Pump

Abstract

There is disclosed a pump comprising a pump housing, an impeller, and a motor. The pump housing comprises a pump chamber and at least one communication port opening into this pump chamber. The impeller comprises a plurality of vanes and is rotatably disposed in the pump chamber. The motor has a plurality of phases, and rotates the impeller. The number of communication ports, the number of vanes, and the number of phases of the motor are set in such a manner as to indicate prime numbers.

1 . A pump comprising: 
 a pump housing having a pump chamber and at least one communication port opening into this pump chamber;    an impeller having a plurality of vanes and being rotatably disposed in the pump chamber; and    a motor having a plurality of phases and rotating the impeller,    wherein the number of communication ports, the number of vanes, and the number of phases of the motor are prime numbers.    
   
   
       2 . The pump according to  claim 1 , wherein the plurality of vanes are arranged radially with respect to the center of rotation of the impeller, and 
 the plurality of vanes are arranged at equal intervals in such a manner that the angle formed by each pair of adjacent vanes is constant.    
   
   
       3 . The pump according to  claim 2 , wherein the pump housing has a pair of faces which define the pump chamber, 
 a convex portion including an end face having a pair of edges extending radially from a position facing the center of rotation of the impeller is disposed on at least one face of the pair of faces, and,    assuming that the angle formed by each pair of adjacent vanes is θ 1 , and the angle formed by the pair of edges of the end face of the convex portion is θ 2 , the angles θ 1  and θ 2  are set such that the value of θ 2 /θ 1  is not an integer.    
   
   
       4 . The pump according to  claim 3 , wherein, assuming that the angle formed by each pair of adjacent vanes is θ 1 , and the angle formed by the pair of edges of the end face of the convex portion is θ 2 , the angles θ 1  and θ 2  are set such that the value of θ 2 /θ 1  is an irrational number.  
   
   
       5 . The pump according to  claim 1 , wherein the plurality of vanes are arranged radially with respect to the center of rotation of the impeller, and 
 the plurality of vanes are arranged at unequal intervals such that at least one of the angles formed by each pair of adjacent vanes is different from the other said angles.    
   
   
       6 . The pump according to  claim 1 , wherein the pump housing has a heat receiving face thermally connected to a heat emitting member.  
   
   
       7 . A pump comprising: 
 a pump housing having a pump chamber and at least one communication port opening into this pump chamber;    an impeller comprising a plurality of vanes and being rotatably disposed in the pump chamber;    an annular rotor magnet disposed in the impeller; and    a stator having a plurality of phases and being disposed inside the rotor magnet,    wherein the number of communication ports, the number of vanes, and the number of phases of the stator are prime numbers.    
   
   
       8 . The pump according to  claim 7 , wherein the plurality of vanes are arranged radially with respect to the center of rotation of the impeller, and 
 the plurality of vanes are arranged at equal intervals in such a manner that the angle formed by each pair of adjacent vanes is constant.    
   
   
       9 . The pump according to  claim 8 , wherein the pump housing has a pair of faces which define the pump chamber, 
 a convex portion including an end face having a pair of edges extending radially from a position facing the center of rotation of the impeller is disposed on at least one face of the pair of faces, and,    assuming that the angle formed by each pair of adjacent vanes is θ 1 , and the angle formed by the pair of edges of the end face of the convex portion is θ 2 , the angles θ 1  and θ 2  are set such that the value of θ 2 /θ 1  is not an integer.    
   
   
       10 . The pump according to  claim 9 , wherein, assuming that the angle formed by each pair of adjacent vanes is θ 1 , and the angle formed by the pair of edges of the end face of the convex portion is θ 2 , the angles θ 1  and θ 2  are set such that the value of θ 2 /θ 1  is an irrational number.  
   
   
       11 . The pump according to  claim 7 , wherein the plurality of vanes are arranged radially with respect to the center of rotation of the impeller, and 
 the plurality of vanes are arranged at unequal intervals such that at least one of the angles formed by each pair of adjacent vanes is different from the other said angles.    
   
   
       12 . The pump according to  claim 7 ,wherein the pump housing has a heat receiving face thermally connected to a heat emitting member.  
   
   
       13 . A pump comprising: 
 a pump housing comprising a pump chamber;    an impeller comprising a plurality of vanes and being rotatably disposed in the pump chamber; and    a motor which rotates the impeller,    wherein the plurality of vanes are arranged radially with respect to the center of rotation of the impeller, and in such a manner that the angles formed by each pair of adjacent vanes represent non-constant interval.    
   
   
       14 . The pump according to  claim 13 ,wherein the pump housing has a heat receiving face thermally connected to a heat emitting member.