DEVICE FOR FIXING A VACUUM PUMP

The invention concerns a fixing device comprising a coaxial annular flange (14) wherein are provided through holes (16) designed to be traversed each by a screw (17) urged to be screwed in an associated tapped hole (15) of the wall of a fixed structure. The through holes (16) comprise a rotary cylin...

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Main Authors BOUILLE, ANDRE, MATHES, RAINER, DULAC, ERIC, DAUVILLIER, OLIVIER, SAVRY, CHRISTIAN
Format Patent
LanguageEnglish
French
Published 22.04.2004
Edition7
Subjects
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Summary:The invention concerns a fixing device comprising a coaxial annular flange (14) wherein are provided through holes (16) designed to be traversed each by a screw (17) urged to be screwed in an associated tapped hole (15) of the wall of a fixed structure. The through holes (16) comprise a rotary cylindrical distal section (16a) followed by a flared proximal section (16b) adjacent to the structure wall (2) allowing bending of the screw stem (19) and a corresponding lateral offset (D), thereby preventing the screw (17) from breaking under the effect of considerable shearing loads resulting from accidental damage to a vacuum pump rotor operating at high rotational speed. Le dispositif de fixation selon l'invention comprend une bride (14) annulaire coaxiale dans laquelle sont prévus des trous traversants (16) destinés à être traversés chacun par une vis (17) venant se visser dans un trou taraudé (15) associé de la paroi (2) d'une structure fixe. Les trous traversants (16) comprennent un tronçon distal (16a) cylindrique de révolution suivi d'un tronçon proximal (16b) élargi adjacent à la paroi (2) de structure fixe et autorisant une flexion de la tige (19) de vis et un décalage latéral (D) correspondant. On évite ainsi la rupture de la vis (17) lors d'efforts de cisaillement importants dus à la destruction accidentelle d'un rotor de pompe à vide lancé à pleine vitesse de rotation.
Bibliography:Application Number: WO2003FR02586