Impeller to shaft coupling

F - Mech Eng,Light,Heat,Weapons – 04 – D

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Details

F04D 29/26 (2006.01) F04D 17/12 (2006.01)

Patent

CA 2352189

A refrigeration unit having a compressor (12) includes a refrigerant gas inlet (11), a drive shaft (28) and at least one compression stage. At least one compression stage includes at least one impeller (37, 41) with a hub, the hub (36, 42) having a radially lobed bore. The drive shaft has a radially lobed portion complementary to the radially lobed bore of the impeller hub. The lobed portion of the drive shaft is received in the bore to define a coupling for transmitting torque from the drive shaft to the impeller. This coupling may have three lobes.

L'invention concerne une unité de réfrigération à compresseur (12) comprenant une entrée (11) de gaz réfrigérant, un arbre (28) d'entraînement et au moins un étage de compression. Un étage de compression au moins comprend une roue (37, 41) au moins, pourvue d'un moyeu, ledit moyeu (36, 42) comportant un alésage radialement lobé. L'arbre d'entraînement comporte une partie radialement lobée complémentaire de l'alésage radialement lobé du moyeu de la roue. La partie lobée de l'arbre d'entraînement est reçue dans l'alésage, de manière à définir un accouplement permettant de transmettre le couple de l'arbre d'entraînement à la roue. Ce couplage peut comporter trois lobes.

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