Fan and air conditioner

Abstract

A fan includes a plate a plate having a discoidal shape, an annular ring portion having an annular ring shape, and a blade located between the plate and the annular ring portion. The plate is configured to rotate about an axis. The annular ring portion is located apart from the plate in an axial direction of the axis. The blade has one end in the axial direction of the axis joined to the plate, and an other end in the axial direction joined to the annular ring portion. Part of the blade is a porous portion. A joint portion between the blade and the plate or a joint portion between the blade and the annular ring portion is a non-porous portion.

1 . A fan comprising: 
 a plate having a discoidal shape, the plate being configured to rotate about an axis;   an annular ring portion having an annular ring shape, the annular ring portion being located apart from the plate in an axial direction of the axis; and   a blade located between the plate and the annular ring portion, the blade having    one end in the axial direction of the axis joined to the plate and    an other end in the axial direction joined to the annular ring portion,   part of the blade being a porous portion,   a joint portion between the blade and the plate or a joint portion between the blade and the annular ring portion being a non-porous portion.   
     
     
         2 . The fan of  claim 1 , wherein 
       the porous portion is located at a separation portion where airflow separation along the blade occurs. 
     
     
         3 . The fan of  claim 1 , wherein 
       the porous portion includes a leading edge of the blade. 
     
     
         4 . The fan of  claim 2 , wherein 
       the joint portion between the blade and the plate is an entirety of the one end of the blade, 
       the joint portion between the blade and the annular ring portion is a portion of the blade at a trailing edge and the other end, and 
       a dimension from the plate to the other end of the blade is defined as a blade height and a dimension from the leading edge to the trailing edge of the blade is defined as a blade chord length, and the porous portion is located in a region that is 
       90% or less of the blade height, and 
       90% or less of the blade chord length from the leading edge. 
     
     
         5 . The fan of  claim 4 , wherein 
       a length from the leading edge to an end of the porous portion closer to the trailing edge in a direction perpendicular to the axial direction is longer at a portion closer to the other end than at a portion closer to the one end. 
     
     
         6 . The fan of  claim 4 , wherein 
       the porous portion is located in a region defined by connecting a first vertex, a second vertex, and a third vertex by straight lines or curves, the first vertex being a point of the blade at the other end and at the leading edge, the second vertex being a point at 90% of the blade height from the first vertex, the third vertex being a point at 90% of the blade chord length from the first vertex, as viewed from a rotational direction about the axis. 
     
     
         7 . The fan of  claim 1 , wherein 
       the fan is a centrifugal fan. 
     
     
         8 . An air conditioner including the fan of  claim 1 . 
     
     
         9 . The fan of  claim 3 , wherein 
       the joint portion between the blade and the plate is an entirety of the one end of the blade, 
       the joint portion between the blade and the annular ring portion is a portion of the blade at a trailing edge and the other end, and 
       a dimension from the plate to the other end of the blade is defined as a blade height and a dimension from the leading edge to the trailing edge of the blade is defined as a blade chord length, and the porous portion is located in a region that is  
       90% or less of the blade height, and  
       90% or less of the blade chord length from the leading edge. 
     
     
         10 . The fan of  claim 9 , wherein 
       a length from the leading edge to an end of the porous portion closer to the trailing edge in a direction perpendicular to the axial direction is longer at a portion closer to the other end than at a portion closer to the one end. 
     
     
         11 . The fan of  claim 5 , wherein 
       the porous portion is located in a region defined by connecting a first vertex, a second vertex, and a third vertex by straight lines or curves, the first vertex being a point of the blade at the other end and at the leading edge, the second vertex being a point at 90% of the blade height from the first vertex, the third vertex being a point at 90% of the blade chord length from the first vertex, as viewed from a rotational direction about the axis. 
     
     
         12 . The fan of  claim 9 , wherein 
       the porous portion is located in a region defined by connecting a first vertex, a second vertex, and a third vertex by straight lines or curves, the first vertex being a point of the blade at the other end and at the leading edge, the second vertex being a point at 90% of the blade height from the first vertex, the third vertex being a point at 90% of the blade chord length from the first vertex, as viewed from a rotational direction about the axis. 
     
     
         13 . The fan of  claim 10 , wherein 
       the porous portion is located in a region defined by connecting a first vertex, a second vertex, and a third vertex by straight lines or curves, the first vertex being a point of the blade at the other end and at the leading edge, the second vertex being a point at 90% of the blade height from the first vertex, the third vertex being a point at 90% of the blade chord length from the first vertex, as viewed from a rotational direction about the axis.