# US 11,078,918 B2 · Inter-blade platform seal

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,078,918 B2
- Document ID: US11078918B2
- Status: Granted
- Kind: B2
- Application number: 16/733,620
- Filed: 2020-01-03
- Published: 2020-07-09
- Granted: 2021-08-03
- Earliest claimed: 2019-01-04
- Assignees: Safran Aircraft Engines; Safran
- Applicants: Safran Aircraft Engines; Safran
- Inventors: Thibaut Dominique Augustin Girard; Lola Auliac; Jérémy Guivarc'h; Jérémy Philippe Pierre Edynak; Pierre Jean Faivre D'Arcier
- Web page: https://patentgrep.com/patent/US11078918B2

## CPC

- F04D 29/083: {especially adapted for elastic fluid pumps}
- F01D 5/02: Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28})
- F01D 11/006: {Sealing the gap between rotor blades or blades and rotor}
- F01D 11/008: {by spacer elements between the blades, e.g. independent interblade platforms}
- F04D 29/322: {Blade mountings}
- F05D 2220/36: specially adapted for the fan of turbofan engines
- F05D 2240/20: Rotors
- F05D 2240/55: Seals
- F05D 2240/80: Platforms for stationary or moving blades
- F05D 2260/36: by a form fit connection, e.g. by interlocking
- F05D 2260/38: by a spring, i.e. spring loaded or biased towards a certain position
- F05D 2300/43: Synthetic polymers, e.g. plastics; Rubber
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

Seal (10) for an inter-blade platform intended to extend circumferentially about an axis and to be mounted between two axial ends of the inter-blade platform, including a first part (10a) in contact with a first blade adjacent to a first circumferential end of the platform, and a second part (10b) in contact with a second blade adjacent to a second circumferential end of the platform, the first part (10a) and the second part (10b) of the seal (10) being fixed to each other such that a displacement in the circumferential direction of one of the two parts (10a, 10b) of the seal (10) causes a displacement of the other part (10a, 10b) of the seal (10) in the same direction, when the two parts (10a, 10b) of the seal (10) are fixed to each other.

## Claims

### Claim 1

An inter-blade platform comprising a seal configured to extend circumferentially about an axis and to be mounted between two axial ends of the inter-blade platform, the seal comprising at least a first part configured to be in contact with a first blade circumferentially adjacent to a first circumferential end of the platform, and at least a second part configured to be contact with a second blade circumferentially adjacent to a second circumferential end of the platform, the first part and the second part of the seal being distinct from each other and being configured to be fixed to each other such that a displacement in one circumferential direction of one of the first or second part of the seal causes a displacement of the other one of the first or second part of the seal in the same direction, when the first part and the second part of the seal are fixed to each other, wherein a first structural portion and/or a second structural portion of the seal comprises at least one tab, and the inter-blade platform comprises a box delimited by a flowpath wall to define an air flowpath, the box comprising at least one lateral passage, wherein the at least one lateral passage is an orifice formed in a lateral wall of the box configured to accommodate the at least one tab and to allow displacement of the seal extending on either side of the platform in a circumferential direction, radially under the flowpath wall.

### Claim 2 (depends on 1)

The inter-blade platform according to claim 1, wherein the first part of the seal comprises a first contact portion made of elastomeric material, the first contact portion being configured to be in contact with the first circumferential end of the platform and the first blade circumferentially adjacent to the first circumferential end of the platform, and the second part of the seal comprises a second contact portion made of elastomeric material, the second contact portion being configured to be in contact with the second circumferential end of the platform and the second blade circumferentially adjacent to the second circumferential end of the platform.

### Claim 3 (depends on 1)

The inter-blade platform according to claim 1, wherein the first part of the seal comprises the first structural portion, and the second part of the seal comprises the second structural portion, the first structural portion and the second structural portion being configured to be assembled with each other.

### Claim 4 (depends on 3)

The inter-blade platform according to claim 3, wherein each of the first and second structural portions comprises a metal material.

### Claim 5 (depends on 3)

The inter-blade platform according to claim 3, wherein the at least one tab extends circumferentially, one circumferential end of the at least one tab being configured to come into contact with the other one of the first and second structural portions.

### Claim 6 (depends on 5)

The inter-blade platform according to claim 5, wherein the first part of the seal comprises at least a first attachment part fixed to at least one tab of the first structural portion, and the second part of the seal comprises at least a second attachment part fixed to at least one tab of the second structural portion, the first and second attachment parts being configured to cooperate together so as to assemble the first part of the seal to the second part of the seal.

### Claim 7 (depends on 1)

A rotor comprising a disk at the periphery of which a plurality of blades and a plurality of inter-blade platforms according to claim 1 are mounted, each platform being disposed between each pair of circumferentially adjacent blades.

### Claim 8 (depends on 7)

A turbomachine comprising a rotor according to claim 7.