Bistable electromagnetic valve

Abstract

Proposed herein is a bistable electromagnetic valve with a valve chamber arranged between two pole pieces and a valve body displaceable therein between two end positions, which is designed as a magnet armature for at least one permanent magnet and for at least one control coil, which is less susceptible to faults in comparison to known valves for refrigerant circuits. This object is achieved by having the valve ( 1 ) encompass a dirt filter ( 18, 19 ).

What is claimed is:  
     
         1 . Bistable, electromagnetic valve with a valve chamber arranged between two pole pieces and a valve body displaceable therein between two end positions, which is designed as a magnet armature for at least one permanent magnet and for at least one control coil, characterized in that the valve ( 1 ) encompasses a dirt filter ( 18 ,  19 ).  
     
     
         2 . Valve according to  claim 1 , characterized in that the dirt filter ( 18 ,  19 ) is arranged on the inflow side ( 20 ) of the valve chamber ( 7 ) in the valve housing ( 2 ).  
     
     
         3 . Valve according to one of the preceding claims, characterized in that the dirt filter ( 18 ,  19 ) is positioned right next to a pole piece ( 5 ).  
     
     
         4 . Valve according to one of the preceding claims, characterized in that the dirt filter ( 18 ,  19 ) is permanently installed in the valve housing ( 2 ).  
     
     
         5 . Valve according to one of the preceding claims, characterized in that a magnetic dirt filter ( 19 ) is provided.  
     
     
         6 . Valve according to one of the preceding claims, characterized in that the magnetic dirt filter ( 19 ) is designed as a permanent magnet in direct contact with the fluid.  
     
     
         7 . Valve according to one of the preceding claims, characterized in that the magnetic dirt filter ( 19 ) is designed as an annular magnet.  
     
     
         8 . Valve according to one of the preceding claims, characterized in that a mechanical filter ( 18 ) is provided.  
     
     
         9 . Valve according to one of the preceding claims, characterized in that a mechanical filter ( 18 ) and a magnet filter ( 19 ) are provided.  
     
     
         10 . Valve according to one of the preceding claims, characterized in that the magnet filter ( 19 ) is designed as a mount for the mechanical filter ( 18 ).  
     
     
         11 . Valve according to one of the preceding claims, characterized in that the mechanical filter ( 18 ) is designed as a tubular sieve.  
     
     
         12 . Valve according to one of the preceding claims, characterized in that the interior space of the tubular sieve ( 18 ) is connected with the inflow ( 20 ), and the exterior space ( 22 ) is connected with the valve chamber ( 7 ).  
     
     
         13 . Valve according to one of the preceding claims, characterized in that the sieve openings ( 21 ) have a diameter ranging between 50μ and 80μ.  
     
     
         14 . Valve according to one of the preceding claims, characterized in that the tubular sieve ( 18 ) has a corrugated or folded cross-section.  
     
     
         15 . Valve according to one of the preceding claims, characterized in that the tubular sieve ( 18 ) has a star-shaped cross section.  
     
     
         16 . Valve according to one of the preceding claims, characterized in that the magnet filter ( 19 ) is arranged on the inflow side ( 20 ) of the mechanical sieve ( 18 ).  
     
     
         17 . Refrigerating circuit for a refrigeration system, in particular with several refrigerating compartments, a compressor, a condenser, several evaporators, which each are allocated to one of the refrigerating compartments, as well as at least one electric control valve for connecting the condenser with one or more of the evaporators based on predetermined operating modes, characterized in that the control valve ( 1 ) is designed according to one of the preceding claims.  
     
     
         18 . Household appliance with a refrigerating circuit, in particular a refrigerator or freezer chest, characterized in that a refrigeration circuit is provided with a valve according to one of  claims 1  to  16 .