Sealing arrangement for air preheater

F - Mech Eng,Light,Heat,Weapons – 28 – D

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F28D 19/00 (2006.01) F28D 19/04 (2006.01)

Patent

CA 1267404

Abstract of the Disclosure 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 can- tilevered 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 pre- heater 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 in- cludes a sharp bend adjacent its free distal edge to direct the free distal edge toward engagement with an annular sealing sur- face of the housing. - 57 -

492024

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