DOI: https://doi.org/10.15587/1729-4061.2020.206721

Development of pulse mechanical seal calculation methods on the basis of its physical model construction

Sergey Shevchenko, Alexander Chernov

Abstract


A physical model was constructed for a pulse mechanical seal as a system for automatically controlling the end clearance.

The effect of pulse compaction parameters on static characteristics was studied. The analysis of static characteristics revealed the influence of the design parameters of pulse compaction on the size of the end clearance and the flow rate of the fluid being sealed. Conclusions were made about the influence of the load factor and the efforts of the preliminary compression of the springs on the static characteristics of pulse compaction. The static calculation helped determine the coefficient of hydrostatic stiffness, the condition of static stability, and the range of permissible sealing pressures.

The factors affecting the dynamic characteristics of the seal were determined. Dimensional values of the amplitudes of the forced axial vibrations of the ring were estimated at any rotation frequency. Expressions of the amplitude and phase frequency characteristics were obtained, which made it possible to identify dangerous regions of rotational frequencies and select the sealing parameters so that the amplitudes of the forced axial vibrations of the ring could not go beyond the limits of dynamic stability. It was revealed that the stability region expands due to a decrease in the volume of the chambers and a decrease in the coefficient of hydrostatic stiffness.

A method for the analytical calculation of pulse mechanical seals was proposed to make it possible to calculate the geometry of the seal at the design stage. The study offers an example of engineering calculations for a pulse mechanical seal as well as the design of a sealing assembly developed by the proposed method

Keywords


pulse mechanical seal; static characteristics; amplitude and phase characteristics; dynamic stability

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Copyright (c) 2020 Sergey Shevchenko, Alexander Chernov

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ISSN (print) 1729-3774, ISSN (on-line) 1729-4061