Composite ceramic device for measuring the temperature of...

G - Physics – 01 – K

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G01K 1/12 (2006.01) G01K 1/14 (2006.01)

Patent

CA 2525889

A thermocouple shield assembly (60) comprising a first tube (64) having an upper portion and a lower portion with a lower end, the first tube (64) including a first elongated cavity closed at the lower end and receiving the thermocouple (62), a second tube (66) having a second elongated cavity with at least one open end and receiving the upper portion while a part of the lower portion containing the thermocouple (62) extends out of the open end, and a gap (88) between adjacent walls of the second elongated cavity and of the first tube (64) such as to allow independent thermal deformations of the first and second tubes (64, 66). In use, at least a portion of the part of the lower portion of the first tube (64) is subjected to a given temperature while the second tube (66) is subjected to a different temperature. Methods of manufacturing and of assembling such a thermocouple shield assembly (60) are also presented.

Selon cette invention, un ensemble de protection de thermocouple (60) comprend un premier tube (64) pourvu d'une partie supérieure et d'une partie inférieure à extrémité inférieure. Le premier tube (64) comporte une première cavité allongée fermée au niveau de l'extrémité inférieure et loge le thermocouple (62). Cet ensemble possède également un second tube (66) pourvu d'une seconde cavité allongée dotée d'au moins une extrémité ouverte et logeant la partie supérieure, tandis qu'une portion de la partie inférieure renfermant le thermocouple (62) s'étend hors de l'extrémité ouverte, et un trou (88) situé entre les parois adjacentes de la seconde cavité allongée et du premier tube (64), de manière à permettre des déformations thermiques indépendantes des premier et second tubes (64,66). Lors de son utilisation, au moins une portion de la partie inférieure du premier tube (64) est soumise à une température donnée, tandis que le second tube (66) est soumis à une température différente. Cette invention concerne également des procédés de fabrication et d'assemblage d'un tel ensemble de protection de thermocouple (60).

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