Pavlenko I. Rising the reliability of the automatic balancing devices of the centrifugal machines

Thesis deals with scientific and technical problem of increase tightness and reliability of the automatic axial rotor-balancing devices of the centrifugal machines by applying the locking automatic balancing device as a complex hydromechanical automatic control system, which consists of two subsystems - traditional design and the regulator of pressure difference - and simultaneously performs the functions of the end seal and the hydrostatic bearing with self-adjusting gap and leakage. The reliability of traditional designs of automatic axial rotor-balancing systems was analyzed by mean time to failure for allowable leakages of the working environment, and developed a proposal to its increase by using the locking automatic balancing device. Mathematical models of the processes occurring in the modern designs of automatic axial rotor-balancing systems of centrifugal machines taking into account different modes of fluid flow in throttles are created. A technique and computer aided design program for locking automatic rotor balancing devices of multistage centrifugal pumps and compressors are designed to identify the relationship between the main parameters: the discharge pressure and the mechanical gap value and flow leakage, angular velocity and the amplitude of axial vibration of the rotor. Carried out a probabilistic analysis of the static, flow and amplitude frequency characteristics of automatic balancing systems and trusting areas were built. Experimentally determined coefficients of local hydraulic losses and friction losses along the length of the axial gap; conductivities of throttles by methods of the estimation theory were refined.