apparatus can be set to 0.1 mm and the detection interval to 0.1 seconds. The measuring unit 140 includes a pulse wave generating unit for generating a predetermined pulse wave and applying it to the probe bar 130, a reflected wave receiving unit for receiving a reflected wave signal due to the pulse wave from the probe bar 130, And a calculation means for calculating a height of the float 120 by analyzing the signal received through the reflected wave receiving means after controlling the pulse wave generating means to apply pulse wave and calculating and outputting the flow rate from the calculated float height can do.

An example of a specific design specification according to an embodiment of the present invention is as follows. That is, when the diameter of the cylindrical inlet 111 is 80, the sectional area of the circular inlet 111 is 40 x 40 x 3.14 = 5024 mm 2, and a rectangle having the same area is 50 mm x 100.48 mm = 5024 mm 2. Therefore, since the maximum flow area A is twice as large as the sectional area of the circular inlet 111, the area of the rectangle is 50 mm in width and 200 mm in length, and the length × length × length of the rectangular parallelepiped is 50 × 200 × 300 mm. In the embodiment of the present invention, the length is set to 300 mm as an appropriate value.

The fluid then flows down through the narrow passage 110b of the rectangular parallelepiped and descends along the descending slope 114 to escape to the outlet 115.

Then, the fluid is radiated to the inside of the tank 30 which is maintained at atmospheric pressure via the inlet 31 of the underground tank.

6A is a perspective view, Fig. 6B is a side cutaway perspective view, and Fig. 6C is a cross-sectional view of a narrow passage type area flow meter according to a first embodiment of the present invention, This is an example in which a measuring section configuration is added.

6A to 6C, the first embodiment of the narrow passage type area type flow meter according to the present invention has a rectangular parallelepiped shape having a long side and a short side, in which an inlet 111 is formed at one side and an outlet And an inflow space 110a with a wide width, a measurement space 110b with a narrow width and a wide outflow space 110c with a wide width are sequentially disposed between the inflow port 111 and the outflow port 115 The float 120 includes a body 110 and a permanent magnet 122 and is disposed in a measurement space 110b of the body and has a variable height according to a flow rate. A probe bar 130 for sensing the position of the float 120 when a pulsed wave is applied through a magnetic field and a pulse is applied to the probe bar 130 and a signal reflected from the float 120 is received And measures a height of the float 120 and then calculates a flow rate 140).

6A to 6C, the body 110 includes a pair of side walls 116 each formed so as to have an inflow surface inclined inward on both sides of both sides, a trapezoidal shape formed on the inner bottom surface of both side walls such that the inflow surface is inclined upward The step 113 forms a measurement space 110b having a narrow width and a groove 113a for positioning the probe bar 130 is formed on the upper side of the step 113 of the trapezoid. And may include a cover 117 for covering the upper side of the body 110.

On the other hand, when the capacity of the flow meter is small, the flow inlet 111 of the flow meter is small. Therefore, the width of the float 120 passing through the narrow passage of the rectangular parallelepiped shape may be smaller than 40 mm. Since the outer diameter of the float 120 of the magnetostrictive distance measuring apparatus is 40 mm, in order to secure a space in which the float 120 can be installed, The embodiment can be modified as shown in Figs. 7A to 7C,

7A to 7C are perspective views of a narrow passage type area meter according to a second embodiment of the present invention, wherein FIG. 7A is a perspective view, FIG. 7B is a side cutaway perspective view, This is an example in which a measuring section configuration is added.

7A to 7C, the second embodiment of the narrow passage type area type flow meter according to the present invention is a rectangular parallelepiped shape having a long side and a short side, in which an inlet 211 is formed at one side and an outlet 211 And an inflow space 210a with a wide width, a measurement space 210b with a narrow width, and a wide outflow space 210c with a wide width are sequentially disposed between the inlet 211 and the outlet 215 A float 220 having a built-in permanent magnet and disposed in a measurement space 210b of the body and having a variable height according to a flow rate; a float 220 having a pseudo- A probe bar 230 for sensing the position of the float 220 when a pulsed wave is applied through a magnetic field, a pulse applied to the probe bar 230, a signal reflected from the float 220, 220), and then measures the flow rate, It is configured.

7A to 7C, the body 210 includes a pair of side walls 216 each formed so as to have an inflow surface inclined inwardly on the inside of both sides, a trapezoidal shape formed on the inner bottom surface of both side walls such that the inflow surface is inclined upward The step 213 forms a measurement space 210b having a narrow width and a groove 213a for positioning the probe bar 230 is formed on the upper side of the trapezoid step 213.

In addition, a wide groove 216a for accommodating the float 220 may be formed at the center of the side walls 216, respectively.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

110, 210: body 111, 211: inlet
112, 212: rising slope 113, 213: trapezoidal step
114, 214: descending slope 115, 215: outlet
116, 216: side wall 117, 217: cover
110a, 210a: inflow space 110b, 210b: measurement space
110c and 210c: measurement space

Claims (5)

Wherein the inlet port is formed at one side and the outlet port is formed at the other side, and an inlet space of the first width, a measuring space of the second width, and a third outlet space of the third width are formed between the inlet and outlet, A body disposed sequentially, the second width narrower than the first width or the third width;
A float having a built-in permanent magnet and disposed in a measurement space of the body and having a variable height according to a flow rate;
A probe bar for detecting the position of the float when the pulse is inserted through the magnetic field and the pulse is inserted through the magnetic field; And
And a measuring unit for measuring a height of the float and measuring a flow rate by applying a pulse to the probe bar and receiving a signal reflected from the float. 2. The apparatus of claim 1,
A pair of side walls formed on the inner side of both sides so as to incline the inflow surface to the inside and a trapezoidal step formed so that the inflow surface is inclined upward on the inner bottom surface of the both side walls, Passage type area type flow meter. [3] The narrow flow passage type area meter according to claim 2, wherein a groove for disposing a probe bar is formed on the upper side of the trapezoidal step. The flowmeter of claim 2, wherein grooves for receiving the float are formed at the center of both side walls. The apparatus according to claim 1, wherein the measuring unit
A pulse wave generating means for generating a predetermined pulse wave and applying it to the probe bar,
A reflected wave receiving means for receiving a reflected wave signal due to the pulse wave from the probe bar;
And calculating means for calculating the float height by analyzing the signal received through the reflected wave receiving means after controlling the pulse wave generating means to apply the pulse wave and calculating and outputting the flow rate from the calculated float height A narrow passage type area type flow meter.

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