Oblique flow booster fan

Abstract

An oblique flow booster fan includes an impeller having an impeller body and a plurality of blades, each blade spirally extended from top to bottom, two ends of each blade provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge; an air guide assembly including an outer ring, an inner cylinder spaced apart in the outer ring, and air guide vanes evenly connected between the outer ring and the inner cylinder; a motor installed in the inner cylinder and having a rotating shaft connected to the impeller body; and a pressurization volute casing arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing provided with an air inlet, and another end of the outer ring provided with an air outlet. The fan is high wind pressure and low noise.

What is claimed is: 
     
         1 . An oblique flow booster fan, comprising:
 an impeller, comprising an impeller body and a plurality of blades connected to the impeller body, each of the blades spirally extended from a top of the impeller body to a bottom of the impeller body, two ends of each of the blades being provided an upper edge and a lower edge respectively, and the upper edge having a width larger than the lower edge;   an air guide assembly, comprising an outer ring, an inner cylinder spaced apart in the outer ring, and a plurality of air guide vanes evenly connected between the outer ring and the inner cylinder;   a motor, installed in the inner cylinder and having a rotating shaft connected to the impeller body; and   a pressurization volute casing, arranged outside the impeller and connected to the outer ring, one end of the pressurization volute casing being provided with an air inlet, and another end of the outer ring being provided with an air outlet.   
     
     
         2 . The oblique flow booster fan according to  claim 1 , wherein the impeller body is upward extended to form the upper edge that is spiral. 
     
     
         3 . The oblique flow booster fan according to  claim 1 , wherein the impeller has an odd number of the blades. 
     
     
         4 . The oblique flow booster fan according to  claim 1 , further comprising a connecting base fixed at a top of the inner cylinder, the rotating shaft of the motor is protruded from the connecting base and connected to the impeller body. 
     
     
         5 . The oblique flow booster fan according to  claim 1 , wherein a holder is provided inside the inner cylinder for installing the motor. 
     
     
         6 . The oblique flow booster fan according to  claim 1 , wherein the inner cylinder is a frustum shape, and an outer diameter of a top of the inner cylinder is larger than that of a bottom of the inner cylinder, the inner cylinder is higher than the outer ring in an axial direction of the rotating shaft, and each of the air guide vanes are higher than the outer ring in the axial direction of the rotating shaft. 
     
     
         7 . The oblique flow booster fan according to  claim 1 , wherein each of the air guide vanes has a top side and a bottom side oppositely arranged, the top side is connected to the top of the inner cylinder and located above the outer ring, the bottom side is respectively connected to the inner cylinder and the outer ring, and the top side and the bottom side are bent toward each other in an axial direction of the rotating shaft to make each of the air guide vanes have an arc structure. 
     
     
         8 . The oblique flow booster fan according to  claim 1 , wherein the pressurization volute casing has a neck that is recessed inward, and an inner wall of the neck is spaced from the blades. 
     
     
         9 . The oblique flow booster fan according to  claim 1 , wherein the outer ring and the bottom edge of the pressurization volute casing are provided with protrusions and grooves matching with each other, and the protrusions are protruded along a radial direction of the outer ring. 
     
     
         10 . The oblique flow booster fan according to  claim 1 , wherein the pressurization volute casing comprises a first casing and a second casing that are matched with each other, a first fixing part, a second fixing part, an engaging buckle, and a matching block are provided between the first and the second casings, the engaging buckle and the matching block are detachably engaged with each other, the first fixing part and the second fixing part are detachably connected together by a connector.