EP3561234A1 - Rotor pourvu de dispositif d'étanchéité - Google Patents

Rotor pourvu de dispositif d'étanchéité Download PDF

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Publication number
EP3561234A1
EP3561234A1 EP18169222.9A EP18169222A EP3561234A1 EP 3561234 A1 EP3561234 A1 EP 3561234A1 EP 18169222 A EP18169222 A EP 18169222A EP 3561234 A1 EP3561234 A1 EP 3561234A1
Authority
EP
European Patent Office
Prior art keywords
rotor
sealing surface
closing element
cover
engagement portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18169222.9A
Other languages
German (de)
English (en)
Other versions
EP3561234B1 (fr
Inventor
Kevin KAMPKA
Peter Schröder
Joana VERHEYEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP18169222.9A priority Critical patent/EP3561234B1/fr
Publication of EP3561234A1 publication Critical patent/EP3561234A1/fr
Application granted granted Critical
Publication of EP3561234B1 publication Critical patent/EP3561234B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3007—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type
    • F01D5/3015—Fixing blades to rotors; Blade roots ; Blade spacers of axial insertion type with side plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/005—Sealing means between non relatively rotating elements
    • F01D11/006—Sealing the gap between rotor blades or blades and rotor

Definitions

  • the invention relates to a rotor of a gas turbine with a sealing arrangement with respect to the sealing of a mounting space between two arranged in front of a rotor disk cover.
  • Gas turbine rotors generally comprise a plurality of rotor disks, at least a portion of the rotor disks being intended to receive the rotor blades.
  • the corresponding rotor disk has a plurality of blade retaining grooves distributed in the circumference.
  • the end face of the blade retaining grooves is fluidically separated from the hot gas flowing through the gas turbine, since as a rule cooling air is passed through the blade retaining grooves.
  • the rotor disks usually have sealing plates distributed in the periphery in front of the end face, which are fastened to the rotor disk and / or the rotor blades.
  • the inner edge section of the sealing sheets facing the rotor disk engages in a circumferential annular groove.
  • the side facing away from the rotor disk side of the inner edge portion abuts a flank of the annular groove.
  • the sealing plates are designed to overlap in the circumferential direction and to each other are displaceable.
  • the necessary space can be created after installation of all sealing plates to use the last blade can.
  • the sealing plates are pushed in the circumferential direction to block, wherein between two sealing plates, a larger gap in the width of Schaufelhaltnut formed. After mounting the last blade, the sealing plates are distributed evenly around the circumference.
  • Object of the present invention is therefore to improve the seal by means of the sealing plates on the annular groove or the Ringsegmentnut.
  • the generic rotor is particularly preferably used in a gas turbine. Independently of this, however, the embodiment can also be used in other types of rotary machines. At least the rotor comprises at least one rotor disk. In this case, this rotor disk has a plurality of blade holding grooves axially penetrating the rotor disk distributed in the circumference. Adjacent to the rotor disk, the rotor further comprises a rotor component, wherein it is irrelevant in this regard whether the rotor component is likewise a bladed rotor disk or is another annular member. Furthermore, the generic rotor comprises a plurality of blades, which are each secured with a blade root in the blade retaining grooves. At the blade root, a blade platform adjoins, which extends in the circumferential direction and axially and in this case usually projects beyond an end face of the rotor disk. Starting from the blade platform, an airfoil extends radially outwards.
  • the rotor has, in a first generic embodiment, a circumferential annular groove, which can be arranged both in the rotor disk and in the rotor component. At least the annular groove is in this case designed to open radially outwardly and, viewed in the axial direction, therefore, has a flank extending on both sides in the circumferential direction and substantially radially. One of these two flanks forms a sealing surface.
  • the generic rotor has the first embodiment with the annular groove and the second embodiment with the ring segment grooves at the same time.
  • the rotor comprises at least a first cover element and at least one second cover element.
  • the two cover elements can in this case be designed as identical parts or different from each other.
  • At least the first cover element has at least one first engagement section, which engages in the annular groove or in the ring segment groove.
  • the second cover element has at least one second Engagement section, which also engages in the annular groove or in the Ringsegmentnut. Both cover elements are in this case in the region of the engagement portion of the sealing surface of the annular groove or the Ringsegmentnut.
  • the generic rotor in the area between the two cover a mounting space, which is usually required for mounting the cover and the blades.
  • the mounting space adjoins the sealing surface and extends in the circumferential direction of an edge adjacent to the sealing surface in the circumferential direction of the cover to the opposite to the sealing surface adjacent edge of the adjacent cover.
  • the corresponding edge does not have to be in the circumferential direction around the end of the cover element.
  • the cover elements each have an inner engagement section mounted in the annular groove, which extends to point towards the rotor axis. Between the inner engaging portions of the cover there is an internal mounting space.
  • the cover members each have a mounted in the Ringsegmentnut outer engagement portion, which extends radially outwardly extending. Between the outer engagement portions of the cover there is an outer mounting space.
  • the tightness in the region of the annular groove or in the region of the annular segment groove is now improved by a closing element being used.
  • the closing element is attached to the first engagement portion and extends in the circumferential direction in sections to the adjacent engagement portion. It is essential here that the closing element covers the mounting space between the two cover elements adjacent to the sealing surface at least during rotation of the rotor. This is the case if, in a radial viewing direction, the closing element or the Assembly gap of the underlying groove bottom of the annular groove or the Ringsegmentnut is covered.
  • the closing element is attached to the first inner engagement portion and in this case abuts the second inner engagement portion upon rotation of the rotor. Accordingly, the inner mounting space is substantially closed.
  • the closing element is advantageously arranged on the side facing the rotor axis, below the engagement sections, so that the centrifugal force in the closing element presses it against the engagement sections.
  • the closing element is adjustably mounted on the first outer engaging portion, wherein the rotation of the rotor leads to an adjustment of the closing element with an attachment in the circumferential direction on the second engagement portion and / or with an abutment in the radial direction on the groove bottom of the Ringsegmentnut.
  • the closing element is advantageously arranged at the edge in the circumferential direction and at the same time at the radially outer edge.
  • a cover member has a distance from the sealing surface, i. on the facing to an end face of the rotor disc, rear tab element on the other hand, and the adjacent cover member has a front tab element on.
  • the front tab element partially overlaps the rear tab element, wherein furthermore the front tab element bears against the sealing surface.
  • the rear tab element is arranged on the second cover element and the front tab element on the first cover.
  • the embodiment with an arrangement of the rear tab element on the first cover element, to which the closing element is fastened in the region of the engagement section is particularly preferred.
  • the front tab element is arranged on the second cover element.
  • the mounting space is between the circumferentially exposed free end of the front tab member and circumferentially opposed to a shoulder on which the rear tab member begins.
  • the mounting space extends viewed in the axial direction of the sealing surface to the rear tab member.
  • the cover For mounting the rotor is hereby usually possible to move the cover in the circumferential direction such that the mounting space is reduced substantially to zero and thus completely overlap the front tab member and the rear tab member. This makes it possible that distributed in the circumference between two cover a larger gap, for example, for mounting a blade arises.
  • each cover member at one end in the circumferential direction has a front tab member and at the other end in the circumferential direction has a rear tab member.
  • the closure element is advantageously in contact with the tab element at least on rotation of the rotor on the side facing the rotor axis, since these limit the assembly space on three sides.
  • a receiving profile extending in the axial direction is arranged on the first engagement portion.
  • the receiving profile penetrates the engagement portion in the axial direction.
  • the receiving profile is made open to the rotor axis.
  • the receiving profile may be in the form of a T-slot or the like.
  • the closing element on a holding profile, which is fixed in the receiving profile.
  • the retaining profile is designed to be complementary to the receiving profile.
  • the closing element In order to effect the adjustment of the closing element during rotation of the rotor in the second embodiment with a contact of the closing element on the second outer engagement portion and / or the groove bottom of the Ringsegmentnut advantageous, it is advantageous if in the first outer engagement portion is a diagonal in the circumferential direction and at the same time in the radial direction réelleckende guide groove is present. In this, the closing element may be slidably received, so that the closing element can adjust outward in the rotation of the rotor and in the circumferential direction.
  • the length of the closing element in the circumferential direction is limited to 0.5 times the length of the first cover member and to 0.5 times the length of the second cover member. It is particularly advantageous if the length of the closing element corresponds at most to 0.3 times the length of the covering element in the circumferential direction in the region of the annular groove.
  • the length of the closing element in the circumferential direction is greater than twice the length of the mounting space considered in the same direction. Taking into account the holding profile and thus the free length of the closing element from the holding profile to the free end of the closing element, it is analogously advantageous if the free length is greater than 1.5 times the length of the mounting space is. Thus, it can be ensured that the mounting space is reliably covered and is given to the three circumferential sides of a contact with the engagement portions of the two cover elements.
  • the width of the closing element in the axial direction in the region of attachment of the closing element to the first engaging section corresponds to at least 0.95 times the thickness of the first engagement section at the same location.
  • the movement space of the closing element in the axial direction relative to the engaging portion is very limited.
  • the width of the closing element in the region of the attachment corresponds at least to 0.99 times the thickness of the first engagement section.
  • the width of the closing element viewed in the axial direction is not unnecessarily large, but rather sufficient to cover the mounting space and safe Installation of the closing element, in particular on the rear tab element. Therefore, it is advantageous if the width of the closing element corresponds to a maximum of 0.95 times the thickness of the annular groove apart from their attachment to the first engagement portion and thus at least in the region of the assembly space. It is particularly advantageous if the width corresponds at most to 0.8 times the thickness of the annular groove. This is regarded as sufficient to cover the mounting space and to ensure the necessary stability and, in contrast, allows easy mounting and avoids unnecessary weight.
  • FIG. 1 is shown in a longitudinal section of the rotor in the region of the cover 11.
  • the closing element 21 which is essential for the invention can not be recognized and, to that extent, this representation does not differ from the generic state of the art.
  • the rotor disk 01 can be seen with a blade holding groove 02 extending axially through the rotor disk 01.
  • a plurality of cover elements 11 are distributed in front of an end face of the rotor disk 01 and in front of the blade holding grooves 02.
  • the arrangement of a rotor component 06 is adjacent to the rotor disk 01 to recognize.
  • the rotor component 06 has a circumferential annular groove 07, which opens axially outwardly. Consequently, the annular groove 07 viewed in the axial direction has a front edge and a rear edge.
  • the cover 11 are each received with an inner engagement portion 12.
  • FIG. 2 shows the Fig. 2 in a further perspective view, a view of the gap between 2 cover elements 11a and 11b.
  • the first cover 11a on the right in the representation in the circumferential direction of the edge, a rear tab member 13, which is arranged on the side facing the rotor disk 13 13.
  • This 13 is overlapped by a front tab member 14, which is 14 arranged on the circumferentially left edge of the adjacent second cover member 11 b.
  • an inner mounting space 09 is formed between the edge of the front tab member 14 and the paragraph from which the rear tab member 13 begins.
  • the inner mounting space 09 is required to move the cover 11 in the circumferential direction so far that a sufficient clearance to Assembly of the last blade in the blade retaining groove 02 is present.
  • the area between the cover elements 11 and the rotor disk 01 is supplied with cooling air, which as a rule flows through the blade retaining grooves 02 into the individual rotor blades.
  • a closing element 21 is used, which covers 21 the remaining inner mounting space 09 in the best possible way.
  • the closing element 21 is fastened to the first cover element 11a on the first inner engagement section 12a and rests on the side facing the rotor axis on the second inner engagement section 12b of the second cover element 12b.
  • the closing element 21 has a complementary retaining profile 22 which is fastened in the receiving profile.
  • the actual function fulfills the closing element 21 by its abutment on the side facing the rotor axis at the first inner engagement portion and the second inner engagement portion, or in particular at the bottom of the rear tab member 13 and the front tab member 14th
  • the length of the closing element 21 in the circumferential direction is chosen to be significantly smaller than the length of the individual cover elements 11. This facilitates assembly and reduces the weight of this embodiment, as if a circumferential piston ring would be used.
  • the cover 11 with the inner engagement portions 12 and the closing element 21 sealingly abut a flank of the annular groove 07.
  • the pioneering of the rotor disk 01 flank of the annular groove 07 forms a sealing surface 08.
  • the closing element 21 also abuts against the sealing surface 08.
  • Fig. 6 is again sketched in a perspective view, the cover 11, which 11 is used in this embodiment as a common part for the first cover 11 a and the second cover 11 b.
  • the cover 11 which 11 is used in this embodiment as a common part for the first cover 11 a and the second cover 11 b.
  • the rear tab member 13 is also sketched in a perspective view, the cover 11, which 11 is used in this embodiment as a common part for the first cover 11 a and the second cover 11 b.
  • the rear tab member 13 on one side in the circumferential direction, the front tab member 14 opposite side and the inner engagement portion 12 with the receiving profile 16th
  • the two adjacent cover elements 11a and 11b can be seen. Radially outside the cover element 11 is the blade platform 36 of the blade 35. In the blade platform 36 is located on the side facing the rotor axis Ringsegmentnut 37, wherein the side facing away from the rotor disk edge of the Ringsegmentnut 37 forms a sealing surface 38. In the Ringsegmentnut engages an outer engagement portion 15 of the cover 11 a.
  • the cover 11 are at their push in Circumferentially executed overlapping, wherein the first cover member 11a has a rear tab member 13 and the adjacent second cover member 11b has a rear tab member 13 superior front tab member 14.
  • the first cover 11a has, as again in Fig. 9 represented, in the first outer engagement portion 15a on a guide groove 17, which is 17 aligned here diagonally to an outer mounting space 10. It is easy to see how the closing element 25 can be completely inserted into the guide groove 17 for mounting the sealing plates and blades, so that the cover 11 are completely pushed together in the circumferential direction can. In the position of use of the cover 11 creates an outer mounting space 10 between the cover 11. This mounting space 10 leads, in particular in the region of the outer engagement portions 15 in the Ringsegmentnut 37 to a gap through which cooling air can escape.
  • the Fig. 12 schematically shows a second variant of the first embodiment of the Fig. 1 to 7 analogous to the representation in Fig. 4 , Evident is the inner engagement portion 42 of the cover 41 with the receiving profile 46.
  • the closing element 51 On the side facing the rotor axis, the closing element 51 is arranged, which engages 51 with a retaining profile 52 in the receiving profile 46.
  • the inner engagement portion 42 is mounted with the closing element 51 in an annular groove 07 of the rotor disk 01.
  • the closing element 51 is sketched, the length in the circumferential direction over the length of the cover 41 extends beyond and thus two mounting clearances can be covered at the same time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP18169222.9A 2018-04-25 2018-04-25 Rotor pourvu de dispositif d'étanchéité Active EP3561234B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18169222.9A EP3561234B1 (fr) 2018-04-25 2018-04-25 Rotor pourvu de dispositif d'étanchéité

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18169222.9A EP3561234B1 (fr) 2018-04-25 2018-04-25 Rotor pourvu de dispositif d'étanchéité

Publications (2)

Publication Number Publication Date
EP3561234A1 true EP3561234A1 (fr) 2019-10-30
EP3561234B1 EP3561234B1 (fr) 2020-10-07

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ID=62063397

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EP18169222.9A Active EP3561234B1 (fr) 2018-04-25 2018-04-25 Rotor pourvu de dispositif d'étanchéité

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EP (1) EP3561234B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015193033A1 (fr) * 2014-06-16 2015-12-23 Siemens Aktiengesellschaft Rotor pourvu de tôles d'étanchéité
EP2975218A1 (fr) * 2014-07-17 2016-01-20 Siemens Aktiengesellschaft Assemblage de disque de roue

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015193033A1 (fr) * 2014-06-16 2015-12-23 Siemens Aktiengesellschaft Rotor pourvu de tôles d'étanchéité
EP2975218A1 (fr) * 2014-07-17 2016-01-20 Siemens Aktiengesellschaft Assemblage de disque de roue

Also Published As

Publication number Publication date
EP3561234B1 (fr) 2020-10-07

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