Solenoid valve

Abstract

A solenoid valve for controlling a fluid has a first housing part ( 2 ), an axial guide ( 3 ), facing inwards, for an armature ( 4 ) which can be displaced in the axial guide ( 3 ) under the effect of a solenoid ( 5 ) that at least partially surrounds the exterior of the first housing part ( 2 ), a return spring ( 6 ) and a closing element ( 27 ) impacting a valve closing element ( 7 ), and a second housing part ( 9 ) which is arranged coaxially to the first housing part ( 2 ). The solenoid valve according to the invention is characterized in that the first housing part ( 2 ) has a reduced wall portion ( 17 ) which faces inwards towards the armature ( 4 ) and the second housing part ( 9 ) and which effects a magnetic separation of the two housing parts ( 2, 9 ) to at least some extent.

1 . A solenoid valve for controlling a fluid having a first housing part ( 2 ), with an axial guide ( 3 ) which is oriented toward the interior for an armature ( 4 ) which, under the action of a solenoid ( 5 ) that at least partially surrounds the first housing part ( 2 ) to the outside, can be moved in the axial guide ( 3 ), with a reset spring ( 6 ) and a closing element ( 27 ) which acts on the valve closing member ( 7 ), and having a second housing part ( 9 ) which is located coaxially to the first housing part ( 2 ), characterized in that the first housing part ( 2 ) has a wall reduction ( 17 ) which is oriented toward the interior in the direction of the armature ( 4 ) and of the second housing part ( 9 ) and which at least partially effects magnetic separation of the two housing parts ( 2 ,  9 ) from one another. 
     
     
         2 . The solenoid valve according to  claim 1 , characterized in that the first housing part ( 2 ) has a thin-walled sleeve ( 14 ) as a pole tube which essentially forms the axial guide ( 3 ) for the armature ( 4 ), and that the second housing part ( 9 ) projects into the sleeve ( 14 ) at least partially in contact with the sleeve ( 14 ). 
     
     
         3 . The solenoid valve according to  claim 2 , characterized in that the sleeve ( 14 ) has the wall reduction ( 17 ) in the form of a groove ( 18 ) on its inner circumference ( 19 ). 
     
     
         4 . The solenoid valve according to  claim 3 , characterized in that the groove ( 18 ) has flat flanks ( 10 ) which extend to the adjacent wall regions of the sleeve ( 14 ). 
     
     
         5 . The solenoid valve according to  claim 1 , characterized in that the wall reduction ( 17 ) is located in an overlapping region ( 21 ) of the armature ( 4 ) with the second housing part ( 9 ), in which a ring-shaped end ( 39 ) of the armature ( 4 ) overlaps a step-shaped shoulder on a side of the second housing part ( 9 ) that is adjacent to the armature ( 4 ). 
     
     
         6 . The solenoid valve according to  claim 5 , characterized in that in a position spaced away from the armature ( 4 ) to the housing part ( 9 ), a middle section of the groove ( 18 ) in the sleeve ( 14 ) overlaps an empty space in the overlapping region ( 21 ). 
     
     
         7 . The solenoid valve according to  claim 1 , characterized in that the first housing part ( 2 ) and the second housing part ( 9 ) are connected to one another as a plug connection, in which the first housing part ( 2 ) at least partially overlaps the second housing part ( 9 ) viewed in the axial direction of actuation of the valve, and that one free end of the housing part ( 2 ) made as a flanged edge mates with a circumferential groove ( 16 ) in the second housing part ( 9 ). 
     
     
         8 . The solenoid valve according to  claim 7 , characterized in that the other free end of the first housing part ( 2 ) forms a valve body ( 35 ) for the valve closing member ( 7 ), which valve closing member, to the extent that it is concomitantly controlled by the closing element ( 27 ), clears or blocks a fluid-carrying connection between two valve ports ( 29 ,  30 ) of the valve body ( 35 ). 
     
     
         9 . The solenoid valve according to  claim 1 , characterized in that the second housing part ( 9 ) has a set screw ( 23 ) that is dynamically connected to a stem ( 8 ), and, when the set screw is manually actuated, the stem ( 8 ), which with an extension ( 11 ) at least partially extends through the second housing part ( 9 ) along an axially routed recess ( 10 ), can be moved together with the armature ( 4 ) into a position in the sense of an opening of the valve closing member ( 7 ). 
     
     
         10 . The solenoid valve according to  claim 1 , characterized in that the solenoid valve ( 1 ) is piloted.