Ventilator

Abstract

A ventilator includes a first casing, a second casing, a fan blade and a flow guider. The second casing is connected to the first casing and forms a flow channel between the first casing and the second casing. The fan blade is disposed between the first casing and the second casing. When the fan blade rotates, an air-flow compression zone and an air-flow decompression zone are formed in the flow channel. The flow guider is formed along a boundary line to the air-flow decompression zone, wherein the boundary line is adjacent to the air-flow compression zone and the air-flow decompression zone. With the ventilator, the air pressure of the ventilator is increased and noise can be controlled.

1 . A ventilator, comprising:
 a first casing;   a second casing connected to the first casing and forming a flow channel between the first casing and the second casing;   a fan blade disposed between the first casing and the second casing, and wherein when the fan blade rotates, an air-flow compression zone and an air-flow decompression zone are formed in the flow channel; and   a flow guider disposed in the flow channel, the flow guider is formed along a boundary line to the air-flow decompression zone, wherein the boundary line is adjacent to the air-flow compression zone and the air-flow decompression zone.   
     
     
         2 . The ventilator according to  claim 1 , wherein an air inlet is further formed on the first casing or the second casing, and the first casing is connected to the second casing correspondingly to form an air outlet. 
     
     
         3 . The ventilator according to  claim 2 , wherein when the fan blade rotates, an air-flow enters the air inlet, passes through the air-flow compression zone and the air-flow decompression zone, and release out from the air outlet. 
     
     
         4 . The ventilator according to  claim 2 , wherein the flow channel further includes an air-flow outlet zone adjacent to the air outlet, and the flow guider ends before the air-flow outlet zone. 
     
     
         5 . The ventilator according to  claim 1 , wherein the flow guider is disposed at the first casing or the second casing. 
     
     
         6 . The ventilator according to  claim 1 , wherein the flow guider is formed by a concave at the first casing or the second casing. 
     
     
         7 . The ventilator according to  claim 1 , wherein the first casing and the flow guider or the second casing and the flow guider are integratedly formed. 
     
     
         8 . The ventilator according to  claim 1 , wherein the material of the first casing, the second casing and the flow guider is metal, plastic or a combination thereof. 
     
     
         9 . The ventilator according to  claim 1 , wherein the flow guider includes a curved surface. 
     
     
         10 . The ventilator according to  claim 1 , wherein a first height is formed between the first casing and the second casing, the flow guider has a second height, and the first height is higher than the second height.