Sealing configuration, in particular for a rotary machine

• US 6,578,849 B2
• Filed: 01/16/2001
• Issued: 06/17/2003
• Est. Priority Date: 07/15/1998
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Haje, Detlef
• Primary Examiner(s): Sandy, Robert J.
• Assistant Examiner(s): PEAVEY, ENOCH E
• Application Number:
  US09/761,595
• Publication Number:
  US 20010006278A1
• Time in Patent Office: 882 Days
• Field of Search: 277/402, 277/412, 277/549, 277/561, 277/575, 277/387, 277/389, 277/391, 277/393, 277/413
• US Class Current: 277/389
• CPC Class Codes: F16J 15/164 the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
• CPC Class Codes: F16J 15/363 the diaphragm or bellow being made of metal
• CPC Class Codes: F16J 15/445 with means for adjusting the clearance

Abstract

A sealing configuration is provided for sealing off a first region from a second region through which a fluid can flow and which can be kept at different pressures. The sealing configuration has a deformation region and a sealing surface connected thereto. The sealing surface is spaced apart from an opposing surface by a sealing gap. The width of the sealing gap depends on a deformation of the deformation region as a result of a differential pressure. The sealing configuration preferably serves to seal off a turbine shaft from a turbine casing or a moving blade from a turbine casing.

Claims

1. A sealing configuration, comprising:

first and second regions for at least one of conducting a fluid flow and being filled with a fluid, said regions to be sealed-off relative to one another and kept at different pressures forming a differential pressure;

an opposing surface;

a deformation region;

a sealing surface connected to said deformation region and spaced apart from said opposing surface by a sealing gap, said sealing gap having a height to be set by a deformation of said deformation region as a result of a force exerted by said differential pressure; and

at least one gap-influencing element disposed on at least one of said sealing surface and said opposing surface.

2. The sealing configuration according to claim 1, including at least one sealing element disposed on at least one of said sealing surface and said opposing surface and projecting into one of said sealing gap and said sealing surface.

3. The sealing configuration according to claim 2, wherein one of said regions has a low pressure, said sealing surface has a marginal region toward said low pressure, and said at least one sealing element is disposed at said marginal region.

4. The sealing configuration according to claim 2, wherein said at least one sealing element includes two sealing elements disposed at a distance from one another in a main gap direction corresponding to a differential-pressure-induced flow direction.

5. The sealing configuration according to claim 4, wherein one of said sealing elements reduces said gap height to a first height, and another of said sealing elements reduces said gap height to a second height differing from said first height.

6. The sealing configuration according to claim 1, wherein said at least one gap-influencing element is selected from the group consisting of a swirl breaker and a hydrodynamic bearing surface.

7. The sealing configuration according to claim 1, wherein at least one of said deformation region and said sealing surface is ring-shaped.

8. The sealing configuration according to claim 1, wherein said deformation region is bellows-shaped.

9. The sealing configuration according to claim 1, including a machine axis, said sealing gap extending in a sealing plane inclined relative to said machine axis by 70°

to 110°

, for sealing another gap extending along said machine axis.

10. The sealing configuration according to claim 1, wherein at least one of said deformation region and said sealing surface is formed of a material selected from the group consisting of a high-temperature-resistant steel,. a nickel-base alloy and a cobalt-base alloy.

11. The sealing configuration according to claim 1, wherein said sealing surface has a geometric configuration causing a deformation of said sealing surface to occur, as a result of a pressure difference at said sealing surface, for reducing said height of said sealing gap.

12. The sealing configuration according to claim 1, including a stationary machine component and a machine component rotatable about a machine axis, one of said sealing surface and said opposing surface disposed on said stationary machine component and the other of said sealing surface and said opposing surface disposed on said machine component rotatable about a machine axis.

13. The sealing configuration according to claim 12, wherein said stationary machine component and said machine component rotatable about a machine axis are parts of a rotary machine.

14. The sealing configuration according to claim 13, wherein said rotary machine is selected from the group consisting of a turbine, a compressor and a generator.

15. The sealing configuration according to claim 12, wherein said stationary machine component and said machine component rotatable about a machine axis are parts of a fluid-flow machine having a moving blade, and said opposing surface is disposed on said moving blade.

16. The sealing configuration according to claim 15, wherein said fluid-flow machine is a steam turbine.

17. The sealing configuration according to claim 12, wherein said stationary machine component and said machine component rotatable about a machine axis are parts of a fluid-flow machine having a guide blade, and said sealing surface is disposed on said guide blade.

18. The sealing configuration according to claim 17, wherein said fluid-flow machine is a steam turbine.