Diffuser module and electric blower having the same

Abstract

Disclosed herein is a diffuser module, including: a cover covering an impeller connected to a rotation shaft; a housing coupled with the cover and accommodating a driving module including the rotation shaft; a diffuser directing flow of air drawn by the impeller; and a coupling member coupling the cover and the housing, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.

What is claimed is: 
     
         1 . A diffuser module, comprising:
 a cover covering an impeller connected to a rotation shaft;   a housing coupled with the cover and accommodating a driving module including the rotation shaft;   a diffuser directing flow of air drawn by the impeller; and   a coupling member coupling the cover and the housing,   wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.   
     
     
         2 . The module as set forth in  claim 1 , wherein the diffuser includes:
 a guide having a cylindrical shape at the outer circumferential portion; and   a guide vane connected to the guide and directing the air drawn by the impeller,   wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.   
     
     
         3 . The module as set forth in  claim 2 , wherein the coupling portion of the cover inserted into the groove portion of the guide is located as a surface of an inner circumferential portion of the guide. 
     
     
         4 . The module as set forth in  claim 1 , further comprising a front coupled with the diffuser,
 wherein the diffuser further includes a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser.   
     
     
         5 . The module as set forth in  claim 4 , wherein the front further includes a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front. 
     
     
         6 . The module as set forth in  claim 1 , wherein the coupling portion of the cover is formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing is formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member is inserted into a coupling bore of the cover and coupled with the coupling groove of the housing. 
     
     
         7 . The module as set forth in  claim 1 , wherein the cover further includes an assembly guide part formed as a protrusion or a groove, and the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover. 
     
     
         8 . The module as set forth in  claim 1 , wherein the coupling portion of the housing protrudes in the shaft direction toward the cover and protrudes inwardly of the housing. 
     
     
         9 . An electric blower, comprising:
 an impeller having blades for drawing air from the outside;   a diffuser directing flow of the air drawn by the impeller;   a cover covering the impeller and the diffuser;   a driving module including a rotation shaft connected to the impeller;   a front coupled with the diffuser and having a bearing inserted therein for rotatably supporting the rotation shaft;   a housing accommodating the driving module and coupled with the cover; and   coupling members, one of which coupling the cover and the housing, and another of which coupling the diffuser and the front,   wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.   
     
     
         10 . The blower as set forth in  claim 9 , wherein the driving module includes:
 the rotation shaft connected to the impeller and rotating the impeller;   a magnet provided on an outer circumferential surface of the rotation shaft;   an armature facing the magnet and including a stator core and a coil; and   a bearing rotatably supporting the rotation shaft.   
     
     
         11 . The blower as set forth in  claim 9 , wherein the diffuser includes:
 a guide having a cylindrical shape at the outer circumferential portion; and   a guide vane connected to the guide and directing the air drawn by the impeller,   wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.   
     
     
         12 . The blower as set forth in  claim 11 , wherein the coupling portion of the cover inserted into the groove portion of the guide is located as a surface of an inner circumferential portion of the guide. 
     
     
         13 . The blower as set forth in  claim 9 , wherein the diffuser further includes a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser. 
     
     
         14 . The blower as set forth in  claim 13 , wherein the front further includes a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, and wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front. 
     
     
         15 . The blower as set forth in  claim 9 , wherein the coupling portion of the cover is formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing is formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member is inserted into a coupling bore of the cover and coupled with the coupling groove of the housing. 
     
     
         16 . The blower as set forth in  claim 9 , wherein the cover further includes an assembly guide part formed as a protrusion or a groove, and the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover. 
     
     
         17 . The blower as set forth in  claim 9 , wherein the coupling portion of the housing protrudes in the shaft direction toward the cover and protrudes inwardly of the housing. 
     
     
         18 . The blower as set forth in  claim 9 , wherein the housing has a stator core coupling portion formed therein and further includes a coupling member coupled with the stator core coupling portion, wherein an upper end of the stator core is supported by the coupling member. 
     
     
         19 . The blower as set forth in  claim 18 , wherein the stator core has a coupling protrusion portion formed thereon, and
 wherein the housing further includes a stator-core-insertion supporting groove at the inner circumferential surface, the coupling protrusion portion of the stator core being inserted into the stator-core-insertion supporting groove and thereby a lower end of the coupling protrusion portion is supported.