| 摘要 |
The invention is directed to an impeller (1) for a hair dryer or a hair dryer accessory device, which includes an impeller blade (6) by means of which the impeller (1) is adapted to be set in rotation about an axis (3) by a current of air (8). The impeller blade (6) possesses variable aerodynamic properties, particularly an effective surface impinged by the current of air (8) which is variable in response to the rotational frequency of the impeller blade (6). In particular the free end (7) of the impeller blade (6) is of an elastic configuration, causing it to be bent more or less severely under the action of the centrifugal force. This variation in the effective surface of the impeller blade (6) enables the rotational frequency of the impeller (1) to be maintained at an approximately constant value.
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