Turbomachine rotor assembly with two bladed-discs separated by a spacer

• US 6,655,920 B2
• Filed: 06/03/2002
• Issued: 12/02/2003
• Est. Priority Date: 06/07/2001
• Status: Expired due to Term

• Current Assignee: Safran Aircraft Engine Company
• Original Assignee: Snecma Moteurs
• Inventors: Gervais, Pascal, Guigli, Elisabeth, Thore, Monique, Beutin, Bruno, Brault, Michel
• Primary Examiner(s): Nguyen, Ninh H.
• Application Number:
  US10/159,126
• Publication Number:
  US 20020187046A1
• Time in Patent Office: 547 Days
• Field of Search: 415/115, 415/199.5, 416/198.R, 416/198.A, 416/95
• US Class Current: 416/198.00A
• CPC Class Codes: F01D 11/001 for sealing space between stator blade and rotor
• CPC Class Codes: F01D 11/008 by spacer elements between the blades, e.g. independent interblade platforms
• CPC Class Codes: F01D 11/02 by non-contact sealings, e.g. of labyrinth type for sealing space between rotor blade tips and stator F01D11/08
• CPC Class Codes: F01D 5/063 Welded rotors welding per se B23K
• CPC Class Codes: F01D 5/081 Cooling fluid being directed on the side of the rotor disc or at the roots of the blades F01D5/087 takes precedence
• CPC Class Codes: F01D 5/084 the fluid circulating at the periphery of a multistage rotor, e.g. of drum type
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

A spacer (36) made to be installed between two permanently connected discs (31 and 32), without a bolted flange, and comprising axial thrust (43, 47) as well as outer radial thrust (45, 48) alignment surfaces (41). It comprises moreover an outer cover (37) to provide sealing and a cooling passageway, and stiffening tongues (38) which accommodate thrust loads.

Claims

1. Turbomachine rotor assembly, comprising two bladed-discs (31,32) and a spacer (36), at least one of the discs (31) being equipped with serrations (3) to house the roots (4) of the blades (5), where the spacer (36) comprises a cover (37) surrounding the serrated disc (31);

tongues (38) which slot into the serrations (3);

internal radial thrust faces (41) on the matching faces (42) formed on one of the discs (31), and outer axial thrust faces (43, 47), the inner radial thrust faces (41) being located on the tongues (38), characterised in that the outer axial thrust faces form the primary faces (43) that press against one of the discs, and the secondary faces (47), opposite the primary faces (43) that press against an associated seal (7) on the other side of the discs.

2. Turbomachine rotor assembly according to the claim 1, characterised by the tongues and cover forming the boundaries of the cooling passageways of the discs, the passageways also extending into the serrations (3) and beneath the roots of the blades, and where the tongues (38) extend between the serrations (3), the primary outer axial thrust faces are located on the tongues, and the matching faces (42) located on a crown formed on the side of the first disc (31).

3. Rotor assembly according to one of the particular claims 1 or 2, characterised in that the discs (31, 32) are connected by a single attachment and where the spacer (36) is circular.

4. Turbomachine rotor assembly according to claim 3, characterized in that the spacer outer radial thrust faces (45, 48) are provided on the blades of one of the discs and on the seal.

5. Turbomachine rotor assembly according to claim 3, characterized in that the spacer is a composite material, but not the sealing tongues (17) which rub against the matching abradable rings (18).

6. Turbomachine rotor assembly according to one of the particular claims 1 or 2, characterised in that the spacer outer radial thrust faces (45, 48) are provided on the blades of one of the discs and on the seal.

7. Turbomachine rotor assembly according to claim 6, characterized in that the spacer is a composite material, but not the sealing tongues (17) which rub against the matching abradable rings (18).

8. Turbomachine rotor assembly according to one of the particular claims 1 or 2 characterised in that the spacer is a composite material, but not the sealing tongues (17) which rub against the matching abradable rings (18).