Vane compressor

Abstract

A rotor of a vane compressor includes vanes that reciprocates in vane slots, coil springs that urge the vanes, and guide members each having a press-in end pressed into the vane and an accommodated end and inserted into the coil spring. When an outer diameter of the guide member is a, an inner diameter of the coil spring is b1, an outer diameter thereof is b2, and an inner diameter an accommodation hole for the coil spring is c, (b1−a)<(c−b2) is satisfied. A diameter of an end (a first contact portion) of the coil spring on a side of the accommodated end is larger than a diameter of another end (a second contact portion) thereof on a side of the press-in end. According to the compressor, contacts between the accommodation hole and the guide member can be prevented without high accuracy forming of the accommodation hole.

1 . A vane compressor comprising:
 a cylinder block in which a cylinder chamber having an oval inner wall on an inner surface thereof is formed; and   a rotor rotatably provided in the cylinder chamber, wherein   the rotor includes
 a rotor main body that rotates in the cylinder chamber, 
 a plurality of vanes whose base ends are supported by a plurality of vane slots formed in the rotor main body and that are provided so as to be able to protrude from the rotor main body, 
 coil springs disposed between bottoms of the vane slots and the vanes to urge the vanes toward the oval inner wall, and 
 guide members each of which has a press-in end that is pressed into a bottom of one of the vane and the vane slot and an accommodated end that is to be accommodated in an escape hole provided on a bottom of another of the vane and the vane slot, and is inserted into the coil spring to prevent the coil spring from bending, 
   when an outer diameter of the guide member is denoted by a, an inner diameter of the coil spring is denoted by b1, an outer diameter of the coil spring is denoted by b2, and an inner diameter or an inner width of an accommodation portion for the coil spring is denoted by c, an inequality (b1−a)<(c−b2) is satisfied, and   a first seating diameter of a first contact portion at an end of the coil spring on a side of the accommodated end is larger than a second seating diameter of a second contact portion at another end of the coil spring on a side of the press-in end.   
     
     
         2 . The vane compressor according to  claim 1 , wherein
 an outer diameter of the first contact portion is larger than an outer diameter of the second contact portion.   
     
     
         3 . The vane compressor according to  claim 2 , wherein
 the coil spring has a radially-enlarged portion whose outer diameter is gradually enlarged along a direction from the second contact portion to the first contact portion.   
     
     
         4 . The vane compressor according to  claim 3 , wherein
 the number of active coils in the radially-enlarged portion is set so that shear stress of the radially-enlarged portion of the coil spring is made equivalent-to or smaller-than shear stress of a coiled portion that is a portion of the coil spring other than the radially-enlarged portion.   
     
     
         5 . The vane compressor according to  claim 4 , wherein
 pitch of the radially-enlarged portion is smaller than pitch of the coiled portion.   
     
     
         6 . The vane compressor according to  claim 3 , wherein
 coils in the radially-enlarged portion are contacted with each other.   
     
     
         7 . The vane compressor according to  claim 1 , wherein
 the first contact portion has a washer, and   an outer diameter of the washer is the seating diameter.