KR102243911B1 - Section-divided cross correlation flowmeter capable of precise measurement - Google Patents

Abstract

The present invention provides a technology capable of measuring a flow rate of a fluid even in a location where it is difficult to precisely measure a flow rate, such as a base water level, a junction, or the like, while significantly reducing the number of sensors and measuring a flow rate precisely. According to an embodiment of the present invention, a section-divided cross-correlation flowmeter capable of precise measurement comprises a water level sensor for sensing a water level of a fluid flowing along a cylindrical pipe, a flow velocity sensor for measuring flow velocity of the fluid, a pressure sensor for sensing pressure of the fluid, and a controller for calculating a flow rate of the fluid based on sensing data of the water level sensor, the flow velocity sensor, and the pressure sensor. The controller divides a value of a water level measured by the water level sensor into a preset number of fluid sections, and calculates a flow rate of an entire fluid using the flow velocity of one fluid section measured by the flow velocity sensor, and the water level and pressure of each fluid section.

Description

SECTION-DIVIDED CROSS CORRELATION FLOWMETER CAPABLE OF PRECISE MEASUREMENT}

The present invention relates to a technology installed in water and sewage pipes to detect the flow rate of fluid flowing inside the pipe, and specifically, it is possible to measure the flow rate even at locations where it is difficult to accurately measure the flow rate of the fluid such as the base water level and the confluence part, and at the same time, a sensor It relates to a technology capable of precise flow measurement while minimizing the number of.

Measuring the flow rate of a fluid flowing inside a pipe is an essential technology for designing water and sewage systems in an area through measurement of an average flow rate in an ordinary time, as well as preventing accidents such as damage to the pipe and preparing for flood or drought. Typical methods for measuring fluid flowing inside a pipe include a method that applies a volume type, a turbine type, a differential pressure type, a vortex type, an electronic type, and an ultrasonic type, and a method such as the Coriolis type, which measures the mass, and the ultrasonic method. The flow meter adopting is a measuring device that uses ultrasonic waves generated from the sensor, and has been widely applied throughout the field of measuring the amount of fluid at present.

The ultrasonic flowmeter can be installed and applied to a location where the length of the straight pipe at the front and rear ends is short, or to a valve or a curved pipe, which is an installation location that is affected by vortex, which is a form of abnormal flow that causes errors. In addition, it can measure the flow rate of all fluids (gas, liquid), and has the advantage of being easy to manufacture and install regardless of the size of the pipe.

However, in order to measure the flow rate more accurately, there is a problem that when the fluid flows irregularly, the flow velocity inside the pipe may vary depending on the water level or region, and it is difficult to reflect this.

Thus, as a conventional prior art, in Korean Patent Registration No. 10-1617652, etc., by attaching a sensor composed of an ultrasonic receiving/transmitting unit to a plurality of points, dividing each area inside the pipe and measuring the flow velocity for it, respectively, A function that calculates the flow rate multiplied by the cross-sectional area of the area is posted.

However, this type of measuring device may cause a problem in that it is impossible to measure the contact-type flow velocity of ultrasonic waves in the formation of the base water level in the pipe, for example, in a small village unit or in the early morning hours when water use is low. In addition, there is a problem that precise measurement of the flow velocity is impossible in the case of a gradient in which the surrounding confluence pipe or piping is inclined.

On the other hand, the above-described prior art is difficult to install and maintain as the number of sensors increases, and due to the nature of a sensor that performs one line measurement with a pair of receiving and receiving sites, the flow rate of the corresponding area due to a failure of one sensor The disadvantage is that it is impossible to measure the value.

Accordingly, an object of the present invention is to provide a technology for a flow meter that accurately calculates the flow rate of each area inside a pipe using a single sensor and measures a very precise flow rate without a plurality of sensors.

In addition, another object of the present invention is to provide a technique capable of accurately measuring or inferring a flow rate even when it is impossible to accurately measure a flow rate such as a base water level generation and a confluence pipe or a gradient.

In order to achieve the above objects, the flow meter of the section division cross-collation method capable of precise measurement according to an embodiment of the present invention includes a water level sensor for sensing a level of a fluid flowing along a cylindrical pipe, and a flow rate of the fluid. A flow rate sensor to measure, a pressure sensor that senses pressure from the fluid, and a control unit that calculates a flow rate of the fluid based on sensing data of the water level sensor, the flow rate sensor, and the pressure sensor, and the control unit includes: The measured water level value is divided into a predetermined number of fluid sections, and the flow rate of the entire fluid is calculated using the flow velocity of one fluid section measured by the flow rate sensor, and the water level and pressure of each fluid section.

The control unit is configured to derive the flow rate of each fluid section by inputting the water level and pressure of each fluid section to an associated function having the flow rate, water level, and pressure of the one fluid section as input values and the flow rate of each fluid section as an output value. After that, the average of the flow rates of all fluid sections is calculated as the average flow rate of the fluid, and the result of multiplying the average flow rate by the water level measured from the water level sensor and the cross-sectional area of the fluid calculated from the previously stored cross-sectional area of the pipe is calculated as the flow rate of the entire fluid. It is desirable to do it.

The association function is proportional to the pressure sensed by the pressure sensor, and a first output value that is inversely proportional to the flow velocity of the one fluid section and the center water level of each fluid section is calculated as the acceleration of the fluid, and the first output value is time. It is preferable that it is a first function that derives the result of integration as the flow velocity of each fluid section.

The correlation function is proportional to the pressure sensed by the pressure sensor, a constant set according to the density of the fluid, and a second output value in inverse proportion to the central water level of each fluid section is calculated as the acceleration of the fluid, and the second output value is It is also possible to be a second function that derives the result of integration with time as the flow velocity of each fluid section.

It is preferable that the controller calculates the flow rate of the entire fluid by applying the second function only when the level of the fluid flowing along the pipe is less than a predetermined critical level in which sensing of the flow rate sensor is impossible.

A sub-pipe having one end inserted into an end side of the pipe and having a curvature toward an upper end along a longitudinal direction and an opening portion extending so that the extending direction thereof is changed so that the other end is open toward the upper end; And a filling pack disposed in the gap between the sub-pipe and the pipe to block the fluid from being discharged from the pipe through the gap.

It is preferable that the end side of the pipe is at least one of the end side formed in the pipe by the joining of the pipe and the other pipe, and one area of the pipe in the area in which the gradient is formed when the pipe has a gradient.

It is preferable that the water level sensor, the flow rate sensor, and the pressure sensor are installed in the sub pipe.

According to the present invention, the distribution of fluid acceleration based on the water level and pressure is automatically calculated through a flow velocity distribution (Q-Curve) that can be inferred based on a flow velocity in a certain region and a correlation analysis method.

Accordingly, if only the flow rate in a specific area is measured through a single sensor, the water level is divided into a plurality of sections according to the measured values of the pressure sensor and the water level sensor, and the flow rate for each section is inferred by the above-described automatic calculation and then used. Flow can be measured very precisely. Accordingly, there is an effect of being able to measure the flow rate very precisely without a complicated configuration.

On the other hand, if the flow rate such as the base water level cannot be measured, the flow rate can be very accurately inferred by inferring the flow rate through a flow rate inference method based on the water level and pressure. There is an effect of solving the problem that it is difficult to measure the flow rate by different flow rates, so that the flow rate can be relatively accurately inferred even in an environment where general flow rate measurement is difficult.

1 is a view for explaining a flow rate measurement method using a multi-section flow rate measurement in the prior art.
Figure 2 is a view for explaining the installation structure of the flow meter of the section division cross-collation method capable of precise measurement according to an embodiment of the present invention.
3 is a view for explaining an example of a Q-Curve used to implement an embodiment of the present invention.
4 is a view for explaining an example in which a fluid section is divided according to an embodiment of the present invention.
5 and 6 are diagrams for explaining a flow in which a flow velocity of a fluid section is inferred according to the implementation of each embodiment of the present invention.
7 is a view for explaining a form in which a sub-pipe is installed according to an embodiment of the present invention.

In the following, various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for illustrative purposes, a number of specific details are disclosed to aid in an overall understanding of one or more aspects. However, it will also be appreciated by those of ordinary skill in the art that this aspect(s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. However, these aspects are illustrative and some of the various methods in the principles of the various aspects may be used, and the descriptions described are intended to include all such aspects and their equivalents.

As used herein, "embodiment", "example", "aspect", "example", etc. may not be construed as having any aspect or design described as being better or advantageous than other aspects or designs. .

In addition, the terms "comprising" and/or "comprising" mean that the corresponding feature and/or component is present, but excludes the presence or addition of one or more other features, components, and/or groups thereof. It should be understood as not doing.

In addition, terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are those commonly understood by those of ordinary skill in the art to which the present invention belongs. It has the same meaning. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the embodiments of the present invention, an ideal or excessively formal meaning Is not interpreted as.

Meanwhile, in the following description, some of the components are omitted or excessively enlarged or reduced in order to describe the functions of each component of the present invention, but the corresponding illustrated matters refer to the technical features and rights of the present invention. It will be understood that it is not intended to limit the scope.

In addition, in the following description, a plurality of drawings will be simultaneously referred to and described in order to describe one technical feature or constituent elements constituting the invention.

1 is a view for explaining a flow rate measurement method using multi-section flow velocity measurement in the conventional prior art, and FIG. 2 is an installation structure of a flow meter of a section division cross-collation method capable of precise measurement according to an embodiment of the present invention. 3 is a view for explaining an example of a Q-Curve used for implementation of an embodiment of the present invention, and FIG. 4 illustrates an example in which fluid sections are divided according to the implementation of an embodiment of the present invention. 5 and 6 are diagrams for explaining the flow in which the flow rate of one fluid section is inferred according to the implementation of each embodiment of the present invention, and FIG. 7 is a form in which a sub-pipe is installed according to an embodiment of the present invention. It is a figure for explaining.

First, referring to FIG. 1, in the prior art described above, an ultrasonic flow rate sensor is used for precise flow measurement. The ultrasonic flow sensor generates ultrasonic waves from the transmission modules 111, 112, 113, 114, 115, and the ultrasonic waves are scattered or reflected by moving fluid particles and foreign substances, and the wavelength changes due to the Doppler effect. do. At this time, when the receiving modules 101, 102, 103, 104, and 105 receive the corresponding ultrasonic wave, the flow velocity of the fluid is measured by using the changed value of the waveform of the ultrasonic wave.

Specifically, when ultrasonic waves are irradiated toward a fluid flowing inside the pipe 1, the irradiated ultrasonic waves are scattered and reflected from floating objects or bubbles in the fluid. At this time, since bubbles or fine floating objects can be seen to move at the same speed with the fluid, the flow velocity is measured according to the changed value of the wavelength (frequency) of ultrasonic waves scattered and reflected by the bubbles or floating objects.

Since the flow rate is derived by multiplying the flow rate by the cross-sectional area of the fluid, when the specification of the pipe 1 and the water level accordingly are measured, the cross-sectional area can be calculated, and the flow rate is calculated by multiplying this by the flow rate.

At this time, in the existing prior art, ultrasonic waves are generated from a plurality of ultrasonic transmission modules 111, 112, 113, 114, 115, and the receiving modules 101, 102, 103, 104, 105 receive the corresponding ultrasonic waves. do. Since the area of the pipe 1 is divided into a number, the receiving values of the transmitting modules 111, 112, 113, 114, 115 and the receiving modules 101, 102, 103, 104, 105 for each area will be different from each other. Therefore, the flow rate value according to the waveform change of each measured ultrasonic wave is determined as the flow rate of each divided area, and the determined flow rate is calculated according to each cross-sectional area to calculate and sum the flow rate of each part, or the cross-sectional area is added to the average value of the determined flow rate. The total flow rate is calculated by calculating.

However, as described above, such a conventional prior art is capable of precise measurement, but since a number of sensors must be attached, the complexity becomes very large, and the installation and maintenance are difficult. In addition, due to the characteristic of a sensor that performs one-line measurement with a pair of receiving and transmitting portions, there is a disadvantage in that it is impossible to measure the flow velocity value of a corresponding area due to a failure of one sensor.

Accordingly, the present invention provides a technology that enables measurement of a flow rate with an accuracy almost close to that of the embodiment of FIG. 1 by inferring the flow rate in a region divided into a plurality of sections through precise calculations while using a single sensor. .

Based on this, referring to FIG. 2, the flow meter of the section division cross-collation method (hereinafter referred to as the flow meter of the present invention) capable of precise measurement according to an embodiment of the present invention is a water level sensor installed inside the pipe 1 (10), characterized in that it comprises a flow rate sensor 20, a pressure sensor 30, and a control unit 40.

In the present invention, the water level sensor 10 is a non-contact type ultrasonic sensor, and calculates the water level according to the time when the transmitted ultrasonic wave is reflected by the fluid and received by the ultrasonic receiving/transmitting unit included in the water level sensor 10. In the embodiment shown in Figure 2, it performs a function of sensing the level of the fluid flowing along the cylindrical pipe (1).

The flow rate sensor 20 performs a function of sensing a flow rate of a fluid, specifically, a flow rate in a specific water level section, similar to the embodiment of FIG. 1 described above. At this time, the specific water level section is any one of the divided water level sections to be described later, and the method of determining this is the detection of a predetermined flow rate sensor 20 when the flow rate sensor 20 is installed inside the pipe 1 as shown in FIG. 2. By storing the height of the inside of the negative pipe (1) in the control unit 40 and dividing the water level sensed by the water level sensor 10 into a preset number (for example, up to 16), the fluid section according to each level When this is determined, it means comparing the water level and the height of the flow rate sensor 20 to determine a fluid section to which the flow rate detected by the flow rate sensor 20 belongs, and storing the flow rate of the fluid section as the measured flow rate.

At this time, when measuring the flow velocity, as a sensor capable of more precise measurement than the Doppler type ultrasonic sensor, the flow velocity sensor 20 in the present invention may be a sensor for measuring the flow velocity of an ultrasonic correlation method.

In the case of the Doppler method, the difference in frequency between the transmitted ultrasonic wave and the received ultrasonic wave due to reflection and scattering by particles in the fluid is assumed to be the flow velocity of the fluid. However, the cross-correlation method of the present invention uses a method of measuring a flow velocity according to a change value of an ultrasonic frequency using reflection of a line or plane as a group of a plurality of particles.

In this case, specifically, two types of ultrasonic sensor units may be installed in the flow rate sensor 20. One ultrasonic sensor unit irradiates ultrasonic waves in a direction opposite to the flow of the fluid, and the other ultrasonic sensor unit irradiates ultrasonic waves in the flow direction of the fluid. Therefore, each flow velocity value is measured and the average value thereof is determined as the final flow velocity. In addition, since each of the ultrasonic sensor units is set and installed in an inclined direction rather than a vertical direction with respect to the flow of the fluid, the range of the transceiving area of ultrasonic waves can be widened. In other words, since the moving measurement range of the foreign matter can be set wide, the flow velocity of the foreign matter in the unit of a line or a certain plane is measured. Specifically, by measuring the velocity of the particles in a plane, there is an advantage that it is not limited to a single particle, and thus a more precise measurement of the flow velocity is possible.

On the other hand, the pressure sensor 30 is a sensor that measures the pressure applied from the fluid according to the flow of the fluid, and at this time, the pressure sensor 30 is installed singly in one area, and is specified by the same principle as the flow rate sensor 20 described above. The pressure in the fluid section is measured, and the pressure for each fluid section is inferred using the measured pressure and water level, and can be used for the flow rate calculation described later, or it can be used for the flow rate calculation described later by inferring a constant value regardless of the water level.

The control unit 40 performs a function of calculating the flow rate of the fluid based on sensing data of the water level sensor 10, the flow rate sensor 20, and the pressure sensor 30 described above. Specifically, as shown in FIG. 2, after setting the fluid area h into a preset number of fluid areas hn according to the water level value measured from the water level sensor 10, the flow rate sensor 20 The flow rate of the entire fluid is calculated using the flow rate of one fluid section measured from and the water level and pressure of each fluid section.

The calculation method used at this time is an association function meaning the Q curve (flow rate function) of FIG. 3. For this, referring to FIGS. 3 and 4, the flow rate Q can be inferred as a curve value having a constant curvature according to the water level H in the pipe 1 under the same flow rate and pressure.

In the present invention, a single sensor is used to calculate flow rates (V1 to V8, Vh1 to Vhn in FIG. 2) in a plurality of fluid sections (h1 to h8) as shown in Figs. After deriving (Vt), the cross-sectional area of the fluid according to the measured water level is calculated using the water level and the predetermined cross-sectional area of the pipe 1 as the flow rate value, and the average flow rate multiplied by the fluid cross-sectional area is calculated as the flow rate. .

At this time, as described above, in the present invention, it has been described that the water level is divided into eight sections to set eight fluid sections, and the following description will also be described based on eight sections. However, depending on the specifications and precision requirements of the pipe 1, for example, a fluid section may be set to a maximum of 16 sections.

If described based on these contents, the controller 40 calculates the fluid by performing the above-described details in detail. Specifically, the flow rate is measured in one fluid section, that is, the water level at which the flow rate sensor 20 is located. The flow rate of each fluid section is derived by inputting the water level and pressure of each fluid section to an associated function having the flow rate, water level, and pressure of the corresponding fluid section as input values and the flow rate of each fluid section as an output value. After that, the average of the flow rates of all fluid sections is calculated as the average flow rate of the fluid, and the result of multiplying the average flow rate by the water level measured from the water level sensor and the cross-sectional area of the fluid calculated from the previously stored cross-sectional area of the pipe is calculated as the flow rate of the entire fluid. do.

That is, in the conventional prior art such as the embodiment of FIG. 1, the flow velocity of each fluid section is directly measured using a plurality of sensors, but in the present invention, the water level sensor 10 is used as described above by using an association function. The fluid section is set according to the measured water level, the pressure is measured using a single sensor such as the pressure sensor 30, which is simple to install, and the flow rate is directly measured from the flow rate sensor 20 according to each level and pressure. The flow rate of each fluid section is calculated according to the flow rate of the section, and the flow rate of the entire fluid is measured very accurately.

At this time, the related function is a general case, that is, when the flow rate sensor 20 is deposited in the fluid according to the water level by the flow rate sensor 20 as described above, so that the flow rate can be measured, and the water level is less than the base water level, that is, a certain level. Therefore, when the flow rate sensor 20 is not settled in the fluid according to the water level by the flow rate sensor 20, and thus it is impossible to measure the flow rate, each means a different function.

The first function of the former is proportional to the pressure (P) sensed from the pressure sensor 30 as shown in FIG. 5, and the flow velocity (Vg) of one fluid section measured from the flow rate sensor 20 and each fluid section The first output value (P/f(Vg) x hn) that is inversely proportional to the central water level (hn) of is calculated as the acceleration of the fluid, and the result of integrating the first output value with time is derived as the flow velocity (Vn) of each fluid section. It is a function to do.

In general, in a fluid-related function, the fluid acceleration (g) is calculated as g = P/ρH, where P is the pressure and H is the water level (height from the lowest surface of the fluid). Using this, but the flow velocity (Vg) of one fluid section is a state in which the pressure and water level in the fluid section are determined by using the above-described association function, so the constant ρ can be calculated by inverse computation of the association function. By applying it to the function of calculating the acceleration of the fluid, it is possible to derive the first function among the related functions.

If only the flow velocity in one fluid section is measured using this, the flow velocity in the remaining fluid section can be calculated relatively very accurately, and the total flow rate can be calculated using the average value and water level thereof.

On the other hand, when the latter second function, that is, the flow rate cannot be measured, the flow rate of the fluid is inferred by using the second function as shown in FIG. 6 only with the water level and pressure.

That is, the second function is proportional to the pressure P sensed from the pressure sensor 30, as shown in FIG. 6, a constant ρ set according to the density of the fluid, and a second function that is inversely proportional to the central water level of each fluid section. 2 The output value (P/ρhn) is calculated as the acceleration of the fluid, and it is a function that derives the result of integrating the second output value by time as the flow velocity (Vn) of each fluid section.

When the flow velocity cannot be measured, the Q curve and the association function of FIG. 3 are used, but in the case of density, if the inferred density value for the fluid is set, the flow velocity in each fluid section can be inferred relatively accurately. After inferring the flow rate of each fluid section by using, the flow rate is calculated through the same process as the first function described above.

In the early morning hours when water use is low or in a small village unit, a situation where it is impossible to measure the flow rate occurs due to the formation of the base water level in the building.In the case of the second function, when a value below the water level critical point where the flow rate cannot be measured is measured, mutually It is a function corresponding to the embodiment in which the flow velocity value is automatically replaced by an analogy operation value using an association analysis method.

That is, the control unit 40 does not apply the above-described first function and the second function in combination, and only when the level of the fluid flowing along the pipe 1 is less than a preset critical level in which sensing of the flow rate sensor 20 is impossible. , It is to calculate the flow rate of the entire fluid by applying the second function.

On the other hand, in the present invention, the flow rate is calculated using the water level sensor 10 for measuring the water level. In this case, it is an element that interferes with the measurement of the flow rate, and in particular, it is difficult to sense the water level. For example, if a confluence pipe exists around the periphery as shown in FIG. 7 or a slope, which is an inclined pipe, is located, the water level is not accurately maintained due to the confluence pipe and the gradient, and thus accurate water level measurement may not be possible. .

In order to prepare for such a case, the flow meter of the present invention may further include a sub pipe 50 and a filling bag 60 as shown in FIG. 7.

As shown in FIG. 7, the sub pipe 50 has a curvature such that one end 51 is inserted into the end side of the pipe 1 and faces upward along the length direction, that is, it is gently bent and the extension direction thereof. It is extended to change to the upper side and the other end 52 refers to a pipe having an opening portion opened toward the upper side. In addition, since the diameters of the pipes 1 will be different from each other, it is arranged in the gap between the sub pipe 50 and the pipe 1, so that the fluid flowing through the pipe 1 only flows through the sub pipe 50, so that the flow rate is accurate. In order to enable sensing, the filling bag 60 is disposed in the gap between the sub pipe 50 and the pipe 1 as shown in FIG. 7 to block the fluid from being discharged from the pipe 1 through the gap. Performs a function.

That is, the short side of the above-described pipe 1 in which the sub-pipe 50 is installed means an area where water level measurement is impossible, and as described above, the pipe 1 and other pipes are joined together to form the pipe 1. When a gradient B is formed on the formed end A and the pipe 1, it is at least one of the areas of the pipe in the area where the gradient B is formed.

In this case, since the pipe joined by the sub pipe 50 or the fluid flowing from the gradient B does not flow into the pipe 1, the water level will not fluctuate and will be stably held in the sub pipe 50, An arbitrary full pipe is formed in the sub pipe 50 so that the flow rate can be stably measured.

In order to measure such a stable flow rate, each sensor will have to be installed in the sub-pipe 50. That is, when the sub pipe 50 is inserted, it is preferable that the water level sensor 11, the flow rate sensor 21, and the pressure sensor 31 are installed in the sub pipe. That is, in a general case, the installation type will be the same as the embodiment of FIG. 2, but when the sub pipe 50 is inserted, the embodiment of FIG. 2 will not be implemented, and the water level sensor described above in the sub pipe 50 itself (11), the flow rate sensor 21 and the pressure sensor 31 is installed in the form of the sub-pipe 50 is manufactured, it is preferable to measure the flow rate by inserting it into the pipe (1).

According to the present invention, a single sensor is used, but the flow rate of each fluid section divided according to the water level is accurately calculated using the above-described association function, and through this, the total flow rate can be measured very precisely. have.

In particular, when the flow rate is less than the critical water level (e.g., 1.7 cm) such as the base water level, or even in the section where it is difficult to measure the water level accurately due to the formation of a confluence pipe or a gradient, very accurate measurement is possible, and very efficient flow measurement is possible. It has a possible effect.

As described above, although the embodiments have been described by the limited embodiments and drawings, those of ordinary skill in the art will understand that various modifications and variations are possible from the above description. The terms such as "include", "comprise" or "have" described above mean that components without a description to the contrary may be included, and thus other components are not excluded. It should be construed as more inclusive. In addition, the scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (8)

A water level sensor that senses the level of a fluid flowing along a cylindrical pipe, a flow rate sensor that measures a flow rate of a fluid, a pressure sensor that senses a pressure from the fluid, and sensing data of the water level sensor, a flow rate sensor, and a pressure sensor. It includes a control unit that calculates the flow rate of the fluid based on,
The control unit,
The water level value measured from the water level sensor is divided into a preset number of fluid sections, and the flow rate of the entire fluid is calculated using the flow rate of one fluid section measured from the flow rate sensor, and the water level and pressure of each fluid section,
The control unit,
After deriving the flow rate of each fluid section by inputting the water level and pressure of each fluid section to the associated function having the flow rate, water level, and pressure of one fluid section as input values and the flow rate of each fluid section as an output value, all fluids The average of the flow rates in the section is calculated as the average flow rate of the fluid, and the result of multiplying the average flow rate by the cross-sectional area of the fluid calculated from the water level measured from the water level sensor and the cross-sectional area of a previously stored pipe is calculated as the flow rate of the entire fluid,
The association function,
A first output value that is proportional to the pressure sensed by the pressure sensor and inversely proportional to the flow velocity of the one fluid section and the center water level of each fluid section is calculated as the acceleration of the fluid, and the result of integrating the first output value with time is each A flow meter of section division cross collation method capable of precise measurement, characterized in that it is a first function derived from the flow velocity of a fluid section.
delete delete The method of claim 1,
The association function,
A second output value that is proportional to the pressure sensed from the pressure sensor and inversely proportional to the central water level of each fluid section and a constant set according to the density of the fluid is calculated as the acceleration of the fluid, and the result of integrating the second output value with time Is a second function that derives as the flow rate of each fluid section,
The control unit,
Section division cross capable of precise measurement, characterized in that the flow rate of the entire fluid is calculated by applying the second function only when the level of the fluid flowing along the pipe is less than a preset critical level in which sensing by the flow rate sensor is impossible. Collation type flow meter.
delete The method of claim 1,
A sub-pipe having one end inserted into an end side of the pipe and having a curvature toward an upper end along a longitudinal direction and an opening portion extending so that the extending direction thereof is changed so that the other end is open toward the upper end; And
And a filling pack disposed in a gap between the sub-pipe and the pipe to block fluid from being discharged from the pipe through the gap.
The method of claim 6,
The end of the pipe,
A section-division cross-collation method capable of precise measurement, characterized in that it is at least one of the one side of the pipe formed in the pipe and the pipe in the case where a gradient is formed in the pipe when the pipe and other pipes are joined. Flow meter.
The method of claim 6,
The water level sensor, the flow rate sensor, and the pressure sensor are installed in the sub-pipe.

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