Hair dryer

Abstract

A hair dryer provides a multi-stage air current feed device to accelerate the flow velocity of the air current in the hair dryer such that the motor and the fans may generate least noise while the hair dryer is in operation. In addition to multiple stages of the air current feed device, a further added acceleration can be performed by way of applying the Bernoulli's law and the Venturi. Furthermore, a conventional hair dryer also can reduce the noise thereof without lower down the original high flow velocity and the flow rate thereof by way of applying the Bernoulli's law and the Venturi.

What is claimed is:  
     
         1 . A hair dryer, comprising: 
 a casing with a front end a rear end; and    an air current feed device, being disposed in the casing next to the rear end thereof, and further comprising 
 a motor, being fixedly attached to the casing;  
 a plurality of fan blade assemblies, being arranged coaxially, and being driven by the motor.  
   
     
     
         2 . The hair dryer according to  claim 1 , wherein the motor has a central shaft extending axially toward the front end and rear end of the motor respectively and the fan blade assemblies are fixed the rotational shaft respectively.  
     
     
         3 . The hair dryer according to  claim 1 , wherein first one of the fan blade assemblies is nearest the front end of the casing and a turbulent part is located between the first fan blade assembly and the front end of the casing.  
     
     
         4 . The hair dryer according to  claim 1 , wherein the air current feed device further comprises an axial shaft for being attached with the fan blade assemblies and the axial shaft is driven by the motor via a plurality of transmission parts.  
     
     
         5 . The hair dryer according to  claim 4 , wherein a further turbulent part is fixed to the axial shaft between a second and a third ones of the fan blade assemblies.  
     
     
         6 . The hair dryer according to  claim 1 , wherein the casing is provided with at least a throat tube part corresponding to the fan blade assemblies.  
     
     
         7 . A hair dryer, comprising: 
 a casing with a front end; and    a blade wheel, being disposed in the casing;    characterized in that a lateral side of the blade wheel provides a turbulent part fixedly attached to the casing.    
     
     
         8 . The hair dryer according to  claim 7 , wherein the casing is provided with at least a throat tube part behind the turbulent part.  
     
     
         9 . The hair dryer according to according to  claim 1 , wherein the head end of the casing fits with a muffle mask.  
     
     
         10 . The hair dryer according to according to  claim 7 , wherein the front end of the casing fits with a muffle mask.