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Pumps are the most common type of machine used in industry of any country.Modern pumps can have sufficiently wide range of operating parameters, namely rotation frequency of some turbo pumps can reach tens of thousands of revolutions perminute, the pressure of pumped liquids up to hundreds of MPa. Different production requirements determine the variety of pump layouts and the design of their components. Automatic balancing device is one of such elements of high-pressure multi-stage pumps. It is used to unload the rotor from an unbalanced axial force acting on its impellers. Moreover, this element, in addition to its main unload function, performs an additional function of the end seal, reducing the fluid pressure at the pump outlet from the discharge pressure to the suction pressure. The scheme of such typical balancing device is shown in Fig. 1. The force acting on the rotor is balanced by the hydrodynamic forces of the fluid pressure in the chamber 4 and in the throttle channel 3,which act on the rotatingdisk 5 (force F). Themain elements of the suchbalancingdevice are successive cylindrical throttle 1 and face throttle 3. Face throttle resistance varies with the gap variation under possible axial displacements of the rotor which are caused by change in the axial force T acting on the rotor. The latter ultimately provides a regulatory mechanism. At the same time, value of the face gap basically determines the leakage, which can be from 5 to 10% of the pump feed [1–3].

Probabilistic Approach to Determination of Dynamic Characteristics of Automatic Balancing Device