PERIPHERAL MULTISTAGE PUMP Russian patent published in 2002 - IPC

FIELD: aircraft; starting pumps of fuel systems. SUBSTANCE: pump has housing with working chamber in which vortex wheel is installed on drive shaft. Wheel is made in form of disk with two rows of blades fitted on side surfaces of disk over different radius circumferences, with blades arranged on peripheral surface of disk. Pump has two fixed ring disks installed with clearance at both sides of wheel. Disks are provided with cavities on side surfaces pointed to wheel and located opposite to corresponding rows of wheel blades. Cavities are connected with channels to feed and let out handled liquid. Blades of wheel are installed in ring cavities forming, together with corresponding cavities of fixed disks, two stages of peripheral pump. Stage arranged closer to drive shaft is connected by inlet with handled liquid feed channel, and by outlet, with inlet of second stage remote from drive shaft. Outlet of second stage is connected by channels with ring clearance located between peripheral surface of vortex wheel provided with blades and housing of pump, thus forming third stage of pump. Third stage is connected with channel to let out handled liquid. EFFECT: increased head at reduced radial and axial loads on wheel. 8 cl, 14 dwg