Rotor with a locking plate for securing an antirotation lock against unscrewing

• US 10,641,096 B2
• Filed: 01/07/2016
• Issued: 05/05/2020
• 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, Schroder, Peter, Veitsman, Vyacheslav
• Primary Examiner(s): Amick, Jacob M
• Assistant Examiner(s): Picon-Feliciano, Rubin
• Application Number:
  US15/550,198
• Publication Number:
  US 20180023394A1
• Time in Patent Office: 1,580 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 comprising in each case an axial through-hole, which rotor disks are axially clamped via at least one tie rod extending through the axial through-holes and are assembled to form at least one rotor disk unit,

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

at least one locking ring that abuts the at least one support ring, that is axially interlocked directly with the associated rotor disk via a connection, and that captures the at least one support ring between the at least one locking ring and the associated rotor disk, wherein engaging the connection requires rotation of the at least one locking ring relative to the associated rotor disk, and

a locking plate configured to prevent the rotation of the at least one locking ring once the connection is engaged,

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

2. The rotor as claimed in claim 1,

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

3. The rotor as claimed in claim 1,

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

4. The rotor as claimed in claim 1,

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

5. The rotor as claimed in claim 1,

wherein the connection comprises a bayonet connection.

6. The rotor as claimed in claim 5,

wherein the at least one locking ring comprises radially projecting bayonet lugs distributed along its circumference which engage in an annular bayonet slot provided on the associated rotor disk, which bayonet slot comprises 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 prior to the rotation of the at least one locking ring to engage the connection.

7. The rotor as claimed in claim 5,

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

8. The rotor as claimed in claim 7,

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

9. The rotor as claimed in claim 1,

wherein the at least one support ring comprises a widening inside diameter, and

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

10. The rotor as claimed in claim 1,

wherein the rotor comprises a gas turbine rotor.

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

axially securing the at least one support ring with the at least one locking ring, wherein the at least one locking ring abuts the support ring, is axially interlocked directly with the associated rotor disk by a connection, and captures the at least one the support ring between the at least one locking ring and the associated rotor disk, wherein engaging the connection requires rotation of the at least one locking ring relative to the associated rotor disk; and

keeping the at least one support ring in engagement with the associated rotor disk by using a locking plate configured to prevent the rotation of the at least one locking ring once the connection is engaged,

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

12. A rotor, comprising:

a tie rod;

a plurality of rotor disks clamped together by the tie rod that extends therethrough;

a support ring that;

surrounds and abuts the tie rod;

that that directly engages with an associated rotor disk of the plurality of rotor disks; and

through which the associated rotor disk supports the tie rod;

a locking ring that abuts the support ring, that is axially interlocked directly with the associated rotor disk via a connection, and that captures the support ring between the locking ring and the associated rotor disk, wherein engaging the connection requires rotation of the locking ring relative to the associated rotor disk; and

a locking plate configured to engage a cutout in the associated rotor disk and to engage a recess in the locking ring, thereby preventing circumferential movement of the locking ring relative to the associated rotor disk and thereby maintain the connection,

wherein the recess 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.

13. The rotor of claim 12,

wherein the locking ring comprises a radial projection comprising the recess;

wherein the associated rotor disk comprises a slot;

wherein the locking ring engages the associated rotor disk by moving the radial projection axially into the slot and then moving the radial projection circumferentially within the slot until the recess aligns with the cutout; and

wherein a free end of the locking plate is bent into the cutout to form a Z-shaped locking plate that circumferentially interlocks the locking ring to the associated rotor disk.