Securing a heat shield block to a support structure, and heat shield

Patent metadata

Field	Value
Publication number	US-10330318-B2
Application number	US-201414898138-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Jun 27, 2013
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

A heat shield with support structure and a number of heat shield blocks secured thereto, having a cold side facing the support structure and a hot side opposite the cold side. At least one recess is arranged in at least one heat shield block circumferential face, connecting the cold to hot side. An opening connecting the recess to the cold side runs in the circumferential face perpendicularly to the cold side. A securing bolt inserted into the opening secures the heat shield block to the support structure. A bolt head protrudes at least partly into the recess. The securing bolt passes through an angled plate having first limb extending substantially parallel to the circumferential face and second limb extending into the recess. The angled plate has a reinforcing device extending beyond the pure angular shape to increase a resistance of the angled plate against bending due to the securing bolt.

First claim

The invention claimed is:

1. A heat shield adapted for a gas turbine that comprises at least one combustion chamber, the heat shield comprising:
a support structure and a number of heat shield blocks,
wherein the number of heat shield blocks are secured to the support structure and each comprises a cold side exposed to cooling air and facing the support structure and a hot side exposed to hot gases and opposite the cold side, and, in at least one heat shield block of the number of heat shield blocks, at least one recess is arranged in at least one circumferential side of the at least one heat shield block, said at least one circumferential side connecting the cold side to the hot side,
an aperture, which connects the at least one recess to the cold side, extending in the at least one circumferential side perpendicularly to the cold side,
a securing bolt adapted to be inserted into the aperture to secure the at least one heat shield block to the support structure, such that a bolt head of the securing bolt projects at least partially into the at least one recess and simultaneously the securing bolt passes through an angled plate in a penetration region of the angled plate,
wherein the angled plate comprises a first limb, which extends substantially parallel to the at least one circumferential side, and a second limb, which extends into the at least one recess, wherein the first limb and the second limb adjoin each other at an angle edge, wherein the angled plate comprises a cold side of the angled plate that at least partly abuts the at least one heat shield block and a hot side of the angled plate opposite the cold side of the angled plate,
wherein the angled plate comprises a reinforcing device that increases a resistance of the angled plate to bending caused by the securing bolt, and
wherein the reinforcing device comprises a first side wall disposed on a side of the bolt head toward a mouth of the at least one recess and comprising: a first side wall cold end that runs along the angle edge on the hot side of the angled plate; and a first side wall hot end disposed between the first side wall cold end and the hot side of the at least one heat shield block, such that the first side wall extends across the mouth of the at least one recess, thereby at least partly closing the at least one recess and shielding the bolt head from hot gases present at the hot side during operation.

2. The heat shield as claimed in claim 1 ,
wherein at least one surface of the reinforcing device at least partially reflects cooling air emerging at a side of the bolt head.

3. The heat shield as claimed in claim 1 ,
wherein the first side wall closes the mouth of the at least one recess substantially completely.

4. The heat shield as claimed in claim 1 ,
wherein the first side wall is arranged substantially at right angles on a second side wall of the reinforcing device, wherein the second side wall rests atop and extends along the second limb and the second side wall comprises a bolt opening in alignment with the penetration region of the second limb.

5. The heat shield as claimed in claim 4 ,
wherein the securing bolt comprises at least one cooling air duct, which opens at a side of the bolt head in at least one outlet opening, wherein an aperture extending as far as a circumference of the bolt opening is arranged in the second side wall in a region of the at least one outlet opening of the at least one cooling air duct.

6. The heat shield as claimed in claim 1 ,
wherein the reinforcing device extends at least partially behind the penetration region, as seen from the angle edge, and reinforces the penetration region.

7. The heat shield as claimed in claim 6 ,
wherein the second limb of the angled plate or a second side wall of the reinforcing device comprises, on a side opposite the angle edge, a side wall which is angled in an opposite direction to the angle edge, extending at least partially behind the penetration region, as seen from the angle edge, and reinforces the penetration region.

8. The heat shield as claimed in claim 1 ,
wherein the reinforcing device is implemented at least partially by means of profiling of the second limb.

9. The heat shield as claimed in claim 8 ,
wherein the second limb comprises an undulating profile at least partially parallel to the angle edge.

10. The heat shield as claimed in claim 8 ,
wherein the second limb comprises an undulating profile at least partially perpendicularly to the angle edge.

11. The heat shield as claimed in claim 9 ,
wherein the undulating profile is sinusoidal, wherein the undulating profile traverses a sine function substantially from 0 to 2π.

12. The heat shield as claimed in claim 1 ,
wherein the at least one circumferential side comprises two opposite circumferential sides; and
wherein the at least one recess comprises two such recesses each arranged on a respective circumferential side of the two opposite circumferential sides of the at least one heat shield block, thus allowing the at least one heat shield block to be secured to the support structure by means of four securing bolts arranged in opposite pairs.

13. The heat shield as claimed in claim 1 ,
wherein the securing bolt is secured releasably to the support structure by means of a diaphragm spring assembly arranged on the support structure.

14. The heat shield as claimed in claim 1 , further comprising:
a hole in alignment with the securing bolt extending through the at least one heat shield block from the hot side to the at least one recess.

15. The heat shield as claimed in claim 1 ,
wherein the reinforcing device of the angled plate comprises, in the penetration region, a reinforcing body which is arranged between the first limb and the second limb, that projects into the aperture and is arranged by means of a lateral surface on the first limb and by means of an upper side on the second limb, wherein the reinforcing body comprises a through bore for the securing bolt, such that the securing bolt passes by means of a shank of the securing bolt through the penetration region and the reinforcing body.

16. The heat shield as claimed in claim 15 ,
wherein the reinforcing body comprises a substantially semicircular upper side parallel to the second limb, wherein a straight side of the semicircle rests on the first limb.

17. The heat shield as claimed in claim 15 ,
wherein the upper side of the reinforcing body resting on the second limb comprises substantially a shape of a triangle with a rounded apex, wherein the rounded apex is rounded substantially to match the through bore, and a base of the triangle adjoins the first limb.

18. The heat shield as claimed in claim 17 ,
wherein a height of the reinforcing body perpendicularly to the second limb is less at the rounded apex of a triangular upper side than at the base, such that the reinforcing body comprises substantially a shape of a prism with the triangular upper side as the base, wherein the prism is beveled opposite the triangular upper side.

19. The heat shield as claimed in claim 15 ,
wherein the angled plate is designed as an integral casting with the reinforcing device.

20. A combustion chamber, comprising:
the heat shield, designed as claimed in claim 1 .

21. A gas turbine, comprising:
at least one combustion chamber, designed as claimed in claim 20 .

Assignees

• Siemens Ag

Inventors

• Vogtmann Daniel
• Grendel Sabine
• Krusch Claus
• Kluge Andre
• Dümler Hartwig
• Grandt Christopher
• Bottcher Andreas
• Krieger Tobias
• Lapp Patrick

Classifications

• F23M5/04 Primary

  Supports for linings · CPC title

• F23R3/007

  constructed mainly of ceramic components · CPC title

• F23R3/002 Primary

  Wall structures (F23R3/02 and F23R3/007 take precedence) · CPC title