EP1106785B1 - Leckstromkanal im Rotor einer Turbomaschine - Google Patents
Leckstromkanal im Rotor einer Turbomaschine Download PDFInfo
- Publication number
- EP1106785B1 EP1106785B1 EP00120564A EP00120564A EP1106785B1 EP 1106785 B1 EP1106785 B1 EP 1106785B1 EP 00120564 A EP00120564 A EP 00120564A EP 00120564 A EP00120564 A EP 00120564A EP 1106785 B1 EP1106785 B1 EP 1106785B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- turbomachine
- carrier ring
- seal carrier
- leakage
- housing
- 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.)
- Expired - Lifetime
Links
Images
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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/24—Casings; Casing parts, e.g. diaphragms, casing fastenings
- F01D25/26—Double casings; Measures against temperature strain in casings
-
- 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
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
-
- 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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/14—Casings modified therefor
- F01D25/145—Thermally insulated casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/20—Heat transfer, e.g. cooling
- F05D2260/221—Improvement of heat transfer
Definitions
- the invention relates to a turbomachine according to the preamble of the claim 1.
- the casing and the casing are generally tried Housing cladding as good as possible against that in a main flow channel isolated working gas to isolate an acceptable gap behavior to preserve the blades of the blades. It will continue to try Keep housing temperature as low as possible in order to be inexpensive To be able to use material such as steel.
- Efforts have already been made in technology to cool the housing and optimize the airflow. So describes the WO 92/17686 a turbine housing, which by the special design the housing cladding the air flow of the cooling air between the cladding and regulated outer circumference. It tries by narrowing the flow cross section over housing sections with a particularly thick Cross section to achieve increased cooling of these sections.
- leakage air flow 24 In the low-pressure turbine stage shown in a longitudinal section in FIG. 3 according to the known prior art, hot working gas is made the turbine main flow channel 6 through a connecting gap 22 in a space 5 is drawn in in the form of a so-called leakage air flow 24.
- this Room 5 mixes this leakage air flow 24 with a specifically provided one or flow of throttle air 8 introduced into this space 5, which is essentially sealing air from this low pressure turbine stage upstream high-pressure turbine stage.
- This Mixed air flow (referred to later as leakage air mixture 25) flows into an insulation space 21 via a so-called groove-nose connection 23 one between the seal carrier ring 7 and the Inner circumference of the turbine housing section 10 is provided, and in the insulating elements 19 are provided.
- the mixed air flow which is also relatively hot due to the hot leak air flow 24 flows out of this leakage air flow 24 and the throttle air 8 or penetrates the insulating elements 19 and consequently sets their insulating effect significantly lower than the housing section 10.
- the housing section 10 can thereby be overheated at worst. At least however, by guiding the leakage air flow 24, the results from the leak on the low pressure side, the insulating elements 19 the seal carrier ring 7 from all sides with air higher Temperature flows around. Their insulating effect in the direction of the housing wall thus greatly reduced. As is known, this has a negative effect on the running column and thus on the turbine efficiency, since the increased by the way Heat transfer the entire area of the turbine casing thermally is deformed faster, i.e.
- the present invention is therefore based on the object, the disadvantages to avoid the prior art and a simple and inexpensive Solution for removing those escaping from the main turbine flow channel to find hot working gases, with turbine efficiency improved and overheating of housing parts should be avoided.
- a development of the present invention according to the features of Claim 2 provides a particularly advantageous design in front. This creates an at least partially double-walled seal carrier ring generated in the leakage air flow through the double-walled Section is channeled.
- the baffle can advantageously according to the features of Claim 3 be attached to the seal carrier ring. But also other variants, such as individual tubes, longitudinally permeable metal honeycombs or metal bars are possible.
- the seal carrier ring can for example made of a nickel-based alloy, such as Inconel 718 his.
- Another advantageous embodiment of the present invention has the features of claim 4.
- the openings are arranged according to the features of claim 5.
- the openings lie at an end of the connecting gap facing the main flow channel of the turbomachine.
- a particularly advantageous embodiment of the present invention is achieved with the features of claim 6.
- the guide plate has a double function, since it also serves here as a holder for the seal carrier ring on a protruding circumferential retaining lug of the housing segment. This double function saves an additional mounting component.
- a further advantageous embodiment of the present invention has the features of patent claim 7. In a low-pressure turbine stage of a turbomachine in particular, significant increases in efficiency can be achieved by appropriately designing the seal carrier ring.
- FIG. 1 shows schematically a low pressure turbine stage of an axial turbomachine in longitudinal section.
- the main flow direction of the turbine runs here in the drawing plane from left to right, i.e. from a stator 18 to a stator 13.
- the cross section of the turbine widens conically in the direction of the stator 13.
- the stator 18 is one in the axial direction Rotor stage with rotor blades 14 connected downstream.
- the stator feet 17, 29, each Have stator segments with a plurality of stators 18 and 13, and the seal carrier ring 7 are each connected to housing sections 27, 10 which form a gas-tight seal from the environment.
- the housing sections 27, 10 are in turn on their outer circumference of a housing cladding 11 surrounded, in particular the guidance of cooling air serves.
- the rotor blades 14 each have sealing tips at their blade tips 15, with a labyrinth seal attached to the seal carrier ring 7 12 cooperate to avoid flow losses.
- On the A further stator 13 follows the rotor stage. 13 stator segments formed are on stator feet 17, 29 on the turbine housing attached. Between its housing sections 10 and Rotor blades 14 is the rotating one on the already mentioned seal carrier ring 7 Labyrinth seal 12 arranged, in which the sealing tips 15th of the rotor blades 14 when the rotor blades expand due to temperature and centrifugal forces can work into it.
- isolation space 21 is formed, in which first insulating elements 30 and second insulating elements 19 are arranged behind it.
- the housing sections 27 and 10 are via a housing screw 16 connected together. There is a circumferential one on the housing section 10 Hold nose 23 out, as shown in Figure 2 in detail.
- This revolving Retaining lug 23 is from above and below through one end of the seal carrier ring 7 and one end of a baffle explained in more detail later 1 includes so that they as a holder of the seal carrier ring 7 its end facing the stator 18 is used.
- On its stator 13 facing end is the seal carrier ring 7 in a groove-shaped in Recess 28 circumferential direction of the stator 29 is added.
- FIG. 1 shows an embodiment of a leakage current channel according to the invention 4 for channeling leakage flow, which is shown in detail in FIG is.
- the leakage flow channel 4 is in the circumferential direction of the turbine by an annular wall of the seal carrier ring 7 and an annular Baffle 1 limited, these two components by so-called.
- Spacer plates 2, which at regular intervals on the circumference are distributed, are spaced apart.
- the leakage current channel 4 thus has a rectangular flow cross section in the present exemplary embodiment on.
- connection gap 22 There is a connecting gap between the stator foot 17 and the seal carrier ring 7 22 formed.
- Side of the connecting gap 22 is an annular cavity 5 between Stator foot 17 and housing section 27 formed. Furthermore, the seal carrier ring 7 in the amount of the connecting gap 22 holes 3 through which the connection gap 22 is connected to the leakage current channels 4.
- the entire turbine housing is otherwise surrounded by a casing 11, via a screw connection 20 to the housing sections 10 connected is.
- this hot air leakage mixture 25 is on the outside of the seal carrier ring 7 in the leakage current channel 4, where it cool can and at the output of the leakage flow channel 4 entrained by further throttle air and following the wall of the seal carrier ring 7 into one Cavity 9 can emerge.
- the channel cross section of the leakage current channel 4 is designed so that whose flow resistance is much lower than that with insulation elements 19 is largely filled isolation space 21 around the ensure the desired flow pattern.
- the arrangement of the holes 3 is chosen so that the throttle air 8, which is of course colder is as the working gas in the main flow channel 6, also through the Bores 3 flows into the leakage current channels 4. Only if the amount of Throttle air 8 is less than the amount of leakage in those already mentioned Cavity 9 of the seal carrier ring 7 on that facing the recess 28 Exits at the end, so additional leakage air working gas 24 is emitted the main flow channel 6 through the connecting gap 22 and the holes 3 drawn into the leakage current channels 4. The leakage air working gas or the leakage air flow 24 penetrates due to the arrangement of the holes 3 not in the cavity 5. This will make the turbine housing or the housing sections 10, 27 are additionally protected against overheating.
- the leakage current channel 4 must not run over the entire length of the seal carrier ring 7. Rather, it is sufficient if the leakage current channel 4 is downstream of the first insulating element 30 or shortly after the start of the second insulating element 19 ends. This insulating element 19 then takes over the management of the leakage air mixture 25 essentially into the cavity 9. An unwanted one Flow around the insulating elements 30 and 19 and in particular the undesirable direct application of the housing section 10 with the Leakage air flow 24 can therefore no longer take place.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
Eine besonders vorteilhafte Ausführungsform der vorliegenden Erfindung wird mit den Merkmalen des Anspruchs 6 erreicht. Darin hat das Leitblech eine Doppelfunktion, da es hier nämlich gleichzeitig auch als Halterung des Dichtungsträgerrings an einer hervorstehenden umlaufenden Haltenase des Gehäusesegments dient. Durch diese Doppelfunktion läßt sich ein zusätzliches Halterungsbauteil einsparen. Schließlich weist eine weitere vorteilhafte Ausführungsform der vorliegenden Erfindung die Merkmale des Patentanspruchs 7 auf. Insbesondere in einer Niederdruckturbinenstufe einer Turbomaschine lassen sich deutliche Wirkungsgradsteigerungen durch eine entsprechende Ausgestaltung des Dichtungsträgerrings erzielen.
- Figur 1
- eine schematische Darstellung einer Niederdruckturbinenstufe einer Turbomaschine im Längsschnitt, bei der ein erfindungsgemäßer Leckstromkanal zur Kanalisierung von Leckströmung vorgesehen ist;
- Figur 2
- ein Detail des Längsschnitts aus Figur 1, bei dem der Leckstromkanal mit den entsprechenden Strömungen dargestellt ist;
- Figur 3
- eine schematische Darstellung einer Niederdruckturbinenstufe vom bekannten Stand der Technik, die bereits erläutert wurde.
- 1
- Leitblech
- 2
- Abstandsblech
- 3
- Bohrung
- 4
- Leckstromkanal
- 5
- Hohlraum
- 6
- Hauptströmungskanal
- 7
- Dichtungsträgerring
- 8
- Drosselluft
- 9
- Hohlraum
- 10
- Gehäuseabschnitt
- 11
- Verkleidung
- 12
- Labyrinthdichtung
- 13
- Stator
- 14
- Rotorschaufel
- 15
- Dichtungsspitzen
- 16
- Verschraubung
- 17
- Statorfuß
- 18
- Stator
- 19
- Isolierelement
- 20
- Verschraubung Gehäuse-Verkleidung
- 21
- Isolationsraum
- 22
- Verbindungsspalt
- 23
- Haltenase
- 24
- Leckluftströmung (des Arbeitsgases)
- 25
- Leckageluftgemisch
- 26
- Halteblech
- 27
- Gehäuseabschnitt
- 28
- Aussparung
- 29
- Statorfuß
- 30
- Isolierelement
Claims (7)
- Turbomaschine, bei der im Bereich einer Rotorstufe zwischen einem Dichtungsträgerring (7) und einem Gehäuseabschnitt (10) Isolierungen (19, 30) vorgesehen sind, dadurch gekennzeichnet, daß ein Leckstromkanal (4) zur Kanalisierung von Leckströmung im Bereich der Isolierungen (19, 30) vorgesehen ist.
- Turbomaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Leckstromkanal (4) zwischen einem Leitblech (1) und dem äußeren Umfang des Dichtungsträgerrings (7) gebildet ist.
- Turbomaschine nach Anspruch 2, dadurch gekennzeichnet, daß zwischen dem Leitblech (1) und dem äußeren Umfang des Dichtungsträgerrings (7) in regelmäßigem Abstand über den Umfang verteilte Abstandsbleche (2) vorgesehen sind.
- Turbomaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß über den Umfang des Dichtungsträgerrings (7) verteilte Öffnungen (3) angeordnet sind, über die Heißgas in den Leckstromkanal (4) einleitbar ist.
- Turbomaschine nach Anspruch 4, dadurch gekennzeichnet, daß die Öffnungen (3) an einem Verbindungsspalt (22) zwischen einem Hohlraum (5) und einem Hauptströmungskanal (6) angeordnet sind.
- Turbomaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Leitblech (1) gleichzeitig als Halteblech zur Befestigung des Dichtungsträgerrings (7) am Gehäuse (10) vorgesehen ist.
- Turbomaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Leckstromkanal (4) zur Verwendung in einer Niederdruckturbinenstufe vorgesehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19958809A DE19958809A1 (de) | 1999-12-07 | 1999-12-07 | Leckstromkanal |
DE19958809 | 1999-12-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1106785A1 EP1106785A1 (de) | 2001-06-13 |
EP1106785B1 true EP1106785B1 (de) | 2004-01-14 |
Family
ID=7931629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00120564A Expired - Lifetime EP1106785B1 (de) | 1999-12-07 | 2000-09-20 | Leckstromkanal im Rotor einer Turbomaschine |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1106785B1 (de) |
DE (2) | DE19958809A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2728122A1 (de) | 2012-10-30 | 2014-05-07 | MTU Aero Engines GmbH | Dichtungsträgerfixierung für eine Strömungsmaschine |
EP4276282A1 (de) * | 2022-05-13 | 2023-11-15 | RTX Corporation | Hitzeschild und verfahren zur installation davon |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10122464C1 (de) * | 2001-05-09 | 2002-03-07 | Mtu Aero Engines Gmbh | Mantelring |
FR2867224B1 (fr) * | 2004-03-04 | 2006-05-19 | Snecma Moteurs | Dispositif de maintien axial de secteur d'entretoise pour anneau d'une turbine haute-pression de turbomachine |
ES2620482T3 (es) | 2012-08-09 | 2017-06-28 | MTU Aero Engines AG | Impermeabilización del canal de flujo de una turbomáquina |
EP2696036A1 (de) * | 2012-08-09 | 2014-02-12 | MTU Aero Engines GmbH | Klemmring für eine Strömungsmaschine |
EP2719869A1 (de) * | 2012-10-12 | 2014-04-16 | MTU Aero Engines GmbH | Axiale Abdichtung in einer Gehäusestruktur für eine Strömungsmaschine |
EP2725203B1 (de) | 2012-10-23 | 2019-04-03 | MTU Aero Engines AG | Kühlluftführung in einer Gehäusestruktur einer Strömungsmaschine |
US9803491B2 (en) * | 2012-12-31 | 2017-10-31 | United Technologies Corporation | Blade outer air seal having shiplap structure |
US20180347399A1 (en) * | 2017-06-01 | 2018-12-06 | Pratt & Whitney Canada Corp. | Turbine shroud with integrated heat shield |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2257754B (en) * | 1983-02-26 | 1993-09-29 | Rolls Royce | Improvements in or relating to axial flow gas turbines |
US4573866A (en) * | 1983-05-02 | 1986-03-04 | United Technologies Corporation | Sealed shroud for rotating body |
DE3428892A1 (de) * | 1984-08-04 | 1986-02-13 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | Schaufel- und dichtspaltoptimierungseinrichtung fuer verdichter von gasturbinentriebwerken, insbesondere gasturbinenstrahltriebwerken |
US5238365A (en) * | 1991-07-09 | 1993-08-24 | General Electric Company | Assembly for thermal shielding of low pressure turbine |
DE4331060C1 (de) * | 1993-09-13 | 1994-06-30 | Gruenzweig & Hartmann Montage | Wärmedämmanordnung |
-
1999
- 1999-12-07 DE DE19958809A patent/DE19958809A1/de not_active Withdrawn
-
2000
- 2000-09-20 DE DE50005016T patent/DE50005016D1/de not_active Expired - Lifetime
- 2000-09-20 EP EP00120564A patent/EP1106785B1/de not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2728122A1 (de) | 2012-10-30 | 2014-05-07 | MTU Aero Engines GmbH | Dichtungsträgerfixierung für eine Strömungsmaschine |
EP4276282A1 (de) * | 2022-05-13 | 2023-11-15 | RTX Corporation | Hitzeschild und verfahren zur installation davon |
Also Published As
Publication number | Publication date |
---|---|
DE19958809A1 (de) | 2001-06-13 |
DE50005016D1 (de) | 2004-02-19 |
EP1106785A1 (de) | 2001-06-13 |
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