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EP-4155547-B1 - COMPRESSOR

EP4155547B1EP 4155547 B1EP4155547 B1EP 4155547B1EP-4155547-B1

Inventors

  • HU, YUSHENG
  • CHEN, BIN
  • ZHANG, XIAOBO
  • JIA, Jinxin
  • SU, Jiuzhan

Dates

Publication Date
20260506
Application Date
20210507

Claims (14)

  1. A compressor, comprising: a drive motor comprising a casing (2) and a rotor (3), the rotor (3) being rotatably arranged within the casing (2); a wind wheel (1) mounted at a first axial end of the rotor (3); a thrust disc (4), the thrust disc (4) being arranged at the first axial end of the rotor (3); and an axial bearing assembly (28) fixed to the casing (2), the axial bearing assembly (28) being arranged between the thrust disc (4) and the wind wheel (1), wherein a first air gap is formed between the axial bearing assembly (28) and the wind wheel (1), and a second air gap is formed between the axial bearing assembly (28) and the thrust disc (4); wherein the axial bearing assembly (28) comprises: an annular fixing seat (5) fixed to the casing (2); an annular bearing seat (6) arranged on an inner peripheral wall of the fixing seat (5); a first axial bearing (7) arranged at a first axial end of the bearing seat (6); and a second axial bearing (8) arranged at a second axial end of the bearing seat (6), wherein the first air gap is formed between the first axial bearing (7) and the wind wheel (1), and the second air gap is formed between the second axial bearing (8) and the thrust disc (4).
  2. The compressor according to claim 1, wherein an axial dimension of the bearing seat (6) is smaller than an axial dimension of the fixing seat (5), and the bearing seat (6) is located in the middle of the fixing seat (5) in the axial direction; and the first axial end of the bearing seat (6) and the inner peripheral wall of the fixing seat (5) form a first annular slot (9), and the first axial bearing (7) is mounted in the first annular slot (9).
  3. The compressor according to claim 2, wherein the wind wheel (1) is at least partially mounted into the first annular slot (9) and is in annular seal fit with the inner peripheral wall of the fixing seat (5).
  4. The compressor according to any one of claims 1 to 3, wherein the second axial end of the bearing seat (6) and the inner peripheral wall of the fixing seat (5) form a second annular slot (10), and the second axial bearing (8) is mounted in the second annular slot (10).
  5. The compressor according to claim 4, wherein the diameter of the thrust disc (4) is smaller than or equal to the diameter of the second annular slot (10), and the thrust disc (4) is at least partially mounted in the second annular slot (10).
  6. The compressor according to any one of claims 1 to 5, further comprising: a radial displacement sensor (11) arranged on the inner peripheral wall of the fixing seat (5), the radial displacement sensor (11) being configured to detect a radial displacement of the rotor (3) by detecting a radial displacement of the thrust disc (4).
  7. The compressor according to any one of claims 1 to 6, wherein the wind wheel (1) comprises an axial flange (12) projecting towards the thrust disc (4), and the thrust disc (4) comprises a first positioning surface (13) facing the axial bearing assembly (28); and the axial flange (12) is arranged on an inner peripheral side of the axial bearing assembly (28), and a positioning end side (14) of the axial flange (12) facing the thrust disc (4) abuts against the first positioning surface (13).
  8. The compressor according to any one of claims 1 to 7, further comprising: a mounting shaft (15) arranged at the first axial end of the rotor (3), the wind wheel (1) being mounted to the mounting shaft (15).
  9. The compressor according to claim 8, further comprising: a positioning boss (16) arranged at the first axial end of the rotor (3), wherein the mounting shaft (15) is located on the positioning boss (16); the diameter of the positioning boss (16) is smaller than the diameter of the rotor (3), and the diameter of the mounting shaft (15) is smaller than the diameter of the positioning boss (16); and the thrust disc (4) is mounted on the positioning boss (16), and an axial dimension of the positioning boss (16) is smaller than an axial dimension of the thrust disc (4).
  10. The compressor according to any one of claims 1 to 6, further comprising: a volute (17), the wind wheel (1) being enclosed by the volute (17) outside, and an impeller diffuser (18) arranged on a side of the fixing seat (5) facing the volute (17), wherein the impeller diffuser (18) cooperates with the volute (17) to form pneumatic flow channels.
  11. The compressor according to any one of claims 1 to 10, wherein cooling flow channels are formed in the axial bearing assembly (28), the cooling flow channels comprising a first fluid passage port (20), a second fluid passage port (21) and a circulating hole (22), the first fluid passage port (20) and the second fluid passage port (21) being communicated through the circulating hole (22).
  12. The compressor according to claim 11, wherein the first fluid passage port (20) and the second fluid passage port (21) are provided in the fixing seat (5), and the circulating holes (22) pass through the fixing seat (5) and/or the bearing seat (6); or, wherein there are a plurality of circulating holes (22), the plurality of the circulating holes (22) being communicated with the first fluid passage port (20) through a first communicating channel (23), the plurality of the circulating holes (22) being communicated with the second fluid passage port (21) through a second communicating channel (24), the first communicating channel (23) and the second communicating channel (24) being isolated from each other; or, wherein the first fluid passage port (20) and the second fluid passage port (21) both extend axially of the fixing seat (5), and the circulating holes (22) extend radially of the fixing seat (5), and the first communicating channel (23) and the second communicating channel (24) are both provided on an outer peripheral side of the fixing seat (5); or, wherein the first communicating channel (23) is located on an outer peripheral side of the circulating holes (22) and extends circumferentially of the fixing seat (5); the second communicating channel (24) is located on the outer peripheral side of the circulating hole (22) and extends circumferentially of the fixing seat (5); and the first communicating channel (23) is located at a first radial end and the second communicating channel (24) is located at a second radial end of the fixing seat (5); or, wherein the first communicating channel (23) is configured as an open slot formed on an outer peripheral face of the fixing seat (5), and/or the second communicating channel (24) is configured as an open slot formed on the outer peripheral face of the fixing seat (5); or, wherein the circulating hole (22) is configured to be V-shaped, arc-shaped or linear.
  13. The compressor according to any one of claims 1 to 12, further comprising: two radial air bearings (25), each the radial air bearing (25) being arranged at one end axially of the rotor (3), the rotor (3) being rotatably sleeved in the radial air bearings (25).
  14. The compressor according to claim 13, wherein the radial air bearing (25) located at the first axial end of the rotor (3) is arranged on a side of the thrust disc (4) away from the axial bearing assembly (28), and an axial displacement sensor (26) is arranged on an end side of the radial air bearing (25) facing the thrust disc (4).

Description

FIELD OF THE INVENTION The present disclosure relates to the field of air compression technology, in particular to a compressor. DESCRIPTION OF RELATED ART In the process of variable frequency adjustment of a centrifugal compressor, an outlet pressure gradually increases with the increase of power. After gas is compressed by the centrifugal compressor, a high pressure is formed in a pneumatic cavity, and a pressure difference is formed between the high pressure at the back of an impeller and the atmospheric pressure at an intake port, such that an axial force forward along the impeller is produced in an entire shaft system. To this end, a relevant air suspension centrifugal compressor uses dual radial air suspension bearings and dual axial air suspension bearings to operate with support of five degrees of freedom, wherein front and rear radial bearings are distributed on two sides of a motor stator, and front and second axial bearings are distributed on two sides of a thrust disc. The requirement on an effective working clearance between an axial air suspension bearing during operation and a thrust surface is very strict. The effective working clearance is basically in the order of µm. This directly influences the load-bearing performance and bearing life of the axial air suspension bearing. A compressor integration solution adopted has strict requirements on the thickness of the thrust disc, and the sizes of positioning step surfaces of the front and second axial bearing assemblies, in order to ensure the effective working clearance of the axial air suspension bearing. However, assembling too many parts results in a tolerance accumulation, such that the effective working clearance of the axial air suspension bearing cannot be guaranteed. PCT application with publication number WO2020/134433 discloses a centrifugal compressor and an air conditioning apparatus. The centrifugal compressor comprises: a main shaft (1); a diffuser (3) provided with a first thrust bearing (10) at one end thereof away from a diffusion surface; a supporting assembly (5) provided with a second thrust bearing (10') at one end thereof facing the diffuser (3); and a thrust plate (4) configured to rotate together with the main shaft (1) and axially positioned between the diffuser (3) and the supporting assembly (5), wherein the thrust plate (4) has a thrust portion (41), and gaps between two sides of the thrust portion (41) and the first thrust bearing (10) and the second thrust bearing (10') are defined by abutment of the diffuser (3) and the supporting assembly (5). SUMMARY OF THE INVENTION The present disclosure provides a compressor including a drive motor and a wind wheel, wherein the drive motor includes a casing and a rotor, the rotor being rotatably arranged within the casing; the wind wheel is mounted at a first axial end of the rotor; a thrust disc is also provided at the first axial end of the rotor; an axial bearing assembly is arranged between the thrust disc and the wind wheel, and the axial bearing assembly is arranged fixedly with respect to the casing; and an air gap is formed between a first end of the axial bearing assembly and the wind wheel , and an air gap is formed between a second end of the axial bearing assembly and the thrust disc. According to the invention, the axial bearing assembly includes an annular fixing seat fixed to the casing, and an annular bearing seat is arranged on an inner peripheral wall of the fixing seat; a first axial bearing is arranged at a first axial end of the bearing seat, and a second axial bearing is arranged at a second axial end of the bearing seat; and the first air gap is formed between the first axial bearing and the wind wheel, and the second air gap is formed between the second axial bearing and the thrust disc. In some embodiments, the first end of the bearing seat cooperates with the inner peripheral wall of the fixing seat to form a first annular slot, and the first axial bearing is mounted in the first annular slot. In some embodiments, the wind wheel is at least partially mounted into the first annular slot and is in annular seal fit with the inner peripheral wall of the fixing seat. In some embodiments, the second end of the bearing seat cooperates with the inner peripheral wall of the fixing seat to form a second annular slot, and the second axial bearing is mounted in the second annular slot. In some embodiments, the diameter of the thrust disc is smaller than or equal to the diameter of the second annular slot; and/or the thrust disc is at least partially mounted in the second annular slot. In some embodiments, a radial displacement sensor is provided on the inner peripheral wall of the fixing seat, corresponding to the thrust disc. In some embodiments, the wind wheel includes an axial flange projecting towards the thrust disc, and the thrust disc includes a first positioning surface facing the axial bearing assembly; and the axial flange is arranged on an inner peri