BG65706B1 - Device for measuring the quantity of water in open channels - Google Patents

Abstract

The device is used to measure the water flow quantity, as well as the depth of open channels, dams, lakes, tailings ponds. Universality is achieved in terms of geometrical parameters of the measurement object, as well as high speed and precision of measurement and reading. The device consists of measuring pipes submerged in the water flow at two points distant from each other, the pipes being connected to a control module installed in an isolated chamber. In each of the submerged pipes (7) there is mounted a converter (4, 5) calibrated to measure the height (H1, H2) of a water column. The first converter (4) is located before a weir (2) mounted to the bottom of the open channel (1), while the second converter (5) is located after the weir (2) shaped as a curvilinear element whose cross section coincides in ratio with the cross section of open channel (1). Both converters (4, 5) are connected by a digitalization unit (6.2) to the control module (6), in the block diagram of which there are provided two-way connections of the microprocessor (6.1) and for manual data collection, as well as to a real time timer (6.4).

Description

Technical field

The invention relates to a device for measuring water flow in open channels, which is useful for measuring the passage of water through open channels, as well as for measuring the depth of water in dams, lakes and tailings.

BACKGROUND OF THE INVENTION

A measuring instrument with a load measuring overflow is known, in which the shape of the overflow and the measurement are a function of the level of flow in the open channel. The specific profile of the spillway is calculated by special formulas and is adapted to certain conditions. The spillway is curvilinear in shape, containing a top profile, joined by a curved portion to a horizontal element, terminating with a sharp edge and extending into a vertical wall. The overflow is designed to measure the water quantity by measuring the water level of the flow in an open channel.

The disadvantages of the known overflow are that it measures the water level of the flow and will not serve to solve the problem of measuring the water quantity in each case and in each open channel.

A method and installation for detecting leaked water in large diameter pipes or open channels are known. The measurement is performed by measuring the pressure with measuring tubes, but without transducers, at two points in the flow, respectively T1 and T2, created by a compressor, and reading by means of a low pressure device T and a device for measuring the difference T1-T2 in the pressure, connected to a microprocessor system that is connected to a data storage unit as well as to a recording device.

The disadvantages of the known installation are that the flowchart receives pressure through the submerged tubes and registers pressure data through the recording device, after which the data is fed to the microprocessor for processing. Sensors are lacking throughout the installation and in the flowchart, and the speed and accuracy of measuring, reporting and processing data are not sufficient for today's requirements. In addition, there is no feedback that allows for changes in the reporting intervals.

SUMMARY OF THE INVENTION

The problem to be solved is to create a device for measuring the amount of water in open channels that is universal, ie. not be dependent on the cross-section of the open channel, measuring and reporting with the required speed and precision for the object in question.

The problem is solved by means of a device for measuring the amount of water in open channels, including immersed in the water flow at two remote points measuring tubes connected to a control module mounted in an isolated chamber, wherein the control module contains measuring instruments and a microprocessor to which a data storage device and a data logger are attached.

According to the invention, in each of the submerged pipes, one converter is mounted, tared to measure the height (H1, H2) of the water column. The first is placed before the spillway installed at the bottom of the open channel, and the second is positioned after the spillway. The overflow is shaped as a curved element whose cross-section coincides with the cross-section of the open channel. The two converters are connected via a digitization unit to the control module, in which the block diagram provides two-way connections of the microprocessor in series, respectively to the digitization unit, to a manual data collection interface, to a real-time timer, to a coding device. transmitter, to a receiver decoder, as well as to non-volatile memory.

In addition, the pipes, respectively of the first converter and of the second converter, are fixed near the wall of the open channel.

At the same time, the control module is equipped with independent battery power and connections are provided respectively to GSM2

65706 Bl module and / or to a radio station, with a manual data acquisition device included therein, and to a computing unit in the form of a computer for processing data.

The advantages of the invention are that, thanks to a pre-dimensioned overflow channel mounted at the bottom of the open channel, precise hydraulic conditions are created to determine the water quantity. The dimensioning (burning) of the channel-specific overflow creates hydraulic conditions specifically for the channel on which the measurement is made. Since each open channel has its own specific geometry, namely: longitudinal slope, wall roughness, cross-section and slopes of the channel walls, accurate measurement of the water volume would be extremely time-consuming and complicated. Thanks to the first converter before the spillway and the second transducer after the spillway, tared to measure the spillway height of the spillway, as well as the related elements of the control module flowchart, which receive and send directly data to the flowcharts included in the flowchart. the control module, microprocessor, coding and decoding unit, as well as the calculation unit, provide extremely fast and accurate data processing. In this way the control, reporting and change of the water quantity in the open channel is achieved, necessary not only for reporting but also for the prevention of critical situations and accidents in controlled objects.

The elements of the device do not disturb the flow, which is why accurate measurements are made. The lack of a complex and heavy construction subjected to meteorological effects also contributes to the accuracy of the measurement.

Also, due to the stationary and once overflow measurement of the overflow tare, the maintenance of the measuring device is reduced only to the maintenance of the elements of the block diagram of the control module.

Explanation of the annexed figures

The invention is illustrated by the accompanying drawings, wherein:

FIG. 1 is an assembly view of the device in longitudinal section of the measured portion of the open channel of the invention;

2 is a cross-sectional view along AA of FIG. 1 according to the invention;

3 is a block diagram of a control module of FIG. 1 of the device according to the invention.

Examples of carrying out the invention

The invention shown in FIG. 1 and 2 is a device for measuring water quantity in open channel 1, to which a spillway 2. is attached to the bottom. The spillway 2 is formed as a curved element whose cross-section coincides with the cross-section of the measured open channel 1. To one of the sidewalls 3 of the open channel 1, a measuring device is mounted including a first converter 4 pre-overflow 2 and a second converter 5 after the overflow 2, the converters 4, 5 being connected to a block diagram of a controlled module 6 through which accepted into account, calculate and submit the final values of the measured water quantity. The first 4 and second 5 transducers are individually mounted in a corresponding tube 7, each secured to the side wall 3 of the open channel 1.

As shown in FIG. 3, the first 4 and second 5 converter are connected to the control module 6, in which the block diagram provides two-way connections of the central microprocessor 6.1 respectively to the digitization unit 6.2, to the interface 6.3 for manual data collection, to the timer 6.4 for real time, to encoder 6.5 for transmitter, to decoder 6.6 for receiver, and to nonvolatile memory 6.7. The control module 6 is provided with independent battery power 6.9 and connections are provided, respectively, to the GSM module 8 and to the radio station 9, as well as to the calculation unit in the form of a computer 10 for data processing. A radio device 9.1 for manual data collection is provided for radio station 9.

Application of the invention

The water meter is used in open channels,

65706 Bl independently of their own geometry, such as longitudinal inclination, wall roughness, cross-section, and channel slopes.

The use of overflow 2, which is mounted at the bottom of the open channel 1, contributes to the creation of accurate hydraulic conditions for determining the water quantity. The overflow 2 is shaped as a curved element whose cross section is in proportion to the cross section of the measured object, in this case the open channel 1. By the specific dimensioning or tare of the overflow 2, the device measures only Η1 and H2, i.e. the overflow height of the water column before and after overflow 2, after which it is easy to determine the water quantity Q by a known formula included in the computer calculation program 10.

The steps in preparing, installing and activating the measuring device are as follows.

1. A spillway 2 shall be constructed and shall be tared according to the geometry of the open channel 1 in which the measurement is to be made, determining the key curve of the formula Q = t / Nppl /, as well as all the characteristic conditions of the formula and the parameters involved.

2. The device is mounted in a pre-prepared waterproof chamber on the bank of the channel 3. Converters 4 and 5 are pre-tared to determine the measured height of water column H1 before overflow 2 and H2 after overflow 2. Since each converter 4 and 5 has an individual a calibration curve embedded in the memory of the control module 6 is not allowed to be swapped. The first 4 converter is installed before the overflow 2 and the second 5 after it in the direction of water movement.

3. The converters 4 and 5 are placed in their respective tubes 7, which are vertically fixed to the side wall 3 of the open channel 1, and the output cables of each are mounted in the respective inputs of the digitization unit 6.2 of the control module 6, which in turn plugs into the power source.

4. All the elements of the measurement part of the block diagram of the control module 6 as well as the GSM module 8 are set up to send data.

5. Measurement and transmission of the H1 and H2 values n times per hour begins, after which this information is transmitted for data processing. The information can be collected and transmitted manually with the intended devices 6.8 and 9.1 for this purpose or through the GSM module 8, as well as with a radio signal through the radio station 9. Depending on the conditions existing at the site where the water quantity is measured, the corresponding block diagrams of the measuring device provided for the various applications of the device according to the invention.

6. The actual measurement is as follows.

The measured value through the water column height converters 4 and 5 in the open channel 1 is converted into a current signal, which is transmitted by cable to the digitization unit 6.2. The calibration curve of each converter 4 and 5 is given as a function of the current by the height of the water column. Here the signal is converted into a digital signal. The control is realized through the microprocessor 6.1, equipped with non-volatile memory 6.7. The amount of memory provides storage of the measured data for a period of 1 year.

Measurements are taken, for example, every 5 minutes. Within 24 hours, 24 average values of H1 and H2 were obtained. In order to process and view this data, it is transferred to the computer 10, through which a special program performs the data processing, the ways of transferring the data are two: via E-mail or through the hand-held device 6.8.

In GSM module 8 a prima card is inserted to send one SMS signal every day. Within one month, about 31 data signals are received, which is easily feasible and cost effective. A known formula is included in the program for calculating the water quantity, which includes the values of the device H1 and H2 measured by the device, design parameters for the particular overflow 2, as well as parameters determined by the overflow tare 2. Some of the parameters are set permanently in the calculation program, and the only parameters that need to be entered are related to conc4

65706 Bl in-line installation of converters 4 and 5 in the open channel 1. This reduces the process to a minimum of labor, without the need for specialized personnel to service the device, which makes it widely applicable.

Claims (3)

Claims 1. A device for measuring water quantity in open channels, including dip tubes immersed in the water stream at two remote points connected to a control module mounted in an isolated chamber, wherein the control module comprises measuring devices and a microprocessor, to which a data storage device and a data recording device are connected, characterized in that one converter (4,5), tared for height measurement (H1, respectively) is mounted in each of the submerged pipes (7). H2) on a water column, in that the first converter (4) is positioned before the overflow (1) overflow (2) is mounted on the bottom of the open channel, and the second converter (5) is positioned after the overflow (2), the overflow (2) being shaped as a curved element whose transverse the cross section corresponds to the cross section of the open channel (1), and the two converters (4, 5) are connected via a digitization unit (6.2) to the control module (6), in which the block diagram provides two-way microprocessor connections (6.1) in sequence, respectively to the digitization unit (6.2), to interf JS (6.3) for manual data collection, to a timer (6.4) for a real-time to an encoder (6.5) for a transmitter, to a decoder (6.6) for the receiver, as well as non-volatile memory (6.7). Device according to claim 1, characterized in that the tubes (7), respectively of the first converter (4) and the second converter (5), are fixed near the wall (3) of the open channel (1). Device according to claim 1, characterized in that the control module (6) is provided with independent battery power (6.9) and connections are provided, respectively, to the GSM module (8) and / or to a radio station (9) , with a manual data acquisition device (9.1) included therein, as well as a computer processing unit (10) for processing data.