Electromagnetic Pump

Abstract

The invention relates to an electromagnetic pump comprising precisely one coil, wherein the one coil has a longitudinal axis, a ferromagnetic first core section at least partially arranged in the one coil, a ferromagnetic second core section at least partially arranged in the one coil, and a ferromagnetic armature, wherein a primary air gap is arranged between the armature and the first core section, wherein a radial secondary air gap is arranged between an insertion section of the armature and a receiving section of the second core section facing the longitudinal axis, wherein the ferromagnetic armature has a truncated cone-shaped contour narrowing in the stroke direction in a front section facing the first core section, wherein a magnetic force between the armature and the first core section is greater in a closing process of the first air gap; than a magnetic force between the armature and the second core section.

1 . An electromagnetic pump, comprising
 precisely one coil, wherein the one coil comprises a longitudinal axis,   a ferromagnetic first core part which is arranged at least in part in the one coil,   a ferromagnetic second core part which is arranged at least in part in the one coil, and   a ferromagnetic armature,   wherein a primary air gap is arranged between the armature and the first core part,   wherein a secondary air gap is radially arranged between an insertion portion of the armature and a receiving portion of the second core part that is turned to the longitudinal axis,   wherein the ferromagnetic armature comprises a truncated-cone-shaped contour which tapers in a stroke direction in a front region which faces the first core part,   wherein during a closing operation of the first air gap, a magnetic force between the armature and the first core part is greater than a magnetic force between the armature and the second core part, and   wherein the insertion portion of the armature comprises at least one conical portion which comprises an opening angle which deviates from the truncated-cone-shaped contour of the front region of the ferromagnetic armature.   
     
     
         2 . The electromagnetic pump as claimed in  claim 1 , wherein at least one of the insertion portion of the armature and the receiving portion of the second core part comprises a contour which deviates from the cylindrical contour over a region of at least one sixth of a maximum axial extension of the secondary air gap. 
     
     
         3 . The electromagnetic pump as claimed in  claim 1 , wherein at least one of the insertion portion of the armature and the receiving portion of the second core part is realized in a conical manner over a region of at least one sixth of a maximum axial extension of the secondary air gap. 
     
     
         4 . The electromagnetic pump as claimed in  claim 1 , wherein the insertion portion of the armature comprises a stepping with a widened secondary air gap. 
     
     
         5 . The electromagnetic pump as claimed in  claim 1 , wherein the receiving portion of the second core part comprises an inside projection which points to the longitudinal axis. 
     
     
         6 . The electromagnetic pump as claimed in  claim 1 , wherein, in a region of the secondary air gap, a maximum outside diameter of the insertion portion of the armature is smaller than a minimum inside diameter of the receiving portion of the second core part. 
     
     
         7 . The electromagnetic pump as claimed in  claim 1 , wherein the front region of the armature protrudes radially beyond an end face of the receiving portion of the second core part that faces the first core part. 
     
     
         8 . The electromagnetic pump as claimed in  claim 1 , wherein the conical portion of the insertion portion of the armature tapers in opposition to a truncated-cone-shaped contour of the front region of the armature which tapers in the stroke direction. 
     
     
         9 . The electromagnetic pump as claimed in  claim 8 , wherein the conical portion of the insertion portion of the armature extends in part outside the receiving portion. 
     
     
         10 . The electromagnetic pump as claimed in  claim 1 , wherein the conical portion of the receiving portion which tapers in opposition to the stroke direction adjoins an end face of the second core part that faces the first core part. 
     
     
         11 . The electromagnetic pump as claimed in  claim 1 , wherein the conical portion of the insertion portion which tapers in opposition to the stroke direction is steeper than the truncated-cone-shaped contour of the front region of the armature which tapers in the stroke direction. 
     
     
         12 . The electromagnetic pump as claimed in  claim 1 , wherein a region of the receiving portion, which is placed outside the conical portion of the receiving portion that tapers in opposition to the stroke direction and points in a pumping direction is realized in a cylindrical manner, and wherein a region of the insertion portion which penetrates into the cylinder region of the receiving portion is realized in a cylindrical manner. 
     
     
         13 . The electromagnetic pump as claimed in  claim 1 , wherein the armature assumes its maximum diameter in a space that is surrounded by the coil outside the receiving portion of the second core part and outside the first core part. 
     
     
         14 . The electromagnetic pump as claimed in  claim 1 , wherein an effective piston area of the armature which points in a pumping direction is greater than an effective piston area of the armature that points in the stroke direction. 
     
     
         15 . The electromagnetic pump as claimed in  claim 1 , wherein the pump is selected from the group comprising a reciprocating pump, a diaphragm pump, a pressure-regulating pump and a dosing pump.