Molecular drag pumping mechanism

F - Mech Eng,Light,Heat,Weapons – 04 – D

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F04D 17/16 (2006.01) F04D 19/04 (2006.01)

Patent

CA 2662668

A vacuum pump comprises a drive shaft and a Siegbahn pumping mechanism. The Siegbahn pumping mechanism comprises a rotor element located on the drive shaft and an annular stator element located about the drive shaft and proximate the rotor element, the stator element comprising a plurality of walls extending towards the rotor element and defining a plurality of spiral channels. The stator element comprises a plurality of sections, with means such as a resilient member being located about the sections to urge the sections together, and thereby inhibit gas leakage between the sections of the stator element. The resilient member can also form a seal between the stator sections and a casing located about the pumping mechanism.

L'invention concerne une pompe à vide comprenant un arbre d'entraînement et un mécanisme de pompage Siegbahn. Le mécanisme de pompage Siegbahn comprend un élément de rotor monté sur l'arbre d'entraînement et un élément de stator annulaire monté autour de l'arbre d'entraînement et à proximité de l'élément de rotor, l'élément de stator comprenant une pluralité de parois s'étendant vers l'élément de rotor et définissant une pluralité de canaux en spirale. L'élément de stator comprend une pluralité de sections, ainsi que des moyens tels qu'un élément élastique monté autour des sections afin de rapprocher les sections, et d'empêcher ainsi une fuite de gaz entre les sections de l'élément de stator. L'élément élastique peut également former un joint d'étanchéité entre les sections de stator et un carter monté autour du mécanisme de pompage.

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