MULTI-FLAME BURNER AND METHOD FOR HEATING A WORKPIECE

Abstract

A multi-flame burner is disclosed with burner heads, which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, wherein the flame axes of respectively adjacent burner heads are inclined relative to each other. A method for preheating a workpiece, in particular a pipe or large-diameter pipe, using a multi-flame burner is also disclosed.

Claims

1. A multi-flame burner with a plurality of burner heads and accompanying connection pipes, which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, characterized in that at least half of the connection pipe is offset in design, so that the flame axes of respectively adjacent burner heads are inclined divergent relative to each other.

2. The multi-flame burner according to claim 1, characterized in that all connection pipes are offset in design.

3. The multi-flame burner according to claim 1, characterized in that the offset connection pipes exhibit an offset angle of 30 to 60

4. The multi-flame burner according to claim 3, characterized in that the offset connection pipes exhibit an offset angle of approximately 45.

5. The multi-flame burner according to claim 1, characterized in that the connection pipes are pivoted with a respective connection nozzle by way of a screw joint, wherein the respective other end of the connection nozzles is secured to a shared feed line, and can be supplied with the fuel through the shared feed line.

6. The multi-flame burner according to claim 1, characterized in that the burner heads are provided in at least two groups (A, B) of burner heads, wherein the burner heads of at least a first group (A) are each arranged alternately to the burner heads of at least one other group (B), and the flame axes of the burner heads of at least the first group (A) are inclined relative to the flame axes of the burner heads of at least the one other group (B).

7. The multi-flame burner according to claim 5, in which the burner heads within each group (A, B) are each arranged in the same direction or in a direction parallel to each other.

8. The multi-flame burner according to claim 5, in which the burner heads each exhibit flame axes, which are axially and/or radially inclined in relation to a perpendicular on a center line of the shared feed line.

9. The multi-flame burner according to claim 8, wherein respectively adjacent ones of the plurality of burner heads are inclined to each other by an angle of from 5 to 45 relative to each other.

10. The multi-flame burner according to claim 1, characterized in that a gas supply device supplies the multi-flame burner with at least one gaseous fuel selected from the group consisting of an acetylene-containing fuel mixture, an acetylene-(compressed) air-mixture and an acetylene-oxygen mixture.

11. The multi-flame burner according to claim 1, characterized in that a feed line configured as a bent shaft is connected to each one of the connection pipes.

12. The multi-flame burner according to claim 11, characterized in that the bent shaft is constructed from a material comprising stainless steel.

13. The multi-flame burner according to claim 1, characterized in that the burner heads are alternatively interleaved relative to each other and the burner flames point away from each other.

14. The multi-flame burner according to claim 1 characterized in that the burner heads are spaced apart 5 to 15 centimeters from each other.

15. The multi-flame burner according to claim 5, characterized in that the burner heads are radially alternately inclined clockwise and counterclockwise in relation to the axis of the shared feed line.

16. A method for preheating a workpiece by a multi-flame burner which comprises a plurality of burner heads and accompanying connection pipes, which are set up to generate at least one burner flame directed along a respective flame axis when supplied with a fuel, characterized in that at least half of the connection pipe is offset in design, so that the flame axes of respectively adjacent burner heads are inclined divergent relative to each other, and the at least one burner flames generated by the multi-flame burner is directed at the workpiece.

17. The method according to claim 16, characterized in that the workpiece is selected from the group consisting of a pipe and a large-diameter pipe,

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The invention will be explained in greater detail with reference to the attached drawings, which show a preferred embodiment of the invention,

[0042] FIG. 1 shows a burner head, which can be used for a multi-flame burner according to an embodiment of the invention.

[0043] FIG. 2 shows a schematic, side view of a mufti-flame burner according to an embodiment of the invention.

[0044] FIG. 3 shows a schematic, longitudinal view of a multi-flame burner according to an embodiment of the invention.

[0045] Elements corresponding to one another on the figures bear identical reference numbers. Repeated explanations will be avoided for the sake of clarity.

DETAILED DESCRIPTION OF THE INVENTION

[0046] FIG. 1 shows a schematic view of a burner head 1 exhibiting a nozzle ring 12 that can have any desired number of preferably concentrically arranged nozzles, through which fuel can escape. Igniting the fuel produces a burner flame 13, which runs along a flame axis 14. The burner head 1 can be attached to a feed line by way of an offset connection pipe 4 along with a screw joint 15 and connection nozzle 16. For example, the connection nozzle 16 is welded to the feed line.

[0047] FIG. 2 shows a schematic, side view of a multi-flame burner according to an especially preferred embodiment of the invention, which is marked 10 overall. The multi-flame burner 10 encompasses a total of eight burner heads 1, each with respectively accompanying, offset connection pipes 4, not all of which are provided with reference numbers. The burner heads 1 are here combined into groups of burner heads A and B. A first group of burner heads A is here arranged in such a way that the respective nozzle units or the nozzles provided there can yield burner flames with flame axes essentially arranged in the same direction. The same holds true for the burner heads in group B. However, the flame axes 14 in group A and the flame axes 14 in group B are inclined or skewed relative to each other given the inclined position of the burner heads 1, so that respectively produced exhaust gases and/or the generated waste heat can damage non-adjacent burner heads 1.

[0048] The screw joints 15 described above and the connection nozzles 16 are used to secure the burner heads 1 to a feed line 2, for example one that is bent, and hence can be adjusted to the shape of a workpiece to be machined. The feed line can be coupled with a supply line 3, which can exhibit other devices, such as a manometer and regulator. In particular, such a supply line can exhibit a mixing unit 31, with which an acetylene/oxygen mixture and/or an acetylene/air mixture can be generated.

[0049] In another, simplified configuration of the invention, it can also be advantageous for specific, less demanding applications to do without the screw joint 15, and hence the ability of the offset connection pipe to rotate. In this case, the connection nozzle 16 can be lengthened and offset in design, thereby combining the connection nozzle 16 and connection pipe 4 into a single component.

[0050] FIG. 3 shows a longitudinal view of a multi-flame burner according to an especially preferred embodiment of the invention, which is also marked 10. As evident, the respective burner heads 1 are slanted relative to each other, so that the arising flames 13 point away from each other. The feed line 2 can be bent or straight in design.

REFERENCE LIST

[0051] 1 Burner head [0052] A, B Group [0053] 10 Multi-flame burner [0054] 12 Nozzle ring [0055] 13 Burner flame [0056] 14 Flame axis [0057] 15 Screw joint [0058] 16 Connection nozzle [0059] 2 Connection line, shaft [0060] 3 Supply line [0061] 4 Offset connection pipe [0062] 31 Mixing unit