Olijnichenko L. Reducing of vibrations of low pressure axial fans by balancing of ordinary and aerodynamic imbalances

Investigate the possibility of automatic balancing by passive auto-balancers of ordinary and aerodynamic imbalances of the impeller of the axial fan. It is assumed that the impeller is made inaccurate or planted on the shaft eccentricity and misalignment. Using the disc theory of impeller were found the resultant vector and the resultant moment of the aerodynamic forces acting on rotating in the initial still air (gas) axial fan impeller. Find the corresponding their aerodynamic imbalance. It established its analogy with the imbalance of the unbalanced mass. Also, found its difference consisting in dependence of the aerodynamic imbalance on the density of air (gas). Was concluded about the possibility of balancing aerodynamic imbalance by corrective of mass before operating the fan. Was concluded about the possibility of static or dynamic balancing by passive auto-balancers of conventional and aerodynamic imbalances during fan operation. Is determined the efficiency of the dynamic balancing by the ball type auto-balancers of the impellers of the axial fan. For this purpose are compared vibro-accelerations on the protective sheepskin coat of the fan in the process of his work in different configurations: with and without ball type auto-balancers; after a presence and absence of additional masses which are fastened on a protective sheepskin coat.