Brush seal for turbo-engines

Brush seal assembly for a turbo engine of the type having an engine rotor and an engine stator, comprising:

• a bristle bundle,
• a bundle holder holding the bundle in a sealing position with respect to a gap between the engine rotor and engine stator intermediate an upstream high pressure space and a downstream low pressure space, and
• an axially and radially movable covering ring disposed at the upstream side of the bristle bundle,
• wherein upstream and downstream circumferential webs are provided on the bundle holder which guide the bundle with a circumferentially extending axial gap between the bundle and the upstream web during operation of the turbo engine with a rotating engine rotor,
• wherein said covering ring is disposed in the axial gap and is displaceable with respect to the bristle bundle in response to differential pressure between the upstream and downstream spaces,
• wherein the covering ring projects radially at the axial gap with respect to ends of the webs to form a radial sealing gap which is narrower than a tap between ends of said webs and a facing rotor, and
• wherein the covering ring is located between the webs and includes a radial inward portion which projects radially inwardly out of the axial gap with respect to radial inward ends of the webs surrounding the engine shaft at a distance and surrounds the engine shaft by means of a radial sealing gap.

A turbo engine assembly including an engine rotor, an engine stator surrounding the engine rotor, and a brush seal assembly interposed between the rotor and stator, said brush seal assembly comprising:

• a bristle bundle,
• a bundle holder holding the bundle in a sealing position with respect to a gap between the engine rotor and engine stator intermediate an upstream high pressure space and a downstream low pressure space, and
• an axially and radially movable covering ring disposed at the upstream side of the bristle bundle,
• wherein upstream and downstream circumferential webs are provided on the bundle holder which guide the bundle with a circumferentially extending axial gap between the bundle and the upstream web during operation of the turbo engine with a rotating engine rotor,
• wherein said covering ring is disposed in the axial gap and is displaceable with respect to the bristle bundle in response to differential pressure between the upstream and downstream spaces,
• wherein the covering ring projects radially at the axial gap with respect to ends of the webs to form a radial sealing gap which is narrower than a tap between ends of said webs and a facing rotor, and
• wherein the covering ring is located between the webs and includes a radial inward portion which projects radially inwardly out of the axial gap with respect to radial inward ends of the webs surrounding the engine shaft at a distance and surrounds the engine shaft by means of a radial sealing gap.