Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/26—Rotors specially for elastic fluids
  • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
  • F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
  • F04D29/322—Blade mountings
• • 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
  • 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
  • F01D5/32—Locking, e.g. by final locking blades or keys
  • F01D5/326—Locking of axial insertion type blades by other means

Definitions

• the invention relates to a turbine blade securing device for a turbomachine.
• Blade fasteners of the above type are usually used for mounting blades on a rotor of a turbomachine, such as a steam turbine, which rotate at high speed when the rotor rotates ⁇ speed. Due to the fast rotation of the rotor, the associated blades are subjected to high centrifugal force. The blade root of the blades is therefore exposed to high forces and is strongly forced radially outward in a groove on the blade holder. In addition, the blades are exposed to strong vibration loads, so that it can come to the groove to mechanical damage, material fatigue, corrosion and a wandering movement of the blade root within the groove.
• a turbine blade securing comprising a wedge movable in an axial direction, wherein a traction means cooperates with the wedge such that the wedge is movable in the axial direction by the traction means, wherein the wedge is formed such that the movement of the wedge in axial direction leads to a force on a turbine blade to be secured in the radial direction.
• the invention proceeds from the idea that the secured turbine blade, which is held in a blade holder secured by a radially acting force ⁇ the must.
• the traction device takes on the task of moving the wedge in the axial direction. By the movement of the wedge creates a radial force acting on the turbine blade in a radial direction. By a minimal movement of the turbine blade in the radial direction of the blade root is pressed into the blade holder. The turbine blade is thereby secured in such a way that a tilting movement is almost avoided.
• the wedge is inserted ⁇ at a corresponding rotor-surface abutment surface.
• the wedge is proposed in this advantageous ⁇ further development to apply the wedge on a corresponding oblique wedge surface in the blade holder. This has the advantage that the blade root does not have to be processed. In addition, this has a favorable effect on the power flow in the foot.
• a milled part which has the rotor surface contact surface. This has the advantage that the blade holder only needs to be executed with a groove and that a milled ⁇ can be placed in the groove.
• the milled part can be prefabricated in large quantities. The blade holder can thereby be easily manufactured, since only one groove is needed.
• the traction means has a thread which engages in a complementary countercurrent ⁇ winch in the wedge.
• the traction means is further developed by simple means such that it can be produced easily.
• the wedge moves by turning the traction mechanism.
• the transmittable force on the turbine blade root is under Kunststoff ⁇ Lich.
• a securing segment is provided, which is designed such that an unintentional release of the traction means is prevented by the wedge. This makes it possible to platzie ⁇ ren, with a release by the securing segment ruled to be the wedge safely and securely.
• the securing segment is performed as a sheet of ⁇ and carried out the fuse of the traction means by bending over or flanging of the plate on the traction means. This makes it very easy the traction means, the course one
• Screw head or the like with the Sich ceremoniessseg ⁇ ment secure.
• a simple bending of the sheet is sufficient to secure the traction means.
• a securing means for exerting a spring force in the radial direction is provided. The locking device compensates for a groove widening for small speed ranges.
• the securing means is designed as a plate ⁇ spring.
• FIG. 1 is a perspective view of the turbine blade guard in the installed state
• FIG. 2 shows a sectional view through the turbine blade fuse
• Figure 3 is an enlarged view of a Sectionaus ⁇ -section of Figure 2
• Figure 4 is a perspective view of the
• FIG. 5 shows a perspective view of an alternative embodiment of the turbine windshield fuse without installed turbine blade
• Figure 6 is a cross-sectional view of an alternative
• FIG. 7 shows an enlarged view of a detail from FIG. 6,
• FIG. 1 shows a perspective view of a turbine blade safety device 1.
• a turbine blade 2 comprises a blade root 3.
• the blade root 3 is designed in a known manner as a fir tree root.
• the blade root 3 is arranged in a blade holder 4.
• the blade holder 4 accordingly has a blade root 3 complementarily formed ⁇ fir tree shape.
• the turbine blade 2 must be secured ⁇ well in the axial direction 5 and 6 in the radial direction.
• the blade holder 4 may be, for example, a rotor.
• FIG. 2 shows a turbine blade securing device 1 in a sectional view.
• the turbine blade safety device 1 comprises a wedge 7 which can be moved in the axial direction 5, wherein a traction means 8 interacts with the wedge 7 such that the wedge 7 can be moved in the axial direction 5 by the traction means 8.
• the wedge 7 abuts against a turbine blade root abutment surface 9.
• the movement of the wedge 7 against the turbine blade root abutment surface 9 creates a force in the radial direction 6.
• the traction means 8 comprises a thread 10.
• the wedge 7 has the ⁇ accordingly a bore 11 with a corresponding counter-thread 12.
• a turning of the traction means 8 causes a Be ⁇ movement of the wedge 7 in the axial direction 5.
• the traction means 8 in this case has a conventional screw head 13.
• the screw head 13 may be formed as a hexagon 14 and moved with a standard open-end wrench. It can be set here a predetermined torque.
• the turbine blade guard 1 is formed with a securing segment 15.
• the securing segment 15 prevents unintentional release of the pulling means 8 from the wedge 7.
• the securing segment 15 is designed as a sheet.
• the securing of the traction means 8 takes place by bending over or flanging the sheet around the traction means 8. Of course, be bent 13 of course, thereby avoiding rotation of the traction device 8.
• the turbine blade safety device 1 also has a securing means 16, which is designed to exert a spring force in the radial direction 6.
• the securing means 16 is formed as a plate spring for ⁇ and rungsnut in a Siche arranged 17th
• the wedge 7 is elongated and arranged in a matching groove 18.
• FIG. 5 shows an alternative embodiment of the turbine blade safety device 1.
• the turbine blade 2 has been omitted, so that only the blade holder 4 can be seen.
• the blade holder 4 is in this case formed with a corresponding groove 19.
• a milled part 20 is arranged in the groove 19.
• the milled part 20 has a rotor surface contact surface 21.
• the Rotoroberflä ⁇ chen-contact surface 21 is to transmit the same function as the turbine blade root abutment face 9, namely a force of the wedge 7 in the radial direction 6 substantially.
• the securing means 16 is in this case arranged between the wedge 7 and the turbine blade 2.
• the securing means 16 assumes the same tasks as described for FIGS. 2 and 3.
• FIG. 6 shows a sectional illustration through the turbine blade safety device 1.
• inventive arrangement of Switzerlandmit ⁇ tel and wedge at the ends 21, 22 is arranged.
• figure 7 is an enlarged view of the turbine blade fuse 1 of Figure 6 can be seen.
• FIG. 8 is a perspective view of the blade holder 4 can be seen, wherein the traction means 8 and the
• FIG. 8 impressively shows that the milled part 20 is easy to manufacture and can be easily mounted in the blade holder 4.
• the milled part 20 may be circular at its ends. This has the advantage that it can be minimized notch stresses.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Connection Of Plates (AREA)
• Installation Of Indoor Wiring (AREA)

Priority Applications (6)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37685152

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (31)

Citations (8)

Family Cites Families (15)

• 2006
  • 2006-08-25 EP EP06017818A patent/EP1892380A1/de not_active Withdrawn
• 2007
  • 2007-08-02 WO PCT/EP2007/058001 patent/WO2008022890A1/de not_active Ceased
  • 2007-08-02 EP EP07802464A patent/EP2076656B1/de not_active Not-in-force
  • 2007-08-02 DE DE502007003039T patent/DE502007003039D1/de active Active
  • 2007-08-02 US US12/310,412 patent/US8192167B2/en not_active Expired - Fee Related
  • 2007-08-02 AT AT07802464T patent/ATE459786T1/de active
  • 2007-08-02 JP JP2009524997A patent/JP2010501765A/ja active Pending
  • 2007-08-02 CN CN2007800316835A patent/CN101506475B/zh not_active Expired - Fee Related

Patent Citations (8)

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