Calculation of the Characteristics of the Multi-gap Seal of the Centrifugal Pump, in Depend-ence on the Chambers' Sizes

Pozovnyi, Oleksandr; Zahorulko, Andriy; Krmela, Ján; Аrtyukhov, Аrtem; Krmelová, Vladimíra

doi:10.21062/mft.2020.048

Cited by 8 publications

(3 citation statements)

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“…This effect is especially significant in the presence of steep velocity and pressure gradients inherent in the small gaps of slotted seals, on which high pressure drops are throttled and one of the surfaces belongs to the rotor, which simultaneously rotates and vibrates [50,51]. In [52][53][54], the dynamic characteristics of slotted seals as intermediate supports were studied.…”

Section: Introductionmentioning

confidence: 99%

Methodology of Designing Sealing Systems for Highly Loaded Rotary Machines

Шевченко

Radchenko

et al. 2022

Sustainability

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Higher parameters of centrifugal machines are constantly required, such as the pressure of the medium to be sealed and the speed of rotation of the shaft. However, as the parameters increase, it becomes more and more difficult to ensure the effectiveness of sealing. In addition, sealing systems affect the overall safety of equipment operation, especially vibration. In order to harmonize the sealing functions and increase the dynamic rigidity of the rotors of centrifugal machines, a method for modeling complex sealing systems has been developed. Non-contact seals are considered as hydrostatic–dynamic bearings that can effectively dampen rotor oscillations. A general approach to the analysis of non-contact seals as automatic control systems and an algorithm for constructing their dynamic characteristics at the design stage were proposed for the first time. Models of “rotor-gap seal”, impulse seal and “rotor–hydraulic face” systems, and seal-supports of a shaftless pump have been studied to assess the effect of these seal systems on the oscillatory characteristics of the rotor. Analytical dependencies are obtained for calculating the dynamic characteristics and stability limits of seals as hydromechanical systems. The directions for improving the safety of operation of critical pumping equipment due to a targeted increase in the rigidity of non-contact seals are determined, which leads to an increase in the vibration resistance of the rotor and the environ-mental safety of centrifugal machines. The paper proposes a method for designing sealing systems based on the configuration of sealing components in order to achieve harmonization between sealing and vibration reliability, taking into account oscillatory processes due to hydrodynamic sealing characteristics.

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Section: Introductionmentioning

confidence: 99%

Methodology of Designing Sealing Systems for Highly Loaded Rotary Machines

Шевченко

Radchenko

et al. 2022

Sustainability

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“…Modern approaches in the field of linear and non-linear rotor dynamics and their practical applications are presented in [8][9][10][11][12]. Yashchenko et al [8] provide an assessment of segment bearing stiffness with the balancing procedure for flexible rotors of turbocharge units in the accelerating-balancing stand.…”

mentioning

confidence: 99%

“…Application of the finite element analysis for stiffness and critical speed calculation of a magnetic bearing-rotor system for electrical machines was described in [10]. A phenomenon of subharmonic resonance of a symmetric ball bearing-rotor system is investigated in [11]. Pavlenko et al [12] propose models for investigation of critical frequencies of the centrifugal compressor rotor that considers non-linear stiffness characteristics of bearings and seals.…”

mentioning

confidence: 99%

Research on Improving Seals to Suppress Vibration of Rotary Machines

Lu,

Shevchenko,

Geichuk

et al. 2024

C. R. Acad. Bulg. Sci.

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There is a constant demand for higher equipment parameters, such as pressure of a sealing medium and shaft rotation speed. However, as the parameters rise it becomes more difficult to ensure hermetization efficiency. Moreover, sealing systems affect the overall operational safety of the equipment, especially vibratory. Non-contact seals are considered hydrostatodynamic supports that can effectively damp rotor oscillations. Models of an impulse and a groove seals, models of rotor-seals system and rotor-auto-unloading system, models of a shaftless pump are studied to evaluate the effect of these sealing systems on oscillatory characteristics of rotor. Analytical dependencies for computation the dynamic characteristics of impulse seals, hydromechanical systems rotor-seals and rotor-auto-unloading, as well as shaftless pumps are obtained. These dependencies describe the radial-angular vibrations of a centrifugal machine rotor in seals-supports. Equations for computation the amplitude-frequency characteristics are given. The directions of improving the environmental safety of critical pumping equipment by purposefully increasing the rigidity of non-contact seals that leads to higher rotor vibration stability have been determined.

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