Solid-bowl screw centrifuge with outlet openings for partial and residual emptying of the drum

1. A solid-bowl centrifuge comprising:

a drum rotatable about a horizontal axis of rotation;

a screw arranged in the drum;

a continuous solids discharge located at a first end of the drum;

a continuous liquid discharge located at a second, opposite end of the drum;

at least one discontinuously acting outlet opening including a closure device located on a radially outermost lateral surface of the drum;

the closure device including a ring located on the radially outermost lateral surface of the drum and configured to be axially displaced along the radially outermost surface of the drum relative to the horizontal axis of rotation and rotatable with the drum during an operation of the centrifuge; and

an actuating device assigned to the closure device by which actuating device the ring is displaced into a first position which opens the at least one outlet opening and into a second position which closes the at least one outlet opening.

2. The solid-bowl screw centrifuge according to claim 1 , wherein the actuating device is a fluidic actuating device.

3. The solid-bowl screw centrifuge according to claim 1 , wherein the actuating device is a hydraulic actuating device.

4. The solid-bowl screw centrifuge according to claim 1 , wherein the at least one outlet opening is arranged axially before the continuous liquid discharge.

5. The solid-bowl screw centrifuge according to claim 1 , wherein the at least one outlet opening lies radially outside the screw.

6. The solid-bowl screw centrifuge according to claim 1 , wherein the at least one outlet opening is formed in an end region of a drum lateral surface which faces a drum lid.

7. The solid-bowl screw centrifuge according to claim 6 , wherein the drum lateral surface, at its axial end before the drum lid, includes a radially protruding collar having a step, and the at least one outlet opening is formed in a region including the step.

8. The solid-bowl screw centrifuge according to claim 6 , wherein a hydraulic chamber is formed one of on and in the drum lid.

9. The Solid-bowl screw centrifuge according to claim 8 , wherein the drum lid has an internally conical design, and the hydraulic chamber is formed at an outer circumference of the drum lid.

10. The solid-bowl screw centrifuge according to claim 8 , wherein the hydraulic chamber includes an opening chamber and a closure chamber which are operatively connected.

11. The solid-bowl screw centrifuge according to claim 10 , wherein the opening chamber includes an opening, which opening leads outward from the hydraulic chamber out of the drum to discharge hydraulic fluid from the hydraulic chamber.

12. The solid-bowl screw centrifuge according to claim 8 , wherein the ring includes a radial attachment extending into the hydraulic chamber, and a hydraulic conduit opens into the hydraulic chamber.

13. The solid-bowl screw centrifuge according to claim 12 , wherein the hydraulic conduit passes through the drum lid and an adjoining part and is operatively connected to another hydraulic conduit on a non-rotating feed pipe.

14. The solid-bowl screw centrifuge according to claim 8 , wherein the hydraulic chamber, in a region located remote from the drum, is closed by a ring secured to the drum lid.

15. The solid-bowl centrifuge according to claim 1 , wherein the at least one discontinuously acting outlet opening is formed as an aperture in the form of a slot or a hole.

16. A solid-bowl centrifuge comprising:

a drum rotatable about a horizontal axis of rotation the drum having a drum lid at an end thereof;

a screw arranged in the drum;

a continuous solids discharge located at a first end of the drum;

a continuous liquid discharge located at a second, opposite end of the drum;

at least one discontinuously acting outlet opening including a closure device located on a radially outermost lateral surface of the drum lid;

the closure device including a ring located on the radially outermost lateral surface of the drum lid and configured to be axially displaced along the radially outermost surface of the drum lid relative to the horizontal axis of rotation and rotatable with the drum during an operation of the centrifuge;

an actuating device assigned to the closure device by which actuating device the ring is displaced into a first position which opens the at least one outlet opening and into a second position which closes the at least one outlet opening; and

wherein the at least one outlet opening is formed in the drum lid.

17. The solid-bowl screw centrifuge according to claim 16 , wherein the drum lid includes a radially projecting collar having a step.