Alcatel Cit

Sebastien Frindel

Luc Mathieu

Jacques Mimeur

A vacuum pump of the type having a Gaede channel, the pump comprising a stator (1) and a rotor (2) driven to rotate inside the stator, the stator including a suction inlet (12) and a delivery outlet (13). The active portion of the rotor situated between the suction inlet and the delivery outlet is hemispherical in shape (9) and is disposed inside a cavity (10) of the stator which is likewise hemispherical in shape. The axis .delta. of said rotor coincides with the said axis of the hemispherical cavity of the stator. Suction takes place at the large circle end of the hemispherical rotor via radial clearance j.sub.a between the rotor and the stator, and delivery takes place at the pole end of the hemispherical rotor. An adjustment distance piece (14) for axially positioning the rotor (2) relative to the stator (1) is provided so that the radial delivery clearance j.sub.r is smaller than the radial suction clearance j.sub.a.

Vacuum pump of the type having a Gaede channel

A valve for a vacuum enclosure, the valve comprising a valve body (1) which is hollow about an axis .DELTA. and which opens out to the outside via two opposite end openings (24, 25) of the valve body, thereby enabling the valve to be inserted in a pumping circuit, the inside of said valve body being provided by closure means constituted by a strip (7) which is movable in its own plane, which plane extends perpendicularly to the axis .DELTA. said strip being provided with at least one opening (8) and being associated with two pay-out and take-up drums (9, 10) provided with drive means, said valve body being further provided with sealing means situated between the two drums and comprising a fixed gasket (15) fixed to the valve body and situated on a first side of the strip and a moving gasket system capable of moving parallel to the axis .DELTA. and situated on the other side of the strip from the fixed gasket, the valve being characterized in that said moving gasket system includes a plurality of balls (30) which are held spaced apart from one another around a circumference by means of a rotatable cage (31), the assembly comprising said balls and said cage being disposed between a clamping ring (34) which is axially displacable and which is provided with conical depressions (35) for receiving the balls and a plane portion (36) of the valve body which is also provided with conical depressions (37) for receiving the balls, said cage (31) being associated with means (32, 33) enabling it to be rotated thorugh an angle .alpha., the clamping ring being axially slidable in sealed manner along a cylindrical bearing surface (40) inside said valve body.

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Annecy le Vieux, France

Sebastien Frindel