US 12,290,824 B2
Solid bowl screw centrifuge with mixing blades or paddles arranged on the screw shaft
Poul-Erik Aagaard, Sporup (DK)
Assigned to GEA Mechanical Equipment GmbH, Oelde (DE)
Appl. No. 17/607,124
Filed by GEA MECHANICAL EQUIPMENT GMBH, Oelde (DE)
PCT Filed Apr. 24, 2020, PCT No. PCT/EP2020/061505
§ 371(c)(1), (2) Date Oct. 28, 2021,
PCT Pub. No. WO2020/221668, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 10 2019 110 996.5 (DE), filed on Apr. 29, 2019.
Prior Publication US 2022/0234053 A1, Jul. 28, 2022
Int. Cl. B04B 1/20 (2006.01); B04B 11/02 (2006.01)
CPC B04B 1/20 (2013.01) [B04B 11/02 (2013.01); B04B 2001/2041 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A solid bowl screw centrifuge, comprising:
a housing;
a rotor rotatably mounted in the housing;
a rotatable drum having a rotational axis, wherein the rotatable drum has a cylindrical section having a length L1 and a conical section having the length L2;
at least one first feed configured to supply a suspension to be processed into the rotatable drum;
at least one liquid drain arranged in the cylindrical section of the rotatable drum;
at least one solid discharge arranged in the conical section of the rotatable drum;
a screw having windings and a screw shaft, wherein the screw is rotatable relative to the rotatable drum at a differential speed and is arranged in the rotatable drum, wherein the rotatable drum and the screw jointly form the rotor;
a second feed configured to supply an additive to a solid phase inside the rotatable drum, wherein the second feed is arranged coaxially to the rotational axis, and wherein the second feed protrudes into an interior of the screw shaft opposite to the at least one first feed;
a line radially extending from the second feed in a direction of a casing of the rotatable drum, wherein the line is configured to deflect the additive, and wherein the line has an orifice opening located in a region between the screw shaft and the casing of the rotatable drum; and
mixing blades or mixing paddles, in addition to the windings of the screw, are arranged along a wall of the screw shaft.