Abstract: In order to study the spray capability of the spray arm of the dishwasher, deeply analyzes the theoretical principle of the spray water velocity and total pressure, preliminarily discusses the improvement of the spray capability through the calculation formula, and compares the similarities and differences of spray water and its adjustment in the spray arm full pass mode and the alternate washing mode. Then, emphatically introduces the total pressure tooling based on the Pitot-tube theory. Taking the total pressure of the spray water as the parameter to evaluate the spray capability, the experimental results show that the alternating washing mode can form a significant pressurization effect, thus the spray capability and motion performance of the spray arm have been significantly improved. Finally, through the comparative cleaning test, it is further verified that the alternative washing mode can effectively improve the cleaning performance.

Key words: Spray system, Spray capability, Cleaning performance, Total pressure, Velocity