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| Variable frequency and adjustable constant pressure automatic control irrigation system and its application |
| HE Wuquan1,2, ZHANG Hua3, HE Xinye1, ZHANG Yufeng1 |
| 1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Yangling, Shaanxi 712100, China; 3.Shibaochuan Reservoir Administration Bureau in Weinan City, Shaanxi Province, Chengcheng, Shaanxi 715200, China |
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Abstract In a sprinkler irrigation system with long pipe, there is a constant frequency(50 Hz)motor to derive the pump for delivering water. If the irrigating area or elevation change greatly in an irrigation field, the sprinkler irrigation uniformity will become unsatisfactory. In order to solve this problem, a variable frequency and adjustable constant pressure automatic control irrigation system is proposed. In the system, frequency conversion and automation technique are combined, and it is a kind of mechatronic-intelligent device with variable frequency motor and closed-loop fully automatic control function, and it can control for one or more AC 380 V, 50 Hz pump motors automatically at the same time. An electrical circuit is designed for setting different constant pressure levels. As a result, the system can vary the pressure in a pipe network automatically according to the pressure levels prescribed, by opening and closing the electromagnetic valves installed in the network; eventually, an automatically adjustable constant pressure water supply irrigation process is realized. Through the analysis of an engineering project, it is shown that the maximum difference in sprinkler system head is 12.89 m while the pump operating at 50 Hz, by using variable frequency adjustable constant pressure control system, however, the maximum difference in the sprinkler head is 3.38 m, which has met the requirement on pressure variation. Also, this system has a few advantages, such as water saving, energy saving, high degree of automation, convenient operation and management, guaranteed safe operation of pipe network and pump. It allows a pump to supply water to the sprinkler under a prescribed pressure level according to an irrigation field partition, thus the irrigation uniformity of sprinkler is favourable and satisfactory.
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Received: 10 March 2013
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