Patent ID: 6309184
Filing Date: 2001-10-30
Classification: F04B

Abstract:
A mobile shielding device (10), mounted on a vacuum flange (13) connecting in line a non-evaporable getter pump (GP) and a turbo pump (TMP), characterized by comprising a plurality of shielding metal members (11, 11', . . . ; 31, 31', . . . ) capable of automatically modifying their shape or orientation according to the temperature of the device itself, between two different configurations, in one first of which the shielding members are substantially co-planar and form a substantially continuous shield between the two pumps, whereas in the second configuration said members (11, 11', . . . ; 31, 31', . . . ) provide the lowest possible hindrance in the cross-section area of passage between the two pumps, ensuring the highest conductance, said shielding members comprising elements of a shape-memory material, of known type, which are responsive to the temperature for passing from a first shape, corresponding to a higher temperature in a range of working temperatures of the shape-memory material, associated with the said first configuration of the shielding members, to a second shape corresponding to a lower temperature in the same range of temperatures, being associated with the second configuration of the shielding members.