TWO-STAGE CENTRIFUGAL PUMP Russian patent published in 2019 - IPC F04D1/06 F04D29/41 F04D29/42 

FIELD: engines and pumps.

SUBSTANCE: invention can be used in thermal control systems of aviation and rocket equipment. Two-stage centrifugal pump includes housing (1), shaft (4) arranged in housing (1) installed on bearings (5), and two bushings (6, 7) fixed relative to housing. One of two working wheels (10, 11) fixed on shaft (4) is arranged in recesses (8, 9) of each of bushings (6, 7). Output (14) of first wheel (10) through transfer channel (15) is interconnected with input (16) of second wheel (11). Cylindrical bore (17) is made in housing (1). In bore (17) there are two bushings (6, 7) and insert (18) between them. Bores (17) of both bushings (6, 7) face insert (18). Wheels (10, 11) face their inputs (19, 16) in opposite directions from insert (18). Bearings (5) are located in inner cavity (20) of insert (18). Transfer channel (15) is made on outer surface (21) of insert (18) with outlet to both ends (22, 23), on the closest to insert (18) end (24) of sleeve (6) enclosing wheel (10), as well as on outer surface (25) and on end (26) of sleeve (7) enclosing wheel (11) on opposite end of insert (18).

EFFECT: invention is aimed at increasing service life and reducing axial dimensions.

1 cl, 3 dwg