| 摘要 |
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.
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