Noise reduction device for cleaners

Abstract

A noise reduction device according includes: a guide flow path guiding air discharged through an air outlet; a first flow path having a first end communicating with the guide flow path and a second end that is open, the first flow path extending in a first direction; and a second flow path having a first end connected between the first end and the second end of the first flow path and a second end that is closed, the second flow path extending in a second direction intersecting the first direction, wherein the guide flow path overlaps the second flow path in the first direction.

What is claimed is: 
     
         1 . A noise reduction device for use in a cleaner comprising:
 at least one guide flow path that receives air discharged through an air outlet of the cleaner;   a first flow path having a first end that communicates with the guide flow path and a second end that is open, the first flow path extending in a first direction; and   a second flow path having a first end that is fluidly connected to the first flow path between the first end and the second end of the first flow path, and a second end that is closed, the second flow path extending in a second direction intersecting the first direction,   wherein the guide flow path overlaps the second flow path in the first direction.   
     
     
         2 . The noise reduction device of  claim 1 , wherein the at least one guide flow path comprises:
 a first guide flow path that communicates with the air outlet, and has a ring shape around a central axis that extends parallel to the first direction; and   a second guide flow path having a first end that communicates with the first guide flow path and a second end that communicates with the first flow path, the second guide flow path extending in the second direction.   
     
     
         3 . The noise reduction device of  claim 2 , wherein a center of the first flow path overlaps the central axis in the first direction. 
     
     
         4 . The noise reduction device of  claim 1 , wherein the first flow path has a circular cross-sectional shape when viewed in plan. 
     
     
         5 . The noise reduction device of  claim 1 , wherein the second flow path is disposed around a portion of the first flow path. 
     
     
         6 . The noise reduction device of  claim 1 , wherein the second flow path has a ring shape positioned around a center of the first flow path. 
     
     
         7 . The noise reduction device of  claim 1 , further comprising a third flow path having a first end that communicates with the open second end of the first flow path, and having a second end that is open,
 wherein the third flow path extends in the second direction.   
     
     
         8 . The noise reduction device of  claim 1 , wherein the first direction and the second direction are perpendicular to each other. 
     
     
         9 . The noise reduction device of  claim 1 , wherein the first end and the second end of the first flow path have respective different cross-sectional areas. 
     
     
         10 . The noise reduction device of  claim 1 , wherein the first end and the second end of the first flow path have corresponding cross-sectional areas. 
     
     
         11 . The noise reduction device of  claim 4 , wherein a diameter of the first flow path is greater than a width of the second flow path. 
     
     
         12 . The noise reduction device of  claim 6 , wherein the first flow path has a circular shape, and an outer diameter of the second flow path is greater than a diameter of the first flow path. 
     
     
         13 . The noise reduction device of  claim 2 , wherein a thickness of the second guide flow path in the first direction is greater than a thickness of the second flow path in the first direction. 
     
     
         14 . The noise reduction device of  claim 2 , further comprising a third flow path having a first end that communicates with the open second end of the first flow path, and having a second end that is open, the third flow path extending in the second direction,
 wherein a thickness of the third flow path in the first direction is greater than a thickness of the second guide flow path and a thickness of the second flow path in the first direction.   
     
     
         15 . The noise reduction device of  claim 1 , wherein the guide flow path is disposed so as not to overlap the first flow path in the first direction. 
     
     
         16 . The noise reduction device of  claim 1 , further comprising:
 a lower body coupled to the cleaner, a portion of the first flow path being defined between the guide flow path and the lower body; and   an upper body that is coupled to the lower body, the upper body defining another portion of the first flow path, and the second flow path being defined between the lower body and the upper body.   
     
     
         17 . The noise reduction device of  claim 16 , wherein the lower body comprises:
 a lower lateral surface wall that defines a lower space;   a lower top wall that is connected to one end of the lower lateral wall and is positioned over the lower space;   a lower hole that is provided in the lower top wall; and   a lower cover that is positioned to overlap the lower hole in the first direction, and is disposed in the lower space.   
     
     
         18 . The noise reduction device of  claim 17 , wherein a fastener that is configured to be fastened to the cleaner is provided on the lower lateral wall. 
     
     
         19 . The noise reduction device of  claim 17 , wherein the upper body comprises:
 an upper lateral wall defining an upper space;   an upper top wall connected to one end of the upper lateral wall and positioned over the upper space; and   an upper hole provided in the upper top surface.   
     
     
         20 . The noise reduction device of  claim 19 , wherein a portion of the lower lateral wall is inserted into the upper space defined by the upper lateral wall. 
     
     
         21 . The noise reduction device of  claim 20 , wherein the upper lateral wall further comprises an upper ledge that contacts the lower lateral wall to maintain a distance between the lower top wall and the upper top wall. 
     
     
         22 . The noise reduction device of  claim 19 , wherein the upper body further comprises an upper cover that is positioned to cover the upper top wall and the upper hole, and at least one separation wall that is positioned to separate the upper cover and the upper top wall. 
     
     
         23 . The noise reduction device of  claim 22 , wherein the upper body includes a plurality of the separation walls,
 wherein the plurality of separation walls are arranged on a closed curve enclosing the upper hole in the first direction.   
     
     
         24 . The noise reduction device of  claim 19 , wherein a center of the upper hole and a center of the lower hole overlap each other in the first direction. 
     
     
         25 . The noise reduction device of  claim 19 , wherein a diameter of the upper hole corresponds to a diameter of the lower hole. 
     
     
         26 . A noise reduction device for use in a cleaner comprising:
 a lower body having a guide flow path that receives air discharged through an air outlet of the cleaner, the lower body having a lower hole communicating with the guide flow path; and   an upper body that is coupled to the lower body, a second flow path being defined between the lower body and the upper body, and the upper body having an upper hole that communicates with the lower hole and the second flow path,   wherein the guide flow path overlaps the second flow path in the first direction, and the second flow path is disposed so as not to overlap the upper hole and the lower hole in the first direction.   
     
     
         27 . The noise reduction device of  claim 26 , wherein the upper hole and of the lower hole overlap each other in the first direction, and the second flow path is disposed around the upper hole and the lower hole when viewed along the first direction.