SU1220588A1 - Irrigation system - Google Patents

Description

The invention relates to agriculture and can be used for the organization of irrigation of agricultural crops, in particular, by wide grip sprinkling machines with water intake from open sprinklers, for example, Kuban.

The purpose of the invention is the expansion of operational capabilities.

FIG. 1 is a diagram of the irrigation system; in fig. 2-3 - diagrams of the water supply controller are given, respectively, with continuous and discrete control.

The irrigation system contains an irrigation source 1, a water supply regulator 2, a distribution channel 3, sprinklers 4, gates 5 of water distribution nodes, stabilizers 6 are the ratios of level deviations in the conjunct upper and lower pools. A level 7 sensor is installed in the upper irrigator 4. The water supply regulator includes a comparison unit 8 (for the purpose of an inherent representation shown in the form of a mechanical lever), the input of which is connected to the level sensor 7.

The water supply regulator 2 contains a shutter 9 with a drive, for example, in the form of an electric motor 10 with a gearbox 11 connected to the comparison unit 8 via an amplifier 12 (Fig. 2 and 3).

The flow meter 13 is made, for example, in the form of a level gauge 14 with a non-linear transducer 15 and installed at the beginning of the channel. In the continuous control variant (Fig. 2), an algebraic summation and multiplication unit 16 is provided, through which the flow meter 13 is connected to the input of the comparison unit 8. The level sensor 7 is connected to the second input of the comparison unit 8, the output of which is connected to the actuator of the water supply regulator 2 through an amplifier 12.

In the case of discrete control (Fig. 3), the controller contains threshold relays 17, setpoint 18 and comparison unit 8, with setpoint 18 connected by its inputs to level sensor 7 via threshold relays 17, comparison unit 8 inputs are connected to setpoint 18 outputs and the flow meter 10, and the output of the comparison unit 8 is connected to the drive of the water supply controller 2 via the amplifier 12.

The number of threshold relays 17 (or the coefficient set on the multiplication unit 16) depends on the size of the range of permissible level fluctuations at the point of installation of the level sensor 7, its error, deadband of the threshold

relays and the number of sprinkling machines in the system (in the simplest case, the number of threshold relays 17 is taken to be equal to or a multiple of the number of sprinkling machines). The system is configured so that at the maximum level in the sprinkler 4 with sensor 7 (with an estimated reserve to receive water from the supply channel) the shutter of the water supply regulator 2 is completely closed, and at a minimum level (also with an estimated reserve

on the run) - the water supply regulator submitted the flow, which is 5-10% more than the nominal water consumer by all the machines simultaneously switched on. The irrigation system works in the following way.

The stabilizer 6 controls the valves 5 so that in all irrigators 4 almost synchronous levels change is provided: when switching on additional machines, the levels in all irrigators 4 decrease, and when disconnected they increase, therefore the level value in the upper irrigator 4 in which it is installed The sensor 7, makes it possible to judge the ratio of the costs supplied to the system and consumed by the sprinkler machines: if this level decreases, the flow rate is less than that consumed, it should be increased; if the level rises, then the flow rate more than that consumed should be reduced. With continuous control, the amplifier 12 is supplied with the difference between the signal from the level sensor 7 and the signal from the flow meter 13 multiplied in block 16 by the calculated coefficient. If the flow rate corresponds to a given level, the difference between the signals is zero and the shutter does not move. If the flow rate is less (more) than the level (signal from sensor 7), the output of the comparison unit 8 receives a signal that goes to amplifier 12 and then to drive

0 shutter. The position of the gate changes until the flow rate is adjusted to the water level in the upper fill.

In discrete control, the system works in the same way: changing the signal 5 from the level sensor 7 triggers the corresponding threshold relay 17, which changes the setting of the setting device 8, after which the water supply controller 2 changes the flow rate until the level sensor CHrHji 7 match the signal setpoint 18.

five

fig.Z

Claims (2)

1. IRRIGATION SYSTEM containing an irrigation source, a distribution channel equipped with a water supply regulator, and sprinklers with sprinklers, each equipped with a level sensor, characterized in that, in order to expand operational capabilities, the water supply controller is equipped with a comparison unit and a flow sensor installed in the head part of the distribution channel and connected to one of the inputs of the comparison unit, the other input of which is connected to the level sensor of the nearest sprinkler, and the output is connected to the control drive water supply torus. 2. The system by π. 1, characterized in that, in order to provide discrete control, each level sensor is connected to the comparison unit through a group of threshold relays.