MULTI-STAGE TURBOCOMPRESSOR Russian patent published in 1999 - IPC

FIELD: compressing gas in impellers. SUBSTANCE: each impeller located in case of multi-stage sleeve-type radial turbo-compressor at opposite sense of rotation is followed by diffuser after which collector with tangential branch pipe is integrated mainly in outer case. Turbo-compressor has inner case with three impellers located inside it; bladeless diffuser section is located after each impeller in radial direction of outgoing flow; return blades are mounted after elbow in diffuser. Diameter of impellers are greatly reduced and ratio of diameter of bladeless diffuser section to diameter of impeller reaches D_RR/D₂≥1,6 (index RR stands for circular spaces and "2" is outlet impeller). Larger stage is provided with bladed section mounted after bladeless diffuser section which is fitted on larger diameter as compared with elbow of adjacent stage. Base is connected with inner case by means of bolted joint passed through area of bladed section of last stage. EFFECT: enhanced efficiency of turbo-compressor. 3 cl, 1 dwg