Porous static pressure gas radial bearing with elastic ring type extrusion oil film damper module

Abstract

The invention discloses a porous static pressure gas radial bearing with an elastic ring type extrusion oil film damper module, and belongs to the technical field of mechanical bearings. Comprising a bearing shell, a bearing inner ring arranged in the bearing shell in the axial direction, a porous sleeve and a damper module arranged between the bearing shell and the bearing inner ring, and the damper module is formed by connecting a damper shell, an elastic ring, a damper inner ring, an annular fastening plate, a sealing gasket and a sealing ring; the annular fastening plate and the damper shell are connected through a bolt set. The two elastic ring type extrusion oil film damper modules are designed to be of a whole-circle structure, and the two elastic ring type extrusion oil film damper modules are symmetrically arranged in the bearing shell in the axial direction, so that vibration movement of a bearing inner ring in any radial direction can be borne, a rotor in the bearing is allowed to generate axis inclination and misalignment to a certain degree, good damping capacity is provided for the bearing, and the service life of the bearing is prolonged. The stability and reliability of the bearing can be improved, and meanwhile the number of dampers of the bearing is reduced.

Description

Technical Field

[0001] The invention relates to a porous static pressure gas radial bearing, in particular to a porous static pressure gas radial bearing with an elastic ring type squeeze film damper module, and belongs to the technical field of mechanical bearings. Background Art

[0002] With the development of turbomachinery, precision machining, aerospace and other technologies, rotating machinery is constantly developing towards high speed, high efficiency, high power density and high rotation accuracy. Traditional oil-lubricated bearings have high friction temperature rise and power loss, which greatly limits the improvement of rotating machinery speed, energy density and efficiency.

[0003] Hydrostatic gas bearings use gas as lubrication medium. Compared with oil-lubricated bearings, they have good performance such as high efficiency, high precision, high speed and small vibration, which makes gas-lubricated bearings have broad application prospects in the field of high-speed rotating machinery. Porous gas bearings use porous throttling. Due to the large number of evenly distributed micropores inside and on the surface of the porous material, compared with hydrostatic gas bearings using other throttling methods, the lubricating gas film formed on the surface of the porous gas bearing is more uniform, the bearing has a greater load-bearing capacity, and the stability is also improved. At the same time, the bearing also has higher rotation accuracy and a wider speed range. However, gas bearings have problems such as high steady-state synchronous vibration level and subsynchronous rotor instability, which hinder the practical application of porous gas bearings.

[0004] At present, by improving the balance and modifying the rotor-bearing system, the critical speed of the system can be moved out of the working range, thereby avoiding the peak amplitude within the working speed range. Another more effective method is to suppress the higher peak amplitude at the critical speed by introducing external damping. While introducing damping, the unstable starting speed can be increased to avoid the instability of the subsynchronous rotor and improve the dynamic stability of the rotor-bearing system. Therefore, a squeeze film damper is introduced on the porous gas bearing to provide viscous damping for the bearing and dissipate vibration energy. For example, the patent document with application publication number: CN114294327A and invention name is a closed squeeze film damper with a symmetrical structure and a porous tilting pad bearing using the damper, in which the squeeze film damper is combined with the porous tilting pad bearing to improve the stability of the bearing, the closed damper is arranged between the tilting pad and the bearing housing, and the damper and the tilting pad are connected by a ball stud. When the pad vibrates, the ball stud drives the plunger to vibrate in the damper cavity to generate a damping force, thereby improving the damping capacity of the bearing.

[0005] However, the porous gas bearing using the above squeeze film damper still has the following problems: 1) The porous gas bearing adopts a tilting pad structure. The tilting pad can adapt to the position change of the rotor to produce adaptive swing, which improves the stability of the bearing to a certain extent. However, the lack of air film pressure in the gap between the tilting pads causes a large loss of the bearing's load-bearing capacity, which has an adverse effect on the bearing's load-bearing capacity; 2) For porous gas bearings with tilting pad structures, each tilting pad requires a separate damper to provide damping, and an additional elastic support structure is also required to provide elastic support for the tilting pad. The more tilting pads there are, the more dampers are required, the more complex the bearing structure is, and the lower the reliability of the bearing is; 3) In addition, the squeeze film damper used in the existing porous gas bearing generates damping capacity by using the damping fluid flowing through the restricted gap. This damper structure has high requirements for processing accuracy and assembly, which increases the manufacturing difficulty and production cost of the bearing, and is not conducive to the mass production and application of the bearing; 4) On the other hand, the squeeze film damper used in the porous gas bearing has the problem of highly nonlinear film stiffness and film damping, which is not conducive to the rotor-bearing system to suppress high dynamic loads under extreme working conditions, and the rotor-bearing system is prone to bistable deterioration response.

[0006] Therefore, there is an urgent need to design a porous gas bearing with an attached squeeze film damper, which can simplify the bearing structure, reduce the number of dampers in the bearing, and improve the high-speed operation stability of the bearing. Summary of the invention

[0007] The purpose of the present invention is to solve the problems existing in the prior art and provide a porous static pressure gas radial bearing with an elastic ring type squeeze film damper module. By designing the elastic ring type squeeze film damper module as a full-circle structure and arranging two of them axially symmetrically in the bearing housing, it can withstand the vibration movement of the inner ring of the bearing in any radial direction, and allow the rotor in the bearing to produce a certain degree of axial tilt and misalignment, thereby providing the bearing with good damping capacity, improving the stability and reliability of the bearing, and reducing the number of dampers in the bearing.

[0008] To achieve the above-mentioned object, the present invention adopts the following technical scheme: a porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module, comprising a bearing housing, a bearing inner ring axially arranged in the bearing housing, a porous sleeve, and a damper module arranged between the bearing housing and the bearing inner ring, wherein the damper module is composed of a damper housing, an elastic ring, a damper inner ring, an annular fastening plate, a sealing gasket and a sealing ring connected together; The bearing housing is symmetrically provided with damper mounting grooves at both axial ends thereof, a cylindrical hole with a small aperture is provided in the middle thereof and the two damper mounting grooves are connected through the cylindrical hole, an air supply channel penetrating the cylindrical hole is provided in the middle of the outer wall thereof, and a mounting groove anti-rotation plane is provided on the inner wall of the damper mounting groove along the axial direction; The outer circumferential surface of the bearing inner ring is set as a profile structure corresponding to the inner cavity of the bearing housing, the two ends of the outer circumferential surface are set as cylindrical matching surfaces, the inner wall of the inner circumferential surface is set with a pressure equalizing groove, and the middle part of the outer circumferential surface is set with an air inlet hole connecting the pressure equalizing groove and the air supply channel; The outer circumferential surface of the damper housing is arranged close to the inner wall of the damper mounting groove, and a damper anti-rotation plane matching with the anti-rotation plane of the mounting groove is arranged on the outer circumferential surface, an annular cavity is arranged in the axial interior, and a housing sealing groove is arranged on the outer end surface, and a sealing gasket is matched and connected in the housing sealing groove; A matching hole is provided in the axial interior of the damper inner ring, the matching hole is matched and connected to the outer circumferential surface of the cylindrical matching surface, the outer circumferential surface of the damper inner ring is provided as an extrusion ring, the end surfaces of both sides of the extrusion ring are provided with inner ring sealing grooves, and the inner ring sealing grooves are matched and connected with sealing rings; The inner and outer annular surfaces of the elastic ring are respectively provided with inner bosses and outer bosses staggered in the axial direction, and the annular surface of the elastic ring located between the inner bosses and the outer bosses is also provided with a plurality of oil holes in the radial direction, wherein the inner bosses contact with the outer annular surface of the extrusion ring to separate the inner oil film layer of the damper into a plurality of inner oil films, and the outer bosses contact with the annular cavity to separate the outer oil film layer of the damper into a plurality of outer oil films, and two adjacent inner oil films are connected with the outer oil film through the oil holes; A fastening plate anti-rotation plane is arranged on the side surface of the annular fastening plate, and the fastening plate anti-rotation plane is arranged corresponding to the damper anti-rotation plane, and the two are circumferentially fixedly connected in the bearing housing by cooperating with the anti-rotation plane of the mounting groove, and the inner ring surface of the annular fastening plate is in close contact with the sealing gasket and the sealing ring, and the outer ring surface of the annular fastening plate is flush with the outer end surface of the bearing housing.

[0009] A mounting hole is radially penetrated on the anti-rotation plane of the mounting groove, and an oil filling hole is radially penetrated on the anti-rotation plane of the damper. The positions of the mounting hole and the oil filling hole are correspondingly arranged, and the two are sealed and connected by a sealing bolt. At the same time, the damper module is axially fixed by the sealing bolt.

[0010] A rotation-stopping boss is arranged on the bottom of the inner wall of the annular cavity, and a rotation-stopping notch is arranged on the elastic ring at the center of the end face of the outer boss. The elastic ring and the damper housing are circumferentially fixed by the matching connection between the rotation-stopping notch and the rotation-stopping boss.

[0011] The inner bosses and outer bosses on the elastic ring are evenly distributed along the circumferential direction, and the interval angle between two adjacent inner bosses and outer bosses is 21° to 23°. The diameter of the oil hole is 0.3 to 0.5 mm.

[0012] The matching hole and the inner ring of the bearing are connected by a transition fit.

[0013] The inner circular surface of the bearing inner ring is symmetrically provided with arc bosses evenly distributed along the circumferential direction at both ends, and the gap between the arc bosses and the inner circular surface of the bearing inner ring constitutes a pressure equalizing groove; the outer wall of the porous sleeve is tightly attached to the inner circular surface of the arc boss of the bearing inner ring, and is glued and connected to the inner circular surface of the arc boss.

[0014] The porous sleeve is configured as a full-circle annular column structure, and the outer diameter of the porous sleeve is the same as the inner diameter of the arc boss.

[0015] The housing sealing groove is provided with a plurality of threaded holes evenly distributed in the circumferential direction, the annular surface of the annular fastening plate is provided with a plurality of connecting holes evenly distributed in the circumferential direction, and the annular fastening plate is fixed to the damper housing by bolts correspondingly connected in the connecting holes and the threaded holes.

[0016] The beneficial effects of the present invention are: 1) The present invention designs the elastic ring type squeeze film damper module as a full-circle structure, which can withstand the vibration movement of the inner ring of the bearing in any radial direction, provide good damping capacity for the bearing, and improve the stability of the bearing. At the same time, the elastic ring can provide elastic support for the bearing; and by axially symmetrically arranging two full-circle structure damper modules in the bearing housing, the rotor in the bearing is allowed to produce a certain degree of axial tilt and misalignment, so that the bearing has good adaptability, while also reducing the number of dampers in the bearing and improving the reliability of the bearing.

[0017] 2) In the present invention, the full-circle porous sleeve is fixed to the inner ring of the bearing by gluing. The porous sleeve, the inner ring of the bearing and the arc boss together constitute the pressure equalizing chamber structure of the gas bearing. The pressurized gas diffuses evenly from the pressure equalizing chamber to the porous layer, forming a continuous and uniform micron-level lubricating gas film on the surface of the porous bearing, which is beneficial to improving the bearing's load-bearing capacity.

[0018] 3) The elastic ring type squeeze film damper module of the present invention generates viscous damping by the damping fluid in the oil film flowing through the oil holes when working. The oil holes, inner bosses, outer bosses and other structures on the elastic ring are easy to process and easy to ensure the processing accuracy, which reduces the difficulty of manufacturing and assembling the damper and reduces the manufacturing cost of the bearing.

[0019] 4) The elastic ring squeeze film damper of the present invention adopts a modular design, which is convenient for processing and manufacturing, and is conducive to ensuring the consistency of performance between damper modules. When the damper module is damaged, a new damper can be directly replaced; by sealing the installation gap of the damper module, the oil-free operating environment of the porous static pressure gas radial bearing can be ensured.

[0020] 5) In the present invention, under the excitation of the journal, the damping liquid in the damper oil chamber flows through the oil hole and produces a throttling effect, effectively buffering the impact of transient external loads on the oil film, so that the bearing has good vibration reduction performance; the elastic ring produces radial bending deformation to automatically adjust the oil chamber volume, so that the oil film stiffness and damping coefficient are linearized within the operating speed of the bearing, so that the porous static pressure gas radial bearing with an elastic ring extrusion oil film damper module of the present invention is beneficial for suppressing high dynamic loads under extreme working conditions, and the rotor-bearing system is suitable for vibration bistable state. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural explosion diagram of the porous static pressure gas radial bearing of the present invention; Figure 2 for Figure 1 Front and side half-section views of the assembled elastic ring squeeze film damper module; Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A; Figure 4 This is an assembly structure diagram of the porous static pressure gas radial bearing of the present invention; Figure 5 The side view and front view of the assembled porous static pressure gas radial bearing of the present invention are shown; Figure 6 for Figure 1 A perspective view and a cross-sectional view of the middle bearing housing; Figure 7 for Figure 1 The three-dimensional and cross-sectional views of the inner ring of the middle bearing; Figure 8 for Figure 1 A perspective view and a left side view of the middle damper housing; Fig. 9 for Figure 1 A stereogram of the middle elastic ring; Fig.10 for Figure 1 The three-dimensional and cross-sectional views of the inner ring of the middle damper; Fig.11 for Figure 1 A perspective view of the middle annular fastening plate.

[0022] In the figure, 1-bearing housing, 101-damper mounting groove, 102-mounting groove anti-rotation plane, 103-mounting hole, 104-air supply channel, 105-cylindrical hole, 2-bearing inner ring, 201-cylindrical matching surface, 202-inlet hole, 203-arc boss, 204-pressure equalizing groove, 3-damper housing, 301-annular cavity, 302-anti-rotation boss, 303-damper anti-rotation plane, 304-oil filling hole, 3 05-housing sealing groove, 4-elastic ring, 401-inner boss, 402-outer boss, 403-oil hole, 404-anti-rotation notch, 5-damper inner ring, 501-extrusion ring, 502-inner ring sealing groove, 503-matching hole, 6-annular fastening plate, 601-anti-rotation plane of fastening plate, 7-sealing gasket, 8-sealing ring, 9-porous sleeve; 10-sealing bolt, 11-inner oil film, 12-outer oil film. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0024] Example: Figures 1 to 3 As shown, the present invention provides a porous static pressure gas radial bearing with an elastic ring squeeze oil film damper module, comprising a bearing housing 1, a bearing inner ring 2 axially arranged in the bearing housing 1, a porous sleeve 9, and a damper module arranged between the bearing housing 1 and the bearing inner ring 2, wherein the damper module is composed of a damper housing 3, an elastic ring 4, a damper inner ring 5, an annular fastening plate 6, a sealing gasket 7 and a sealing ring 8.

[0025] The assembly process and working principle of the damper module are as follows: After the elastic ring 4, the damper inner ring 5, the sealing gasket 7 and the sealing ring 8 are installed in the damper housing 3, the anti-rotation notch 404 of the elastic ring 4 cooperates with the anti-rotation boss 302 in the damper housing 3 to circumferentially fix the elastic ring 4, and the annular fastening plate 6 and the damper housing 3 are connected by a bolt group to axially fix the elastic ring 4 and the damper inner ring 5 and press the sealing gasket 7 and the sealing ring 8 to seal the installation gap of the damper module, thereby forming an elastic ring type squeeze film damper module.

[0026] After the damper module is assembled, the inner boss 401 of the elastic ring 4 abuts against the annular working surface of the extrusion ring 501 to separate the inner oil film layer of the damper into several inner oil films 11, and the outer boss 402 of the elastic ring 4 abuts against the annular cylinder of the annular cavity 301 to separate the outer oil film layer of the damper into several outer oil films 12. The adjacent inner oil films 11 and outer oil films 12 are connected by the oil holes 403 to realize the circulation of the damping fluid.

[0027] like Figure 1 , 4As shown in Figure 5, the assembly process and working principle of the bearing are as follows: The bearing housing 1 is provided with damper installation grooves 101 at both ends. After the damper module is assembled, the bearing inner ring 2 first passes through the cylindrical hole 105 of the bearing housing 1, and then the damper module is respectively installed in the damper installation grooves 101 on both sides of the bearing housing 1. The installation groove anti-rotation plane 102 provided in the damper installation groove 101 cooperates with the damper anti-rotation plane 303 and the fastening plate anti-rotation plane 601 to fix the damper module circumferentially. The damper anti-rotation plane 303 of the damper housing 3 is provided with an oil filling hole 304. After the damper module is installed in the damper installation groove 101, the damping liquid is filled into the damper through the oil filling hole 304, and the oil filling hole 304 is sealed by the sealing bolt 10. At the same time, the head of the sealing bolt 10 cooperates with the installation hole 103 of the bearing housing 1 to fix the damper module axially.

[0028] The matching hole 503 of the damper inner ring 5 and the cylindrical matching surface 201 of the bearing inner ring 2 are connected by a transition fit, which axially fixes the bearing inner ring 2 while transmitting the radial vibration generated by the bearing inner ring 2 to the damper inner ring 5. When the bearing inner ring 2 vibrates radially, it drives the extrusion ring 501 to squeeze the elastic ring 4. The elastic ring 4 produces elastic deformation and squeezes the damping liquid in the inner oil film 11 and the outer oil film 12, so that the damping liquid flows through the oil hole 403 to produce viscous damping. The elastic ring 4 produces elastic deformation to provide elastic support for the bearing inner ring 2.

[0029] The porous sleeve 9 is connected to the arc boss 203 of the bearing inner ring 2 by gluing, and the bearing inner ring 2 and the arc boss 203 together form a pressure equalizing groove 204. The external gas source pipeline is connected to the air inlet 202 through the air supply channel 104, and the pressurized gas is transported to the inside of the pressure equalizing groove 204. After being throttled by the porous sleeve 9, a micron-level lubricating gas film with a certain load-bearing capacity is formed on the rotor surface to support the rotor. The annular end faces on both sides of the porous sleeve 9 are evenly coated with epoxy resin glue for sealing to prevent the pressurized gas from leaking from the end face of the porous sleeve 9 and reducing the bearing capacity of the bearing.

[0030] like Figure 6 As shown, damper mounting grooves 101 are provided at both ends of the bearing housing 1, a mounting groove anti-rotation plane 102 is provided in the damper mounting groove 101, and a mounting hole 103 is provided on the mounting groove anti-rotation plane 102; an air supply channel 104 and a cylindrical hole 105 are provided in the middle of the bearing housing 1.

[0031] like Figure 7 As shown, the bearing inner ring 2 is provided with an axially symmetrical cylindrical mating surface 201, the axial middle plane of the bearing inner ring 2 is provided with an air inlet hole 202, the inner cylindrical surface is provided with an arc boss 203, and the bearing inner ring 2 and the arc boss 203 together form a pressure equalizing groove 204.

[0032] like Figure 8 As shown, an annular cavity 301 is provided inside the damper housing 3, and an anti-rotation boss 302 is provided on the inner wall of the annular cavity 301; a damper anti-rotation plane 303 is provided on the outer cylindrical side of the damper housing 3, and an oil filling hole 304 is provided on the damper anti-rotation plane 303, and damping liquid is injected into the damper through the oil filling hole 304; a housing sealing groove 305 is provided on the end face of the damper housing 3, and a group of threaded holes evenly distributed along the circumferential direction are provided in the housing sealing groove 305.

[0033] like Fig. 9 As shown, the elastic ring 4 is provided with an inner boss 401, an outer boss 402, an oil hole 403 and a rotation-stop notch 404, the interval angle between adjacent inner bosses and outer bosses is 21°~23°, and a plurality of oil holes 403 are provided between adjacent inner bosses 401 and outer bosses 402, and the diameter of the oil holes is 0.3~0.5mm.

[0034] like Fig.10 As shown, the damper inner ring 5 is provided with an extrusion ring 501, and inner ring sealing grooves 502 are provided on both sides of the extrusion ring 501; the matching hole 503 opened in the middle of the damper inner ring 5 is connected with the bearing inner ring by a transition fit to transmit the radial vibration movement of the bearing inner ring to the damper.

[0035] like Fig.11 As shown, a fastening plate anti-rotation plane 601 is provided on the side surface of the annular fastening plate 6, and the annular surface of the annular fastening plate 6 is provided with connecting holes evenly distributed along the circumferential direction.

[0036] The present invention designs the elastic ring type squeeze film damper module as a full-circle structure, which can withstand the vibration movement of the inner ring of the bearing in any radial direction, provide good damping capacity for the bearing, and improve the stability of the bearing. At the same time, the elastic ring can provide elastic support for the bearing; and by axially symmetrically arranging two full-circle structure damper modules in the bearing housing, the rotor in the bearing is allowed to produce a certain degree of axial tilt and misalignment, so that the bearing has good adaptability, while also reducing the number of dampers in the bearing and improving the reliability of the bearing.

[0037] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module, characterized in that: The invention comprises a bearing housing (1), a bearing inner ring (2) axially arranged in the bearing housing (1), a porous sleeve (9), and a damper module arranged between the bearing housing (1) and the bearing inner ring (2), wherein the damper module is composed of a damper housing (3), an elastic ring (4), a damper inner ring (5), an annular fastening plate (6), a sealing gasket (7) and a sealing ring (8); The bearing housing (1) has damper mounting grooves (101) symmetrically arranged at both axial ends thereof, a cylindrical hole (105) with a small aperture arranged in the middle thereof and the two damper mounting grooves (101) are connected via the cylindrical hole (105), an air supply channel (104) penetrating the cylindrical hole (105) is arranged in the middle of the outer wall thereof, and a mounting groove anti-rotation plane (102) is arranged on the inner wall of the damper mounting groove (101) along the axial direction; The outer circumferential surface of the bearing inner ring (2) is arranged as a profile structure corresponding to the inner cavity of the bearing housing (1), the two ends of the outer circumferential surface are arranged as cylindrical mating surfaces (201), the inner wall of the inner circumferential surface is arranged with a pressure equalizing groove (204), and the middle part of the outer circumferential surface is arranged with an air inlet (202) connecting the pressure equalizing groove (204) and the air supply channel (104); The outer circumferential surface of the damper housing (3) is arranged in close contact with the inner wall of the damper mounting groove (101); a damper anti-rotation plane (303) matching with the mounting groove anti-rotation plane (102) is arranged on the outer circumferential surface; an annular cavity (301) is arranged in the axial interior thereof; a housing sealing groove (305) is arranged on the outer end surface thereof; a sealing gasket (7) is connected in a matching manner in the housing sealing groove (305); A matching hole (503) is provided in the axial interior of the damper inner ring (5), the matching hole (503) is matched and connected to the outer circumferential surface of the cylindrical matching surface (201), the outer circumferential surface of the damper inner ring (5) is provided as an extrusion ring (501), and inner ring sealing grooves (502) are provided on both side end surfaces of the extrusion ring (501), and a sealing ring (8) is matched and connected in the inner ring sealing groove (502); The inner and outer annular surfaces of the elastic ring (4) are respectively provided with inner bosses (401) and outer bosses (402) staggered in the axial direction, and the annular surface of the elastic ring (4) between the inner bosses (401) and the outer bosses (402) is also provided with a plurality of oil holes (403) in the radial direction, wherein the inner bosses (401) are in contact with the outer annular surface of the extrusion ring (501) to separate the inner oil film layer of the damper into a plurality of inner oil films (11), and the outer bosses (402) are in contact with the annular cavity (301) to separate the outer oil film layer of the damper into a plurality of outer oil films (12), and two adjacent inner oil films (11) and outer oil films (12) are connected via the oil holes (403); A fastening plate anti-rotation plane (601) is provided on the side surface of the annular fastening plate (6), and the fastening plate anti-rotation plane (601) is arranged corresponding to the damper anti-rotation plane (303). The two are circumferentially fixedly connected in the bearing housing (1) by matching with the mounting groove anti-rotation plane (102), and the inner ring surface of the annular fastening plate (6) is in close contact with the sealing gasket (7) and the sealing ring (8), and the outer ring surface of the annular fastening plate (6) is flush with the outer end surface of the bearing housing (1).

2. A porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1, characterized in that: A mounting hole (103) is radially penetrated on the mounting groove anti-rotation plane (102), and an oil injection hole (304) is radially penetrated on the damper anti-rotation plane (303). The mounting hole (103) and the oil injection hole (304) are arranged at corresponding positions and are sealed and connected by a sealing bolt (10). The damper module is axially fixed by the sealing bolt (10).

3. The porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1, characterized in that: A rotation-stop boss (302) is provided on the bottom of the inner wall of the annular cavity (301), and a rotation-stop notch (404) is provided on the elastic ring (4) at the center of the end face of the outer boss (402). The elastic ring (4) and the damper housing (3) are circumferentially fixed via the matching connection between the rotation-stop notch (404) and the rotation-stop boss (302).

4. The porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1, characterized in that: The inner bosses (401) and the outer bosses (402) on the elastic ring (4) are evenly distributed along the circumferential direction, and the interval angle between two adjacent inner bosses (401) and outer bosses (402) is 21° to 23°. The diameter of the oil hole (403) is 0.3 to 0.5 mm.

5. The porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1, characterized in that: The matching hole (503) and the bearing inner ring (2) are connected by a transition fit.

6. A porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1 or 5, characterized in that: Circular arc bosses (203) are symmetrically arranged at both ends of the inner circular surface of the bearing inner ring (2) and are evenly distributed in the circumferential direction. The gap between the circular arc bosses (203) and the inner circular surface of the bearing inner ring (2) constitutes a pressure equalizing groove (204). The outer wall of the porous sleeve (9) is tightly attached to the inner circular surface of the circular arc bosses (203) of the bearing inner ring (2) and is bonded and connected to the inner circular surface of the circular arc bosses (203).

7. A porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 6, characterized in that: The porous sleeve (9) is configured as a full-circumference annular column structure, and the outer diameter of the porous sleeve (9) is the same as the inner diameter of the circular arc boss (203).

8. The porous hydrostatic gas radial bearing with an elastic ring type squeeze film damper module according to claim 1, characterized in that: The housing sealing groove (305) is provided with a plurality of threaded holes evenly distributed in the circumferential direction, the annular surface of the annular fastening plate (6) is provided with a plurality of connection holes evenly distributed in the circumferential direction, and the annular fastening plate (6) is fixed to the damper housing (3) by bolts correspondingly connected in the connection holes and the threaded holes.

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