| 摘要 |
A hot air/cold air dual-mode electric fan including a vane assembly having an electric heating coil in the mica sheets of each vane, a bakelite mount fixedly secured to the vane assembly and having a circuit board with backward female contacts, a barrel mounted inside a holder in front of a motor and having separated carbon brushes, a shaft mounted within the barrel and coupled to the motor and having male contacts respectively connected to the female contacts and separated copper rings respectively disposed in contact with each carbon brush, and a control circuit for controlling power supply to the electric heating coils and regulating its heating temperature, so that the vane assembly produces currents of cold air when the motor is started and power supply is cut from the electric heating coils by the control circuit, or currents of hot air when the motor is started and power supply is connected to the electric heating coil by the control circuit.
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