Air duct assembly, blowing device and electric hair dryer

Abstract

An air duct assembly, a blowing device and an electric hair dryer are provided. A first air inlet and an air outlet are formed in the air duct assembly. The air duct assembly is provided with a first passage, a first diversion passage, a second passage, a second diversion passage and a third passage. Fluid is conveyed to the first diversion passage along a first direction. The fluid entering from the first passage is diverted to a second direction and enabling the fluid to enter the second passage. The second passage is configured for diverting the fluid to the second diversion passage along a second direction. The second diversion passage is configured for diverting the fluid output from the second passage to a third direction and enabling the fluid to enter the third passage. The third passage is configured for diverting the fluid to the air outlet.

What is claimed is: 
     
         1 . An air duct assembly, wherein
 a first air inlet ( 301 ) and an air outlet ( 202 ) are formed in the air duct assembly;   wherein the air duct assembly is provided with a first passage ( 302 ), a first diversion passage ( 106 ), a second passage ( 103 ), a second diversion passage ( 107 ) and a third passage ( 104 );   wherein the first air inlet ( 301 ), the first passage ( 302 ), the first diversion passage ( 106 ), the second passage ( 103 ), the second diversion passage ( 107 ), the third passage ( 104 ) and the air outlet ( 202 ) are sequentially connected;   wherein the first passage ( 302 ) is configured for conveying fluid to the first diversion passage ( 106 ) along a first direction;   wherein the first diversion passage ( 106 ) is configured for diverting the fluid entering from the first passage ( 302 ) to a second direction and enabling the fluid to enter the second passage ( 103 );   wherein the second passage ( 103 ) is configured for diverting the fluid to the second diversion passage ( 107 ) along the second direction;   wherein the second diversion passage ( 107 ) is configured for diverting the fluid output from the second passage ( 103 ) to a third direction and enabling the fluid to enter the third passage ( 104 ); and   wherein the third passage ( 104 ) is configured for diverting the fluid entering the third passage ( 104 ) to the air outlet ( 202 ).   
     
     
         2 . The air duct assembly according to  claim 1 , wherein
 the first direction is opposite to the second direction;   and/or wherein the third direction is opposite to the second direction.   
     
     
         3 . The air duct assembly according to  claim 1 , wherein
 the extension direction of the first direction is intersected with the extension direction of the second direction;   and/or an extension direction of the third direction is intersected with an extension direction of the second direction.   
     
     
         4 . The air duct assembly according to  claim 1 , wherein
 a boundary of a cross section, along an outlet direction, of the first diversion passage ( 106 ) and/or the second diversion passage ( 107 ) is a combination of one or more of an arc, a parabolic curve, a part of an elliptical curve and a hyperbolic curve with a straight line;   or wherein a boundary of a cross section, along an outlet direction, of the first diversion passage ( 106 ) and/or the second diversion passage ( 107 ) is a curve.   
     
     
         5 . An air duct assembly, comprising:
 a first housing ( 1 ), wherein an accommodation cavity ( 101 ) and a first opening ( 102 ) are formed in the first housing ( 1 ), and the accommodation cavity ( 101 ) communicates with the first opening ( 102 );   a second housing ( 2 ), wherein the second housing ( 2 ) is nested in an outer side of the first housing ( 1 ), a second opening ( 201 ) and an air outlet ( 202 ) are formed in two axial ends of the second housing ( 2 ) respectively, and the second opening ( 201 ) and the first opening ( 102 ) have a same open end direction;   a third housing ( 3 ), wherein a first air inlet ( 301 ) is formed in the third housing ( 3 ), the third housing ( 3 ) covers the second opening ( 201 ), the third housing ( 3 ) extends at least partially into the accommodation cavity ( 101 ), wherein a second passage ( 103 ) is formed between an inner side of the first housing ( 1 ) and the third housing ( 3 ), wherein a third passage ( 104 ) is formed between the outer side of the first housing ( 1 ) and the second housing ( 2 ), wherein the second passage ( 103 ) communicates with the third passage ( 104 ) through the first opening ( 102 ) to draw air into the air duct assembly ( 100 ) from the first air inlet ( 301 ) and discharge the air from the air duct assembly ( 100 ) through the air outlet ( 202 ).   
     
     
         6 . The air duct assembly according to  claim 5 , wherein
 the first housing ( 1 ) and the second housing ( 2 ) are integrally formed;   and/or wherein the first housing ( 1 ) and the third housing ( 3 ) are integrally formed;   and/or wherein the second housing ( 2 ) and the third housing ( 3 ) are integrally formed.   
     
     
         7 . The air duct assembly according to  claim 5 , wherein
 one axial end, extending into the first housing ( 1 ), of the third housing ( 3 ) is spaced apart from the first housing ( 1 ) to form a first diversion passage ( 106 ), the third housing ( 3 ) is internally provided with a first passage ( 302 ) communicating with the first air inlet ( 301 ), and the first diversion passage ( 106 ) communicates with the first passage ( 302 ) and the second passage ( 103 ); and   wherein a second diversion passage ( 107 ) is formed between one end, provided with the first opening ( 102 ), of the first housing ( 1 ) and an other axial end of the third housing ( 3 ), and the second diversion passage ( 107 ) communicates the second passage ( 103 ) and the third passage ( 104 ).   
     
     
         8 . The air duct assembly according to  claim 5 , wherein
 the first housing ( 1 ) comprises a first housing body ( 11 ) and a blocking portion ( 12 ), the blocking portion ( 12 ) is arranged at one axial end of the first housing body ( 11 ), the accommodation cavity ( 101 ) is formed between the first housing body ( 11 ) and the blocking portion ( 12 ), the first opening ( 102 ) is formed in an other axial end of the first housing body ( 11 ), the third housing ( 3 ) extending into the accommodation cavity ( 101 ) through the first opening ( 102 ), the first housing ( 1 ) is provided with an inner surface and an outer surface which are arranged relatively inside and outside, the second passage ( 103 ) is formed between an inner surface of the first housing body ( 11 ) and the third housing ( 3 ), and the third passage ( 104 ) is formed between an outer surface of the first housing body ( 11 ) and the second housing ( 2 ); and/or   wherein the second housing ( 2 ) comprises a second housing body ( 21 ) and an air outlet portion ( 22 ), the air outlet portion ( 22 ) is arranged at one axial end of the second housing body ( 21 ), the air outlet ( 202 ) is formed in the air outlet portion ( 22 ), the second opening ( 201 ) is formed in an other axial end of the second housing body ( 21 ), the third housing ( 3 ) covers the second housing body ( 21 ), and the third passage ( 104 ) is formed between the outer side of the first housing ( 1 ) and an inner surface of the second housing body ( 21 ).   
     
     
         9 . The air duct assembly according to  claim 8 , wherein the third housing ( 3 ) comprises a third housing body ( 31 ) and a radial extension portion ( 32 ), the radial extension portion ( 32 ) is arranged at one axial end of the third housing body ( 31 ) and is arranged convexly relative to a surface of the third housing body ( 31 ), the radial extension portion ( 32 ) is nested in the second housing ( 2 ) to block the second opening ( 201 ), the third housing body ( 31 ) forms the first passage ( 302 ) which is penetrated to form the first air inlet ( 301 ) in the one axial end of the third housing body ( 31 ), an other axial end of the third housing body ( 31 ) is nested and inserted in the accommodation cavity ( 101 ), and the second passage ( 103 ) is formed between the third housing body ( 31 ) and the inner side of the first housing ( 1 ). 
     
     
         10 . The air duct assembly according to  claim 9 ,
 further comprising a seal ring ( 4 ), wherein the seal ring ( 4 ) is sleeved on the radial extension portion ( 32 ), the seal ring ( 4 ) is abutted between the radial extension portion ( 32 ) and the second housing ( 2 ) to seal a gap between the radial extension portion ( 32 ) and the second housing ( 2 );   and/or wherein one of the radial extension portion ( 32 ) and the second housing ( 2 ) is provided with a limit rib ( 33 ), and an other of the radial extension portion ( 32 ) and the second housing ( 2 ) is provided with a limit slot ( 203 ), and the limit rib ( 33 ) is adapted with the limit slot ( 203 ); and/or   wherein the first passage ( 302 ) of the third housing body ( 31 ) is configured for installing a fan ( 400 ).   
     
     
         11 . The air duct assembly according to  claim 5 , further comprising a heating assembly ( 5 ), wherein the heating assembly ( 5 ) is installed in the third passage ( 104 ). 
     
     
         12 . The air duct assembly according to  claim 11 , further comprising a mounting bracket, wherein the mounting bracket is arranged on the first housing ( 1 ) or the second housing ( 2 ), the mounting bracket is located in the third passage ( 104 ), and the mounting bracket is configured for mounting the heating assembly ( 5 ). 
     
     
         13 . The air duct assembly according to  claim 12 , wherein
 the mounting bracket comprises a plurality of support members ( 6 ), the heating assembly ( 5 ) is arranged on the plurality of support members ( 6 ), the plurality of support members ( 6 ) are spaced apart along the outer surface of the first housing ( 1 ), the first housing ( 1 ) is provided with necks ( 105 ), each of the plurality of support member ( 6 ) is provided with a convex rib, and at least portion of the convex rib is located in a corresponding one of the necks ( 105 ); and/or   wherein the mounting bracket further comprises a heat insulation member ( 7 ), the heat insulation member ( 7 ) is nested in the second housing ( 2 ), and the heat insulation member ( 7 ) is located between the heating assembly ( 5 ) and the second housing ( 2 ).   
     
     
         14 . A blowing device, comprising:
 an outer housing ( 300 ), wherein a second air inlet ( 3001 ) and a mounting cavity are formed in the outer housing ( 300 );   the air duct assembly ( 100 ) according to  claim 5 , wherein the air duct assembly ( 100 ) is arranged on the outer housing ( 300 ), the air duct assembly ( 100 ) is at least partially located in the mounting cavity; and   a fan ( 400 ), wherein the fan ( 400 ) is arranged on the third housing ( 3 ), the fan ( 400 ) is located in the first passage ( 302 ) of the third housing ( 3 ), and the fan ( 400 ) is configured to draw air into the outer housing ( 300 ) from the second air inlet ( 3001 ) and guide the air along the third housing ( 3 ) before being discharged through the air outlet ( 202 ).   
     
     
         15 . An electric hair dryer, comprising:
 a handle assembly ( 500 ); and   the blowing device according to claim  14 , wherein the handle assembly ( 500 ) is arranged on the blowing device.   
     
     
         16 . The electric hair dryer according to  claim 15 , wherein a hole ( 5001 ) is formed in the blowing device, wherein the hole ( 5001 ) is arranged adjacent to the heating assembly ( 5 ) of the blowing device, a third air inlet ( 5002 ) is formed in the handle assembly ( 500 ), and the third air inlet ( 5002 ) communicates with the hole ( 5001 ). 
     
     
         17 . The blowing device according to  claim 14 , wherein
 the first housing ( 1 ) and the second housing ( 2 ) are integrally formed;   and/or wherein the first housing ( 1 ) and the third housing ( 3 ) are integrally formed;   and/or wherein the second housing ( 2 ) and the third housing ( 3 ) are integrally formed.   
     
     
         18 . The blowing device according to  claim 14 , wherein
 one axial end, extending into the first housing ( 1 ), of the third housing ( 3 ) is spaced apart from the first housing ( 1 ) to form a first diversion passage ( 106 ), the third housing ( 3 ) is internally provided with a first passage ( 302 ) communicating with the first air inlet ( 301 ), and the first diversion passage ( 106 ) communicates with the first passage ( 302 ) and the second passage ( 103 ); and   wherein a second diversion passage ( 107 ) is formed between one end, provided with the first opening ( 102 ), of the first housing ( 1 ) and an other axial end of the third housing ( 3 ), and the second diversion passage ( 107 ) communicates the second passage ( 103 ) and the third passage ( 104 ).   
     
     
         19 . The blowing device according to  claim 14 , wherein
 the first housing ( 1 ) comprises a first housing body ( 11 ) and a blocking portion ( 12 ), the blocking portion ( 12 ) is arranged at one axial end of the first housing body ( 11 ), the accommodation cavity ( 101 ) is formed between the first housing body ( 11 ) and the blocking portion ( 12 ), the first opening ( 102 ) is formed in an other axial end of the first housing body ( 11 ), the third housing ( 3 ) extending into the accommodation cavity ( 101 ) through the first opening ( 102 ), the first housing ( 1 ) is provided with an inner surface and an outer surface which are arranged relatively inside and outside, the second passage ( 103 ) is formed between an inner surface of the first housing body ( 11 ) and the third housing ( 3 ), and the third passage ( 104 ) is formed between an outer surface of the first housing body ( 11 ) and the second housing ( 2 ); and/or   wherein the second housing ( 2 ) comprises a second housing body ( 21 ) and an air outlet portion ( 22 ), the air outlet portion ( 22 ) is arranged at one axial end of the second housing body ( 21 ), the air outlet ( 202 ) is formed in the air outlet portion ( 22 ), the second opening ( 201 ) is formed in an other axial end of the second housing body ( 21 ), the third housing ( 3 ) covers the second housing body ( 21 ), and the third passage ( 104 ) is formed between the outer side of the first housing ( 1 ) and an inner surface of the second housing body ( 21 ).   
     
     
         20 . The blowing device according to  claim 19 , wherein
 wherein the third housing ( 3 ) comprises a third housing body ( 31 ) and a radial extension portion ( 32 ), the radial extension portion ( 32 ) is arranged at one axial end of the third housing body ( 31 ) and is arranged convexly relative to a surface of the third housing body ( 31 ), the radial extension portion ( 32 ) is nested in the second housing ( 2 ) to block the second opening ( 201 ), the third housing body ( 31 ) forms the first passage ( 302 ) which is penetrated to form the first air inlet ( 301 ) in the one axial end of the third housing body ( 31 ), an other axial end of the third housing body ( 31 ) is nested and inserted in the accommodation cavity ( 101 ), and the second passage ( 103 ) is formed between the third housing body ( 31 ) and the inner side of the first housing ( 1 ).