Thermally driven spring valve for turbine gas path parts

Patent metadata

Field	Value
Publication number	US-10113441-B2
Application number	US-201614990528-A
Country	US
Kind code	B2
Filing date	Jan 7, 2016
Priority date	Jan 7, 2016
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A thermally driven spring valve for turbine gas path parts is disclosed herein. A thermally driven spring valve includes a bimetallic sheet comprising a base, a first finger portion extending from the base and a second finger portion extending from the base, the first finger portion having a first curvature vector and the second finger portion have a second curvature vector, wherein an exterior surface extends from the base through the first finger portion and the second finger portion and an interior surface extends from the base through the first finger portion and the second finger portion, wherein the exterior surface of the first finger portion is disposed proximate the interior surface of the base wherein the exterior surface of the second finger portion is disposed proximate the interior surface of the base. A thermally driven spring valve may include perforations through a finger portion.

First claim

What is claimed is:

1. A thermally driven spring valve comprising:
a metallic sheet comprising a base, the sheet having cutouts forming a first finger portion extending from the base and a second finger portion extending from the base, the first finger portion having a first curvature vector and the second finger portion having a second curvature vector,
wherein the first finger portion, the second finger portion, and the base are monolithic,
wherein an exterior surface extends from the base through the first finger portion and the second finger portion and an interior surface extends from the base through the first finger portion and the second finger portion,
wherein the exterior surface of the first finger portion is disposed proximate the interior surface extending from the base,
wherein the exterior surface of the second finger portion is disposed proximate the interior surface extending from the base.

2. The thermally driven spring valve of claim 1 , wherein at least one of the first finger portion or the second finger portion comprises a perforation.

3. The thermally driven spring valve of claim 1 , wherein the metallic sheet is bimetallic and wherein the metallic sheet comprises at least one of cobalt, cobalt alloy, platinum, or platinum alloy.

4. The thermally driven spring valve of claim 1 , wherein the first curvature vector is variable in accordance with temperature.

5. The thermally driven spring valve of claim 1 , wherein the metallic sheet has a coefficient of thermal expansion of between about 0.6×10 −6 /K and about 15×10 −6 /K.

6. A stator vane for a gas turbine engine comprising:
a platform;
an airfoil extending from the platform, the airfoil having a core configured to transmit coolant and extending from the platform into the airfoil, the core having an axial inner wall and an outer sidewall defining a portion of the airfoil and having a sidewall perforation therethrough configured to allow a flow of coolant from the core through the airfoil;
a thermally driven spring valve disposed within the core and comprising a metallic sheet comprising a base, a first finger portion extending from the base, and a second finger portion extending from the base, the first finger portion having a first curvature vector and the second finger portion having a second curvature vector,
wherein an exterior surface extends from the base through the first finger portion and the second finger portion and an interior surface extends from the base through the first finger portion and the second finger portion,
wherein the exterior surface of the first finger portion is disposed proximate the interior surface extending from the base,
wherein the exterior surface of the second finger portion is disposed proximate the interior surface extending from the base;
the thermally driven spring valve disposed within the core, coupled to a core wall at the base, wherein the first finger portion and the second finger portion of the thermally driven spring valve are configured to restrict the flow of coolant through the sidewall perforation.

7. The stator vane for a gas turbine engine of claim 6 , wherein at least one of the first finger portion or the second finger portion of the thermally driven spring valve comprises a perforation.

8. The stator vane for a gas turbine engine of claim 6 , wherein the base of the thermally driven spring valve is coupled to the core by at least one of brazing or welding.

9. The stator vane for a gas turbine engine of claim 6 , wherein the coolant is bleed air.

10. The stator vane for a gas turbine engine of claim 6 , wherein the metallic sheet is bimetallic and comprises at least one of cobalt, cobalt alloy, platinum, or platinum alloy.

11. The stator vane for a gas turbine engine of claim 6 , wherein the first finger portion has a first coefficient of thermal expansion and the second finger portion has a second coefficient of thermal expansion, the first coefficient of thermal expansion being different from the second coefficient of thermal expansion.

12. The stator vane for a gas turbine engine of claim 6 wherein, the metallic sheet has a coefficient of thermal expansion of between 0.6×10 −6 /K and about 15×10 −6 /K.

13. The stator vane for a gas turbine engine of claim 6 , wherein the first curvature vector is variable in accordance with temperature.

14. The stator vane for a gas turbine engine of claim 13 , wherein a gas path airflow against the stator vane has a temperature of between 1000° F. to 2000° F.

Assignees

• United Technologies Corp

Inventors

• Propheter-Hinckley Tracy A
• Thornton Lane M

Classifications

• F05D2300/50212

  dissimilar · CPC title

• F05D2300/17

  Alloys · CPC title

• F01D17/12 Primary

  arranged in stator parts · CPC title

• F05D2300/143

  Platinum group metals, i.e. Os, Ir, Pt, Ru, Rh, Pd · CPC title

• F05D2220/32

  in gas turbines · CPC title