Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/002—Wall structures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
  • F23R2900/00012—Details of sealing devices

Definitions

• the invention relates to a heat shield assembly consisting of a support structure and a heat shield attached thereto with a voltage applied to the support structure, circumferential side wall wherein the side wall at least partially has a groove and an inner space facing the support structure and defined by groove and sidewall groove edges.
• the invention further relates to a combustion chamber having a heat shield assembly, and a gas turbine having such a combustion chamber.
• US Pat. No. 6,470,685 B2 discloses a heat shield arrangement having a first heat shield and a second heat shield adjacent thereto, leaving a gap.
• the individual heat shields are attached to a support structure, so that in each case an interior space is limited.
• On the hot wall side of a heat shield a plurality of projecting into the interior of the rods are mounted, which allow better cooling of the heat shield from the interior.
• the side walls of the heat shields are extended with an additional element, ie the side walls are located directly on the support structure on. In order to allow air to escape from the interior, cooling holes are introduced in the side walls.
• GB 2 298 266 A discloses a heat shield assembly with heat shields overlapping in the end regions. This thus forms a complete coverage of the wall to be protected from hot gas. At least one side wall of each heat shield lies with at least one contact point directly on the support structure. In order to allow air to escape, cooling holes are introduced both in the hot side of the heat shields and in the side walls.
• EP 1 507 116 A1 has a heat shield arrangement which comprises a plurality of heat shields arranged next to one another on a support structure while leaving a gap, wherein one or each heat shield is mounted on a support structure, so that an interior space is formed. Through an inlet channel coolant flows into the interior.
• the side walls are not directly on the support structure, but are connected via a respective seal with the support structure.
• the sealing element connects directly to the side wall, i. It represents a direct extension of this side wall dar. The thus extended side wall is located on the
• the sealing element thereby fulfill both a sealing function for the coolant and a mechanical damping function for the heat shield assembly.
• a sealing function for the coolant for the exit of the coolant from the interior of adeffenauslass- channel is provided, which opens into the gap.
• the known heat shields are based on the principle that the heat shield walls rest directly on the support structure during the assembly of the heat shields.
• For the cooling of the heat shields there are cooling openings which lead from the heat shield interior into the combustion chamber.
• the coolant is completely or partially passed through the cooling holes in this gap.
• the object of the invention is to provide an improved in terms of cooling efficiency heat shield assembly, which is characterized by an increase in efficiency.
• the heat shield assembly should be usable in a combustion chamber for gas turbines.
• a heat shield assembly consisting of a support structure and an attached heat shield with a voltage applied to the support structure, circumferential side wall wherein the side wall at least partially has a groove and an inner space facing the support structure and defined by groove and sidewall groove edges wherein the groove comprises a seal having at least two opposite edges, wherein the seal is clamped in the groove such that the at least two opposite edges are bent into the groove edges upon mounting of the heat shield on the support structure, such that rolling of the seal on the support structure is ensured, whereby a sealing function is ensured even during operation.
• the invention is based on the observation that at the high temperatures required for the combustion in the heat shields discussed above, thermally-induced occur so that the corners of the heat shields are pressed against the support structure.
• the hot-side center of the heat shields arches up.
• the individual sides of the heat shields resting on the support structure, which form the side wall, likewise bulge away from the support structure in such a way that the side center of the support structure is now spaced apart by a thermally-induced gap.
• a seal is mounted in the groove.
• the seal is strained so that the two edges point away from the support side.
• these edges are pressed into the Nutkanten, that is bent to the side wall of the heat shield.
• the sealing function is guaranteed, so to speak, by the clamping of the seal in the groove edges, since the groove edges hold the seal in its desired position. Due to the shape of the gasket clamped in this way, it is unrolled on the entire support structure.
• the thermally induced gap is optimally closed.
• the bias counteracts a thermal warping, as would be effected at a temperature gradient occurring with a non-preloaded seal.
• the heat shield bulges in the operating state. In this condition, essentially only the four heat shield ceilings remain in contact with the supporting structure. This has the effect that, in the critical operating state, the seal is, so to speak, held down in the groove edges, that is, remains in its previously desired position. This ensures the correct seat of the seal in all operating conditions, the function of the seal thus always ensured.
• the seal can fulfill its function optimally, as it always remains in the desired position.
• the coolant is essentially usually give as cooling air, which is wholly or partially removed from the compressor, which is arranged downstream of the combustion chamber.
• the seal is completely embedded in the groove.
• the seal is tightened particularly sure-fire-proof.
• the seal is an elastic bending strip. This one can be particularly well stretched and in the Groove be introduced and is easy to manufacture.
• the strip may also be tubular.
• the seal is made of metal or metal alloy. This is particularly heat and temperature resistant.
• the groove is arranged circumferentially over the entire side wall.
• the groove is arranged in regions over the entire side wall. This can be decided depending on the type of heat shield and production factors.
• the seal has a bending radius by the bracing.
• FIG 3 top view of a cut-open heat shield with groove
• FIG. 3 a schematic side view of a cut-open heat shield arrangement with a seal (planar)
• 3b shows a schematic side view of a cut-open heat shield arrangement with a seal (concave)
• 3c schematic side view of a cut-open heat shield arrangement with seal (convex) 4 shows a schematic drawing of the forces acting on the heat shield and the seal during operation
• a gas turbine has an upstream compressor for combustion air, an intermediate combustion chamber and a turbine for driving the compressor and a generator or a work machine, not shown.
• the combustion chamber comprises a support structure on which heat shield assemblies are attached.
• FIG 3 shows a plan view of a cut-open heat shield with a groove 7.
• the groove 7 is arranged in regions.
• the groove edges 16 are defined by the groove 7 and the side wall 4.
• the heat-shielded ceilings 22 remain on the support structure 2, while the centers of the side walls 4 bulge so that they can release a gap 13 through the coolant 14.
• FIG. 3a shows a schematic side view of a cutaway heat shield arrangement with a seal 6 (planar support structure).
• a groove 7 with the groove edges 16 is present.
• the seal has edges 8 (ends).
• the seal 6 with the edges 8 is introduced into the groove 16.
• the seal 6 is shaped such that the edges 8 of the seal 6 in the groove edges 16 is up. If now the heat shield 3 is mounted over the seal 6, the edges 8 are pressed into the groove edges 16, that is, bent to the side wall 4. Thus, the seal 6 is clamped in the groove 7. Due to the distortion, the seal 6 has a bending radius 20.
• the bending radius 20 of the seal 6 is smaller than the radius of the sealing surface in planar (FIG 3a) or convex (FIG 3b) to be sealed surfaces.
• the bending radius 20 of the seal 6 is greater than the radius of the sealing surface. Therefore, it is unrolled by the shape of the seal 6 on the support structure 2.
• the heat shield 3 bulges. In this state, essentially only at the heat ceiling 22, it has contact with the support structure 2.
• the thermally induced gap 14 is optimally closed.
• the bias causes the seal 6 to become in use, i. Do not warp when exposed to temperature, as would happen, for example, with a non-strained component. Since the heat shield 3 has contact with the support structure 2 on the heat cable covers 22 in every operating state, this ensures a correct seat in each of the operating states. Thus, the seal 6 thus always remains in its predetermined, desired position and can therefore optimally fulfill its sealing function.
• a seal 6 may for example consist of a thin bent metal strip or a thin bent metal tube.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Gasket Seals (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (2)

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ID=41066167

Family Applications (1)

Country Status (5)

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Citations (7)

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• 2008
  • 2008-06-12 DE DE200810028025 patent/DE102008028025B4/de not_active Expired - Fee Related
• 2009
  • 2009-06-05 CN CN2009801223061A patent/CN102066840A/zh active Pending
  • 2009-06-05 RU RU2011100155/06A patent/RU2508507C2/ru active
  • 2009-06-05 WO PCT/EP2009/056943 patent/WO2009150105A2/de active Application Filing
  • 2009-06-05 EP EP09761668.4A patent/EP2310748B1/de active Active

Patent Citations (7)

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