Influence of Crank Rod Ratio on the Flow Pulsation and Slider Inertial Force of the New Reciprocating Pump

抄録

Aiming at the problems of complex structure and unreasonable parameter setting leading to high flow pulsation rate of traditional hydraulic reciprocating pump in high pressure systems, a new reciprocating pump model with a simple structure was proposed based on the principle of variable orifice of mechanical iris mechanisms.First, based on the model of the new reciprocating pump, the analysis equation for flow pulsation is derived. Secondly, Fluent software is used to perform fluid simulation on the new reciprocating pump, verifying the correctness of the pulsation equation and analyzing the pressure distribution contour map and velocity distribution contour map of the internal flow field of the new reciprocating pump during the cycle. Finally, according to the analysis equation, the variation curve of flow pulsation rate with the number of new reciprocating pumps and the crank-connecting rod ratio is obtained, and optimization suggestions for the parameter setting of the crank-connecting rod in the new reciprocating pump are proposed. The results show that: The derived analytical formula for flow pulsation of the new reciprocating pump is correct. The flow pulsation rate increases with the increase of the crank-connecting rod ratio, and when the number of new reciprocating pumps is 5, the influence of the crank-connecting rod ratio on the flow pulsation rate reaches 87%. The degree of oscillation of the inertial force experienced by the slider decreases as the crank rod ratio decreases. To increase the maximum and minimum values of the instantaneous flow rate and reduce the oscillation degree of the inertial force experienced by the slider, the crank rod ratio should be controlled within the range of 0.2 to 0.3. This new reciprocating pump enriches the structure of the pump and provides certain references for reducing flow pulsation in reciprocating pumps as well as decreasing the oscillation degree of the inertial force experienced by the slider.