SU762810A1 - Command pulse generator for closed-loop irrigation systems - Google Patents

Description

The invention relates to agriculture and can be used for irrigation of agricultural crops by sprinkling using pulse-. sprinklers controlled by a pressure drop signal in the network.

A generator of command pulses for closed irrigation systems is known, which includes a hydraulically controlled diaphragm valve, the supermembrane cavity of which is connected by a communication channel with a hydropneumatic accumulator of a control sprinkler and installed between the discharge and suction nozzles of the £ ΐ3 pump.

The disadvantage of such a generator is a significant duration of the formation of a signal to reduce the pressure.

A generator of command pulses for closed irrigation systems is also known. It includes a three-way hydraulically controlled valve with an inlet, outlet and drain nozzles, which is hydraulically connected to an ejector made in the form of a diffuser, a nozzle and a supply chamber 30

2

accumulator and distribution pipe [2].

The disadvantage of this generator is a significant discharge of water to the drain when forming the signal of the pressure drop.

The aim of the invention is to reduce the discharge of water to the drain.

This is achieved by the fact that the outlet of the three-way valve is connected to the diffuser of the ejector, the nozzle of which is connected with a hydropneumatic accumulator by means of a check valve, and the inlet chamber communicates with the distribution pipeline.

The drawing shows a diagram of the proposed command pulse generator for closed irrigation systems.

The generator includes a three-way hydraulically controlled valve 1, an ejector 2, a return valve 3, a hydropneumatic accumulator 4, a hydro relay 5, a throttle controller 6 and hydraulic communication channels 7-9.

The three-way hydraulic control valve 1 consists of a piston 10 with a rod 11 and a plate 12. The housing of the hydraulically controlled valve has three pat3

762810

four

Tubka - input 13, output 14 and drain 15.

The ejector 2 consists of a diffuser 16 connected to an outlet nozzle 14, a nozzle 17, a supply chamber 18 and a nozzle 19. The nozzle 17 of an ejector through a check valve 3, the stroke of which can be adjusted by a screw 20, is connected to a hydropneumatic accumulator 4. The inlet chamber 18 of an ejector by a nozzle 19 connected to the irrigation system distribution piping.

Hydro relay 5, regulated by spring 21, is hydraulically connected by a communication channel 7 to a three-way valve 1, and by communication channel 8 to a hydropneumatic accumulator 4. The inlet chamber 18 of the ejector is also connected to a hydropneumatic accumulator through a throttle 6 ’.

Hydropneumatic accumulator 4, hydro 'relay 5 and throttle controller 6 perform the functions of a hydraulic time relay when filling the system with water. The spring 21 regulates the limiting pressure in the hydro-pneumatic accumulator 4, and the a-throttle regulator b - the time of its filling up to this pressure.

The check valve 3, the hydropneumatic accumulator 4 and the hydro relay 5 function as a time relay when generating a pressure reduction signal in the pipeline network, the duration of which is regulated by a screw 20.

When the system is filled, the piston cavity of the three-way valve 1 is in communication with the atmosphere through the hydraulic relay 5, the valve plate 12 is raised up and closes the drain.

Water from the pump through the inlet 13, the outlet 14, the 'diffuser 16, the inlet chamber 18 and the nozzle 19 enters the system to fill the pulse sprinklers. At the same time, the check valve 3 is closed, and the filling of the hydro-pneumatic accumulator 4 takes place via an adjustable throttle 6. When the hydro-pneumatic accumulator 4 is filled, the pressure in it increases and as soon as it reaches the value adjusted by the spring 21, the hydraulic relay 5 switches and connects the over-piston cavity of the three-way valve c. hydropneumatic accumulator 4.

Water from the hydropneumoaccumulator under pressure through channels 7 and '8 of communication and the hydrorelay 5 enters the piston chamber of the three-way valve and shifts the plate 12 of valve 1

down, closing the flow of water from the pump and opening the drain. The pressure of water in the outlet pipe 14, the diffuser 16, the inlet chamber 18 and the nozzle 17 drops sharply. From the hydropneumatic accumulator 4 under the action of compressed air, water opens the check valve 3 and through the nozzle 17, the diffuser 16, the outlet 14 and the three-way valve 1 goes to the drain, simultaneously sucking the water from the irrigation system, thereby. creating in her a command impulse to lower the pressure. The duration of this signal depends on the volume of the hydro-pneumatic accumulator 4 and the degree of opening of the check valve 3, which is regulated by the screw 20.

If the pressure in the hydropneumatic accumulator 4 drops, the hydrorelay 5 returns to its original position, then the overpiston cavity of the three-way valve 1 is connected to the atmosphere through the hydrorelay 5 and the piston 10 with the rod 11 and the plate 12 valve 1 rises to the initial position, after which the cycle of the generator is repeated.

The introduction of the invention allows to reduce the discharge of water into the atmosphere, strengthen the command signal to simplify the design and reduce hydraulic losses.

Claims (1)

Claim Command pulse generator for closed irrigation systems, including a three-way hydraulically controlled valve with inlet, outlet and drain nozzles, hydraulically connected to an ejector made in the form of a diffuser, nozzle and inlet chamber, hydro-pneumatic accumulator and distribution pipeline, characterized in that, in order to reduce water discharge on the drain, the outlet of the three-way valve is connected to the ejector diffuser, the nozzle of which is connected to a hydropneumatic accumulator by means of a check valve, and the inlet chambers · communicates with the distribution pipes.