Electric blower and electric vacuum cleaner equipped with same

Abstract

An electric blower includes: a rotor assembly; and a housing accommodating the rotor assembly, and having an intake port and a discharge port. The rotor assembly includes: a shaft; an impeller mounted on the shaft, and generating a negative pressure at the intake port by rotation; a rotor core mounted on the shaft; and a pair of bearings having an inner peripheral side mounted on an outer periphery of the shaft, and having an outer peripheral side fixedly mounted on the housing. The pair of bearings are arranged between the impeller and the rotor core. The housing includes a frame formed of an integral body of a bearing holding portion and a stator holding portion, the bearing holding portion holding the pair of bearings in a state where outer peripheral surfaces of the bearings are in contact with the bearing holding portion, and the stator holding portion holding a stator which drives the rotor core.

1 . An electric blower comprising:
 a rotor assembly; and   a housing accommodating the rotor assembly, and having an intake port and a discharge port, wherein   the rotor assembly includes:   a shaft;   an impeller mounted on the shaft, and generating a negative pressure at the intake port by rotation;   a rotor core mounted on the shaft; and   a pair of bearings having an inner peripheral side mounted on an outer periphery of the shaft, and having an outer peripheral side fixedly mounted on the housing,   the pair of bearings are arranged between the impeller and the rotor core,   the housing includes a frame formed of an integral body of a bearing holding portion and a stator holding portion, the bearing holding portion holding the pair of bearings in a state where outer peripheral surfaces of the bearings are in contact with the bearing holding portion, and the stator holding portion holding a stator which drives the rotor core, and   the bearing holding portion projects in an axial direction of the bearing holding portion toward the stator holding portion side.   
     
     
         2 . (canceled) 
     
     
         3 . The electric blower according to  claim 1 , wherein the frame is made of an aluminum alloy. 
     
     
         4 . The electric blower according to  claim 1 , wherein
 the bearing is fixed to the bearing holding portion by an adhesive agent having an elastic modulus smaller than an elastic modulus of the bearing or the bearing holding portion.   
     
     
         5 . The electric blower according to  claim 1 , wherein
 the frame has an air hole through which a flow of air generated due to the driving of the impeller flows into the frame.   
     
     
         6 . The electric blower according to  claim 1 , wherein
 the frame includes a rib in a flow passage for the flow of air generated due to the driving of the impeller.   
     
     
         7 . An electric vacuum cleaner comprising the electric blower described in  claim 1 .