Compressor

Abstract

A compressor includes a rotary shaft, a housing in which a suction port through which a suction fluid is drawn in and a discharge port through which a compression fluid is discharged are formed, and that houses the rotary shaft, and compression chambers. The suction fluid is drawn into the compression chambers. Respective volumes of the compression chambers are periodically changed with rotation of the rotary shaft. The phases of volume changes of the compression chambers are mutually shifted. The compressor includes a communication mechanism switched between a communicating state in which the compression chambers communicate with each other, and a non-communicating state in which the compression chambers do not communicate with each other.

1 . A compressor comprising:
 a rotary shaft;   a housing housing the rotary shaft and having a suction port through which a suction fluid is drawn in and a discharge port through which a compression fluid is discharged;   a first compression chamber and a second compression chamber formed to introduce therein the suction fluid, respective volumes of the first compression chamber and the second compression chamber being periodically changed with rotation of the rotary shaft, and phases of changes of the respective volumes being mutually shifted; and   a communication mechanism switched between a communicating state in which the first compression chamber and the second compression chamber communicate with each other, and a non-communicating state in which the first compression chamber and the second compression chamber do not communicate with each other,   wherein a cycle movement is performed that includes parallel compression operation in which compression of fluid is performed in the compression chambers in the communicating state.   
     
     
         2 . The compressor according to  claim 1 , wherein the first compression chamber and the second compression chamber are opposed to each other in the axial direction of the rotary shaft. 
     
     
         3 . The compressor according to  claim 1 , wherein the cycle movement includes
 a parallel suction operation in which a suction operation of the suction fluid into the compression chambers is performed, and   the parallel compression operation performed after the parallel suction operation.   
     
     
         4 . The compressor according to  claim 3 , wherein
 the cycle movement includes a communication intermediate operation performed between the parallel suction operation and the parallel compression operation, and   in the communication intermediate operation, under a circumstance where the communication mechanism is in the communicating state, a pumping operation moving the fluid in the first compression chamber to the second compression chamber with a volume decrease of the first compression chamber, and a suction operation of the suction fluid into the second compression chamber are performed.   
     
     
         5 . The compressor according to  claim 3 , wherein
 the cycle movement includes a non-communicating intermediate operation performed between the parallel suction operation and the parallel compression operation, and   in the non-communicating intermediate operation, under a circumstance where the communication mechanism is in the non-communicating state, a compression operation of the fluid in the first compression chamber and a suction operation of the suction fluid into the second compression chamber are performed.   
     
     
         6 . The compressor according to  claim 1 , further comprising:
 a first rotor including a ring-shaped first rotor surface, and rotated with rotation of the rotary shaft;   a second rotor opposed to the first rotor in an axial direction of the rotary shaft, rotated with the rotation of the rotary shaft, and including a ring-shaped second rotor surface;   a first cylindrical portion including a first inner circumferential surface opposed to an outer circumferential surface of the first rotor in a radial direction of the rotary shaft, and housing the first rotor;   a second cylindrical portion including a second inner circumferential surface opposed to an outer circumferential surface of the second rotor in the radial direction, and housing the second rotor;   a wall portion arranged between the rotors, and including a first wall surface opposed to the first rotor surface in the axial direction, and a second wall surface opposed to the second rotor surface in the axial direction; and   a vane contacting the rotor surfaces in a state where the vane is inserted into a vane groove formed in the wall portion, and moving in the axial direction with rotation of the rotors, wherein   the first rotor surface includes a first curving surface curved in the axial direction so as to be displaced in the axial direction in accordance with its angular position,   the second rotor surface includes a second curving surface curved in the axial direction so as to be displaced in the axial direction in accordance with its angular position,   the first compression chamber is formed by the first rotor surface, the first wall surface, and the first inner circumferential surface, the volume of the first compression chamber being changed by the vane with rotation of the first rotor,   the second compression chamber is formed by the second rotor surface, the second wall surface, and the second inner circumferential surface, the volume of the second compression chamber being changed by the vane with rotation of the second rotor,   the rotor surfaces are opposed to each other in the axial direction with the wall portion being arranged therebetween, and   a separation distance between the rotor surfaces including the curving surfaces is constant irrespective of their angular positions.   
     
     
         7 . The compressor according to  claim 6 , wherein
 the first rotor surface includes
 a first flat surface separated from the first wall surface in the axial direction, and perpendicular to the axial direction, and 
 a second flat surface that is a surface separated from the first flat surface in a circumferential direction, and perpendicular to the axial direction, and that contacts the first wall surface, and 
   the first curving surface connects the first flat surface with the second flat surface, and is curved in the axial direction so as to gradually approach the first wall surface from the first flat surface to the second flat surface.   
     
     
         8 . The compressor according to  claim 1 , wherein
 the cycle movement includes a first compression chamber suction operation performed before the parallel suction operation, and   in the first compression chamber suction operation, in a circumstance where the communication mechanism is in the non-communicating state, a suction operation of the suction fluid into the first compression chamber is performed, and a suction operation of the suction fluid into the second compression chamber is not performed.   
     
     
         9 . The compressor according to  claim 1 , wherein
 the cycle movement includes a second compression chamber compression operation performed after the parallel compression operation, and   in the second compression chamber compression operation, under a circumstance where the communication mechanism is in the non-communicating state, a compression operation of the fluid in the second compression chamber is performed, and a compression operation of the fluid in the first compression chamber is not performed.