Structural Optimization And Experimental Research On Valve-Regulating Proportional Fertilization Pump

The proportional fertilization pump is a fertilization equipment with a stable fertilization ratio and adjustable fertilizer suction speed,which can meet the development needs of water and fertilizer integration technology.Valve-regulating proportional fertilization pump has high research value because of its simple structure and the ability to switch between pure irrigation and fertilization modes.However,the valve-regulating proportional fertilization pump has problems such as low fertilizer suction per cycle and small fertilization ratio adjustment range,which limit its application in high-efficiency irrigation technology to a certain extent.Aiming at solving the problems of valve-regulating proportional fertilization pumps and meeting the application of field water and fertilizer integration system,this paper systematically analyzed the structure and working principle of it.A combination of theoretical analysis and experimental research is adopted.firstly,The core structure of fertilizer mixed cavity and fertilizer suction components are proposed for improved design.Then,the key structure optimization design method of the fertilization pump was established.Finally,the performance of the application of the fertilization pump to the integrated water and fertilizer system was investigated.The main research contents and conclusions of this paper are as follows:(1)The structural characteristics and working principle of the valve-regulating proportional fertilization pump are analyzed.In order to guide the structural design of the fertilization pump,its working principle and movement process were explored,the main structural parameters,working parameters and performance parameters were put forward,and the periodic movement process and mechanical characteristics of the piston were theoretically analyzed.(2)The Structural design of the key components of the valve-regulating proportional fertilization pump was proposed.With the goal of increasing the fertilizer suction per cycle and simplifying the structure of the fertilizer suction components,UG was used to build a three-dimensional model,and the structure of the fertilizer mixed cavity and fertilizer suction components was designed.Then,the experiment was carried out to compare the performance of the fertilizer pump before and after the improvement.The results show that the improved fertilization pump has good performance.When the inlet and outlet pressure difference is 0.04 MPa-0.40 MPa,the fertilizer suction per cycle and the fertilization ratio maintain high stability,and the maximum of the fertilization ratio can reach 0.62%.(3)Optimization design of the fertilizer suction components of valve-regulating proportional fertilization pump was proposed.With the goal of increasing the fertilization ratio adjustment range of the fertilization pump,the effects of various structural parameters of fertilizer suction components on the fertilization ratio and the fertilizer suction per cycle were experimentally studied,and the optimization design method of the fertilizer suction components was established.The research results show that when the maximum diameter of the valve core is 10.0 mm,the internal diameter of the fertilizer suction cavity is 12.2 mm,the minimum shaft diameter of the fertilizer suction piston rod is 7.2 mm,and the seal ring stroke is 0.5 mm,the performance of fertilization pump is the most excellent.The fertilizer suction per cycle of the improved fertilization pump has increased by 2.6 times than the product,and the upper limit of the fertilization ratio has increased by 2.81 times.(4)The influence of the optimized valve-regulating proportional fertilization pump on the integrated water and fertilizer system was investigated.A comparative test study was carried out between the optimized fertilization pump and Venturi fertilizer applicator installed in the integrated water and fertilizer system.The results show that the optimized fertilization pump has a higher energy conversion efficiency of 41.55%,which is nearly 7 percentage higher than that of the Venturi fertilizer applicator,and the water distribution and fertilizer distribution of the drip irrigation system with the optimized fertilization pump are consistent.The water distribution and irrigation uniformity of the drip irrigation system equipped with optimized fertilization pump and Venturi fertilizer applicator are basically the same,but the former has better fertilization uniformity than the latter.