| 摘要 |
A sealing system (10) for heat exchangers of the type having a plurality of vertically positioned heat tubes (14) extending through a heat tube sheet (16). The sealing system (10) including a first outer ring (40) having a wall portion (42), terminating in an upper face (43), and defining an annular space (47) between the lower end portion (44) of the outer ring (40) and the heat tube (14) and tube sheet (16); a high-nickel metal inner ring (60), positioned within the annular space (47) surrounding the heat tube (14) and resting on the tube sheet (16); a soft metal casing (66) partially housing the high-nickel inner ring (60) so that when force is applied downward on the first outer ring (40), the annular space (47) is reduced sufficiently to force the high-nickel ring (60) and the soft metal casing (66) into a sealing relationship between the heat tube (14) and the tube sheet (16), while allowing for vertical movement of the heat tube (14); the outer ring (40) further defining a means to prevent the high-nickel ring (60) and the soft metal casing (66) to be crushed by the downwardly applied force; and a pressure collar (87) surrounding the sealing system (10) for applying the force to effect the seal between the heat tube (14) and tube sheet (16). <IMAGE>
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