Air outlet protection structure, outdoor unit of air conditioner and method for designing air outlet protection structure

Abstract

The invention discloses an air outlet protection structure, an outdoor unit of an air conditioner and a method for designing an air outlet protection structure. The air outlet protection structure comprises: a central circular disk ( 10 ); and a radiating rib ( 20 ), extending from an outer edge of the central circular disk ( 10 ) to a direction away from the central circular disk ( 10 ). An included angle between a first side surface ( 21 ) of the radiating rib ( 20 ) and a central axis of the central circular disk ( 10 ) is a, as formula (I). The invention is determined according to the characteristics of a flow field of an air duct, and can reduce the hindering effect of an air outlet protection apparatus on a fluid as far as possible, thereby improving the air output volume of a fan and reducing the noise of the entire outdoor unit of the air conditioner.

1 . An air outlet protection structure, comprising:
 a central circular disk ( 10 ); and   a radiating rib ( 20 ), extending from an outer edge of the central circular disk ( 10 ) to a direction away from the central circular disk ( 10 );   an included angle between a first side surface ( 21 ) of the radiating rib ( 20 ) and a central axis of the central circular disk ( 10 ) is a,   
       
         
           
             
               
                 a 
                 = 
                 
                   
                     Vr 
                     Vz 
                   
                   = 
                   
                     
                       2 
                        
                       π 
                        
                       
                           
                       
                        
                       fl 
                     
                     Vz 
                   
                 
               
               , 
             
           
         
       
       where V r  is a flowing velocity of an airflow in a rotation direction of a blade ( 40 ), V z  is a flowing velocity of the airflow in an axial direction of a blade shaft, l is a distance from a point on the first side surface ( 21 ) of the radiating rib ( 20 ) to the central axis of the central circular disk ( 10 ), and f is a rotation frequency of the blade shaft. 
     
     
         2 . The air outlet protection structure according to  claim 1 , wherein there are a plurality of radiating ribs ( 20 ) which are uniformly arranged along the periphery of the central circular disk ( 10 ), and when the air outlet protection structure is horizontally placed, projections of the radiating ribs ( 20 ) on a horizontal plane are cambered. 
     
     
         3 . The air outlet protection structure according to  claim 1 , further comprising:
 a plurality of circumferential ribs ( 30 ), an interval between every two adjacent circumferential ribs ( 30 ) being increased gradually in the direction away from the central circular disk ( 10 ), and the circumferential ribs ( 30 ) and the radiating ribs ( 20 ) being intersected to form a net structure.   
     
     
         4 . The air outlet protection structure according to  claim 1 , wherein a protrusion ( 22 ) provided in a length direction of the radiating rib ( 20 ) is provided on a side, opposite to the first side surface ( 21 ), of the radiating rib ( 20 ), a protrusion direction of the protrusion ( 22 ) is opposite to a flowing direction of the airflow, and the thickness of the radiating rib ( 20 ) is decreased gradually in a width direction of the radiating rib ( 20 ) from the top of the corresponding protrusion ( 22 ). 
     
     
         5 . An outdoor unit of an air conditioner, comprising a fan ( 100 ), the fan ( 100 ) comprising an air outlet protection structure which refers to an air outlet protection structure according to  claim 1 . 
     
     
         6 . A method for designing an air outlet protection structure, wherein the air outlet protection structure comprises a central circular disk ( 10 ) and a radiating rib ( 20 ) extending from an outer edge of the central circular disk ( 10 ) to a direction away from the central circular disk ( 10 ), an included angle a between a first side surface ( 21 ) of the radiating rib ( 20 ) and a central axis of the central circular disk ( 10 ) is determined by a formula 
       
         
           
             
               
                 a 
                 = 
                 
                   
                     Vr 
                     Vz 
                   
                   = 
                   
                     
                       2 
                        
                       π 
                        
                       
                           
                       
                        
                       fl 
                     
                     Vz 
                   
                 
               
               , 
             
           
         
       
       where V r  is a flowing velocity of an airflow in a rotation direction of a blade ( 40 ), V z  is a flowing velocity of the airflow in an axial direction of a blade shaft, l is a distance from a point on the first side surface ( 21 ) of the radiating rib ( 20 ) to the central axis of the central circular disk ( 10 ), and f is a rotation frequency of the blade shaft. 
     
     
         7 . The method for designing an air outlet protection structure according to  claim 6 , wherein after the included angle a is determined, the method further comprises: a plurality of circumferential ribs ( 30 ) are provided at the periphery of the central circular disk ( 10 ), such that an interval between every two adjacent circumferential ribs ( 30 ) is increased gradually, and the circumferential ribs ( 30 ) and the radiating ribs ( 20 ) are intersected to form a net structure. 
     
     
         8 . The method for designing an air outlet protection structure according to  claim 6 , wherein a protrusion ( 22 ) disposed in a length direction of each radiating rib ( 20 ) is provided on a side, opposite to the first side surface ( 21 ), of the radiating rib ( 20 ), a protrusion direction of the protrusion ( 22 ) is opposite to a flowing direction of the airflow, and the thickness of the radiating rib ( 20 ) is decreased gradually in a width direction of the radiating rib ( 20 ) from the top of the corresponding protrusion ( 22 ). 
     
     
         9 . The method for designing an air outlet protection structure according to  claim 7 , wherein a protrusion ( 22 ) disposed in a length direction of each radiating rib ( 20 ) is provided on a side, opposite to the first side surface ( 21 ), of the radiating rib ( 20 ), a protrusion direction of the protrusion ( 22 ) is opposite to a flowing direction of the airflow, and the thickness of the radiating rib ( 20 ) is decreased gradually in a width direction of the radiating rib ( 20 ) from the top of the corresponding protrusion ( 22 ).