Deformable brush seal support
View Patent ↗A brush seal is provided for sealing between a rotating shaft and a housing. The brush seal includes an annular rim or head portion coaxial with the shaft and mounted on the housing, an annular array of bristles extending from the head portion toward the shaft for contact with the shaft at their ends, and an annular bristle support plate extending from the head portion toward the shaft. The support includes voids arranged to accommodate radial deformation in the support due to rubbing contact between the support and the shaft without incurring any substantial accompanying axial deformation which would distort the bristles and cause deterioration of their sealing function.
1. A brush seal for sealing between a rotating shaft and a housing, the brush seal comprising:
a) an annular head portion coaxial with the shaft and mounted on the housing;
b) an annular array of bristles extending from the head portion toward the shaft for contact therewith at their end portions; and
c) a rigid annular support having axially opposed annular surfaces and extending from the head portion toward the shaft and providing the array of bristles with support against axial deflection due to pressure differences across the seal, wherein the support includes a plurality of angularly spaced apart slots that extend outwards from a radially innermost surface of the support toward the head portion, the slots having radial and axial dimensions sufficient to allow the support to plastically deform in a radial direction by at least partial occlusion of the slots, and without significant plastic deformation in an axial direction, when there is rubbing contact between the support and the shaft.
2. The brush seal according to claim 1 , in which the slots extend between the axially opposed annular surfaces of the support.
3. The brush seal according to claim 1 , in which the slots comprise channels formed in one of the axially opposed annular surfaces of the support.
4. The brush seal according to claim 1 , in which the slots are radially oriented.
5. The brush seal according to claim 1 , in which the bristles are angled in the circumferential direction with respect to a normal radius of the shaft, such that the bristles lie transversely of a major dimension of each slot.