Impeller, electric air blower using same, and electric cleaner using electric air blower

Abstract

An impeller of the present invention includes a front surface shroud including an air intake port; a back surface shroud provided facing the front surface shroud; a first inducer provided between the front surface shroud and the back surface shroud and including a plurality of first blade sections provided around a first hub portion; a second inducer including a plurality of second blade sections connected to the first blade section of the first inducer and provided around a second hub portion; and a plurality of blades connected to the second blade section of the second inducer. A multi-blade structure of the inducer thus can be realized, and an impeller of high performance and low noise can be provided.

1 . An impeller comprising:
 a front surface shroud including an air intake port;   a back surface shroud provided facing the front surface shroud;   a first inducer provided between the front surface shroud and the back surface shroud and including a plurality of first blade sections provided around a first hub portion;   a second inducer including a plurality of second blade sections connected to the first blade section of the first inducer and provided around a second hub portion; and   a plurality of blades connected to the second blade section of the second inducer.   
     
     
         2 . The impeller according to  claim 1 , wherein the first blade section of the first inducer and the adjacent second blade section of the second inducer overlap each other. 
     
     
         3 . The impeller according to  claim 1 , wherein the number of the first blade section of the first inducer and the second blade section of the second inducer is at least seven. 
     
     
         4 . The impeller according to  claim 1 , wherein the first inducer and the second inducer are connected through a joining portion. 
     
     
         5 . The impeller according to  claim 4 , wherein a groove is formed in the joining portion. 
     
     
         6 . The impeller according to  claim 5 , wherein a groove is formed in a surface on the opposite side of rotating direction side of the first blade section or the second blade section. 
     
     
         7 . The impeller according to  claim 4 , wherein the joining portion is a connecting surface of the first blade section of the first inducer and the second blade section of the second inducer. 
     
     
         8 . The impeller according to  claim 7 , wherein the connecting surface further includes a connecting surface of the first hub portion and the second hub portion. 
     
     
         9 . The impeller according to  claim 1 , wherein the plurality of first blade sections of the first inducer are connected to each other with a ring portion. 
     
     
         10 . The impeller according to  claim 9 , wherein the first inducer and the ring portion are integrally molded. 
     
     
         11 . The impeller according to  claim 9 , wherein a projection is provided on an outer periphery of the ring portion. 
     
     
         12 . The impeller according to  claim 1 , wherein an inclination angle of the first blade section of the first inducer and an inclination angle of the second blade section of the second inducer are different. 
     
     
         13 . The impeller according to  claim 1 , wherein an axial height of the first blade section of the first inducer and an axial height of the second blade section of the second inducer are different. 
     
     
         14 . An electric air blower comprising the impeller according to  claim 1 , and an electric motor. 
     
     
         15 . An electric cleaner using the electric air blower according to  claim 14 .