US 12,331,743 B2
Scroll machine with multiple flow paths for the inlet flow including in the hollow shaft portion
Markus Hauser, Rottenburg am Neckar-Oberndorf (DE); Christian Scharer, Gaggenau (DE); and Thomas Varga, Aildingen (DE)
Assigned to BITZER Kühlmaschinenbau GmbH, Sindelfingen (DE)
Filed by BITZER KUEHLMASCHINENBAU GMBH, Sindelfingen (DE)
Filed on Aug. 11, 2023, as Appl. No. 18/233,201.
Claims priority of application No. 102022120679.3 (DE), filed on Aug. 16, 2022.
Prior Publication US 2024/0060491 A1, Feb. 22, 2024
Int. Cl. F04C 18/02 (2006.01); F04C 29/02 (2006.01); F04C 29/04 (2006.01); F04C 29/12 (2006.01)
CPC F04C 18/0215 (2013.01) [F04C 29/02 (2013.01); F04C 29/04 (2013.01); F04C 29/12 (2013.01); F04C 2240/50 (2013.01); F04C 2240/603 (2013.01)] 24 Claims
OG exemplary drawing
 
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,
wherein a high-pressure chamber (30) is arranged in the machine housing (10), the inner end regions (125, 225) of the first and second spiral units (100, 200) being connected to the high-pressure chamber (30) via a passage (260), the inner end regions (125, 225) of the first and second spiral units (100, 200) being further connected to the outlet (12) via the high-pressure chamber (30), wherein the high-pressure chamber (30) is connected to the outlet (12) by a pressure connection piece,
wherein the pressure connection piece is arranged in a plane transverse to the longitudinal axis (X) and is offset with respect to the passage (260),
wherein the high-pressure chamber (30) includes a back-flow region (45) which forces an S-shaped flow path in the high-pressure chamber (30), and
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 the pressure connection piece (40) projecting toward the recess (59).