Patent ID: 8585349
Filing Date: 2013-11-19
Classification: E21B,F03B,H02K

Abstract:
1. A turbine for driving a generator, with a housing mountable in a drill string and having an inlet opening and an outlet opening for a fluid conveyed through the drill string, with at least one impeller arranged in the housing and adapted to be impinged upon by the fluid flowing into the housing, wherein the impeller is axially movably mounted and yieldably supported against the afflux direction in such a way that the supporting force of the yielding support increases as the axial movement of the impeller increases, and wherein the housing comprises a frontal first housing section of smaller inner diameter as seen in the afflux direction and a rear second housing section of larger inner diameter as seen in the afflux direction, wherein the first housing section and the second housing section are of cylindrical shape, are separated from one another by a radially outwardly extended shoulder forming a transition between the first and second housing sections, and both surround the range of motion of the impeller.