Linear compressor

Abstract

The present invention provides a linear compressor having an elastic body capable of reducing vibration transferred to a shell due to a motion of a moving part. The linear compressor includes a shell defining a hermetic space, a stationary part installed in the shell and having a mass of M b , a moving part reciprocating linearly inside the stationary part at a frequency of ω to compress a fluid, and having a mass of M a , a first elastic body having both ends supported on the moving part and the shell respectively, and having an spring constant of k a , a second elastic body having both ends supported on the shell and the stationary part respectively, and having an spring constant of k b , and a third elastic body having both ends supported on the stationary part and the moving part respectively, and having an spring constant of k. The frequency ω satisfies ω 2 >(k a /M a ). In the above configuration, the spring constant k c of the third elastic body is always a positive number, so that the third elastic body can be implemented with a mechanical elastic body more easily designed and controlled than a gas elastic body.

1 . A linear compressor, comprising:
 a shell defining a hermetic space;   a stationary part installed in the shell and having a mass of M b ;   a moving part reciprocating linearly inside the stationary part at a frequency of ω to compress a fluid, and having a mass of M a ;   a first elastic body having both ends supported by the moving part and the shell respectively, and having an spring constant of k a ;   a second elastic body having both ends supported by the shell and the stationary part respectively, and having an spring constant of k b ; and   a third elastic body having both ends supported by the stationary part and the moving part respectively, and having an spring constant of k c ,   wherein the frequency ω satisfies   
     
       
         
           
             
               ω 
               2 
             
             > 
             
               
                 
                   k 
                   a 
                 
                 
                   M 
                   a 
                 
               
               . 
             
           
         
       
     
   
   
       2 . The linear compressor of  claim 1 , wherein the first and second elastic bodies satisfy 
     
       
         
           
             
               
                 k 
                 b 
               
               
                 k 
                 a 
               
             
             = 
             
               
                 
                   M 
                   b 
                 
                 
                   M 
                   a 
                 
               
               . 
             
           
         
       
     
   
   
       3 . The linear compressor of  claim 1 , wherein the spring constant k c  of the third elastic body satisfies 
     
       
         
           
             
               
                 k 
                 c 
               
               = 
               
                 
                   
                     M 
                     a 
                   
                   
                     M 
                     
                       a 
                       + 
                       
                         M 
                         b 
                       
                     
                   
                 
                  
                 
                   ( 
                   
                     
                       
                         M 
                         a 
                       
                       · 
                       
                         ω 
                         2 
                       
                     
                     - 
                     
                       k 
                       a 
                     
                   
                   ) 
                 
               
             
             , 
           
         
       
     
     so as to make the moving part resonate. 
   
   
       4 . The linear compressor of  claim 1 , wherein the frequency ω is a resonance frequency ω cr  of the moving part. 
   
   
       5 . The linear compressor of  claim 1 , wherein the third elastic body is a mechanical elastic body. 
   
   
       6 . A linear compressor, comprising:
 a shell defining a hermetic space;   a stationary part installed in the shell and having a mass of M b ;   a moving part reciprocating linearly inside the stationary part at a frequency of ω to compress a fluid, and having a mass of M a ;   a first elastic body having both ends supported on the moving part and the shell respectively, and having an spring constant of k a ;   a second elastic body having both ends supported on the shell and the stationary part respectively, and having an spring constant of k b ; and   a third elastic body having both ends supported on the stationary part and the moving part respectively, and having an spring constant of k c ,   wherein the spring constant k c  of the third elastic body satisfies   
     
       
         
           
             
               k 
               c 
             
             = 
             
               
                 
                   M 
                   a 
                 
                 
                   M 
                   
                     a 
                     + 
                     
                       M 
                       b 
                     
                   
                 
               
                
               
                 ( 
                 
                   
                     
                       M 
                       a 
                     
                     · 
                     
                       ω 
                       2 
                     
                   
                   - 
                   
                     k 
                     a 
                   
                 
                 ) 
               
             
           
         
       
     
   
   
       7 . The linear compressor of  claim 6 , wherein the first and second elastic bodies satisfy 
     
       
         
           
             
               
                 k 
                 b 
               
               
                 k 
                 a 
               
             
             = 
             
               
                 
                   M 
                   b 
                 
                 
                   M 
                   a 
                 
               
               .