The Optimal Analysis And Design Of A Profiled Chamber Rotary Vane Metering Pump

The optimal design and simulation analyses of the current profiled chamber rotary vane metering pump were presented and optimal analyzed prototype was manufactured to test the precision and volumetric efficiency.First, referring to the literature on transition curve optimal design, a simple and easy transition curve combined five-powers and sine term was derived by analyzing the radical velocity, acceleration and jerk of vane. The analysis and calculation results show that the maximal value of velocity and acceleration of combination transition curve bigger than those of seven and eight power transition curves, but theoretical non-vibration in the combination transition curve have been satisfied. In addition, the maximal value and frequency of jerk of combination transition curve is smaller than those of seven and eight power transition curves. Additionally, the less power of combination transition curve make it easier for machining. Based on the newly-derived transition curve, the feature of vane tip shape and the resistance hole were also calculated.Second, the static and dynamic condition of this profiled chamber rotary vane metering pump was described. The analysis and calculation of variation regularity of pressure angle was presented in order to control vibration, wear and side force of vane. On the basis of optimal design of cam ring transition curve, variation regularity of pressure angle was analyzed under the condition of the kinematic pair of vane and the combination transition curve in the profiled chamber rotary vane metering pump. According to geometrical structure of the kinematic pair and characteristic of the force acting on vane and vane motion, the relationship among pressure angle and rotation angle, vane thickness and vane tip shape was produced in each of analytic models respectively as well as contact point regularity. The analysis and calculation results show that pressure angle first increase then decrease with the variation of rotation angle; pressure angle is independent on vane thickness and increases with the increase of vane tip shape in arc vane tip shape; pressure angle increases with the increase of vane thickness in flat vane tip shape. Also, the modal and reliability of vane was simulated by ANASYS software to obtain the influence factor on vane vibration and reliability.In addition, the gap flow equation of seal was established to obtain the minimal gap of leak. Based on the principle of liquid mechanics and hydraulic transition, the explicit flow functions containing conditions of the vane thickness, cam ring contour curve, the conduit shape and the reverse flow are produced to discuss the flow variation. The calculation and simulation demonstrate that the flow pulsation will increase with the increase of vane thickness and the vane tip shape has little effect on flow pulsation. In addition, the vibration of vane determines the flow pulsation.Finally, the prototype was manufactured and standardization experiment was done in the simple method to prototype was manufactured to test the precision and volumetric efficiency.