Blower noise reducing device and a blower having same

Abstract

A blower noise reducing device for use in a blower having a blower housing defining a volute, a discharge opening through the blower housing, and a discharge nozzle connected over the discharge opening. The blower noise reducing device comprises a moving air deflecting member having a generally triangular cross-section, a first end representing a base of the generally triangular cross-section, a second end representing an apex of the generally triangular cross-section, a first side for mounting against a wall of the discharge nozzle (at a connecting point between the discharge opening and the discharge nozzle), and a second and opposite side for protruding into the discharge opening and discharge nozzle when the first side is mounted against the wall of the discharge nozzle, thereby reducing noise causing characteristics of air being moved by deflecting such moving air in a predetermined manner.

What is claimed is:  
     
         1 . A blower noise reducing device for use in a blower having a blower housing defining a volute, a discharge opening through the blower housing, and a discharge nozzle connected over the discharge opening, the blower noise reducing device comprising a moving air deflecting member having: 
 a. a generally triangular cross-section;    b. a first end representing a base of said generally triangular cross-section;    c. a second end representing an apex of said generally triangular cross-section;    d. a first side for mounting against a wall of the discharge nozzle (at a connecting point between the discharge opening and the discharge nozzle); and    e. a second and opposite side, said second and opposite protruding into the discharge opening and discharge nozzle when said first side is mounted against the wall of the discharge nozzle for reducing noise causing characteristics of air being moved by the blower by deflecting such moving air in a predetermined manner.    
     
     
         2 . The blower noise reducing device of  claim 1 , wherein said moving air deflecting member includes a heel portion at said first end.  
     
     
         3 . The blower noise reducing device of  claim 1  wherein said first end representing said base of said generally triangular cross-section has an external surface for projecting into the volute.  
     
     
         4 . The blower noise reducing device of  claim 1 , wherein as mounted within the discharge nozzle, said moving air deflecting member comprises a reverse-aerofoil relative to air being discharged through the discharge nozzle.  
     
     
         5 . The blower noise reducing device of  claim 1 , wherein said moving air deflecting member is made of a non-metallic material.  
     
     
         6 . The blower noise reducing device of  claim 1 , wherein said moving air deflecting member is made of a metallic material.  
     
     
         7 . The blower noise reducing device of  claim 2 , wherein said heel portion has a first surface aligned with said base of said triangular cross-section.,  
     
     
         8 . The blower noise reducing device of  claim 2 , wherein said heel portion has a second surface for attaching to a wall of the volute.  
     
     
         9 . An air blower comprising: 
 (a) a housing having walls defining an intake region for incoming air, a discharge region including a discharge opening for discharging air from said housing, and an air path for controllably directing air entering said intake region towards said discharge region;    (b) an air moving assembly including a rotatable impeller assembly mounted within said housing for drawing air into said air path through said intake region, and for accelerating air within said air path towards said discharge region;    (c) a discharge nozzle, mounted over said discharge opening, for directing air being discharged away from said housing; and    (d) a blower noise reducing device comprising a moving air deflecting member having: 
 (i) a generally triangular cross-section;  
 (ii) a first end representing a base of said generally triangular cross-section;  
 (iii) a second end representing an apex of said generally triangular cross-section;  
 (iv) a first side for mounting against a wall of the discharge nozzle (at a connecting point between the discharge opening and the discharge nozzle); and  
 (v) a second and opposite side, said second and opposite protruding into the discharge opening and discharge nozzle when said first side is mounted against the wall of the discharge nozzle for reducing noise causing characteristics of air by deflecting such moving air in a predetermined manner.  
   
     
     
         10 . The air blower of  claim 9 , wherein said moving air deflecting member includes a heel portion at said first end.  
     
     
         11 . The air blower of  claim 9  wherein said first end representing said base of said generally triangular cross-section has an external surface for projecting into the volute.  
     
     
         12 . The air blower of  claim 9 , wherein as mounted within the discharge nozzle, said moving air deflecting member comprises a reverse-aerofoil relative to air being discharged through the discharge nozzle.  
     
     
         13 . The air blower of  claim 9 , wherein said moving air deflecting member is made of a non-metallic material.  
     
     
         14 . The air blower of  claim 9 , wherein said moving air deflecting member is made of a metallic material.  
     
     
         15 . The air blower of  claim 9 , wherein said discharge nozzle is attached tangentially to said blower housing.  
     
     
         16 . The air blower of  claim 9 , wherein said air moving assembly includes drive means for rotating said impeller assembly.  
     
     
         17 . The air blower of  claim 9 , wherein a volume of said air path increases from said intake region to said discharge region.  
     
     
         18 . The air blower of  claim 10 , wherein said heel portion has a first surface aligned with said base of said triangular cross-section.,  
     
     
         19 . The air blower of  claim 10 , wherein said heel portion has a second surface for attaching to a wall of the volute.  
     
     
         20 . An air blower comprising: 
 (a) a housing having a housing wall defining an air path, and an air discharge opening;    (b) a discharge nozzle, mounted over said discharge opening for directing air being discharged away from said housing;    (c) a pinch point formed between said housing wall and said discharge nozzle at said discharge opening;    (d) an air moving assembly including a rotatable impeller assembly mounted within said housing for drawing air into said air path; and    (e) a blower noise reducing device on said pinch point for minimizing air stagnation at said pinch point, said blower noise reducing device including a first surface for protruding into said air path, and a second surface for protruding into said discharge nozzle for minimizing air stagnation within said air path and within said discharge nozzle.