KR101657264B1 - Ultrasonic flow meters of sewer pipe type applied multi manning's equation - Google Patents

Ultrasonic flow meters of sewer pipe type applied multi manning's equation Download PDF

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KR101657264B1
KR101657264B1 KR1020160052957A KR20160052957A KR101657264B1 KR 101657264 B1 KR101657264 B1 KR 101657264B1 KR 1020160052957 A KR1020160052957 A KR 1020160052957A KR 20160052957 A KR20160052957 A KR 20160052957A KR 101657264 B1 KR101657264 B1 KR 101657264B1
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water level
flow
equation
flow rate
amount
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Korean (ko)
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김진국
안용관
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주식회사 수인테크
김진국
안용관
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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
    • 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
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters

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  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The present invention relates to an ultrasonic flow meter of a sewer pipe type applied with a multi-Mannings equation to improve a general Mannings equation of calculating an amount of flow by a steady flow, and to overcome an inconvenience of a conventional immersion-type flow meter which requires periodic washing of a sensor on a floor accumulated with wastes. The immersion-type flow meter is conventionally used to measure a flow velocity and a water level when installed in the floor of the sewer pipe, which requires time and costs for maintenance. According to an analysis of a conventional data on the amount of flow, a correlation function between the water level and the amount of flow (flow velocity) is able to be achieved, which showed a deviation of more than 20-30% in the amount of flow in a certain water level range, when applied to the general Mannings equation. The present invention uses the Mannings equation with different slopes (S) for each water level range, to minimize a difference between an actual amount of flow and the amount of flow calculated by the multi-Mannings equation. The present invention is able to calculate the amount of flow by measuring only the water level without a sensor on the floor which requires to be washed to reduce maintenance costs by merely using the flow meter in accordance with the present invention with only about one third of the costs when compared to a conventional method.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-manning type ultrasonic flow meter,

The present invention relates to an ultrasonic flow meter for measuring a flow rate by measuring only a water level, and more particularly, to an ultrasonic flow meter using a Manning equation.

Most of submerged flowmeters used in Korea are based on ultrasonic Doppler method, which is the method of emitting ultrasound to particles in sewage and calculating the difference between the frequency at the time of launching and the frequency at which it is reflected, And the flow of particles is the same.

As for the immersion type flowmeter, various products are currently being marketed not only in domestic but also in NIVUS in Germany, MACE in Australia, GRAYLINE in Canada and the like.

As patent documents, a plurality of patents have been filed in Korea, and Korean Registration No. 10-0791319 entitled " Ultrasonic Doppler Flowmeter for Sewer Pipe "and Korea Publication No. 10-2011-0017333" Flowmeter using cross- That's an example.

On the other hand, Fig. 1 shows a submerged flowmeter. As shown in FIG. 1, the flow meter 1 installed in the sewage line for measuring the amount of the nonpoint source pollution introduced into the river and the amount of the initial pollution, as shown in FIGS. 2 and 3, The immersion type flow meter 1 installed in the bottom 2 of the pipe P2 is used to measure the flow rate and the flow rate using the flow rate and the water level measured by the water level sensor 3 and the flow rate sensor 4, Respectively.

Since the immersion type flow meter 1 installed on the bottom 2 of the pipe has basically the problem of foreign matter accumulation, a Korean Patent Registration No. 20-0323192 entitled "Flowmeter Sensor Automatic Cleaning apparatus " However, it is a reality that the installation of a cleaning nozzle does not fundamentally solve the problem of accumulation of foreign matter, so that a person must enter the manhole periodically and clean the accumulated deposits on the sensor.

As another method of measuring the flow rate, there is disclosed a technique of measuring the flow rate using only the water level, Korean Patent Publication No. 10-2007-0097233 entitled " . In addition, "Measurement of fluid flow in KS B ISO 1100-2 number - Part 2: Determination of water level - flow relationship" also shows how to calculate the flow rate by measuring only water level using Manning equation.

Specifically, the average flow velocity V can be expressed by the following equation (1).

Figure 112016041498344-pat00001

Where n is the roughness factor, S is the tube slope, and R h is the acceptance length.

Accordingly, the flow rate Q can be expressed by the following equation (2).

Figure 112016041498344-pat00002

Where A is the cross-sectional area of the circular tube or the cross-sectional area of the square tube.

In the case of a circular tube, A can be expressed by Equation (3) with reference to the following reference diagram.

[Reference diagram]

Figure 112016041498344-pat00003

Figure 112016041498344-pat00004

Here, the center angle? And the water level h are respectively expressed by the following equations (4) and (5).

Figure 112016041498344-pat00005

Figure 112016041498344-pat00006

On the other hand, in the case of the rectangular channel, A is expressed by the following equation (6).

Figure 112016041498344-pat00007

In this way, when the Manning equation, which is a normal flow velocity measurement method, is used in a general number, there is a problem that a flow error is calculated by measuring the actual flow velocity and the water level at a certain level or more.

Therefore, there is a need for a technology implementation that can effectively solve such a problem.

The present invention relates to a method and apparatus for periodically cleaning and maintaining foreign matter on a sensor at the bottom of a conduit, which is a problem of a submergible flow meter for measuring a flow rate by measuring a flow rate-water level in an existing sewer line, , And the problem of too large a flow error at a certain level or higher when using a conventional flow meter using a conventional Manning equation is solved.

The present invention relates to a flow meter for calculating a flow rate by measuring only the water level in a pipeline of an open channel or an obesity pipe state, wherein the water level is classified into n stages from L 1 to L n , It is possible to input S 1 ~S n corresponding to the water level L 1 ~ L n , which is a slope constant of Manning equation for calculating the flow rate, so that it is applied to a separate manning equation in each step, The present invention provides a sewer pipe type ultrasonic flowmeter to which a multi-manning type is applied.

According to one embodiment, the water level data can be calculated by moving averages from 1 to n seconds in order to minimize the effects of temporary hunting and peaking in the water level measurement for calculating the flow rate.

According to one embodiment, a round flow guide pipe made of stainless steel or plastic can be installed at the manhole inverter portion for eliminating the influence of the Manning-type roughness function according to each water channel condition and measuring the water level for stable fluid flow.

According to one embodiment, in order to compensate for the disadvantage that the flow rate is calculated only when the water level is measured even without the fluid flow which is a disadvantage of the flow meter using the Manning equation, the flow level is determined by measuring the flow rate, It can be understood that the fluid does not flow and stagnates if the flow switch is not operated.

Also, in the present invention, in the flow meter for measuring the flow rate by measuring only the water level, the slope S 1 is applied below the water level L 1, and the slope S 2 is applied below the water level L 2 and L 3, If the water level is between L 2 L 1 in the inclination S 1f 1f in the water level L is L 1 = S 1 and S 1f + calculated interpolation slope S 1 and S 2 in L 2 (L 1 -L 1f) ( S 2 -S 1 ) / (L 2 -L 1 ) so that the slopes S 1 and S 2 can be naturally connected without an inflection point. The present invention also provides a sewage pipe type ultrasonic flowmeter to which the multi-manning method is applied.

Since the sensor according to the present invention does not contact the fluid, the non-contact type ultrasonic water level meter does not require foreign matter accumulation and thus does not require periodic cleaning and maintenance.

In addition, since only the level sensor is used, the price can be reduced to 1/3 of that of the conventional immersion type flow meter, thereby reducing the cost of the user.

Also, it is possible to know the water level-flow rate relation for each site based on the accumulated flow data, and it is possible to use a different manning equation for each water level, Can be improved.

In addition, the conventional Manning type flow meter can solve the problem that the flow rate is calculated when only the water level is measured without the flow of the fluid.

1 shows a submerged flow meter.
Fig. 2 is a schematic view of a circular pipe provided with a deposition type flow meter.
Fig. 3 is a schematic view of a rectangular pipe provided with a deposition type flow meter.
4 is a configuration diagram of an ultrasonic flowmeter according to an embodiment of the present invention.
5A and 5B are views showing an ultrasonic flowmeter according to an embodiment of the present invention installed on a manhole having a circular channel.
6A and 6B are views showing an ultrasonic flowmeter according to an embodiment of the present invention installed on a manhole having a rectangular channel.
7 is a graph comparing the flow rate with the one-step Manning equation according to the water level to the actual flow rate.
8 is a graph comparing the flow rate with the 5-step Manning equation according to the water level to the actual flow rate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms.

The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, the terms "comprises" or "having ", and the like, are intended to specify the presence of stated features, integers, steps, operations, elements, parts, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1st Example

4 is a configuration diagram of an ultrasonic flowmeter according to an embodiment of the present invention.

4, the ultrasonic flowmeter 100 according to an embodiment of the present invention includes a controller 110, a water level meter 120, a storage unit 130, an input unit 140, an output unit 150, Switches 160, or combinations thereof.

However, it is needless to say that the components shown in FIG. 4 are not essential, so that a ultrasonic flowmeter having more or fewer components can be implemented.

Hereinafter, each component will be described.

The water level meter 120 is a means for measuring the water level of a target fluid to be measured. The water level meter 120 according to the present invention is preferably a non-contact type water level meter, though it can be classified into a contact type water level meter and a non- . The non-contact type water level meter includes, but not limited to, a radar system, a laser system, a load cell system, a nuclear system, and an ultrasonic system depending on a measurement method. Among them, the ultrasonic water level meter, which is generally used, measures the water level by measuring the propagation time from the ultrasonic sound emitted from the sound source until it returns from the measurement surface and returns.

The controller 110 is a means for controlling the operation of each of the components included in the ultrasonic flowmeter 100, and may perform various calculations or process various information.

Specifically, the control unit 110 can calculate the flow rate of the fluid to be measured by using the water level measured by the water level gauge 120. On the other hand, the water level measured by the water level meter 120 may include a meaningless value due to the influence of temporary hunting or wave height. Therefore, the controller 110 according to the embodiment can calculate the moving average of the water level from 1 to n seconds to minimize the water level.

The data measured in the immersion type flow meter of the flow rate-level measurement method (see FIG. 1) can be represented as a graph of the level-flow rate graph as shown in the graph of FIG. 7 (see the "actual flow rate" series in blue).

In this case, when the general manning equation is 0.013 and the slope S is 0.00117, the range of 0.096m to 0.104m is within ± 1.0% of the measured flow, but the deviation is -3.5% at the water level of 0.092m or less and the water level is 0.128m It can be seen that the deviation varies from -10% to -24% (see Table 1 below).

Figure 112016041498344-pat00008

In other words, it shows deviation within a certain degree in some water level sections, but it shows a deviation up to 24% after a certain water level. Thus, it can be said that it can not replace the existing type of flow rate meter.

Therefore, the control unit 110 according to an embodiment of the present invention can apply a separate manning equation for each level of the water level. For example, the water level is divided into n levels from L1 to Ln, and S, which is a tilt constant of the Manning equation for calculating the steady flow flow rate of each water level, is divided into S1 corresponding to the water levels L1 to Ln ~ Sn can be applied.

Here, n is preferably 5, but is not particularly limited, and may be more or less depending on the case. In addition, the tube slope constant values may be different from each other in the water level, and the higher the water level, the larger the tube slope constant value.

In this case, the range of the water level by each water level and the water level constant of each water level may be an arbitrary range or an arbitrary value based on the actually measured water level data.

The control unit 110 calculates the manning equation by applying the tilt constant value of the Manning equation according to the water level stored in the storage unit 130, and calculates the flow rate therefrom. The concrete calculation method will be described with reference to Equations (1) to (6), and a detailed description thereof will be omitted.

The flow rate using the Manning formula calculated by the controller 110 is shown in Table 2 below (n = 5, S = 0.0012, S = 0.0013, S = 0.0015, 0.0016 when S is L4, and 0.0017 when S is L5).

Figure 112016041498344-pat00009

As shown in Table 2, the flow rate according to an embodiment of the present invention is comparatively accurate within a range of the measured flow rate and the total water level within a range of ± 3%, which is a substitute for the immersion type flow meter for measuring the existing flow rate-water level.

If the water level-flow correlation graph is obtained by using the existing flow rate measurement data, a different manning equation is applied to each level by using only the non-contact water level meter 120, and the data obtained by measuring the existing flow rate- It is possible to measure the flow rate with a deviation within the range of.

Meanwhile, the storage unit 130 may store a control program for controlling or driving at least one configuration included in the ultrasonic flowmeter 100, and data corresponding thereto.

According to one embodiment, the storage unit 130 may store a slope constant of a manning equation for each water level and / or water level classified according to the water level, wherein the water level and / or slope constant may be input directly from the outside, May be copied from the storage medium.

The storage unit 130 may be a volatile memory, but preferably a nonvolatile memory is mainly used. Here, the non-volatile memory (NVM) is a storage device capable of continuously storing information even when power is not supplied. Examples of the storage device include a ROM, a flash memory, A storage device (e.g., a hard disk, a diskette drive, a magnetic tape), an optical disk drive, a magnetic RAM, a PRAM, and the like.

The input unit 140 may generate various types of data or information required to calculate the input data or the flow rate for the control command for controlling the operation of the ultrasonic flowmeter 100 applied by the user.

The shape of the input unit 140 may be a key pad, a dome switch, a touch pad (static pressure type or electrostatic type), a jog wheel, a jog switch, or the like.

The output unit 150 generates an output related to the visual, auditory, tactile, or the like. The output unit 150 includes a display unit for outputting information processed in the ultrasonic flowmeter 100, specifically, the flow rate calculated by the control unit 110, .

The display unit includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display, A 3D display, and an e-ink display.

The ultrasonic flowmeter 100 according to an embodiment of the present invention further includes a communication unit (not shown) to receive various data or information that can be applied from the user through the input unit 140, And outputs various data or information that can be output to the outside through the output unit 150 to a remote terminal.

Accordingly, the ultrasonic flowmeter 100 is electrically connected to a remote terminal (not shown) via at least one network through the communication unit, so that the ultrasonic flowmeter 100 and the remote terminal transmit / receive various data or information .

Second Example

As shown in Table 2, the ultrasonic flowmeter 100 according to the first embodiment described above has a deviation of ± 3% from the actually measured flow rate over the entire section even if only the non-contact water level meter 120 is used .

On the other hand, there may be a case where the flow rate deviation varies abruptly between adjacent water level steps among the flow rate variations calculated by the control unit 110. [

Concretely, as shown in Table 2, at a water level of 0.124 m, the deviation is -2.13%, and at a water level of 0.128 m, a deviation of 2.41% may occur within ± 3% or more than ± 4%.

In this case, the Manning slope constant value of any one of the adjacent water level steps in which the flow rate deviation occurs sharply is preferably corrected by the interpolation method.

That is, when the slope S1 is applied below the water level L1 and the slope S2 is applied above the water level L2, the slope S1f at the water level L1f where the water level is between L1 and L2 is obtained by interpolating the slopes S1 and S2 at L1 and L2, = S1 + (L1f-L1) (S2-S1) / (L2-L1) can be used to naturally connect the slopes S1 and S2 without inflection points.

For example, the water level L1 = 0.108m, the slope S1 = 0.00120, the flow rate deviation -0.14%, the water level L2 = 0.132m, the slope S2 = 0.00150 and the flow rate deviation 0.88% The slope in the interval can be calculated sequentially as 0.00125, 0.00130, 0.00135, 0.00140, 0.00145. The flow rate and the flow rate deviation calculated based on the above can be expressed as shown in Table 3, and it can be understood that the problem of the rapid variation of the flow rate variation is solved.

Figure 112016041498344-pat00010

Third Example

On the other hand, since the ultrasonic flowmeter 100 according to the first or second embodiment calculates the flow rate using only the water level, even if the fluid is stagnated without actually flowing the fluid and only the water level is measured, the flow rate is measured There may be a problem that can be shown as.

Accordingly, the ultrasonic flowmeter 100 according to an exemplary embodiment of the present invention may further include a flow switch 160.

The flow switch 160 may be disposed in a channel of a number of channels or an obesity pipe state in which a flow rate is to be measured, as a means for generating a switching switching signal when a pressure difference occurs due to a variation of a fluid flow.

When the control unit 110 determines that the fluid is stagnant due to the switching signal applied from the flow switch 160, the output unit 150 may indicate that there is no fluid flow or display the flow rate at 0 or not at all The above problem can be solved by the method of not doing.

Example

The ultrasonic flowmeter 100 according to an embodiment of the present invention can calculate the flow rate by measuring the water level in the channel of the open channel or the obesity channel.

FIGS. 5A and 5B are views showing a state in which the ultrasonic flowmeter according to the embodiment of the present invention is installed in a manhole having a circular channel, FIGS. 6A and 6B are views showing a state in which the ultrasonic flowmeter according to the embodiment of the present invention is installed in a manhole having a rectangular channel to be.

5a to 6b, the ultrasonic flowmeter 100 according to an embodiment of the present invention may be installed in the manhole 10. [ Reference numeral 11 denotes an inlet of the manhole 10 and reference numerals 12 and 13 denote an inlet channel and an outlet channel connected to the manhole 10 respectively and 14 denotes a flow- To the conduit (14).

According to an embodiment of the present invention, in order for the ultrasonic flow meter 100 to measure the flow rate stably, the water level meter 120 can measure the level of the guide pipe 140 extending from the inflow conduit 12.

That is, the illuminance function (or the illuminance coefficient, n) of the Manning equation is a value determined according to the kind and state of the channel, and is a manhole for eliminating the influence of the Manning's illuminance function depending on the channel state, It is preferable that a round flow guide pipe 200 made of stainless steel or plastic is installed at the inverter site.

Here, the guide pipe 200 may be tubular, and may have a shape in which a part of the area is opened as shown in FIG. 5A, where the water level meter 120 or an ultrasonic sound source may be positioned in the open direction. Accordingly, when the water level meter 120 according to the embodiment of the present invention is installed in the manhole 10, the sound emitted from the sound source at a position spaced apart from the fluid to be measured is fixed in the air so as to face the fluid .

The preferred embodiments of the present invention have been described in detail with reference to the drawings. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning, range, and equivalence of the claims are included in the scope of the present invention Should be interpreted.

1: immersion type flow meter 2: tube bottom
3: water level sensor 4: flow rate sensor
10: Manhole 11: Manhole entrance
12: inlet pipe 13: outlet pipe
14: Inverter 100: Ultrasonic flow meter
110: control unit 120: water gauge
130: storage unit 140: input unit
150: output unit 160: flow switch
200: guide tube

Claims (5)

delete delete delete delete 1. A flow meter for measuring a flow rate by measuring only a water level,
In the Manning equation applied to the water level, the slope S 1 is applied below the water level L 1 , the slope S 2 is applied below the water level L 2 to L 3 , and the slope S 1 at the water level L 1f when the water level is between L 1 and L 2 1f using S 1f = S 1 + (L 1f -L 1) (S 2 -S 1) / (L 2 -L 1) obtaining the interpolation slope S 1 and S 2 at L 1 and L 2 Wherein a multi-manning equation is applied between the slopes S 1 and S 2 without any inflection point.
KR1020160052957A 2016-04-29 2016-04-29 Ultrasonic flow meters of sewer pipe type applied multi manning's equation KR101657264B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101856186B1 (en) * 2017-12-21 2018-05-11 (주)수인테크 Hybrid radar flowmeter including ultrasonic flowmeter, and method for operating the same
CN108225244A (en) * 2017-12-29 2018-06-29 深圳市宏电技术股份有限公司 The measuring method and system of a kind of deposition thickness
KR102037873B1 (en) * 2018-06-18 2019-10-29 (주)수인테크 Multi-level input type deposition ultrasonic flowmeter
WO2021145494A1 (en) * 2020-01-17 2021-07-22 자인테크놀로지(주) Flowmeter for sewage conduit
KR102476585B1 (en) * 2022-01-06 2022-12-13 (주)동아엔지니어링 Mobile flow measurement device using weight sensor

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Publication number Priority date Publication date Assignee Title
KR20070097233A (en) * 2006-03-29 2007-10-04 엔비넷 주식회사 Palmer bowlus flumes flow meter for open channel and thereof flow measuring method
KR101029282B1 (en) * 2010-03-30 2011-04-18 한국건설기술연구원 Method for estimation of discharge using the measured stage data at the cross-sections with lateral change of roughness
KR101294338B1 (en) * 2012-05-09 2013-08-07 주식회사 씨에텍 An apparatus and management system for treating of storm water

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070097233A (en) * 2006-03-29 2007-10-04 엔비넷 주식회사 Palmer bowlus flumes flow meter for open channel and thereof flow measuring method
KR101029282B1 (en) * 2010-03-30 2011-04-18 한국건설기술연구원 Method for estimation of discharge using the measured stage data at the cross-sections with lateral change of roughness
KR101294338B1 (en) * 2012-05-09 2013-08-07 주식회사 씨에텍 An apparatus and management system for treating of storm water

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101856186B1 (en) * 2017-12-21 2018-05-11 (주)수인테크 Hybrid radar flowmeter including ultrasonic flowmeter, and method for operating the same
CN108225244A (en) * 2017-12-29 2018-06-29 深圳市宏电技术股份有限公司 The measuring method and system of a kind of deposition thickness
KR102037873B1 (en) * 2018-06-18 2019-10-29 (주)수인테크 Multi-level input type deposition ultrasonic flowmeter
WO2021145494A1 (en) * 2020-01-17 2021-07-22 자인테크놀로지(주) Flowmeter for sewage conduit
KR102476585B1 (en) * 2022-01-06 2022-12-13 (주)동아엔지니어링 Mobile flow measurement device using weight sensor

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