Brush seal device

Patent metadata

Field	Value
Publication number	US-9234592-B2
Application number	US-201414424294-A
Country	US
Kind code	B2
Filing date	Feb 6, 2014
Priority date	Feb 6, 2013
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

The present invention is to provide a brush seal device capable of following displacement in a radial direction of a rotational shaft appropriately. The brush seal device prevents leakage of process fluid, wear of a brush seal etc., and leakage of process fluid from an outer circumferential side. The brush seal device 100 of the present invention includes an inner circumferential brush seal 120 and an outer circumferential brush seal 140 . The inner circumferential brush seal 120 has a brush portion 123 and a free end portion 125 at the inner circumferential side. The outer circumferential brush seal 140 is placed at an outer circumferential side of the inner circumferential brush seal 120 , and has a brush portion 143 and a free end portion 145 at the inner circumferential side.

First claim

The invention claimed is:

1. A brush seal device having a brush portion in which a plurality of bristles are arranged and sealing in an axial direction between a housing and a rotational shaft, the brush seal device comprising:
an inner circumferential brush seal part having an inner circumferential brush seal; and
an outer circumferential brush seal part having an outer circumferential brush seal, wherein
said inner circumferential brush seal comprises:
an attachment section provided at an outer circumferential side;
a brush portion in which a plurality of bristles are arranged from the attachment section to an inner circumferential direction; and
a free end portion which is an inner-circumferential-side end portion of the brush portion and is arranged opposite to an outer circumferential surface of the rotational shaft so as to contact or be adjacent to the outer circumferential surface, and
said outer circumferential brush seal comprises:
an attachment section provided at an outer circumferential side;
a brush portion in which a plurality of bristles are arranged from the attachment section to an inner circumferential direction; and
a free end portion which is an inner-circumferential-side end portion of the brush portion and is arranged opposite to an outer circumferential surface of the inner circumferential brush seal part so as to contact or be adjacent to the outer circumferential surface.

2. The brush seal device as set forth in claim 1 , wherein
at least one of said inner circumferential brush seal and said outer circumferential brush seal is a brush seal having a seal part and the free end portion formed on an inner circumferential side of a plurality of wire members bundled and arranged in a wall shape along a circumference and formed into a ring shape by welding an outer end portion of the wire members combined to one another.

3. The brush seal device as set forth in claim 1 , wherein
at least one of said inner circumferential brush seal and said outer circumferential brush seal comprises a plurality of plate brush seal unit discs integrally formed by axially laminating themselves,
the plate brush seal unit disc comprises:
the attachment section;
the brush portion having narrow beams as the bristles extending from the attachment section to an inner circumferential side and inclined with respect to a circumferential direction; and
the free end portion.

4. The brush seal device as set forth in claim 1 , wherein
the brush portion of the inner circumferential brush seal and the brush portion of the outer circumferential brush seal are composed of bristles of the same material.

5. The brush seal device as set forth in claim 1 , wherein
the brush portion of the inner circumferential brush seal and the brush portion of the outer circumferential brush seal are composed of bristles of different materials.

6. The brush seal device as set forth in claim 1 , wherein
a plurality of the bristles of the inner-circumferential-side brush portion of the inner circumferential brush seal are arranged toward an inner circumferential direction to be inclined with respect to a radial direction,
a plurality of the bristles of the outer-circumferential-side brush portion of the outer circumferential brush seal are arranged toward an inner circumferential direction to be inclined with respect to a radial direction, and
the bristles of the inner circumferential brush seal and the bristles of the outer circumferential brush seal are inclined oppositely with respect to the radial direction.

7. The brush seal device as set forth in claim 1 , further comprising:
a brush receiving part placed on the outer circumferential surface of the inner circumferential brush seal part so as to contact or be adjacent to the free end portion of the outer circumferential brush seal and to restrict a spreading out in an axial direction of the free end portion of the outer circumferential brush seal.

8. The brush seal device as set forth in claim 1 , wherein
the outer circumferential brush seal is formed to be inclined with respect to the axial direction of the rotational shaft.

Assignees

• Eagle Ind Co Ltd

Inventors

• Inoue Hideyuki

Classifications

• F02C7/28

  Arrangement of seals · CPC title

• F16J15/3288 Primary

  Filamentary structures, e.g. brush seals · CPC title

• F16J15/3268

  Mounting of sealing rings · CPC title

• F01D11/00

  Preventing or minimising internal leakage of working-fluid, e.g. between stages (sealings in general F16J {; sealing arrangements for transition ducts of combustor cans F01D9/023}) · CPC title

• F01D11/001 Primary

  for sealing space between stator blade and rotor · CPC title