Combustion chamber of a gas turbine with bolted combustion chamber head

Abstract

A combustion chamber of a gas turbine having a head plate and a combustion chamber head, where the head plate is connected to the combustion chamber, and where several heat shields arranged in the interior of the combustion chamber are bolted to the head plate, characterized in that each heat shield and the combustion chamber head are fastened to the head plate by means of joint bolted connections.

Claims

1. A combustion chamber of a gas turbine comprising: a combustion chamber wall; a head plate connected to the combustion chamber wall, the head plate including a plurality of tubular fastening projections facing a combustion chamber head; the combustion chamber head including a plurality of fastening sleeves projecting into an interior of the combustion chamber head, the plurality of fastening sleeves aligning respectively with the plurality of tubular fastening projections, a plurality of heat shields arranged in an interior of the combustion chamber, a plurality of bolted connections fastening the plurality of heat shields to the head plate, a portion of the plurality of bolted connections each fastening both the combustion chamber head and one of the plurality of heat shields to the head plate, wherein each of the portion of the plurality of bolted connections includes a cylindrical shaft portion connected to the one of the plurality of heat shields and passing through a respective one of the plurality of tubular fastening projections into a respective one of the plurality of fastening sleeves and the each of the portion of the plurality of bolted connections causes the respective one of the plurality of tubular fastening projections to engage the respective one of the plurality of fastening sleeves.

2. The combustion chamber in accordance with claim 1, wherein the portion of the plurality of bolted connections each fastening both the combustion chamber head and the one of the plurality of heat shields to the head plate is fewer than the plurality of bolted connections fastening the plurality of heat shields to the head plate.

3. The combustion chamber in accordance with claim 2, wherein the combustion chamber head includes access recesses for access to the plurality of bolted connections.

4. The combustion chamber in accordance with claim 1, wherein the fastening sleeves include air passage openings.

5. The combustion chamber in accordance with claim 4, wherein the combustion chamber head is formed as a complete ring.

6. The combustion chamber in accordance with claim 4, wherein the combustion chamber head is formed by a plurality of separate segments.

7. The combustion chamber in accordance with claim 1, wherein the combustion chamber head is manufactured by additive production.

8. The combustion chamber in accordance with claim 1, wherein the combustion chamber head includes access recesses for access to the plurality of bolted connections.

9. The combustion chamber in accordance with claim 8, wherein the fastening sleeves project into the interior of the combustion chamber head, in an area of the access recesses.

10. The combustion chamber in accordance with claim 9, wherein the fastening sleeves include air passage openings.

11. The combustion chamber in accordance with claim 10, wherein the combustion chamber head is formed as a complete ring.

12. The combustion chamber in accordance with claim 10, wherein the combustion chamber head is formed by a plurality of separate segments.

13. The combustion chamber in accordance with claim 1, wherein the fastening sleeves include air passage openings.

14. The combustion chamber in accordance with claim 1, wherein the combustion chamber head is formed as a complete ring.

15. The combustion chamber in accordance with claim 1, wherein the combustion chamber head is formed by a plurality of separate segments.

Description

(1) The present invention is described in the following in light of the accompanying drawing showing an exemplary embodiment. In the drawing,

(2) FIG. 1 shows a gas-turbine engine for using the gas-turbine combustion chamber in accordance with the present invention,

(3) FIG. 2 shows a partial sectional view of an exemplary embodiment of a combustion chamber with the combustion chamber head being attached in accordance with the present invention,

(4) FIG. 3 shows a perspective partial view, by analogy with FIG. 2,

(5) FIG. 4 shows a perspective view of a segment component of a combustion chamber head in accordance with the present invention,

(6) FIG. 5 shows an enlarged representation in accordance with FIG. 4, and

(7) FIG. 6 shows an overall view of a combustion chamber head in accordance with the present invention.

(8) The gas-turbine engine 110 in accordance with FIG. 1 is a generally represented example of a turbomachine where the invention can be used. The engine 110 is of conventional design and includes in the flow direction, one behind the other, an air inlet 111, a fan 112 rotating inside a casing, an intermediate-pressure compressor 113, a high-pressure compressor 114, a combustion chamber 115, a high-pressure turbine 116, an intermediate-pressure turbine 117 and a low-pressure turbine 118 as well as an exhaust nozzle 119, all of which being arranged about an engine center axis 101.

(9) The intermediate-pressure compressor 113 and the high-pressure compressor 114 each include several stages, of which each has an arrangement extending in the circumferential direction of fixed and stationary guide vanes 120, generally referred to as stator vanes and projecting radially inwards from the engine casing 121 in an annular flow duct through the compressors 113, 114. The compressors furthermore have an arrangement of compressor rotor blades 122 which project radially outwards from a rotatable drum or disk 125 linked to hubs 126 of the high-pressure turbine 116 or the intermediate-pressure turbine 117, respectively.

(10) The turbine sections 116, 117, 118 have similar stages, including an arrangement of fixed stator vanes 123 projecting radially inwards from the casing 121 into the annular flow duct through the turbines 116, 117, 118, and a subsequent arrangement of turbine blades 124 projecting outwards from a rotatable hub 126. The compressor drum or compressor disk 125 and the blades 122 arranged thereon, as well as the turbine rotor hub 126 and the turbine rotor blades 124 arranged thereon rotate about the engine center axis 101 during operation.

(11) FIG. 2 shows in a simplified sectional view a combustion chamber outer wall 1 and a combustion chamber inner wall 2 which are connected to one another. A combustion chamber head 3 is connected to the combustion chamber outer wall 1, for example by means of a welding method. In the interior of the combustion chamber, a heat shield 4 is arranged which has four heat shield bolts 5 provided with an external thread for screwing on a nut 10.

(12) FIG. 2 furthermore shows a combustion chamber head 3 shown in greater detail in the following figures. The combustion chamber head 3 is designed such that it can be placed with its edge area 12 into a groove 13 of the head plate 6 in a precise fit and hence can be centered. On its inside, the combustion chamber head 3 has fastening sleeves 7 provided with air passage openings 11, as can be seen in particular from the illustration in FIG. 3. The fastening sleeves 7 are designed such that in the fitted state they contact fastening projections 14 of the head plate 6. A bolted connection can then be made by means of nuts 10.

(13) The combustion chamber head 3 is provided with access recesses 8 to permit bolting of the combustion chamber head 3 to the heat shield 4. The combustion chamber head furthermore has access recesses 9 by which access is afforded to the bolting points by means of which the heat shield 4 is bolted to the head plate 6.

(14) FIG. 3 shows a perspective representation of the view shown in FIG. 2. It can be seen here in particular that only some of the heat shield bolts 5 are used for fastening the combustion chamber head 3.

(15) FIGS. 4 to 6 show perspective partial views of the combustion chamber head looking onto the inside of the combustion chamber head 3. It can be seen here that a plurality of burner passage openings 15 is provided on the combustion chamber head 3. Each of these burner passage openings 15 is assigned a heat shield 4, which is bolted on by means of four heat shield bolts 5. While two of these fastening points are used for direct connection of the heat shield 4 to the head plate 6, fastening sleeves are provided at two of these fastening points on the combustion chamber head 3, by means of which sleeves the combustion chamber head 3 is fastened, as shown in FIGS. 2 and 3.

(16) FIGS. 4 and 5 show in particular the air passage openings 11 of the fastening sleeves 7 too.

(17) FIG. 6 shows an overall view of the combustion chamber head 3, which is made up of four segments.

LIST OF REFERENCE NUMERALS

(18) 101 Engine center axis 110 Gas-turbine engine/core engine 111 Air inlet 112 Fan 113 Intermediate-pressure compressor (compressor) 114 High-pressure compressor 115 Combustion chamber 116 High-pressure turbine 117 Intermediate-pressure turbine 118 Low-pressure turbine 119 Exhaust nozzle 120 Guide vanes 121 Engine casing 122 Compressor rotor blades 123 Stator vanes 124 Turbine blades 125 Compressor drum or disk 126 Turbine rotor hub 127 Exhaust cone 1 Combustion chamber outer wall 2 Combustion chamber inner wall 3 Combustion chamber head 4 Heat shield 5 Heat shield bolt 6 Head plate 7 Fastening sleeve on combustion chamber head 8 Access recess 9 Access recess 10 Nut 11 Air passage opening 12 Edge area 13 Groove 14 Fastening projection 15 Burner passage opening