Dust collector

Abstract

A dust collector, including a casing, a dust collection system arranged in the casing, an impeller ( 100 ) and a permanent magnet type brushless direct current motor ( 200 ). The impeller ( 100 ) is arranged in the casing and located downstream of the dust collection system. The permanent magnet type brushless direct current motor ( 200 ) is connected to the impeller ( 100 ) and located at a side, far away from the dust collection system, of the impeller ( 100 ). The permanent magnet type brushless direct current motor ( 200 ) includes a stator ( 2 ), a rotor ( 3 ) and a block-shaped permanent magnet ( 4 ). The rotor ( 3 ) and the stator ( 2 ) are arranged coaxially, the rotor ( 3 ) can rotate relative to the stator ( 2 ), and the permanent magnet ( 4 ) is fixed to the rotor ( 3 ).

1 . A dust collector, comprising:
 a casing defining a dust suction inlet and an air exhaust port arranged spaced apart, and provided with an electric control board therein;   a dust collection system arranged in the casing so as to filter a fluid entering the casing from the dust suction inlet;   an impeller disposed in the casing and located downstream of the dust collection system; and   a permanent magnet type brushless direct current motor disposed in the casing, connected with the impeller, and located at a side, far away from the dust collection system, of the impeller, wherein the permanent magnet type brushless direct current motor comprises a stator, a rotor and a block-shaped permanent magnet, the rotor is disposed coaxially with the stator and rotatable relative to the stator, and the permanent magnet is fixed to the rotor.   
     
     
         2 . The dust collector according to  claim 1 , wherein the permanent magnet is disposed at a side, adjacent to the stator, of the rotor. 
     
     
         3 . The dust collector according to  claim 2 , further comprising:
 a protection sleeve provided over the rotor so as to fix the permanent magnet to the rotor.   
     
     
         4 . The dust collector according to  claim 3 , wherein the protection sleeve comprises:
 a connecting segment formed in an annular shape, and connected to an end of the rotor; and   a fixing segment, wherein an end of the fixing segment is connected to a periphery of the connecting segment, the fixing segment is disposed around the rotor and spaced apart from a periphery of the rotor so as to define an accommodating groove, and the permanent magnet is accommodated in the accommodating groove.   
     
     
         5 . The dust collector according to  claim 1 , wherein a plurality of the permanent magnets is provided and the plurality of the permanent magnets is spaced apart uniformly in a circumferential direction of the rotor. 
     
     
         6 . The dust collector according to  claim 5 , wherein the permanent magnet is disposed at a side, adjacent to the stator, of the rotor. 
     
     
         7 . The dust collector according to  claim 6 , further comprising:
 a protection sleeve provided over the rotor so as to fix the permanent magnet to the rotor.   
     
     
         8 . The dust collector according to  claim 7 , wherein the protection sleeve comprises:
 a connecting segment formed in an annular shape, and connected to an end of the rotor; and   a fixing segment, wherein an end of the fixing segment is connected to a periphery of the connecting segment, the fixing segment is disposed around the rotor and spaced apart from a periphery of the rotor so as to define an accommodating groove, and the permanent magnet is accommodated in the accommodating groove.   
     
     
         9 . The dust collector according to  claim 1 , wherein the electric control board is located at an axial side of the rotor, a sensor is disposed at a side, adjacent to the rotor, of the electric control board, and the sensor is disposed adjacent to the permanent magnet. 
     
     
         10 . The dust collector according to  claim 9 , wherein the permanent magnet is disposed at a side, adjacent to the stator, of the rotor. 
     
     
         11 . The dust collector according to  claim 10 , further comprising:
 a protection sleeve provided over the rotor so as to fix the permanent magnet to the rotor.   
     
     
         12 . The dust collector according to  claim 11 , wherein the protection sleeve comprises:
 a connecting segment formed in an annular shape, and connected to an end of the rotor; and   a fixing segment, wherein an end of the fixing segment is connected to a periphery of the connecting segment, the fixing segment is disposed around the rotor and spaced apart from a periphery of the rotor so as to define an accommodating groove, and the permanent magnet is accommodated in the accommodating groove.   
     
     
         13 . The dust collector according to  claim 5 , wherein the electric control board is located at an axial side of the rotor, a sensor is disposed at a side, adjacent to the rotor, of the electric control board, and the sensor is disposed adjacent to the permanent magnet. 
     
     
         14 . The dust collector according to  claim 13 , wherein the permanent magnet is disposed at a side, adjacent to the stator, of the rotor. 
     
     
         15 . The dust collector according to  claim 14 , further comprising:
 a protection sleeve provided over the rotor so as to fix the permanent magnet to the rotor.   
     
     
         16 . The dust collector according to  claim 15 , wherein the protection sleeve comprises:
 a connecting segment formed in an annular shape, and connected to an end of the rotor; and   a fixing segment, wherein an end of the fixing segment is connected to a periphery of the connecting segment, the fixing segment is disposed around the rotor and spaced apart from a periphery of the rotor so as to define an accommodating groove, and the permanent magnet is accommodated in the accommodating groove.   
     
     
         17 . The dust collector according to  claim 9 , wherein an insulating piece is disposed at an end, adjacent to the electric control board, of the stator, a protrusion extending towards the electric control board is disposed on the insulating piece, and an end of the protrusion away from the stator contacts the electric control board. 
     
     
         18 . The dust collector according to  claim 1 , wherein the permanent magnet is made of magnetic steel. 
     
     
         19 . The dust collector according to  claim 1 , wherein the rotor is disposed inside or outside the stator. 
     
     
         20 . The dust collector according to  claim 1 , wherein the permanent magnet is adhered to the rotor.