GB2226604A - Blade-base attachment for a fibre rotor blade - Google Patents
Blade-base attachment for a fibre rotor blade Download PDFInfo
- Publication number
- GB2226604A GB2226604A GB8926656A GB8926656A GB2226604A GB 2226604 A GB2226604 A GB 2226604A GB 8926656 A GB8926656 A GB 8926656A GB 8926656 A GB8926656 A GB 8926656A GB 2226604 A GB2226604 A GB 2226604A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blade
- base
- base plate
- rotor
- drum
- 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
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
- F01D5/3092—Protective layers between blade root and rotor disc surfaces, e.g. anti-friction layers
-
- 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
-
- 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
- F01D5/3023—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses
- F01D5/3046—Fixing blades to rotors; Blade roots ; Blade spacers of radial insertion type, e.g. in individual recesses the rotor having ribs around the circumference
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Description
GL on- _ZL_ ko ko (3 L- "Blade-base attachment for a fibre rotor blade"
The present invention relates to a blade-base attachment for a fibre rotor blade. in particular a propeller fan blade. comprising a drum mounted in a rotor and- being rotatable about a radial axis of the rotor and being attached to a blade-base plate connected to the blade.
Various blade-base attachments are known. by means of which fan blades and propeller fan blades are held pivotably on the rotor. This makes it possible for the blades to be adapted to different load conditions. as a result of which an improved degree of efficiency can be achieved during operation outside the design point. In addition. it is possible to set the blades to reverse thrust. i.e. after an aeroplane has landed they can act as brakes and thus render complicated thrust-reversing flaps unnecessary. Attachments of this type are known for example from US 3 900 274 and DE-OS 24 03 016. These designs, however. have either metal blades or a metal core which is formed in the base region for attachment and which is covered in the area of the blade with fibre-reinforced plastics material. These designs. however, have grave disadvantages: they are susceptible to vibration and vibration fatigue. are heavy and in addition have adhesive connections between the metal and the fibre material which are liable to fail.
An object of the invention is to provide a blade-base attachment for a fibre blade. in particular for a blade of full-fibre-reinforced plastics material. by which a rigid and simple replaceable base structure ispossible, which at the same time allows the blades to pivot.
The invention provides a blade-base attachment for a fibre rotor blade as claimed in Claim 1.
The most important advantage of the present invention is that an extremely compact attachment, which is advantageous in terms of fibre construction and which in addition can be rapidly dismantled, is possible. In addition, a substantially lower weight can be achieved compared with rotor blades constructed in a conventional manner. In contrast to the known fibre structures with a metal core, the attachment according to the invention provides a better transfer of the centrifugal and bending forces acting upon the blades into the drum and thus into the rotor. The attachment according to the invention makes it possible to use a dovetailed connection. which is advantageous in terms of load, even when large rotor blades are used. A dovetailed connection was previously restricted to rigid metal blades. In this way. by virtue of the invention, such a connection is also made possible for the first time for those components whose core is made of fibre. i.e. is not made of metal.
Preferably. the blade comprises a shaft of substantially rectangular cross-section enlarged adjacent the holding groove and being engaged by a raised wall of the blade-base plate. On account of the enlargement of the shaft in its lower region. a positive locking connection of the blade to the blade-base plate is possible. which is preferably additionally reinforced by an adhesive connection between the shaft and the wall of the bladebase plate.
Preferably. the blade-base plate is screwed to the drum. Thus. wedge forces of the dovetailed connection are absorbed and the dovetailed connection is prevented from being overloaded by an advantageous distribution of forces. In addition. a pre-stress, which increases rigidity. is imparted to the connection in this way.
For reasons of better manufacture and assembly the bladebase plate is preferably constructed from two half shells, which may, for example. be welded together.
Preferably. the dovetailed holding rail is constructed 1 with a corrugated profile. This feature. known from the field of turbine blades._advantageously permits a distribution of the forces arising during operation over a plurality of support surfaces, as a result of which the number and size of the force-transmitting surfaces can be increased. Thus. it becomes less critical if one of the components breaks. In this connection._three corrugations are preferably provided.
Preferably. a double intermediate foil layer is provided between the guide flanges and the dovetailed holding flange. as a result of which friction corrosion on the contact surfaces in the event of vibration can be avoided.
Preferably. the wall of the blade-base plate is positively locked to the shaft by means of transverse bolts. As a result. part of the centrifugal forces arising during operation are transmitted from the blad to the wall of the blade-base plate. thus relieving th contact surface between the shaft and the blade-base plate.
e e Embodiments of the invention will now be described with reference to the accompanying drawings, in which Fig. 1 is a longitudinal section through a blade-base i a attachment. and 1 Fig. 2 is a longitudinal section through an alternative blade-base attachment.
In Fig. 1 a blade-base attachment 1 is used to attach a fibre blade 2 rotatably to a metal rotor 3. For this purpose the base region of the blade 2 is shaped to form a shaft 4 surrounded by a wall 5 of a bladebase plate 6. A number of bolts 7 are driven transversely through the shaft 4 and are supported in the wall 5.
The blade-base plate 6 is connected in two ways to a drum 8. namely by means of a dovetail-like connection 9, and by means of a plurality of screws 10 distributed around the periphery of the blade-base plate 6.
Part of the connection 9 on the drum 8 comprises a dovetailed holding rail 12 extending at right angles to and through the axis of rotation 11 of the drum. This dovetailed holding rail 12 is engaged by two guide flanges 13a and 13b of the blade-base plate The guide flanges 13a, 13b each have two guide surfaces 14a,b and 15a.b. thereby ensuring an exact fixing and guidance of the blade-base plate 6 with respect to the drum 8. The sides of the guide flanges 13a and 13b remote from the holding rail 12 are provided with support shoulders 16a and b. which are supportively engaged with suitably shaped collars 17a and 17b of drum 8. This ensures that during operation there is no outward spreading of the guide flanges 13a,b as a result of centrifugal forces.
The drum 8 is supported by way of a bearing and sealing device 18 (not shown in detail) in the rotor 3, the drum 8 being rotatable or pivotable by a certain angle relative to the rotor 3 about the axis of rotation 11 of the drum. Pivoting is caused by means of a pivoting device (not shown) introduced through the bore 19 of the rotor 3 to engage the flange 20 of the drum 8.
The shaft 4 is enlarged in the region of its lower end 21, so as to ensure that under all operating conditions the shaft 4 will not slip out of the wall 5 even in the event of failure or absence of the bolts 7.
The guide flanges 15a,b are provided with an intermediate foil layer 22. which is preferably constructed as a double layer. In the same way the guide surfaces 14a.b can also be provided with a similar intermediate foil layer 22.
The alternative embodiment shown t 1 in Fig. 2 differs from 1 1 that shown in Fig. 1 in that the dovetailed holding rail 12a comprises a plurality of steps or corrugations arranged one above the other. The blade-base plate 6a is correspondingly shaped with a plurality of guide flanges 23 to engage the steps or corrugations of the holding rail 12a.
Claims (11)
1 1. A blade-base attachment for a fibre rotor blade. comprising a drum mounted in a rotor and being rotatable about a radial axis of the rotor and being attached to a blade-base plate connected to the blade, wherein an end face of the drum is provided with a dovetailed-holding rail extending in an axial plane of the drum and being engaged by two guide flanges of the blade-base plate defining a holding groove. the sides of the guide flanges remote from the holding rail being provided with support shoulders in supporting engagement with collars of the drum.
2. A blade-base attachment as claimed in Claim 1. wherein the blade comprises a shaft of substantially rectangular cross-section enlarged adjacent the holding groove and being engaged by a raised wall of'the blade-base plate.
3. A blade-base fastening according to Claim 2, wherein the fibre shaft is glued to the wall of the blade-base plate.
4. A blade-base attachment as claimed in any one of Claims 1 to 3. wherein the blade-base plate is screwed to the drum.
1 i
5. A blade-base attachment as claimed in any one of the preceding Claims. wherein the blade-base plate is constructed from two half shells.
6. A blade-base attachment as claimed in Claim 5, wherein the two half shells are welded together.
7. A blade-base attachment as claimed in any one of the preceding Claims. wherein the dovetailed holding rail is constructed with a corrugated profile.
8. A blade-base attachment as claimed in any one of the preceding Claims. wherein a double intermediate foil layer is provided between the guide flanges and the dovetailed holding rail.
9. A blade-base attachment as claimed in any one of preceding Claims. wherein the wall of the blade-base plate is positively locked to the shaft by means of transverse bolts.
10. A blade-base attachment for a fibre rotor blade substantially as herein described with reference to Fig. 1 or 2 of the accompanying drawings.
11. A propellor comprising a rotor, a plurality of fibre rotor blades and a plurality of blade-base attachments as claimed in any one of the preceding claims.
1 i Published 1990atThePatent Office. State House. 66 71 High Holborn. LcndonWCIR4TP. Further copies maybe obtained from. The Patent Office Sales Branch, St Mary Cray. Orpington. Kent BR5 3Rr Printed by Multiplex techniques ltd. St Marv Cray. Kent. Cor. 1 87
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19883839672 DE3839672A1 (en) | 1988-11-24 | 1988-11-24 | SHOVEL FOOT FASTENING FOR A FIBER TECHNICAL ROTOR SHOVEL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8926656D0 GB8926656D0 (en) | 1990-01-17 |
| GB2226604A true GB2226604A (en) | 1990-07-04 |
| GB2226604B GB2226604B (en) | 1992-10-21 |
Family
ID=6367806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8926656A Expired - Lifetime GB2226604B (en) | 1988-11-24 | 1989-11-24 | The combination of a blade-base attachment and a rotor blade. |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3839672A1 (en) |
| FR (1) | FR2639398B1 (en) |
| GB (1) | GB2226604B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3069989A1 (en) * | 2015-03-20 | 2016-09-21 | Hamilton Sundstrand Corporation | Lightweight propeller blade with improved retention capacity |
| RU2651697C2 (en) * | 2013-02-04 | 2018-04-23 | Сафран Аэро Бустерс Са | Rotor drum of axial turbomachine and corresponding turbomachine |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10113609C1 (en) * | 2001-03-20 | 2002-03-21 | Voith Siemens Hydro Power | Turbine rotor for wind turbine has intermediate plate between each rotor blade and outer ring of rotor hub |
| NO339655B1 (en) * | 2015-05-28 | 2017-01-16 | Dynavec As | Runner for a fluid machine having removable blades |
| WO2023234946A1 (en) * | 2022-06-03 | 2023-12-07 | General Electric Company | Stator vane assembly with an attachment assembly |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB637238A (en) * | 1947-01-20 | 1950-05-17 | Rotol Ltd | Improvements in or relating to variable-pitch propellers |
| GB825303A (en) * | 1957-04-15 | 1959-12-16 | Rotol Ltd | Improvements in or relating to variable pitch propellers |
| US4019832A (en) * | 1976-02-27 | 1977-04-26 | General Electric Company | Platform for a turbomachinery blade |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3902822A (en) * | 1973-02-21 | 1975-09-02 | United Aircraft Corp | Modular gearbox for a variable pitch fan propulsor |
| US3900274A (en) * | 1974-06-25 | 1975-08-19 | Gen Electric | Remote controlled actuation system for the rotor of a gas turbine engine |
| DE2658876C3 (en) * | 1976-12-24 | 1983-11-10 | Hütter, Ulrich, Prof. Dr.-Ing., 7312 Kirchheim | Shell bodies, for example hydrofoils or rotor blades, in composite construction |
| DE3133158C1 (en) * | 1981-08-21 | 1982-12-16 | MTU Motoren- und Turbinen-Union München GmbH, 8000 München | Metal press liner and process for making the same |
| US4810167A (en) * | 1986-12-08 | 1989-03-07 | Hartzell Propeller Inc. | Composite aircraft propeller blade |
| DE3710321C1 (en) * | 1987-03-28 | 1988-06-01 | Mtu Muenchen Gmbh | Fan blade, especially for prop fan engines |
-
1988
- 1988-11-24 DE DE19883839672 patent/DE3839672A1/en active Granted
-
1989
- 1989-11-24 GB GB8926656A patent/GB2226604B/en not_active Expired - Lifetime
- 1989-11-24 FR FR8915488A patent/FR2639398B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB637238A (en) * | 1947-01-20 | 1950-05-17 | Rotol Ltd | Improvements in or relating to variable-pitch propellers |
| GB825303A (en) * | 1957-04-15 | 1959-12-16 | Rotol Ltd | Improvements in or relating to variable pitch propellers |
| US4019832A (en) * | 1976-02-27 | 1977-04-26 | General Electric Company | Platform for a turbomachinery blade |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2651697C2 (en) * | 2013-02-04 | 2018-04-23 | Сафран Аэро Бустерс Са | Rotor drum of axial turbomachine and corresponding turbomachine |
| EP3069989A1 (en) * | 2015-03-20 | 2016-09-21 | Hamilton Sundstrand Corporation | Lightweight propeller blade with improved retention capacity |
| US9849969B2 (en) | 2015-03-20 | 2017-12-26 | Hamilton Sunstrand Corporation | Lightweight propeller blade with improved retention capacity |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8926656D0 (en) | 1990-01-17 |
| DE3839672C2 (en) | 1992-08-27 |
| GB2226604B (en) | 1992-10-21 |
| DE3839672A1 (en) | 1990-05-31 |
| FR2639398B1 (en) | 1994-07-29 |
| FR2639398A1 (en) | 1990-05-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19981124 |