Air purifier

Abstract

A humidifying air purifier includes a cabinet having an opening portion formed in an upper portion thereof, and a scroll housing disposed below the opening portion in the cabinet with an air blowing fan disposed in the scroll housing. The scroll housing may include a rounded first guide surrounding a portion of an outer periphery (or circumference) of the air blowing fan; a second guide extending from one end portion of the first guide toward the opening portion; a third guide extending from a cutoff portion formed at the other end portion of the first guide toward the opening portion and inclined in a direction away from the second guide toward the opening portion; and an extension plate extending horizontally from an upper end portion of the third guide in a direction away from the second guide and positioned below the opening portion.

What is claimed is: 
     
         1 . A humidifying air purifier comprising:
 a cabinet, wherein the cabinet includes a pair of side panels, and an upper panel and a rear panel interconnecting the pair of side panels, respectively;   a door assembly coupled to a front of the cabinet and configured and supported to be selectively drawn out of the cabinet and drawn into the cabinet;   an intake formed in the door assembly to allow air to flow through the intake into an inner portion of the cabinet;   a discharge portion positioned on a rear side of the upper panel and from which air is discharged; and   a discharge grill including a plurality of grill guides extending so as to be inclined forward toward an upper end of the discharge grill and covering an upper side of the discharge portion.   
     
     
         2 . The humidifying air purifier according to  claim 1 ,
 wherein the plurality of grill guides are spaced apart from each other in a front to rear direction.   
     
     
         3 . The humidifying air purifier according to  claim 1 ,
 wherein the rear panel includes an upper surface extending forward, and   wherein the discharge portion includes a vertical opening on an upper surface of the rear panel.   
     
     
         4 . The humidifying air purifier according to  claim 1 ,
 wherein an upper surface of the rear panel includes a grill installing groove, and the discharge grill is seated in the grill installing groove with upper ends of the plurality of grill guides being positioned at the same height as an upper end of the upper panel.   
     
     
         5 . The humidifying air purifier according to  claim 1 , further comprising:
 an air blowing fan; and
 a housing cover provided inside the cabinet and having an outer surface surrounding the air blowing fan. 
   
     
     
         6 . The humidifying air purifier according to  claim 5 ,
 wherein the outer surface of the housing cover includes
 a guide plate extending from the housing cover and guiding air passing through the air blowing fan upward in a radial direction; and 
 an extension plate extending laterally along an upper end of the housing cover from an end portion of the guide plate. 
   
     
     
         7 . The humidifying air purifier according to  claim 6 ,
 wherein the extension plate includes a stepped rib configured to support the discharge grill.   
     
     
         8 . The humidifying air purifier according to  claim 5 , wherein the air blowing fan includes an impeller for sucking and discharging air,
 wherein a blade of the impeller includes:
 a maximum camber point defined as a point on a negative pressure surface of the blade corresponding to a point having a maximum camber on an average camber line; and 
 a reference point defined as another point on the negative pressure surface of the blade where the distance between the negative pressure surface and a positive pressure surface is maximum, and 
   wherein the negative pressure surface of the blade includes a linear surface formed as a flat surface from the maximum camber point to a leading edge of the blade.   
     
     
         9 . The humidifying air purifier according to  claim 5 , wherein the housing cover further includes a sensor bracket to which at least one sensor device is mounted. 
     
     
         10 . The humidifying air purifier according to  claim 9 , wherein the sensor bracket is positioned in a recessed space formed by the outer surface of the housing cover. 
     
     
         11 . A humidifying air purifier, comprising:
 a cabinet, the cabinet including a pair of side panels, and an upper panel and a rear panel interconnecting the pair of side panels, respectively;   an opening portion defined on an upper portion of the cabinet and positioned at a rear side of the upper panel;   a scroll housing disposed on a lower side of the opening portion; and an air blowing fan mounted inside the scroll housing,   wherein the scroll housing includes
 a first guide formed to be rounded and surrounding a portion of an outer surface of the air blowing fan; 
 a second guide positioned closer to one side panel of the pair of side panels and extending upward at one end portion of the first guide; and 
 a third guide positioned closer to the other side panel of the pair of side panels and extending upward from the other end portion of the first guide, and 
   wherein a distance between an upper end of the third guide and the other side panel is longer than a distance between an upper end of the second guide and the one side panel.   
     
     
         12 . The humidifying air purifier according to  claim 11 ,
 wherein the third guide extends obliquely in a direction away from the second guide toward the upper portion of the cabinet.   
     
     
         13 . The humidifying air purifier according to  claim 11 ,
 wherein the upper end of the third guide is disposed so as to overlap with the first guide in a downward direction.   
     
     
         14 . The humidifying air purifier according to  claim 11 , wherein the scroll housing further includes an extension plate extending from the upper end of the third guide toward the other side panel. 
     
     
         15 . The humidifying air purifier according to  claim 14 , wherein the opening portion includes:
 a discharge portion communicating with a space between the second guide and the third guide; and   a non-discharge portion facing the extension plate in a downward direction.   
     
     
         16 . A humidifying air purifier comprising:
 a cabinet;
 a door assembly configured and supported to be selectively drawn out of the cabinet and drawn into the cabinet; 
 a fan housing disposed in the cabinet; 
 a fan motor coupled to the fan housing; 
 an air blowing fan coupled with the fan motor; and 
 a housing cover coupled to a rear side of the fan housing and accommodating the air blowing fan, 
 wherein the housing cover includes
 a cover plate forming a rear surface of the housing cover; and 
 a guide plate extending forward along a side end of the cover plate and defining a discharge flow path for air from the air blowing fan, 
 
 the guide plate including
 a first guide extending along a rotation direction of the air blowing fan spaced from the air blowing fan. 
 
   
     
     
         17 . The humidifying air purifier according to  claim 16 ,
 wherein the guide plate further includes:   a second guide extending upward from the first guide; and   a third guide positioned on an opposite side of the second guide from the first guide and extending upwardly from the first guide so as to be inclined relative to the first guide.   
     
     
         18 . The humidifying air purifier according to  claim 17 ,
 wherein the guide plate includes a cutoff portion positioned between the first guide and the third guide, and   wherein the cutoff portion protrudes toward the discharge flow path.   
     
     
         19 . The humidifying air purifier according to  claim 18 ,
 wherein an inner surface of the cutoff portion is formed as a curved surface with a plurality of recessed surface portions and protruding surface portions.   
     
     
         20 . The humidifying air purifier according to  claim 18 ,
 wherein the cutoff portion is rounded with respect to a first direction defined as a direction interconnecting the first guide and the third guide, and   wherein at least a portion of the cutoff portion is rounded with respect to a second direction defined as a direction interconnecting a front end and a rear end of the cutoff portion.