Exhaust device for a steam turbine module

Patent metadata

Field	Value
Publication number	US-9243516-B2
Application number	US-201213371603-A
Country	US
Kind code	B2
Filing date	Feb 13, 2012
Priority date	Feb 11, 2011
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A steam exhaust device for a steam turbine module includes a steam exhaust duct having a steam diffuser and a steam exhaust bottom wall, the steam exhaust duct being delimited by a surface of the steam diffuser configured to guide steam and by a steam exhaust bottom wall. A rigid hub includes one of a circular and a semicircular shape, the steam diffuser being rigidly fixed on the rigid hub. A rigid fastening device is fixed on the rigid hub and configured to support the steam exhaust device on a rigid frame.

First claim

What is claimed is:

1. A steam exhaust device for a steam turbine module comprising:
a steam exhaust duct including a steam diffuser having a radially outer flow guide surface; and
a steam exhaust bottom wall, the steam exhaust duct being delimited by the radially outer flow guide surface of the steam diffuser and by the steam exhaust bottom wall;
a rigid hub including one of a circular and a semicircular shape, the radially outer flow guide surface of the steam diffuser being rigidly fixed on the rigid hub and the rigid hub forming a portion of the radially outer flow guide surface of the diffuser; and
a rigid fastening device comprising a plurality of rods extending through the steam exhaust duct and fixed to the portion of the of the radially outer flow guide surface of the diffuser formed by the rigid hub and configured to support the steam exhaust device on a rigid frame,
wherein the rigid hub directly connects an internal body to the plurality of rods without the plurality of rods passing through the radially outer flow guide surface of the steam diffuser.

2. The steam exhaust device as recited in claim 1 , wherein a first end of each of the plurality of rigid rods is attached to the rigid hub.

3. The exhaust device as recited in claim 2 , wherein a second end of each of the plurality of rods is fixed to the steam exhaust bottom wall so as to be supported by the rigid frame.

4. The exhaust device as recited in claim 1 , wherein the radially outer flow guide surface of
the steam diffuser includes a revolution surface diverging around a revolution axis and a plurality of plate portions shaped and welded to one another and disposed on the rigid hub.

5. The exhaust device as recited in claim 4 , wherein each of the plurality of plate portions includes an annular-shaped section having an edge running on a constant radius of the revolution axis.

6. An internal structure for a steam turbine module comprising:
a steam exhaust device including a steam exhaust duct including a steam diffuser having a radially outer flow guide surface;
a steam exhaust bottom wall, the steam exhaust duct being delimited by the radially outer flow guide surface and by the steam exhaust bottom wall;
a rigid hub including one of a circular and a semicircular shape, the steam diffuser radially outer flow guide surface being rigidly fixed on the rigid hub and the rigid hub forming a portion of the radially outer flow guide surface of the diffuser;
a rigid fastening device comprising a plurality of rods extending through the steam exhaust duct and fixed on the rigid hub and configured to support the steam exhaust device on a rigid frame; and
an internal body configured to receive a turbine rotor and be supported on a side by the rigid hub,
wherein the rigid hub directly connects the internal body to the plurality of rods without the plurality of rods passing through the steam diffuser.

7. The internal structure as recited in claim 6 , wherein the radially outer flow guide surface of the steam diffuser includes a revolution surface diverging around a revolution axis and a plurality of plate portions shaped and welded to one another and disposed on the rigid hub.

8. The exhaust device as recited in claim 7 , wherein each of the plurality of plate portions includes an annular-shaped section having an edge running on a constant radius of the revolution axis.

9. A steam turbine module comprising: a rigid frame;
an internal body configured to receive a turbine rotor;
a steam exhaust device including a steam exhaust duct including:
a steam diffuser having a radially outer flow guide surface;
a steam exhaust bottom wall, the steam exhaust duct being delimited by the radially outer flow guide surface of the steam diffuser and by the steam exhaust bottom wall;
a rigid hub including one of a circular and a semicircular shape, the steam diffuser radially outer flow guide surface being rigidly fixed on the rigid hub and the rigid hub forming a portion of the radially outer flow guide surface of the diffuser;
a rigid fastening device comprising a plurality of rods extending through the steam exhaust duct and fixed on the rigid hub and configured to support the steam exhaust device on a rigid frame; and
a support device configured to support the internal body on the rigid frame,
wherein the rigid hub directly connects the internal body to the plurality of rods without the plurality of rods passing through the steam diffuser radially outer flow guide surface.

10. The steam turbine module as recited in claim 9 , wherein the support device is fixed on the steam exhaust bottom wall.

11. The steam turbine module as recited in claim 10 , wherein the support device includes a bearing configured to support a rotation of the turbine rotor.

12. The steam turbine module as recited in claim 9 , wherein the radially outer flow guide surface of the steam diffuser includes a form of a revolution surface diverging around a revolution axis and a plurality of plate portions shaped and welded to one another and disposed on the rigid hub.

13. The steam turbine module as recited in claim 12 , wherein each of the plurality of plate portions includes an annular-shaped section having an edge running on a constant radius of the revolution axis.

Assignees

• Roge Julien
• Laurent Xavier
• Alstom Technology Ltd

Inventors

• Roge Julien
• Laurent Xavier

Classifications

• F01D25/30 Primary

  Exhaust heads, chambers, or the like · CPC title

• F05D2220/31

  in steam turbines · CPC title

• F05D2230/50

  Building or constructing in particular ways · CPC title

• F01D25/16

  Arrangement of bearings; Supporting or mounting bearings in casings (bearings per se F16C) · CPC title

• F05D2260/30

  Retaining components in desired mutual position · CPC title