Thin-profile cross-flow fan with air volume gain effect

Abstract

A thin-profile cross-flow fan with air volume gain effect has a thin-profile casing, a cross-flow guide passage, a blade assembly, an auxiliary guide ring portion, an axial magnetic motor and a radial flow-through auxiliary guide portion. When the thin-profile cross-flow fan is operated, the air stream guided from the air inlet can be guided to the air outlet through the circulation space or the auxiliary guide ring portion and radial flow-through the auxiliary guide portion, thus increasing the an flux and volume of the thin-profile cross-flow fan and also improving greatly its gain effect and performance with better applicability and industrial benefits.

1 . A thin-profile cross-flow fan with air volume gain effect comprising:
 a thin-profile casing, made of a hollow casing comprising two end surfaces and a few lateral surfaces, and the height between these two end surfaces is 2.5 mm-10 mm;   a cross-flow guide passage, formed in the hollow thin-profile casing; said cross-flow guide passage comprising a circulation space as well as an air inlet and an air outlet at opposite sides of the lateral surface of the thin-profile casing;   a blade assembly, set into the circulation space of the cross-flow guide passage in a rotatable state; said blade assembly comprising a housing hub with an axle center protruded centrally, a mating portion and multiple blades arranged annularly at interval and incorporated onto the circumferential wall of the hub;   an auxiliary guide ring portion, set into a reducing annular guide space by the circumferential wall of the hub and the mating portion of blades;   an axial magnetic motor, set at inner side of an end surface of the thin-profile casing correspondingly to the hub of the blade assembly, and used to drive the rotation of the blade assembly; said axial magnetic motor comprising a magnetic disc located at top wall of the hub, and a stator assembled at inner side of the end surface of the thin-profile casing; said stator comprising a baseplate, an axle bed protruded on the baseplate and a coil assembly set on the baseplate; of which, said axle bed is used for insertion of the axle center of the blade assembly; and there is an axial spacing between the coil assembly and magnetic disc;   a radial flow-through auxiliary guide portion, formed into a radial guide space by the axial spacing between the coil assembly and magnetic disc;   a tongue portion, protruded laterally at one side of the air outlet;   an inward flange, extended from the tongue portion towards the air inlet curvedly;   of which, the periphery of said radial flow-through auxiliary guide portion is connected with the auxiliary guide ring portion and circulation space to form a flow-through space by overriding the bottom of the circumferential wall of the hub;   when the thin-profile cross-flow fan is operated, air stream guided from air inlet could be guided to air outlet through the circulation space or the auxiliary guide ring portion and radial flow-through auxiliary guide portion, thus increasing the air flux and volume of the thin-profile cross-flow fan.   
     
     
         2 . The structure defined in  claim 1 , wherein the width of said air outlet of the cross-flow guide passage is ¼-½ of said air inlet. 
     
     
         3 . The structure defined in  claim 2 , wherein said air inlet and air outlet of the cross-flow guide passage are arranged at an angle of 90 degree or 180 degree from each other. 
     
     
         4 . The structure defined in  claim 3 , wherein the curvature of the inward flange must be consistent with the peripheral curvature of the blade of the blade assembly. 
     
     
         5 . The structure defined in  claim 4 , wherein an auxiliary air inlet is set onto the lateral surface of the thin-profile casing adjacent to the air inlet, helping to absorb air laterally for an increased air flux. 
     
     
         6 . The structure defined in  claim 5 , wherein one side of the tongue portion is obliquely extended towards the interior of air outlet to form an extended retaining wall; the extended retaining wall and the peripheral flange of the blade of the blade assembly are configured at interval, while the extended retaining wall is of an arced pattern that's mated with the peripheral curvature of the blade of the blade assembly; moreover, one end of the inward flange is smoothly linked with the extended retaining wall. 
     
     
         7 . The structure defined in  claim 6 , wherein said thin-profile cross-flow fan is of a split pattern formed by symmetrical connection of two identical thin-profile casings; said thin-profile casing is provided with said cross-flow guide passage, blade assembly, auxiliary guide ring portion, axial magnetic motor, radial flow-through auxiliary guide portion and inward flange; besides, these two thin-profile casings are abutted by the air outlet and connected by a connecting portion; hence, the air outlet of these two thin-profile casings enables mutual pulling for better air volume gain effect. 
     
     
         8 . The structure defined in  claim 6 , wherein an auxiliary suction inlet is additionally set onto the lateral surface of the thin-profile casing adjacent to the air outlet, helping to absorb air laterally for an increased air flux. 
     
     
         9 . The structure defined in  claim 8 , wherein a chamfered portion is formed at the corner area on the lateral surface of the thin-profile casing between the air inlet and air outlet.