Blowing device

Abstract

Disclosed herein is a blowing device for small-sized electronic appliances such as cleaning apparatuses. The blowing device comprises a housing, a centrifugal impeller, a guide vane, and a motor for rotating the centrifugal impeller. The centrifugal impeller comprises a shroud, a hub, and a plurality of impeller blades which have an average diameter 87˜93% of a diameter of the housing. The shroud and the hub of the centrifugal impeller, and the guide vane are optimally designed with respect to a size of the housing or an average diameter of the impeller blades, maximizing fan efficiency and heat dissipation of the motor.

1 . A blowing device, comprising: a housing having an intake port and a discharge port, a shroud rotatably equipped within the housing and having an inlet communicated with the intake port of the housing, a hub separated from the shroud in an axial direction while being connected to a motor, and a plurality of impeller blades radially disposed between the hub and the shroud, wherein, when outer diameters of the impeller blades refer to diameters of circles defined by connecting distal ends of the plurality of impeller blades, and an average diameter of the impeller blades refers to an average of the outer diameters of the impeller blades in the axial direction, the impeller blades have the average diameter in the range of 87˜93% of a diameter of the housing.  
     
     
         2 . The blowing device as set forth in  claim 1 , wherein each impeller blade has a distal end perpendicular to the axial direction.  
     
     
         3 . The blowing device as set forth in  claim 1 , wherein each impeller blade has a distal end slanted such that the outer diameter of the impeller blade is gradually decreased from the shroud to the hub.  
     
     
         4 . The blowing device as set forth in  claim 1 , wherein the shroud has an outer diameter in the range of 103˜106% of the average diameter of the impeller blades.  
     
     
         5 . The blowing device as set forth in  claim 1 , wherein the hub has an outer diameter in the range of 95˜98% of the average diameter of the impeller blades.  
     
     
         6 . The blowing device as set forth in  claim 1 , wherein an axial distance between a distal end of the shroud and a distal end of the hub is in the range of 25˜50% of an axial height of the housing.  
     
     
         7 . The blowing device as set forth in  claim 1 , further comprising: a guide vane including a guide vane plate opposite to the hub, and a plurality of guide vane blades radially disposed to the guide vane plate, wherein, when an outer diameter of the guide vane blades refers to a diameter of a circle defined by connecting distal ends of the guide vane blades, the guide vane blades have the outer diameter in the range of 103˜108% of the average diameter of the impeller blades.  
     
     
         8 . The blowing device as set forth in  claim 7 , wherein the guide vane plate has an outer diameter in the range of 100˜102% of the average diameter of the impeller blades.  
     
     
         9 . The blowing device as set forth in  claim 7 , wherein the guide vane has an axial height in the range of 100˜110% of the axial distance between the distal end of the shroud and the distal end of the hub.  
     
     
         10 . The blowing device as set forth in  claim 1 , further comprising: a guide vane including a guide vane plate opposite to the hub, and a plurality of guide vane blades radially disposed to the guide vane plate, wherein, when an outer diameter of the guide vane blades refers to a diameter of a circle defined by connecting distal ends of the guide vane blades, the guide vane plate has an outer diameter in the range of 100˜102% of the average diameter of the impeller blades, the guide vane blades have the outer diameter in the range of 103˜108% of the average diameter of the impeller blades, and the guide vane has an axial height in the range of 100˜110% of the axial distance between the distal end of the shroud and the distal end of the hub.  
     
     
         11 . The blowing device as set forth in  claim 10 , wherein each impeller blade has a distal end perpendicular to the axial direction.  
     
     
         12 . The blowing device as set forth in  claim 10 , wherein each impeller blade has a distal end slanted such that the outer diameter of the impeller blade is gradually decreased from the shroud to the hub.  
     
     
         13 . A blowing device, comprising: a housing having an intake port and a discharge port, a shroud rotatably equipped within the housing and having an inlet communicated with the intake port of the housing, a hub separated from the shroud in an axial direction while being connected to a motor, and a plurality of impeller blades radially disposed between the hub and the shroud, wherein when outer diameters of the impeller blades refer to diameters of circles defined by connecting distal ends of the plurality of impeller blades, and an average diameter of the impeller blades refers to an average of the outer diameters of the impeller blades in the axial direction, the impeller blades have the average diameter in the range of 87˜93% of a diameter of the housing, the shroud has an outer diameter in the range of 103˜106% of the average diameter of the impeller blades, the hub has an outer diameter in the range of 95˜98% of the average diameter of the impeller blades, and an axial distance between a distal end of the shroud and a distal end of the hub is in the range of 25˜50% of an axial height of the housing.  
     
     
         14 . The blowing device as set forth in  claim 13 , wherein each impeller blade has a distal end perpendicular to the axial direction.  
     
     
         15 . The blowing device as set forth in  claim 13 , wherein each impeller blade has a distal end slanted such that the outer diameter of the impeller blade is gradually decreased from the shroud to the hub.  
     
     
         16 . The blowing device as set forth in  claim 13 , further comprising: a guide vane including a guide vane plate opposite to the hub, and a plurality of guide vane blades radially disposed to the guide vane plate, wherein the guide vane plate has an outer diameter in the range of 100˜102% of the average diameter of the impeller blades.  
     
     
         17 . The blowing device as set forth in  claim 13 , further comprising: a guide vane including a guide vane plate opposite to the hub, and a plurality of guide vane blades radially disposed to the guide vane plate, wherein, when an outer diameter of the guide vane blades refers to an outer diameter of a circle defined by connecting distal ends of the plurality of guide vane blades, the guide vane blades have the outer diameter in the range of 103˜108% of the average diameter of the impeller blades.  
     
     
         18 . The blowing device as set forth in  claim 13 , further comprising: a guide vane including a guide vane plate opposite to the hub, and a plurality of guide vane blades radially disposed to the guide vane plate, wherein, when an outer diameter of the guide vane blades refers to a diameter of a circle defined by connecting distal ends of the guide vane blades, the guide vane plate has an outer diameter in the range of 100˜102% of the average diameter of the impeller blades, the guide vane blades have the outer diameter in the range of 103˜108% of the average diameter of the impeller blades, and the guide vane has an axial height in the range of 100˜110% of the axial distance between the distal end of the shroud and the distal end of the hub.  
     
     
         19 . The blowing device as set forth in  claim 18 , wherein each impeller blade has a distal end perpendicular to the axial direction.  
     
     
         20 . The blowing device as set forth in  claim 18 , wherein each impeller blade has a distal end slanted such that the outer diameter of the impeller blade is gradually decreased from the shroud to the hub.  
     
     
         21 . A blowing device comprises: a housing having an intake port and a discharge port, a shroud rotatably equipped within the housing and having an inlet communicated with the intake port of the housing, a hub separated from the shroud in an axial direction while being connected to the motor, and a plurality of impeller blades radially disposed between the hub and the shroud, wherein the impeller blades have an average diameter smaller than a diameter of the shroud, when outer diameters of the impeller blades refer to diameters of circles defined by connecting distal ends of the plurality of impeller blades, and the average diameter of the impeller blades refers to an average of the outer diameters of the impeller blades in an axial direction.  
     
     
         22 . The blowing device as set forth in  claim 21 , wherein the hub has a diameter smaller than the average diameter of the impeller blades.