Hair dryer

Abstract

A hair dryer has a casing, a switch, a blower, a mounting cylinder and a heating coil. The casing is hollow and has at least one air inlet and an air outlet. The switch is mounted on the casing. The blower is mounted in the casing and connects to the switch. The mounting cylinder is heat-resistant and insulating and is mounted in the casing. The heating coil having at least one first segment and at least one second segment is mounted around the mounting cylinder, wherein the two segments are wrapped in different directions. When the hair dryer is activated, magnetic fields resulted from the electrified heating coil and the motor tend to partially cancel each other. Therefore, the electromagnetic energy near the air outlet is reduced.

1 . A hair dryer comprising:
 a casing being hollow and having a barrel formed on the casing and having a passage defined in the barrel, a cavity defined in the casing and communicating with the passage, at least one air inlet and an air outlet defined in the casing and communicating with the cavity;   a switch mounted on the casing;   a blower mounted in the cavity in the casing and having a motor mounted in the cavity and connecting to the switch and a fan connected rotatably to the motor; and   a mounting cylinder being heat-resistant and insulating and mounted in the passage; and   a heating coil wrapped spirally around the mounting cylinder and having
 at least one first coil segment wrapped in a clockwise direction; and 
 at least one second coil segment wrapped in a counterclockwise direction; 
   when the motor and the heating coil are electrified to generate magnetic fields respectively, the magnetic fields of the heating coil and the motor partially cancel each other to reduce electromagnetic energy near the air outlet.   
   
   
       2 . The hair dryer as claimed in  claim 1 , wherein the at least one second coil segment is formed integrally with the first coil segment and connected in series. 
   
   
       3 . The hair dryer as claimed in  claim 1 , wherein the at least one first coil segment is separated from the at least one second coil segment.