Multistage constant-pressure sprinkling irrigation system for hilly land

Abstract

The invention relates to a multistage constant-pressure sprinkling irrigation system for a hilly land. The multistage constant-pressure sprinkling irrigation system for the hilly land comprises a variable-frequency and adjustable-speed first-stage constant-pressure water supplier, a main pipe, and a constant-pressure water flow servo valve for realizing secondary-stage constant-pressure water supply, branch pipes, vertical pipes and shower nozzles. The main pipe is directly connected with the variable-frequency and adjustable-speed first-stage constant-pressure water supplier and the branch pipes are connected with the main pipe after passing through the constant-pressure water flow servo valve. The branch pipes are provided with the vertical pipes and the shower nozzles uniformly. The main pipe is arranged vertical to the contour line. The branch pipes are arranged parallel to the contour line from the main pipe to two sides. The constant-pressure water flow servo valve particularly developed is used for secondary-stage constant-pressure water supply before the branch pipes. Therefore, the multistage constant-pressure sprinkling irrigation system for the hilly land is formed to overcome the problems of large difference of the water supply pressures of the branch pipes doe to a large topographical slope, incapability of enabling the spraying degree of uniformity to reach the requirement and poor irrigation effect, so that fields at different heights can be irrigated well. The multistage constant-pressure sprinkling irrigation system for the hilly land has the advantages oflow investment, high reliability and convenience for control and management.

Description

Technical field: [0001] The invention belongs to the technical field of farmland irrigation, and in particular relates to a multi-stage constant-pressure sprinkler irrigation system for mountain slopes. Background technique: [0002] There are 670 million mu of cultivated land in my country's mountainous and hilly areas, accounting for 45% of the total cultivated land area. Only 120 million mu of terraced fields have been repaired, and the remaining 550 million mu of hillside land is difficult to irrigate with ground irrigation even if there is water. Sprinkler irrigation is one of the most widely used water-saving irrigation engineering technical measures in China. It has the characteristics of water saving, labor saving, less cultivated land, strong adaptability, high irrigation efficiency and easy automation. However, the hillside sprinkler irrigation system under the pressurization condition of the electromechanical pump, due to the influence of the slope of the terrain ...

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Problems solved by technology

However, the hillside sprinkler irrigation system under the pressurization condition of the electromechanical pump, due to the influence of the slope of the terrain and the uncertainty of field water use, the pressure and flow of the pipe network system are usually in a state of change, and the working conditions of the pump are also in frequent changes. In the middle, the irrigation uniformity cannot meet the design requirements, especially in the case of a large terrain slope, even if the usual single-stage constant pressure sprinkler irrigation system with a constant pipe network pressure cannot meet the irrigation uniformity of fields of different heights Require

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