Compressor with thermal expansion reducing structure

Patent metadata

Field	Value
Publication number	US-11525449-B2
Application number	US-201816627455-A
Country	US
Kind code	B2
Filing date	Jun 13, 2018
Priority date	Jun 28, 2017
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

The invention relates to a compressor machine ( 10; 10 a ), in particular a generator or a compressor unit for compressing a gas, comprising a shaft ( 12 ) which is arranged in a housing ( 18 ) so as to be able to rotate about a longitudinal axis ( 11 ) and which is mounted in at least two radial bearings ( 20, 22 ) and a thrust bearing ( 24 ), the radial bearings ( 20, 22 ) and/or the thrust bearing ( 24 ) being in the form of an aerodynamic or aerostatic bearing, the shaft ( 12 ) being at least indirectly connected to a compressor stage ( 15 ) or driving stage comprising an impeller wheel ( 13 ).

First claim

The invention claimed is:

1. A compressor machine ( 10 ; 10 a ) having a shaft ( 12 ) which is arranged in a housing ( 18 ) so as to be able to rotate about a longitudinal axis ( 11 ), wherein the shaft is mounted in at least two radial bearings ( 20 , 22 ) and one thrust bearing ( 24 ), wherein the radial bearings ( 20 , 22 ) and/or the thrust bearing ( 24 ) are an aerodynamic or aerostatic bearing, and wherein the shaft ( 12 ) is connected at least indirectly to a compressor stage ( 15 ) or a driving stage comprising an impeller wheel ( 13 ), further comprising reduction means ( 34 , 46 ) for reducing the thermal expansion of the shaft ( 12 ) in the housing ( 18 ) in a direction of the longitudinal axis ( 11 ), further comprising magnetic elements ( 28 ) fastened to the shaft ( 12 ) and a stator ( 30 ) interacting with the magnetic elements ( 28 ), wherein the reduction means ( 34 , 46 ) include first means ( 34 ) for heat flow from the shaft ( 12 ) to surroundings, and wherein the first means ( 34 ) comprise a structurizing ( 42 ) of a surface of the stator ( 30 ) facing the magnetic elements ( 28 ) such that heat transfers from the magnetic elements ( 28 ) and the stator ( 30 ).

2. The compressor machine according to claim 1 , characterized in that the first means ( 34 ) further comprise a device ( 36 ) for cooling the stator ( 30 ).

3. The compressor machine according to claim 1 , characterized in that the first means ( 34 ) further comprise a structurizing ( 44 ) of the magnetic elements ( 28 ) fastened to the shaft ( 12 ) such that the heat transfers from the magnetic elements ( 28 ) to the stator ( 30 ).

4. The compressor machine according to claim 1 , characterized in that the reduction means comprise second means ( 46 ) for at least indirect cooling of the shaft ( 12 ) by means of gas.

5. The compressor machine according to claim 4 , characterized in that the second means ( 46 ) involve a supplying of gas to the shaft that has been compressed from the region of the at least one compressor stage ( 15 ) or driving stage.

6. The compressor machine according to claim 5 , characterized in that the second means ( 46 ) are additionally configured to supply the compressed gas and/or the leakage air and/or the leakage gas to structural parts which can be heated at least indirectly by the shaft ( 12 ).

7. The compressor machine according to claim 4 , characterized in that the second means ( 46 ) involve a supplying of leakage air accruing in the region of the radial bearings ( 20 , 22 ) and/or the thrust bearing ( 24 ), to the shaft ( 12 ) or into the region of an air gap ( 32 ) between the shaft ( 12 ) and the stator ( 30 ).

8. The compressor machine according to claim 4 , characterized in that the second means ( 46 ) involve a supplying of gas or air accruing in the region of the compressor machine ( 10 ; 10 a ) radially outside the radial bearings ( 20 , 22 ) and/or outside the thrust bearing ( 24 ), to the shaft ( 12 ) or into the region of an air gap ( 32 ) between the shaft ( 12 ) and the stator ( 30 ).

9. The compressor machine according to claim 1 , characterized in that the compressor machine ( 10 ; 10 a ) is a compressor unit for gas.

10. The compressor machine according to claim 1 , characterized in that the reduction means comprise second means ( 46 ) for at least indirect cooling of the shaft ( 12 ) by means of air.

11. A compressor machine ( 10 ; 10 a ) having a shaft ( 12 ) which is arranged in a housing ( 18 ) so as to be able to rotate about a longitudinal axis ( 11 ), wherein the shaft is mounted in at least two radial bearings ( 20 , 22 ) and one thrust bearing ( 24 ), wherein the radial bearings ( 20 , 22 ) and/or the thrust bearing ( 24 ) are an aerodynamic or aerostatic bearing, and wherein the shaft ( 12 ) is connected at least indirectly to a compressor stage ( 15 ) or a driving stage comprising an impeller wheel ( 13 ), further comprising reduction means ( 34 , 46 ) for reducing the thermal expansion of the shaft ( 12 ) in the housing ( 18 ) in a direction of the longitudinal axis ( 11 ), wherein the reduction means include first means ( 34 ) for cooling a motor ( 26 ) or generator arranged in the housing ( 18 ) and connected to the shaft ( 12 ) such that heat flows from the shaft ( 12 ) to surroundings, wherein the reduction means comprise second means ( 46 ) for at least indirect cooling of the shaft ( 12 ) by means of gas, wherein the second means ( 46 ) involve a supplying of gas to the shaft that has been compressed from the region of the at least one compressor stage ( 15 ) or driving stage, and wherein the second means ( 46 ) involve a supplying of gas or air accruing in the region of the compressor machine ( 10 ; 10 a ) radially outside the radial bearings ( 20 , 22 ) and/or outside the thrust bearing ( 24 ), to the shaft ( 12 ) or into the region of an air gap ( 32 ) between the shaft ( 12 ) and a stator ( 30 ), further comprising magnetic elements ( 28 ) fastened to the shaft ( 12 ) and the stator ( 30 ) interacting with the magnetic elements ( 28 ), wherein the first means ( 34 ) comprise a structurizing ( 42 ) of a surface of the stator ( 30 ) facing the magnetic elements ( 28 ) such that heat transfers from the magnetic elements ( 28 ) and the stator ( 30 ).

12. The compressor machine according to claim 11 , characterized in that the first means ( 34 ) comprise a device ( 36 ) for cooling the stator ( 30 ).

13. The compressor machine according to claim 11 , characterized in that the first means ( 34 ) comprise a structurizing ( 42 , 44 ) surfaces of the magnetic elements ( 28 ) fastened to the shaft ( 12 ) and/or surfaces of the stator ( 30 ) interacting with the magnetic elements ( 28 ) such that heat transfers from the magnetic elements ( 28 ) to the stator ( 30 ).

14. The compressor machine according to claim 13 , characterized in that the second means ( 46 ) involve a supplying of leakage air accruing in the region of the radial bearings ( 20 , 22 ) and/or the thrust bearing ( 24 ), to the shaft ( 12 ) or into the region of the air gap ( 32 ) between the shaft ( 12 ) and the stator ( 30 ).

15. The compressor machine according to claim 14 , characterized in that the second means ( 46 ) is additionally configured to supply the compressed gas and/or the leakage air and/or the leakage gas to structural parts which can be heated at least indirectly by the shaft ( 12 ).

16. The compressor machine according to claim 11 , characterized in that the compressor machine ( 10 ; 10 a ) is a compressor unit for gas.

17. The compressor machine according to claim 11 , characterized in that the reduction means comprise second means ( 46 ) for at least indirect cooling of the shaft ( 12 ) by means of air.

Assignees

• Bosch Gmbh Robert

Inventors

• Derhardt Steffen
• Rachow Thomas

Classifications

• H02K9/00

  Arrangements for cooling or ventilating (channels or ducts in parts of the magnetic circuit H02K1/20, H02K1/32; channels or ducts in or between conductors H02K3/22, H02K3/24) · CPC title

• F04D29/057

  hydrostatic; hydrodynamic · CPC title

• F04D29/0513

  hydrostatic; hydrodynamic thrust bearings · CPC title

• F05D2260/205

  Cooling fluid recirculation, i.e. after cooling one or more components is the cooling fluid recovered and used elsewhere for other purposes · CPC title

• F04D25/06

  the pump being electrically driven (F04D25/08 takes precedence) · CPC title