Method and device for sensing a clearance

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

Patent

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Details

F28D 19/04 (2006.01) F28D 17/02 (2006.01) F28F 27/00 (2006.01) G01B 13/02 (2006.01)

Patent

CA 2262931

The invention relates to a method and to an arrangement for sensing the clearance between an object and an object-adjacent surface. The process of sensing the clearance is intended for application particularly in the case of difficult ambient conditions, such as in dirty, corrosive environments and under varying temperature and pressure conditions, e.g. to measure and hold constant the clearance between the sector plates (3, 4) of a regenerative rotary air preheater and the end surfaces of the rotor (2, 8). The invention is characterized in that the sensing device (7) used is comprised of a compressed-air operated pipe (9) which is mounted on the object (3, 4) and which includes a sound-emitting opening (14) located adjacent the surface (8), wherewith changes in the distance (S) between the object (3, 4) and the surface (8) are represented by changes that occur in the frequency of the pipe (9).

L'invention concerne un procédé et un agencement servant à détecter l'espace libre entre un objet et une surface adjacente à cet objet. Ce procédé de détection est conçu pour s'appliquer notamment dans des conditions ambiantes difficiles, telles que des environnements sales et corrosifs, et dans des conditions de température et de pression variables, par exemple pour mesurer et maintenir constant l'espace situé entre les plaques à secteurs (3, 4) d'un préchauffeur d'air à régénération et rotatif et les surfaces d'extrémité du rotor (2, 8). L'invention est caractérisée en ce que le dispositif de détection (7) utilisé se compose d'un tuyau (9) commandé par de l'air comprimé, monté sur l'objet (3, 4) et comprenant une ouverture (14) émettant des sons et située au voisinage de la surface (8); grâce à cet agencement, des changements dans la distance (S) entre l'objet (3, 4) et la surface (8) sont représentés par des changements se produisant dans la fréquence de résonance du tuyau (9).

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