Ceiling-embedded air conditioner

Abstract

A ceiling-embedded air conditioner includes, a casing, a motor including an output shaft protruding downward, the output shaft being driven to rotate about an axis, a main plate fixed to the output shaft and extending radially outward, a turbofan including an impeller, a heat exchanger passed through by air that is sent from the turbofan. And the main plate includes, a tapered portion, a recess formed to be recessed radially inward from the tapered portion, the recess being defined by a cylindrical plate portion extending along the axis, and a disk plate portion extending radially outward from the upper end of the cylindrical plate portion. And an opening is formed in the cylindrical plate portion, the opening penetrates the cylindrical plate portion in the radial direction, and configured such that a circulation flow that exits from the impeller and flows around above the main plate passes through the opening.

1 . A ceiling-embedded air conditioner, comprising:
 a casing including a suction port formed in the center of a lower portion of the casing and an outlet port formed around the suction port;   a motor provided in the casing and including an output shaft protruding downward, the output shaft being driven to rotate about an axis extending in a vertical direction;   a main plate fixed to the output shaft in the casing and extending radially outward of the axis;   a turbofan including an impeller attached to a lower surface of the main plate in the casing at intervals in a circumferential direction, the impeller being configured to send air introduced from the suction port radially outward; and   a heat exchanger provided to surround the turbofan in the casing and passed through by air that is sent from the turbofan and flows toward the outlet port, wherein   the main plate includes   a tapered portion extending to increase in diameter radially outward as advancing upward, and   a recess formed to be recessed radially inward from the tapered portion over the circumferential direction, the recess being defined by a cylindrical plate portion extending along the axis and a disk plate portion extending radially outward from the upper end of the cylindrical plate portion, and   an opening is formed in the cylindrical plate portion, the opening penetrating the cylindrical plate portion in the radial direction, and configured such that a circulation flow that exits from the impeller and flows around above the main plate passes through the opening.   
     
     
         2 . The ceiling-embedded air conditioner according to  claim 1 , wherein
 a plurality of the openings are arranged in the circumferential direction, and   the circumferential end portions of the plurality of the openings adjacent to each other overlap in the vertical direction.   
     
     
         3 . The ceiling-embedded air conditioner according to  claim 1 , wherein
 each of the plurality of the openings has a rectangular shape, the longitudinal direction of the rectangular shape is in the circumferential direction, and   the positions of the plurality of the openings adjacent to each other in the vertical direction are different from each other.   
     
     
         4 . The ceiling-embedded air conditioner according to  claim 2 , wherein
 each of the plurality of the openings has a rectangular shape, the longitudinal direction of the rectangular shape is in the circumferential direction, and   the positions of the plurality of the openings adjacent to each other in the vertical direction are different from each other.   
     
     
         5 . The ceiling-embedded air conditioner according to  claim 1 , wherein
 end edges of the plurality of the openings in the circumferential direction extend in a direction inclined with respect to the axis, and   the end edges of the plurality of the openings adjacent to each other overlap in the vertical direction.   
     
     
         6 . The ceiling-embedded air conditioner according to  claim 2 , wherein
 end edges of the plurality of the openings in the circumferential direction extend in a direction inclined with respect to the axis, and   the end edges of the plurality of the openings adjacent to each other overlap in the vertical direction.   
     
     
         7 . The ceiling-embedded air conditioner according to  claim 1 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.   
     
     
         8 . The ceiling-embedded air conditioner according to  claim 2 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.   
     
     
         9 . The ceiling-embedded air conditioner according to  claim 3 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.   
     
     
         10 . The ceiling-embedded air conditioner according to  claim 4 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.   
     
     
         11 . The ceiling-embedded air conditioner according to  claim 5 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.   
     
     
         12 . The ceiling-embedded air conditioner according to  claim 6 , wherein
 the plurality of the openings are arranged at intervals in the circumferential direction to form a row, a plurality of rows are arranged at intervals in the vertical direction, and   positions of the plurality of the openings in the circumferential direction are different between the plurality of rows adjacent in the vertical direction.