JP2005241343A - Apparatus for measuring fluid in pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for measuring a fluid in a pipe, which can directly measure various quantities of the fluid flowing in the pipe. <P>SOLUTION: A transmitter 3 is floated in the fluid in the pipe line 1. A receiver 4 is provided at a ceiling part in the pipe line 1. A radio wave transmitted from the transmitter 3 moving with the flow of the fluid is received by the receiver 4. An arithmetic mean 50 is provided, which obtains the distance from the receiver 4 to the transmitter 3, according to the intensity of the radio wave measured by the receiver 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an in-pipe fluid measuring device capable of measuring the level, flow rate, flow rate, and the like of a fluid such as sewage and factory wastewater flowing in a pipeline such as a main sewer.

  Fluid such as sewage and factory wastewater flows in pipes such as the main sewer. It is desirable that the fluid level, the flow velocity, and the flow rate of the fluid flowing in such a pipe line (hereinafter described as an example of a main sewer) can be measured.

  In general, for sewerage control, the amount of rainwater inflow into a rainwater drainage facility discharged into a river by multiple rainwater pumps is predicted, and support information on operation of rainwater pumps and inflow gates at pumping facilities is provided to operators. Or, rainwater pump operation and inflow gate operation are automatically controlled. In order to perform such control, it is convenient if the flow rate of the fluid flowing into the sewer can be directly measured.

  Conventionally, as means for directly measuring the flow rate of fluid, there are an electromagnetic flow meter, an ultrasonic flow meter, a cough flow meter, and the like. However, it was practically difficult to install many measuring instruments in a large main sewer with a large pipe diameter due to the cost of installation at multiple points and problems in maintenance. That is, it is difficult to directly know the amount of rainwater and the behavior of rainwater in the main line using such an instrument.

  There is also package software that simulates the behavior of fluid in the inflow trunk line, but it is necessary to set many items such as trunk line civil engineering data, land use status data, etc. It is the use of.

As a prediction technology, rain radar, trunk water level meter / flow meter, ground rain gauge, etc. are used to predict the amount of rainwater inflow to the pump station or the amount of rainwater stored in the trunk line. Support for driving pumps and inflow gates is also performed (see, for example, Patent Documents 1 and 2). However, due to problems such as the prediction cycle and accuracy, the actual situation is that it has not been applied to rainwater pump control and inflow gate operation.
Japanese Patent Laid-Open No. 5-128092 Japanese Patent Laid-Open No. 11-22650

  In this way, it is difficult to directly measure the fluid flow rate with a flow meter in a large-diameter and wide-area main sewer, and it is common to make predictions based on rainfall, etc. There was a problem to be improved in terms of accuracy.

  An object of the present invention is to provide an in-pipe fluid measuring device capable of directly measuring various amounts of fluid flowing in the pipe.

  An in-pipe fluid measuring device according to the present invention includes a transmitter suspended in a fluid in a pipe and a radio wave transmitted from the transmitter that is provided on the ceiling in the pipe and moves along with the flow of the fluid. It is characterized by comprising a receiver for receiving ultrasonic waves, and a calculation means for obtaining a distance from the receiver to the transmitter based on the intensity of radio waves or ultrasonic waves measured by the receiver.

  In the present invention, the receiver has a function of measuring the intensity and frequency of the radio wave or ultrasonic wave transmitted from the transmitter, and the calculation means is the first transmitter to the first transmitter position at a certain time. And a second distance d2 to the second transmitter position after a predetermined time, respectively, and the first and second distances d1 and d2, received radio waves from the first transmitter position, or From the ultrasonic frequency Fi, the difference ΔF between the reception frequency Fi and the known transmission frequency Fo, the transmitted radio wave or ultrasonic velocity c, and the predetermined time value Δt, a virtual line in the first distance direction And an arithmetic function for obtaining an angle θ between the fluid and the fluid surface.

  In the present invention, the calculation means includes the frequency Fi of the received radio wave or ultrasonic wave from the first transmitter position, the difference ΔF between the received frequency Fi and the known transmission frequency Fo, the transmitted radio wave or ultrasonic wave. And a calculation function for obtaining the moving speed Vp of the transmitter from the cosine angle cosθ by the angle θ between the imaginary line in the first distance direction and the fluid surface.

  Further, in the present invention, the calculation means is configured to receive fluid from a receiver installed on the ceiling in the pipeline from the sine angle sinθ by the angle θ between the virtual line in the first distance direction and the fluid surface and the first distance d1. It has a calculation function for obtaining the distance Δh to the surface and obtaining the fluid surface height h from the distance Δh and the vertical height in the pipe.

  In the present invention, the computing means obtains the fluid cross-sectional area S from the fluid surface height h in the pipe and the civil engineering data relating to the shape and dimension of the pipe obtained in advance. It has a calculation function for obtaining the fluid flow rate Q from the fluid flow velocity based on the moving speed Vp of the transmitter.

  In the present invention, the receiver is provided at each of a plurality of locations along the flow direction of the pipeline, and the calculation means calculates each point based on the values measured by each of these receivers.

  Moreover, in this invention, the calculating means has each calculated | required the surface height, flow velocity, and flow volume of the fluid in each point in which the receiver was provided.

  Further, the present invention includes appropriate value determining means for comparing the values of the respective points obtained by the calculating means with each other to determine whether or not the values of the respective points are appropriate.

  Further, the present invention includes fluid quantity calculation means for obtaining the fluid quantity in the pipe line from the values of the respective points obtained by the calculation means and the civil engineering data relating to the shape and dimensions of the pipe line.

  Further, the present invention has an inflow amount calculating means for calculating the fluid inflow amount into the pipe line by taking the difference in the fluid amount at each time.

  In the present invention, a plurality of transmitters are prepared, and are sequentially inserted into the pipe line from the upstream side of the pipe line at regular intervals.

  Further, in the present invention, the pipe line is a sewage pipe into which rainwater flows, and the transmitter is inserted only during the duration of rainfall based on the rainfall signal or weather data from the rain gauge.

  Moreover, in this invention, it has a monitoring apparatus which displays each value calculated | required by the calculating means and various calculation means.

  In the present invention, the monitoring device graphically displays the fluid surface state in the pipe line based on the value of the fluid surface height obtained by the computing means.

  Also, in the present invention, appropriate values for the inflow gate and the pump are compared by comparing each value of the fluid in the pipe obtained by the calculation means with the operation status of the inflow gate and the pump connected to the pipe. Is output to the monitoring device.

  Further, the present invention includes a Web server that displays information output to and displayed on the monitoring device on a Web browser.

  The present invention further includes an external display unit that displays information output to and displayed on the monitoring device on an external terminal.

  Further, in the present invention, the control command for the inflow gate and the pump is obtained by comparing each value of the fluid in the pipe obtained by the calculation means with the operation status of the inflow gate and the pump connected to the pipe. Control output means for outputting is provided.

  According to the present invention, a transmitter is suspended in a fluid in a pipeline, and a receiver is provided on a ceiling portion in the pipeline. By this receiver, radio waves or ultrasonic waves from the transmitter moving with the flow of the fluid are provided. By receiving this, it is possible to directly measure various quantities relating to the fluid flowing in the pipeline.

  Hereinafter, an embodiment of an in-pipe fluid measuring apparatus according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows the basic configuration of this embodiment. In FIG. 1, reference numeral 1 denotes, for example, a pipeline forming a sewer main line or the like (hereinafter, described as a sewer main line), and fluid such as sewage including rainwater and factory wastewater flows therein. This fluid flows into a pumping station (not shown) located on the downstream side, and is discharged to a discharge destination (river or the like) by a rainwater pump 10 provided in the pumping station. An inflow branch line 2 is connected to an intermediate portion of the trunk line 1 and sewage flows in the middle.

  Reference numeral 3 denotes a transmitter, which has a predetermined output (strength) Wo and a predetermined frequency Fo, and includes radio waves or ultrasonic waves including an identification signal for each transmitter 3 (hereinafter, only the radio waves will be described, but the present invention also includes ultrasonic waves). To send. A large number of the transmitters 3 are prepared, and are sequentially inserted into the main line 1 at intervals by an input mechanism 7 provided on the upstream side of the main line 1. These transmitters 3 float on the fluid in the main line 1 and move downstream as the fluid flows.

  Reference numeral 4 denotes a receiver, which is provided on the ceiling (at the top of the inner surface when the cross section of the main line 1 is circular) at a plurality of locations along the fluid flow direction in the main line 1. Each of these receivers 4 receives a radio wave from each transmitter 3 that floats and moves on the fluid, and measures a signal input (strength) Wi and a reception frequency Fi for each transmitter 3.

  A process controller 5 receives a measurement signal from the receiver 4 and a measurement signal from the rain gauge 12 and performs a predetermined calculation. And the information in the inflow trunk line obtained by the calculation is sent to the driving support device 6 through the transmission line 9 to provide the operator with the information, or the rainwater pump 10 of the pump station is based on the calculated values. In addition, a control signal for the inflow gate 11 is output.

  As shown in FIG. 2, the process controller 5 includes a calculation unit 50, an appropriate value determination unit 51, a fluid amount calculation unit 52, an inflow amount calculation unit 53, a guidance output unit 54, and a control output unit 55.

  The calculation means 50 includes the received signal 40 measured by the receiver 4 and known civil engineering data relating to the inflow trunk line 1 held in the process controller 5 (the cross-sectional shape of the pipe, the pipe diameter, the pipe bottom at each point of the inflow trunk line) Based on the data 56 indicating the height, etc., the surface height (hereinafter described as water level), the flow velocity / flow rate, etc. of the fluid at a plurality of points in the inflow trunk line 1 are calculated.

  A calculation flow of the calculation means 50 is shown in FIG. As shown in FIG. 3, a signal output Wo of a radio wave transmitted from the transmitter 3 and a transmission frequency Fo are set in the calculation unit 50 as known data. In addition, as a received signal 40 from the receiver 4, a received radio wave signal input Wi and a received frequency Fi are input.

  Then, by using the signal output Wo of the radio wave transmitted from the transmitter 3 and the signal input Wi by the receiver 4, the distance d from the receiver 4 to the transmitter shown in FIG. Ask.

  In the first calculation 501, the distance d from the receiver 4 to the transmitter 3 is determined based on the strength of the received radio wave by using the characteristic that the radio wave transmitted from the transmitter 3 is attenuated before reaching the receiver 4. calculate. Usually, the wave is attenuated in inverse proportion to the nth power of the distance, so the following equation is established.

Wi / Wo = k · d ⁻ⁿ (1)
In the formula (1), k is a constant.

  Solving this for d gives

d = (k · Wo / Wi) ^{1 / n} (2)
Here, n is a constant given according to the environment, but it is necessary to reflect the characteristic in the inflow trunk line 1 in an arithmetic expression in advance.

  Further, a calculation using the Doppler effect is performed by the second calculation 502 using the transmission frequency Fo and the reception frequency Fi of the radio wave.

  In the second calculation 502, the principle of the Doppler effect is used, and the moving speed (surface flow velocity) Vp of the transmitter 3 is calculated by the following equation based on the difference between the transmission frequency from the transmitter 3 and the reception frequency at the receiver 4. Calculate with

Vp = {ΔF / (Fi · cos θ)} · c (3)
In equation (3), Fi: reception frequency, ΔF: frequency difference (= Fi−Fo), c: velocity of transmitted radio wave, θ: horizontal plane (fluid surface) and transmitter 3 -receiver 4 are connected. This is the angle formed with the virtual line (in the direction of distance d). The angle θ is determined by a third calculation described later.

  Equation (3) is derived as follows. That is, when the transmitter 3 approaches the fixed receiver 4, assuming that the transmission frequency of the transmitter 3 is Fo, the moving speed of the transmitter 3 is Vp, and the radio wave speed is c, the receiver 4 actually The frequency Fi received by is obtained by the following equation.

Fi = Fo · c / (c−Vp · cos θ)
∴Fi ・ c-Fi ・ Vp ・ cosθ = Fo ・ c
∴Fi ・ Vp ・ cosθ = Fi ・ c−Fo ・ c
If Fi−Fo = ΔF, Vp is obtained as follows.

∴Fi ・ Vp ・ cosθ = ΔF ・ c
∴Vp = {ΔF / (Fi · cosθ)} · c
Using the calculation results of the first calculation 501 and the second calculation 502 and the known civil engineering data 56, the position L and the water level h of the transmitter 3 are obtained by the third calculation 503.

  In the third calculation 503, from the distance d to the transmitter 3, the moving speed (surface flow velocity) Vp of the transmitter 3 and civil engineering data (pipe bottom height) shown in FIG. The water level h is calculated by the following method, for example.

  As shown in FIG. 5, it is assumed that the distance to the transmitter 3 at a certain time t is measured as d1. Also assume that the distance to the transmitter at time t + Δt (Δt is a minute time) is measured as d2. Assuming a minute time, it can be considered that the transmitter 3 moves while maintaining its water level at the moving speed (surface flow velocity) Vp of the transmitter 3 measured at a certain time t. At this time, d1, d2, and Vp · Δt are three sides, and θ satisfying the relationship as shown in FIG. 5 can be obtained using the following cosine theorem.

A ² = B ² + C ² −2 · B · C · cos θ (4)
The equation (4) is solved by substituting A = d2, B = d1, and C = Vp · Δt. As a result of substitution, the following formula is obtained.

d2 ² = d1 ² + [{ΔF / (Fi · cos θ)} · c · Δt] ² −2 · d1
{ΔF / (Fi · cosθ)} · c · Δt · cosθ (5)
Equation (5) is solved for cos θ.

[{ΔF / (Fi · cos θ)} · c · Δt] ² = d2 ² −d1 ²
+ 2 · d1 · (ΔF · c · Δt / Fi)
∴ (ΔF · c · Δt / Fi) ² · (1 / cos θ) ² =
d2 ² −d1 ² + 2 · d1 · (ΔF · c · Δt / Fi)
∴ (1 / cosθ) ² = {d2 ² −d1 ² + 2 · d1 ·
(ΔF · c · Δt / Fi)} / (ΔF · c · Δt / Fi) ²
∴cos ² θ = (ΔF · c · Δt / Fi) ² / {d2 ² −d1 ² +
2 · d1 · ΔF · c · Δt / Fi)}
∴cos θ = ± [(ΔF · c · Δt / Fi) ² / {d2 ² −d1 ² +
2 · d1 · ΔF · c · Δt / Fi)}] ^1/2 (6)
In (6), on the right side, all the variables d2, d1, c, Fi, ΔF, and Δt are known values, and cos θ can be obtained by this equation (6). Note that the composite (±) on the right side of Equation (6) corresponds to + when the transmitter 3 is upstream of the position of the receiver 4 and − when it is downstream.

Then, by this θ, the moving speed (fluid surface speed) Vp of the transmitter 3, the distance Δh (= d · sin θ) between the fluid surface and the ceiling surface of the trunk line 1, and the horizontal distance ΔL ( = D · cos θ). As a result, the point L of the transmitter 3 is a point that is a distance ΔL in the horizontal direction from the receiver 4. Then, the water level h at the position of the transmitter 3 is obtained from the pipe bottom height h _B at the position L of the transmitter 3, the pipe top height h _{T at} the position of the receiver 4, and Δh.

  Next, the cross-sectional area S of the fluid flowing through the trunk line 1 is obtained by the fourth calculation 504 using the values obtained by the above calculation and the civil engineering data 56.

  In the fourth calculation 504, the cross-sectional area S at that point is calculated from the water level h and civil engineering data (tube shape, tube diameter). For example, as shown in FIG. 6, when the main line 1 is a circular pipe having a pipe diameter D, the cross-sectional area S of the fluid at the water level h is obtained by the following equation.

S = (1/8) × (φ−sinφ) · D ² (7)
Here, D: the pipe diameter at the point L, and φ: the central angle (determined from the pipe diameter and the water level).

  That is, as shown in FIG. 6A, if the water level is equal to or less than the center of the tube, the central angle φ is 2 and the length of the two sides is D / 2, and the central angle φ is 2 The cross-sectional area S of the fluid can be obtained by subtracting the area of an isosceles triangle whose side length is D / 2. Further, as shown in FIG. 6 (b), if the water level is equal to or higher than the center of the circular tube, the central angle (360 ° − φ), the cross-sectional area S of the fluid can be obtained by adding the areas of isosceles triangles each having a length of two sides of D / 2.

  Further, the average flow velocity of the fluid is obtained by the fifth computation 505 using the surface velocity (point velocity) Vp and the water level h of the fluid obtained in the third computation.

  In the fifth calculation 505, a calculation (Va = kp · Vp) is performed by converting the point flow velocity Vp and the water level h into the average flow velocity Va of the surface. For example, assuming that the flow velocity distribution in the main line 1 is expressed by a logarithmic law and the pipe is rough, the following equation is an example of an equation for obtaining the coefficient kp for converting the point flow velocity into the average flow velocity: is there.

kp = {1 + n · g ^1/2 · R ⁻¹ / ⁶ · (8.5−Ar + 5.75 log ₁₀ (y / R))} ⁻¹
... (8)
Here, n: roughness coefficient of pipe surface, R: diameter depth (pipe shape, value that varies depending on water level), y: point velocity measurement water depth (= water level h at that point), g: gravitational acceleration, Ar: This value varies depending on R and n.

  From the fluid average flow velocity Va and the cross-sectional area S thus obtained, a fluid flow rate Q is obtained by a sixth calculation 506.

  In the sixth calculation 506, the cross-sectional area S calculated from the value Va obtained by converting the flow velocity Vp of the water surface into the average flow velocity in the fifth calculation 505 and the water level h and the civil engineering data 56 in the fourth calculation 504. To calculate the fluid flow rate Q. These calculations are repeated for each transmitter 3 within the signal reception range of the receiver 4 at regular intervals.

  In this way, by repeatedly executing each calculation for each of the plurality of receivers 4 by the calculation means 50, various quantities (for example, water level, flow rate, flow rate, etc.) of the fluid in each part in the main line 1 (hereinafter referred to as water level, flow rate). , Described as flow rate).

  The appropriate value determination unit 51 compares the values of the points obtained by the calculation unit 50 with each other, and determines whether or not the values of the points are appropriate. That is, it is determined whether or not there are inappropriate values for the water level, flow velocity, and flow rate at a plurality of points in the obtained inflow trunk line 1.

  For example, as shown in FIG. 1, at the place where the main line 1 and the branch line 2 are joined, a partially irregular and intense flow is generated due to the inflow from the branch line 2, and the transmitter 3 temporarily sinks deeply into the water. There are times when it falls. It is conceivable that the numerical value calculated by the radio wave from the transmitter 3 in which such a phenomenon has occurred shows an abnormal value. Therefore, the appropriate value determining means 51 compares the values at each point to determine whether the value at each point is appropriate, and removes the value from the calculation if there is an inappropriate value.

  As a result, appropriate water levels, flow velocities, and flow rates are obtained, and these values are displayed on the monitoring device 60 of the driving support device 6 shown in FIG. 1 as shown in FIG. 7, for example. FIG. 7 shows a display screen of the monitoring device 60, and displays a simulated state where the pump station is connected to the A trunk line, the B trunk line, and the C trunk line. Since the appropriate water level, flow velocity, and flow rate are obtained for each point on each main line, this is displayed as a numerical value 61 at each point on each main line as shown.

  The fluid amount calculation means 52 is obtained by the calculation means 50 and is determined by the appropriate value determination means 51 from the values at the respective points and the civil engineering data 56 relating to the shape and dimensions of the main line 1. Hereinafter, this will be described as the amount of rainwater). An example of this rainwater amount calculation will be described with reference to FIG.

  First, the section for calculating the amount of rainwater is divided based on the measured position of the transmitter 3. For example, intermediate positions Lh, L1, L2,..., Ll-2, Ll-1, and Ll between the transmitter 3 and the transmitter 3 are divided positions, and one section is between the divided positions and the divided positions. And Thereby, one transmitter 3 enters in one section.

  In the figure, Lc1,..., Lcn are positions of the transmitter 3. The section for calculating the amount of rainwater is from the measurement start point Lh on the upstream side of the inflow trunk line 1 to the measurement end point Ll on the downstream side of the inflow trunk line. One transmitter 3 enters each of the end sections including the measurement start point Lh and the measurement end point Ll.

  In each section set in this way, the amount of rainwater in that section is calculated from the value of the civil engineering data 56 with the water level at the point of the transmitter 3 in that section as the water level in that section. Then, the amount of rainwater V1 to Vn in each section is calculated, and the amount of rainwater in the trunk line 1 is obtained by summing up these amounts of rainwater. In this case, it is possible to improve the calculation accuracy of the amount of rainwater by removing the measurement value of an inappropriate place in the appropriate value determination means 51.

  The inflow amount calculation means 53 calculates the fluid (rainwater) inflow amount into the trunk line 1 by taking the difference in the fluid (rainwater) amount at each time. That is, the inflow amount calculation means 53 for calculating the inflow amount of rainwater calculates the difference between the amount of rainwater at a certain time and the amount of rainwater one step before that time, thereby calculating the inflow amount of rainwater that has flowed in at this time. The inflow amount thus obtained is displayed as a numerical value 62 for each trunk line on the monitoring device 60, as shown in FIG.

  The guidance output means 54 outputs various kinds of guidance to the monitoring device 60 of the driving support device 6 shown in FIG. That is, each value of the fluid in the trunk line 1 obtained by the calculation means 50 and the like, and the operation state 111 of the inflow gate 11 of the pump station connected to the trunk line 1 and the operation state 101 of the pump 10 are input. Are compared with each other, and appropriate guidance 63 for the inflow gate 11 and the pump 10 is displayed and output on the monitoring device 60 as shown in FIG.

  The control output means 55 inputs each value of the fluid of the main line 1 obtained by the arithmetic means 50 and the like, the operation status 111 of the inflow gate 11 of the pump station connected to the main line 1, and the operation status 101 of the pump 10, These are compared with each other, and a control command 551 for the inflow gate 11 and the pump 10 is output. That is, the control output means 55 outputs an appropriate operation / stop command to the rainwater pump 10 based on the comparison result between various measurement information in the main line 1 and the rainwater pump operation status and the inflow gate operation status, and the inflow gate. The operation command to 11 is output.

  Here, as a control example of the rainwater pump 10, the following method can be cited. For example, if the calculated rainwater inflow amount is compared with the current discharge flow rate of the rainwater pump 10, it can be determined whether the pump well level at the pump station will be increasing or decreasing. And the control of increasing or decreasing the number of operating rainwater pumps 10 as necessary becomes possible. By automatically calculating and determining this in the process controller 5, the rainwater pump 10 can be automatically controlled. The same applies to the operation of the inflow gate 11.

  An example of a support screen by the monitoring device 60 of the driving support device 6 is shown in FIG. The position of the transmitter 3 on each inflow trunk line A, B, C to the pump station, and the water level, flow velocity, and flow rate at that position are displayed with the numerical value 61 as described above. Further, by displaying the inflow amount of rainwater in each inflow trunk line A, B, C as a numerical value 62, it is possible to see how much rainwater is flowing into each inflow trunk line A, B, C.

  Further, the longitudinal cross-sectional view 64 of each inflow trunk line A, B, C is displayed graphically, and the water level at the position of the transmitter 3 in the inflow trunk line is connected and displayed as shown in FIG. You can know the condition of the water surface. It is also possible to present operational guidance 63 based on these measured values.

  With such a screen, the status of the inflow trunk lines A, B, and C can be displayed, and it is possible to provide effective information regarding rainwater pump control and inflow gate operation to the operator.

  These information can also be displayed on a Web browser by providing the process controller 5 with a Web server function. Furthermore, it is possible to provide information to external terminals (such as personal computers, mobile phones, and PDAs).

  Here, regarding the transmitter 3 which is an important component of the present invention, a large number of transmitters 3 are prepared and sequentially inserted by an input mechanism 7 provided upstream of the trunk line 1 as shown in FIG. The As for the turning-on of the transmitter 3, it is possible to control the turning-on timing from the making mechanism 7, for example, turning on only while the rain is continuing, or shortening the making interval while the rain is continuing. These input timings may be output from the process controller 5.

  For determining whether or not the rain continues, a rainfall signal from the ground rain gauge 12, a rainfall signal from a rain radar (radar rain gauge) (not shown), weather data distributed from the outside, or the like may be used. .

  If the number of transmitters 3 flowing down the inflow trunk line 1 increases, various measurements at many points can be performed. In addition, the calculation accuracy of the amount of rainwater in the inflow trunk line 1 is also improved.

  The transmitter 3 that has flowed down the inflow trunk line 1 and arrived at the pumping station facility is removed by a dust removing device at the pumping station facility or collected by a collecting mechanism installed at the pumping station facility.

  Thus, based on the signals from the plurality of transmitters 3 that flow down together with the fluid, it is possible to directly measure the water level, flow velocity, flow rate, and the like at a plurality of points in the inflow trunk line 1. Moreover, based on the information, guidance for facility operation, rainwater pump operation, and inflow gate operation can be performed.

  Comparing these with conventional measuring means, for example, in a water level / flow velocity calculation type flow meter which is one of ultrasonic flow meters, it is necessary to lay a flow velocity sensor at the bottom of the pipe, and the water level sensor is also a measurement dead zone. Must be taken into account. On the other hand, according to the above embodiment, the receiver 4 may be mounted near the top of the tube, and there is no need for a sensor mounting problem or a dead zone problem in the tube, which is also effective in terms of construction and cost. It can be said.

  Furthermore, it is possible to know the complicated behavior of rainwater in the inflow trunk line 1 such as the flow and storage of rainwater in the inflow trunk line 1 that could not be known so far. Very effective data can be obtained.

  These results are summarized as follows.

(1) Various measurements at a plurality of points can be performed without installing a large number of main water level meters and flow meters on the inflow main line, and can be realized at low cost. In addition, maintenance costs after installation can be reduced. Furthermore, it is easier in terms of construction than conventional measuring devices.

(2) Since the situation in the inflow trunk line can be accurately measured, it can be applied to rainwater pump control or inflow gate operation using this.

(3) It becomes possible to know the complicated behavior of the water surface of the fluid in the inflow trunk, such as the flow of the fluid in the inflow trunk, storage, and lateral inflow from the branch line.

  In the above-described embodiment, the sewer main line has been described as an example of the pipe, but the present invention is not limited to this, and can be applied to pipes through which various fluids circulate.

It is a whole lineblock diagram showing one embodiment of an in-pipe measuring device by the present invention. It is a functional block diagram which shows the structure of the process controller used for one embodiment same as the above. It is a block diagram explaining the calculation process in the process controller used for one embodiment same as the above. It is a figure explaining the positional relationship of the transmitter and receiver in one Embodiment same as the above. It is explanatory drawing of the calculation method which calculates | requires angle (theta) in one Embodiment same as the above. It is explanatory drawing of the calculation method which calculates | requires the fluid cross-sectional area in one embodiment same as the above. It is a figure which shows the driving assistance screen of the monitoring apparatus in one embodiment same as the above. It is explanatory drawing of the calculation method which calculates | requires the fluid quantity in the pipe line in one Embodiment same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe line 3 Transmitter 4 Receiver 10 Pump 11 Inflow gate 50 Calculation means 51 Appropriate land judgment means 52 Fluid amount calculation means 53 Inflow amount calculation means 54 Guidance output means 55 Control output means 60 Monitoring apparatus 61 of each point in a pipe line Numerical display 62 Numerical display of inflow volume 63 Guidance display 64 Graphic display of longitudinal section in pipe

Claims (18)

A transmitter suspended in the fluid in the pipeline,
A receiver for receiving radio waves or ultrasonic waves transmitted from the transmitter, which is provided on the ceiling in the pipeline, and moves with the flow of the fluid;
Calculation means for obtaining the distance from the receiver to the transmitter by the intensity of radio waves or ultrasonic waves measured by the receiver;
An in-pipe fluid measuring device comprising:   The receiver has a function of measuring the intensity and frequency of radio waves or ultrasonic waves transmitted from the transmitter, and the computing means has a first distance d1 to the first transmitter position at a certain time and a predetermined time. The second distance d2 to the second transmitter position later is obtained, and the first and second distances d1 and d2, the frequency Fi of the received radio wave or the ultrasonic wave from the first transmitter position, and From the difference ΔF between the reception frequency Fi and the known transmission frequency Fo, the velocity c of the transmitted radio wave or ultrasonic wave, and the value Δt for the predetermined time, the angle between the imaginary line in the first distance direction and the fluid surface The in-pipe fluid measuring device according to claim 1, further comprising an arithmetic function for obtaining θ.   The calculation means includes the frequency Fi of the received radio wave or the ultrasonic wave from the first transmitter position, the difference ΔF between the reception frequency Fi and the known transmission frequency Fo, the velocity c of the transmitted radio wave or ultrasonic wave, 3. The in-pipe fluid measuring device according to claim 2, further comprising a calculation function for obtaining a moving speed Vp of the transmitter from a cosine angle cos [theta] based on an angle [theta] between the virtual line in the first distance direction and the fluid surface.   The calculating means calculates a distance Δh from the receiver installed on the ceiling in the pipeline to the fluid surface from the sine angle sinθ by the angle θ between the imaginary line in the first distance direction and the fluid surface and the first distance d1. 4. The in-pipe fluid measuring device according to claim 2, further comprising an arithmetic function for obtaining the fluid surface height h from the distance Δh and the vertical height in the pipe.   The calculation means obtains the cross-sectional area S of the fluid from the fluid surface height h in the pipe and the civil engineering data relating to the shape and dimension of the pipe obtained in advance, and the cross-sectional area S of the fluid and the moving speed Vp of the transmitter 5. The in-pipe fluid measuring device according to claim 4, further comprising a calculation function for obtaining a fluid flow rate Q from a fluid flow velocity Va based on the above.   The receiver is provided at each of a plurality of locations along the flow direction of the pipeline, and the calculation means calculates each point in the pipeline based on the values measured by each of the receivers. The in-pipe fluid measuring device according to any one of the above.   The in-pipe fluid measuring device according to claim 6, wherein the calculation means obtains the surface height, the flow velocity, and the flow rate of the fluid at each point in the pipe line from the measurement signal from the receiver.   8. The in-pipe fluid measuring device according to claim 7, further comprising appropriate value determining means for comparing each point value obtained by the calculating means to determine whether or not each point value is appropriate. .   9. The fluid quantity calculating means for obtaining the fluid quantity in the pipe from the value of each point obtained by the computing means and the civil engineering data relating to the shape and dimension of the pipe. In-pipe fluid measuring device.   The in-pipe fluid measuring device according to claim 9, further comprising an inflow amount calculating means for calculating a fluid inflow amount into the pipe line by taking a difference between the fluid amounts at each time.   The in-pipe fluid measuring device according to any one of claims 1 to 10, wherein a plurality of transmitters are prepared and are inserted into the pipe line sequentially from the upstream side of the pipe line.   12. The pipe fluid measurement according to claim 11, wherein the pipe is a sewage pipe into which rainwater flows, and the transmitter is input only while the rainfall is continuing based on a rainfall signal from the rain gauge or weather data. apparatus.   The in-pipe fluid measuring device according to claim 1, further comprising a monitoring device that displays each value obtained by a calculation unit or various calculation units.   The in-pipe fluid measuring device according to claim 13, wherein the monitoring device graphically displays the fluid surface state in the pipe line based on the value of the fluid surface height obtained by the computing means.   Comparing each value of the fluid in the pipeline obtained by the calculation means with the operating status of the inflow gate and pump connected to this pipeline, and outputting appropriate guidance for the inflow gate and pump to the monitoring device The in-pipe fluid measuring device according to any one of claims 1 to 14, further comprising a guidance output unit.   The in-pipe fluid measuring device according to claim 15, further comprising: a Web server that causes a Web browser to display information output and displayed on the monitoring device.   The in-pipe fluid measuring device according to claim 15, further comprising an external display unit configured to display information output and displayed on the monitoring device on an external terminal.   A control output means for outputting a control command for the inflow gate and the pump by comparing each value of the fluid in the pipe obtained by the calculation means with the operation status of the inflow gate and the pump connected to the pipe. The in-pipe fluid measuring device according to claim 1, wherein the in-pipe fluid measuring device is provided.

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