Patent ID: 8806750

Claim:
A forced oscillation radial seal to prevent leaks of air stream to a gas stream in regenerative air preheaters containing rotatable radial plates having upper and lower edges, comprising: a base with a first portion and a second free portion, the first portion fixedly attached to a lateral face of the plates adjacent to their upper and lower edges; a pivot system having an axis attached to the second free portion of the base, a rigid sealing sheet with a first free portion, an opposite second portion, and a central portion, the rigid sealing sheet attached at its central portion to the pivot system; a counterweight attached to the rigid sealing sheet so that the rigid sealing sheet reassumes a vertical position after forming a seal with a sealing surface, and a plurality of springs in contact with the rigid sealing sheet and the base along the axis of the pivot system that cooperate with the counterweights to force the seal to oscillate.