# US 10,480,338 B2 · Bladed rotor arrangement including axial projection

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- Number: US 10,480,338 B2
- Document ID: US10480338B2
- Status: Granted
- Kind: B2
- Application number: 14/848,788
- Filed: 2015-09-09
- Published: 2016-03-31
- Granted: 2019-11-19
- Earliest claimed: 2014-09-26
- Assignees: ROLLS-ROYCE plc
- Applicants: Rolls-Royce PLC
- Inventors: Michael Webb
- Web page: https://patentgrep.com/patent/US10480338B2

## CPC

- F01D 11/006: {Sealing the gap between rotor blades or blades and rotor}
- 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 5/081: {Cooling fluid being directed on the side of the rotor disc or at the roots of the blades (F01D5/087 takes precedence)}
- F01D 5/141: {Shape, i.e. outer, aerodynamic form (F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147)}
- F01D 5/3007: {of axial insertion type}
- F01D 5/3015: {with side plates}
- F01D 5/326: {Locking of axial insertion type blades by other means}
- F05D 2220/30: in turbines
- F05D 2240/24: for turbines
- F05D 2240/30: Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D 2240/55: Seals
- F05D 2260/30: Retaining components in desired mutual position
- 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

A bladed rotor arrangement comprising a rotor, a plurality of rotor blades, at least one seal plate and a plurality of lock plates. Each rotor blade locates in a corresponding axially extending slot in the rotor. A plurality of lock plates are arranged at a first axial end of the rotor, the radially outer ends of the lock plates engage grooves on the platforms of the rotor blades, and the radially inner ends of the lock plates engage a circumferentially extending groove. The seal plate is arranged at the first axial end of the rotor, the radially inner ends of the lock plates engage the circumferentially extending groove defined by the seal plate. The seal plate has at least one projection extending axially from the seal plate and arranged to locate in a slot in a first axial end of the root of a rotor blade.

## Claims

### Claim 1

A bladed rotor arrangement comprising:
a rotor including a plurality of circumferentially-spaced, axially-extending slots in a periphery of the rotor, the rotor having a first axial end and a second axial end;
a plurality of rotor blades mounted on the periphery of the rotor, each rotor blade of the plurality of rotor blades including:
an aerofoil,
a platform having at least one radially inwardly extending flange,
a shank, and
a root disposed in a corresponding axially-extending slot of the plurality of axially-extending slots of the rotor;
a first seal plate and a second seal plate, the first seal plate being disposed at the first axial end of the rotor and having a projection inserted axially into a secondary slot disposed in a first axial end of the root of a rotor blade of the plurality of rotor blades, the root of the rotor blade of the plurality of rotor blades surrounding each circumferential-facing surface of the inserted projection; and
a plurality of first lock plates disposed at the first axial end of the rotor, each lock plate of the plurality of first lock plates having a radially inner end and a radially outer end, the radially outer end of each first lock plate of the plurality of first lock plates engaging at least one first groove formed by at least one flange of the platforms of the plurality of rotor blades, the radially inner end of each first lock plate of the plurality of first lock plates engaging a circumferentially extending second groove formed by the first seal plate.

### Claim 2 (depends on 1)

The bladed rotor arrangement as claimed in claim 1, further comprising:
a plurality of second lock plates arranged at a second axial end of the rotor, the radially outer ends of each second lock plate of the plurality of second lock plates at the second axial end of the rotor engaging at least one third groove defined by at least one secondary radially inwardly extending flange on the platforms of the rotor blades,
the second seal plate being arranged at the second axial end of the rotor, the radially inner ends of each second lock plate of the plurality of second lock plates at the second axial end of the rotor engaging a circumferentially extending groove at least partially defined by the second seal plate,
the second seal plate having a second projection inserted axially into a tertiary slot disposed in a second axial end of the root of the rotor blade of the plurality of rotor blades.

### Claim 3 (depends on 2)

The bladed rotor arrangement as claimed in claim 2, wherein
the first seal plate includes a plurality of projections axially inserted from the first seal plate into a plurality of secondary slots disposed in the first axial end of the root of the rotor blade of the plurality of rotor blades, and
the second seal plate includes a plurality of secondary projections axially inserted from the first seal plate into a plurality of tertiary slots in the second axial end of the root of the rotor blade of the plurality of rotor blades.

### Claim 4 (depends on 3)

The bladed rotor assembly as claimed in claim 3, wherein:
the first seal plate includes an axially extending flange defining the circumferentially extending second groove, and
the second seal plate includes an axially extending flange defining the circumferentially extending second groove.

### Claim 5 (depends on 4)

The bladed rotor assembly as claimed in claim 4, wherein:
the projections extend from the axially extending flange on the first seal plate, and
the projections extend from the axially extending flange on the second seal plate.

### Claim 6 (depends on 5)

The bladed rotor arrangement as claimed in claim 5, wherein the second face of each lock plate of the plurality of lock plates includes at least one pocket.

### Claim 7 (depends on 6)

The bladed rotor arrangement as claimed in claim 6, wherein the second face of each first lock plate of the plurality of first lock plates includes a plurality of pockets.

### Claim 8 (depends on 5)

The bladed rotor arrangement as claimed in claim 5, wherein the second face of each first lock plate of the plurality of first lock plates has a projection axially inserted in a secondary slot in the root of a rotor blade.

### Claim 9 (depends on 1)

The bladed rotor arrangement as claimed in claim 1, wherein the first seal plate includes a plurality of projections axially inserted from the first seal plate into a plurality of secondary slots disposed in the first axial end of the root of the rotor blade of the plurality of rotor blades.

### Claim 10 (depends on 9)

The bladed rotor arrangement as claimed in claim 9, wherein the first seal plate at the first axial end of the rotor includes an axially extending flange defining the circumferentially extending groove.

### Claim 11 (depends on 10)

The bladed rotor arrangement as claimed in claim 10, wherein the plurality of projections extend from the axially extending flange on the first seal plate at the first axial end of the rotor.

### Claim 12 (depends on 1)

The bladed rotor arrangement as claimed in claim 1, wherein:
the roots of the plurality of rotor blades are selected from the group consisting of fir tree shaped roots and dovetail shaped roots, and
the axially extending slots are correspondingly shaped to receive the roots of the plurality of rotor blades.

### Claim 13 (depends on 1)

The bladed rotor arrangement as claimed in claim 1, wherein each first lock plate of the plurality of first lock plates includes a first face facing away from the rotor and a second face facing the rotor.

### Claim 14 (depends on 13)

The bladed rotor arrangement as claimed in claim 13, wherein the second face of each first lock plate of the plurality of first lock plates includes at least one channel and at least one deflector, the at least one channel extending radially from the radially inner end of each first lock plate of the plurality of first lock plates towards the radially outer end of each first lock plate of the plurality of first lock plates, the at least one deflector being arranged at the radially outer end of the at least one channel, the at least one deflector extending axially from the second surface of each lock plate of the plurality of first lock plates.

### Claim 15 (depends on 14)

The bladed rotor arrangement as claimed in claim 14, wherein the second face of each first lock plate of the plurality of first lock plates includes a plurality of channels and a plurality of deflectors, each channel of the plurality of channels extending radially from the radially inner end of each first lock plate of the plurality of first lock plates towards the radially outer end of each first lock plate of the plurality of first lock plates, each deflector of the plurality of deflectors being arranged at the radially outer end of a corresponding channel of the plurality of channels, each deflector of the plurality of deflectors extending axially from the second surface of each first lock plate of the plurality of first lock plates.

### Claim 16 (depends on 1)

The bladed rotor arrangement as claimed in claim 1, further comprising a turbine disc and a plurality of turbine rotor blades.