Hairdryer

Abstract

Provided is a hairdryer comprising a cylindrical main body housing having a gas discharge portion on the front side thereof, a heater module located inside the main body housing to provide heat, and a handle housing connected to the lower portion of the main body housing, wherein the heater module comprises: a cylinder-shaped first heater case; a second heater case spaced apart from the outer circumference of the first heater case; a main flow path formed between the first heater case and the second heater case; a heating wire located in the main flow path; a front substrate disposed inside the first heater case; and an auxiliary flow path extending through the inside of the first heater case.

What is claimed is: 
     
         1 . A hairdryer comprising:
 a cylindrical body housing comprising a gas discharge portion at a front surface thereof;   a heater module positioned in the body housing and configured to provide heat; and   a handle housing connected to a lower portion of the body housing,   wherein the heater module comprises:   a first heater case having a cylindrical shape;   a second heater case disposed around an outer periphery of the first heater case in a state of being spaced apart from the outer periphery of the first heater case;   a main passage defined between the first heater case and the second heater case;   a heating wire positioned at the main passage;   a front board positioned in the first heater case; and   a subsidiary passage extending through an inside of the first heater case.   
     
     
         2 . The hairdryer of  claim 1 , wherein the first heater case comprises:
 a cylindrical lateral surface portion;   a front surface portion positioned at the lateral surface portion so as to face the gas discharge portion; and   a rear surface portion positioned opposite the front surface portion, and   wherein the subsidiary passage is connected between the rear surface portion and the front surface portion.   
     
     
         3 . The hairdryer of  claim 2 , further comprising:
 a plurality of vent holes formed through the rear surface of the first heater case; and   a subsidiary discharge port formed in the front surface portion of the first heater case,   wherein the subsidiary passage is connected between the plurality of vent holes and the subsidiary discharge port.   
     
     
         4 . The hairdryer of  claim 3 , further comprising:
 a cone cover positioned in a center of a main discharge port of the body housing; and   a ring cover positioned around the cone cover,   wherein the subsidiary discharge port is a gap between the cone cover and the ring cover.   
     
     
         5 . The hairdryer of  claim 3 , wherein the plurality of vent holes are arranged along a periphery of the rear surface portion. 
     
     
         6 . The hairdryer of  claim 2 , further comprising a heat insulation tube which is positioned an inner periphery of the lateral surface portion and has a thermal conductivity lower than the lateral surface portion. 
     
     
         7 . The hairdryer of  claim 2 , further comprising:
 an ion generator fastened to the rear surface portion of the first heater case; and   a diffuser positioned at the front surface portion of the first heater case and discharging ions generated by the ion generator.   
     
     
         8 . The hairdryer of  claim 1 , further comprising a temperature sensor which is connected to the front board and senses temperature of the gas discharge portion. 
     
     
         9 . The hairdryer of  claim 1 , further comprising an air guide which surrounds an outer circumferential surface of the heater module and guides air having passed through the heater module to the gas discharge portion,
 wherein the air guide comprises an insulation material configured to prevent heat generated by the heater module from being transmitted to the body housing.   
     
     
         10 . The hairdryer of  claim 1 , wherein the heating wire has a shape of a coil which is wound around an outer periphery of the first heater case while defining a plurality of rings, and
 wherein a diameter of one of the plurality of rings of the heating wire is different from a diameter of an adjacent one of the plurality of rings.   
     
     
         11 . The hairdryer of  claim 1 , wherein the heater module is positioned in front of the connecting portion of the handle housing. 
     
     
         12 . The hairdryer of  claim 11 , further comprising:
 a gas introduction port formed in a lower portion of the handle housing; and   a blower fan mounted to the handle housing so as to supply air introduced through the gas introduction port to the heater module of the body housing.