Pressure seal for a vacuum pump
AssigneeAlcatel
InventorsPascal Durand, Emmanuel Bourgeois
Life of this patent
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Abstract
The invention concerns a vacuum pump consisting in the assembly of two stator half-shells (101, 102) and two directly mounted end parts (31, 32) with an interposed single-piece continuous pressure seal (33). The pressure seal (33) comprises two annular end parts (34, 35) generally parallel to each other and connected by two side-members (36, 37) which are generally perpendicular thereto. Thus, the number of components to be assembled to produce an multistage dry vacuum pump is reduced, while providing satisfactory impermeability to outside atmosphere.
Claims11
A multistage dry vacuum pump selected from a group consisting of Roots type multistage pumps, claw type pumps, and combined Roots-and-claw type pumps, and made up of a plurality of compression stages placed in series, the pump having at least one rotor mounted to rotate in a stator that is closed at its ends by two fitted pieces, the stator being made by radially assembling together two half-shells on a longitudinal assembly surface, each compression stage thus being contained in two corresponding portions of each of the half-shells, the two half shells, once assembled together, containing all of the compression stages, wherein a continuous one-piece gasket serves to provide both peripheral radial sealing in the longitudinal assembly surface of the half-shells, and axial end sealing between the half-shells and the fitted end pieces so as to isolate the compression stages from the outside atmosphere.
Dependencies are inferred from the claim text.