# US 9,039,014 B2 · Seal

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- Number: US 9,039,014 B2
- Document ID: US9039014B2
- Status: Granted
- Kind: B2
- Application number: 13/431,404
- Filed: 2012-03-27
- Published: 2012-10-04
- Granted: 2015-05-26
- Earliest claimed: 2011-04-04
- Assignees: ROLLS-ROYCE plc
- Applicants: Michael J Pekris; Gervas Franceschini; Terence V Jones
- Inventors: Michael J Pekris; Gervas Franceschini; Terence V Jones
- Web page: https://patentgrep.com/patent/US9039014B2

## CPC

- F16J 15/406: {by at least one pump}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A seal for sealing between two component parts permits a leakage flow of fluid from an upstream side of the seal to a downstream side of the seal. The seal has a jet-producing formation which produces one or more fluid jets that impinge on and thereby restrict the leakage flow.

## Claims

### Claim 1

A seal for sealing between two component parts, the seal permitting a leakage flow of fluid from an upstream side of the seal to a downstream side of the seal, the seal comprising:
a jet-producing formation which produces one or more fluid jets at a most downstream side of the seal that impinge on and thereby restrict the leakage flow as the flow exits the seal, wherein
the jet producing formation is formed as a fluid exit hole or holes disposed in a component of the seal,
the component of the seal is a backing plate, a cover plate or a clamping ring, and
the backing plate, the cover plate or the clamping ring includes at least one fluid exit hole disposed in a substantially axial and radial direction relative to the flow of the fluid.

### Claim 2 (depends on 1)

A seal according to claim 1, wherein the jet-producing formation is configured such that at least a component of the direction of the or each impinging fluid jet is opposite to the direction of the leakage flow.

### Claim 3 (depends on 1)

A seal according claim 1, wherein the jet-producing formation is configured such that at least a component of the direction of the or each impinging fluid jet is perpendicular to the direction of the leakage flow.

### Claim 4 (depends on 1)

A seal according to claim 1, wherein the seal is a rotary seal, the two component parts being coaxial with and rotating relative to each other.

### Claim 5 (depends on 4)

A seal according to claim 4, wherein one of the components is rotationally static and the other component rotates.

### Claim 6 (depends on 4)

A seal according to claim 4, wherein both the components rotate.

### Claim 7 (depends on 4)

A seal according to claim 4, wherein the jet-producing formation is configured such that the or each impinging fluid jet induces a swirl component in the leakage flow around the axis of rotation.

### Claim 8 (depends on 4)

A seal according to claim 4, wherein a plurality of fluid jets are circumferentially spaced around the seal.

### Claim 9 (depends on 4)

A seal according to claim 4, wherein a plurality of fluid jets are axially spaced along the seal.

### Claim 10 (depends on 1)

A seal according to claim 1 further comprising:
a by-pass formation which accepts fluid from the upstream side of the seal and delivers the accepted fluid to the jet-producing formation.

### Claim 11 (depends on 1)

A seal according to claim 1 further comprising:
an external fluid formation which accepts fluid from an external source and delivers the accepted fluid to the jet-producing formation.

### Claim 12 (depends on 1)

A seal according to claim 1, wherein the seal is a labyrinth seal, brush seal, leaf seal, air-riding seal, finger seal, or carbon seal.

### Claim 13 (depends on 1)

A seal according to claim 1, wherein the seal is disposed between two component parts of a gas turbine for sealing the two component parts.