OPTIMISATION METHOD OF GEOMETRIC PARAMETERS OF SIDE SEMI-SPIRAL SUPPLY OF CENTRIFUGAL PUMP OF TWO-SIDED INLET Russian patent published in 2014 - IPC F04D29/44 

FIELD: machine building.

SUBSTANCE: in an optimisation process of geometric parameters of side semi-spiral supply of a centrifugal pump of a two-sided inlet there specified is design supply; an average moment of speed at an impeller inlet, a rotation frequency and a radius of the impeller, as well as a law of variation of width of the section of the spiral supply part depending on variation of radius of its section. The carrying capacity of the supply is determined on their basis; a design section of its spiral part is shaped; intermediate sections of the spiral part are shaped considering the angle of contact of the spiral part. The obtained parameters of width of design and intermediate sections are reduced by 15-20%; an outlet radius of the impeller is increased by the value of up to 1%; an angle of contact is increased up to 200…210° and a shape of the cross section of the tongue is changed, thus making it smoothly converging from periphery to the centre of the impeller and a confuser section.

EFFECT: improving uniform distribution of speeds and their moments at the outlet of the supply to the impeller, which allows improving the impeller liquid inlet conditions and reducing cavitation, as well as increasing the efficiency of the pump owing to reducing supply energy losses.

2 cl, 10 dwg