Apparatus for additively manufacturing three-dimensional objects

1. An apparatus for additively manufacturing three-dimensional objects through successive layerwise selective irradiation and consolidation of layers of a powdered build material which can be consolidated by means of an energy beam, the apparatus comprising:

a process chamber;

a stream generating device configured to generate a gaseous fluid stream at least partly streaming through the process chamber, the gaseous fluid stream adapted to remove a non-consolidated particulate build material while streaming through the process chamber, wherein the stream generating device comprises:

a first stream generating unit comprising a first pumping device; and

a second stream generating unit comprising a second pumping device, wherein the second stream generating unit and the first stream generating unit are disposed in parallel and are configured to co-act to generate the gaseous fluid stream;

wherein the first and second stream generating units are disposed in a streaming channel structure extending off the process chamber and wherein the streaming channel structure comprises a branching section branching the streaming channel structure in at least two streaming channel branches, whereby the first stream generating unit is disposed in a first streaming channel branch and the second stream generating unit is disposed in a second streaming channel branch; and

a filtering device disposed in between the process chamber and the stream generating device.

2. The apparatus according to claim 1 , wherein each of the first and second stream generating units is a suction pumping device or comprises at least one suction pumping device.

3. The apparatus according to claim 1 , wherein the first and second stream generating units are operated in parallel.

4. The apparatus according to claim 1 , wherein the streaming channel structure extends between a process chamber gas outlet and a process chamber gas inlet, wherein the filtering device is configured to filter the non-consolidated particulate build matter from the gaseous fluid stream, the filtering device disposed between the process chamber gas outlet and the process chamber gas inlet along the streaming channel structure.

5. The apparatus according to claim 1 , wherein the first and second stream generating units have the same output power.

6. The apparatus according to claim 1 , further comprising a control unit assigned to the first and second stream generating units, wherein the control unit is configured to control operation of at least one of the first and second stream generating units dependent on the other of the first and second stream generating units.

7. The apparatus according to claim 1 , further comprising a control unit assigned to the first and second stream generating units, the control unit being configured to control operation of each the first and second stream generating units independently of each other.

8. The apparatus according to claim 7 , wherein the control unit is further configured to control operation of the first and second stream generating units in synchronized manner.

9. The apparatus according to claim 8 , wherein the control unit is configured to control operation of first and second stream generating units so as to generate a gaseous fluid stream of pre-defined streaming properties, whereby operation of each of the first and second stream generating units is controlled in such a manner that the first and second stream generating units co-act to generate the gaseous fluid stream of pre-defined streaming properties.

10. A stream generating device for an apparatus for additively manufacturing three-dimensional objects through successive layerwise selective irradiation and consolidation of layers of a powdered build material which can be consolidated by means of an energy beam in a process chamber, the stream generating device comprising:

a first stream generating unit comprising a first pumping device configured to generate a first gaseous fluid stream at least partly streaming through the process chamber; and

a second stream generating unit comprising a second pumping device configured to generate a second gaseous fluid stream at least partly streaming through the process chamber, wherein the second stream generating unit and the first stream generating unit are disposed in parallel, and wherein the first and second gaseous fluid streams are adapted to co-act to remove a non-consolidated particulate build material while streaming through the process chamber;

wherein the first and second stream generating units are disposed in a streaming channel structure extending off the process chamber and wherein the streaming channel structure comprises a branching section branching the streaming channel structure in at least two streaming channel branches, whereby the first stream generating unit is disposed in a first streaming channel branch and the second stream generating unit is disposed in a second streaming channel branch, and wherein a filtering device disposed in between the process chamber and the stream generating device.

11. The stream generating device according to claim 10 , further comprising a control unit assigned to the first and second stream generating units, wherein the control unit is configured to control operation of at least one of the first and second stream generating units dependent on the other of the first and second stream generating units.

12. The stream generating device according to claim 10 , further comprising a control unit assigned to the first and second stream generating units, wherein the control unit is configured to control operation of the first and second stream generating units independently of each other.

13. The stream generating device according to claim 12 , wherein the control unit is further configured to control operation of the first and second stream generating units in synchronized manner.