Hair dryer heater section providing uniform outlet air temperature distribution

Details

Inventors: Haastrup, Henrik K.;
Assignee: Clairol Incorporated (New York, NY)
Primary Examiner: Bartis; Anthony
Assistant Examiner:
Attorney, Agent or Firm: Warzecha; Gene

A heater section for hair dryers utilizing spirally wound sinusoidally shaped electric resistance heating wire wound about a plurality of radially extending insulating mica boards. The mica boards are axially aligned along the external surface of a central frustoconical/cylindrical motor shroud disposed within a frustoconically shaped dryer housing and are provided with notches to hold the heating wire. A portion of the air moved by the hair dryer fan is blown past the heating wire between the interior surface of the dryer housing and the motor shroud and a portion is blown past the motor between it and the motor shroud. The apertures in the mica boards and the frustoconical/cylindrical motor shroud facilitate the circulation of heated air within the dryer housing. The frustoconical shape of the front portion of the motor shroud adjacent the hair dryer nozzle enhances turbulence within the heater section to facilitate more uniform temperature distribution at the nozzle of the hair dryer.

DETAILED DESCRIPTION The aforementioned objects are accomplished by a heater section constructed in accordance with the principles of the present invention which comprises a spirally wound sinusoidally shaped resistance wire, wound about an axially aligned frustoconical/cylindrical motor shroud provided with perforated insulating boards radially extending from its external surface.
The motor shroud has a cylindrical portion which is provided with internal, radially extending ribs for receiving the fan motor, the ribs producing a space between the internal surface of the shroud and the motor housing for enabling cooling air to blow past the motor as the main air stream is blown past the resistance wire.
The downstream end of the cylindrical portion of the motor shroud is provided with a frustoconical extension for enhancing turbulance within the heater section to facilitate heat distribution at the nozzle opening.
The perforations in the individual insulating boards enable circulatin of the heated air spirally about the motor shroud thereby also facilitating heat distribution.

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