| Axial variable plunger pump is a type of hydraulic component that converts mechanical energy into high pressure energy of hydraulic oil.It is widely used in many fields such as aviation,ships,cranes and so on.The working principle of the plunger pump is to increase the size of its sealed working cavity by the external force(larger oil absorption,smaller oil drainage),which is a positive displacement pump.It has the advantages of small size and low price.The disadvantage is that the plunger cavity and the plunger are easily stuck,which results in a decrease in the working efficiency of the plunger pump.Electro-hydraulic proportional control technology and stable running and small pulsation are important development trends of plunger pumps.Based on the theory,the software simulation method is used to carry out pressure pulsation,variable characteristics and structural optimization of the pump.Provide a reference for CY pump performance improvement and optimization.The paper uses the combination of theoretical analysis and simulation analysis to study the influence of the distribution plate structure on the flow pulsation and the stability problem in the flow control of the axial variable plunger pump.The paper mainly completes the following research contents:1.Explain the modeling process using AMESim.Through the simulation analysis,the pressure flow curves under different dip angles are firstly obtained,and the different structures of the distribution plate are compared and simulated,and the end of the waist groove of the distribution plate can be obtained.Reducing the large pressure shock suddenly caused by the sudden opening of the oil suction zone or the pressure oil zone during the rotation of the plunger,there will be pressure surge and flow backflow from the low pressure zone to the high pressure zone.The use of a triangular damping groove allows high pressure oil to flow into the plunger chamber through the groove to mitigate the impact to some extent.The impact of the pressure flow curve in the plunger chamber is reduced,and vibration and noise conditions are also improved.2.Explain a new type of variable mode of CY piston pump,obtain its variable characteristic curve,verify the correctness of the model,and study different speeds.The influence of load and external control current on the pump outlet flow rate is found to be unaffected by the load and speed.The external load change can maintain constant flow output,which provides a valuable reference for improving this variable mode in the future.3.For the problem of the cylinder stuck in the cylinder and the large volume of the cylinder,the finite element method is used to analyze and analyze the cylinder,the stress and strain calculation,the structural optimization,etc.The structural optimization of the cylinder body is proposed,and a new cylinder structure with small mechanism,light weight and strong strength is proposed.Compared with the original structure,under the same working conditions,the optimization can reduce the volume and save the steel material,so that the enterprise has more cost to invest in innovation,and at the same time provides an efficient and feasible optimization for other component structures.Methods. |
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