PSI - Issue 20

Nickolay Ovchinnikov / Procedia Structural Integrity 20 (2019) 113–118 Nickolay Ovchinnikov/ StructuralIntegrity Procedia 00 (2019) 000 – 000

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adversely affect their accuracy in determining the axial displacement of the rotor of the sectional pump, the result of which may be its further work during the rotor actually reaches a critical axial position. Simultaneous failure of the flow switch, ADSR, vibration and temperature sensors is an unlikely occasion. The flow switch is set in such a way that it automatically switches off the electric motor of the sectional pump at a critical decrease or critical increase in the value q. Critical values of q for pumps with different feed rates can be determined with a good degree of reliability, based on 2 author's empirical formulae (see Fig. 4, b). 4. Conclusion According to the results of the research conducted by the authors, the following conclusions can be drawn: 1) The most reasonable solution is to use heating of the rear bearing unit as a diagnostic sign of the sectional pump operation in case of critical axial displacement of the rotor in the underground mines of the Company, provided that it is accompanied by an increased or reduced flow of water in the discharge pipe, the quantitative changes of which can be monitored using vibration equipment; 2) The use of the flow switch will increase the sectional pumps durability of underground mines of the Company, as it will provide them with additional protection from operating in emergency conditions. The proposed technical solution to improvement of the operation lifetime of section pumps will be useful for engineers responsible for the operability of water drainage facilities of underground kimberlite mines of the Russian Federation. Originality and scientific novelty of the proposed technical solution are confirmed by patent « Electro pumping unit of section type » , RF Patent, no. 181078. References Fabian, S., Čačko , P. 2013. Experimental measurement and examination of independent and combined interaction of vibrodiagnostic and tribotechical methods. Applied Mechanics and Materials 308, 51 – 56. Janicki, G., Perzouvanis, A. Mason, B., Ebrahimi, M.K. 2014. Turbine blade vibration measurement methods for turbocharges. American Journal of Sensor Technology 2(2), 13 – 19. Ovchinnikov, N.P., Portnyagina, V.V., Sobakina, M.P. 2017. Dependence of the mean time failure a hydraulic balancing machine unit on different factors for sectional pumps of the Alrosa JSC. AIP Conference Proceedings 1915, 040043. Vikulov, M.A., Makhno, D.E., Ovchinnikov, N.P. 2017. Measurements of section pump of rotor axial position at Udachny mine. Advances in Engineering Research 133, 884 – 891 Yuan, H., Yang, W. Zhao, T., Liang, M. 2015. Effects of stator-rotor interaction on unsteady aerodynamic load of compressor rotor blades. Journal of vibroengineering 17(5), 2591 – 2608.