Vacuum suction unit

Abstract

A vacuum suction unit is provided. The vacuum suction unit includes a cover, an impeller, a motor, a guide device which includes a guide body and a guide vane, a flow guide which is disposed below the guide device and guides the air guided by the guide device toward the stator, and a motor housing which accommodates the motor and includes an air outlet. Here, a guide surface at least a part of which has a diameter reduced as getting downward is formed at a bottom surface of the flow guide, the guide vane includes a first guide vane which is provided on a side of the guide body and guides the air ejected from the impeller, and an inlet angle of the first guide vane is within a range from 10 to 25 degrees.

What is claimed is: 
     
         1 . A vacuum suction unit comprising:
 a cover including an air inlet;   an impeller for moving air which flows in through the air inlet;   a motor including a stator and a shaft which is connected to the impeller and rotates with respect to the stator;   a guide device including a guide body disposed below the impeller and a guide vane provided at the guide body to guide air ejected from an outlet of the impeller;   a flow guide disposed below the guide device and guides the air guided by the guide device toward the stator; and   a motor housing accommodating the motor and comprises an air outlet,   wherein a guide surface at least a part of which has a diameter reduced as getting downward is formed at a bottom surface of the flow guide,   wherein the guide vane comprises a first guide vane which is provided on a side of the guide body and guides the air ejected from the impeller, and   wherein an inlet angle of the first guide vane is within a range from 10 to 25 degrees.   
     
     
         2 . The vacuum suction unit of  claim 1 , wherein the guide vane further comprises a second guide vane which is provided at a bottom surface of the guide body, is connected to the first guide vane, and guides the air guided by the first guide vane. 
     
     
         3 . The vacuum suction unit of  claim 1 , wherein the guide surface is formed rounded toward the shaft. 
     
     
         4 . The vacuum suction unit of  claim 1 , wherein an angle of inclination of the guide surface is from 10 to 30 degrees. 
     
     
         5 . The vacuum suction unit of  claim 1 , wherein an inner circumferential surface of the cover is formed in a shape which inclines at a certain angle with respect to a top surface of the guide body. 
     
     
         6 . The vacuum suction unit of  claim 1 , wherein a first flow path is formed between an inner circumferential surface of the cover and the guide body, and the first flow path becomes narrower as getting from the outlet of the impeller closer to a top end portion of the guide vane. 
     
     
         7 . The vacuum suction unit of  claim 6 , further comprising a motor bracket disposed below the guide device and coupled with the cover,
 wherein a second flow path connected to the first flow path is formed between an inner circumferential surface of the motor bracket and the guide body.   
     
     
         8 . The vacuum suction unit of  claim 7 , wherein the cover comprises a first coupling portion coupled with the motor bracket, and the motor bracket comprises a bracket body for forming the second flow path and a second coupling portion provided outside the bracket body and connected with the first coupling portion. 
     
     
         9 . The vacuum suction unit of  claim 8 , wherein a bottom surface of the first coupling portion is located lower than the top end portion of the guide vane. 
     
     
         10 . The vacuum suction unit of  claim 7 , wherein the flow guide is detachably coupled with the motor bracket, and the flow guide comprises a coupling portion connected to the motor bracket.