CA1206886A - Blade platform with seal land - Google Patents
Blade platform with seal landInfo
- Publication number
- CA1206886A CA1206886A CA000440226A CA440226A CA1206886A CA 1206886 A CA1206886 A CA 1206886A CA 000440226 A CA000440226 A CA 000440226A CA 440226 A CA440226 A CA 440226A CA 1206886 A CA1206886 A CA 1206886A
- Authority
- CA
- Canada
- Prior art keywords
- discs
- blades
- lands
- rotatable
- blade
- 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
Links
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
-
- 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
- F01D11/001—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between stator blade and rotor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A turbine having an annular array of rotatable blades which are fastened in side entry grooves disposed in discs integral with a shaft, the rotatable blades having lands which extend axially from platforms on the blade and the lands of adjacent blades cooperate to form a cylindrical surface utilized with a labyrinth seal, the blades being removable to provide access for machining a large cavity formed between adjacent discs.
A turbine having an annular array of rotatable blades which are fastened in side entry grooves disposed in discs integral with a shaft, the rotatable blades having lands which extend axially from platforms on the blade and the lands of adjacent blades cooperate to form a cylindrical surface utilized with a labyrinth seal, the blades being removable to provide access for machining a large cavity formed between adjacent discs.
Description
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BLADE PLATFORM WITH SEAL LAND
BACKGROUND OF THE INVENTION
This invention relates to steam turbines and more particularly to blades and rotor discs for low pros-sure turbines.
In order to increase the opening or gap between rotor discs to provide sufficient opening to permit machine in of cavities disposed between the discs, seal lands are relocated on the blade platforms which are removable with the blades and thereby provide access to the cavities lo between the discs.
SUMMARY OF TEE INVENTION
In general, a rotatable blade for a steam turbine having an annular array of rotatable blades which are fastened to discs integral with a shaft when made in accordance with this invention to provide sufficiently large spacing between the discs for allowing for machining of the discs comprise a root portion, which interlocks with the discs, an air toil portion, a platform portion disposed between the root and the air foil portion and a land extending from the platform portion so that when the blades are disposed in annular array the lands abut, forming a generally continuous ring which extends axially beyond the air foil portions and encloses a substantial portion of the spacing-between the discs.
I, .
sly BRIEF DESCRIPTION OF THE DRAWINGS
The objects and advantages of this invention will become more apparent from reading the following detailed description in conjunction with the accompanying drawings, in which:
- Figure 1 is a partial-sectional view of a turbine rotor showing the prior art;
Fig. 2 is a partial prospective view of an array of rotating blades made in accordance with this invention;
I and Fig. 3 is a partial-sectional view of a turbine disc and rotatable blades made in accordance with this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in detail and in particular to Figure 2, there is shown a prospective view of a partial annular array of rotating or rotatable blades l. The blades 1 have a Christmas tree-shaped root portion 3, which fits or interlocks with a side entry groove 5 of essentially the same shape disposed generally axially in a disc 7 made integral with a shaft 9. The radially outer portion of the rotatable blade 3 forms in airfoil shaped portions 11, which are spaced apart to allow steam flow there through. Platforms 13 are disposed between the root and airfoil portions 3 and 11, respectively, and each platform 13 has a Land 15 made integral therewith and ox-tending axially therefrom. The lands 15 have an arcuate surface 17 which cooperates with adjacent lands 15 to form a generally cylindrical surface. Disposed adjacent the lands 15 is a stationary blade ring or diaphragm 19, which has a plurality of labyrinth seals 21 which cooperate with the lands 15 to form a rotating seal between the stages.
A comparison with the prior art shown in Figure 1 shows that the gap between adjacent discs is relatively small generally precluding machining of the cavity between adjacent disc, however, with the lands 15 made integral with the side entry blades 1, once the blades are removed, the gap between adjacent discs is enlarged substantially, greatly increasing the accessibility of the cavity to machining operations without increasing steam leakage around stationary blazing or reducing the clearance for actual axial expansion or increasing the tolerances for radial expansion of the rotating seal.
BLADE PLATFORM WITH SEAL LAND
BACKGROUND OF THE INVENTION
This invention relates to steam turbines and more particularly to blades and rotor discs for low pros-sure turbines.
In order to increase the opening or gap between rotor discs to provide sufficient opening to permit machine in of cavities disposed between the discs, seal lands are relocated on the blade platforms which are removable with the blades and thereby provide access to the cavities lo between the discs.
SUMMARY OF TEE INVENTION
In general, a rotatable blade for a steam turbine having an annular array of rotatable blades which are fastened to discs integral with a shaft when made in accordance with this invention to provide sufficiently large spacing between the discs for allowing for machining of the discs comprise a root portion, which interlocks with the discs, an air toil portion, a platform portion disposed between the root and the air foil portion and a land extending from the platform portion so that when the blades are disposed in annular array the lands abut, forming a generally continuous ring which extends axially beyond the air foil portions and encloses a substantial portion of the spacing-between the discs.
I, .
sly BRIEF DESCRIPTION OF THE DRAWINGS
The objects and advantages of this invention will become more apparent from reading the following detailed description in conjunction with the accompanying drawings, in which:
- Figure 1 is a partial-sectional view of a turbine rotor showing the prior art;
Fig. 2 is a partial prospective view of an array of rotating blades made in accordance with this invention;
I and Fig. 3 is a partial-sectional view of a turbine disc and rotatable blades made in accordance with this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings in detail and in particular to Figure 2, there is shown a prospective view of a partial annular array of rotating or rotatable blades l. The blades 1 have a Christmas tree-shaped root portion 3, which fits or interlocks with a side entry groove 5 of essentially the same shape disposed generally axially in a disc 7 made integral with a shaft 9. The radially outer portion of the rotatable blade 3 forms in airfoil shaped portions 11, which are spaced apart to allow steam flow there through. Platforms 13 are disposed between the root and airfoil portions 3 and 11, respectively, and each platform 13 has a Land 15 made integral therewith and ox-tending axially therefrom. The lands 15 have an arcuate surface 17 which cooperates with adjacent lands 15 to form a generally cylindrical surface. Disposed adjacent the lands 15 is a stationary blade ring or diaphragm 19, which has a plurality of labyrinth seals 21 which cooperate with the lands 15 to form a rotating seal between the stages.
A comparison with the prior art shown in Figure 1 shows that the gap between adjacent discs is relatively small generally precluding machining of the cavity between adjacent disc, however, with the lands 15 made integral with the side entry blades 1, once the blades are removed, the gap between adjacent discs is enlarged substantially, greatly increasing the accessibility of the cavity to machining operations without increasing steam leakage around stationary blazing or reducing the clearance for actual axial expansion or increasing the tolerances for radial expansion of the rotating seal.
Claims
1. A rotatable blade for a steam turbine having an annular array of rotatable blades which are fastened to discs made as an integral portion of a shaft, there being a sufficiently large spacing between said discs to allow for machining between said discs, said rotatable blades comprising:
a christmas-tree shaped root portion which interlocks with said discs;
an airfoil portion;
a platform portion disposed between said root and airfoil portions; and a land made integral with and extending from said platform portion of each blade so that when said blades are disposed in an annular array the lands abut, the lands having an outer radial surface forming a generally continuous ring with an outer generally cylindrical surface which extends axially beyond the airfoil portion and encloses a substantial portion of the spacing between said discs, said generally cylindrical surface formed by the lands cooperates with a labyrinth to form a rotating seal between axially adjacent rotating blades.
a christmas-tree shaped root portion which interlocks with said discs;
an airfoil portion;
a platform portion disposed between said root and airfoil portions; and a land made integral with and extending from said platform portion of each blade so that when said blades are disposed in an annular array the lands abut, the lands having an outer radial surface forming a generally continuous ring with an outer generally cylindrical surface which extends axially beyond the airfoil portion and encloses a substantial portion of the spacing between said discs, said generally cylindrical surface formed by the lands cooperates with a labyrinth to form a rotating seal between axially adjacent rotating blades.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US44247882A | 1982-11-17 | 1982-11-17 | |
| US442,478 | 1982-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1206886A true CA1206886A (en) | 1986-07-02 |
Family
ID=23756939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000440226A Expired CA1206886A (en) | 1982-11-17 | 1983-11-02 | Blade platform with seal land |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5996401A (en) |
| CA (1) | CA1206886A (en) |
| IT (1) | IT1218035B (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH626947A5 (en) * | 1978-03-02 | 1981-12-15 | Bbc Brown Boveri & Cie |
-
1983
- 1983-10-20 IT IT23368/83A patent/IT1218035B/en active
- 1983-10-31 JP JP58202934A patent/JPS5996401A/en active Granted
- 1983-11-02 CA CA000440226A patent/CA1206886A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0368201B2 (en) | 1991-10-25 |
| IT1218035B (en) | 1990-03-30 |
| JPS5996401A (en) | 1984-06-02 |
| IT8323368A0 (en) | 1983-10-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |