Diffuser

Abstract

Disclosed is a diffuser. The diffuser comprises: a main body configured to be connected to an air duct installed on a ceiling, and comprising an air outlet; a first airflow guide configured to move up and down with respect to the main body to open and close at least a portion of the air outlet, and configured to guide an airflow discharged from the air outlet in response to the air outlet being opened, the first airflow guide comprising an opening configured to allow air to pass through the first airflow guide; and a second airflow guide configured to move up and down with respect to the main body and the first airflow guide to open and close the opening of the first airflow guide, and comprising a downwardly inclined surface configured to guide an airflow discharged from the opening in response to the opening being opened.

What is claimed is: 
     
         1 . A diffuser comprising:
 a main body configured to be connected to an air duct installed on a ceiling, and comprising an air outlet;   a first airflow guide configured to move up and down with respect to the main body to open and close at least a portion of the air outlet, and configured to guide an airflow discharged from the air outlet in response to the air outlet being opened, the first airflow guide comprising an opening configured to allow air to pass through the first airflow guide; and   a second airflow guide configured to move up and down with respect to the main body and the first airflow guide to open and close the opening of the first airflow guide, and comprising a downwardly inclined surface configured to guide an airflow discharged from the opening in response to the opening being opened.   
     
     
         2 . The diffuser of  claim 1 , wherein
 the first airflow guide is configured to guide the airflow, discharged from the air outlet, to a horizontal direction; and   the second airflow guide is configured to guide the airflow, discharged from the opening of the first airflow guide, downward.   
     
     
         3 . The diffuser of  claim 1 , wherein
 in response to the air outlet being opened as the first airflow guide moves down from the main body, and in response to the opening of the first airflow guide being opened as the second airflow guide moves down from the first airflow guide,   a portion of the airflow discharged from the air outlet is guided through a first flow path formed between the air outlet and the first airflow guide; and   another portion of the airflow discharged from the air outlet is guided through a second flow path formed between the opening of the first airflow guide and the downwardly inclined surface.   
     
     
         4 . The diffuser of  claim 1 , wherein
 in response to the air outlet being opened as the first airflow guide moves down from the main body, and in response to the opening of the first airflow guide being closed by the second airflow guide,   the airflow discharged from the air outlet is guided through a flow path formed between the air outlet and the first airflow guide.   
     
     
         5 . The diffuser of  claim 1 , wherein
 in response to the air outlet of the main body being partially closed by the first airflow guide, and in response to the opening of the first airflow guide being opened as the second airflow guide moves down from the first airflow guide,   the airflow discharged from the air outlet is guided through a flow path formed between the opening and the downwardly inclined surface.   
     
     
         6 . The diffuser of  claim 1 , wherein
 the first airflow guide comprises a guide plate surrounding the opening and configured to guide the airflow, discharged from the air outlet of the main body, to a horizontal direction.   
     
     
         7 . The diffuser of  claim 6 , wherein
 the first airflow guide further comprises a first protrusion formed on a lower surface of the guide plate adjacent to the opening and configured to guide the airflow discharged from the opening.   
     
     
         8 . The diffuser of  claim 7 , wherein
 the first airflow guide further comprises a second protrusion formed on an upper surface of the guide plate adjacent to the opening an configured to guide the airflow, discharged from the air outlet of the main body, to the guide plate or the opening.   
     
     
         9 . The diffuser of  claim 1 , wherein
 the second airflow guide comprises:   a rod disposed on an upper part of the downwardly inclined surface and configured to move up and down inside the main body; and   a rib-shaped bridge protruding from an outer peripheral surface of the rod and configured to guide an up and down movement of the airflow discharged from the air outlet of the main body.   
     
     
         10 . The diffuser of  claim 9 , wherein
 the bridge comprises: an inner end provided to be in contact with the rod; and an outer end opposite to the inner end,   wherein as the outer end of the bridge is in contact with an inner peripheral surface of the opening, the second airflow guide is supported by the first airflow guide.   
     
     
         11 . The diffuser of  claim 9 , further comprising:
 a rod support comprising a through-hole through which the rod passes, and provided to be in contact with an inner surface of the main body to allow the rod to be supported inside the main body.   
     
     
         12 . The diffuser of  claim 11 , wherein
 the rod support comprises: a through-hole portion formed in a cylindrical shape and comprising the through-hole; and   a rib protruding from an outer peripheral surface of the through-hole to be in contact the inner surface of the main body and configured to guide an up and down movement of an airflow discharged from the air duct.   
     
     
         13 . The diffuser of  claim 1 , wherein
 the first airflow guide is rotatably coupled to the main body and is configured to move up and down according to a rotational position with respect to the main body to open or close the air outlet of the main body; and   the second airflow guide is detachably coupled to the first airflow guide, and in response to the first airflow guide rotating forward and backward in a state in which the second airflow guide is coupled to the first airflow guide, the second airflow guide is configured to rotate forward and backward to move up and down from the main body.   
     
     
         14 . The diffuser of  claim 1 , further comprising:
 a blocking plate extending along a circumferential direction of the first airflow guide and configured to block a portion of a flow path extending horizontally along an upper surface of the first airflow guide.   
     
     
         15 . The diffuser of  claim 1 , wherein
 the downwardly inclined surface comprises an outer peripheral surface of a cone.   
     
     
         16 . A diffuser comprising:
 a main body configured to be connected to an air duct installed on a ceiling, and including an air outlet;   a first airflow guide configured to move up and down with respect to the main body to open and close at least a portion of the air outlet, and configured to guide an airflow, discharged from the air outlet, to a horizontal direction in response to the air outlet being opened, the first airflow guide including an opening provided to allow air to pass through the first airflow guide; and   a second airflow guide coupled to the first airflow guide configured to move up and down in response to the first airflow guide moving up and down with respect to the main body, and configured to move up and down with respect to the first airflow guide to be separated from the first airflow guide to open and close the opening of the first airflow guide, and configured to guide an airflow, discharged from the opening in response to the opening being opened, downward.   
     
     
         17 . The diffuser of  claim 16 , wherein
 the first airflow guide may include a guide plate configured to guide the airflow, discharged from the air outlet of the main body to the horizontal direction. The guide plate may surround the opening.   
     
     
         18 . The diffuser of  claim 17 , wherein
 the first airflow guide may include a protrusion protruding convexly from upper and lower surfaces of the guide plate adjacent to the opening and configured to guide the airflow discharged from the air outlet and the airflow discharged from the opening.   
     
     
         19 . The diffuser of  claim 18 , wherein
 the second airflow guide may include a cone-shaped downwardly inclined surface configured to guide the airflow, discharged from the opening, downward.   
     
     
         20 . The diffuser of  claim 19 , wherein
 the downwardly inclined surface of the second airflow guide may be coupled to or separated from an inner peripheral surface of the protrusion of the first airflow guide.