CENTRIFUGAL SCREW PUMP Russian patent published in 2005 - IPC

FIELD: slotted seals for centrifugal screw pumps of turbo-pumping units of liquid-propellant rocket engines.

SUBSTANCE: proposed centrifugal screw pump has housing 1, inlet branch pipe 2, centrifugal impeller 3, screw 11, floating rings 6 and front sealing bead 4 of impeller 3. Bead 4 of impeller 3 is provided with additional slotted seal behind main slotted seal 7. Additional cavity hydraulically communicated with inlet of branch pipe 2 by means of pipe line 10 is made between slotted seals in inlet branch pipe 2 at level of main slotted seal. Such construction of slotted seal excludes penetration of hot jet from under slotted seal to cavity between screw II and centrifugal impeller 3, thus excluding harmful effect of this jet on physical properties of liquid and on curve of velocities at inlet of centrifugal impeller 3. This effect is clearly defined for cryogenic fluids.

EFFECT: increased cavitation and power characteristics of pump.

6 dwg