Drilling turbine

Details Drilling turbine Drilling turbine

E - Fixed Constructions

21

B

E21B 4/02 (2006.01) F01D 5/28 (2006.01) F01D 11/18 (2006.01)

Patent

CA 2413374

A turbine (10) is disclosed which includes a turbine blade housing (14) having an inner facing portion (22) of a first material having a first coefficient of expansion, and a turbine blade body (16) having an outer facing portion (24) of a second coefficient of expansion greater than said first coefficient. In a preferred embodiment, the blade housing (14) comprises a number of steel shroud rings (26) and the turbine blade body (16) comprises a number of stators (32) and rotors (34) of a thermoplastic material. An interference fit between stator blades (38) and the shroud rings (26) is enhanced in use due to the difference in thermal and/or hydrophilic coefficients of expansion of the first and second materials.

L'invention concerne une turbine (10) comprenant un logement (14) d'aube de turbine dont une partie (22) d'une face intérieure réalisée dans un premier matériau présente un premier coefficient d'expansion, et un corps (16) d'aube de turbine dont une partie (24) d'une face extérieure présente un second coefficient d'expansion plus grand que ledit premier coefficient. Dans un mode de réalisation préféré, le logement (14) d'aube comprend un certain nombre de couronnes (26) d'enveloppe en acier et le corps (16) d'aube de turbine comprend un certain nombre de stators (32) et de rotors (34) en matériau thermoplastique. Un ajustement avec serrage entre des aubes (38) de stator et les couronnes (26) d'enveloppe est amélioré, pendant son utilisation, grâce à la différence entre les coefficients thermiques et/ou hydrophiles d'expansion des premier et second matériaux.

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