Філіпович, Ю. Ю. та Сунічук, С. В. та Filipovych, Yu. Yu. та Sunichuk, S. V. (2021) РОЗРАХУНОК ЧАСУ ЗАЛИВУ ВОДОЮ ВІДЦЕНТРОВОГО НАСОСА З УРАХУВАННЯМ ПОЗДОВЖНЬОГО ПРОФІЛЮ УСМОКТУВАЛЬНОЇ ТРУБИ. Вісник Національного університету водного господарства та природокористування (4(96)). с. 15-25.

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Анотація

Розроблено алгоритм розрахунку часу заливу відцентрового насоса автоматизованої насосної станції з допомогою вакуумної системи із урахуванням поздовжнього профілю усмоктувального трубопроводу, що дозволяє проводити розрахунки з конфігурацією трубопроводів практично будь-якої складності.

Title in English

CALCULATION OF FLOW TIME BY WATER OF THE CENTRIFUGAL PUMP TAKING INTO ACCOUNT THE LONGITUDINAL PROFILE OF THE SUCTION PIPE

English abstract

An algorithm for calculating the filling time of a centrifugal pump of an automated pumping station using a vacuum system taking into account the longitudinal profile of the suction pipeline, which allows calculations with the configuration of pipelines of almost any complexity. Reliable and sustainable operation of automated pumping stations depends on maintaining their main and auxiliary equipment in good condition, operation of pumps in high efficiency modes, compliance with pump flow control, implementation of automation and telemechanics. The use of vacuum systems is an effective type of bay and subsequent maintenance of flooded centrifugal pumps. A modern pumping station is a complex energy facility consisting of hydraulic, power and construction structures, hydromechanical and power equipment. Vacuum systems belong to the auxiliary equipment of the ANS, but ensure the smooth operation of the main pumping units, so the study of their technological processes is an urgent issue. The object of research is the time of filling the centrifugal pump of the automated pumping station with a vacuum system taking into account the longitudinal profile of the suction pipe, and the subject of research - the parameters of the suction pipe, the duration of the vacuum cycle and the influence of parameters of the vacuum installation. The method of experimental research was used in the study of technological processes of vacuum installations, and the methods of mathematical statistics, physical and mathematical modeling were used in the processing of the obtained materials. Determine the initial volume and mass of air in the vacuum system, and then, using the characteristics of the vacuum pump and data on the air sucked by the vacuum system, determine the amount of air pumped from the system and the mass of air remaining in the vacuum boiler and communications and the value of vacuum in system. According to Bernoulli's equation for unsteady pressure movement of uncompressed liquid in the suction line of the pump we find the increase in velocity in it during time Δt, the value of the velocity and the water level in the pipe. By repeating similar operations during a new round of calculations, we obtain a new value of the water level in the pipe. The calculations are carried out until the mark of the water level in the pipe becomes equal to the mark Zb or Zc.

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