The force analysis of the impeller is the basis of the strength calculation, but at present the analysis is not perfect. The calculation of the power consumption during agitation cannot be said to be jq, and the resistance of the impeller in the liquid is not constant, but varies. In the above strength calculation, there are still many factors that are not considered, such as the imbalance of liquid resistance, the impact of liquid on the impeller, and the cavitation effect on the rear surface of the impeller.
These factors all affect the strength of the impeller, so the single Calculating the blade thickness from the bending stress may not be enough. In addition, defects that occur during the manufacturing process should also be considered. At present, the safety factor is still used to deal with these problems to ensure the operation of the impeller in operation. Some mixing devices, due to the characteristics of the process itself, require that the mixing in the middle of the operation should not be interrupted arbitrarily. In some mixing processes, if the agitator is broken, the agitation will cause an accident. In these cases, the agitation design must have a larger full margin. The coefficient of impeller strength is made larger by the amount of hardness.