Constant-current and variable-frequency sprinkling irrigation system

Abstract

The invention discloses a constant-current and variable-frequency sprinkling irrigation system. The system comprises a control system and a sprinkling irrigation system; the control system comprises a computer, a PLC and a frequency converter; the sprinkling irrigation system comprises a motor, an encoder, a water pump, a flow meter, a pipeline and a nozzle; and the PLC realizes constant water outlet flow of the water pump and automatic pressure adjustment of far and near wheel irrigation set branch pipes through changing the power supply frequency of the frequency converter and adjusting the rotating speed of the motor. Under the condition of keeping the number of sprinkling irrigation nozzles working at the same time invariable, the rotating speed of the water pump is adjusted to guarantee constant water outlet flow of the water pump, so that the spraying flow is constant no matter how long the distance from the water pump is, the automatic pressure adjustment of the wheel sprinkling set branch pipes and the nozzles is realized, and the water irrigation quality of sprinkling irrigation is improved.

Description

technical field [0001] The invention relates to a constant-flow variable-frequency sprinkler irrigation system, which belongs to the technical field of agricultural irrigation. Background technique [0002] With the increasing shortage of water resources in our country, sprinkler irrigation technology with the advantages of water saving and convenient operation has become more and more widely used. At present, the constant-pressure variable-frequency sprinkler irrigation system mostly used in our country is to connect the PLC programming controller with the pressure sensor, and keep the water pump outlet pressure constant through the PLC programming control. The disadvantage of this system is that: due to the different distances between the sprinkler irrigation branch pipes and the water pump, the hydraulic loss of the pipeline is different, resulting in low pressure at the branch pipe inlet far away from the water pump during operation, and high pressure at the branch pipe ...

AI Technical Summary

Problems solved by technology

The disadvantage of this system is: due to the different distances between the sprinkler irrigation branch pipes and the water pump, the hydraulic loss of the pipeline is different, resulting in low pressure at the inlet of the branch pipe far away from the water pump during operation, and high pressure at the inlet of the branch pipe near the water pump.

Therefore, the outlet pressure of the water pump is constant and the pressure of each branch pipe is different. Therefore, when different branch pipes are running, the working pressure of the nozzles on them is different, which affects the irrigation quality of sprinkler irrigation.

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