ROTOR WITH A LOCKING PLATE FOR SECURING AN ANTIROTATION LOCK AGAINST UNSCREWING

• US 20180023394A1
• Filed: 01/07/2016
• Published: 01/25/2018
• Est. Priority Date: 03/04/2015
• Status: Active Grant

• Current Assignee: Siemens Energy Global GmbH & Co. KG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Kampka, Kevin, Kolk, Karsten, Schrder, Peter, Veitsman, Vyacheslav
• Granted Patent: US 10,641,096 B2
• Time in Patent Office: Days
• CPC Class Codes: F01D 5/066 Connecting means for joining rotor-discs or rotor-elements together, e.g. by a central bolt, by clamps
• CPC Class Codes: F01D 5/082 on the side of the rotor disc
• CPC Class Codes: F01D 5/087 in the radial passages of the rotor disc
• CPC Class Codes: F01D 5/3015 with side plates
• CPC Class Codes: F01D 5/3069 between two discs or rings
• CPC Class Codes: F04D 29/266 mounting compressor rotors on shafts
• CPC Class Codes: F05D 2260/30 Retaining components in desired mutual position
• CPC Class Codes: F05D 2260/33 with a bayonet coupling
• CPC Class Codes: F05D 2260/96 Preventing, counteracting or reducing vibration or noise

Abstract

A rotor, in particular a gas turbine rotor, having multiple rotor discs, each of which has an axial through-opening, and the rotor discs are axially clamped by at least one tie rod extending through the through-openings and are combined so as to form at least one rotor disc unit. At least one support ring which surrounds the tie rod and is in engagement with a paired rotor disc rests against the outer diameter of the tie rod, and the tie rod is supported against the rotor disc by the support ring. In order to axially secure the at least one support ring, at least one securing ring is provided which is secured to the paired rotor disc by a rotational lock and which holds the support ring against the rotor disc. The securing ring is prevented from unscrewing by a securing plate.

Claims

1. A rotor, comprising:

a plurality of rotor disks having in each case an axial through-hole, which rotor disks are axially clamped via at least one tie rod extending through the through-holes and are assembled to form at least one rotor disk unit,

at least one support ring, which encompasses the tie rod, that butts against the outside diameter of the tie rod, which support ring engages with an associated rotor disk and via which the tie rod is supported on the rotor disk,

at least one locking ring for axially securing the at least one support ring,

an antirotation lock, wherein the locking ring is fastened on the associated rotor disk by the antirotation lock and retains the support ring, and

a locking plate, wherein the locking ring is secured against unscrewing by the locking plate.

2. The rotor as claimed in claim 1,

wherein the locking plate engages with the locking ring and with the associated rotor disk.

3. The rotor as claimed in claim 1,

wherein the locking ring has a recess which accommodates the locking plate and extends in an L-shaped manner over an outer circumferential surface of the locking ring and over an end face of the locking ring which faces the associated rotor disk.

4. The rotor as claimed in claim 1,

wherein the associated rotor disk has a radially extending cutout on an outer end face for receiving the locking plate and is positioned in such a way that it aligns with the recess of the locking ring when this is in a locking position.

5. The rotor as claimed in claim 3,

wherein the locking plate has a Z-shaped design and is accommodated in the recess of the locking ring and in the cutout of the associated rotor disk.

6. The rotor as claimed in claim 1,

wherein the antirotation lock is designed as a bayonet connection.

7. The rotor as claimed in claim 6,

wherein the locking ring has radially projecting bayonet lugs distributed along its circumference which engage in an annular bayonet slot provided on the associated rotor disk, which bayonet slot has bayonet-lug receiving openings which are designed to correspond to the bayonet lugs and enable an axial insertion of the bayonet lugs into the bayonet slot.

8. The rotor as claimed in claim 6,

wherein the recess of the locking ring splits one of the bayonet lugs.

9. The rotor as claimed in claim 1,

wherein the support ring has a widening inside diameter, and

wherein the support ring engages by its free end of larger inside diameter in an annular slot which is provided on the associated rotor disk.

11. The rotor as claimed in claim 1,

wherein the rotor comprises a gas turbine rotor.

12. The rotor as claimed in claim 8,

wherein the recess of the locking ring splits one of the bayonet lugs in the middle.

10. A method for securing a locking ring for a rotor having a plurality of rotor disks having in each case an axial through-hole, which rotor disks are axially clamped via at least one tie rod extending through the through-holes and are assembled to form at least one rotor disk unit, at least one support ring, which encompasses the tie rod, butts against the outside diameter of the tie rod, which support ring engages with an associated rotor disk and via which the tie rod is supported on the rotor disk, the method comprising:

axially securing the at least one support ring with at least one locking ring, wherein the at least one locking ring is fastened on the associated rotor disk by an antirotation lock and retains the support ring; and

keeping the at least one support ring in engagement with an associated rotor disk, against unscrewing using a locking plate.