Constant-current frequency-conversion micro-irrigation system

Abstract

The invention discloses a constant-current frequency-conversion micro-irrigation system. The system includes a control system and a micro-irrigation system. The control system comprises a computer, a programmable logic controller (PLC) and a frequency converter, and the micro-irrigation system consists of a motor, an encoder, a water pump, a flowmeter, a pipeline and irrigation emitters; the programmable logic controller (PLC), by changing the power supply frequency of the frequency converter and adjusting rotation speed of the motor, achieves constant water outflow of the water pump and automatic adjustment of branch pipe pressure of far and near rotation irrigation groups. According to the constant-current frequency-conversion micro-irrigation system, under the situation of unchanged quantity of simultaneously running micro irrigation emitters, by adjusting the rotation speed of the water pump, the water outflow of the water pump maintains constant, and therefore no matter how far or near the water pump is, the outflow of the system maintains constantly unchanged, the automatic adjustment of the branch pipe pressure of the rotation irrigation groups and pressure of the irrigation emitters is achieved, and the irrigation quality of micro irrigation is improved.

Description

technical field [0001] The invention relates to a constant-flow variable-frequency micro-irrigation system, which belongs to the technical field of agricultural irrigation. Background technique [0002] As my country's water resources become increasingly tense, continuous improvement of irrigation water efficiency has become the main pressure faced by agricultural water use. Micro-irrigation technology with the advantages of water saving, energy saving, and uniform irrigation has become more and more widely used. Micro-irrigation technology is one of the most widely used high-efficiency irrigation technologies in the world. It refers to the irrigation method that uses special equipment to turn pressurized water flow into small water flow or water droplets to moisten the soil in the root zone of plants. The main forms include drip irrigation and micro-sprinkler irrigation. , Yongquan irrigation (or small tube outflow irrigation), seepage irrigation, etc. At present, the cons...

AI Technical Summary

Problems solved by technology

The disadvantage of this system is: due to the different distances between the micro-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 and high pressure at the inlet of the branch pipe near the water pump during operation.

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 emitters on them is different, and the flow rate cannot be kept constant, which affects the irrigation quality of micro-irrigation.

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