Performance Analysis And Optimized Design Of 1400HP Diaphragm Pump Power End

Diaphragm pump belongs to the category of reciprocating pump.The difference between diaphragm pump and traditional reciprocating pump is that there is a layer of rubber diaphragm between the power end and hydraulic end of diaphragm pump,which separates the transported materials from the components of power end,avoids the corrosion or wear of corrosive or abrasive materials on the components of power end,and effectively protects the components of diaphragm pump drive end.With the wide use of diaphragm pump,the performance requirements of the key components at the power end of diaphragm pump are becoming higher and higher.In this paper,in view of the current demand for the development of diaphragm pump towards high-speed,high-strength and heavy-duty direction,taking the transportation of high-temperature,high-pressure materials,solid-liquid two-phase flow industrial slurry as the application background,taking the key components at the power end of 1400 hp diaphragm pump as the research object,focusing on 1400 hp diaphragm pump On the strength of crankshaft,connecting rod and crosshead structure,the performance of diaphragm pump power end is studied,and the crankshaft structure is optimized on the basis of strength analysis.The main work of this paper is as follows:The three-dimensional model of the power end(crankshaft,connecting rod,crosshead)of 1400 hp diaphragm pump is built.According to the kinematic and dynamic principles and combined with the basic parameters of 1400 HP diaphragm pump,the hydraulic end and power end of the diaphragm pump are calculated respectively.The compression condition of the rubber diaphragm at the hydraulic end of the diaphragm pump in a week is deduced,and the motion law of the crankshaft connecting rod mechanism in the whole working process is deduced,In addition,matlab program is used to solve the stress between the parts in a stroke range,which lays the foundation for the later finite element static and dynamic analysis.Based on the theoretical knowledge,the structural strength and stability of the connecting rod,crankshaft and crosshead are checked.The structural strength of the crankshaft and connecting rod is analyzed every 30 ° by using ANSYS,and the fatigue life of the crankshaft is analyzed.The results show that the stress concentration occurs at the connecting fillet between the big and small end of the connecting rod and the rod body,and at the baffle plate of the big and small end of the connecting rod,and the stress value at the baffle plate of the small end of the connecting rod is the maximum;the maximum stress of the crankshaft occurs at the support of the main journal at the left and right ends;the static analysis is carried out under the condition of the maximum stress of the ANSYS crosshead,and the stress concentration point of the crosshead is obtained At the edge of the upper and lower circular grooves.The results obtained are far less than the yield strength of the material,which proves that the structures at the dynamic end meet the structural strength requirements.The first six natural frequencies and modes of crankshaft,connecting rod and crosshead are calculated.The resonance frequency and its influence on the vibration are analyzed.Chinese styleBased on Ansys,the structural optimization analysis of diaphragm pump crankshaft is carried out.On the basis of ensuring the mechanical properties and safety,the combination of parameters to minimize the crankshaft mass is obtained,and the modal test and harmonic response analysis are carried out for the optimized crankshaft...