Air Conditioning Unit

Abstract

The present invention provides an air conditioning unit having an indoor unit, the indoor unit including: a casing; a centrifugal fan having a hub, a shroud, and blades disposed therebetween; and an indoor heat exchanger which surrounds the centrifugal fan, the casing containing the centrifugal fan and the indoor heat exchanger. In the indoor unit, the indoor heat exchanger has a planar air inflow surface allowing an inflow of air discharged from an air outlet of the centrifugal fan, the air inflow surface is provided with a rectifying member, the rectifying member includes a support having an insertion portion fixed between fins on the air inflow surface, and a vane having a shape extending from the support toward a direction opposite a rotating direction of the centrifugal fan, the rectifying member configured to block some of the air flowing between the centrifugal fan and the air inflow surface, and an angle formed by the insertion portion and the vane in the plane orthogonal to a rotation axis of the centrifugal fan is set to become parallel to the air inflow from the air outlet to the air inflow surface at least at the hub side to increase a static pressure of the air at upstream and downstream sides of the vane.

What is claimed is: 
     
         1 . An air conditioning unit having an indoor unit,
 the indoor unit comprising:   a casing;   a centrifugal fan having a hub, a shroud, and blades disposed therebetween; and   an indoor heat exchanger which surrounds the centrifugal fan,   the casing containing the centrifugal fan and the indoor heat exchanger,   wherein the indoor heat exchanger has a planar air inflow surface allowing an inflow of air discharged from an air outlet of the centrifugal fan,   the air inflow surface is provided with a rectifying member,   the rectifying member includes a support having an insertion portion fixed between fins on the air inflow surface, and a vane having a shape extending from the support toward a direction opposite a rotating direction of the centrifugal fan, the rectifying member configured to block some of the air flowing between the centrifugal fan and the air inflow surface, and   an angle formed by the insertion portion and the vane in the plane orthogonal to a rotation axis of the centrifugal fan is set to become parallel to the air inflow from the air outlet to the air inflow surface at least at the hub side to increase a static pressure of the air at upstream and downstream sides of the vane.   
     
     
         2 . The air conditioning unit according to  claim 1 ,
 wherein the support and the vane at the shroud side are configured to increase the static pressure of the air flowing in a direction parallel to the air inflow surface.   
     
     
         3 . The air conditioning unit according to  claim 1 ,
 wherein a curve of a rear edge of the blade seen from an outer peripheral side of the centrifugal fan has an inflection point, having a convex part at the hub side, and a concave part at the shroud side in the rotating direction of the centrifugal fan.   
     
     
         4 . The air conditioning unit according to  claim 1 ,
 wherein the angle at the hub side is different from the angle at the shroud side with respect to a height of the inflection point as a boundary.   
     
     
         5 . The air conditioning unit according to  claim 1 ,
 wherein the indoor heat exchanger has a polygonal shape.   
     
     
         6 . The air conditioning unit according to  claim 5 ,
 wherein each of the air inflow surfaces constituting the polygonal shape is provided with each one of the rectifying members, respectively.   
     
     
         7 . The air conditioning unit according to  claim 1 ,
 wherein the support has an opening for flowing some of the air inflow between the vane and the air inflow surface downstream.   
     
     
         8 . The air conditioning unit according to  claim 1 ,
 wherein the end of the vane at the shroud side is positioned closer to the hub side than an air inlet of the shroud.   
     
     
         9 . The air conditioning unit according to  claim 1 ,
 wherein the insertion portion of the support is disposed at an anterior position of a position where a distance between the centrifugal fan and the indoor heat exchanger becomes the shortest in the rotating direction of the centrifugal fan.   
     
     
         10 . The air conditioning unit according to  claim 1 ,
 wherein each of the rectifying members includes a plurality of the insertion portions having the same coordinates in the rotating direction of the centrifugal fan.   
     
     
         11 . The air conditioning unit according to  claim 9 ,
 satisfying a relationship of 0.2 G≦W≦0.5 G, where W denotes a distance between the insertion portion of the support and the position at which the distance between the centrifugal fan and the heat exchanger becomes the shortest on the air inflow surface, and G denotes a distance between an end of the air inflow surface at an anterior position of the position at which the distance between the centrifugal fan and the heat exchanger becomes the shortest in the rotating direction of the centrifugal fan, and the position at which the distance between the centrifugal fan and the heat exchanger becomes the shortest.   
     
     
         12 . The air conditioning unit according to  claim 1 ,
 wherein an angle formed by the insertion portion and the vane at the hub side is different from the angle at the shroud side; and   a vane is disposed between those two vanes at different angles so as to be connected.   
     
     
         13 . The air conditioning unit according to  claim 1 ,
 wherein the angle formed by the insertion portion and the vane at the hub side is equal to or smaller than 135°.   
     
     
         14 . The air conditioning unit according to  claim 13 ,
 wherein the angle formed by the insertion portion and the vane at the shroud side is equal to or smaller than 115°.   
     
     
         15 . The air conditioning unit according to  claim 1 ,
 wherein the support is longer than the vane in the rotation axial direction of the centrifugal fan.