MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 1999 - IPC

FIELD: oil production. SUBSTANCE: pump has housing 1 with set of guide apparatuses 2 and shaft 3 with working wheels 4. Working wheels 4 are arranged on shaft in turn with protective bushings 5. Intermediate bearing supports of shaft 3 are placed between pump stage groups. Each wheel is installed for axial displacement and rests through ring support 7 of lower disk 6 onto apparatus 2 arranged below or onto intermediate support made of two ring U-shaped section parts 8 and 9 telescopically mated in opposition to each other and to holes 12 and 13 in their bases 10 and 11. Inner sides 19 and 21 support parts pointed to shaft 3 and bushings 5 beneath form ring space accommodating flexible plastic material 23, for instance, fluoroplastic, in form of one solid cup or in form of group of cups forming equilateral trapezium in section. EFFECT: prevention of intensive wear of pump members caused by vibration and longitudinal bending of rotating long-cut dynamically unbalanced part, such as pump shaft. 1 dwg