Pump

Abstract

A pump includes a case, a base disposed in the case and a rotor. The rotor includes a magnetic extension portion which surrounds a yoke. The pump gains efficiency in view of the above without increasing volume. Furthermore, the pump includes a first magnet and a second magnet, positioned on the rotor and the inside of the case individually. A magnetic force is generated between the first and second magnets to limit the rotor to rotate in a predetermined position, increasing utility life of the pump.

1 . A pump, comprising: 
 a case;    a base disposed in the case for supporting a coil; and    a rotor comprising a shaft, an impeller and a magnetic extension portion, wherein the rotor is coupled to the base via the shaft, the magnetic extension portion surrounds the coil, and the magnetic extension portion comprises a yoke disposed therein.    
   
   
       2 . The pump as claimed in  claim 1 , wherein the coil is disposed around the base and adjacent to a position where the shaft are connected thereto.  
   
   
       3 . The pump as claimed in  claim 2 , wherein the rotor further comprises a hole, the shaft is mounted into the hole so that the rotor rotates with respect to the base.  
   
   
       4 . The pump as claimed in  claim 2 , wherein the shaft is connected to the rotor and mounted into the base so that the rotor rotates with respect to the base.  
   
   
       5 . The pump as claimed in  claim 1 , further comprising a first magnet and a second magnet, wherein the first magnet is disposed on the rotor, the second magnet is disposed inside the case corresponding to the first magnet, and a magnetic force is generated between the first and second magnets to limit the rotor to rotate in a predetermined position.  
   
   
       6 . The pump as claimed in  claim 5 , wherein the magnetic force is a repulsive force along an axial direction of the shaft.  
   
   
       7 . The pump as claimed in  claim 5 , wherein a profile of the first magnet is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.  
   
   
       8 . The pump as claimed in  claim 5 , wherein a profile of the second magnet is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.  
   
   
       9 . The pump as claimed in  claim 5 , wherein the first and second magnets have the same profile.  
   
   
       10 . The pump as claimed in  claim 1 , wherein a profile of the yoke is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.  
   
   
       11 . A pump, comprising: 
 a case;    a base disposed in the case for supporting a coil;    a rotor comprising a shaft, an impeller and a magnetic extension portion, wherein the rotor is coupled to the base via the shaft, and the magnetic extension portion surrounds the coil;    a first magnet disposed on the rotor; and    a second magnet disposed inside the case corresponding to the first magnet, wherein a magnetic force is generated between the first and second magnets to limit the rotor to rotate in a predetermined position.    
   
   
       12 . The pump as claimed in  claim 11 , wherein the coil is disposed around the base and adjacent to the shaft.  
   
   
       13 . The pump as claimed in  claim 11 , wherein the magnetic force is a repulsive force along an axial direction of the shaft.  
   
   
       14 . The pump as claimed in  claim 11 , wherein a profile of the first magnet is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.  
   
   
       15 . The pump as claimed in  claim 11 , wherein a profile of the second magnet is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.  
   
   
       16 . The pump as claimed in  claim 11 , wherein the first and second magnets have the same profile.  
   
   
       17 . The pump as claimed in  claim 12 , wherein the rotor further comprises a hole, the shaft is mounted into the hole so that the rotor rotates with respect to the base.  
   
   
       18 . The pump as claimed in  claim 12 , wherein the shaft is connected to the rotor and mounted into the base so that the rotor rotates with respect to the base.  
   
   
       19 . The pump as claimed in  claim 11 , wherein the magnetic extension portion comprises a yoke disposed therein.  
   
   
       20 . The pump as claimed in  claim 19 , wherein a profile of the yoke is selected from a group consisting of a hollow pillar, a cylinder, a cuboid and an annular plate.