INVARIANT SYSTEM OF AUTOMATIC STABILIZATION OF LIQUID FLOW RATES WITH PRESSURE VARIATION IN THE PIPELINE

Abstract

The aim of the work is the development of an invariant system of automatic stabilization of liquid flow rates with a relative error not exceeding ± 1,0%, during fluctuations in pressure in the supply main with simultaneous reduction of its dimensions and material consumption. The research methods used in the work are as follows: methods of the hydraulics theory; methods of the automatic control theory; methods of analysis; modelling methods; methods of the theory of errors, methods of probability theory and mathematical statistics. Academic novelty lies in the fact that for the first time an invariant system of automatic stabilization of liquid flow compensates the negative influence of pressure fluctuations in the main line and, thus, provides high accuracy of functioning, is realized. Practical significance of the performed studies is high, since the obtained results make it possible to stabilize the flow of water into the sand chute of a mechanical single-spiral classifier quite simply and with sufficient accuracy. It allows to stabilize the pulp discharge in a ball mill and significantly improve the efficiency of its operation. The invariant system of automatic stabilization of the liquid flow rate contains a vertical uniflow hydraulic converter, an input pipe and a cylindrical float, which serves as a regulator. The system provides a water flow of 24,3 m3/h with a relative error of ± 0,85%.