Turbine

Abstract

A turbine includes a top cover, a bottom cover and fans between the top cover and the bottom cover. The fans extend to connect the central shaft and do not overlap with each other in the axial direction. The air sucked in through the central air inlet can swiftly flow along the fans and then be expelled out of the turbine through the circumferential air outlets. Compared with the conventional centrifugal fan, the disclosed turbine can effectively increase the air draft efficiency of the turbine. Compared with the standard turbine, the disclosed turbine is simpler and easier to process, and thus the cost can be significantly reduced.

What is claimed is: 
     
         1 . A turbine, comprising:
 a central shaft;   a top cover;   a bottom cover, matching the top cover;   an air inlet, formed as a hole at a center portion of the top cover;   a plurality of air outlets, circling along a circumference of the top cover and the bottom cover; and   a plurality of fans, mounted between the top cover and the bottom cover, each of the fans being extended outward from the central shaft, wherein individual axial projections of the fans are not overlapped.   
     
     
         2 . The turbine of  claim 1 , wherein each of the fans further includes a curved protrusion extending toward the air inlet in a rotational direction. 
     
     
         3 . The turbine of  claim 2 , wherein the curved protrusion is located within the air inlet. 
     
     
         4 . The turbine of  claim 1 , wherein the turbine further includes a plurality of auxiliary fans, each of the auxiliary fans has a frontal area smaller than that of the fans, and the auxiliary fans and the fans are arranged at intervals. 
     
     
         5 . The turbine of  claim 4 , wherein one inner end of the auxiliary fan is close but not touching the central shaft, and an outer end thereof is flush with an outer rim of the bottom cover, wherein the auxiliary fan is to divide an arc length between two said neighboring fans by a ratio ranged from 1:2 to 1:1 along a counter clockwise direction. 
     
     
         6 . The turbine of  claim 5 , wherein the inner end of the auxiliary fan is located within the axial projection of the air inlet. 
     
     
         7 . The turbine of  claim 4 , wherein the number of the fans is equal to that of the auxiliary fans, and the number is one of 3, 4 and 5. 
     
     
         8 . The turbine of  claim 1 , wherein the fan is originated at the central shaft and extends outward to have one end thereof flush with an outer rim of the bottom cover, and wherein the fans, the top cover, the bottom cover and the central shaft are together to form a plurality of chambers inside the turbine. 
     
     
         9 . The turbine of  claim 1 , wherein the bottom cover further includes a central protrusion connected with the central shaft, and a concave portion is formed as a part of the bottom cover extended from the central protrusion to a lower outer end of the bottom cover. 
     
     
         10 . The turbine of  claim 1 , wherein the turbine is a product of molding.