Indoor unit and air conditioning device comprising the same

Abstract

To provide an indoor unit that can suppress an increase in pressure loss, and that can reduce ventilation resistance in an air passage. The heat exchanger of the indoor unit includes a first portion and a second portion. In a cross section parallel to an axis of rotation of a centrifugal fan at a point where a distance between an outer edge of the centrifugal fan and an inner edge of the heat exchanger is smallest, an inner edge of the first portion and an inner edge of the second portion are arranged parallel to the axis of rotation, and the inner edge of the first portion is arranged radially outward of the inner edge of the second portion. In the cross section, a horizontal distance L1 is smaller than a horizontal distance L2, and a horizontal distance L3 is greater than a horizontal distance L4.

1 . An indoor unit comprising:
 a casing;   a panel provided on a side of the casing facing a space to be air conditioned, the panel having an inlet port and an outlet port;   a centrifugal fan installed in the casing;   a heat exchanger provided radially outward of the centrifugal fan in the casing; and   a drain pan provided below the heat exchanger in the casing,   a blowing air passage leading to the outlet port being formed between an outer periphery of the drain pan and a wall of the casing,   the heat exchanger including a first portion and a second portion located below the first portion,   in a cross section parallel to an axis of rotation of the centrifugal fan at a point where a distance between an outer edge of the centrifugal fan and an inner edge of the heat exchanger is smallest, an inner edge of the first portion of the heat exchanger and an inner edge of the second portion of the heat exchanger being arranged parallel to the axis of rotation of the centrifugal fan, and the inner edge of the first portion of the heat exchanger being arranged radially outward of the inner edge of the second portion of the heat exchanger,   a distance L1 from an outer edge of the first portion of the heat exchanger to the wall of the casing in a direction perpendicular to the axis of rotation in the cross section being smaller than a distance L2 from the outer edge of the centrifugal fan to the inner edge of the first portion of the heat exchanger in the direction perpendicular to the axis of rotation in the cross section,   a distance L3 from an outer edge of the second portion of the heat exchanger to the wall of the casing in the direction perpendicular to the axis of rotation in the cross section being greater than a distance L4 from the outer edge of the centrifugal fan to the inner edge of the second portion of the heat exchanger in the direction perpendicular to the axis of rotation in the cross section,   the distance L1 being equal to the distance L3,   the distance L2 being greater than the distance L4.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The indoor unit according to  claim 1 , wherein the centrifugal fan comprises:
 a main plate part;   a side plate part arranged below the main plate part; and   a plurality of blades radially arranged between the main plate part and the side plate part,   wherein an outer diameter of each of the blades on a side close to the main plate part is greater than an outer diameter of each of the blades on a side close to the side plate part.   
     
     
         6 . The indoor unit according to  claim 1 , wherein the centrifugal fan comprises:
 a main plate part;   a side plate part arranged below the main plate part; and   a plurality of blades radially arranged between the main plate part and the side plate part,   wherein an upper end of the second portion of the heat exchanger is located lower than the side plate part.   
     
     
         7 . An indoor unit comprising:
 a casing;   a panel provided on a side of the casing facing a space to be air conditioned, the panel having an inlet port and an outlet port;   a centrifugal fan installed in the casing;   a heat exchanger provided radially outward of the centrifugal fan in the casing; and   a drain pan provided below the heat exchanger in the casing,   a blowing air passage leading to the outlet port being formed between an outer periphery of the drain pan and a wall of the casing,   the heat exchanger including a first portion and a second portion located below the first portion,   in a cross section parallel to an axis of rotation of the centrifugal fan at a point where a distance between an outer edge of the centrifugal fan and an inner edge of the heat exchanger is smallest, an inner edge of the first portion of the heat exchanger and an inner edge of the second portion of the heat exchanger being arranged parallel to the axis of rotation of the centrifugal fan,   a distance L1 from an outer edge of the first portion of the heat exchanger to the wall of the casing in a direction perpendicular to the axis of rotation in the cross section being smaller than a distance L3 from an outer edge of the second portion of the heat exchanger to the wall of the casing in the direction perpendicular to the axis of rotation in the cross section,   a distance L2 from the outer edge of the centrifugal fan to the inner edge of the first portion of the heat exchanger in the direction perpendicular to the axis of rotation in the cross section being equal to a distance L4 from the outer edge of the centrifugal fan to the inner edge of the second portion of the heat exchanger in the direction perpendicular to the axis of rotation in the cross section.   
     
     
         8 . An air conditioning device comprising the indoor unit according to  claim 1 .