Abstract
A literature review was conducted to develop an experimental stand for testing pumps. It was established that frequency regulation is one of the quantitative energy-saving methods of controlling the operation of the pumping unit. At the same time, the influence on the pump unit is carried out by changing the operating point by means of variable pump curve. The hydraulic schemes for experimental study of frequency-controlled pumps presented in the article have certain disadvantages: 1) the location of the pump relative to the tank is ambiguous regarding the operation of the pump under flooded suсtion; 2) pressure regulation is provided only in the direction of its decrease; 3) refers rather to the automation of pumping installations. On the designed and manufactured experimental stand, it is possible to study the operation of the pump with the use of a frequency converter and without it, through a bypass line. When testing the pump for systems that operate according to the fluid level in the suction tank, use either a valve on the discharge pipeline (with the use of a frequency converter) or a ball valve on the discharge pipeline from the discharge tank (without the use of a frequency converter). In addition, pump testing using a frequency converter can be performed for pressure-operated systems. The installed frequency converter is a regulator of the flow of the working fluid, which allows adjusting of the pump discherge. The pump designed on the experimental stand is a self-suction jet that does not need to be installed under flooded suсtion. The discharge tank is located higher than the suction tank, which ensures the circulation of the working fluid by gravity. The working fluid will be water. The preliminary results, performed on the experimental stand, confirm the possibility of frequency regulation of the pump using a frequency converter.
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