HYDRAULIC EQUIPMENT Russian patent published in 2002 - IPC

FIELD: hydraulic equipment; pumps. SUBSTANCE: invention relates to hydraulic equipment, such as centrifugal or like pumps providing maintenance of constant flow velocity irrespective of resistance of pipes. proposed hydraulic equipment designed for building pressure by rotating working wheel by means of motor has frequency converter to supply power to electric motor, frequency and current value detector and program for preliminary determination of relation between frequency and current values and comparing the values in process of operation with values set by program. Frequency converter is made for changing frequency generated by frequency converter to bring working point of hydraulic equipment to value defined by program. Invention is aimed at creating which does not require special means to provide constant velocity of flow irrespective of changes of pipe resistance. EFFECT: improved reliability in operation and enlarged operating capabilities. 10 cl, 5 dwg _