Fan Impeller and Fan Using Fan Impeller

Abstract

The present invention discloses an impeller for a fan, which comprises a plurality of blades (2) and a rear wheel disc (1); the plurality of blades (2) are arranged one by one successively along a circumferential direction of the rear wheel disc (1); an angle α is defined between the first projection line (21a) of each outer edge (21) and a radial line of the rear wheel disc (1) and satisfies the following condition: −60°≤α≤60°; an angle β is defined between the second projection line (22a) of each inner edge (22) and the radial line of the rear wheel disc (1) and satisfies the following condition: 20°≤β≤70°; an angle θ is defined between a first connecting line (L1) and a second connecting line (L2) and satisfies the following condition: 10°≤Θ≤65°. The impeller for a fan is good in aerodynamic performance, high in both fan efficiency and air pressure, and large in gradient of the generated negative pressure.

1 . An impeller for a fan, comprising:
 a plurality of blades, each blade has a top, a bottom, an outer edge, and an inner edge; and   a rear wheel disc with a surface, a periphery, and a center, the plurality of blades mounted on the rear wheel disc, a first projection line being defined on the rear wheel disc and by the outer edge of each blade, a second projection line being defined on the rear wheel disc and by the inner edge of each blade;   wherein   the outer edge of each blade is placed adjacent to the periphery of the rear wheel disc and the inner edge of each blade is adjacent to a center of the rear wheel disc, the bottom of each blade stands on the surface of the rear wheel disc, and the plurality of blades are arranged one by one successively along a circumferential direction of the rear wheel disc;   the outer edge of each blade is an air exit, and an angle α is defined between the first projection line of each outer edge and a radial line of the rear wheel disc and satisfies the following condition: −60°≤α≤60°;   the inner edge of each blade is s an air intake, and an angle β is defined between the second projection line of each inner edge and the radial line of the rear wheel disc and satisfies the following condition: 20°≤β≤70°;   an angle θ is defined between a first connecting line connecting the outer edge of a blade and the center of the rear wheel disc and a second connecting line connecting the inner edge of a blade and the center of the rear wheel disc and satisfies the following condition: 10°≤θ≤65°; and,   a first vertical height h 1  of the top of each outer edge is less than a second vertical height h 2  of the top of each inner edge.   
     
     
         2 . The impeller of  claim 1 , wherein
 the outer edge of each blade is disposed adjacent to the periphery of the rear wheel disc;   the inner edge of each blade is slanted downwardly toward the center of the rear wheel disc;   each blade has a bottom surface all of which are located in a same plane; and, each blade has a smooth top surface.   
     
     
         3 . The impeller of  claim 1 , wherein a ratio of the first vertical height h 1  to the second vertical height h 2  satisfies the following condition: 0.2≤h 1 /h 2 ≤0.8. 
     
     
         4 . The impeller of  claim 3 , wherein
 the angle α satisfies the following condition: −30°≤α≤30°;   the angle β satisfies the following condition: 30°≤β≤60°;   the angle θ satisfies the following condition: 20°≤θ≤45°; and,   the ratio of the first vertical height h 1  to the second vertical height h 2  satisfies the following condition: 0.4≤h 1 /h 2 ≤0.6.   
     
     
         5 . The impeller of  claim 1 , wherein the plurality of blades comprises 10 to 50 blades. 
     
     
         6 . The impeller of  claim 1 , further comprising:
 a front cover covering the plurality of blades;   a first arc segment and a second arc segment that are jointed with each other from inside to outside are formed at an intersection of the front cover with a meridian plane of a rotating shaft of the impeller; and,   a ratio of the radius R 1  of the first arc segment to the radius R 2  of the second arc segment satisfies the following condition: 0.1≤R 1 /R 2 ≤0.6.   
     
     
         7 . The impeller of  claim 6 , wherein
 a linear segment, which is disposed on an outer side of the second arc segment and smoothly jointed with the second arc segment, is formed at the intersection of the front cover with the meridian plane of the rotating shaft of the impeller; and,   a ratio of the length L of the linear segment to the radius R 2  of the second arc segment satisfies the following condition: 0.1≤L/R 2 ≤0.4.   
     
     
         8 . A fan using the impeller of  claim 6 , comprising a volute, a motor and a wind inlet ring;
 wherein   the impeller for the fan is disposed inside the volute;   the rear wheel disc of the impeller for the fan is disposed on an output shaft of the motor; and,   the wind inlet ring is disposed at a wind inlet of the fan and fitted with a front cover of the impeller for the fan.   
     
     
         9 . The fan of  claim 8 , wherein a distance δ between the rear wheel disc and a wall of the volute close to the rear wheel disc satisfies the following condition: 1 mm≤δ≤10 mm. 
     
     
         10 . The fan of  claim 8 , wherein the front cover is covered outside the wind inlet ring, and a vertical distance Δ between a front edge of the front cover and an outside wall of the wind inlet ring satisfies the following condition: 0.5 mm≤Δ≤5 mm.