CENTRIFUGAL SCREW PUMP Russian patent published in 2011 - IPC F04D1/04 F04D29/06 

FIELD: engines and pumps.

SUBSTANCE: pump consists of housing 2, rotor 1 with impeller 3 of two-sided inlet with cavity 4 in sleeve, which is installed on the shaft. Screws of constant or variable pitch of blades are installed in front of inlet of impeller 3. Rotor 1 is installed in slide bearings 9, 10 consisting of sleeve installed in housing and jacket 11 fixed on the shaft. Cavity 4 in sleeve of wheel 3 is connected by means of holes 5 to channels 6 of wheel 3. In the shaft there is drilled hole 7 that is connected to cavity 4 of wheel 3 for liquid supply to bearings 9, 10 and to cavities of bearings 9, 10 by means of holes 8. Sleeve and/or jacket 11 on the shaft has fine irregularities for example in the form of dimples.

EFFECT: development of centrifugal screw pump having bearings with increased service life, increased efficiency value of pump at use of simpler design of slide bearings, which is lubricated with purified pumped liquid.

1 dwg