SU1611274A1 - Command pulse generator for pulse sprinkling system - Google Patents

Abstract

The invention relates to agriculture, irrigation of agricultural crops by means of sprinkling, and can be used for irrigation with pulsed sprinklers. The purpose of the invention is to increase the reliability of work and expand the scope of application of the generator. The command pulse generator consists of pressure 1 and drain 2 pipelines, valve 3, ejector 4, hydraulically controlled shut-off valve 5 driven by differential piston 7 and command pulse sprinkler 6 with adjustable throttle 14. At the entrance of the piston 10 differential piston 7 it communicates with pressure head the pipeline from the inlet side of the valve 3, and the piston cavity 11 - with the water cavity 16 of the command pulse irrigation 6. Thanks to the communication channels 12.13 and the interconnected parameters of the command pulse rain Atel 6 and the check valve 5, water pressure from the valve input 3 emy Hydraulic shut-off valve 5 remains closed during the entire filling pulse sprinkler system. It is only after adjoining the separation diaphragm 18 to the roof 17, which creates a sharp increase in pressure in cavities 16 and 11, the shut-off valve 5 opens abruptly, forming a pressure lowering impulse in the network to trigger the impulse sprinklers of the system. After splashing out all the pulse sprinklers of the system, the shut-off valve 5 is closed under the action of the total pressure drop of water on the valve 3 and the ejector 4, displacing water from the piston cavity 11 into the atmosphere through the communication channel 13, the cavity 16 and the irrigation nozzle 21, as it is under the sky 13, The cavity 16. By virtue of the pressure, the piston 20 descends to the lower position and communicates the cavity 16 with the atmosphere. The pulse generator can operate in a large range of changes in the maximum pressure in the network (0.6-2.5 MPa) without changing the adjustments and dimensions of its main nodes. The adjustable throttle 14 sets the desired cycle of the pulse generator. 1 il.

Description

The invention relates to irrigation of agricultural crops by a method of sprinkling and can be used for irrigation with pulsed sprinklers.

The purpose of the invention is to increase the reliability of work and expand the scope of application of the generator.

FIG. 1 is a schematic diagram of a command pulse generator; in fig. 2 - the same fragment.

The command pulse generator consists of pressure 1 and drain 2 pipelines, valve 3 and ejector 4 installed at the inlet of the pressure pipe, hydraulically controlled shut-off valve 3 5 at the entrance of the drain pipe

2 and command impulse sprinkler 6. A hydraulically controlled shut-off valve 5 driven by a differential piston 7 is equipped with a valve with the last rod 8 and a valve plate 9. The differential piston has an under-piston 10 and a piston 11 cavity, respectively, with channel 12 through 12 pressure pipe from the inlet side of the valve

 channel 13 is connected with the accumulator (the core of the command pulse sprinkler 6. The latter is combined with the discharge pipe through the adjustable throttle valve 14, and accumulated, and the capacity of the sprinkler has an air 15 and 16 cavities separated by a perforated CBOAOivi 17 vi separation diaphragm 18 The command pulse puller is equipped with a hydraulically operated locking member 19 with a piston 20 and a sprinkler barrel 21,

The command pulse generator works as follows

When the pressurizing unit of the system is turned on, the pressurized water passes through the valve 3 and the ejector 4 through the pressure pipe 1 to fill the pulsed sprinklers of the system, since the hydraulically controlled shut-off valve 5 is closed by the pressure of water at the inlet of the valve 3. The system is periodically filled. water from the pressure pipeline 1 through the adjustable choke 14 enters the water cavity 16 of the command pulse sprinkler 6, and further along the communication channel 13 - into the sub-piston cavity 11 of the hydraulically controlled shut-off valve 5 and moves The separating diaphragm 18 is downward, compressing the air in the cavity 16. At the same time, the hydraulically controlled shut-off valve 5 remains closed until the separating diaphragm 18 adjoins the perforated roof 17.

After the diaphragm 18 adjoins the roof 17, which is the signal for filling all the pulse sprinklers of the system, the air in the cavity 15 is compressed and there is a sharp increase in pressure in the water cavity 16 and sub-piston cavity 11. As a result, valve 9 with rod B and piston 7 moves abruptly up and informs the pressure pipe 1 with the atmosphere through the drain pipe 2. A pressure drop occurs in the network, and the pulse sprinklers of the system are triggered. In this case, the pressure of the start of the splash must satisfy the conditions;

Рмакс (FI - F2) Рп (Г1 - РЗ), (1)

Рmax (Ft - F2} Px (Fl - РЗ), (2)

where Rmax - the maximum water pressure in the pressure pipe from the entrance of the ejector;

RP - water pressure in the pievmogidroakkumul torus {accumulator1. Tank capacity) at the beginning of the splash out of the command impulse sprinkler;

PX-pressure of water in the pneumohydroaccumulator after fitting the separation membrane to the roof;

FI is the area of the differential piston;

F2 - the area of the valve plate 5; RZ is the cross-sectional area of the rod of the hydraulically controlled check valve 5. At the beginning of the splash, the piston 20 of the shut-off member 19 goes down and communicates the water cavity 16 with the atmosphere through the sprinkler nozzle 21. Under the action of compressed air in the cavity 15, the diaphragm 18 rises and displaces water from the cavity 16 to the atmosphere in the form of rain. At the end of the output of the command pulse irrigation 6, the water pressure in the overhead of the auger cavity 11 drops sharply, under the action of the total pressure difference of the water on the valve 3 and the ejector 4, the piston 7 with the rod 8 and valve 9 drops down and cuts off the pressure pipe 1 from the discharge pipe 2, is displaced water from the cavity 11 to the atmosphere, the communication channel 13, the cavity 16 and the sprinkling nozzles 21 (the piston 20 moves to the lower position under a slight pressure of water in the piston cavity 11). The increase in pressure in the network begins. In the following, the whole cycle is repeated.

Valve 3 provides the total pressure over the water at valve 3 and ejector 4 necessary to close the hydraulically controlled shut-off valve 5 after the pressure decrease in the network at different irrigation areas served by the command pulse generator. The choke 14 sets the required cycle of the generator. The ejector 4 is designed to increase the pressure decrease pulse in the system when the pipeline network 1 is in communication with the atmosphere, and the pressure difference of water through it is used to close the hydraulically controlled check valve 5.

The water differential across the ejector 4 takes place at high costs through it. (The irrigated area of the system is large). With small systems, the differential on the ejector 4 is not observed (at a constant ejector size), since its throughput is much greater than the flow through it.

The required differential pressure (for small systems) to close the shut-off valve 5 after all the pulse sprinklers of the system 5 have been activated is provided with a valve 3 installed on the pipe network 1 from the inlet side of the ejector 4.

The proposed pulse generator operates in a large range of variation of 10 maximum network pressure (0.6-2.5 MPa) without additional adjustments and changes in the dimensions of its main nodes. Bla- according to conditions (1) and (2), you can get 15 impulses of pressure decrease in the network when the shut-off valve 5 is opened only after filling all system sprinklers and the separating diaphragm 18 on perforated arch 17. 0 Required pressure increase when the shut-off valve 5 is closed in the network, it is possible to obtain by means of the total pressure drop of water at the valve 3 and the ejector 4 after spilling out all the impulse sprinklers of the system and the command impulse sprinkler 6.

The generator is simple in design and reliable in operation, its use in the national economy will significantly increase the efficiency of the impulse sprinkler systems.

Claims (1)

Invention Formula Command impulse generator for 35 impulse sprinkling systems, including a pressure pipe with a command impulse sprinkler, a hydraulically controlled stop valve installed between the barrel and the storage tank of the last one and connected to a control cavity with a pressure pipe through a throttle, and a drain pipe, connected to a pressure head through a valve whose stem is driven by a differential The 45 pistons, over the piston cavity of which is communicated with the pressure pipe, and the pistons - with the accumulating capacity, about the t and h so that, in order to improve the reliability of operation and expansion, 50, or the area of application of the generator, it is equipped with a valve and ejector installed. sequentially at the entrance to the pressure pipeline between the place of connection to it of the piston cavity 55 differential piston and throttle. f9 FIG. 2