On the limited accuracy of balancing the axial fan impeller by automatic ball balancers

Abstract

Axial fans are widely used both in industry and at home [1]. The main source of vibration of such machines is the usual and aerodynamic imbalances [2,3]. There are known ways to reduce these imbalances both in the manufacturing process of the fan [2, 3] and in the process of work -by passive automatic balancers (ABs) [4][5][6][7].The efficiency of the static and dynamic balancing of the impeller of the axial fan VO 06-300 (Ukraine) with ball ABs was studied in [7] on a test bench. The conducted tests confirmed the effectiveness of the method but did not result in establishing the maximum achievable accuracy of the rotor balancing. This accuracy is affected by gravity, inaccuracy in the manufacture of the raceway, standstill of the balls, etc. [8][9][10][11][12]. The specific nature of field experiments does not allow assessing this effect. Therefore, it is important to study the process of automatic balancing in «ideal» conditionsthrough 3D modelling [13].