Mechanical Analysis of the Pump Head of the CDJY2500 Five-Cylinder Fracturing Pump

In the mechanical property study of the pump head of fracturing pump, there are few researches on the stress change of pump heads with different plunger sizes under different working conditions. In view of this, using ANSYS Workbench software, the mechanical properties of four different types of pump heads of the CDJY2500 five-cylinder fracturing pump under various internal pressure loads are numerically analyzed.The analysis results show that the maximum stress and strain of the pump head under discharge condition are always greater than that under the suction condition. Under the rated maximum pressure load of 140 MPa, the maximum stress of the pump head body is 788.76 MPa, which is less than the yield strength of the material.Under different pump strokes, with respect to the ø95.3 mm plunger, the average maximum stress value of the pump heads is reduced by 15.6%, 42.4%, and 52.1%, respectively. The average values of the maximum total deformation are reduced by 12.9%, 34.7%, and 62.7%, respectively. Under the pump strokes of 115~200 min^-1, the maximum stress and maximum total deformation of the pump head decrease rapidly with the pump stroke. Under the pump stroke of 200~330 min^-1, the maximum stress and maximum total deformation of the pump head slowly decrease with the pump stroke. The research results could provide basic data for structural optimization and improvement of the pump head.