CN102587996A

CN102587996A - Steam turbine rotor with mechanically coupled high and low temperature sections using different materials

Info

Publication number: CN102587996A
Application number: CN2012100141301A
Authority: CN
Inventors: D·帕拉沙; S·库马
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 2011-01-06
Filing date: 2012-01-06
Publication date: 2012-07-18
Also published as: JP2012145104A; US20120177494A1; EP2479377A2; RU2011154008A

Abstract

The Inverter relates to a steam turbine rotor with mechanically coupled high and low temperature sections using different materials. The turbine rotor including an elongated shaft having at least an HP region 12, the HP region having a first section supporting a stage 1 rotor wheel 14 and a second section supporting a stage 2 rotor wheel 16, the first section formed of a relatively higher-temperature-capability material and the second section formed of a relatively lower-temperature-capability material. Various mechanical couplings 26, 28, 30, 32 are described for securing the first and second sections.

Description

The steam turbine rotor of high and low temperature section with different materials of mechanical coupling

Technical field

The present invention relates to be used for the rotor of turbo machine, and relate more specifically to the formation of rotor in the axial section of different materials.

Background technique

In recent steam turbine rotor, and, used 12% chromium steel along with high temperature trend for steam, this owing to it at the excellent properties aspect hot strength and the toughness.In this kind rotor, for the two, used 12% identical chromium steel for the high-temperature part that is exposed to high-temperature steam and the low temperature part that is exposed to Low Temperature Steam.But because rotor has become bigger in recent years, thus utilize a kind of material make rotor with satisfy high-temperature part and low temperature partly the two characteristic also become increasingly difficult and costliness.

Though 12% expensive chromium steel satisfies the required heat resistance of the part that is exposed to high-temperature steam, creep properties etc., as long as keep necessary toughness just need not use this kind expensive material to be used for the low temperature part.In order to tackle these problems, attempted through welding the rotor portion of different materials linked together and processed single rotor.

Summary of the invention

Exemplary but in the non-restrictive example first; The present invention relates to a kind of turbine rotor; It comprises the axis of elongation that has the HP zone at least; This HP zone has first axial section and second axial section that supports the 2nd grade of rotor wheel of the 1st grade of rotor wheel of supporting, and first axial section is formed by the material of relative higher temperature performance and second axial section is formed by the material of relatively lower temp performance; And the device that is used for mechanically connecting first axial section and second axial section.

On the other hand; The present invention relates to comprise the turbine rotor of the axis of elongation; This axis of elongation comprises HP and IP zone at least; Combined type HP/IP zone has first section of the 1st grade of rotor wheel of supporting and second section of the 2nd grade of rotor wheel of supporting at least, and first section is formed by the material of relative higher temperature performance and second section is formed by the material of relatively lower temp performance; And wherein, (or joint coupling) links through mechanical coupling for said first section and second section.

The accompanying drawing that at present will combine hereinafter to identify is described the present invention.

Description of drawings

Fig. 1 is the schematic representation according to the turbine rotor area with mechanical coupling formula section of the first exemplary but non-limiting example;

Fig. 2 is similar to Fig. 1 but the schematic representation that between turbine, has alternative mechanical coupling according to exemplary but non-limiting example;

Fig. 3 is similar to Fig. 2 but the schematic representation that between turbine, has alternative mechanical coupling according to exemplary but non-limiting example;

Fig. 4 is similar to Fig. 3 but the schematic representation that between turbine, has alternative mechanical coupling according to exemplary but non-limiting example;

Fig. 5 is similar to Fig. 4 but the schematic representation that between turbine, has alternative mechanical coupling according to exemplary but non-limiting example; And

Fig. 6 is similar to Fig. 5 but the schematic representation that between turbine, has alternative mechanical coupling according to exemplary but non-limiting example.

List of parts

10 rotors

12 HP/IP zone

14 first order rotor wheel

15 hub portions

16 second level rotor wheel

18,20 wheel blades (bucket) in a row

22,24 rotor sections

26,28 radial flanges

30,32 fastening pieces

34 end sections

36 blind holes

38 fastening pieces

40 studs (stud)

42 blind holes

44 through holes

46 threaded end

48 opposite ends

50 nuts

51 flanges

52 public type splines (spline)

54 parent form splines

56 spline notches

58 elongation ribs

60 public type splines

62 ribs

64 parent form splines

66 aligned notches

Embodiment

At first referring to Fig. 1; Steam turbine rotor 10 illustrates with the sketch form and comprises (or combined type HP and middle pressure (IP) zone) 12, high pressure (HP) zone at least; This zone 12 forms and comprises first order rotor wheel 14 and second level rotor wheel 16 at least, and each person in them supports row's

wheel blade

18,20 respectively.In HP or combined type HP/IP zone 12, rotor 10 is formed in the

section

22,24 of two axial orientation and aligning.Section 22 comprises first order rotor wheel 14 and section 24 comprises second level rotor wheel 16.With what recognize be, section 22 is in the high-temperature area, and being exposed to temperature is about 1050 ° of F and higher steam.On the other hand, section 24 is in the lower temperature region, and being exposed to temperature is about 1050 ° of F and lower steam.

The inventor has recognized that, through in HP or combined type HP/IP zone 12, using material different can save cost significantly for

rotor section

22,24.

For rotor section 22, comparatively expensive 12%Cr material (for example, ASTM A982, B level) is fit to, and for section 24, the Cr material of lower-cost low percentage (%) for example Cr-MO-V material (for example, ASTM A470, D level, 8 types) is fit to.

During

rotor section

22 and 24 is preferably arranged through some suitable mechanical coupling any links together.In Fig. 1; For example;

Rotor section

22 and 24 provide (or being formed with) sagittal plane to flange 26; 28, they be positioned at respectively between the first rotor wheel 14 and the second level rotor wheel 16 and through circumference array extend axially that bolt 30 that fastening piece for example passes flange links and fixing through nut 32.

Fig. 2 shows alternative linkage arrangement, wherein, has removed radial flange 28 and flange 26 and has used

similar fasteners

30,32 directly to be bolted in the hub portion 15 of rotor wheel 16.

Another mechanical coupling that Fig. 3 shows between

rotor section

22,24 is arranged.In this exemplary embodiment, the diameter of section 24 reduces end sections 34 and is accommodated in the blind hole 36, and this blind hole 36 is formed in the section 22 and is in vertically between the rotor wheel 14,16.The section that connects is through fixing about rotor longitudinal axis radially directed two or three fastening pieces (for example bolt) 38.

Fig. 4 shows another exemplary embodiment, and wherein the stud 40 of band portion screw thread extends between the rotor section 22,24.Particularly, threaded blind hole 42 is formed in the end of rotor section 24, aims at the level and smooth through hole 44 in being formed on rotor section 22.Stud 40 inserts and passes level and smooth through hole 44 and the threaded end 46 of stud is screwed in the blind hole 42.Stud 40 threaded opposite ends 48 give prominence to and nut 50 are applied in place with locking column bolt 40 on it from rotor section 22, and

section

22,24 links together between

rotor wheel

14,16 vertically.As alternative, the smooth of stud 40 possibly not reach flange 51 as yet and just stops, and that independent bolt can be screwed in the end in hole 44 is in place with the locking column bolt.

Fig. 5 shows the another exemplary mechanical coupling that adopts spline to arrange.Particularly, the public type spline 52 that reduces of diameter is formed on an end of rotor section 24.Parent form spline 54 is formed in the rotor section 22, has through aiming at the elongation notch (complementary splines notch also promptly) 56 with the elongation rib 58 of admitting public type spline 52.As in the aforementioned embodiment, connection occurs between the

rotor wheel

14,16.

Fig. 6 shows the modification of the splined among Fig. 5.Here, the public type spline 60 of rotor section 24 is an X-shape, has the rib 62 that four equi-spaced apart are opened.Similarly be that the parent form spline 64 in the rotor section 22 is formed with four aligned notches 66 of taking in rib 62.

For the embodiment shown in Fig. 5 and Fig. 6, with what recognize be, spline arranges and can put upside down, wherein, public type spline is arranged in rotor section 22 and the parent form spline is on the rotor section 24.

Other mechanical coupling is arranged also within the scope of the invention.In all scenario, need prevent that all the safety of relative rotor section rotation from axially connecting.

Although the present invention has combined currently to think the most practical and preferred embodiment is described; But be understood that; The present invention is not limited to the disclosed embodiments, but opposite, the invention is intended to contain the spirit and interior various modification and the equivalent arrangements of scope that are included in accompanying claims.

Claims

1. a turbine rotor (10) comprising:

At least the axis of elongation that comprises HP zone (12); Said HP zone has first axial section of the 1st grade of rotor wheel of supporting (14) and second axial section of the 2nd grade of rotor wheel of supporting (16), and said first axial section is formed by the material of relative higher temperature performance and said second axial section is formed by the material of relatively lower temp performance; And

Be used for mechanically connecting the device (26,28,30,32) of said first axial section and said second axial section.

2. turbine rotor according to claim 1 is characterized in that the material of said relative higher temperature performance comprises the 12%Cr material.

3. turbine rotor according to claim 1 is characterized in that the material of said relatively lower temp performance comprises the CrMoV material.

4. turbine rotor according to claim 2 is characterized in that the material of said relatively lower temp performance comprises the CrMoV material.

5. turbine rotor according to claim 1 is characterized in that, said first axial section and said second axial section are connected between said the 1st grade of rotor wheel (14) and said the 2nd grade of rotor wheel (16).

6. a turbine rotor (10) comprising:

At least the axis of elongation (10) that comprises HP and IP zone; Combined type HP zone (12) has first section of the 1st grade of rotor wheel of supporting (14) and second section of the 2nd grade of rotor wheel of supporting (16), and said first section is formed by the material of relative higher temperature performance and said second section is formed by the material of relatively lower temp performance; And

Wherein, said first section and said second section link through mechanical coupling (26,28,30,32).

7. turbine rotor according to claim 7 is characterized in that, said mechanical coupling comprises a plurality of bolts (30) that are positioned at the adjacent flanges (26,28) on said first section and said second section and pass said adjacent flanges.

8. turbine rotor according to claim 7; It is characterized in that; Said mechanical coupling comprises and is positioned at the flange (26) that engages with hub (15) said the 2nd grade of rotor wheel (16) on said first section, and a plurality of bolts (30) that pass said flange and said hub.

9. turbine rotor according to claim 7; It is characterized in that; Said mechanical coupling comprises that one diameter in said first section and said second section reduces end (34), and said diameter reduces end (34) and is accommodated in another the blind hole (36) in said first section and said second section.

10. turbine rotor according to claim 7; It is characterized in that; Said mechanical coupling comprises first hole (44) of passing said first section and is positioned at second blind hole (42) on said second section, and stud (40) extends between said first hole and said second blind hole.

11. turbine rotor according to claim 10 is characterized in that, said stud (40) is screwed in the said blind hole (42).

12. turbine rotor according to claim 6 is characterized in that, said mechanical coupling comprises public type spline (52), and said public type spline (52) is from said second section extension and be accommodated in the parent form spline (54) that is arranged in said first section.

13. turbine rotor according to claim 12 is characterized in that, said public type spline (60) is formed with four radially projecting teeths (62), around spaced apart roughly 90 ° of the spin axis of said turbine rotor.

14. turbine rotor according to claim 7 is characterized in that, the material of said relative higher temperature performance comprises the 12%Cr material.

15. turbine rotor according to claim 7 is characterized in that, the material of said relatively lower temp performance comprises CrMoV.