Pusher centrifuge

• US 20040206688A1
• Filed: 04/05/2004
• Published: 10/21/2004
• Est. Priority Date: 04/16/2003
• Status: Active Grant

• Current Assignee: Ferrum AG
• Original Assignee: Ferrum AG
• Inventors: Geiger, Roy, Reinach, Harald
• Granted Patent: US 7,032,759 B2
• Time in Patent Office: Days
• US Class Current: 210/369
• CPC Class Codes: B04B 11/06 Arrangement of distributors or collectors in centrifuges
• CPC Class Codes: B04B 3/02 discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges

Abstract

The invention relates to a pusher centrifuge (1) for the separation of a mixture (2) into a solid cake (3) and into a liquid phase (4). The pusher centrifuge (1) in accordance with the invention includes an outer screen drum (6) rotatable about an axis of rotation (5), a mixture distributor (7) arranged in the screen drum (6) with a pusher base apparatus (8) and an infeed device (9), with the pusher base apparatus (8) being arranged and designed such that the solid cake (3) is displaceable by means of the pusher base apparatus (8) and the mixture (2) can to be introduced by the infeed device (9) via the mixture distributor (7) into an empty space (R) which arises on the displacement of the solid cake (3) by the pusher base apparatus (8). The mixture distributor (7) includes at least one funnel (10) for the pre-acceleration of the mixture (2), with the funnel (10) being rotatably arranged about a drive axis (11) and being rotatable at a pre-settable speed of rotation about the drive axis (11) by means of a drive (12).

Claims

1. A pusher centrifuge for the separation of a mixture (2) into a solid cake (3) and into a liquid phase (4), including an outer screen drum (6) rotatable about an axis of rotation (5), a mixture distributor (7) arranged in the screen drum (6) with a pusher base apparatus (8) and an infeed device (9), with the pusher base apparatus (8) being arranged and designed such that the solid cake (3) is displaceable by means of the pusher base apparatus (8) and the mixture can be introduced by the infeed device (9) via the mixture distributor (7) into an empty space (R) which arises on the displacement of the solid cake (3) by the pusher base apparatus (8), with the mixture distributor (7) including at least one funnel (10) for the pre-acceleration of the mixture (2), characterised in that the funnel (10) is rotatably arranged about a drive axis (11) and is rotatable at a pre-settable speed of rotation about the drive axis (11) by means of a drive (12).

2. A pusher centrifuge in accordance with claim 1, wherein the mixture distributor (7) includes an inlet funnel (101) for the pre-acceleration of the mixture (2) which extends at a substantially constant opening angle (α

) in a conically divergent manner in the direction towards the pusher base apparatus (8).

3. A pusher centrifuge in accordance with claim 1, wherein the inlet funnel (101) has a curved extent and the opening angle (α

) of the inlet funnel (101) becomes larger in the direction towards the pusher base apparatus (8).

4. A pusher centrifuge in accordance with claim 1, wherein the inlet funnel (101) has a curved extent and the opening angle (α

) of the inlet funnel (101) becomes smaller in the direction towards the pusher base apparatus (8).

5. A pusher centrifuge in accordance with claim 1, wherein the mixture distributor (7) includes a pre-acceleration funnel (102) which extends at a substantially constant pre-acceleration angle (β

) in a conically divergent manner in the direction towards the infeed device (9).

6. A pusher centrifuge in accordance with claim 1, wherein the pre-acceleration funnel (102) has a curved extent and the pre-acceleration angle (β

) of the pre-acceleration funnel (102) becomes larger in the direction towards the infeed device (9).

7. A pusher centrifuge in accordance with claim 1, wherein the pre-acceleration funnel (102) has a curved extent and the pre-acceleration angle (β

) of the pre-acceleration funnel (102) becomes smaller in the direction towards the infeed device (9).

8. A pusher centrifuge in accordance with claim 1, wherein the inlet funnel (101) is rotatably arranged about a drive axis (111) and is rotatable at a pre-settable speed of rotation about the drive axis (111) by means of a drive (121).

9. A pusher centrifuge in accordance with claim 1, wherein the pre-acceleration funnel (102) is designed and arranged such that the pre-acceleration funnel (102) is rotatable at a pre-settable speed of rotation about an axis of rotation (112) by means of a rotational drive (122).

10. A pusher centrifuge in accordance with claim 1, wherein the inlet funnel (101) is made as a pre-filter screen (1011) for the pre-separation of liquid phase (4) from the mixture (2).

11. A pusher centrifuge in accordance with claim 1, wherein the pre-acceleration funnel (102) is designed as a pre-acceleration screen (1021) for the pre-separation of liquid phase (4) from the mixture (2).

12. A pusher centrifuge in accordance with claim 1, wherein the pre-filter screen (1011) and/or the pre-acceleration screen (1021) is designed as a two-stage screen with a coarse screen and a fine screen.

13. A pusher centrifuge in accordance with claim 1, wherein collection means (13) are provided for the collection and draining of the liquid phase (4) from the pre-filter screen (1011) and/or from the pre-acceleration screen (1021).

14. A pusher centrifuge in accordance with claim 1, wherein the pre-filter screen (1011) is arranged at a screen stage (14) and/or at the screen drum (6).