| The piston pump with cylindrical cam-drive mechanism changes the discipline of the movement of the plunger through the cylindrical cam-drive mechanism with special profile, which leads to no fluctuation in constant flow and pressure. The uneven degree of theoretical flow is zero. Compared with the traditional crank-link mechanism reciprocating pump, it has less number of component parts, smaller size and lighter weight. As the piston pump with cylindrical cam-drive mechanism is driven by tow AC motors, in order to get high flow it only needs to increase the motor speed instead of exchanging liner sizes. Simultaneously, compared with traditional triplex reciprocating pump, the piston pump with cylindrical cam-drive mechanism can achieve the purpose of long stroke and low-conflict times more easily. In order to reveal the kinematics and dynamics Characteristics of piston pump with cylindrical cam-drive mechanism and find out the value of the force between each parts and its changing regularity, this paper, basing on the mechanical system dynamics, carried out with following several work:(1)On the basis of the working principle analysis of the piston pump with cylindrical cam-drive mechanism, structure research has been made and the sizes of the primary component parts has been got, in addition, its3D model has been built by Pro/E which laid a foundation for the following dynamics study;(2)Combined with the theory of system dynamics, the stiff dynamical differential equation and the elastic dynamical differential equation of the piston pump with cylindrical cam-drive mechanism have been created, and their simulation models have been built. Simultaneously, considering the influence of the piston pump’s hydraulic unit, a co-simulation method based on the AMESim and Simulink has been put forward, and the co-simulation model of the piston pump has been built;(3)The results of stiff dynamical co-simulation and elastic dynamical co-simulation of the piston pump with cylindrical cam-drive mechanism have been analyzed contrastively, and the influence of the piston pump’s valve on flow and pressure of the system has been studied, in addition, the influence of phase error on flow of the piston pump have been analyzed;(4)Considering that the power end of piston pump with cylindrical cam-drive mechanism is driven by cam system which contact stress is great and contact pairs are easy to lose efficacy, contact stress between the contact pairs has been calculated by Hertz theory, and the strength check has been made. The result shows that the cylindrical cam-drive mechanism can meet the strength requirement.The results of research show that if the elastic deformation of component parts has been considered, dynamic load between each parts of the piston pump is greater than it has been considered to be stiff, and to some extent, the flow and pressure of the piston pump has been affected by the elastic deformation of component parts; then the working performance of piston pump’s valve make a strong impact on the uneven degree of flow; additionally, the changing regularity of uneven degree of flow with the variations of phase error has been found out through the co-simulation. These results above have certain guiding significance and great engineering value to design, manufacture and maintain the piston pump with cylindrical cam-drive mechanism. |
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