Insert for a radiant tube

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

Patent

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F28F 13/12 (2006.01) F28F 21/04 (2006.01) F28F 21/08 (2006.01)

Patent

CA 2384375

An integral ceramic insert (24) for a radiant tube (10). The insert (24) has a helical shape and contains ceramic material; and it has a thermal expansion rate of less than 6.0 x 10E-6 meters/meter/degree Celsius and a thermal conductivity of at least 0.2 calories/centimeter/second/degree Celsius. The diameter of the insert (24) is from about 2 to about 10 inches, and it has a length such that the ratio of its length to its diameter is from about 2/1 to about 8/1. The helical shape of the insert (24) contains one or more pitches of from about 2 to about 32 inches, each which defines a helix angle of from about 15 to about 80 degrees.

L'invention concerne un insert en céramique (24) d'une seule pièce, destiné à un tube radiant (10). L'insert (24) présente une forme hélicoïdale, et contient un matériau en céramique. Le taux d'expansion thermique dudit insert est inférieur à 6,0 x 10E?-6¿ mètres/mètre/degré Celsius, et sa conductivité thermique au moins égale à 0,2 calories/centimètre/seconde/degré Celsius. Le diamètre de l'insert (24) est d'environ 2 à 10 pouces, et sa longueur est telle que le rapport de la longueur au diamètre est d'environ 2/1 à 8/1. La forme hélicoïdale de l'insert (24) contient au moins un pas d'environ 2 à 32 pouces, ce pas définissant un angle d'hélice d'environ 15 à 80 degrés.

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