Bearing support assembly and processing method thereof, centrifugal compressor

Abstract

The present invention relates to a bearing support assembly and a processing method thereof, and a centrifugal compressor, wherein the bearing support assembly comprises: a bearing support (52) having a through hole (522) thereon for mounting a radial bearing (8); and a fixing plate (51) detachably mounted on one end of the bearing support (52) along the axial direction, and the side of the fixing plate (51) away from the bearing support (52) is used to mount a first thrust bearing (10'). By adopting a split structure for the fixing plate and the bearing support, it is advantageous to ensure the verticality of the through hole for mounting the radial bearing and the end face for mounting the fixing plate during processing, and to ensure the coaxiality of the corresponding through holes of the two bearing supports, thereby ensuring the coaxiality of the two radial bearings. Therefore, this bearing support assembly can improve the assembly accuracy of the bearing by ensuring the processing accuracy, so as to improve the stability of the bearing rotor system; it can also improve the qualified rate of parts processing and reduce the processing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to a bearing support assembly and a processing method thereof, and a centrifugal compressor. Background Art

[0002] Hydrodynamic gas bearings have the advantages of high precision, low friction loss, long life, low vibration, no pollution, no need to provide lubricating medium, etc. They are also suitable for high speed and high precision occasions, and have broad application prospects in centrifugal compressors, especially miniaturized compressors. However, hydrodynamic bearings also have their own disadvantages. For example, due to the low viscosity of the gas and the lack of external gas supply to the hydrodynamic gas bearings, the load capacity is low, and the bearing clearance is in the micron or tens of microns, which requires extremely high processing and assembly precision. These disadvantages of hydrodynamic bearings place high demands on the design of their bearing supports. Summary of the invention

[0003] The purpose of the present invention is to provide a bearing support assembly and a processing method thereof, and a compressor, which can improve the assembly accuracy of the bearing.

[0004] According to a first aspect of the present invention, a bearing support assembly is provided, comprising:

[0005] A bearing support, wherein the bearing support is provided with a through hole for mounting a radial bearing; and

[0006] The fixing plate is detachably mounted on one end of the bearing support along the axial direction, and the side of the fixing plate away from the bearing support is used for mounting the first thrust bearing.

[0007] Furthermore, the fixing plate is also used to limit the displacement of the radial bearing in the axial direction.

[0008] Furthermore, a positioning ring is provided at one end of the fixing plate facing the bearing support, a first annular groove is provided on the bearing support, the positioning ring is embedded in the first groove, and the inner wall of the positioning ring cooperates with the outer wall of the radial bearing portion.

[0009] Furthermore, the bearing support assembly also includes a shell, the first end of the bearing support is connected to the fixed plate, and the second end is connected to the shell, and the cross-sectional outer dimensions of the bearing support gradually increase from the first end to the second end.

[0010] Furthermore, the bearing support assembly also includes a shell, and one end where the bearing support is connected to the shell is provided with a stopper for performing a first repositioning of the connection between the bearing support and the shell.

[0011] Furthermore, the bearing support assembly also includes a pin, which is used to perform a second repositioning of the connection between the bearing support and the housing.

[0012] Furthermore, a vent hole is provided on the bearing support to make the working environment of the radial bearing consistent with that of the first thrust bearing.

[0013] According to a second aspect of the present invention, a centrifugal compressor is provided, comprising the bearing support assembly of the above embodiment.

[0014] Further, the centrifugal compressor further comprises: a main shaft, a diffuser, a thrust plate and a second thrust bearing, the thrust plate being configured to be rotatable together with the main shaft and being axially located between the diffuser and the fixed plate;

[0015] The first thrust bearing is arranged at one end of the fixing plate away from the bearing support, and the second thrust bearing is arranged at one end of the diffuser away from the diffuser surface.

[0016] Furthermore, the centrifugal compressor further comprises: gaps are provided between both sides of the thrust plate and the first thrust bearing and the second thrust bearing, and the gaps on both sides are defined by the diffuser and the fixing plate abutting against each other.

[0017] Furthermore, a second groove is provided at one end of the diffuser away from the diffuser surface, a second thrust bearing is provided at the bottom of the first groove along the axial direction, the fixing plate is fixed to the diffuser, and the thrust plate is located in the second groove.

[0018] Further, the first thrust bearing, the second thrust bearing and / or the radial bearing are air suspension bearings.

[0019] According to a third aspect of the present invention, a processing method of the bearing support assembly based on the above embodiment is proposed, comprising:

[0020] Assemble the bearing support and the housing into a combined body;

[0021] Positioning and clamping the assembly on the processing equipment;

[0022] The through hole of the bearing support and the end surface for installing the fixing plate are processed to the preset size through one-time positioning and clamping.

[0023] Furthermore, two bearing supports are arranged in the housing at intervals along the axial direction. After the two bearing supports and the housing are assembled into a combination, the following is further included:

[0024] The through holes of the two bearing supports are processed to the preset size through one-time positioning and clamping.

[0025] Furthermore, the step of machining the through holes of the two bearing supports to a preset size by one-time positioning and clamping specifically includes:

[0026] The through holes of the two bearing supports are processed sequentially to a preset size from one side of the housing.

[0027] Furthermore, a stopper is provided at one end of the bearing support connected to the housing, and the steps of assembling the bearing support and the housing into a combined body specifically include:

[0028] The bearing support and the housing are first repositioned by fitting them together through the stopper;

[0029] Fix the bearing support and the housing with fasteners;

[0030] After the flange is fixed to the housing, drive pins for the second positioning.

[0031] Furthermore, after the processing is completed, it also includes:

[0032] The assembly formed by assembling the bearing support and the housing is disassembled so that the radial bearing can be installed in a state where the bearing support and the housing are separated.

[0033] Based on the above technical solution, the bearing support assembly of the embodiment of the present invention adopts a split structure for the fixed plate and the bearing support, which is conducive to ensuring the verticality of the through hole for installing the radial bearing and the end face for installing the fixed plate during processing; and when two radial bearings are provided, it is also conducive to ensuring the coaxiality of the corresponding through holes of the two bearing supports, thereby ensuring the coaxiality of the two radial bearings. Therefore, this bearing support assembly can improve the assembly accuracy of the bearing by ensuring the processing accuracy, so as to improve the stability of the bearing rotor system; and it can also improve the qualified rate of parts processing and reduce processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 It is a partial structural schematic diagram of an embodiment of a centrifugal compressor of the present invention;

[0036] Figure 2 It is a schematic diagram of the combined structure of the fixing plate and the bearing support in the bearing support assembly of the present invention;

[0037] Figure 3 It is a structural schematic diagram of an embodiment of a bearing support in a bearing support assembly of the present invention;

[0038] Figure 4 It is a structural schematic diagram of an embodiment of a bearing support assembly of the present invention;

[0039] Figure 5 A schematic structural diagram of the assembly process of a bearing support assembly according to an embodiment of the present invention.

[0040] Description of Reference Numerals

[0041] 1. Main shaft; 2. Impeller; 3. Diffuser; 4. Thrust plate; 6. Housing; 8. Radial bearing; 10', first thrust bearing; 10, second thrust bearing;

[0042] 31. second groove; 41. thrust portion; 42. connecting portion; 51. fixing plate; 511. positioning ring; 512. inner wall; 52. bearing support; 521. first groove; 522. through hole; 523. operating hole; 524. weight reduction groove; 525. flange; 526. vent hole; 527. stopper; 528. pin hole. DETAILED DESCRIPTION

[0043] The present invention is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Each aspect so defined can be combined with any other aspect or aspects, unless explicitly stated not to be combined. In particular, any feature that is considered to be preferred or advantageous can be combined with one or more other features that are considered to be preferred or advantageous.

[0044] The terms "first", "second" and the like appearing in the present invention are only for the convenience of description to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

[0045] Combination Figures 1 to 5 The present invention provides a bearing support assembly, which in an exemplary embodiment includes a fixing plate 51 and a bearing support 52. The bearing support 52 is provided with a through hole 522 for mounting a radial bearing 8; the fixing plate 51 is detachably mounted on one end of the bearing support 52 along the axial direction, and the side of the fixing plate 51 away from the bearing support 52 is used to mount a thrust bearing. The fixing plate 51 can be mounted on the bearing support 52 by fasteners.

[0046] like Figure 3 As shown, since the through hole 522 of the bearing support 52 is used to install the radial bearing 8, and the end face A is used to install the fixing plate 51, the installation verticality of the fixing plate 51 relative to the axis will be affected, thereby affecting the verticality of the thrust bearing and the radial bearing. The fixing plate 51 and the bearing support 52 in this embodiment adopt a split structure, which is conducive to ensuring the verticality relationship between the through hole 522 and the end face A during processing; and when two radial bearings 8 are provided, it is also conducive to ensuring the coaxiality of the two bearing supports 52 corresponding to the through holes 522, thereby ensuring the coaxiality of the two radial bearings 8. Therefore, the assembly accuracy of the bearing can be improved by ensuring the processing accuracy, so as to improve the stability of the bearing rotor system; and it can also improve the qualified rate of parts processing and reduce the processing cost.

[0047] like Figure 1As shown, the fixing plate 51 is also used to limit the displacement of the radial bearing 8 in the axial direction away from the bearing support 52. Therefore, the fixing plate 51 can not only install the first thrust bearing 10', but also axially limit the radial bearing 8, which can make the structure of the bearing support assembly more compact, and is conducive to ensuring the parallelism of the mounting surface of the first thrust bearing 10' and the axial limiting surface of the radial bearing 8 through the processing parallelism of both sides of the fixing plate 51, thereby improving the installation accuracy of the first thrust bearing 10' and the radial bearing 8.

[0048] like Figure 2 As shown, a positioning ring 511 is provided at one end of the fixing plate 51 facing the bearing support 52, and a first annular groove 521 is provided on the bearing support 52. The positioning ring 511 is embedded in the first groove 521 to radially position the fixing plate 51, and there is a gap between the fixing plate 51 and the main shaft 1. Moreover, the inner wall 512 of the positioning ring 511 cooperates with the outer wall of a partial length section of the radial bearing 8, which is used to support a partial length section of the radial bearing 8 and at the same time play an axial thrust role for the radial bearing 8. In order to achieve axial thrust, the hole on the fixing plate 51 that cooperates with the radial bearing 8 is set along a partial thickness of the fixing plate 51, and a thrust platform is left at the end away from the bearing support 52.

[0049] Combination Figure 2 and Figure 5 The bearing support assembly of the present invention also includes a housing 6, a first end of a bearing support 52 is connected to a fixing plate 51, and a second end is connected to the housing 6. Since the outer diameter of the thrust bearing is smaller than the inner diameter of the housing 6, the outer profile of the cross section of the bearing support 52 gradually increases from the first end to the second end.

[0050] To lose weight, Figure 2 As shown, a weight-reducing groove 524 may also be provided on the side of the bearing support 52 away from the thrust bearing. For example, the weight-reducing groove 524 may be provided in an annular shape, with an inner wall parallel to the axis and an outer wall consistent with the outer contour of the bearing support 52 .

[0051] This V-shaped bearing support 52 can improve the overall structural strength of the bearing support 52 by adopting a structure with a gradually changing cross-sectional area, and the force distribution at various locations is uniform, which can optimize the load-bearing capacity. In addition, the outer wall is an inclined surface, which is easy to realize through casting, and has a draft angle when cast through a mold.

[0052] Furthermore, if Figure 2As shown, the bearing support 52 is provided with a vent hole 526, which is used to make the working environment of the radial bearing 8 consistent with the first thrust bearing 10', for example, to make the working back pressure and temperature of the radial bearing 8 consistent with the first thrust bearing 10'. Refrigerant for cooling the motor enters and exits the motor cavity. When the compressor operates normally, the overall motor cavity pressure and temperature are stable, and the thrust bearing and the radial bearing work in the same environment as the motor cavity, that is, to ensure gas circulation, and the back pressure is relatively stable. If the back pressure fluctuates too much, it will cause the bearing gas film to fluctuate, affecting the bearing performance.

[0053] like Figure 3 As shown, an operating hole 523 is provided in the radial direction on the bearing support 52, so that a vibration sensor or a temperature sensor can be installed on the outer wall of the radial bearing 8 through the operating hole 523 to monitor the working state of the radial bearing 8. The hole section of the operating hole 523 along the radial outer side can be used as a bypass hole to ensure that the thrust bearing and the radial bearing 8 and the motor cavity have the same pressure and temperature, and the hole section of the operating hole 523 along the radial inner side plays a role in dissipating heat for the radial bearing 8.

[0054] In some embodiments, in combination Figure 3 and Figure 5 As shown, a flange 525 is provided at the second end of the bearing support 52, and a stop 527 is provided at the outer end of the flange 525. The bearing support 52 is installed in the housing 6 through the flange 525 and fixed by fasteners. At the same time, the bearing support 52 is radially positioned by the stop 527 and axially positioned by the end of the flange 525.

[0055] The stopper 527 is used to first reposition the connection between the bearing support 52 and the housing 6, and can preliminarily position the installation position relationship between the bearing support 52 and the housing 6. Further, the bearing support assembly also includes a pin, and a pin hole 528 is provided on the flange 525 of the bearing support 52. The pin can penetrate the pin hole 528 and the pin hole on the housing 6 to perform a second repositioning of the connection between the bearing support 52 and the housing 6, so as to accurately position the installation position relationship between the bearing support 52 and the housing 6. The pin can be arranged axially or radially.

[0056] This embodiment can accurately ensure the installation accuracy of the bearing support 52 in the housing 6 by adopting double positioning, thereby improving the position accuracy between the radial bearing 8 and the thrust bearing.

[0057] like Figure 3 and Figure 5 As shown, the bearing support 52 is disposed in the housing 6, and the through hole 522 of the bearing support 52 and the end surface A for mounting the fixing plate 51 are configured to be processed to a preset size when the bearing support 52 and the housing 6 are assembled into a combination.

[0058] This embodiment is processed in a state where the bearing support 52 and the housing 6 are positioned and formed into an assembly. The processing accuracy of the assembly can ensure the installation accuracy of the bearing, and the verticality of the through hole 522 and the end face A can be ensured by one-time positioning and clamping.

[0059] Furthermore, if Figure 5 As shown, two bearing supports 52 are axially spaced apart in the housing 6 for supporting two different positions of the main shaft 1, and the through holes 522 of the two bearing supports 52 are configured to be processed to a preset size when the two bearing supports 52 and the housing 6 are assembled into a combination.

[0060] This embodiment processes the two bearing supports 52 and the housing 6 in a state of positioning and forming an assembly, so that the two through holes 522 can be processed in sequence from one side of the assembly, and the size and coaxiality of the two through holes 522 can be ensured by one-time positioning and clamping.

[0061] Since the key parts of the bearing support 52 are processed in one positioning and clamping process, the coaxiality of the two through holes 522 and the perpendicularity between the corresponding through hole 522 of each bearing support 52 and the end face A can be improved, thereby ensuring the coaxiality of the two radial bearings 8 and the perpendicularity of the thrust bearing, thereby improving the working stability of the rotor system. Through actual measurement, the coaxiality of the two radial bearings 8 and the perpendicularity of the radial bearing 8 and the thrust bearing can be improved to within 5 microns.

[0062] The specific processing method of the bearing support assembly is described below. During processing, the two bearing supports 52 are first repositioned to match the housing 6 through the stop 527, and then the flange 525 is fixed to the housing 6 by fasteners, and then fixed with pins. Subsequently, the housing 6 and the two bearing supports 52 are positioned on the processing equipment as an integral component, and the end faces A of the two bearing supports 52 and the fixing plate 51 are processed to ensure the verticality of the thrust bearing and the radial bearing 8, and then the through holes 522 of the two bearing supports 52 are processed in sequence from one side to ensure the coaxiality of the two radial bearings 8.

[0063] After the processing is completed, the bearing support 52 is removed, and the radial bearing 8 is installed into the through hole 522 of the bearing support 52 by shrink-fitting, and then the fixing plate 51 is installed on the first end of the bearing support 52. Then, the bearing support 52 with the fixing plate 51 can be fixed on the housing 6 together, and the bearing support 52 can be positioned by the stop 527 and the pin position determined during processing.

[0064] If each bearing adopts a dynamic pressure gas bearing, since the bearing itself has high processing accuracy and requires extremely high assembly position accuracy, if the assembly accuracy is reduced, the bearing performance will be reduced, and in severe cases, the rotor will not be able to float; when two or more dynamic pressure radial bearings are used, the coaxiality of the bearing is required to be at the micron level, and the verticality of all thrust surfaces relative to the center of the rotor is also required to be at the micron level. The method of the present invention can process the through holes 522 and the end faces A of the two bearing supports 52 in one positioning and clamping process, which can improve the processing accuracy and subsequent assembly accuracy.

[0065] Secondly, the present invention provides a processing method of the bearing support assembly based on the above embodiment, which, in some embodiments, includes:

[0066] Step 101, assemble the bearing support 52 and the housing 6 into a combined body;

[0067] Step 102, positioning and clamping the assembly on a processing device, which may be a machine tool, etc.;

[0068] Step 103 , the through hole 522 of the bearing support 52 and the end surface A for mounting the fixing plate 51 are processed to a preset size through one-time positioning and clamping.

[0069] This embodiment is processed in a state where the bearing support 52 and the housing 6 are positioned and formed into an assembly, so that the installation accuracy of the bearing can be ensured by the processing accuracy of the assembly. Moreover, through one-time positioning and clamping, a unified processing reference can be used to ensure the processing verticality of the through hole 522 and the end face A, thereby ensuring the verticality of the radial bearing 8 and the thrust bearing.

[0070] In some embodiments, two bearing supports 52 are provided in the housing 6 and are spaced apart from each other in the axial direction. After the two bearing supports 52 and the housing 6 are assembled into a combination body in step 101, the processing method further includes:

[0071] Step 104 , machining the through holes 522 of the two bearing supports 52 to a preset size through one-time positioning and clamping.

[0072] There is no restriction on the execution order of step 104 and step 103. In actual processing, according to the convenience of processing, the two through holes 522 and the end face A are finely processed in one positioning and clamping process.

[0073] This embodiment processes the two bearing supports 52 while positioning them with the housing 6 and forming a combined body, so that the installation accuracy of the bearings can be ensured by the processing accuracy of the combined body. Moreover, a unified processing reference can be adopted by positioning and clamping once, and the size and coaxiality of the two through holes 522 can be ensured by positioning and clamping once.

[0074] In some embodiments, step 104 of processing the through holes 522 of the two bearing supports 52 to a preset size by one-time positioning and clamping specifically includes: processing the through holes 522 of the two bearing supports 52 to the preset size in sequence from one side of the housing 6 .

[0075] The through holes 522 can be processed by boring. The processing tool can process the two through holes 522 in sequence from one side of the housing 6 by axial feeding to improve the processing efficiency and further improve the coaxiality of the two through holes 522.

[0076] In some embodiments, a stopper 527 is provided at one end of the bearing support 52 connected to the housing 6. Step 101 of assembling the bearing support 52 and the housing 6 into a combined body specifically includes:

[0077] Step 101A, the bearing support 52 and the housing 6 are matched through the stopper 527 to perform the first repositioning;

[0078] Step 101B, fixing the bearing support 52 and the housing 6 by fasteners;

[0079] Step 101C: After the flange is fixed to the housing 6, pins are driven in for a second re-positioning.

[0080] In this embodiment, steps 101 to 103 are performed sequentially.

[0081] After the initial positioning through the stop 527, the positional relationship between the bearing support 52 and the housing 6 is constrained by fasteners. On this basis, on the basis of the original pin hole 528, pin holes are made on the bearing support 52 and the housing 6, and pins are inserted into the pin holes. The pins can prevent the bearing support 52 and the housing 6 from changing their positions due to large cutting forces during the processing, and can also provide accurate positioning for the subsequent product assembly process. By adopting double positioning, the installation accuracy of the bearing support 52 in the housing 6 can be accurately guaranteed, thereby improving the position accuracy between the radial bearing 8 and the thrust bearing.

[0082] Furthermore, after the processing is completed, the processing method further comprises:

[0083] Step 105 , disassemble the assembly formed by assembling the bearing support 52 and the housing 6 , so as to install the radial bearing 8 in a state where the bearing support 52 and the housing 6 are separated.

[0084] After the processing is completed, the bearing support 52 is removed, and the radial bearing 8 is installed into the through hole 522 of the bearing support 52 by heat-fitting, and then the fixing plate 51 is installed at the first end of the bearing support 52. The bearing support 52 can be fixedly installed on the housing 6 by the pin position determined during processing. The bearing support 52 ensures the assembly accuracy of the bearing through the double positioning method of the stop 527 and the pin, thereby improving the stability of the bearing rotor system.

[0085] Finally, the present invention also provides a centrifugal compressor, comprising the bearing support assembly of the above embodiment. In addition, the bearing support assembly of the present invention can also be used in screw refrigeration compressors and the like.

[0086] The working principle of the centrifugal compressor is as follows: during the operation of the compressor, the main shaft 1 rotates at a high speed, the gas is accelerated by the impeller 2 on the left and enters the diffuser 3, the gas is compressed and pressurized by the diffuser 3 and then enters the first volute, the exhaust channel on the first volute guides the compressed gas to enter the right impeller 2, and enters the right diffuser 3 after the centrifugal action of the right impeller 2, the gas enters the second volute after the second stage of compression, and is discharged from the compressor through the exhaust channel on the second volute.

[0087] like Figure 1 As shown, the centrifugal compressor of the present invention further includes: a main shaft 1, a diffuser 3, a thrust plate 4 and a second thrust bearing 10. The thrust plate 4 is configured to be rotatable together with the main shaft 1 and is axially located between the diffuser 3 and the fixed plate 51. The first thrust bearing 10' is arranged at one end of the fixed plate 51 away from the bearing support 52, and the second thrust bearing 10 is arranged at one end of the diffuser 3 away from the diffuser surface. Specifically, the thrust plate 4 has a thrust portion 41, and the left and right surfaces of the thrust portion 41 form working surfaces with the thrust bearings on both sides, which can withstand bidirectional axial forces and ensure the stable and reliable operation of the compressor during full working condition operation and reverse operation.

[0088] In the centrifugal compressor of this embodiment, the thrust plate can cooperate with the thrust bearings on both sides to withstand axial forces in the left and right directions to ensure the stability of the centrifugal compressor during full-operation and reverse operation. The operating condition of the compressor refers to the evaporation temperature and condensation temperature of the system where the compressor is located. The full operating condition means that the compressor works within a certain evaporation temperature range and condensation temperature range. When the compressor stops, since the exhaust pressure is higher than the suction pressure, a reverse situation will occur after the stop.

[0089] Furthermore, there are gaps between both sides of the thrust plate 4 and the first thrust bearing 10 ′ and the second thrust bearing 10 , and the gaps on both sides are defined by the diffuser 3 and the fixing plate 51 abutting against each other.

[0090] For example, the first thrust bearing 10 ′, the second thrust bearing 10 and / or the radial bearing 8 may be static pressure or dynamic pressure gas thrust bearings, or may also be magnetic bearings.

[0091] by Figure 1 For example, due to the gap between the thrust bearing and the thrust plate 4, the gas will form a pressurized gas film in the gap to play a thrust and lubrication role. Since the thrust bearing itself is in the compressor cavity, the gas comes from the cavity environment. During the rotation of the rotor, the gas can be brought into the gap to form a dynamic pressure gas thrust bearing.

[0092] By abutting against each other with the fixing plate 51 and the diffuser 3 for combined limiting, the position of the thrust plate 4 and the gap between the thrust bearings on both sides are defined, thereby accurately ensuring the thrust bearing gap, reducing the difficulty of assembly, improving the assembly efficiency and assembly accuracy, and ensuring the working performance of the thrust bearing, thereby improving the operating stability of the compressor.

[0093] Further, the thrust plate 4 may also include a connecting portion 42, the thrust plate 4 is connected to the thrust portion 41, and is sleeved on the main shaft 1. The bottom of the second groove 31 is provided with a through hole, and the connecting portion 42 is embedded in the through hole. The connecting portion 42 may be interference fit with the main shaft 1, so that the thrust plate 4 can rotate with the main shaft 1. The diffuser 3 and the fixing plate 51 are fixedly arranged, and there is a gap between them and the main shaft 1. For example, the thrust plate 4 may be a cylindrical stepped structure.

[0094] Further, still refer to Figure 1 A second groove 31 is provided at one end of the diffuser 3 away from the diffuser surface. The first thrust bearing 10 ′ is provided at the bottom of the second groove 521 along the axial direction. The fixing plate 51 is fixed to the diffuser 3 . The thrust portion 41 of the thrust plate 4 is located in the second groove 31 .

[0095] Since the bearing support 52 needs to be fixed on the housing 6 of the compressor, its own position is fixed, thereby the fixing plate 51 can be axially positioned. Moreover, the diffuser 3 is also fixed on the housing 6, and the diffuser 3 and the fixing plate 51 are abutted against each other, so that the clearance of the thrust bearings on both sides can be accurately guaranteed by the axial depth of the second groove 31, which can improve the assembly accuracy, reduce the assembly difficulty, improve the assembly efficiency, and at the same time ensure the performance of the thrust bearing, prevent the thrust bearing performance from being reduced or even failed due to inaccurate clearance control, thereby improving the operating stability of the compressor.

[0096] like Figure 1 As shown, the depth of the second groove 31 includes: the thickness of the thrust portion 41, the thickness of the thrust bearings on both sides and the gap between the thrust bearings on both sides. Therefore, in order to ensure the gap between the thrust bearings on both sides, the gap can be controlled by increasing the depth of the second groove 31, the thickness of the thrust portion 41 and the thickness of the thrust bearings on both sides. The specific method is: according to the gap range required by the thrust bearing, the thickness tolerance range of the thrust portion 41 and the thickness tolerance range of the thrust bearing, the design depth and tolerance range of the second groove 31 are reversed. Therefore, the thrust bearing gap can be ensured by improving the machining accuracy of the depth of the second groove 31, which can improve the assembly accuracy, reduce the assembly difficulty, and thus improve the assembly efficiency.

[0097] In some embodiments, the first thrust bearing 10' is directly fixed to the bottom of the second groove 31. This structure integrates the diffuser 3 and the thrust bearing fixing plate into one part, and the bottom of the second groove 31 can be used as the fixing plate of the second thrust bearing 10, without the need to set up an additional thrust bearing fixing plate, which can further reduce the axial size of the bearing support assembly and make the structure more compact.

[0098] In a specific structure, reference Figure 1 The first thrust bearing 10' is fixed to the fixing plate 51 by fasteners, the second thrust bearing 10 is fixed to the diffuser 3 by fasteners, the fixing plate 51 and the diffuser 3 are fixed by fasteners, and the outer periphery of the diffuser 3 is provided with a positioning stop to facilitate positioning and installation with the housing 6.

[0099] The above is a detailed introduction to a bearing support assembly and a processing method thereof, and a centrifugal compressor provided by the present invention. Specific embodiments are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A bearing support assembly, characterized in that: include: A bearing support (52), wherein the bearing support (52) is provided with a through hole (522) for mounting a radial bearing (8); and A fixing plate (51) is directly and detachably mounted on an end face of the bearing support (52) along the axial direction, and a side face of the fixing plate (51) away from the bearing support (52) is used to mount a first thrust bearing (10') and limit the axial displacement of the radial bearing (8); a positioning ring (511) is provided at one end of the fixing plate (51) facing the bearing support (52), a first annular groove (521) is provided on the bearing support (52), the positioning ring (511) is embedded in the first groove (521), and the inner wall of the positioning ring (511) cooperates with the outer wall of a partial length section of the radial bearing (8).

2. The bearing support assembly according to claim 1, characterized in that: It also includes a housing (6), a first end of the bearing support (52) being connected to the fixing plate (51), and a second end being connected to the housing (6), and a cross-sectional outer dimension of the bearing support (52) gradually increasing from the first end to the second end.

3. The bearing support assembly according to claim 1, characterized in that: It also includes a housing (6), and one end of the bearing support (52) connected to the housing (6) is provided with a stopper (527) for performing a first repositioning of the connection between the bearing support (52) and the housing (6).

4. The bearing support assembly according to claim 3, characterized in that: It also includes a pin, which is used to perform a second repositioning of the connection between the bearing support (52) and the housing (6).

5. The bearing support assembly according to claim 1, characterized in that: The bearing support (52) is provided with a vent hole (526) for making the working environment of the radial bearing (8) consistent with that of the first thrust bearing (10').

6. A centrifugal compressor, characterized in that: It comprises the bearing support assembly described in any one of claims 1 to 5.

7. The centrifugal compressor according to claim 6, characterized in that: Also includes: A main shaft (1), a diffuser (3), a thrust plate (4), and a second thrust bearing (10), wherein the thrust plate (4) is configured to be rotatable together with the main shaft (1) and is located between the diffuser (3) and the fixed plate (51) along the axial direction; The first thrust bearing (10') is arranged at one end of the fixing plate (51) away from the bearing support (52), and the second thrust bearing (10) is arranged at one end of the diffuser (3) away from the diffuser surface.

8. The centrifugal compressor according to claim 7, characterized in that: Also includes: There are gaps between both sides of the thrust plate (4) and the first thrust bearing (10') and the second thrust bearing (10), and the gaps on both sides are defined by the diffuser (3) and the fixing plate (51) abutting against each other.

9. The centrifugal compressor according to claim 8, characterized in that: A second groove (31) is provided at one end of the diffuser (3) away from the diffuser surface, the second thrust bearing (10) is provided at the bottom of the second groove (31) along the axial direction, and the thrust plate (4) is located in the second groove (31).

10. The centrifugal compressor according to claim 7, characterized in that: The first thrust bearing (10'), the second thrust bearing (10) and / or the radial bearing (8) are air suspension bearings.

11. A method for processing a bearing support assembly according to any one of claims 1 to 5, characterized in that: include: Assembling the bearing support (52) and the housing (6) into a combined body; Positioning and clamping the assembly on processing equipment; The through hole (522) of the bearing support (52) and the end surface for mounting the fixing plate (51) are processed to a preset size through one-time positioning and clamping.

12. The processing method according to claim 11, characterized in that: Two bearing supports (52) are arranged in the housing (6) at intervals in the axial direction. After the two bearing supports (52) and the housing (6) are assembled into a combined body, the assembly further comprises: The through holes (522) of the two bearing supports (52) are processed to a preset size through one-time positioning and clamping.

13. The processing method according to claim 12, characterized in that: The step of machining the through holes (522) of the two bearing supports (52) to a preset size by one-time positioning and clamping specifically comprises: The through holes (522) of the two bearing supports (52) are processed sequentially from one side of the housing (6) to a preset size.

14. The processing method according to claim 11, characterized in that: One end of the bearing support (52) connected to the housing (6) is provided with a stopper (527), and the steps of assembling the bearing support (52) and the housing (6) into a combined body specifically include: The bearing support (52) and the housing (6) are matched together through the stopper (527) to perform a first repositioning; Fixing the bearing support (52) and the housing (6) via fasteners; After the flange (525) of the bearing support (52) is fixed to the housing (6), pins are driven in for a second re-positioning.

15. The processing method according to claim 11, characterized in that: After the processing is completed, it also includes: The assembly formed by assembling the bearing support (52) and the housing (6) is disassembled so that the radial bearing (8) can be installed in a state where the bearing support (52) and the housing (6) are separated.

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