SELF-PRIMING CENTRIFUGAL PUMP Russian patent published in 1999 - IPC

FIELD: mechanical engineering; pumps. SUBSTANCE: self-priming centrifugal pump has impeller 4, guide vane assembly 7, housing 1, pressure branch pipe 2 and suction branch pipe 3. Guide vane assembly 7, connected with housing 1 and suction branch pipe 3, is made in form of ring 8 with cover disk 9 to separate space of impeller 4 from pump pressure space 12. Pressure and suction branch pipes 2, 3, respectively, are arranged on housing 1 higher than impeller 4. Lower area of pressure space 12 is connected by channels 13 with space 10 formed by radial clearance between outer diameter of impeller 4 and inner diameter of ring 8 of guide vane assembly 7. Separating ring 17 is installed axially symmetrically between guide vane assembly 7 and housing 1. This ring separates part of lower area of pressure space 12 to which channels 13 are connected. Local radial clearance expansion zones between inner diameter of ring 8 and outer diameter of impeller 4 are made on inner surface of ring 8 of guide vane assembly 7 between transferred medium let out channels. Such design of pump improves conditions of air intake and building of liquid-air mixture by impeller, at suction only, by use of fixed members if simple design which do not required special control. EFFECT: enhanced reliability and improved performance characteristics of pump. 3 cl, 4 dwg