Flow deflector arrangement

Patent metadata

Field	Value
Publication number	US-9726030-B2
Application number	US-201414459820-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Aug 30, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A flow deflector arrangement is used in combination with a pipe arrangement secured through a component, the flow deflector arrangement comprising: a nut to secure the pipe arrangement to the component, and a shroud for attachment to the component so as to extend at least partially around the pipe arrangement when the pipe arrangement is secured to the component by the nut. The nut has an outwardly directed flange to adopt a position spaced from the component, and the shroud defines at least one deflector surface which, when the shroud is attached to the component, extends away from the component in spaced relation to the pipe arrangement. The flange and the deflector surface cooperate in deflecting a flow of fluid flowing from the component and along the outside of the pipe arrangement such that the flow is deflected generally outwardly from the pipe arrangement with a degree of swirl.

First claim

We claim:

1. A flow deflector arrangement for use in combination with a pipe arrangement secured with a component, the flow deflector arrangement comprising:
a nut configured to secure the pipe arrangement to the component, the nut including an outwardly directed flange, and
a shroud configured for attachment to the component so as to extend at least partially around the pipe arrangement when the pipe arrangement is secured to the component by the nut,
the shroud including a plurality of vanes arranged in spaced relation to one another around the shroud, the vanes each extending between a top plate and a mounting plate of the shroud, and the vanes each forming a deflector surface,

wherein, when the pipe arrangement is secured to the component by the nut:
the flange is configured to be spaced apart from the component,
the deflector surfaces each extend away from the component in spaced relation to the pipe arrangement, and
the flange and the deflector surfaces are configured to cooperate in deflecting a flow of fluid flowing from the component and along an outside of the pipe arrangement such that the flow is deflected generally outwardly from the pipe arrangement with a degree of swirl.

2. The flow deflector arrangement according to claim 1 , wherein the flange is formed integrally on the nut.

3. The flow deflector arrangement according to claim 1 , wherein the nut and the flange are provided as separate parts.

4. The flow deflector arrangement according to claim 1 , wherein the flange is circular, and the shroud is generally annular.

5. The flow deflector arrangement according to claim 1 , wherein the mounting plate defines an aperture that is configured to receive the pipe arrangement through the mounting plate.

6. The flow deflector arrangement according to claim 1 , wherein the shroud is configured such that when the shroud is attached to the component, the deflector surfaces each extend away from the component by a distance which is at least equal to a spacing between the flange and the component.

7. The flow deflector arrangement according to claim 1 , wherein:
the shroud is configured for attachment to the component prior to the pipe arrangement, and
the shroud is configured to permit, thereafter, access to the nut for securing the pipe arrangement to the component.

8. The flow deflector arrangement according to claim 1 , wherein the flange has a planar surface configured to lie in facing relation to a surface of the component when the pipe arrangement is secured to the component by the nut.

9. The flow deflector arrangement according to claim 1 , wherein the flange has a stepped surface configured to lie in facing relation to a surface of the component when the pipe arrangement is secured to the component by the nut.

10. The flow deflector arrangement according to claim 1 , wherein the shroud is annular such that the shroud extends around the pipe arrangement when the pipe arrangement is secured to the component by the nut.

11. The flow deflector arrangement according to claim 10 , wherein the vanes are each aerofoil-shaped.

12. The flow deflector arrangement according to claim 1 , wherein the shroud defines a single deflector surface which is configured to extend only partially around the pipe arrangement, in spaced relation to the pipe arrangement, when the shroud is attached to the component around the pipe arrangement.

13. The flow deflector arrangement according to claim 1 , wherein the nut forms part of the pipe arrangement.

14. The flow deflector arrangement according to claim 1 , wherein the component is a turbine case within a gas turbine engine and the pipe arrangement is a service pipe assembly secured through the turbine case.

15. A gas turbine engine having a turbine case and a service pipe assembly secured through the turbine case, the engine having a flow deflector arrangement according to claim 1 , wherein:
the shroud is attached to the outside of the turbine case, around the service pipe assembly,
the service pipe assembly is secured through the turbine case by the nut, and
the flow deflector arrangement is configured to deflect any leakage flow of gas flowing outwardly through the turbine case and along the outside of the service pipe assembly during operation of the engine such that the leakage flow becomes mixed with air outside the turbine case.

Assignees

• Rolls Royce Plc

Inventors

• Feaver Oliver George
• Mullender Andrew James

Classifications

• F02C7/24

  Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title

• F05D2260/31

  Retaining bolts or nuts · CPC title

• F15D1/0015

  Whirl chambers, e.g. vortex valves · CPC title

• F01D9/041

  using blades (F01D5/148 takes precedence) · CPC title

• F05D2220/32

  in gas turbines · CPC title