Centrifugal compressor and air conditioning equipment

1. A centrifugal compressor, comprising:

a shell;

a radial bearing;

a main shaft;

a diffuser, provided with a first thrust bearing at one end away from a diffusion surface;

a supporting assembly, provided with a second thrust bearing at one end facing towards the diffuser; and

a thrust disk, configured to rotate together with the main shaft, located between the diffuser and the supporting assembly along an axial direction and provided with a thrust portion, and a clearance between one side of the thrust portion and the first thrust bearing and a clearance between the other side of the thrust portion and the second thrust bearing are limited through mutual abutting of the diffuser and the supporting assembly;

wherein the supporting assembly comprises:

a fixing plate, provided with the second thrust bearing on one side facing towards the diffuser, a locating ring is arranged at one end, facing towards the bearing support, of the fixing plate; and

a bearing support, arranged on one side, away from the diffuser, of the fixing plate, a first end of the bearing support being connected to the fixing plate, and a second end of the bearing support being connected to the shell and configured to support the main shaft through the radial bearing; the bearing support is provided with an annular second groove, the locating ring is arranged into the second groove, and an inner wall of the locating ring engages with an outer wall of a partial length section of the radial bearing,

wherein a first groove is formed at one end, away from the diffusion surface, of the diffuser, the first thrust bearing is arranged at the bottom of the first groove along the axial direction, and the thrust portion is located in the first groove, and

wherein the clearance of the thrust bearings on two sides of the thrust portion is controlled by the thickness of the first groove.

2. The centrifugal compressor according to claim 1 , wherein the fixing plate and the bearing support form an integrated structure.

3. The centrifugal compressor according to claim 1 , wherein the fixing plate is configured to limit a displacement of the radial bearing towards one side of the diffuser along the axial direction.

4. The centrifugal compressor according to claim 1 , wherein the first end of the bearing support abuts against the diffuser.

5. The centrifugal compressor according to claim 1 , the bearing support being provided with a vent hole configured to communicate a space where the radial bearing is located with a space where the first thrust bearing and the second thrust bearing are located, such that a working environment of the radial bearing is consistent with those of the first thrust bearing and the second thrust bearing, such that a working environment of the radial bearing is consistent with those of the first thrust bearing and the second thrust bearing.

6. The centrifugal compressor according to claim 1 , further comprising an impeller and a locking part, wherein the main shaft is internally provided with a cavity and is provided with a shaft core at the center, an end of the shaft core extending out of an end of the main shaft; and the impeller sleeves an outer end of the shaft core and locks the impeller on the shaft core through the locking part, and the impeller is located on an outer side of the diffuser.

7. The centrifugal compressor according to claim 1 , wherein the thrust disk further comprises a connection portion, the connection portion being connected to the thrust portion and sleeving the main shaft; and a through hole is provided at the bottom of the first groove, and the connection portion is arranged into the through hole.

8. The centrifugal compressor according to claim 7 , further comprising a sealing structure and an impeller arranged on an end of the main shaft, wherein the impeller is located on an outer side of the diffuser, and the sealing structure adopts at least one of the following structures:

a first axial comb-tooth sealing structure, arranged on a side wall of the through hole;

a radial comb-tooth sealing structure, arranged on an end, facing towards the diffuser, of the impeller; and

a second axial comb-tooth sealing structure, wherein the impeller is provided with a protruding portion arranged into the diffuser, and the second axial comb-tooth sealing structure is arranged on the protruding portion along the axial direction.

9. The centrifugal compressor according to claim 8 , wherein the sealing structure comprises: the first axial comb-tooth sealing structure, the radial comb-tooth sealing structure and the second axial comb-tooth sealing structure, and the radial comb-tooth sealing structure being located between the first axial comb-tooth sealing structure and the second axial comb-tooth sealing structure along a radial direction.

10. The centrifugal compressor according to claim 1 , wherein at least one of the first thrust bearing, the second thrust bearing, or the radial bearing is an air-suspending bearing.

11. Air conditioning equipment, comprising the centrifugal compressor according to claim 1 .

12. The centrifugal compressor according to claim 1 , wherein the first end of the bearing support abuts against the diffuser, and radial outline dimensions of the bearing support gradually increase from the first end to the second end thereof.

13. The centrifugal compressor according to claim 2 , wherein the fixing plate is configured to limit a displacement of the radial bearing towards one side of the diffuser along the axial direction.