ЭНЕРГЕТИЧЕСКОЕ ВЗАИМОДЕЙСТВИЕ ГИДРАВЛИЧЕСКИХ ПАРАМЕТРОВ ВСАСЫВАЮЩИХ И НАПОРНЫХ ЛИНИЙ ГИДРАВЛИЧЕСКОГО ОБОРУДОВАНИЯ НАСОСНЫХ СТАНЦИЙ

Abstract

When pumping equipment transporting liquid to the hydraulic network is operating, the flow rate, pressure losses, total energy, all these parameters are directly related to the efficiency value and the pressure line, and the entire fluid supply process is pulsating, there are practically no recommendations on this issue in modern literature. Methods. The paper presents the effect of the total energy of the pressure line on the hydraulic parameters of the suction line: - the effect of total energy on the hydraulic parameters of the suction line when the sampling points are changed by the consumer; - the influence of the hydraulic parameters of the pressure line on the permissible vacuum-metric suction height of hydraulic equipment. As a result of the analysis of the above dependencies, it shows that when the flow sampling points are changed by consumers, the hydraulic parameters of the pressure pipeline and, accordingly, the hydraulic parameters of the suction pipeline change under the condition of a constant value of H_г^2. The main results. Based on the analysis of the above table, it was found that with a constant value of the suction height Hгв = 3 m, the operation of the above example with a pump K90/85 is possible in one case, with a calculated excess of the permissible vacuum suction height H_доп^вак = 3,4 m above the value of the total energy in the suction pipeline Э1=3,8m on 0,4m. In other operational variants, the geometric suction height of the Hгв is unacceptably small, which leads to a complete cessation of supply. The novelty of the work. Calculation of the parameters of the K90/85 pump, the example given, can serve as an analogue of the calculation for all categories of centrifugal pumping equipment with a positive suction height. Conclusions. In the calculations of the pump head, it should be borne in mind that when the points of consumer consumption selection change and, accordingly, the total energy change, the pump head for each subsequent point should be calculated taking into account the decrease in the calculated difference in total losses and the high-speed head of the suction and pressure lines Δhв.