The Structure Design Of The Reciprocating Plunger Pump Rotating Sleeve Type Flow Distribution System Is Optimized

Rotating sleeve distributing-flow system has the advantages of compact structure,low pressure loss and no delay in distribution,which overcomes the disadvantages of valve distribution in traditional plunger pumps.The existing results have analyzed the kinematics and dynamics characteristics of the system,so as to design its structure and simulate the flow field characteristics of the system.However,they have not optimized the structural dimensions of the key parts of the system,and have not verified the feasibility of its working principle through experiments.In view of the above problems,this paper uses Isight combined with CFD technology to optimize the design of the key structure of the system,verifies the working principle of the system and the rationality of the optimization results through experiments,and improves the problems encountered in the experiments.In this paper,the structural principle of Rotating sleeve distributing-flow system is described.Based on this,the mathematical model and the fluid domain model are established.The system is simulated and analyzed by Fluent under rated working conditions,and its flow and pressure characteristics are analyzed.It is determined that the vibration reduction groove and the distribution port are the main structure to optimize.Aiming at the phenomenon of self-locking of the sleeve during the test,the kinematics characteristics of the system are further analyzed,it is concluded that the problem of cam groove profile is the cause of the self-locking of the rotary sleeve.Four new types of lines are proposed: arcsine profile,line profile,spline profile and tangent profile.The kinematics and flow field characteristics of the new type offline system are analyzed.Among them,the kinematics and flow field characteristics of the system of the line profile are better than the other three types.By using Isight integrated software such as SolidWorks,ICEM,Fluent and MATLAB,and by downhill simplex method,aiming at the highest volume efficiency,the vibration reduction groove and valve distribution port of the system are optimized,and the volume efficiency of the system is improved by 0.8%.After analysis,the oil absorption capacity and oil discharge capacity of the optimized system have been improved,the velocity vector of local area has been significantly reduced,and the optimization process has little influence on the pressure fluctuation of the pump chamber.According to the working principle,simulation model and virtual prototype of the system,combined with the structure of YST380 W hydraulic comprehensive test-bed,the parts of the system and the supporting and driving mechanism of the test-bed are designed and processed,and the test platform is built.The volume efficiency of Rotating sleeve distributing-flow system under different working pressures and rotating speeds are experimentally analyzed.The results show that the volumetric efficiency of the system increases with the increase of working speed and decreases with the increase of working pressure.When the rotational speed increases from 100 r/min to 500 r/min,the volumetric efficiency increases from 84.63% to 89.11%,and when the working pressure increases from 2 MPa to 6 MPa,the volumetric efficiency decreases from 92.63% to 89.11%.