Gate rotor and screw compressor

Abstract

The present invention provides a screw compressor wherein, even if a gate rotor flexes owing to a temperature differential between a casing and a screw rotor during operation of a compressor, the gate rotor is prevented, with a simple configuration, from biting into the screw rotor, which reduces the amount of wear of the gate rotor and prevents a decline in the compressor's performance. The gate rotor ( 3 ) comprises a gate rotor main body ( 30 ) and a shaft ( 40 ) to which the gate rotor main body ( 30 ) is attached. An elastic body ( 5 ) is disposed between (S) the axle ( 41 ) of the shaft ( 40 ) and the hole ( 32 ) of the gate rotor main body ( 30 ).

1 . A gate rotor, comprising:
 a gate rotor main body; and   a shaft with the gate rotor main body attached thereto,   the gate rotor main body including a plurality of teeth and a central hole,   the shaft including a pedestal supporting the gate rotor main body on a surface of the pedestal, and an axle installed on the surface of the pedestal and inserted in the central hole, with   an elastic body being disposed between the axle of the shaft and the central hole of the gate rotor main body.   
     
     
         2 . The gate rotor according to  claim 1 , wherein the elastic body is a leaf spring. 
     
     
         3 . The gate rotor according to  claim 2 , wherein the leaf spring is an annular wave spring or a spiral spring. 
     
     
         4 . The gate rotor according to  claim 1 , wherein the elastic body is an annular rubber member. 
     
     
         5 . A screw compressor including the gate rotor according to  claim 1 , the screw compressor further comprising:
 a casing including a cylinder; and   a cylindrical screw rotor meshing with the cylinder and the gate rotor,   the teeth of the gate rotor main body of the gate rotor meshing with the screw rotor, and   the shaft of the gate rotor being supported by the casing.   
     
     
         6 . A screw compressor, comprising:
 a rotatable screw rotor having a plurality of helical grooves formed in an outer circumferential surface of the screw rotor;   a gate rotor having an opening formed at a center thereof, and a plurality of teeth meshing with the helical grooves of the screw rotor, the teeth being radially disposed around the opening;   a gate rotor shaft inserted in the opening of the gate rotor such that a gap is formed between the gate rotor shaft and the opening; and   at least one of
 a first elastic body disposed in the gap, and 
 a second elastic body disposed around at least one of a plurality of locking pins, the locking pins being configured and arranged to stop the rotation of the gate rotor around the gate rotor shaft. 
   
     
     
         7 . The screw compressor according to  claim 6 , wherein
 the first elastic body is disposed in the gap, and provides an elastic force in radial directions of the gate rotor toward one of the plurality of locking pins.   
     
     
         8 . The screw compressor according to  claim 6 , wherein
 the first elastic body is disposed in the gap, and is ring-shaped and fills the entire gap.   
     
     
         9 . The screw compressor according to  claim 6 , wherein
 one of the plurality of locking pins is a floating pin connecting the gate rotor shaft and the gate rotor with more play therebetween than an amount of play between the other locking pins and the gate rotor.   
     
     
         10 . A The screw compressor according to  claim 9 , wherein
 the second elastic body is disposed around the floating pin, and is ring-shaped.   
     
     
         11 . A screw compressor including the gate rotor according to  claim 2 , the screw compressor further comprising:
 a casing including a cylinder; and   a cylindrical screw rotor meshing with the cylinder and the gate rotor,   the teeth of the gate rotor main body of the gate rotor meshing with the screw rotor, and   the shaft of the gate rotor being supported by the casing.   
     
     
         12 . A screw compressor including the gate rotor according to  claim 3 , the screw compressor further comprising:
 a casing including a cylinder; and   a cylindrical screw rotor meshing with the cylinder and the gate rotor,   the teeth of the gate rotor main body of the gate rotor meshing with the screw rotor, and   the shaft of the gate rotor being supported by the casing.   
     
     
         13 . A screw compressor including the gate rotor according to  claim 4 , the screw compressor further comprising:
 a casing including a cylinder; and   a cylindrical screw rotor meshing with the cylinder and the gate rotor,   the teeth of the gate rotor main body of the gate rotor meshing with the screw rotor, and   the shaft of the gate rotor being supported by the casing.   
     
     
         14 . The screw compressor according to  claim 7 , wherein
 one of the plurality of locking pins is a floating pin connecting the gate rotor shaft and the gate rotor with more play therebetween than an amount of play between the other locking pins and the gate rotor.   
     
     
         15 . The screw compressor according to  claim 14 , wherein
 the second elastic body is disposed around the floating pin, and is ring-shaped.   
     
     
         16 . The screw compressor according to  claim 8 , wherein
 one of the plurality of locking pins is a floating pin connecting the gate rotor shaft and the gate rotor with more play therebetween than an amount of play between the other locking pins and the gate rotor.   
     
     
         17 . The screw compressor according to  claim 16 , wherein
 the second elastic body is disposed around the floating pin, and is ring-shaped.