VIGO SMIT Company

Moscow, Russia

VIGO SMIT Company

Moscow, Russia

Time filter

Source Type

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.


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


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.


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.


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


Mel'nik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2013

Floating rings are widely used in the sealing assemblies of the shafts of pumps and turbine pump units. However, information about the use and design of floating rings is not widely available in the literature and does not satisfy the practical interest in their use. The article touches on questions related to the operating mechanism of seal assemblies with floating rings and the structural realization of these assemblies, and considers questions related to their design. The potential of the computational method in the use of the traditional approach to the calculation of the flow through a seal and the input losses in a groove channel is analyzed and a technique of improving the computational method is proposed. © 2013 Springer Science+Business Media New York.


Mel'nik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2015

Information on fluid pressure distribution pattern at slot seal channel inlet is given, and a mathematical equation is proposed for its description. A simplified procedure for calculating radial forces in a nonaxisymmetric annular slot seal channel, which takes account of both the asymmetry of pressure distribution at slot channel inlet and the pattern of its change along the length of the inlet section of the channel, is given. © 2015, Springer Science+Business Media New York.


Questions concerning the effect of a number of factors on leakage through a slotted seal (slot-hole gap, length of the channel, viscosity of the medium, non-coaxiality between the axis of the shaft and case plug) are considered. An expanded graphical relationship is cited for determination of a non-rotating shaft. The method of discharge constants can also be used to determine leakages of a medium with a viscosity differing from the base value. © 2015, Springer Science+Business Media New York.


Mel'nik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2015

Questions concerning the influence of shaft rotation on the flow rate of a medium though the channel of a slotted seal are considered. A method is proposed for assessment of the effect of shaft rotation on the magnitude of leakage through the slotted seal, considerably simplifying calculations. © 2015 Springer Science+Business Media New York


Melnik V.A.,VIGO SMIT Company
Chemical and Petroleum Engineering | Year: 2012

A method based on determination of integral values of local pressure losses associated with potential flow velocity of a fluid in a smooth slot seal channel is proposed for calculating radial forces in slot seals in a case where the axes of the shaft and housing bushing of the seal assembly are eccentric. It differs from the well-known Lomakin calculation method based on differential calculation of local losses in terms of the flow rate of the fluid through the seal assembly. The proposed method can be used to simplify solution of the problem and to enhance the accuracy of calculations. © 2012 Springer Science+Business Media, Inc.

Loading VIGO SMIT Company collaborators
Loading VIGO SMIT Company collaborators