Compressor

Abstract

A compressor includes a rotary shaft, a rotating body, which rotates together with the rotary shaft, and a fixed body, which does not rotate together with the rotary shaft. The rotating body has a rotating body surface, and the fixed body has a fixed body surface facing the rotating body surface in the axial direction. The compressor includes a vane, which is inserted in a vane groove provided in the rotating body, and a compression chamber, which is defined by the rotating body surface and the fixed body surface. The vane includes a vane body, which is inserted in the vane groove, and a tip seal, which is movable in the axial direction relative to the vane body.

What is claimed is: 
     
         1 . A compressor comprising:
 a rotary shaft;   a rotating body that is configured to rotate together with the rotary shaft and includes a rotating body surface, which intersects with an axial direction of the rotary shaft, and a vane groove and;   a fixed body that is configured not to rotate together with the rotary shaft and includes a fixed body surface, which faces the rotating body surface in the axial direction;   a vane that is inserted in the vane groove and configured to rotate together with the rotating body while moving in the axial direction; and   a compression chamber that is defined by the rotating body surface and the fixed body surface and in which suction and compression of fluid is performed when the vane rotates while moving in the axial direction, wherein   the vane includes
 a vane body inserted in the vane groove, and 
 a sealing member attached to an end face in the axial direction of the vane body so as to be movable in the axial direction relative to the vane body, 
   a back pressure space is located between the sealing member and the vane body, and   the sealing member is configured to be pressed by the back pressure space toward the fixed body surface so as to be in contact with the fixed body surface.   
     
     
         2 . The compressor according to  claim 1 , wherein
 the compression chamber includes
 a first part chamber located on a trailing side of the vane in a rotation direction of the rotating body, and 
 a second part chamber located on a leading side of the vane in the rotation direction, 
   the sealing member includes a seal attachment section attached to a body attachment section located in the end face of the vane body, and   the body attachment section and the seal attachment section face each other in a circumferential direction of the rotary shaft.   
     
     
         3 . The compressor according to  claim 2 , wherein
 the body attachment section is a body attachment groove that is located in the end face of the vane body, has a width in a thickness direction of the vane, and extends in a radial direction of the rotary shaft,   the body attachment groove includes a first body groove side surface and a second body groove side surface, which is on the leading side of the first body groove side surface in the rotation direction,   the sealing member includes a seal body that is in contact with the fixed body surface,   the seal attachment section is a seal attachment protrusion that protrudes from the seal body toward the end face of the vane body,   the seal attachment protrusion includes a first seal protrusion side surface and a second seal protrusion side surface, which is on the leading side of the first seal protrusion side surface in the rotation direction,   the seal attachment protrusion is inserted in the body attachment groove so that the sealing member is attached to the vane body, and   the first seal protrusion side surface and the first body groove side surface face each other in the circumferential direction.   
     
     
         4 . The compressor according to  claim 3 , wherein at least one of the vane body and the sealing member has an introduction groove configured to introduce fluid into the back pressure space from the second part chamber. 
     
     
         5 . The compressor according to  claim 3 , wherein
 the first body groove side surface is tilted with respect to the axial direction so as to be displaced gradually toward the leading side in the rotation direction as the body attachment groove deepens, and   the first seal protrusion side surface is tilted with respect to the axial direction so as to be displaced gradually toward the leading side in the rotation direction from a proximal end to a distal end of the seal attachment protrusion.   
     
     
         6 . The compressor according to  claim 3 , wherein
 the fixed body surface includes
 a fixed body contact surface that is in contact with the rotating body surface; and 
 two curved surfaces that are located on opposite sides of the fixed body contact surface in the circumferential direction and curved in the axial direction such that a distance to the rotating body surface gradually increases as the curved surfaces extend away from the fixed body contact surface in the circumferential direction, and 
   the body attachment groove and the seal attachment protrusion are closer to the first part chamber than to the second part chamber so that a side surface contact area, which is an area of contact between the first seal protrusion side surface and the first body groove side surface, is closer to the first part chamber than to the second part chamber.   
     
     
         7 . The compressor according to  claim 2 , wherein
 the sealing member is made of a material softer than the vane body,   the sealing member has a seal body that is in contact with the fixed body surface,   the seal body has a seal body bottom surface that faces the end face of the vane body,   the seal attachment section is a seal attachment groove recessed from the seal body bottom surface,   the body attachment section is a body attachment protrusion protruding from the end face of the vane body, and   the body attachment protrusion is inserted in the seal attachment groove so that the sealing member is attached to the vane body.   
     
     
         8 . The compressor according to  claim 7 , wherein
 the seal attachment groove includes a first seal groove side surface and a second seal groove side surface, which is located on the leading side of the first seal groove side surface in the rotation direction,   the body attachment protrusion includes a first body protrusion side surface and a second body protrusion side surface, which is located on the leading side of the first body protrusion side surface in the rotation direction,   the second seal groove side surface is tilted with respect to the axial direction so as to be displaced gradually toward the trailing side in the rotation direction as the seal attachment groove deepens,   the second body protrusion side surface is tilted with respect to the axial direction so as to be displaced gradually toward the trailing side from a proximal end to a distal end of the body attachment protrusion, and   the second body protrusion side surface and the second seal groove side surface face each other in the circumferential direction.