AXIAL-MIXED-FLOW INCLINED ARCHIMEDEAN SCREW PUMP Russian patent published in 1997 - IPC

FIELD: manufacture of pumps. SUBSTANCE: pump has housing 1 with supply branch pipe 2 and discharge branch pipe 3, screw wheel 6 with helical blades 7 and bush 8 secured on shaft 5; bush 8 forms unloading chamber 10 together with discharge branch pipe 3. Screw wheel is made on outer surface described by blades during rotation in form of cylindrical section 13 at inlet 11 and cylindrical section 14 at outlet 15 and taper section 16 connecting cylindrical sections 13 and 14 at inlet 11 and outlet 15. Housing 1 is provided with cylindrical section 18 at inlet 11 and cylindrical section 18 at outlet 15, as well as with taper section 19 interconnecting sections 17 and 18. Helical blades 7 have variable pitch; inlet 20 and discharge branch pipe 3 are axial. Diameter of seal 9 on bush 8 is equal to 0.9-1.1 of outer diameter of helical blades 7 at inlet 11. EFFECT: enhanced reliability. 3 cl, 2 dwg