Pump for liquid cooling system

Abstract

A pump includes a base ( 10 ), a case ( 20 ) fixed on the base, a stator ( 30 ) embedded into the case, a rotor unit ( 40 ) sandwiched between the base and the case. The rotor unit includes an inner rotor ( 42 ) surrounded by the stator and an outer rotor ( 44 ) surrounding the stator. Magnetic fields produced by the stator have interior parts interacting with the inner rotor, and exterior parts interlinking with the outer rotor. Therefore, the magnetic fields are able to be utilized sufficiently to drive the rotor unit to have a high speed rotation, and an operation efficiency of the pump is enhanced accordingly.

1 . A pump for use with a liquid cooling system, comprising:
 a base;   a case fixed on the base;   a stator embedded into the case;   a rotor unit received between the case and the base, the rotor unit being separated in a liquid-isolating relationship with the stator, comprising:
 an inner rotor surrounded by the stator; 
 an outer rotor surrounding the stator; and 
 a plurality of blades attached below the inner rotor and the outer rotor for driving the liquid to flow. 
   
   
   
       2 . The pump as claimed in  claim 1 , wherein the rotor comprises a circular panel, the plurality of blades being fixed on a bottom of the circular panel, and the inner rotor and the outer rotor being secured on a top of the circular panel. 
   
   
       3 . The pump as claimed in  claim 2 , wherein the rotor further comprises a pair of inner coaxial sidewalls extending upwardly from the top of the circular panel and sandwiching the inner rotor therebetween, a pair of outer coaxial sidewalls extending upwardly from the top of the circular panel and sandwiching the outer rotor therebetween, and a shaft enclosed by the pair of inner coaxial sidewalls. 
   
   
       4 . The pump as claimed in  claim 3 , wherein the case defines an annular cavity having an opening oriented upwardly, the stator being received in the annular cavity. 
   
   
       5 . The pump as claimed in  claim 4 , wherein the case defines a circular cavity having an opening oriented downwardly and receiving the shaft of the rotor unit therein, an annular chamber having an opening oriented downwardly and receiving the pair of inner coaxial sidewalls of the rotor unit therein, and another annular chamber having an opening oriented downwardly and receiving the pair of outer coaxial sidewalls of the rotor unit therein. 
   
   
       6 . The pump as claimed in  claim 5 , wherein the annular cavity of the case is surrounded by the annular chamber and surrounds the circular cavity, and the another annular chamber surrounds the annular chamber. 
   
   
       7 . The pump as claimed in  claim 5  further comprising a bearing accommodated in the circular cavity of the case for supporting the shaft of the rotor unit therein. 
   
   
       8 . The pump as claimed in  claim 4 , wherein a part of the case surrounded by the annular cavity is shorter than other parts of the case. 
   
   
       9 . The pump as claimed in  claim 8  further comprising a printed circuit board disposed on the stator and in the annular cavity of the case, wherein a top face of the printed circuit board is coplanar with a top face of the part of the case surrounded by the annular cavity. 
   
   
       10 . The pump as claimed in  claim 4  further comprising a cover fixed on the case to overlay the stator, cross-sectional areas of the cover, the case, and the base being equal to each other. 
   
   
       11 . The pump as claimed in  claim 2 , wherein the base defines a transverse hole in an upper portion thereof, a horizontal hole in a lower portion thereof, and an upright hole from a top to a bottom thereof, the upright hole communicating the horizontal hole with the transverse horizontal hole and receiving the plurality of blades of the rotor unit therein. 
   
   
       12 . The pump as claimed in  claim 11  further comprising an annulus received in the upright hole and at a middle of a height of the base to separate the horizontal hole with the transverse hole of the base, wherein the rotor unit is located above the annulus. 
   
   
       13 . The pump as claimed in  claim 1 , wherein each of the inner rotor and the outer rotor has alternating N and S magnetic poles distributed evenly therearound, a number of the N and S magnetic poles of the inner rotor being essentially identical to that of the outer rotor. 
   
   
       14 . The pump as claimed in  claim 13 , wherein each of the N magnetic poles of the inner rotor faces each of the S magnetic poles of the outer rotor, both of which have an equal angular width. 
   
   
       15 . The pump as claimed in  claim 13 , wherein the magnetic poles of the inner rotor and the magnetic poles of the outer rotor in facing relationship have opposite polarities. 
   
   
       16 . The pump as claimed in  claim 13 , wherein each of the S magnetic poles of the inner rotor and each of the N magnetic poles of the outer rotor are staggered each other with an acute angle defined therebetween. 
   
   
       17 . The pump as claimed in  claim 15 , wherein the stator comprises a plurality of teeth positioned in a circumferentially equidistant relationship therein, a number of the teeth is identical to the number of the S and N magnetic poles of the inner rotor. 
   
   
       18 . A liquid pump, comprising:
 a casing defining therein a chamber, an inlet and an outlet both being in flow communication with the chamber;   a rotor received in the chamber and being rotatable to drive liquid to enter the chamber via the inlet and to exit the chamber via the outlet, the rotor comprising a cylindrical outer wall, a cylindrical inner wall and a substrate connecting with a bottom end of the outer and inner walls, an agitator being formed on a bottom surface of the substrate;   an outer magnetic ring embedded in the outer wall of the rotor and an inner magnetic ring embedded in the inner wall of the rotor;   a stator received in the chamber to drive the rotor to rotate;   a partition seat received in the chamber and arranged between the stator and the rotor to space the stator and the rotor; and   a top cover mounted to a top of the casing.   
   
   
       19 . The liquid pump as described in  claim 18 , wherein each of the outer and inner magnetic rings have a plurality of alternating N and S poles, and have different poles at opposing surfaces thereof so that a attractive force exists therebetween.