Blade of a turbo machine

Patent metadata

Field	Value
Publication number	US-11486258-B2
Application number	US-202017029411-A
Country	US
Kind code	B2
Filing date	Sep 23, 2020
Priority date	Sep 25, 2019
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

Abstract

A blade of a turbo machine, having a blade leaf, with a flow leading edge, a flow trailing edge, and flow conducting surfaces, and a cooling passage integrated in the blade leaf. In the region of the blade leaf cooling passage portions extend substantially in the radial direction. Adjacent cooling passage portions merge into one another via a diversion passage portion having a material web extending between the adjacent cooling passage portions. The respective material web ends in the region of the respective diversion passage portion. The respective material web has a defined axial width between the respective adjacent cooling passage portions and the respective material web in the region of the respective diversion passage portion has a material thickening enlarging the axial width by at least 20%.

First claim

The invention claimed is:

1. A blade of a turbo machine, comprising:
a blade root configured to fasten to a hub body of the turbo machine;
a blade leaf, wherein the blade root is separated from the blade leaf by an inner shroud, wherein the blade leaf comprises:
a flow leading edge;
a flow trailing edge; and
flow conduction surfaces for a process medium extending between the flow leading edge and the flow trailing edge;
one continuous cooling passage integrated in the blade leaf and the blade root for a cooling medium, comprising:
an inlet at a first fluidic end of the one continuous cooling passage is formed radially inside on the blade root;
an outlet at a second fluidic end of the one continuous cooling passage radially outside on the blade leaf or on an outer shroud;
wherein in a region of the blade leaf radial cooling passage portions each extend substantially in a radial direction a length of the blade leaf, wherein adjacent radial cooling passage portions merge into one another via a respective diversion passage portion;
a material web extending between the adjacent radial cooling passage portions in the blade leaf, wherein the respective material web ends in a region of the respective diversion passage portion,
wherein the respective material web between the respect the adjacent radial cooling passage portions has as defined axial width,
wherein the respective material web in the region of the respective diversion passage portion has a material thickening enlarging an axial width by at least 20%.

2. The blade according to claim 1 , wherein the respective material web in the region of the respective diversion passage portion has an enlargement of the axial width by between 20% and 40%.

3. The blade according to claim 2 , wherein the respective material web in the region of the respective diversion passage portion has an enlargement of the axial width by between 30% and 40%.

4. The blade according to claim 1 , wherein seen in an axial section the respective material thickening is formed prism-like with an axially front rounded corner that is thus facing the flow leading edge, with an axially back rounded corner thus facing away from the flow leading edge, and an axially central, radially outer or radially inner rounded corner arranged seen in an axial direction between these rounded corners.

5. The blade according to claim 4 , wherein seen in the axial section the respective prism-like material thickening is formed symmetrically such that a respective axially front corner and a respective axially back corner are arranged in a same radial position, and in that a respective axially central corner is arranged in an axial centre between the respective axially front corner and the respective axially back corner and in an axial centre of the respective material web outside the material thickening.

6. The blade according to claim 4 , wherein in the axial section, the respective prism-like material thickening is formed unsymmetrically such that the respective axially central corner is moved, relative to an axial centre between the respective axially front corner and the respective axially back corner and relative to the axial centre of the respective material web outside the material thickening, axially to the front and thus in a direction of the flow leading edge.

7. The blade according to claim 6 , wherein an amount by which the respective axially central corner is shifted axially to the front to between 10% and 20% of the axial width of the respective web outside the material thickening.

8. The blade according to claim 6 , wherein in the axial section the respective prism-like material thickening is formed unsymmetrically such that the respective axially front corner is radially offset relative to the respective axially back corner in the radial direction.

9. The blade according to claim 8 , wherein in the region of a radially outer diversion passage portion the respective axially front corner is moved radially to the inside relative to the respective axially back corner.

10. The blade according to claim 8 , wherein in the region of a radially inner diversion passage portion the respective axially front corner is offset relative to the respective axially back corner radially to the outside.

11. The blade according to claim 8 , wherein a radial offset between the axially front corner relative to the axially back corner is between 10% and 20% of a radial height of the respective material thickening.

12. The blade according to claim 1 , further comprising:
wherein in the region of the blade leaf a first cooling passage portion of the cooling passage initially extends to radially outside in the direction of a radially outer diversion passage portion, following this a second cooling passage portion to radially inside in the direction of a radially inner diversion passage portion and following this a third cooling passage portion to radially outside in the direction of the outlet of the cooling passage,
a first material web extends between the first cooling passage portion and the second cooling passage portion and between the second cooling passage portion and the third cooling passage portion a second material web extends, wherein first material web ends in the region of the radially outer diversion passage portion and the second material web in the region of the radially inner diversion passage portion,
wherein the first material web and the second material web has a defined axial width between the respective cooling passage portions, and
wherein the first material web and/or the second material web, in the region of the respective diversion passage portion, has the material thickening enlarging the axial width by at least 20%.

13. The blade according to claim 1 , wherein the blade leaf extends radially outward beyond an inner shroud.

14. The blade according to claim 13 , wherein the blade rood extends radially inward from the inner shroud.

15. The blade according to claim 12 , wherein at least one diversion passage is radially inside the inner shroud and the respective material web defining this diversion passage does not extend into the blade root.

16. The blade according to claim 1 , wherein the inlet at the first fluidic end of the one continuous cooling passage comprises:
a first inlet passage portion arranged in the blade root;
a second inlet passage portion in the blade root that is axially offset from the first inlet portion; and
a connecting passage portion in which the first inlet passage portion joins the second inlet passage portion.

Assignees

• Man Energy Solutions Se

Inventors

• Pöhler Thorsten
• Frank Dirk

Classifications

• F05D2250/90

  Variable geometry · CPC title

• F05D2240/303

  related to the leading edge of a rotor blade · CPC title

• F01D9/023

  Transition ducts between combustor cans and first stage of the turbine in gas-turbine engines; their cooling or sealings · CPC title

• F05D2250/185

  serpentine-like · CPC title

• F05D2250/00

  Geometry · CPC title