Fluid Machine

Abstract

Provided is a fluid machine which can be produced with a reduced weight and size at a reduced production cost. The fluid machine ( 1 ) comprises a drive unit ( 4 ) and a driven unit ( 6 ) arranged in a hermetic container ( 2 ) such that drive power is transmitted from the drive unit to the driven unit, the hermetic container ( 2 ) including a first shell ( 78 ) covering the drive unit ( 4 ) and a second shell ( 80 ) covering the driven unit ( 6 ) and joined to the first shell ( 78 ), wherein the first and second shells ( 78, 80 ) are members formed by different working processes.

1 . A fluid machine comprising a drive unit and a driven unit arranged in a hermetic container such that drive power is transmitted from the drive unit to the driven unit, the hermetic container including a first shell covering the drive unit and a second shell covering the driven unit and joined to the first shell, wherein
 the first and second shells are members formed by different working processes.   
     
     
         2 . The fluid machine according to  claim 1 , wherein the first shell is a forged member and the second shell is a press-formed member. 
     
     
         3 . The fluid machine according to  claim 1 , wherein the first shell is a press-formed member and the second shell is a forged member. 
     
     
         4 . The fluid machine according to  claim 3 , wherein the drive unit is arranged in the first shell with its length aligned with a depth of the first shell, and the driven unit is arranged in the second shell with its length aligned with a diameter of the second shell. 
     
     
         5 . The fluid machine according to  claim 4 , wherein the second shell has a holding portion by which to hold the second shell during forging of the second shell, the holding portion forming a crest of the second shell projecting outward in a central region radially away from a side wall of the second shell. 
     
     
         6 . The fluid machine according to  claim 5 , wherein the second shell has a lubricating system configured to supply a lubricant collecting in an inner bottom portion of the second shell to sliding parts of the drive unit and of the driven unit, wherein said inner bottom portion is a recess defined by an inner side of said holing portion and having a shape approximately similar to an outer shape of said holding portion and serving as an oil reservoir. 
     
     
         7 . The fluid machine according to  claim 6 , wherein the second shell has a support portion for the drive unit and the driven unit to be fixed to. 
     
     
         8 . The fluid machine according to  claim 7 , wherein the holding portion, the oil reservoir and the support portion are parts formed all at once when the second shell is forged. 
     
     
         9 . The fluid machine according to  claim 1 , wherein the hermetic container undergoes pressure exerted by a working fluid sucked in and discharged from the driven unit, the working fluid being carbon-dioxide refrigerant.