EP3350416A1

EP3350416A1 - Gas turbine with improved mounting of the inner housing

Info

Publication number: EP3350416A1
Application number: EP16790918.3A
Authority: EP
Inventors: Andre Botzen; Manfred Hartmann; Matthias Kleinenhammann; Jens Krause; Philippos Theodoros Mavrommatis; Milan Schmahl; Michael Winterstein
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2015-11-11
Filing date: 2016-10-26
Publication date: 2018-07-25
Anticipated expiration: 2036-10-26
Also published as: DE102015222172A1; EP3350416B1; DE102015222172B4; WO2017080826A1

Abstract

The invention relates to a gas turbine having a compressor, a mid-section and a turbine, wherein a diffusor (11) is arranged at the end of the compressor. This diffusor (11) comprises a diffusor housing section (12) partially surrounding the rotor (06) in the mid-section, wherein an inner housing (21) partially surrounding the rotor (06) is subsequently arranged. The inner housing (21) can move in a limited manner in the axial direction relative to the diffusor housing section (12), wherein the movement in an opposing direction is limited by the contact of a diffusor contact surface (15) on an inner contact surface (24). According to the invention, in order to reduce the maintenance costs, the diffusor contact surface (15) and/or the inner contact surface is arranged on a removable wear attachment (14).

Description

description

The invention relates to a gas turbine with a compressor, a central section and a turbine, wherein a diffuser adjoining the compressor and an inner housing communicating with the diffuser are arranged in the region of the central section.

Gas turbines comprising a compressor, a central section and a turbine are well known from the prior art and there is no further explanation in this respect.

In the present case, particular consideration is given to the arrangement of a diffuser following the compressor and to an inner housing arranged in the region of the central section. In this case, the diffuser partially surrounds the rotor of the gas turbine in the area of the middle section. The further section in the area of the middle section from the diffuser to the turbine is usually covered by an inner housing. Due to the thermi ^¬'s expansions of the individual components of the gas turbine, an axial expansion compensation between the In nengehäuse and the diffuser is allowed in most cases. In this respect, they can not be linked together. To avoid an open gap, the diffuser overlaps the inner housing, where ^¬ intervenes at a web on the inner housing in a wider groove in Diffu ^¬ sor.

To limit the axial movement of the inner housing in the operation of the gas turbine, it is also known to provide a Begren ^¬ tion device, which limits the axial play of the inner housing relative to the diffuser housing. This will be, especially for the sake of simpler

Assembling, the web on both sides superior ^grub screw ^¬ selected, which the movement of the inner housing rela ^¬ tive to the diffuser by the system of the grub screw in a Flank of the limiting groove limited. To a slight

Of assembly of the diffuser on the inner housing provides leis ^¬ th to is fusor largest possible nor tolerable axial play between the flanks of limiting groove on dif- and selected the two ends of the grub screw.

A problem has, however, been found that in al ^¬ ler regulating the axial play between the grub screw and the flank of the limiting groove is chosen too large, so that the inner housing moves too far in the axial direction and at other points, a reduction of required cooling air gaps causes. Furthermore, it has proven to be particularly disadvantageous that the installation of the grub screw on the flank of the groove leads to damage of the flank, which in turn leads to the necessity of costly reworking.

Object of the present invention is therefore to reduce the connection between the diffuser and the inner housing in terms of the total cost of installation and maintenance.

The object is achieved by an inventive from ^¬ guide die according to the teaching of claim 1. Advantageous embodiments are the subject of Unteran ^¬ claims.

The generic gas turbine initially has a compressor, a central section and a turbine. The embodiment of the compressor and the turbine are ways ^¬ Lich the embodiment according to the invention initially irrelevant, so that can be resorted to best embodiments of the prior art. At least the compressor, the center section and the turbine together comprise a rotor, which thus penetrates into the gas turbine. The concrete embodiment of the rotor is also respects ^¬ Lich the embodiment according to the invention initially irrelevant, so that in this respect proven embodiments can be used from the prior art. It is at least necessary that a diffuser is subsequently arranged in the area of the middle section on the compressor. The diffuser here has the task of deflecting the air flow from the compressor, so that it can be advantageously fed to a combustion chamber.

In this case, the diffuser has a diffuser housing section surrounding the rotor in sections in the middle section. In this respect, the diffuser housing section separates the airflow exiting the compressor from the rotor. Subsequent to the diffuser housing section is located in the Mittelsek ^¬ tion a rotor sections surrounding the inner housing. In this case, it is generically provided that the inner housing can move axially relative to the diffuser housing section, wherein the movement path in the axial direction is limited. For this purpose, the diffuser housing section has at least one diffuser contact surface and the inner housing has at least one inner contact surface. A plant of the diffuser contact surface on the inner bearing surface causes a limitation of the axial movement in a direction away from each other direction of movement. Furthermore, it is generically provided that either the diffuser bearing surface relative to

Diffuser housing section is adjustable or that the inner contact surface is arranged relative to the inner housing adjustable. Although the adjustability of the inner contact surface or of the diffuser contact surface is functional enough, it can likewise be provided that both contact surfaces can be adjusted.

To improve the connection between the inner housing and the diffuser is now provided according to the invention that at least one contact surface angeord ^¬ net on a wear supplement. Here, it is necessary that the Verschleißbei- would be solved, so that it may be possible a ^¬ times, in particular without reworking other components, it ^¬ sets during maintenance. In this case, in a first embodiment according to the invention, it is possible to arrange the diffuser ^contact surface on the wear ^element , with the wear ^insert correspondingly being detachably arranged on the diffuser housing section.

In a second embodiment of the invention, it is alternatively possible to arrange the inner bearing surface on a wear ^¬ side dish, in which case the Verschleißbeila ^¬ ge is detachably to be arranged on the inner housing.

The wear supplement allows for easy replacement of this wear supplement in case of wear, without the need for reworking the otherwise fixed Be ^¬ marginal surfaces.

It is particularly advantageous if the ^{Verschleißbeila ¬} ge screwed to the diffuser housing ^portion or on Innengehäu ^¬ se is attached. Thus, in the case of maintenance, a quick replacement of the wear supplement can be guaranteed.

To limit the movement of the inner housing in the axial direction in a direction away from each other direction, it is also advantageous if in the cold state of the gas turbine during assembly of the diffuser on the inner housing, the adjustable contact surface is adjusted such that the distance between the diffuser bearing surface and the inner bearing surface between 0.01 mm and 2 mm. A minimum clearance is required to allow collision-free mounting of the diffuser. In addition, the distance should, however, be chosen as small as possible, with a distance of less than 2 mm being advantageous.

Particularly advantageous, however, is when the distance Zvi ^¬ rule the diffuser contact surface and the inner contact surface see be- is 0.2 mm and 0.8 mm. The minimum distance of 0.2 mm ensures the collision-free mounting of the diffuser on the inner ^¬ housing even with slight transverse movements during the assembly process. The maximum distance of 0.8 mm ensured In addition, in a particularly advantageous manner, a ^¬ smallest possible displacement of the inner housing in the axial direction, so that sealing of subsequent cooling air gaps is reliably prevented by a displaced inner housing.

Through the use of a wear supplement for the realization of a contact surface improved coordination between the diffuser and the inner housing is made possible. Due to the now selected wear supplement, it is possible that

Slit image in the axial direction compared to previous slit images to reduce, so that an early investment of Anla ^¬ surfaces is allowed to each other, so that the axial movement ^{¬ movement of} the inner housing in the axial direction in a direction facing away from each other is limited early, so that a subsequent reduction of a cooling air gap is prevented by an inadmissible displacement of the inner housing.

There are still various options available for the realization of the investment areas. With regard to the side opposite the wear insert abutment surface, it is particular ^¬ It benefits in, if this is arranged at the end face on the head of an adjusting screw. Thus, the optimum distance between the diffuser contact surface and the inner contact surface can be adjusted in a simple ^manner by adjusting the adjusting screw. In the implementation of the invention ^shown SSE embodiment is to be considered, so that, for arrangement of the diffuser contact surface on the wear insert in particular ^¬ DERS Advantageously, the inner contact surface to be arranged on the end side on the head of the adjusting screw. In contrast, about ^¬ is in an inventive arrangement of the Innenanla- gefläche on the wear insert the diffuser contact surface on the end face on the head of the adjusting screw to arrange. It is particularly advantageous if the contact surface speaks to ent ^¬ ^¬ least 125% of the cross-section of the adjustment screw. Due to the arrangement of the contact surface on the front side of the head of the adjusting screw and in the event of lung a sufficient size of the head with the adjusting screw and thus the contact surface is ensured that no entry before ^¬ while wear on the wear insert. It should occur in a particularly advantageous manner in vibration ^¬ caused friction between the inner bearing surface and the diffuser bearing surface of the wear primarily on the wear ^¬ supplement and wear on the front side at the head of the adjusting be avoided. In this respect, the advantageous wear supplement on a lower hardness than the head of the adjusting screw.

An advantageous arrangement of the adjusting screw is he ^¬ aims, if one of the components to be connected has a limitierungssteg. In this limiting pin the adjusting screw is arranged axially adjustable in particular bar ^¬ ^¬ DERS advantageous manner. For this purpose, in a first variant, the diffuser housing section can have at least one boundary web extending in the direction of the rotor. In an alternative second variant, the inner housing has at least one boundary web extending away from the rotor.

In particular for accommodating the wear insert comprises, in some exemplary prior ^¬, one of the two components a limiting groove in which the Ver ^¬ schleißbeilage is arranged in a particularly advantageous manner. The arrangement of the wear ^¬ supplement in the Begrenzungsnut leads to a reliable storage of the wear supplement and a secure support thereof. In a first variant, the inner housing has at least one limiting groove opening away from the rotor. Alternatively, in a second variant, the diffuser housing section has at least one delimiting groove opening toward the rotor. To support the inner housing at the diffuser at the diffuser plant contact surface on the inner bearing surface, it is theoretically sufficient ^¬ table when a single adjustment screw is ^¬ hands. However, reliable support without ne lateral load on the inner housing or on the diffuser achieved only at a plurality of adjusting screws. Therefore, it is particularly advantageous if at least 12 circumferentially distributed adjusting screws are used.

For this purpose, it is analogous possible to use a single wear supplement, at which abut the individual contact surface or the Mehr ^¬ number of contact surfaces. However, it is particularly advantageous with regard to the arrangement of the wear shims to surround the rotor when two particularly advantageous four wear shims are used, which are each designed as a ring segment. Here, the individual ring segments distributed in the circumference on the inner housing or on

Diffuser housing section are arranged. It should be noted that the number, size and arrangement of the segmented wear shims makes it possible to apply all the contact surfaces arranged on the adjusting screws.

In order to reduce formation of a gap between the diffuser and the inner casing to a minimum and the central axis of rotation position, in particular the inner housing sicherzustel ^¬ len, it is furthermore advantageous if the inner housing rela ^¬ tive to the diffuser in the periphery can be supported. It is advantageous if between the

Diffuser housing portion and the inner housing at least one detachable Zentrierbeilage is arranged, which causes a Zentrie ^¬ tion of the components to each other. By this Zentrierbeilage the support and centering, in particular of the inner housing can be effected. Because of the thermal elongation voltages and the axial displacement of the inner casing re ^¬ tively to the diffuser, the centering of the inner housing leads relative to the diffuser body portion to a friction between the components. The advantageous use of a detachable centering shim favors the replacement of the centering shim in case of wear.

To secure the position of the Zentrierbeilage between the

Diffuser housing section and the inner housing will this in arranged advantageously in the Begrenzungsnut, wherein the boundary web rests with its outer periphery of the Zentrierbeilage. In this respect, the centering of the inner ^¬ takes place housing relative to the diffuser by a system of the outer circumference of the boundary web with intermediate Zentrierbei ^¬ position on the groove bottom of the boundary groove.

To prevent axial movement of the Zentrierbeilage within the Begrenzungsnut the position of the Zentrierbeilage is gesi ^¬ chert by the wear supplement advantageously. Here, the position of the centering ^¬ rierbeilage by mounting the wear insert in axia ^¬ ler direction can be secured by suitable means. For this purpose, it is especially before ^¬ geous when the Zentrierbeilage zumin- on an end face having a least along a flank of the limiting groove he ^¬ stretching retaining tab. Here, a bag is arranged in vorteilhaf ^¬ ter manner in the wear supplement or in the flank of Be ^¬ grenzungsnut in which engages the retaining tab. Thus, the axial position of the centering supplement can be secured by the wear supplement while the retaining tab is engaged.

For play-free connection of the inner housing with the diffuser to ensure centering of the components to each other, it is also particularly advantageous if the Zentrierbei ^¬ position in the non-installed state has a different shape from a circular shape. In this case, it is provided that the assembly of the diffuser with the inner housing results in a deformation of the centering shim, so that it subsequently assumes a substantially circular form.

How the centering shim is formed in this case is initially un ^¬ significant, provided that can be achieved by a deformability of the initially non-round Zentrierbeilage backlash-free centering of the inner nengehäuses relative to the diffuser. A particularly advantageous shape of the Zentrierbeilage in the undeformed state, for example, by a local circumferentially distributed arranged waveform of the Zentrierbeilage achieved. To this extent may be, for example, on a semi-circle, two or more waves within the Zentrierbeilage vorgese ^¬ hen, which are pressed flat during the joining of the diffuser on the inner housing so that the Zentrierbeilage in the installed state substantially corresponds to the circular shape.

In principle, it is possible to use a single centering shim which extends substantially over the entire circumference. It can thereby be provided, for example, that a transversely grooved ring for mounting is first deformed and zurückfe ^¬ changed after insertion into the restriction groove and assumes an annular shape. Particularly advantageous ^¬ way, it is, however, when at least two centering shims are used which together extend over at least 300 degrees in circumference. Thus, the two Zentrierbeilagen can be easily attached to the diffuser or on the inner housing. It is particularly advantageous if each Zentrierbeilage has a central retaining tab, in contrast, a corresponding pocket is arranged on a wear supplement, which causes the position of the Zentrierbeilage next to the backup in the axial direction as well as a determination of the position of the Zentrierbeilage in the circumferential direction. Moreover, it is advantageous if each centering supplement further comprises at least two outer retaining tabs, so that the axial position of the Zentrierbeilage is secured. For this purpose, the respective wear insert and the wear inserts zugehöri ^¬ gene to external pockets, which are increased by a deformation compensation in the circumferential direction relative to the holding tabs. This larger game of outer Ta ^¬ rule over the retaining tabs is required if during assembly of the diffuser on the inner housing, a deformation of the Zentrierbeilage takes place from a non-circular shape to a circular shape and thus shifts the position of the outer retaining tabs in the circumferential direction. In the following figures, an exemplary embodiment of a connection according to the invention between a diffuser of the gas turbine and an inner casing of the gas ^¬ turbine is outlined.

Show it:

1 shows a schematic view of a gas turbine; 2 shows a section through the gas turbine in the connection ^¬ area between the diffuser and inner housing;

3 shows a detailed view in section between the diffuser and

Inner housing in the area of the adjusting screw;

4 shows a section through diffuser and inner housing in

Area of attachment of the wear supplement;

5 shows a section through the diffuser and inner housing in

Area of a locking pin.

FIG. 1 diagrammatically shows a gas turbine 01 which comprises a compressor 03 in a known manner, a turbine 04 and a middle section 05. In this case, a rotor 06 extends through the gas turbine 01 from the compressor 03 via the middle section 05 to the turbine 04. The compressor 03 is adjoined by a diffuser 11 which causes a supply of the compressed combustion air to a combustion chamber 07.

In the following Figure 2, the center section 05 is considered in more detail, wherein first again the rotor 06 and the diffuser 11 can be seen. This 11 comprises a rotor 06 partially surrounding the diffuser housing portion 12. An inner housing 21 then surrounds the rotor 06 at these ends. The inner housing 21 is in this case movable axially relative to the diffuser housing section 12, whereby a rotatio on the components relative to each other by a locking pin 18 is prevented.

The limitation of the axial movement of the inner housing 21 relative to the diffuser housing section 12 is outlined in FIG. 3 below. Evident is again the inner housing 21, which 21 has a Be ^¬ delimiting groove 23 extending away from the rotor 06. In the limiting groove 23 a wear insert 23 is disposed a ^¬ side, which forms an inner bearing surface 23 24th At the bottom of the limiting groove 22 is a Zentrierbeilage 26 which 26 causes a Zent ^¬ tion of the components 12, 21 relative to each other.

Furthermore, it can be seen that surrounding the rotor 06

Diffuser housing section 12 with a to the rotor 06 he ^¬ stretching boundary web 13. In the boundary web 13, an adjusting screw 14 is mounted, which 14 on a head a diffuser bearing surface 15 opposite to the Innenan ^¬ position surface 24 has. The outer periphery of the boundary web 13 forms a sliding surface 25, which 25 comes to the Zentrierbei ^¬ position 26 to the plant. The adjusting screw 14 is adjusted for mounting such that when mounting the diffuser

11, an axially extending gap between 0.01 mm and 2 mm is present on the inner housing 21 between the diffuser bearing surface 15 and the inner bearing surface 24. This axial gap between the contact surfaces 15, 24 may reduce to 0 during operation of the gas turbine, so that a further movement of the inner housing 21 is limited relative to the diffuser 11 in a direction away from each other.

The securing of the position of the wear supplement 23 and the Zentrierbeilage 26 is sketched in the following Figure 4. To recognize is in turn the diffuser housing section

12 with the limiting web 13, and the inner housing 21 with the limiting groove 22. Within the Begrenzungsnut 22, the wear supplement 23 is disposed on an edge of the Begrenzungsnut 22. In this embodiment, the Ver ^¬ schleißbeilage 23 is fi by means of a fastening screw 27 xed. In the radial direction, the position of the Zentrierbeilage 26 through the fastening web 13 and the groove bottom of Be ^¬ fastening groove 22 is fixed. The axial position of the Zentrierbei ^¬ position 26 is secured by a at one end of the Zentrierbeilage 26 radially outwardly extending retaining ^¬ tab 28 secured. This 28 is held by a locking pin ^¬ .

In the following Figure 5 is again a detail view to the representation of FIG 2 outlined. To recognize in turn the diffuser housing portion 12 and the inner housing 21. To prevent rotation of the inner housing 21 relative to the diffuser 11 is provided that in the boundary web 13 in the diffuser housing portion 12 a Sperrstiftnut 19 is introduced. At a matching point this purpose, a Sperrstiftnut 29 is introduced on both sides of the boundary groove 22 of the inner housing 21. By inserting a locking pin 18, a rotation of the inner housing 21 relative to the diffuser 11 is achieved.

Claims

claims

1. gas turbine (Ol) with a compressor (03) and with a middle section (05) and with a turbine (04), which (03, 04, 05) comprise a rotor (06), wherein at the end of the compressor (03) a diffuser (11) is arranged, which (11) ei ^¬ NEN the rotor (06) in the central section (05) partially surrounding the diffuser housing portion (12), wherein the central section (05) a the rotor (06) partially surrounded Inner housing (21), which (21) in axial

Direction (12) is limited movable relative to the diffuser body portion, the diffuser shell portion (12) least at ^¬ a diffuser surface (15) and the inner housing (21) has at least one inner contact surface (24) which (15, 24) to each other, the axial in-conditioning Limit movement in a direction pointing away from each other, with the

Diffuser abutment surface (15) is arranged relative to the diffuser housing portion (12) and / or the inner abutment surface (24) relative to the Innenge ^¬ housing (21) adjustable,

characterized,

that the diffuser ^{bearing surface is} arranged on a wear ^{supplement ¬} , which is detachably, in particular screwed, arranged on the diffuser housing portion; and or

that the inner bearing surface (24) of a wear insert (23) is arranged, which releasably (23), in particular ge ^¬ screwed to the inner housing (21) is arranged.

2. Gas turbine (01) according to claim 1,

characterized,

that in the cold state the distance between the

Diffuser surface (15) and the inner contact surface (24) is Zvi ^¬ rule 0.01 mm and 2 mm, in particular between 0.2 mm and 0, 8 mm.

3. Gas turbine (01) according to claim 1 or 2,

characterized,

the diffuser contact surface (15) or the inner contact surface is attached to an end face on the head of an adjustment screw (14). wherein in particular at least 12 adjusting screws (14) is arranged, wherein the bearing surface (15) corresponds to at least 125% of the cross section of the adjusting screw (14) being attached ^¬ classified into ^¬ particular the drive at the foot of the adjusting screw (14), distributed in the circumferential available.

4. gas turbine (Ol) according to one of claims 1 to 3, characterized

the diffuser housing section (12) has at least one delimiting web (13) extending in the direction of the rotor (06), in which (13) in particular the adjusting screw (14) is adjustably arranged; and or

the inner housing has at least one ^{delimiting web} extending away from the rotor, in which, in particular, the adjusting screw is arranged.

5. Gas turbine (01) according to one of claims 1 to 4, characterized

that the diffuser housing section has at least one delimiting groove opening toward the rotor, in which the wear supplement is arranged in particular; and or

that the inner housing (21) at least one from the rotor (06) having opening away limiting groove (22) in the (22) in particular ^¬ sondere the wear insert (23) is arranged.

6. Gas turbine (01) according to one of claims 1 to 5, characterized in that

at least two, in particular four, wear pads (23) are present, which (23) are designed as ring segments.

7. Gas turbine (01) according to one of claims 1 to 6, characterized

that between the diffuser housing portion (12) and the inner housing (21) at least one releasable Zentrierbeilage (26) is arranged, which (26) causes a centering of the components (12, 21) to each other.

8. gas turbine (Ol) according to claim 7,

characterized,

in that the centering supplement (26) is arranged in the ^{delimiting groove} (22), wherein in particular the ^{delimiting web} (13) bears against the centering supplement (26).

9. gas turbine (Ol) according to claim 8,

characterized,

that the axial position of the Zentrierbeilage (26) in the limitation zungsnut (22) through the wear insert (23) is secured, in particular the Zentrierbeilage (26) on one end face at least one extending along a flank of the Be ^¬ grenzungsnut (22) Holding tab (28) which (28) is held by the wear supplement (23).

10. Gas turbine (01) according to one of claims 7 to 9, characterized

that the centering supplement (26) in the non-installed state has a shape deviating from a circular shape and in the installed state between the diffuser housing section (12) and the inner housing (21) substantially to one

Circular shape is deformed.

11. Gas turbine (01) according to claim 9 or 10,

characterized,

at least two centering shims (26) are present, which (26) extend together over at least 300 ° in the circumference, wherein a middle holding lug (28) by a belonging to ^¬ pocket on the wear supplement (23) or in an edge of the Begrenzungsnut ( 22) is centered in the circumferential direction and wherein at least two outer pockets are enlarged by at least ei ^¬ NEN deformation compensation in the circumferential direction relative to the retaining tabs (28).