Fan and cleaning device with same

Abstract

A fan and a cleaning device are provided. The fan has a housing assembly, a fan cover, a wind wheel, and a first diffuser. The fan cover is mounted on the housing assembly and fits with the housing assembly to form an accommodating cavity. The wind wheel is provided in the accommodating cavity and fits with a side wall of the accommodating cavity to form an air inlet channel. The first diffuser is provided in the accommodating cavity, and has first fan blades and a mounting hub. The mounting hub, the first fan blades and the side wall of the accommodating cavity together provide a first diffusion channel. The air inlet channel is in communication with the first diffusion channel in series.

What is claimed is: 
     
         1 . A fan comprising:
 a housing assembly;   a fan cover mounted on the housing assembly, wherein the fan cover is fitted with the housing assembly to form an accommodating cavity;   a wind wheel arranged in the accommodating cavity, wherein the wind wheel is fitted with a side wall of the accommodating cavity to define an air inlet channel; and   a first diffuser, arranged in the accommodating cavity and comprising a plurality of first fan blades and a mounting hub,   wherein the mounting hub, the plurality of first fan blades and the side wall of the accommodating cavity fit to define a first diffusing channel;   the air inlet channel and the first diffusing channel are communicated in sequence;   the plurality of first fan blades are arranged on an outer edge of the mounting hub, along an airflow direction; and   each of the plurality of first fan blades has a front edge, the end of the front edge of the first fan blade connected to the mounting hub is a first end, the end of the front edge of the first fan blade away from the mounting hub is a second end, and the second end is closer to the air inlet channel than the first end along an axial direction of the mounting hub.   
     
     
         2 . The fan of  claim 1 , wherein a connection line between the first end and the second end is defined as a first connection line, and an included angle between the first connection line and a radial line of the mounting hub is defined as a, which satisfies: 25°≤a≤70°. 
     
     
         3 . The fan of  claim 1 , wherein the wind wheel comprises a plurality of second fan blades, and a width of each of the plurality of second fan blades gradually decreases along an axial direction of the wind wheel. 
     
     
         4 . The fan of  claim 3 , wherein a ratio of a maximum width of each second fan blade to a minimum width of the second fan blade is x, which satisfies: 1.3≤x≤2.1. 
     
     
         5 . The fan of  claim 3 , wherein each second fan blade has a clearance fit with an inner wall of the fan cover, and a distance between the second fan blade and the inner wall of the fan cover is d, which satisfies: 0.12≤d≤0.5 mm. 
     
     
         6 . The fan of  claim 3 , wherein the number of the plurality of second fan blades is z2, and the number of the plurality of first fan blades is z1, satisfying: z2<z1, and 7≤z2≤9. 
     
     
         7 . The fan of  claim 1 , wherein:
 the housing assembly is further provided with a second diffuser, the second diffuser comprising an inner cylinder, an outer cylinder, and a plurality of third fan blades;   the inner cylinder is docked with the mounting hub, the plurality of third fan blades are circumferentially distributed on the outer periphery of the inner cylinder, a second diffusing channel is defined among the inner cylinder, the outer cylinder and the plurality of third fan blades; and   the air inlet channel, the first diffusing channel and the second diffusing channel are communicated in sequence.   
     
     
         8 . The fan of  claim 7 , wherein along an axial direction of the second diffuser, a distance between a tail end of each of the plurality of third fan blade and a tail end of the inner cylinder is H1, and a distance between the tail end of each of the plurality of third fan blades and a tail end of the outer cylinder is H2, satisfying: H2>H1. 
     
     
         9 . The fan of  claim 7 , wherein the number of the third fan blades is z3, and the number of the first fan blades is z1, satisfying: z3>z1. 
     
     
         10 . The fan of  claim 7 , wherein along an axial direction of the first diffuser, an axial length of the air inlet channel is h1, an axial length of the first diffusing channel is h2, and an axial length of the second diffusing channel is h3, satisfying: h1≥h2≥h3. 
     
     
         11 . A cleaning device comprising the fan of  claim 1 .