| The integration management of water and fertilizer is the future development direction in sprinkler irrigation machine. At the same time, the rapid development of the photovoltaic industry for PV also provides some convenient conditions. Based on some advanced irrigation and fertilization products from foreign countries and specific parameters of Chinese sprinklers,this paper designed and finished the installation of a new solar powered irrigation fertilization device, using hydraulics photovoltaic agriculture as the guiding ideology. Through theoretical calculation and practical considerations for selecting a series of pipe fittings and field tests,this paper tested the effects of different hydraulic parameters of fertilization rate and AC / DC power consumption of a motor and the comparison of different conditions of using issues, the study obtained the following conclusions:(1) Metering pump volume loss and resistance loss would increase and the volumetric efficiency of the pump decreased with the increase of diaphragm metering pump outlet pressure, resulting in metering pump outlet flow decreasing slightly with incensement of outlet pressure. On average, the flow rate change was not large as the maximum standard deviation was only 2.6, which meant pump outlet flow rate didn’t change with the pressure.the pump outlet flow could change with adjusting the metering pump stroke. The flow rate increased with the increase of the stroke which showed a approximately linear increasing and that adjusting the flow through the stroke had a high degree of accuracy.(2) The flow rate of diaphragm metering pump increased with the incensement of the speed of the motor. In different stroke and pressure, the ratio of the pump flow to the rotational speed is close to a fixed value. When working pressure was 20 m, 100% of stroke,the ratio of pump flow and speed was 0.09. In practical application, the injection rate of the metering pump can be controlled by changing the rotational speed.(3) Diaphragm type metering pump had the characteristics of pulsation, when the outlet pressure was fixed, the metering pump working pressure fluctuated greatly. The damper is able to eliminate the pulsation and increase the flow rate of the pump. With the incensement of the outlet pressure, the damper effect becalmed worse.(4) Under various conditions, the daily consumption of DC motor was lower than that of AC motor, and the efficiency of DC motor was higher. Under low power conditions, the AC motor power was about 3 times of the DC motor. Under the condition of 250 W photovoltaic cells and 2 120 ah photovoltaic devices, the fertilizer application in summer and winter in Yangling can meet a certain number of irrigation days. |
