Pump device

Abstract

A pump device may include a stator provided with a stator core having a ring-shaped part on a center side and a drive coil wound around the stator core, and a partition wall disposed configured to separate a pump chamber from the stator. The partition wall is provided with a protruded part in a bottomed tube-like shape which is protruded on an inner side of the ring-shaped part and an outer peripheral face of a tube shaped part structuring the protruded part is formed with a plurality of protruding parts protruding to an outer side in a radial direction. The stator core is fixed to the protruded part in a state that the plurality of the protruding parts is press-fitted to the ring-shaped part.

1 . A pump device comprising:
 a stator comprising:
 a stator core having a ring-shaped part on a center side; and 
 a drive coil which is wound around the stator core; 
   a rotor provided with an impeller and a drive magnet which faces the stator through a predetermined distance on an outer peripheral side of the stator; and   a partition wall which is disposed between the stator and the rotor for separating a pump chamber in which the impeller is disposed from the stator;   wherein the partition wall is provided with a protruded part in a bottomed tube-like shape which is protruded on an inner side of the ring-shaped part;   wherein an outer peripheral face of a tube shaped part structuring the protruded part is formed with a plurality of protruding parts which protrude from parts in a circumferential direction to an outer side in a radial direction; and   wherein the stator core is fixed to the protruded part in a state that the plurality of the protruding parts is press-fitted to the ring-shaped part.   
     
     
         2 . The pump device according to  claim 1 , wherein
 an inner peripheral face of the ring-shaped part of the stator core is provided with a plurality of recessed parts to which each of the plurality of the protruding parts is capable of being press-fitted, and   the protruding parts are press-fitted to the recessed parts.   
     
     
         3 . The pump device according to  claim 2 , wherein
 both side portions in the circumferential direction of the protruding part are press-fitted to the recessed part, and   a clearance is provided between a tip end on an outer side in the radial direction of the protruding part and the recessed part.   
     
     
         4 . The pump device according to  claim 2 , wherein the plurality of the protruding parts is formed in a same shape as each other and is formed at three or more positions at an equal angular interval. 
     
     
         5 . The pump device according to  claim 4 , wherein
 the protruding part is extended in an axial line direction along the outer peripheral face of the tube shaped part and is provided with a tapered face whose protruding amount to an outer side in the radial direction and to the circumferential direction is increased from a side of a bottom part of the protruded part in the bottomed tube-like shape toward a side of an opening end of the protruded part, and   a part of the protruding part on the side of the opening end is press-fitted to the ring-shaped part of the stator core.   
     
     
         6 . The pump device according to  claim 1 , wherein
 the partition wall is provided with a cylindrical tube part provided on an outer peripheral side of the protruded part and a circular ring-shaped part which connects an opening end of the protruded part with the cylindrical tube part,   the stator is accommodated in a circular ring-shaped recessed part for accommodating the stator which is formed of the protruded part, the cylindrical tube part and the circular ring-shaped part, and   the stator is covered by a sealing agent which is poured into the circular ring-shaped recessed part for accommodating the stator.   
     
     
         7 . The pump device according to  claim 6 , wherein
 the protruded part in the bottomed tube-like shape is provided with a protruding portion which protrudes in an axial line direction from an opening of the circular ring-shaped recessed part for accommodating the stator on a bottom part side of the protruded part, and   an end of the protruding part on the bottom part side of the protruded part is reached to the protruding portion.   
     
     
         8 . The pump device according to  claim 7 , wherein
 the partition wall is a resin molded product, and   an inner peripheral face of the tube shaped part structuring the protruded part is formed with a groove at a position corresponding to the protruding part formed on the outer peripheral face of the tube shaped part.   
     
     
         9 . The pump device according to  claim 8 , wherein
 a support shaft which rotatably supports the rotor is fixed to an inner side face of the bottom part of the protruded part,   the rotor is provided with a bearing part in a tube-like shape,   the bearing part is disposed on an inner side of the protruded part in a state that the support shaft is inserted into a center hole of the bearing part,   a washer for adjusting a position in the axial line direction of the rotor is fitted between the bottom part of the protruded part and the bearing part,   the washer is formed with a turning prevention part protruding to an outer side in the radial direction from an outer circumferential edge portion of the washer, and   the turning prevention part is fitted to the groove formed on the inner peripheral face of the tube shaped part.   
     
     
         10 . The pump device according to  claim 6 , wherein a support shaft which rotatably supports the rotor is fixed to an inner side face of the bottom part of the protruded part. 
     
     
         11 . The pump device according to  claim 1 , wherein
 an outer peripheral face of the tube shaped part structuring the protruded part is provided with a positioning part which is abutted with the ring-shaped part of the stator core from a side of an opening end of the protruded part in the bottomed tube-like shape for positioning the stator in an axial line direction, and   the positioning part and the protruding part are formed at a separated position from each other in a circumferential direction.   
     
     
         12 . The pump device according to  claim 1 , wherein the pump device comprises:
 a first case which structures the partition wall and is provided with a circular ring-shaped protruded part on an inner side of an outer peripheral wall;   a second case which is provided with a circular ring-shaped stepped part into which the circular ring-shaped protruded part is coaxially inserted and which partitions the pump chamber on an inner peripheral side of the circular ring-shaped stepped part together with the first case; and   an O-ring which is attached on a circular outer peripheral face of the circular ring-shaped protruded part and is crushed between the circular outer peripheral face of the circular ring-shaped protruded part and a circular inner peripheral face of the circular ring-shaped stepped part in a direction perpendicular to an axial line of the circular ring-shaped protruded part.   
     
     
         13 . The pump device according to  claim 12 , wherein
 the first case is provided with a cylindrical tube part formed on an outer peripheral side of the protruded part and a circular ring-shaped part connecting an opening end of the protruded part with the cylindrical tube part,   the stator is accommodated in a circular ring-shaped recessed part for accommodating the stator which is formed of the protruded part, the cylindrical tube part and the circular ring-shaped part, and   the stator is covered by a sealing agent which is poured into the circular ring-shaped recessed part for accommodating the stator.   
     
     
         14 . The pump device according to  claim 13 , wherein
 the second case comprises:
 a bottom plate part; 
 a side wall part in a ring shape which is stood up from an outer peripheral side portion of the bottom plate part; and 
 a circular recessed part which is formed of the bottom plate part and the side wall part; 
   an inner peripheral face on an upper side of the side wall part is formed with the circular ring-shaped stepped part; and   a liquid flow passage is structured between the circular ring-shaped protruded part of the first case and the circular recessed part of the second case at a position on an inner side with respect to the circular ring-shaped stepped part.   
     
     
         15 . A pump device comprising:
 a stator comprising:
 a stator core having a ring-shaped part on a center side; and 
 a drive coil which is wound around the stator core; and 
   a partition wall configured to separate a pump chamber from the stator;   wherein the partition wall is provided with a protruded part in a bottomed tube-like shape which is protruded on an inner side of the ring-shaped part;   wherein an outer peripheral face of a tube shaped part structuring the protruded part is formed with a plurality of protruding parts which protrude from parts in a circumferential direction to an outer side in a radial direction; and   wherein the stator core is fixed to the protruded part in a state that the plurality of the protruding parts is press-fitted to the ring-shaped part.