Patent ID: 7351034

Claim:
Impeller device for data acquisition in a flow, comprising a support ( 3 ) to hold a spindle ( 2 ) around which the impeller ( 1 ) is fitted, two bearing blocks ( 4 . 1 , 4 . 2 ) mounted on the support ( 3 ), these bearing blocks ( 4 . 1 , 4 . 2 ) being made from a material chosen from among alumina, corundum, diamond and sapphire, wherein: each of the bearing blocks comprises an approximately conical recess ( 6 ) into which one of the ends ( 5 ) of the spindle ( 2 ) fits, the ends of the spindle ( 2 ) being approximately conical; the two bearing blocks ( 4 . 1 , 4 . 2 ) are fixed with respect to the support ( 3 ), and the spindle ( 2 ) of the impeller ( 1 ) is retractable.