Scroll machine and refrigeration system

Abstract

A scroll machine for a medium has a machine housing having a longitudinal axis and an inlet and an outlet for the medium. Provided in the machine housing along the longitudinal axis is: a drive unit having a drive shaft mounted on the machine housing by a first bearing unit and a second bearing unit, a first spiral unit having a spiral channel formed by a first spiral rib and has an inner end region and an outer end region, and a second spiral unit having a spiral channel formed by a second spiral rib and has an inner end region and an outer end region. The first spiral unit and the second spiral unit engage one another to form pressure chambers, wherein the first spiral unit can be moved by means of the drive shaft through the drive unit along an orbital path relative to the second spiral unit.

1 . A scroll machine ( 2 ) for a medium, comprising:
 a machine housing ( 10 ) having a longitudinal axis (X) and an inlet and an outlet for the medium, wherein, provided in the machine housing ( 10 ) along the longitudinal axis (X) is a drive unit ( 400 ) having a drive shaft ( 420 ) which is mounted on the machine housing ( 10 ) by a first bearing unit ( 450 ) and a second bearing unit ( 300 );   a first spiral unit ( 100 ) having a spiral channel ( 120 ) which is formed by a first spiral rib ( 110 ) and has an inner end region ( 125 ) and an outer end region ( 126 ), the first spiral unit ( 100 ) being provided in the machine housing ( 10 ); and   a second spiral unit ( 200 ) having a spiral channel ( 220 ) which is formed by a second spiral rib ( 210 ) and has an inner end region ( 225 ) and an outer end region ( 226 ), wherein the first spiral unit ( 100 ) and the second spiral unit ( 200 ) engage one another to form pressure chambers, and wherein the second spiral unit ( 200 ) is provided in the machine housing ( 10 ),   wherein the first spiral unit ( 100 ) is movable by means of the drive shaft ( 420 ) through the drive unit ( 400 ) along an orbital path relative to the second spiral unit ( 200 ),   wherein an inlet ( 11 ) is in fluid communication with the outer end regions ( 126 ,  226 ) of the first and second spiral units ( 100 ,  200 ) and an outlet ( 12 ) is in fluid communication with the inner end regions ( 125 ,  225 ) of the first and second spiral units ( 100 ,  200 ),   wherein the medium in the machine housing ( 10 ) flows along a plurality of flow paths from the inlet ( 11 ) to the outer end regions ( 126 ,  226 ) of the first and second spiral units ( 100 ,  200 ), and the drive shaft ( 420 ) has a hollow shaft portion ( 424 ) through which one of the flow paths extends, and,   wherein a high-pressure chamber ( 30 ) is arranged in the machine housing, in that the inner end regions ( 125 ,  225 ) are connected to the high-pressure chamber ( 30 ) via a passage ( 260 ) and are connected to the outlet ( 12 ) via the high-pressure chamber ( 30 ), and in that in the high-pressure chamber ( 30 ) a back-flow region ( 45 ) is provided which forces an S-shaped flow path in the high-pressure chamber ( 30 ).   
     
     
         2 . The scroll machine ( 2 ) according to  claim 1 , characterized in that an intermediate bottom ( 50 ) is provided between the high-pressure chamber ( 30 ) and the second spiral unit ( 200 ) and in that the back-flow region ( 45 ) is formed by a recess ( 59 ) formed in the intermediate bottom ( 50 ) on the side facing the high-pressure chamber ( 30 ) and by a pressure connection piece ( 40 ) projecting toward the recess ( 59 ).