Fluid Machine

Abstract

A fluid machine ( 14, 102, 108 ) includes a plurality of fluid units ( 16, 20 ) each having a rotator ( 40, 66 ) and configured to let in and out a working fluid as the rotator ( 40, 66 ) rotates, and a drive shaft ( 72 ) to which the rotators ( 40, 66 ) of the fluid units ( 16, 20 ) are coupled, wherein an Oldham coupling ( 85 ) is arranged at a shaft section of the drive shaft ( 72 ) located between the rotators ( 40, 66 ).

1 . A fluid machine comprising:
 a plurality of fluid units each including a rotator and configured to let in and out a working fluid as the rotator rotates; and   a drive shaft to which the rotators of said plurality of fluid units are coupled,   wherein an Oldham coupling is arranged at a shaft section of the drive shaft located between the rotators.   
     
     
         2 . The fluid machine according to  claim 1 , wherein:
 the Oldham coupling includes a slider, the slider having an engaging portion for engagement with the shaft section and a body provided with the engaging portion, and   the slider is received in a receiving hole formed in the shaft section.   
     
     
         3 . The fluid machine according to  claim 2 , wherein said plurality of fluid units include an expansion unit, the expansion unit including a first rotator and configured such that as the first rotator rotates, the expansion unit admits the working fluid, then expands the working fluid, and delivers the expanded working fluid. 
     
     
         4 . The fluid machine according to  claim 2 , wherein said plurality of fluid units include a pump unit, the pump unit including a second rotator and configured such that as the second rotator rotates, the pump unit draws in the working fluid, then raises pressure of the working fluid, and discharges the working fluid. 
     
     
         5 . The fluid machine according to  claim 2 , wherein said plurality of fluid units include a compression unit, the compression unit including a third rotator and configured such that as the third rotator rotates, the compression unit draws in the working fluid, then compresses the working fluid, and delivers the compressed working fluid. 
     
     
         6 . The fluid machine according to  claim 2 , further comprising an electric power generation unit including a fourth rotator coupled to the drive shaft, wherein the electric power generation unit is configured to generate electric power as the fourth rotator rotates. 
     
     
         7 . The fluid machine according to  claim 2 , further comprising a power generation-drive unit including a fifth rotator coupled to the drive shaft, wherein the power generation-drive unit is configured to generate electric power as the 2fifth rotator rotates, and to drive the drive shaft when the fifth rotator is rotated by externally supplied electric power. 
     
     
         8 . The fluid machine according to  claim 2 , further comprising a motive power transmission unit coupled to the drive shaft and configured to transmit motive power between the drive shaft and an external device.