Studies on the Computer Aided Design of Power Sprayer (IV)

Systematic Design of Power Sprayer and Predictions of their Performance

Abstract

This report describs about the systematic design procedure and predictions of shaft torque and mechanical efficiency in power sprayer.
The plunger diameter is the foundamental size in design process of power sprayer. In systematic design process, the plunger diameter was enlarged or reduced using the scale factor obtained as ratio of displacement volume of power sprayer,
The plunger diameters were calculated from practical displacement volume for four power sprayers, and compared with the practical sizes of supplied models. They agreed approximately.
In the models designed by systematic design, the performance predictions using the calculating equations of torque, were practised. Furthemore, the test on four power sprayers was conducted, and the both results were compared with each other.
As the displacement volumes were changed, the torques were changed by the scale foctors L, L^2/3, and L^4/5, respectively and they were shown Fig. 2.
The predicted results of performance were approximately the same as experimental results.
The shaft torques and mechanical effciency were calculated for those models which were designed by systematic design in the range of scale factor L=1.0-2.82 and discharge pressure P=0-25kg/cm², were shown in Fig, 5 and 6.
The usefulness of systematic design and performance prediction in power sprayer were recognized.