초록 ▼

A sealing arrangement for an air preheater for a fuel burning device includes both radial and circumferential seals. The radial seals include a set of flexible, foil-like metal sealing strips coupled to semi-rigid radial seal plates. The semi-rigid radial seal plates, in turn, are coupled to diaphra

A sealing arrangement for an air preheater for a fuel burning device includes both radial and circumferential seals. The radial seals include a set of flexible, foil-like metal sealing strips coupled to semi-rigid radial seal plates. The semi-rigid radial seal plates, in turn, are coupled to diaphragm members which divide a generally cylindrical drum of the air preheater into sectors, each sector containing a set of heat exchanger elements, such as parallel plates or fins. To effect sealing, the foil-like metal radial sealing strips will engage and wipe across sector plates on a housing surrounding the drum. The radial sealing strips are completely unobstructed from cantilevered yielding movement in a trailing direction to the full extent that the flexure characteristics of the radial sealing strips themselves permit. The circumferential sealing strips are also constructed of a flexible, thin, foil-like metal material. These circumferential strips are coupled to circumferential seal plates which, in turn, are connected to the drum of the air preheater adjacent the outer circumferential edges of the drum. The circumferential sealing strips yieldingly engage annular surfaces of the housing surrounding the drum to effect sealing between the drum and the housing. Each circumferential sealing strip includes a sharp bend adjacent its free distal edge to direct the free distal edge toward engagement with an annular sealing surface of the housing.

대표청구항 ▼

A radial seal for an air preheater, the air preheater having a generally cylindrical drum portion containing a set of heat exchanging elements and a housing portion surrounding said drum portion, said air preheater portions being movable with respect to each other to effect exchange of heat between

A radial seal for an air preheater, the air preheater having a generally cylindrical drum portion containing a set of heat exchanging elements and a housing portion surrounding said drum portion, said air preheater portions being movable with respect to each other to effect exchange of heat between a gas discharge passage of a fuel burning device and an air intake passage thereof, one of said air preheater portions being for mounting a seal, the other of said air preheater portions including a sealing surface, the radial seal comprising: (a) an elongated radial seal body which has a length and first and second side edges extending along said length, said radial seal body being for radial disposition with respect to the air preheater portions; (b) said radial seal body including means, adjacent said first side edge, for rigidly and fixedly mounting said radial seal body with respect to one of said preheater portions; (c) said second side edge of said radial seal body being a free, distal side edge, which side edge is disposed opposite said side edge whereby said radial seal body moves in response to irregularities in the sealing surface and irregularities between the first and second preheater portions to effect sealing therebetween; (d) said radial seal body including a plurality of strips arranged in a stack, which stack has a bottom and a top, the stack including a strip at the bottom of the stack which bottom strip extends fully from said first side edge to said second side edge of said seal body, each strip having oppositely disposed edges and a pair of faces extending between said oppositely disposed edges, said stack being so arranged that at least one face of each strip is in contiguous face-to-face overlying engagement with a face of at least one other strip in said stack, each succeeding strip in said stack after said bottom strip extending from said first side edge of said seal body toward but not completely to said second side edge of said radial seal body, certain of said succeeding strips extending toward said second side to a lesser extend than the strip therebelow in said stack so that said strips are disposed in a staggered, steplike arrangement; (e) said seal body including means for allowing said bottom sealing strip to yieldably ride over the sealing surface of the other of the air preheater portions when the air preheater portions are moving relative to each other during operation of the air preheaters.