Axial-flow air blower fan blades

Abstract

An axial-flow air blower's fan blades may include a blade portion, and a guide blade portion provided behind the blade portion. The guide blade portion has five guide blades, and the blade portion has a hub and a plurality of blades provided on the hub. The blades and the hub are integrated. There are twelve blades, and an outer circumference defined by the outer edges of the twelve blades has a diameter of 84 mm. The structure is simple and reasonable. The integration of the blades and hub improves concentricity and strength of the blades, increases air volume, and reduces noise. A reasonable number of blades and fan diameter together with a reasonable number of guide blades can improve efficiency and wind speed.

What is claimed is: 
     
         1 . An axial-flow air blower's fan blades, comprising a blade portion, and a guide blade portion provided behind the blade portion, the guide blade portion comprising five guide blades, the blade portion comprising a hub and a plurality of blades provided on the hub, the blades and the hub being integrated, wherein there are twelve blades, and an outer circumference defined by outer edges of the twelve blades has a diameter of 84 mm. 
     
     
         2 . The axial-flow air blower's fan blades according to  claim 1 , wherein the hub has a diameter of 40 mm. 
     
     
         3 . The axial-flow air blower's fan blades according to  claim 1 , wherein the guide blade portion further comprises a central cylinder, one end of each guide blade being fixed to the center cylinder and another end being fixed to an inner wall of an outer cylinder of the axial-flow air blower.