Linear compressor

Abstract

Disclosed herein is a linear compressor. In the present invention, an initial value control nut for controlling an initial position of a piston and a releasing protection nut for preventing the initial value control nut from releasing are combined in a bolt of a stator cover as a double nut method. The initial value control nut and the releasing protection nut are wound in the opposite direction. Therefore, it can prevent the initial value control nut from releasing, and can prevent the linear compressor from breaking down, thus improving the durability and the reliability.

1 . A linear compressor comprising: 
 a stator cover fastened to a linear motor;    a back cover spaced apart from the stator cover by predetermined distance;    a piston which linearly reciprocates by the linear motor;    a spring supporting member installed between the stator cover and the back cover, so as to gear with the piston;    a main spring mounted between the spring supporting member and the back cover to elastically hold linear reciprocation of the piston;    a connection device equipped in the stator cover to penetrate the spring supporting member and the back cover;    an initial value control device combined with the connection device in a rear of the back cover, so as to control an initial position of the piston; and    a releasing protection device combined with the connection device, so as to prevent the initial value control device from releasing.    
   
   
       2 . The linear compressor as set forth in  claim 1 , wherein the connection device is a bolt protruded in the stator cover toward the back cover and provided with a screw thread.  
   
   
       3 . The linear compressor as set forth in  claim 2 , wherein the initial value control device is an initial value control nut combined with the bolt by screwing.  
   
   
       4 . The linear compressor as set forth in  claim 3 , wherein the releasing protection device is a releasing protection nut combined with the bolt by screwing, said bolt being combined with the initial value control nut.  
   
   
       5 . The linear compressor as set forth in  claim 4 , wherein either the initial value control nut or the releasing protection nut is a right screw, and the rest is a left screw.  
   
   
       6 . The linear compressor as set forth in  claim 4 , wherein the bolt includes a rod penetrating the spring supporting member, a main screw prolonged from the rod and provided with the screw thread to combine with the initial value control nut, and a subsidiary screw prolonged from the main screw and provided with the screw thread to combine with the releasing protection nut.  
   
   
       7 . The linear compressor as set forth in  claim 6 , wherein the main screw and the subsidiary screw have a different diameter.  
   
   
       8 . The linear compressor as set forth in  claim 7 , wherein the main spring further includes a spring arranged between the spring supporting member and the stator cover to elastically support linear reciprocation of the piston.  
   
   
       9 . A linear compressor comprising: 
 a stator cover fastened to a linear motor;    a back cover spaced apart from the stator cover by predetermined distance;    a piston which linearly reciprocates by the linear motor;    a spring supporting member installed between the stator cover and the back cover, so as to gear with the piston;    a main spring mounted between the spring supporting member and the back cover to elastically hold linear reciprocation of the piston;    a connection device equipped in the stator cover to penetrate the spring supporting member and the back cover;    an initial value control device combined with the connection device between the main spring and the back cover, so as to control an initial position of the piston; and    a fixing device which allows the connection device and the back cover to be fastened to each other in a rear of the back cover.    
   
   
       10 . The linear compressor as set forth in  claim 9 , wherein the connection device is a bolt protruded in the stator cover toward the back cover and provided with a screw thread.  
   
   
       11 . The linear compressor as set forth in  claim 10 , wherein the fixing device is a lock nut combined with the bolt in the rear of the back cover.  
   
   
       12 . The linear compressor as set forth in  claim 11 , wherein the initial value control device is an initial value control nut combined with the bolt by screwing, between the main spring and a front of the back cover.  
   
   
       13 . The linear compressor as set forth in  claim 12 , wherein the initial value control nut includes a connection portion combined with the bolt, and a sheet portion radially protruded in the connection portion to support the main spring.  
   
   
       14 . The linear compressor as set forth in  claim 13 , wherein the bolt includes a rod penetrating the spring supporting member, a screw prolonged from the rod and provided with the screw thread to combine with the initial value control nut and the lock nut.  
   
   
       15 . The linear compressor as set forth in  claim 14 , wherein the main spring further includes a spring arranged between the spring supporting member and the stator cover to elastically support linear reciprocation of the piston.  
   
   
       16 . A linear compressor comprising: 
 a stator cover fastened to a linear motor;    a back cover spaced apart from the stator cover by predetermined distance;    a piston which linearly reciprocates by the linear motor;    a spring supporting member installed between the stator cover and the back cover, so as to gear with the piston;    a main spring mounted between the spring supporting member and the back cover to elastically hold linear reciprocation of the piston;    a connection device equipped in the stator cover to penetrate the spring supporting member and the back cover;    an initial value control device combined with the connection device by being placed in the main spring, so as to control an initial position of the piston; and    a fixing device which allows the connection device and the back cover to be fastened to each other in a rear of the back cover.    
   
   
       17 . The linear compressor as set forth in  claim 16 , wherein the connection device is a bolt protruded in the stator cover toward the back cover and provided with a screw thread.  
   
   
       18 . The linear compressor as set forth in  claim 17 , wherein an outside diameter of the initial value control device is smaller than an inside diameter of the main spring, said initial value control device being an initial value control nut combined with the bolt by screwing.  
   
   
       19 . The linear compressor as set forth in  claim 18 , wherein the fixing device is a lock nut combined with the bolt in the rear of the back cover.  
   
   
       20 . The linear compressor as set forth in  claim 19 , wherein the main spring further includes a spring arranged between the spring supporting member and the stator cover to elastically support linear reciprocation of the piston.