Optimum Design And Virtual Simulation Research Of Type ZY3NB2200 Reciprocating Drilling Pump

Known as the heart of a drill rig, the drilling pump has complicated structure and manufacturing technology. The ZY3NB2200 drilling pump is a novel high-power reciprocating drilling pump which is developed to meet the booming requirements of drilling technologies in China.This study was focused on the presently urgent domestic and international demands on high-power drilling pumps as well as the current situation, i.e., 2200-HP drilling pumps have not yet been introduced to China. By reference to a lot of previous research achievements and based on the knowledge of modern mathematics and mechanics as well as computer software, analysis and research work on the design and simulation of high-power drilling pumps and related key parts were conducted using theoretical derivation, numerical simulation and other approaches, and instruction work was conducted on the design of ZY3NB22000 high-power drilling pumps according to the results of the simulation and analysis.Firstly, design schemes and computation theories for all the systems and major parts of ZY3NB2200 drilling pumps were summarized by referring to domestic and international literature and related design criteria. Based on the basic theories of computation, the pressure of a drilling pump, the kinematic relationships among driving mechanisms as well as the stress at the power end of the drilling pump and the strength of the crank shaft, etc. were analyzed to provide evidence for the finite-element numerical simulation.Secondly, the Virtual Prototype Technology was employed in the study to build a 3-D solid model for all the systems and major parts of a ZY3NB2200 drilling pump. Then, pump simulation and analysis was conducted based on kinematics and dynamics, and kinematic analysis and dynamic analysis were carried out on a virtual prototype; the design of the ZY3NB220 drilling pump was assessed comprehensively. According to the structure and the complicated stress characteristics of the ZY3NB2200 drilling pump, ANSYS, a finite-element analysis software, was employed for the static analysis of the key parts at the power end and hydraulic end of the ZY3NB2200 drilling pump to verify its static strength. Under the operation pressure, fatigue analysis was performed on the key parts to verify the fatigue life requirement. Model analysis and harmonic response analysis were carried out on the key parts at the power end of the drilling pump, and their inherent frequencies and modes of vibration were computed. Through harmonic response analysis, the resonance-prone frequency bands and the resonance forms were obtained, which provided evidence for the power design and check of drilling pumps.Thirdly, a kinematic model for the liquid at the hydraulic end of the ZY3NB2200 drilling pump was built, and CFD and FLUENT were applied in the simulation analysis of the liquid motion rule at the hydraulic end and the operation mechanism of the pump valve. The influences of the structure of the hydraulic end on the pressure fluctuation of the output liquid and the service lives of the quick-wear parts at the hydraulic end were investigated, and the structure design of the hydraulic end was optimized to endue the ZY3NB2200 drilling pump with excellent output performance and to extend the service lives of the quick-wear parts.Finally, the kinematic law of the pump valve was studied to optimize the design of the basic structural dimensions of the pump valve and to improve its service life. A mathematical motion model for the valve of the reciprocating pump was built, and an approximate solution was obtained with numerical methods.