Back-gap controlling apparatus for compressor

Abstract

A back-gap controlling apparatus for compressor is proposed to reduce an initial torque for the motor of a compressor. A high pressure between the two scroll units of the compressor can temporarily separate the two scroll units. The casing pro se or a sealing buffer can be used to limit a displacement amount of the scroll unit The excessive displacement of scroll unit can be prevented to enhance lifetime of motor.

1 . A back-gap controlling apparatus for a compressor, comprising: 
 a casing comprising an accommodation space therein;    an orbital scroll arranged in the accommodation space; and    a fixed scroll arranged in the accommodation space and engaged with the orbital scroll;    wherein a compressed fluid pressure due to an operation between the orbital scroll and the fixed scroll will push the fixed scroll away from the orbital scroll; and    wherein an abutting section to limit a displacement amount of the fixed scroll is provided between the casing and the fixed scroll.    
   
   
       2 . The back-gap controlling apparatus for the compressor as in  claim 1 , wherein the casing comprises a first shell and a second shell connected to a bottom of the first shell and a floating oil seal is provided atop the fixed scroll.  
   
   
       3 . The back-gap controlling apparatus for the compressor as in  claim 2 , wherein an inner diameter of the first shell is equivalent to an inner diameter of the second shell, the abutting section is a baffle plate arranged within the first shell and placed atop the fixed scroll and the floating oil seal.  
   
   
       4 . The back-gap controlling apparatus for the compressor as in  claim 2 , wherein an inner diameter of the first shell is smaller than an inner diameter of the second shell, the abutting section is a baffle plate arranged within the first shell and placed atop the fixed scroll and the floating oil seal.  
   
   
       5 . The back-gap controlling apparatus for the compressor as in  claim 2 , wherein an inner diameter of the first shell is smaller than an inner diameter of the second shell, the abutting section is directly formed on bottom peripheral of the first casing.  
   
   
       6 . The back-gap controlling apparatus for the compressor as in  claim 5 , further comprising a sealing buffer at a junction between a first shell and a second shell.  
   
   
       7 . The back-gap controlling apparatus for the compressor as in  claim 6 , wherein the sealing buffer is of annulus shape and has an inner diameter the same as an inner diameter of the first shell.  
   
   
       8 . The back-gap controlling apparatus for the compressor as in  claim 6 , wherein the sealing buffer is of annulus shape and has an inner diameter the same as an inner diameter of the second shell.  
   
   
       9 . The back-gap controlling apparatus for the compressor as in  claim 6 , wherein the sealing buffer is of annulus shape and has an inner diameter smaller than an inner diameter of the first shell and larger than an inner diameter of the second shell.