Air purifier

Abstract

The present application provides an air purifier, which includes: a casing, a fan, a filter, and a formaldehyde removal module; the filter is in a cylindrical shape, and the formaldehyde removal module includes an inner filter, the formaldehyde removal plate is in a honeycomb shape, the inner filter screen cylinder is placed in the filter. The air purifier of the present application provides the formaldehyde removal plate at the bottom of the inner filter screen cylinder to achieve the effect of removing formaldehyde in the air. The formaldehyde removal plate is arranged in a honeycomb shape to reduce the wind resistance of the inner filter and the air resistance, thereby reducing the speed and noise of the fan.

What is claimed is: 
     
         1 . An air purifier, comprising:
 a casing;   a fan, mounted in the casing; and   a filter, mounted in the casing, wherein the casing is provided with air inlet holes at a position adjacent to the filter, and at an end of the casing adjacent to an air outlet end of the fan is provided with an air outlet;   wherein the filter is in a cylindrical shape, the air purifier further comprises a formaldehyde removal module, and the formaldehyde removal module includes an inner filter, the inner filter comprises an inner filter screen cylinder arranged in a cylindrical shape and a formaldehyde removal plate configured for removing formaldehyde in air, the formaldehyde removal plate is mounted at a bottom of the inner filter screen cylinder, and the formaldehyde removal plate is in a honeycomb shape, the inner filter screen cylinder is placed in the filter, and an upper end of the inner filter screen cylinder is fitted and connected with an upper end of the filter.   
     
     
         2 . The air purifier according to  claim 1 , wherein a total area of openings on the formaldehyde removal plate is set as S, an outer diameter of the formaldehyde removal plate is set as W, and a side length of the openings is set as a, and: 
       
         
           
             
               S 
               = 
               
                 
                   3 
                   2 
                 
                 ⁢ 
                 
                   3 
                 
                 ⁢ 
                 
                   a 
                   2 
                 
                 × 
                 
                   
                     [ 
                     
                       1 
                       + 
                       
                         6 
                         × 
                         
                           ( 
                           
                             
                               W 
                               
                                 
                                   3 
                                 
                                 ⁢ 
                                 a 
                               
                             
                             - 
                             1 
                           
                           ) 
                         
                       
                     
                     ] 
                   
                   . 
                 
               
             
           
         
       
     
     
         3 . The air purifier according to  claim 1 , wherein a distance between an outer surface of the inner filter screen cylinder and an inner surface of the filter is set as d, and 6 mm≤d≤9 mm. 
     
     
         4 . The air purifier according to  claim 1 , wherein a height of the filter is set as H1, and a distance from the formaldehyde removal plate to a bottom of the filter is set as H2, and H2≥⅓H1. 
     
     
         5 . The air purifier according to  claim 1 , wherein an area of the formaldehyde removal plate is set as M, and an inner diameter of an air inlet of the fan is set as D, and: 
       
         
           
             
               
                 1.3 
                 × 
                 
                   
                     π 
                     ⁡ 
                     ( 
                     
                       D 
                       2 
                     
                     ) 
                   
                   2 
                 
               
               ≤ 
               M 
               ≤ 
               
                 1.4 
                 × 
                 
                   
                     
                       π 
                       ⁡ 
                       ( 
                       
                         D 
                         2 
                       
                       ) 
                     
                     2 
                   
                   . 
                 
               
             
           
         
       
     
     
         6 . The air purifier according to  claim 1 , wherein the fan comprises a housing, a wind wheel mounted in the housing, and a motor configured for driving the wind wheel to rotate, the housing is mounted in the casing, an inner diameter of an air outlet end of the housing is set as D1, and an outer diameter of the wind wheel is set as D2, and 1.2≤D1/D2≤1.6. 
     
     
         7 . The air purifier according to  claim 6 , wherein the wind wheel comprises a plurality of moving blades, an air inlet guiding ring and a baffle, the baffle is connected to the motor, and the moving blades are connected to the air inlet guiding ring and the baffle; the air inlet guiding ring is bent from an outer circumference of the wind wheel to a direction of a central axis of the wind wheel in a direction away from the baffle; an air inlet end of the housing is extended inwardly to provide with a support plate, the support plate is provided with an air inlet, and an end of the air inlet guiding ring away from the baffle is supported on the support plate. 
     
     
         8 . The air purifier according to  claim 7 , wherein an inner diameter of the air inlet is set as D, and D2-15 mm≤D≤D2-20 mm. 
     
     
         9 . The air purifier according to  claim 1 , wherein the inner filter screen cylinder is a photocatalytic filter screen, and the formaldehyde removal module further comprises a light source configured for illuminating the inner filter screen cylinder, and the light source is mounted in the casing. 
     
     
         10 . The air purifier according to  claim 9 , wherein the light source is an LED module placed above the inner filter screen cylinder. 
     
     
         11 . The air purifier according to  claim 2 , wherein the fan comprises a housing, a wind wheel mounted in the housing, and a motor configured for driving the wind wheel to rotate, the housing is mounted in the casing, an inner diameter of an air outlet end of the housing is set as D1, and an outer diameter of the wind wheel is set as D2, and 1.2≤D1/D2≤1.6. 
     
     
         12 . The air purifier according to  claim 3 , wherein the fan comprises a housing, a wind wheel mounted in the housing, and a motor configured for driving the wind wheel to rotate, the housing is mounted in the casing, an inner diameter of an air outlet end of the housing is set as D1, and an outer diameter of the wind wheel is set as D2, and 1.2≤D1/D2≤1.6. 
     
     
         13 . The air purifier according to  claim 4 , wherein the fan comprises a housing, a wind wheel mounted in the housing, and a motor configured for driving the wind wheel to rotate, the housing is mounted in the casing, an inner diameter of an air outlet end of the housing is set as D1, and an outer diameter of the wind wheel is set as D2, and 1.2≤D1/D2≤1.6. 
     
     
         14 . The air purifier according to  claim 5 , wherein the fan comprises a housing, a wind wheel mounted in the housing, and a motor configured for driving the wind wheel to rotate, the housing is mounted in the casing, an inner diameter of an air outlet end of the housing is set as D1, and an outer diameter of the wind wheel is set as D2, and 1.2≤D1/D2≤1.6. 
     
     
         15 . The air purifier according to  claim 2 , wherein the inner filter screen cylinder is a photocatalytic filter screen, and the formaldehyde removal module further comprises a light source configured for illuminating the inner filter screen cylinder, and the light source is mounted in the casing. 
     
     
         16 . The air purifier according to  claim 3 , wherein the inner filter screen cylinder is a photocatalytic filter screen, and the formaldehyde removal module further comprises a light source configured for illuminating the inner filter screen cylinder, and the light source is mounted in the casing. 
     
     
         17 . The air purifier according to  claim 4 , wherein the inner filter screen cylinder is a photocatalytic filter screen, and the formaldehyde removal module further comprises a light source configured for illuminating the inner filter screen cylinder, and the light source is mounted in the casing. 
     
     
         18 . The air purifier according to  claim 5 , wherein the inner filter screen cylinder is a photocatalytic filter screen, and the formaldehyde removal module further comprises a light source configured for illuminating the inner filter screen cylinder, and the light source is mounted in the casing.