Portable fan

Abstract

A portable bladeless fan is provided and includes: a housing, a mix-flow fan, and a pressurizing member. The housing has an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing. The mix-flow fan is configured to generate an airflow. The pressurizing member is connected to a front portion of the housing and disposed at a front of the mix-flow fan. The pressurizing member includes a pressurizing seat and second blades. The pressurizing seat includes a pressurizing surface that is at least partially increased in a radial direction from the rear side to the front side, the second blades are spaced apart from each other and are arranged on the pressurizing surface. The second blades re-arrange a direction of the airflow and to reduce a noise of the airflow.

What is claimed is: 
     
         1 . A portable bladeless fan, comprising:
 a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing;   a mix-flow fan, arranged inside the housing and configured to rotate about a rotation shaft to generate an airflow;   a pressurizing member, connected to a front portion of the housing and disposed at a front of the mix-flow fan, wherein the pressurizing member comprises a pressurizing seat and a plurality of second blades, the pressurizing seat comprises a pressurizing surface that is at least partially increased in a radial direction from the rear side to the front side, the plurality of the second blades are spaced apart from each other and are arranged on and connected to the pressurizing surface, the plurality of the second blades are connected to the housing, the airflow generated by the mix-flow is capable of being converted into a high-pressure airflow after flowing through the pressurizing surface, the plurality of the second blades are configured to re-arrange a direction of the airflow and to reduce a noise of the airflow to convert a sharp sound into a low sound.   
     
     
         2 . The portable bladeless fan according to  claim 1 , wherein,
 the mix-flow fan comprises a rotation seat and a plurality of first blades;   the rotation seat comprises an airflow guiding surface that is increased in the radial direction from the rear side to the front side, the plurality of the first blades are spaced apart from each other and are arranged on and connected to the airflow guiding surface;   the airflow guiding surface and the pressurizing surface are increased in the radial direction to have a flared shape and to form an outwardly expanding pressurizing ramp, the pressurizing ramp is configured to increase a pressurizing path of the airflow, the pressurizing ramp and the housing are cooperatively configured to convert the sharp sound into the low sound.   
     
     
         3 . The portable bladeless fan according to  claim 2 , wherein,
 the rotation seat and the pressurizing seat are directly adjacent to each other and are spaced apart from each other axially;   the airflow guiding surface and the pressurizing surface are directly adjacent to each other and are spaced apart from each other in an axial direction; and   each of a spacing between the rotation seat and the pressurizing seat in the axial direction and a spacing between the airflow guiding surface and the pressurizing surface in the axial direction is in a range from 1 mm to 4 mm to guide the airflow generated by the mixed-flow fan to flow smoothly to the pressurizing surface and to reduce a noise generated by a turbulent flow.   
     
     
         4 . The portable bladeless fan according to  claim 2 , wherein,
 the rotation seat defines a first chamber having an opening facing to the front side;   the pressurizing seat defines second chamber having an opening facing to the rear side;   the first chamber and the second chamber are at least partially overlapping with each other in the radial direction;   the mix-flow fan comprises a motor received in the first chamber and the second chamber, the opening of the first chamber and the opening of the second chamber face towards and are communicated with each other to shield noise generated by the motor to convert the sharp sound to the low sound.   
     
     
         5 . The portable bladeless fan according to  claim 1 , wherein,
 a cross section of a front portion of the pressurizing seat, taken along the radial direction, has a radius of 21.3 mm to 22 mm; or a cross section of a front portion of the pressurizing seat, taken along the radial direction, has a radius of 28 mm to 35 mm to increase an airflow area without reducing an airflow amount and an air pressure; and   a thickness of the pressurizing seat in a front-rear direction is in a range from 9.5 mm to 14.5 mm.   
     
     
         6 . The portable bladeless fan according to  claim 1 , wherein,
 a front end of the pressurizing member is recessed towards the rear side;   a front cover is arranged at the front end of the pressurizing member, the front cover is recessed towards the rear side to form a negative pressure region to guide a localized airflow, after flowing out of the air outlet portion, to flow attachingly along a front surface of the front cover to compensate the negative pressure region and to reduce turbulence.   
     
     
         7 . A portable bladeless fan, comprising:
 a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing;   a pressurizing member, connected to a front portion of the housing;   a mix-flow fan, arranged inside the housing and connected to a rear of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow;   a booster, arranged inside the housing and surrounding a periphery of the mix-flow fan;   wherein a first channel is formed between the mix-flow fan and the booster, a second channel is formed between the pressurizing member and the housing, the first channel and the second channel cooperatively form a pressurizing conduction channel, the airflow is capable of flowing from the air inlet portion, passing through the pressurizing guiding channel, to reach the fan outlet portion.   
     
     
         8 . The portable bladeless fan according to  claim 7 , wherein,
 the housing comprises a first housing and a second housing connected to the first housing;   the first housing is firstly gradually increased along a radial direction of the air inlet portion from the front side to the rear side and is subsequently increased along the radial direction from the rear side to the front side;   the second housing is gradually decreased along the radial direction from the rear side to the front side; and   the booster is spaced apart from the first housing to absorb the noise generated by rotation of the mix-flow fan.   
     
     
         9 . The portable bladeless fan according to  claim 7 , wherein,
 the mix-flow fan comprises a rotation seat, the rotation seat comprises an airflow guiding surface and a plurality of first blades, the airflow guiding surface is at least partially gradually increased in the radial direction from the rear to the front, the plurality of first blades are arranged on and connected to the airflow guiding surface and are spaced apart from each other;   the pressurizing member comprises a pressurizing seat and a plurality of second blades, the pressurizing seat comprises a pressurizing surface that is at least partially increased in the radial direction from the rear side to the front side, the plurality of the second blades are spaced apart from each other and are arranged on and connected to the pressurizing surface, the plurality of the second blades are connected to the housing; and   the booster comprises a booster surface that faces the mix-flow fan and is at least partially increased in the radial direction from the rear side to the front side.   
     
     
         10 . The portable bladeless fan according to  claim 9 , wherein,
 each of at least a portion of the airflow guiding surface and at least a portion of the pressurizing surface is radially recessed to form a concave surface, at least a portion of the pressurizing surface is radially protruded to form a convex surface; a volume within the pressurized airflow guiding channel is increased to gather the airflow.   
     
     
         11 . The portable bladeless fan according to  claim 9 , wherein, a minimum radial gap between the first blades and the pressurizing surface is maintained within an error range of an equivalent separation distance to prevent the airflow at a front end of the mix-flow from flowing around the minimum radial gap to flow reversely to a rear end of the mix-flow. 
     
     
         12 . The portable bladeless fan according to  claim 7 , wherein
 a front end of the booster is aligned with a front end of the mix-flow fan; or   a front end of the booster is protrudes from a front end of the mix-flow fan.   
     
     
         13 . The portable bladeless fan according to  claim 7 , wherein
 a height of the front end of the booster is in a range from 1.4 mm to 3.7 mm, the front end of the booster and the housing form a stepped shape to guide a high-pressure airflow generated by the mix-flow fan to flow quickly to the pressurizing member.   
     
     
         14 . A portable bladeless fan, comprising:
 a housing, having an air inlet portion at a rear side of the housing and an air outlet portion at a front side of the housing, wherein the air inlet portion and the air outlet portion are fluidly connected with each other inside the housing, and a handle is arranged at a lower side of the housing;   a pressurizing member, comprising a pressurizing seat and a plurality of second blades that are spaced apart from each other and are arranged on and connected to a radial outside of the pressurizing seat, wherein the pressurizing seat defines a first cavity having an opening facing to the rear side, the plurality of the second blades are connected to a front portion of the housing, and one of the plurality of second blades defines a wire-through slot communicating with the first cavity;   a mix-flow fan, arranged inside the housing and connected to a rear side of the pressurizing member, wherein the mix-flow fan is configured to rotate about a rotation shaft to generate an airflow, the mix-flow fan comprises a motor, a rotation seat and a plurality of first blades, the plurality of the first blades are spaced apart from each other and are arranged on a radial outside of the rotation seat, the motor is configured to drive the rotation seat and the plurality of the first blades to rotate, the rotation seat defines a second cavity having an opening facing towards the front side, the motor is received in the first cavity and the second cavity;   a main board, at least partially arranged inside the handle, wherein a wire is arranged to connect the motor to the main board; and the wire extends from the motor, passing through the wire-through slot, to the main board.   
     
     
         15 . The portable bladeless fan according to  claim 14 , wherein,
 the main board has a first side and a second side parallel to the first side, the first side faces toward the rear side, and the second side faces toward the front side;   an end of the wire is connected to the motor, and the other end of the wire is connected to the main board and disposed on the first side.   
     
     
         16 . The portable bladeless fan according to  claim 15 , wherein, a wire ramp is disposed at a rear of the wire-through slot and is configured to limit movement of the wire, two ends of the wire-through slot extend towards the rear side to arrange resisting blocks, the resisting blocks abuts against the wire ramp to limit movement of the wire ramp on a mounting plane. 
     
     
         17 . The portable bladeless fan according to  claim 16 , wherein
 an end of the wire ramp near the motor extends towards the wire-through slot to be arranged with a snap, the snap extends through the wire-through slot to be snapped with the resisting blocks to limit the wire ramp from moving towards the rear side;   an end of the wire ramp away from the drive assembly extends toward the wire-through slot to be arranged with an insertion block, the insertion block is inserted in the wire-through slot.   
     
     
         18 . The portable bladeless fan according to  claim 15 , wherein
 the second side is arranged with a light-emitting member;   the handle defines an opening corresponding to the light-emitting member;   a light guide post is disposed at a side of the wire-through slot away from the motor, an end of the light guide post abuts against the second side, the other end of the light guide post is connected to an inside of the handle, and light emitted by the light-emitting member propagates along the light guide post to be emitted out of the fan through the opening of the handle.   
     
     
         19 . The portable bladeless fan according to  claim 18 , further comprising:
 a booster, disposed inside the housing and surrounds a periphery of the mix-flow fan, wherein the booster is connected to a rear side of the second blades;   wherein, a space is defined between the booster and the light guide post; the wire passes through the wire-through slot and the space between the booster and the light guide post, extends along an outer wall of the booster, and is further electrically connected to the first side.   
     
     
         20 . The portable bladeless fan according to  claim 14 , wherein the portable bladeless fan is a hand-held bladeless fan arranged with a handle or a clamped fan arranged with a clip or a transformable fan arranged with a bendable member for shaping and winding or a desktop fan arranged with a stand, a floor fan arranged with a telescopic stand.