Entity

Time filter

Source Type

Moscow, Russia

This paper presents computational relationships derived on the basis of solution of Reynolds equations for a layer of lubricant, which are required for design of the slotted seals of a stepped channel in a laminar-flow regime. Relationships are derived for determination of the pressure curve, and also the flow rate of medium in the stepped channel for steps of various dimensions with respect to the radial and longitudinal coordinates. Qualities of the geometry of the stepped channel are analyzed, and design recommendations are given for selection of the dimensions and shape of the slotted channel. Illustrations of the pattern of the pressure curves, and also leakage are presented for a typical series of effective gaps in the slotted seal. The solutions obtained are applicable for analyses of sealing subassemblies for the flow of a medium in stepped channels. This shape of channels is employed in slotted seals or sliding ring-oil bearings. © 2011 Springer Science+Business Media, Inc. Source


Melnik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2011

The design of a contactless seal for use in collars of pump impellers of high-speed units is described. A cup with an unconventional scheme of loading and deforming (straining) of the cup body has been used in the design of the seal unit. At low differential pressures, the cup seal functions as a conventional cup seal, but at high differential pressures it turns into a slit seal. The maximum positive effect in terms of influence on the dynamic characteristics of the rotor is achieved at fixed ratios of the dimensions of the deformed cup and parts that form the seal unit. The data obtained by comparative experimental study of the cup-slit and conventional seal units are provided. Use of cup-slit seals having fluoroplastic (Teflon) cups in oxygen pumps will help reduce expenditures for finding a solution to the problem of safe operation of such pumps. © 2011 Springer Science+Business Media, Inc. Source


Questions related to the selection and application of theoretical or empirical methods for the calculation of the parameters of the groove seals of shafts widely used in pumps and compressors are considered. A theoretical method of calculation through the compilation and solution of a system of equations that describe the flow of a medium in the channel of a groove seal is successfully applied for the case of a laminar regime of flow of a medium in a channel. It is not possible to describe such flow by means of a closed system of equations in the case of a turbulent regime of flow of a medium in the channel of a groove seal. The new theoretical method of determining the unknown parameters of the turbulent flow of a medium in annular groove seals, which is related to the solution of the Martsinkovskii equation, may serve only as a tool for studying the nature of the processes that occur in a groove seal. Thus, empirical methods based on Bernoulli’s equation and the data of experimental investigations are still the only reliable tool for calculating the characteristics of groove seals in the case of a turbulent regime of flow of a medium. © 2014 Springer Science+Business Media New York Source


Mel'nik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2014

It is proposed that all structural solutions of seal couplings employed in modern practice for the shafts of rotary machines be divided into the following four groups: contact, contact-grooved, non-contact-grooved, and plate. Applicability parameters of all couplings designed for shaft seals are described. Their advantages and disadvantages are noted. © 2014 Springer Science+Business Media New York. Source


Mel'nik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2016

Questions related to the calculation of radial forces in the channel of the groove seal of a rotor for a rotating and for a nonrotating shaft where the pressure drop at the inlet to the grooved channel is asymmetric in the circumferential direction are considered. A method of estimating the magnitude of the radial force in a groove seal suitable for practical calculations is proposed. © 2016 Springer Science+Business Media New York Source

Discover hidden collaborations