SU1425616A1 - Apparatus for controlling water level in canal - Google Patents

Abstract

The invention relates to the automation of water distribution, in particular, to systems for regulating the level of water in an irrigation canal, and can be used to automate adjustable hydraulic structures on open irrigation canals. The purpose of the invention is to increase the exact UiiU-M (i i-3 Niv and control speed throughout the channel, as well as improve the reliability of the device. This is achieved by having a device with a headwater sensor 5, the first accumulator 7, the inverter 10 , controller 12, actuator 13 and gate 3, located between the upper 2 and lower 1 pools of adjacent channel sections, the downstream water level sensor 4 and the second with the accumulator 6, as well as the upstream head level indicator 9 and the downstream level indicator 8 additionally contains a third adder 11. The application of the proposed device allows to increase the dynamic accuracy and the speed of water level control throughout the canal, as well as to improve the reliability of the device operation. At the same time, the non-production irrigation water discharges in the canal are significantly reduced. and about s:

Description

Fia. one

The invention relates to the automation of water distribution, in particular, to water level control systems in the irrigation canal, and can be used in the automation of regulated hydraulic structures and open irrigation canals. ; The purpose of the invention is to increase the precision and speed of regulation of 1; 1p to the whole channel, as well as increase the operation time of the device. I FIG. 1 shows a block diagram of a device to be advertised; in fig. 2 - with | hema regulator.

I The device contains the downstream 1, the upstream 2, the water regulating plug 3, the downstream water level sensor 4, the upstream water level sensor 5, the second adder 6, the first adder 7, the downstream level indicator 8, the level 9 endpoint upper inverter, inverter 10, third adder 1 | 1, controller 12 and executive Mechanism 13.

; The controller 12 (Fig. 2) contains an El Cent Comparison 14, an ignition unit 15, a sawtooth voltage generator 16, a comparator 17, a control pulley 18 and a pulse element 19.

The device works as follows.

I With changes in the water level in the bottom 1 of the i-th channel section from a predetermined value by setting unit 8 (for example, when the water level in the downstream 1 increases as a result of a decrease in water consumption in this pool) It is the deviation signal; „equal to the impurity of the signals of the sensor 4 and the set points of Kfe 8. The output signal of the adder 6 (or adder 7) can be represented as:

 (I.V)

  1n, b1

 0 (4.5)

(-V (

hell (8))

).

and.

IDVKS).

the deviation signal of the x-th channel section at the output (H) of the adder 6 or (B) of the adder 7; the output of the downstream water level sensor 4 or the 5 level water level sensor of the upstream i-ro section;

U, jg, (g (, j is the output signal of the setter of the 8 level of the lower pool or the setter of 9 level Yu 15

thirty

50

20

f5

five

0

five

n the top of the i-ro section.

Thus, with an increase in the water level above a given, the deviation signal C; (n, c) has a positive sign and vice versa, when the water level decreases below a given deviation signal ilH.M has a negative sign.

Deviation number; n arrives at the first input of the adder 11 of the i-ro plot. Since no other signals are received at the remaining inputs of summation unit 11, a deviation signal appears at the output of the indicated block; j ,, which is transmitted to the second input of controller 12. The latter forms a sequence of control pulses that arrive at the actuator 13, which leads to the cover of the water regulating valve 3. As a result, the flow of water through the valve 3 of the i-section of the section decreases and the water level in the downstream 1 gradually returns to the specified value.

When the water level in the upstream 2 (il) -ro section of the channel changes from a predetermined value by setting unit 9 (for example, as the level increases), the level change signal is fed to the first input of the adder 7, at the output of which a deviation signal appears (;., b equal to the difference between the signals of sensor 5 and setpoint 9, and through inverter 10 is fed to the first input of controller 12. Inverter 10 allows covering shutter 3 with increasing - upstream level 2 and opening shutter 3 while decreasing upstream level 2. Regulator 12 forms a sequence of governing the pulses that act on the actuator 13 and the shutter 3 is covered. As a result, the water flow through the shutter 3 of the i-section of the section decreases. To avoid overflowing the water level in the upper reach (i-1) ro of the channel section, the deviation signal (ii) b comes to the second input of the adder 11 (i-1) -ro of the section, to the first input of which the deviation signal 6 (, -.) of the downstream (i-1) -th section arrives, and the third input receives the deviation signal 6, n ,

Thus, at the output of the adder 11 (i-l) -ro of the section there is a total signal of the deviation of the water level in the lower reach of the i-ro section and the lower and upper reach (i-l) -ro

stk. At the same time, in order to increase the accuracy of water level regulation in the canal, the summation is performed taking into account the water loss factor of the channel sections K (filtration losses, evaporation, etc.). The output signal of the adder 11 can be represented, for example, for the (i-l) -ro portion in the form:

Jl

J

i, i + 1, ..., n,

where and. , - Vkodnoy signal summa--

torus 11 (i-l) -ro plot; K - coefficient of water loss

i-ro parcel; Cjg - level deviation signal

water upstream i-ro

plot; ; c - level deviation signal

i-ro downstream water

plot.

The output signal of the adder 11 (il) of the section goes to the second input of the controller 12. At the same time, the controller 12 (il) -ro of the section generates a control signal taking into account the total signal of the deviation in the lower and upper pools (il) -ro of the section and downstream i-ro plot. For example, when the water level in the upstream (il) -ro section of the channel of the regulator is increased, the 12th i-th section forms a sequence of control pulses aimed at covering the gate of the i -th section, but on the other hand, the regulator 12 (il ) The -ro section, based on the total signal of the i- and (il) -ro channel sections, also generates a sequence of control pulses aimed at covering the gate 3 (il) -ro section, if the total signal of the deviation U .., there is no positive sign, and the opening of the shutter 3 (il) -ro section, if the total signal about deviation Ug - / -. has a negative sign. This increases the accuracy and speed of adjustment throughout the canal and prevents the water level from overflowing in the canals.

If the water level in the upstream (i-2) -ro section of the channel changes, for example, it increases, the inverted deflection signal is sent to the first input of the regulator 12 (i-1) -th section, and the second input of the regulator 16

In the 12 (i-l) -ro portion of the plot, there is a summation signal Uj -, -.,. Comparison element 14 of controller 12 compares the inverted signal (; -,) g and the total deviation signal and, if the output signal of comparison element 14 has a positive sign, regulator 12 forms a sequence of control pulses aimed at shutting off gate 3 (il) - the first section, and, on the contrary, if the output signal of the comparison element 14 is negative, the controller 12 forms a sequence of control pulses aimed at opening the shutter of the 3 (i-1) -th section.

Thus, the proposed device, when the water level in the upstream of any canal section increases, compares the deviation signal of the indicated upstream with the total deviation signal of the downstream and upstream pools of all downstream canal sites and, if the sighed signal has a positive sign, the gate 3 of the hydraulic structure of the downstream site the channel, and if the comparison signal is negative, the gate 3 of the hydraulic structure of the downstream section of the channel opens, also allows to increase the accuracy of controlling the water level around the channel, improve quality control and overhead umenschit

water loss through the canal. I

The device works similarly in all the upper sections of the canal up to the main structure. When the water level decreases in the pools of canal sections, the device works in the same way, but in the opposite direction. .

The fact that, in the proposed device, there is only one controller in each section of the channel, allows to increase the reliability of operation and reduce the cost of the device.

Claims (1)

Formula invented shadows A device for adjusting the level of water in the channel, containing a series-connected upper-level water level sensor, a first adder, an inverter, a regulator, an actuator and a shutter located between the upper and lower pools of adjacent sections of the channel, sequentially connects the downstream water level sensor and the second adder, as well as the tHft adder, the advertizing level of the upper loop and the level adjuster of the lower bay, the output of the upper level adjuster (|) is connected to the second input of the first adder, and the output of the adjuster is ur The lower tail is connected to the second run of the second adder, characterized in that, in order to improve the accuracy and speed of the device, the first input of the third adder is connected to the output of the second adder, the second input to the output of the first adder, the third input to the third adder the downstream structure, and the output is with the second input of the controller, the output of the second adder is connected to the input of the inverter. From 10 About t 11 W nineteen C / 7J j