Flow velocity measuring system and flow rate measuring system

Abstract

An object of the present invention is to provide a flow velocity measuring system in which a sensor is not in contact with water and which can measure a flow velocity of water with a simple configuration. Another object of the present invention is to provide a novel flow rate measurement system capable of measuring a flow rate of water based on the flow velocity.SOLUTION: The flow velocity measuring system includes a drainage pipe, a distance sensor, and a measuring unit, the drainage pipe being capable of discharging water from a water discharge port in a horizontal direction, the distance sensor being disposed at an arbitrary position facing the water discharge port at a horizontal distance D and a vertical distance Y from the water discharge port and being capable of detecting a horizontal distance Xo from the water discharge port to water, the measurement means is capable of measuring the flow velocity Vo of the water discharged from the water discharge port from Xo, D, Y, and the gravitational acceleration g.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a flow velocity measurement system that measures the flow velocity of water discharged from a drain pipe, and a flow rate measurement system that performs measurements based on the flow velocity. [Background technology]

[0002] Generally, the flow rate of water flowing through a drain pipe is expressed by the following formula: Flow rate Q[m 3 / s] = cross-sectional area of ​​the drain pipe A [m 2 ]×Flow velocity V[m / s] Therefore, to obtain the water flow rate, the flow velocity through the drain pipe is measured.

[0003] Known methods for measuring the flow velocity of water in a drain pipe include installing a sensor such as a hot wire or Pitot tube in the pipe and inserting the sensor directly into the water to measure the flow velocity from the physical quantities of the water. Another known method is to install a transparent window in the wall of the drain pipe and determine the movement speed of scatterers mixed in the water using an optical method such as image processing to measure the flow velocity (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-54408 [Patent Document 2] Japanese Patent Application Publication No. 8-201413 Summary of the Invention [Problem to be solved by the invention]

[0005] However, installing a sensor inside a drainage pipe poses the problem of sensor deterioration due to contact between the water and the sensor, depending on the contents of the drainage. Also, measuring flow velocity using optical techniques poses the problem of complex image processing.

[0006] Therefore, an object of the present invention is to provide a flow velocity measurement system that can measure the flow velocity of water using a simple configuration with a sensor that does not come into contact with water, and a novel flow rate measurement system that can measure the water flow rate based on the flow velocity. [Means for solving the problem]

[0007] As a result of extensive research to solve the above problems, the inventors of the present invention came to the conclusion that if the initial flow velocity of water discharged from a drain pipe's outlet could be determined using the equation of parabolic motion under gravity, it might be possible to estimate the flow rate of water discharged from the drain pipe. They then attempted to measure the flow velocity at the drain pipe's outlet by measuring the distance from the outlet to the point where the discharged water falls. As a result, the inventors finally succeeded in creating a measurement system that can easily measure flow velocity by using a distance sensor that does not contact the water. The present invention was completed based on this first successful example by the inventors of the present invention.

[0008] That is, according to each aspect of the present invention, the following embodiments are provided. [1] A flow velocity measurement system, comprising: A drain pipe, a distance sensor, and a measuring means are provided, The drain pipe is capable of discharging water from the outlet in a horizontal direction, The distance sensor is disposed at an arbitrary position facing the water outlet at a horizontal distance D and a vertical distance Y from the water outlet, and is capable of detecting a horizontal distance Xo from the water outlet; The measuring means is capable of measuring the flow velocity Vo of water discharged from the water outlet from D, Y, Xo and the gravitational acceleration g. The flow velocity measurement system. [2] The measuring means calculates the following relational expression (I) from D, Y, Xo, and g.

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[0009] According to the present invention, the flow velocity of water at the outlet of a drain pipe can be measured more easily by measuring the distance from the outlet of the drain pipe to the point where the discharged water falls, while using a simpler configuration consisting of a drain pipe, a distance sensor, and a measuring means. Furthermore, according to the present invention, it is possible to measure the flow rate based on the flow velocity. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing a configuration of a flow velocity measurement system 1 according to one embodiment of the flow velocity measurement system. [Figure 2] FIG. 2 is a block diagram showing an example of the functional configuration of the measurement means 30 of the flow velocity measurement system 1. As shown in FIG. [Figure 3]FIG. 3 is a schematic diagram showing the configuration of a flow velocity measurement system 1 according to another embodiment of the flow velocity measurement system. [Figure 4] FIG. 4 is a schematic diagram showing the configuration of a flow velocity measurement system 1 according to still another embodiment of the flow velocity measurement system. [Figure 5] FIG. 5 is a schematic configuration diagram showing a flow velocity measurement system 1 according to still another embodiment of the flow velocity measurement system. [Figure 6] FIG. 6 is a flowchart showing an example of a method for measuring flow velocity performed by the flow velocity measurement system 1. [Figure 7] FIG. 7 is a block diagram showing an example of the functional configuration of the measurement means 30 of the flow rate measurement system 2. As shown in FIG. [Figure 8] FIG. 8 is a flowchart showing an example of a method of flow rate measurement performed by the flow rate measurement system 2. As shown in FIG. [Figure 9] FIG. 9 is a graph showing an example of a scatter diagram and a regression line relating to the measured values ​​of the flow velocity Vo and the distance Xo. DETAILED DESCRIPTION OF THE INVENTION

[0011] Each aspect of the present invention will be described in detail below, but the present invention can take various forms as long as it achieves its object.

[0012] Unless otherwise specified, each term in this specification is used in the sense commonly used by those skilled in the art of water treatment and the like, and should not be construed as having an unduly limiting meaning. Furthermore, the speculations and theories made in this specification are based on the inventors' knowledge and experience to date, and therefore the present invention is not limited solely to such speculations and theories.

[0013] "Comprise," "contain," and "include" mean that elements other than those explicitly stated as included may be added (same meaning as "comprise at least"), but also encompass "consist of" and "essentially consist of." That is, "comprise" can mean including the explicitly stated elements and any one or more elements, consisting of the explicitly stated elements, or essentially consisting of the explicitly stated elements. "Have" is synonymous with "include." Elements include parts, means, ingredients, steps, conditions, parameters, and other limitations. "And / or" means any one or any or all combinations of two or more of the associated listed items. The "to" in a numerical range means a range that includes both the preceding and following numerical values, and also includes a range excluding one of the included limit values. For example, "0% to 100%" means 0% or more, 100% or less, or 0% or more and 100% or less.

[0014] Each aspect of the present invention will be described with reference to the drawings. In each drawing, elements that are less relevant to the present invention are omitted. Note that the direction indicated by the arrow UP (→UP) shown as appropriate in each drawing is the upward direction in the vertical direction.

[0015] In the flow velocity measurement system of the present invention, the unit of flow velocity is [distance / time], for example, [m / s]. In addition, in the flow rate measurement system of the present invention, the unit of flow rate is [volume / time], for example, [m 3 / s].

[0016] [Summary of the Invention] The flow velocity measurement system includes a drain pipe, a distance sensor, and a measuring means as basic elements. The flow velocity measurement system measures the flow velocity of water at the drain pipe's outlet based on the horizontal distance from the drain pipe's outlet to the point where the discharged water falls. The flow rate measurement system measures the water flow rate at the outlet based on the flow velocity measured by the flow velocity measurement system.

[0017] The inventors have investigated various methods of measuring flow velocity (flow rate measurement) that do not contact the water and are simple in construction, and have discovered that if the horizontal distance from the drain pipe outlet to the point where the water falls is known, the flow velocity of the water at the outlet can theoretically be calculated using the equation for parabolic motion under gravity.

[0018] As described above, when water is discharged from the outlet of the drain pipe, the flow rate of the water discharged from the outlet of the drain pipe is expressed by the following formula (a). Flow rate Q = Cross-sectional area A of water discharged from outlet × Flow velocity V0 (a)

[0019] The flow velocity (initial velocity) of water discharged from the outlet is calculated by using the equation of parabolic motion under gravity when water is projected horizontally from the outlet (initial velocity v0, velocity in the x-axis direction v x , velocity in the y-axis direction v y ), and since it moves at a constant uniform velocity in the x-axis direction while maintaining its initial velocity, the velocity and displacement are expressed by the following equations (b) and (c).

[0020]

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[0021] On the other hand, in the y-axis direction, since the object is in free fall motion, the velocity and displacement are expressed by the following equations (d) and (e), with the downward vertical direction being considered positive.

[0022]

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[0023] Furthermore, by substituting equation (c) into equation (e) and eliminating t, the displacement y is expressed by the following equation (f).

[0024]

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[0025] When water is projected horizontally from the outlet of a drain pipe, the horizontal displacement x from the outlet is expressed by the following equation (g), where v0 is the flow velocity of the water discharged from the outlet, y is the vertical displacement of the outlet, and g is the gravitational acceleration.

[0026]

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[0027] In this way, the flow velocity (initial velocity) of water discharged from the spout can be calculated using the equation for parabolic motion under gravity if the horizontal distance (x) from the spout to the point where the water falls is known. Similarly, not only when water is projected horizontally, but also when it is projected obliquely, the flow velocity (initial velocity) of water discharged from the spout can be calculated using the equation for parabolic motion under gravity if the horizontal distance (x) from the spout to the point where the water falls is known. Furthermore, when water is projected vertically, the flow velocity (initial velocity) of water discharged from the spout can be calculated using the equation for parabolic motion under gravity if the distance (y) from the spout to the highest point of the water discharged is known.

[0028] [First embodiment of flow velocity measurement system] One embodiment of the flow velocity measurement system of the present invention comprises a drain pipe, a distance sensor, and a measuring means, and is configured such that the water discharged from the drain pipe is projected horizontally (angle θ=0° relative to the horizontal direction).

[0029] A specific embodiment of the flow velocity measurement system will be described with reference to FIG. The flow velocity measurement system 1 includes a drain pipe 10, a distance sensor 20, and a measuring means 30. The flow velocity measurement system 1 may also include an angle sensor for measuring the inclination angle (θ) of the water discharged from the drain pipe.

[0030] The drain pipe 10 is capable of discharging water 12 from the water source 11 horizontally through the water outlet 10a. That is, the water 12 discharged from the water outlet 10a is projected horizontally.

[0031] The water 12 discharged from the outlet 10a of the drain pipe 10 may be, for example, wastewater such as domestic wastewater discharged from toilets, kitchens, bathrooms, washing machines, etc., urban wastewater, commercial facility wastewater, agricultural wastewater, industrial wastewater, sewage, rainwater, surface water, well water, tap water, etc., but is not limited to these, and may be a fluid or a fluid containing solids.

[0032] The drain pipe 10 has a hollow structure to allow water to move through it. The drain pipe 10 is not particularly limited in terms of material, diameter, length, etc., as long as it allows water to move through it. The materials for the drainage pipe 10 include, for example, plastic materials such as polytetrafluoroethylene, silicon, silicone, and rubber; metal materials such as stainless steel, titanium, and aluminum; and inorganic materials such as concrete, ceramic, and soil (such as a pit or earthen pipe simply excavated underground).

[0033] Distance sensor 20 is placed at an arbitrary position facing water outlet 10a, at a horizontal distance D and a vertical distance Y from water outlet 10a. Here, the point detected by distance sensor 20 on the parabola of water projected with water outlet 10a (the center of gravity of the cross-sectional area of ​​water discharged from the outlet) as the starting point (origin 0) is also called the drop point (X, Y). Distance sensor 20 is placed so that it can detect the horizontal distance (x-axis direction) Xo from drop point (X, Y) to distance sensor 20.

[0034] Distance D is the horizontal distance (x-axis direction) from the water outlet 10a to the distance sensor 20, and distance Xo is the horizontal distance (x-axis direction) from the drop point (X, Y) to the distance sensor 20. Furthermore, distance (D-Xo) is the horizontal distance (x-axis direction) from the start point (origin 0) to the drop point (X, Y). Distance Y is the vertical distance (y-axis direction) from the center of gravity of the cross-sectional area of ​​the water discharged from the water outlet 10a to the falling point (X, Y) (distance sensor 20). In FIG. 1, the downward vertical direction is considered positive.

[0035] The distance sensor 20 may be any device that detects the distance Xo and outputs a signal. The distance sensor 20 includes a pulsed light emitter and a pulsed light receiver selected from the group consisting of laser, LED, infrared, and ultrasonic waves. The distance sensor 20 detects the distance Xo by irradiating the surface of the water at the point where the water discharged from the water outlet 10a falls with a light beam such as a laser or ultrasonic waves, and receiving the reflected light beam or wave. For example, a time-of-flight (TOF) sensor may be used as the distance sensor.

[0036] The measuring means 30 is configured to be able to measure the flow velocity Vo of water discharged from the water outlet 10a from D, Y, Xo and the gravitational acceleration g.

[0037] Specifically, the measuring means 30 is preferably configured to be able to measure the flow velocity Vo of the water 12 discharged from the water outlet 10a from D, Y, Xo, and g based on the following relational expression (I).

[0038]

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[0039] 2, the functional configuration of the measurement means 30 includes a processing unit 310, a storage unit 320, an input / output unit 330, and may further include a display unit. Each component is connected to each other via a bus 340 so as to be able to communicate with each other.

[0040] The processing unit 310 is configured to be able to acquire, for example, the distance Xo, which is the detection value of the distance sensor 20, and the inclination angle (θ) of the water 12 discharged from the water outlet 10a, and is configured to calculate the flow velocity Vo of the water 12 discharged from the water outlet 10a using, for example, relational formula (I) by using a flow velocity measurement program.

[0041] The memory unit 320 is composed of a storage device and stores at least a flow velocity measurement program, and stores the distance Xo, which is the detection value of the distance sensor 20, the tilt angle (θ) of the water 12, etc. The flow velocity measurement program functions to calculate the flow velocity Vo of the water 12 discharged from the water outlet 10a based on the distance Xo, which is the detection value of the distance sensor 20, for example, using relational expression (I).

[0042] The input / output unit 330 is configured to be able to transmit the distance Xo, which is the detection value of the distance sensor 20, and the tilt angle (θ) of the water 12 discharged from the water outlet 10a to the processing unit 310, and also to be able to transmit the calculation results of the processing unit 310 to the display unit. The value of the tilt angle (θ) of the water 12 discharged from the water outlet 10a may be a preset tilt angle (θ) that is manually input, or may be set so that the tilt angle (θ) detected by an angle sensor or the like is automatically input.

[0043] The measurement means 30 may be, for example, a microcontroller, a single-board computer, a personal computer (notebook PC, desktop PC), a tablet terminal, a smartphone, or the like.

[0044] The distance sensor 20 and the measuring means 30 may be independently connected by wire, or may be connected wirelessly with or without a router etc. It is preferable that the distance sensor 20 and the measuring means 30 are physically separated, but they may also be configured as an integrated unit as long as they perform their respective functions.

[0045] [Second embodiment of flow velocity measurement system] The second aspect of the flow velocity measurement system of the present invention comprises a drain pipe, a distance sensor, and a measuring means, and is configured such that the water discharged from the drain pipe is obliquely projected in a direction at an angle θ (where -90°<θ<90°) relative to the horizontal direction.

[0046] A specific embodiment of the flow velocity measurement system will be described with reference to Figures 3 and 4. In Figures 3 and 4, components common to the flow velocity measurement system 1 of Figure 1 are assigned the same reference numerals. In the following, as a general rule, the flow velocity measurement system of the second embodiment will be described in terms of the differences from the flow velocity measurement system of the first embodiment, and descriptions of the parts that overlap with the flow velocity measurement system of the first embodiment will be omitted. Figure 3 shows a case where water discharged from a drain pipe is obliquely projected in a direction at an angle θ (where 0°<θ<90°) relative to the horizontal direction, and Figure 4 shows a case where water discharged from a drain pipe is obliquely projected in a direction at an angle θ (where -90°<θ<0°) relative to the horizontal direction. In Figures 3 and 4, the vertical downward direction is considered positive.

[0047] Drain pipe 10 is capable of discharging water 12 from water source 11 through water outlet 10a in a direction at an angle θ (where -90°<θ<90°) relative to the horizontal. In other words, water 12 discharged from water outlet 10a is projected obliquely in a direction at an angle θ (where -90°<θ<90°) relative to the horizontal.

[0048] The measuring means 30 is configured to be able to measure the flow velocity Vo of the water 12 discharged from the water outlet 10a from D, Y, Xo and the gravitational acceleration g.

[0049] Specifically, the measuring means 30 is preferably configured to be able to measure the flow velocity Vo of the water 12 discharged from the water outlet 10a from D, Y, Xo, and g based on the following relational expression (II).

[0050]

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[0051] The processing unit 310 of the measuring means 30 is configured to use a flow velocity measurement program to calculate the flow velocity Vo of the water 12 discharged from the water outlet 10a using, for example, relational expression (II).

[0052] [Third embodiment of flow velocity measurement system] A third aspect of the flow velocity measurement system of the present invention comprises a drain pipe, a distance sensor, and a measuring means, and is configured such that water discharged from the drain pipe is projected vertically in a direction at an angle θ (where θ = +90°) relative to the horizontal direction.

[0053] A specific embodiment of the flow velocity measurement system will be described with reference to Fig. 5. In Fig. 5, components common to the flow velocity measurement system 1 in Figs. 1, 3, and 4 are denoted by the same reference numerals. In the following, the flow velocity measurement system of the third embodiment will be described, in principle, focusing on the parts that are different from the flow velocity measurement systems of the first and second embodiments, and descriptions of parts that overlap with the flow velocity measurement systems of the first and second embodiments will be omitted.

[0054] The drain pipe 10 can discharge water 12 from a water source 11 in a vertical direction through a water outlet 10a. The water 12 discharged from the water outlet 10a is projected vertically at an angle θ=90° relative to the horizontal direction.

[0055] Distance sensor 20 is placed at an arbitrary position facing water outlet 10a, at a vertical distance Y from water outlet 10a. Here, the point detected by distance sensor 20 is also called the highest point. Distance sensor 20 is placed so that it can detect the vertical distance Yo (y-axis direction) from the highest point to distance sensor 20. In FIG. 4, the upward vertical direction is considered positive.

[0056] The measuring means 30 is configured to be able to measure the flow velocity Vo of the water discharged from the water outlet 10a from Y, Yo and the gravitational acceleration g.

[0057] Specifically, the measuring means 30 is preferably configured to be able to measure the flow velocity Vo of water discharged from the water outlet 10a from Y, Yo, and g based on the following relational expression (III).

[0058]

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[0059] The processing unit 310 of the measuring means 30 is configured to use a flow velocity measurement program to calculate the flow velocity Vo of the water 12 discharged from the water outlet 10a using, for example, relational expression (III).

[0060] [Flow velocity measurement method] An example of a method for measuring flow velocity using the flow velocity measurement system 1 of the first to third embodiments will be described with reference to the flowchart shown in FIG.

[0061] As illustrated in Figure 6, the flow velocity measurement system 1 discharges water 12 from the outlet 10a of the drain pipe 10 (S101), detects the horizontal distance X0 (x-axis) at the point of fall (X, Y) using the distance sensor 20 (S102), and detects the inclination angle (θ) of the water 12 based on the horizontal direction (x-axis) by manual input or using an angle sensor (S103). Next, the inclination angle (θ) of the water 12 is classified into patterns (S104), and when the inclination angle (θ) of the water 12 is 0°, the measurement means 30 calculates the flow velocity V0 using relational formula (I) based on the distance X0 (S105), when the inclination angle (θ) of the water 12 is -90°<θ<+90°, the measurement means 30 calculates the flow velocity V0 using relational formula (II) based on the distance X0 (S106), and when the inclination angle (θ) of the water 12 is +90°, the measurement means 30 calculates the flow velocity V0 using relational formula (III) based on the distance X0 (S107).

[0062] [Flow measurement system] A specific embodiment of the flow velocity measurement system includes the flow velocity measurement system of the present invention, and measures a flow rate based on the flow velocity measured by the flow velocity measurement system.

[0063] Here, one specific embodiment of the flow rate measurement system will be described, but a description of the configuration common to the flow rate measurement system of the present invention will be omitted.

[0064] The flow rate measurement system 2 includes a flow velocity measurement system 1, and the measurement means 30 is configured to be able to measure the flow rate Qo of water discharged from the water outlet 10a from the water flow velocity Vo obtained by the flow velocity measurement system 1 and the cross-sectional area A of the water discharged from the water outlet 10a. Here, the cross-sectional area A of the water discharged from the water outlet 10a matches the cross-sectional area of ​​the water outlet 10a when the water level of the water 12 flowing in the drain pipe 10 matches the diameter of the water outlet 10a. Furthermore, when the water level of the water 12 flowing in the drain pipe 10 is smaller than the diameter of the water outlet 10a, the cross-sectional area A of the water discharged from the water outlet 10a can be obtained by acquiring the cross-sectional area of ​​the water using an image sensor, a weight scale, or the like, and analyzing the discharge area.

[0065] Specifically, it is preferable that the measuring means 30 is configured to be able to measure the flow rate Qo of water discharged from the water outlet 10a based on the water flow velocity Vo obtained by the flow velocity measurement system 1 and the cross-sectional area A of the water discharged from the water outlet, based on the following relational equation (IV).

[0066]

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[0067] The functional configuration of the measurement means 30 includes the following components in addition to the functional configuration of the flow velocity measurement system.

[0068] As illustrated in Figure 7, the processing unit 310 is configured to be able to acquire the flow velocity Vo of the water 12 and the cross-sectional area A of the water discharged from the water outlet 10a, which are obtained by executing the flow velocity measurement program, and is configured to calculate the flow rate Q0 of the water 12 using, for example, relational equation (IV) by using the flow rate measurement program.

[0069] In addition to the flow velocity measurement program, the memory unit 320 also stores a flow rate measurement program. The memory unit 320 also stores the flow rate Vo and the cross-sectional area A of the water discharged from the water outlet 10a calculated by the processing unit 310. The flow rate measurement program functions to calculate the flow rate Qo of the water 12 discharged from the water outlet 10a, for example, using relational equation (IV) based on the flow rate Vo and cross-sectional area A obtained by the flow velocity measurement program.

[0070] The input / output unit 330 of the measuring means 30 is configured to be able to transmit the flow velocity Vo and the cross-sectional area A of the water discharged from the water outlet 10a obtained by the flow velocity measurement program to the processing unit 310. The value of the cross-sectional area A of the water outlet 10a may be the pre-measured cross-sectional area A of the outlet 10a that is manually input, or the cross-sectional area of ​​the water discharged from the outlet may be obtained using an image sensor or a weight scale, and the analyzed value of the water discharge area may be automatically input.

[0071] The processing unit 310 of the measuring means 30 may be configured to execute a program that corrects the calculated value of the flow rate Qo based on parameters such as the kinematic viscosity, density, and / or temperature of the water 12, and whether the flow is continuous or discontinuous (if it is discontinuous, the discharge interval or discharge frequency).

[0072] [Flow rate measurement method] An example of a method for measuring a flow rate by the flow rate measurement system 2 will be described with reference to the flowchart shown in FIG.

[0073] As illustrated in Figure 8, in addition to S101 to S107 performed by the flow velocity measurement system 1, the flow rate measurement system 2 manually or automatically inputs the cross-sectional area A of the water discharged from the water outlet 10a (S108), and calculates the flow rate Qo using relational equation (IV) based on the flow velocity Vo and cross-sectional area A calculated by the flow velocity measurement system 1 (S109).

[0074] To verify the reliability of the flow velocity measured by the flow velocity measurement system according to this embodiment, a distance sensor was placed opposite the water outlet at a horizontal distance X and a vertical distance Y from the outlet. The distance Xo and flow velocity Vo were measured while gradually changing the flow rate of the water being discharged from the drainpipe's outlet. The distance Xo was measured using a "Stepped Scale Series" (manufactured by Niigata Seiki Co., Ltd.), and the flow velocity Vo was measured based on the specifications of the TOPSFLO gear pump "TG-01." The measurements were confirmed using a timer and a measuring cylinder manufactured by Sanplatec Co., Ltd. The results are shown in Table 1.

[0075] [Table 1]

[0076] Based on the results in Table 1, a scatter plot (N=10) of flow velocity Vo versus distance Xo was created, and a regression line was plotted (Figure 9). In Figure 9, the horizontal axis represents flow velocity Vo, the vertical axis represents distance Xo, and the wavy line represents the regression line. The correlation coefficient was 0.987.

[0077] From the above results, the correlation coefficient of the regression line between flow velocity Vo and distance Xo was 0.987, which proves that the theoretical value based on relational equation (I) and the actual measured value agree with high accuracy. [Industrial Applicability]

[0078] The flow velocity measurement system and flow rate estimation system of one embodiment of the present invention has a sensor that is non-contact with the water and has a simple configuration, yet can measure the flow velocity of water discharged from a drainage pipe with high accuracy.In addition, it can measure the flow rate of water discharged from a drainage pipe, so it can be used, for example, for discharging water from large-scale plants. [Explanation of symbols]

[0079] 1. Flow velocity measurement system 2. Flow Measurement System 10 Drain pipe 10a Outlet 11 Water source 12 water 20 Distance Sensor 30 Measurement methods 310 Processing section 320 Storage section 330 Input / output section 340 Bus

Claims

1. 1. A flow velocity measurement system, comprising: A drain pipe, a distance sensor, and a measuring means are provided, The drain pipe is capable of discharging water from the outlet in a horizontal direction, the distance sensor is disposed at an arbitrary position facing the water outlet at a horizontal distance D and a vertical distance Y from the water outlet, and is capable of detecting a horizontal distance Xo from the water outlet; The measuring means is capable of measuring the flow velocity Vo of water discharged from the water outlet from D, Y, Xo and the gravitational acceleration g. The flow velocity measurement system.

2. The measuring means calculates the following relational expression (I) from D, Y, Xo, and g. [Equation 1] The flow velocity Vo of water discharged from the water outlet can be measured based on the above. The flow velocity measurement system of claim 1 .

3. 1. A flow velocity measurement system, comprising: A drain pipe, a distance sensor, and a measuring means are provided, The drain pipe is capable of discharging water from the water outlet in a direction at an angle θ (where −90°<θ<90°) relative to the horizontal direction, the distance sensor is disposed at an arbitrary position facing the water outlet at a horizontal distance D and a vertical distance Y from the water outlet, and is capable of detecting a horizontal distance Xo from the water outlet; The measuring means is capable of measuring the flow velocity Vo of water discharged from the water outlet from D, Y, Xo and the gravitational acceleration g. The flow velocity measurement system.

4. The measuring means calculates the following relational expression (II) from D, Y, Xo, and g. [Equation 2] The flow velocity Vo of water discharged from the water outlet can be measured based on the above. The flow velocity measurement system according to claim 3 .

5. 1. A flow velocity measurement system, comprising: A drain pipe, a distance sensor, and a measuring means are provided, The drain pipe is capable of discharging water from the water outlet in a direction at an angle θ (where θ = 90°) relative to the horizontal direction, the distance sensor is disposed at an arbitrary position facing the water outlet at a vertical distance Y from the water outlet, and is capable of detecting a vertical distance Yo from the water outlet; The measuring means is capable of measuring the flow velocity Vo of water discharged from the water outlet from Y, Yo and the gravitational acceleration g. The flow velocity measurement system.

6. The measuring means calculates the following relational expression (III) from Y, Yo, and g. [Equation 3] The flow velocity Vo of water discharged from the water outlet can be measured based on the above. The flow velocity measurement system according to claim 5 .

7. 7. The flow velocity measurement system according to claim 1, wherein the distance sensor comprises a light projector and a light receiver for emitting pulses of light selected from the group consisting of a laser, an LED, infrared light, and ultrasonic waves.

8. 1. A flow measurement system comprising: A flow velocity measurement system according to any one of claims 1 to 6, The measuring means is capable of measuring the flow rate Qo of water discharged from the water outlet from the water flow velocity Vo obtained by the flow velocity measurement system according to any one of claims 1 to 6 and the cross-sectional area A of the water discharged from the water outlet. The flow measurement system.

9. The measuring means calculates the following relational expression (IV) from Vo and A. [Equation 4] The flow rate Qo of water discharged from the water outlet can be measured based on the above. The flow measurement system of claim 8 .

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