SECURING SEGMENT FOR THE VIBRATION DAMPING OF TURBINE BLADES AND ROTOR DEVICE

• US 20140314578A1
• Filed: 09/12/2012
• Published: 10/23/2014
• Est. Priority Date: 09/12/2011
• Status: Abandoned Application

• Current Assignee: Rolls-Royce Deutschland Limited & Company KG (Rolls-Royce Holdings Plc)
• Original Assignee: Rolls-Royce Deutschland Limited & Company KG (Rolls-Royce Holdings Plc)
• Inventors: Xu, Jianmin
• Application Number:
  US14/343,460
• Publication Number:
  US 20140314578A1
• Time in Patent Office: Days
• US Class Current: 416/220.R
• CPC Class Codes: F01D 5/10 Anti- vibration means specially adapted for radial flow machines or engines F01D5/04
• CPC Class Codes: F01D 5/3015 with side plates
• CPC Class Codes: F01D 5/323 Locking of axial insertion type blades by means of a key or the like parallel to the axis of the rotor
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A retaining segment for axially securing at least one rotor blade on a disk wheel of a rotor device of a jet engine is operatively connectable to at least one rotor blade and to a disk wheel. In a first peripheral area of the retaining segment that is laterally disposed in the circumferential direction in the installed state, a projecting region is provided, and in a second lateral peripheral area facing away from the first peripheral area, a receiving region is provided. The projecting region at least partially overlaps a receiving region of a retaining segment that is identical in design and arranged adjacently in the circumferential direction, and for performing frictional work with the receiving region. A rotor device has rotor blades arranged via blade roots substantially in the axial direction inside recesses of a disk wheel and secured by several such retaining segments.

Claims

1. A retaining segment for axially securing at least one rotor blade on a disk wheel of a rotor device of a jet engine that is operatively connectable to at least one rotor blade and to a disk wheel, wherein a first peripheral area of the retaining segment that is laterally disposed in the circumferential direction in the installed state, a projecting region is provided, and that in a second lateral peripheral area facing away from the first peripheral area, a receiving region is provided, with the projecting region of the retaining segment in the installed state being designed for at least partially overlapping a receiving region of a retaining segment that is identical in design and arranged adjacently in the circumferential direction, and for performing frictional work with said receiving region.

2. The retaining segment in accordance with claim 1, wherein both the projecting region and the receiving region of the retaining segment each have at least one contact surface which, in the installed state of the retaining segment, is designed for interacting with a contact surface of a projecting region or a receiving region of a retaining segment arranged adjacently in the circumferential direction, where a normal of the contact surface of the receiving region and a normal of the contact surface of the projecting region are directed in substantially opposite directions.

3. The retaining segment in accordance with claim 2, wherein the normals of the contact surface of the receiving region and of the contact surface of the projecting region in the installed state point substantially in the axial direction.

4. The retaining segment in accordance with claim 2, wherein the contact surfaces of the projecting region and/or of the receiving region extend in the radial direction over an overall width of the retaining segment.

5. The retaining segment in accordance with claim 1, wherein both the projecting region and the receiving region are designed as a step with a material thickness reduced in the axial direction in the installed state compared to an area in the middle of the retaining segment in the circumferential direction.

6. The retaining segment in accordance with claim 5, wherein a material thickness of the projecting region and of the receiving region in the axial direction is at least approximately half of a material thickness of the retaining segment in an area which is in the middle in the circumferential direction.

7. The retaining segment in accordance with claim 5, wherein an end face of the step of the receiving region forms a stop and the step of the projecting region has a shoulder, with the end face of the step of the receiving region in the installed state of the retaining segment being designed for interacting with a shoulder of a retaining segment arranged adjacently in the circumferential direction.

8. The retaining segment in accordance with claim 1, wherein both the projecting region and the receiving region have a material thickness which is at least approximately comparable to a material thickness of an area of the retaining segment which is in the middle in the circumferential direction.

9. The retaining segment in accordance with claim 8, wherein two retaining segments adjacently arranged in the installed state are each designed curved in the axial direction in an area adjoining the overlapping region.

10. The retaining segment in accordance with claim 1, wherein a contour facing outwards in the radial direction in the installed state of the retaining segment has at least one contact area for making contact with at least one rotor blade, said contact area extending in the circumferential direction substantially only over part of the length of the retaining segment.

11. The retaining segment in accordance with claim 10, wherein the retaining segment contour facing at least one rotor blade in the installed state of the retaining segment has at least two contact areas which interact in particular with different rotor blades in the installed state of the retaining segment.

12. A rotor device for a jet engine with a disk wheel and several rotor blades connected to said disk wheel, with the rotor blades being arranged in each case via a blade root substantially in the axial direction inside recesses of the disk wheel, with several retaining segments according to claim 1 being provided for axially securing the rotor blades in the recesses of the disk wheel, said retaining segments interacting on the one hand with grooves of the rotor blades and on the other hand with at least one groove of the disk wheel, and with at least one projecting region of a retaining segment overlapping a receiving region of a retaining segment adjacently arranged in the circumferential direction in order to perform frictional work during operation of the rotor device.

13. The rotor device in accordance with claim 12, wherein retaining segments are provided in the axial direction on both sides of the rotor blades.

14. The rotor device in accordance with claim 12 wherein a damping device is provided in an area between platforms of adjacent rotor blades on a side of the platforms facing in the direction of a rotary axis of the rotor device.