Linear compressor, particularly refrigerant compressor

Abstract

The invention concerns a linear compressor ( 1 ), particularly a refrigerant compressor, with a compression unit ( 3 ) having a cylinder ( 8 ) and a piston ( 16 ) reciprocating in the cylinder ( 8 ), and a linear motor ( 4 ) having an outer stator ( 18 ), an inner stator ( 20 ) and an armature ( 22 ) located in a gap ( 21 ) formed between the outer stator ( 18 ) and the inner stator ( 20 ), the armature ( 22 ) being connected to the piston ( 16 ) via a piston rod ( 28 ). It is endeavoured to design such a linear compressor in a simple manner with the smallest possible dimensions. For this purpose, it is ensured that the armature ( 22 ) is connected to the piston rod ( 28 ) inside the axial length of the inner stator ( 20 ).

1 . A linear compressor, particularly a refrigerant compressor, with a compression unit having a cylinder and a piston reciprocating in the cylinder, and a linear motor having an outer stator, an inner stator and an armature located in a gap formed between the outer stator and the inner stator, the armature being connected to the piston via a piston rod wherein the armature is connected to the piston rod inside the axial length of the inner stator.  
   
   
       2 . The linear compressor according to  claim 1 , wherein the compression unit is located axially outside the linear motor.  
   
   
       3 . The linear compressor according to  claim 1 , wherein the piston rod is guided through the entire axial length of the linear motor, a resonance spring arrangement being located on a side of the linear motor facing away from the compression unit.  
   
   
       4 . The linear compressor according to  claim 3 , wherein the piston rod is guided by the piston and the resonance spring arrangement.  
   
   
       5 . The linear compressor according to  claim 1 , wherein the cylinder is displaceable in relation to the outer stator during mounting.  
   
   
       6 . The linear compressor according to  claim 1 , wherein the armature and the piston rod are connected to each other via at least one connecting element, which is guided through at least two slots in the inner stator.  
   
   
       7 . The linear compressor according to  claim 6 , wherein the slots are made to be through over the axial length of the inner stator.  
   
   
       8 . The linear compressor according to  claim 6 , wherein the connecting element has an inner ring, which is connected to the piston rod.  
   
   
       9 . The linear compressor according to  claim 8 , wherein the inner ring bears under a predetermined pressure on a circumferential bearing surface of the piston rod.  
   
   
       10 . The linear compressor according to  claim 6 , wherein the connecting element has an outer ring, which is connected to the armature.  
   
   
       11 . The linear compressor according to  claim 10 , wherein the inner ring and the outer ring are connected to each other by means of at least two radially extending arms.  
   
   
       12 . The linear compressor according to  claim 1 , wherein the armature is formed by a cylinder pipe shaped permanent magnet arrangement, whose longitudinal axis coincides with the axis of the piston rod.  
   
   
       13 . The linear compressor according to  claim 1 , wherein the piston rod is connected to the armature in at least two positions, which have a distance in the axial direction.  
   
   
       14 . The linear compressor according to  claim 1 , wherein the axial and radial positions of the armature in relation to the piston rod are controlled by the connecting element.  
   
   
       15 . The linear compressor according to  claim 13 , wherein the armature is suspended axially between two connecting elements.  
   
   
       16 . The linear compressor according to  claim 13 , wherein at least one connecting element has a projection located radially inside the armature, the armature bearing from the radial outside on said projection.  
   
   
       17 . The linear compressor according to  claim 16 , wherein the projection is located in the area of the arms.