Linear compressor, particularly refrigerant compressor

Abstract

The invention concerns a linear compressor ( 1 ), particularly a refrigerant compressor, with a first component group comprising a stator ( 18, 20 ) of a linear motor ( 4 ) and a cylinder ( 8, 10 ), a second component group comprising a reciprocating piston ( 16 ) and an armature ( 22 ) of the linear motor ( 4 ) as well as a piston rod ( 28 ) connecting the armature ( 22 ) to the piston ( 16 ), an oil sump in a housing ( 2 ) and an oil pump ( 38 ), the second component group being movable in relation to the first component group. It is endeavoured to provide a simple design ensuring a lubrication of the linear compressor. For this purpose, the oil pump ( 38 ) has a pump housing ( 40 ) that is permanently connected to the piston rod ( 28 ), the pump housing ( 40 ) immersing with at least one suction opening ( 43; 43 a, 43 b ) into the oil sump ( 41 ), the oil pump ( 38 ) supplying oil to the inside of the piston rod ( 28 ).

1 . A linear compressor, particularly a refrigerant compressor, with a first component group comprising a stator of a linear motor and a cylinder, a second component group comprising a reciprocating piston and an armature of the linear motor as well as a piston rod connecting the armature to the piston, an oil sump in a housing and an oil pump, the second component group being movable in relation to the first component group, wherein the oil pump has a pump housing that is permanently connected to the piston rod, the pump housing immersing with at least one suction opening into the oil sump, the oil pump supplying oil to the inside of the piston rod.  
   
   
       2 . The linear compressor according to  claim 1 , wherein the oil pump is located at the end of the piston rod facing away from the piston.  
   
   
       3 . The linear compressor according to  claim 1 , wherein the piston rod has a channel, which is connected to a piston joint.  
   
   
       4 . The linear compressor according to  claim 1 , wherein the piston rod is supplied with at least one pressure equalisation opening.  
   
   
       5 . The linear compressor according to  claim 1 , wherein the piston rod has a connecting element to the piston, whose inner diameter tapers.  
   
   
       6 . The linear compressor according to  claim 1 , wherein at least one inner diameter reduction is located inside the piston rod.  
   
   
       7 . The linear compressor according to  claim 6 , wherein a recess is located adjacent to the inner diameter reduction.  
   
   
       8 . The linear compressor according to  claim 1 , wherein the piston rod has a suction end, whose outer diameter reduces in a direction away from the piston.  
   
   
       9 . The linear compressor according to  claim 8 , wherein the suction end has a suction channel, which ends inside the piston rod and has a smaller inner diameter than the piston rod, the end of the suction channel being surrounded by a projection pointing in the direction of the piston.  
   
   
       10 . The linear compressor according to  claim 1 , wherein the pump housing has a pipe, whose one end is connected with the piston rod, immersing together with the suction opening in the oil sump, the normal to the surface of the suction opening having a component, which is parallel to the movement direction of the first component group.  
   
   
       11 . The linear compressor according to  claim 10 , wherein the normal to the surface is parallel to the movement direction.  
   
   
       12 . The linear compressor according to  claim 10 , wherein the pump housing has two suction openings in the oil sump, the normals to the surfaces of the suction openings each having a component, which is parallel to the movement direction of the first component group, the components having opposite directions.  
   
   
       13 . The linear compressor according to  claim 12 , wherein a blocking element is located between the two suction openings, said blocking element preventing a straight flow of oil from one suction opening to the other.  
   
   
       14 . The linear compressor according to  claim 13 , wherein the blocking element is movable.  
   
   
       15 . The linear compressor according to  claim 14 , wherein the blocking element exists in the form of a valve element, which is movable between a first valve seat that is allocated to one suction opening and a second valve seat that is allocated to the other suction opening.  
   
   
       16 . The linear compressor according to  claim 13 , wherein each suction opening is closed by a spring element, which can be opened by the available oil pressure.  
   
   
       17 . The linear compressor according to  claim 16 , wherein both spring elements are formed by a common spring ring.