Abstract: The water flow system is one of the most important part of dishwasher, which is in closely relation with main performance such as washing performance, energy consumption, and noise. The effect of pump joint outlet size and the angle between inlet and outlet on flow distribution and spray arm pressure has been analyzed in this paper. In conclusion, if the outlet size leading to bottom spray arm decreases and the angle between inlet and outlet increases, the flow leading to bottom spray arm will be decreased and the flow leading to upper spray arm will be increased. So these methods can be used to optimize design, which can make water flow system more rational.

Key words: Dishwasher, Water flow system, Flow distribution and spray arm pressure, Structure optimization