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| Design and experiment on fertigation plunger pump in center pivot irrigation system |
| Yan Haijun, Wang Zhipeng, Ma Kai |
| College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China |
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Abstract Fertigation technology for center pivot irrigation systems has increasingly become a research focus in precision agriculture inside and outside China. Fertigation equipment with high working pre-ssure and low but stable flow rate is the key factor to guarantee high fertigation uniformity. In order to meet the requirement of center pivot irrigation systems a double-cylinder plunger pump including liquid ends, drive ends, pistons, seals, AC motor and so on was designed by taking crop fertilization characteristics into account. The design flow rate per cylinder is 150 L/h and the maximum working pressure is 1.0 MPa. Meanwhile 100 h durability test, stroke regulation test(20%-100% stroke)and frequency conversion test(30-50 Hz)on a prototype of the pump were conducted. It was showed that the discharge of the pump decreases with increasing discharge pressure and all the variation coefficients of discharge within 100 h are smaller than 5% under various discharge pressures. The measured discharge is almost the same as the theoretical one, and the maximum error between them is just 7.5% at a 60% stroke. Additionally, the pump discharge rises linearly with AC motor frequency. Clearly, the pump discharge can be adjusted by changing the plunger stroke and altering the AC motor frequency to expand the range of pump discharge. The developed plunger pump is applicable for a fertigation system, such as the center pivot irrigation system to realize precision fertilization.
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Received: 01 November 2013
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