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| Design and test of piston injection pump and its application in precise fertigation |
| WANG Jingjing1,ZHUO Yue1,ZHANG Haohui1,YAN Haijun1*,WANG Chunye2,MENG Fanyu3 |
| 1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; 2. Intelirri(Beijing)Technology Co. Ltd., Beijing 100088, China; 3. Beijing Agricultural Technology Extension Station, Beijing 100029, China |
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Abstract In order to solve the problems of uneven fertilization concentration caused by the flow rate fluctuation with the changed irrigation pressure of irrigation pipeline in the integrated application of water and fertilizer. A piston injection pump with rated flow rate of 300 L/h and maximum working pressure of 1.0 MPa was designed. Then characteristic performances of the piston injection pump were carried out under different stroke ratio and power supply frequency. The fitting formulas of flow rate with power supply frequency, stroke ratio and irrigation pressure were established. The results showed that the working flow rate of the piston injection pump was very significantly positively correlated with the power frequency and stroke ratio, but significantly negatively correlated with the irrigation pressure. The flow rate measurement accuracy expressed by relative standard deviation(RSD)ranged from 0.09% to 1.43%. When the stroke ratio was 100% and the power frequency was 50 Hz, as the irrigation pressure increased from 0.1 to 0.5 MPa, the drop of the flow rate was 14.22 L/h, accounting for 4.58% of the average flow, and the maximum RSD was only 0.38%. It is indicated that the flow rate of the piston pump is very stable and can meet the needs of different working irrigation pressure of sprinkler irrigation and micro-irrigation water and fertilizer integrated system. In addition, taking the piston injection pump as the core component, the control strategy of only changing the power frequency of the piston injection pump was proposed this paper. It has the advantages of simple control algorithm, accurate flow regulation and low investment cost. It is suitable for precision fertilization of water and fertili-zer integration.
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Received: 28 January 2021
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ZHANG Zhonghua,SUN Xiudong,XIE Jinping,Li Hua,ZHANG Dongju,JIANG Tingting,LYU Mingli,*,HUA Lin. Numerical simulation of water-sand phase flow in regulator channel of micro-sprinkler irrigation system[J]. Journal of Drainage and Irrigation Machinery Engin, 2022, 40(2): 211-216. |
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