| 摘要 |
A motorised impeller assembly for delivering an air flow, the assembly comprising: a first, main air flow path 10 having an inlet 11and an outlet 15; a second, ancillary air flow path 29 having an inlet 25 and an outlet 27; an impeller 5 which delivers the air flows through the main and ancillary air flow paths; and a motor unit 7which comprises a drive motor 19, and a sensor 35 for sensing a characteristic of the ancillary air flow 29, this characteristic being representative of a flow rate of the main air flow 10 and enables control of the delivered air flow. The inlet 25 of the ancillary flow path may be less than 1% the size of the main flow inlet 11 and the sensor 35 may be a flow rate sensor, a temperature sensor, pressure sensor or an environmental sensor that may detect humidity or gas content. The invention aims to produce an uncomplicated assembly by locating the sensor 35 within the drive unit 19 in the impeller 5. |
