Method for manufacturing a burner assembly, and burner assembly
Patent Information
- Application Number
- EP2023786032
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2022-10-25
- Filing Date
- 2023-10-05
- Publication Date
- 2025-09-03
- Estimated Expiration
- 2043-10-05
AI Technical Summary
The existing methods for manufacturing burner assemblies are inefficient and costly due to the use of multiple different fastening techniques, requiring specialized skills and increased production effort and time, as well as the need for transporting parts between different machines.
A method where all components of the burner assembly are connected using laser welding from the outside in a single manufacturing process, simplifying production by using a single technique and reducing the need for multiple machines, with the burner tube and body being pressed and welded together, and optional inclusion of a fleece and diaphragm for enhanced connection.
This approach simplifies production, reduces cycle times and costs by standardizing the welding process, allowing all components to be connected in one machine pass with reduced labor and equipment requirements.
Smart Images
Figure 1.1
Abstract
Description
[0001] Method for manufacturing a burner assembly and burner assembly
[0002] The present invention relates to a method for manufacturing a burner assembly. Furthermore, the invention relates to a burner assembly manufactured using the method.
[0003] A multi-part burner assembly, for example, is described in DE 10 2010 042 184 A1. In the prior art, the individual parts are typically connected using different methods. For example, the fleece is attached by spot welding. The fuel supply is brazed. Different processes can be used to attach the burner tube to the burner body, such as tungsten inert gas welding or laser welding. These different attachment methods increase the complexity and cost of manufacturing.
[0004] According to DE 102013220653 B4, components of a burner assembly – designed as deep-drawn sheet metal parts – can be joined externally by laser welding by partially overlapping axially. In particular, a ring-like component surrounds a component forming the floor of the combustion chamber at a portion facing away from the combustion chamber. An evaporator medium rests on this floor and is clamped between other components.
[0005] DE 10 2009 044 883 B4, for example, discloses that special components such as a unit serving as a fuel supply are welded.
[0006] The object underlying the invention is to propose a manufacturing method which allows the production of a burner assembly using one manufacturing method and thus preferably also in one pass with one machine.
[0007] The invention solves this problem by a method for manufacturing a burner assembly, the method comprising at least the following steps: pressing a burner tube onto a burner body, and connecting the burner tube to the burner body from the outside by laser welding. According to the invention, laser welding serves to connect the burner tube and the burner body. The burner body, for example, has a more complex structure and is therefore preferably a cast workpiece, e.g. made of investment casting. The burner body can therefore also be referred to as a burner casting. The burner tube is first fixed by pressing and then securely connected to the burner body by laser welding. This only occurs from the outside. If, for example, the burner tube encompasses the section of the burner body which has the burning surface, the welding is carried out via the outer surface of the burner tube.Alternatively, if the burner tube is pressed into a section of the burner body, the welding is then carried out over the outer surface of the burner body.
[0008] Laser welding is preferably carried out only at specific points.
[0009] One embodiment of the method consists in that, before the burner tube is pressed onto the burner body, a fleece is inserted into the burner body, a force is applied to the fleece so that the fleece adheres to a wall of the burner body, and the fleece is connected to the burner body from the outside via laser welding. In this embodiment, the fleece is also attached from the outside via laser welding. First, the fleece is inserted into the burner body. Then, a force is exerted on the fleece, e.g., via a stamp, so that it adheres to the burner body, in particular to the inside of a wall. Laser welding then takes place from the outside, e.g., via the outside of the section of the burner body in which the fleece is located. In one embodiment, the fleece is made from a cut and rounded strip of metal mesh.
[0010] One embodiment of the method involves pressing a baffle into the burner tube before connecting the burner tube to the burner body, and then connecting the baffle to the burner tube from the outside via laser welding. In this embodiment, a baffle is inserted into the burner tube. This is done initially by pressing as a temporary fixation and then by laser welding from the outside, i.e., via the outer surface of the burner tube. The baffle is, in particular, a deep-drawn part.
[0011] One embodiment of the process involves connecting a fuel supply to the burner body via laser welding. In this embodiment, the fuel supply, which could be a fuel line, for example, is also attached via laser welding. If all individual parts are connected to one another via laser welding, only one technique is used, and thus only the specific skills and knowledge required for this process are required.
[0012] In one embodiment, all welding processes take place in a single machine. This design simplifies production, reduces cycle times, and lowers manufacturing costs. In particular, it eliminates the need to transport individual parts or subassemblies between different machines.
[0013] Furthermore, the invention achieves the object by means of a burner assembly manufactured using the method according to one of the embodiments described above or below. The explanations regarding the method also apply accordingly to the assembly. Therefore, repetition is omitted.
[0014] According to one embodiment, the burner body is a cast component. The burner body is, for example, an investment casting.
[0015] In detail, there are numerous possibilities for designing and developing the method and burner assembly according to the invention. Reference is made to the following description of exemplary embodiments in conjunction with the drawings. They show:
[0016] Fig. 1 : a section through a burner assembly and
[0017] Fig. 2: a spatial representation of an enlarged detail of the burner assembly.
[0018] Fig. 1 shows a burner assembly in which all components have been joined together by laser welding.
[0019] The burner body 1 is preferably a cast component which, among other things, has the structures for supplying the fuel and combustion air, for mixing them, and the actual combustion surface. The fleece 3 is a strip-shaped metal mesh which is pressed into a walled area of the burner body 1 and then laser-welded from outside the edge area of the burner body 1. The fuel supply 5, which is designed in the form of a line here, is also connected to the burner body 1 by laser welding. In one embodiment, these two steps take place in a first workpiece carrier in which the burner body 1 is held. In a further step, the aperture 4 is pressed into the cylindrical burner tube 2 and fastened by laser welding from the outside, i.e. from outside the burner tube 2. The intermediate assembly comprising the burner body 1, fleece 3, and fuel supply 5 is then held in a second workpiece carrier.The burner tube 2 is pressed onto a wall of the burner body 1, which encloses the burner surface, and is then connected to the burner body 1 from the outside of its outer surface via laser welding. In an alternative, preferred embodiment, the orifice plate 4 is pressed into the burner tube 2 in one step. In a next step, the burner tube 2, including the orifice plate 4, is pressed onto the burner body 1 (also referred to as: casting from casting). Welding is then performed for both parts (i.e., orifice plate to tube and tube to casting) in one machine in the same pass.
[0020] Fig. 2 shows how the fleece 3 rests against the inside of the wall 10 of the torch body 1 and has been fixed there by welding from the outside. For this purpose, the fleece 3 is first inserted and then pressed against the wall 10 using a stamp to ensure it fits snugly. Preferably, when the stamp - not shown here - presses the fleece 3 against the inside wall, the fleece is also squeezed at the same time so that the laser beam finds a denser structure for a good connection. The fleece 3 is then welded to the inside of the wall 10 from the outside. The welding process thus takes place through the wall 10 of the torch body 1, which is designed as a cast part.
Claims
Patent claims 1. A method for manufacturing a burner assembly, the method comprising at least the following steps: that a burner tube (2) is pressed onto a burner body (1), and that the burner tube (2) is connected to the burner body (1) from the outside by laser welding.
2. Method according to claim 1, wherein before pressing the burner tube (2) to the burner body (1) a fleece (3) is introduced into the burner body (1), wherein a force is applied to the fleece (3) so that the fleece (3) is applied to a wall (10) of the burner body (1), and wherein the fleece (3) is connected to the burner body (1) from the outside via laser welding.
3. Method according to claim 1 or 2, wherein before connecting the burner tube (2) to the burner body (1) a diaphragm (4) is pressed into the burner tube (2), and wherein the diaphragm (4) is connected to the burner tube (2) from the outside by laser welding.
4. Method according to one of claims 1 to 3, wherein a fuel supply (5) is connected to the burner body (1) by laser welding.
5. Burner assembly manufactured by a method according to any one of claims 1 to 4.
6. Burner assembly according to claim 5, wherein the burner body (1) is a cast component.