Magnetic drive pump

Abstract

A magnetic drive pump includes a pump chamber, a partition wall separating the pump chamber from an exterior portion, an impeller disposed in the pump chamber and rotating around a rotation axis, an inductor unitarily rotating with the impeller around the rotation axis, a magnet unit disposed at a position of the exterior portion separated by the partition wall where the magnet unit faces the inductor in a radial direction of the rotation axis, the magnet unit being rotatable around the rotation axis, and a rotation driving means driving the magnet unit to rotate, wherein a displacement mechanism is provided for changing a radial distance between the magnet unit and the inductor.

1 . A magnetic drive pump comprising:
 a pump chamber;
 a partition wall separating the pump chamber from an exterior portion; 
 an impeller disposed in the pump chamber and rotating around a rotation axis; 
 an inductor unitarily rotating with the impeller around the rotation axis; 
 a magnet unit disposed at a position of the exterior portion separated by the partition wall where the magnet unit faces the inductor in a radial direction of the rotation axis, the magnet unit being rotatable around the rotation axis; and 
 a rotation driving means driving the magnet unit to rotate, 
 wherein a displacement mechanism is provided for changing a radial distance between the magnet unit and the inductor. 
   
   
   
       2 . A magnetic drive pump according to  claim 1 , wherein the displacement mechanism is formed as a cam displacement mechanism having an operation body in which a cam portion displacing the magnet unit in the radial direction is formed. 
   
   
       3 . A magnetic drive pump according to  claim 2 , wherein the cam displacement mechanism is comprised of the operation body moving in an axial direction of the rotation axis and the magnet unit moving in the radial direction of the rotation axis. 
   
   
       4 . A magnetic drive pump according to  claim 1 , wherein the magnet unit is pivotable around a supporting shaft, which is provided at one circumferential end of the magnet unit and is in parallel to the rotation axis, and the displacement mechanism is formed as a pivoting displacement mechanism which causes pivotal movement of the magnet unit in the radial direction by manipulating the other circumferential end of the magnet unit in the radial direction. 
   
   
       5 . A magnetic drive pump according to  claim 4 , wherein the pivoting displacement mechanism includes a rotational operation body being rotatable around the rotation axis in response to rotational displacement and a link body pivotably supported by the rotational operation body at one end thereof and pivotably supported by the magnet unit at the other end thereof.