A two-stage gas film pressure regulated radial bearing and support system for high-speed rotors

Abstract

A two-stage gas film pressure regulating radial bearing and support system for high-speed rotors belongs to the field of gas bearing and high-speed rotor support technology. It solves the problem that existing air-bearing radial bearings, under high-speed rotation conditions, suffer from insufficient gas film pressure maintenance capacity and significant pressure attenuation in the load-bearing area due to increased radial gas leakage, leading to a loss of radial support stiffness and making it difficult to meet the high stiffness, low runout, and stable support requirements of high-speed rotors. This bearing features a two-stage gas film pressure regulating structure: the first stage is a multi-hole throttling device on the stator side, which throttles the external gas supply and introduces it into the gap to form a basic static pressure load-bearing gas film; the second stage is a dynamic pressure microstructure located on the working surface, including a main flow channel and an adjacent auxiliary pressurizing microstructure. During rotor rotation, the pressure is increased in two stages through dynamic pressure enrichment, forming a composite gas film pressure field. This bearing is suitable for high-speed rotating systems such as high-speed polygonal scanning rotors, high-speed motor rotors, high-speed spindle rotors, and precision optomechanical rotors.

Description

Technical Field

[0001] This invention belongs to the field of gas bearing and high-speed rotor support technology, specifically relating to a two-stage gas film pressure regulating gas radial bearing for high-speed rotors. Background Technology

[0002] High-speed rotor systems are widely used in opto-mechatronic equipment such as high-speed beam scanning, precision testing, high-speed motors, ultra-precision machining, and inertial instruments. With the increasing demands for operating speed and operational stability, rotor systems are facing higher requirements for the load-bearing capacity, film stiffness, disturbance resistance, rotational accuracy, and clean operation capabilities of radial support components.

[0003] Traditional rolling bearings are prone to problems such as frictional heat generation, wear, vibration, lubrication contamination, and limited lifespan during high-speed operation, making it difficult to meet the requirements of high-speed, long-term, low-vibration operation. Gas bearings utilize a gas film between the rotor and stator to form a non-contact support, offering advantages such as low friction, no oil contamination, suitability for high-speed operation, and high rotational accuracy. Based on the different methods of gas film pressure formation, gas bearings can generally be divided into hydrostatic gas bearings, hydrodynamic gas bearings, and hydrostatic-hydrodynamic hybrid gas bearings. Hydrostatic gas bearings supply compressed gas to the bearing clearance through an external gas supply system, gas supply chamber, and throttling structure, enabling the formation of a basic load-bearing gas film during startup, low-speed, and high-speed phases. Hydrodynamic gas bearings primarily rely on the relative motion between the rotor and stator, causing the gas to undergo dragging, shearing, convergence, and pressure accumulation within the clearance, thereby forming the load-bearing pressure.

[0004] Porous throttling devices are commonly used throttling gas supply structures in hydrostatic gas bearings. The interconnected pores within the porous medium can transform centralized external gas supply into area-distributed gas supply, causing the gas to undergo distributed throttling before entering the radial gas film gap. This helps improve the uniformity of the gas film pressure distribution and the stability of the foundation bearing capacity. However, for high-speed rotors, relying solely on the hydrostatic bearing gas film formed by the porous throttling device may still present problems such as insufficient local pressure regulation capability, limited pressure rise in the bearing area, and insufficient resistance to radial disturbances under high speed, small clearance, light load disturbance, or unbalanced excitation conditions.

[0005] To enhance film pressure regulation capabilities, existing technologies typically incorporate helical grooves, herringbone grooves, wedge-shaped grooves, micro-dimples, or surface textures on the working surfaces of the mover or stator. These surface microstructures alter the film flow state and induce dynamic pressure effects. However, existing groove structures primarily rely on single-groove patterns or single-stage dynamic pressure generation, depending mainly on primary flow guidance, primary compression, or local convergence to achieve pressure boosting. Under high-speed conditions, these structures may still suffer from limited coverage of high-pressure areas, discontinuous pressure distribution, enhanced local leakage, and insufficient secondary pressure regulation capabilities. Particularly in applications such as high-speed polygonal scanning rotors, high-speed motor rotors, and precision optomechanical rotors, rotor radial runout directly impacts scanning trajectory stability, system noise, machining accuracy, or measurement accuracy.

[0006] Therefore, it is necessary to propose a gas radial bearing structure suitable for high-speed rotors, which can further induce the dynamic pressure enrichment effect through dynamic pressure microstructure on the basis of establishing a basic static pressure bearing gas film in the porous throttling device, thereby achieving a two-stage boost and redistribution of gas film pressure, thereby improving the gas film bearing capacity, gas film stiffness and radial support stability of high-speed rotors. Summary of the Invention

[0007] This invention provides a two-stage gas film pressure regulating gas radial bearing and support system for high-speed rotors. The purpose is to solve the problems of insufficient local pressure boost when relying solely on static pressure supply under high-speed conditions, limited foundation bearing capacity and low-speed support capacity when relying solely on a single-stage dynamic pressure microstructure, insufficient gas film pressure distribution regulation capability, insufficient pressure enrichment in the bearing area, and difficulty in further improving gas film stiffness and high-speed stability.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] A two-stage gas film pressure regulated radial bearing for a high-speed rotor includes a stator and a mover. The stator has an inner circular working surface, and the mover is coaxially disposed inside the stator. The outer circumferential surface of the mover is an outer circular working surface opposite to the inner circular working surface of the stator, and a radial gas film gap is formed between the inner circular working surface of the stator and the outer circular working surface of the mover.

[0010] The bearing also includes a primary air film pressure regulation structure and a secondary air film pressure regulation structure.

[0011] The primary air film pressure regulation structure is a porous throttle located on the stator side. The porous throttle is connected to the external air supply channel and the radial air film gap, respectively. It is used to introduce the externally supplied gas into the radial air film gap after being throttled by the porous medium, so as to form a basic static pressure bearing air film and realize the primary increase of air film pressure.

[0012] The secondary gas film pressure regulation structure is a dynamic pressure microstructure disposed on the outer circular working surface of the mover and / or the inner circular working surface of the stator. The dynamic pressure microstructure is used to regulate the local flow boundary and gas film thickness distribution of the gas in the radial gas film gap when the mover rotates, so that the pressure of the basic static pressure bearing gas film is further increased under the action of dynamic pressure enrichment effect, thereby realizing the secondary boost of gas film pressure.

[0013] The dynamic pressure microstructure includes a main flow channel and an auxiliary pressurization microstructure disposed in the vicinity of the main flow channel. The main flow channel is used to induce the gas to form circumferential and axial flow components, and the auxiliary pressurization microstructure is used to locally modulate the gas after it has been guided by the main flow channel, so as to form a composite gas film pressure field with the synergistic effect of static pressure base bearing and dynamic pressure enrichment and repressurization.

[0014] Furthermore, a preferred embodiment is provided: the porous throttling device is made of a porous medium and is any one of an annular porous throttling sleeve, a porous throttling block, a porous throttling layer, or a porous throttling bushing; the inner circumferential surface of the porous throttling device constitutes at least a portion of the inner circular working surface of the stator.

[0015] Furthermore, a preferred embodiment is provided: the stator is provided with an air supply chamber, the air supply chamber is located on the side of the porous throttle that is away from the radial air film gap, the external air supply channel, the air supply chamber, the porous throttle and the radial air film gap are connected in sequence, so that the externally supplied gas is converted into a surface-distributed gas supply through the porous throttle and then flows into the radial air film gap evenly.

[0016] Furthermore, a preferred embodiment is provided: the main flow channel is any one or more combinations of an inclined straight channel, a spiral channel, a herringbone channel, an arc channel, or a variable width channel, and the main flow channel is inclined relative to the axial direction of the mover, for guiding gas to be transported along a preset direction when the mover rotates.

[0017] Furthermore, a preferred embodiment is provided: the auxiliary pressurization microstructure is any one or more combinations of auxiliary grooves, shallow grooves, short grooves, wedge-shaped microgrooves, micro-grooves, micro-protrusions, or local texture structures; the auxiliary pressurization microstructure is disposed at at least one location on one side, both sides, downstream region, inter-groove platform region, or between adjacent main flow channels of the main flow channel.

[0018] Furthermore, a preferred embodiment is provided: a group of the main flow channels and the corresponding auxiliary pressurization microstructures together constitute a composite dynamic pressure control unit; multiple composite dynamic pressure control units are arranged periodically along the circumferential working surface of the mover and / or the inner working surface of the stator; a platform area is provided between adjacent composite dynamic pressure control units, the platform area is used to maintain the continuity of the air film bearing surface and suppress local leakage.

[0019] Furthermore, a preferred embodiment is provided: the hydrodynamic microstructures are distributed on both sides of the axial center plane of the bearing, and are arranged symmetrically about the axial center plane of the bearing. The grooves of the hydrodynamic microstructures located on both sides of the axial center plane of the bearing are inclined in opposite directions, which is used to guide the gas from both ends of the bearing to the axial center when the mover rotates, and form a static pressure-hydrodynamic pressure composite pressure regulating bearing area in the center of the bearing.

[0020] The present invention also provides a two-stage gas film pressure-regulated radial bearing support system for a high-speed rotor, comprising a high-speed rotor and a two-stage gas film pressure-regulated radial bearing as described in any one or more of the above-described embodiments. The two-stage gas film pressure-regulated radial bearing provides radial support for the high-speed rotor and suppresses radial displacement response and radial runout of the high-speed rotor during high-speed operation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] First, the present invention converts the externally supplied gas into a surface-distributed gas supply through a porous throttling device, forming a basic static pressure bearing gas film in the radial gas film gap, thereby achieving a first-level increase in gas film pressure, which is beneficial to improving the basic support capacity of the bearing during the start-up, low-speed and high-speed operation stages.

[0023] Second, this invention induces directional gas transport and local pressure enrichment through dynamic pressure microstructures under high-speed rotation, thereby further increasing the pressure of the static pressure bearing gas film, thus achieving synergistic regulation of static pressure bearing and dynamic pressure enrichment and repressurization.

[0024] Third, the present invention uses the main flow channel and the auxiliary pressurization microstructure to form a composite dynamic pressure control unit, which transforms the air film pressure from a single static pressure support or a single-stage dynamic pressure rise into a two-stage air film pressure control, which is beneficial to expanding the high pressure bearing area and improving the air film bearing capacity and air film stiffness.

[0025] Fourth, this invention is applicable to high-speed rotor support systems such as high-speed polygon scanning rotors, high-speed motor rotors, high-speed spindle rotors, precision optomechanical rotors, and inertial rotors, which helps to improve the low-vibration operation capability and system stability of high-speed rotors. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is an overall structural diagram of the two-stage gas film pressure regulating gas radial bearing for high-speed rotors according to the present invention, wherein 101 is the stator, 102 is the shaft, 103 is the inner working surface of the stator, 104 is the outer working surface of the mover, 105 is the radial gas film gap, and 106 is the dynamic pressure microstructure.

[0028] Figure 2 This is a schematic diagram of the two-stage pressurization microstructure on the outer working surface of the mover, where 201 is the mover shaft, 202 is the platform area, and 203 is the groove area.

[0029] Figure 3 This is a partially enlarged schematic diagram of the composite dynamic pressure boosting unit, where 301 is a single auxiliary slot structure and 302 is a double auxiliary slot structure. Detailed Implementation

[0030] The technical solutions in the embodiments of this application are clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "axial", "radial", "circumferential", "inner", "outer", "upstream", "downstream", etc., indicating the orientation or positional relationship, are based on the orientation shown in the drawings or the flow direction of gas under the dragging action of the mover. They are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0032] Implementation Method 1: Overall Structure of a Two-Stage Gas Film Pressure Regulated Radial Bearing

[0033] like Figure 1 As shown, this embodiment provides a two-stage gas film pressure regulating radial bearing for a high-speed rotor. The bearing includes a stator 101 and a mover 102. The stator 101 has an inner working surface 103 on its inner circumference. The mover 102 is coaxially disposed inside the stator 101 and is capable of high-speed rotation relative to the stator 101 around its own axis. The outer circumferential surface of the mover 102 forms a mover outer working surface 104. The stator inner working surface 103 and the mover outer working surface 104 are opposite to and coaxially disposed, forming a radial gas film gap 105 between them.

[0034] The bearing described in this embodiment includes a two-stage gas film pressure regulation structure, namely a primary gas film pressure regulation structure and a secondary gas film pressure regulation structure, which are connected step by step along the gas pressure formation process.

[0035] The primary air film pressure regulation structure is a porous throttle located on the stator 101 side. The radially outer side of the porous throttle is connected to the external air supply channel, and the radially inner side is connected to the radial air film gap 105. Externally supplied gas, after being input through the external air supply channel, first enters the porous medium inside the porous throttle, and after throttling, enters the radial air film gap 105. Due to the distributed throttling and surface air supply characteristics of the porous medium, the externally supplied gas can be transformed from localized air supply to surface-distributed air supply along the bearing working surface, thereby forming a basic static pressure bearing air film between the stator inner working surface 103 and the mover outer working surface 104, achieving a primary increase in air film pressure.

[0036] The secondary gas film pressure regulation structure is a dynamic pressure microstructure 106 disposed on the outer working surface 104 of the mover and / or the inner working surface 103 of the stator. The dynamic pressure microstructure 106 is used to change the local flow boundary and gas film thickness distribution of the gas in the radial gas film gap 105 when the mover 102 rotates, so that the basic static pressure bearing gas film formed by the primary gas film pressure regulation structure can further generate a dynamic pressure enrichment effect under high-speed rotation conditions, thereby realizing a secondary boost in gas film pressure.

[0037] Specifically, when the mover 102 rotates, the gas in the radial film gap 105 is first provided with basic static pressure support by the porous throttling device. Subsequently, under the shearing and dragging effect generated by the high-speed rotation of the mover 102, the gas undergoes directional transport, local throttling, and pressure recovery as it passes through the dynamic pressure microstructure 106, further enriching the film pressure in the main load-bearing area. As a result, a composite film pressure field is formed in the radial film gap 105, with the synergistic effect of static pressure support and dynamic pressure enrichment, thereby improving the bearing's load-bearing capacity, film stiffness, and high-speed operation stability.

[0038] In this embodiment, the porous throttling device can be any one of an annular porous throttling sleeve, a porous throttling block, a porous throttling layer, or a porous throttling bushing. Preferably, the inner circumferential surface of the porous throttling device constitutes at least a portion of the inner circular working surface 103 of the stator, allowing the throttled gas to directly enter the radial gas film gap 105, thereby reducing pressure loss.

[0039] Optionally, the stator 101 may also be provided with an air supply chamber, which is located on the side of the porous throttle that is away from the radial air film gap 105. The external air supply channel, the air supply chamber, the porous throttle and the radial air film gap 105 are connected in sequence to improve the uniformity of air supply and the stability of the foundation static pressure bearing air film.

[0040] Implementation Method 2: Typical Arrangement of Dynamic Pressure Microstructures and Pressure Re-boosting Methods

[0041] like Figure 2 and Figure 3As shown, this embodiment describes the specific form of the secondary air film pressure regulation structure based on Embodiment 1.

[0042] The dynamic pressure microstructure 106 includes a main flow channel and an auxiliary pressurizing microstructure disposed in the region adjacent to the main flow channel. The main flow channel and the auxiliary pressurizing microstructure are sequentially connected along the gas flow direction. The main flow channel is used to induce the gas in the radial gas film gap 105 to form circumferential and axial flow components, and the auxiliary pressurizing microstructure is used to locally modulate the gas after it has been guided by the main flow channel, so that the gas undergoes dynamic pressure enrichment and pressure re-increase in the bearing area.

[0043] The main flow channel can be any one or more combinations of inclined straight channels, spiral channels, herringbone channels, arc channels, or variable width channels. The main flow channel is inclined relative to the axial direction of the mover 102. When the mover 102 rotates at high speed, the main flow channel guides the gas to be transported along a preset direction, causing the gas to be dragged not only circumferentially but also generating an axial flow component. This structure helps to change the pressure gradient distribution within the radial air film gap 105, further concentrating the static pressure bearing air film of the foundation towards the main bearing area.

[0044] The auxiliary pressurization microstructure can be any one or more combinations of auxiliary grooves, shallow grooves, short grooves, wedge-shaped microgrooves, micro-grooves, micro-protrusions, or local textured structures. The auxiliary pressurization microstructure can be located on one side, both sides, downstream region, inter-groove platform region, or between adjacent main flow grooves. When the mover 102 rotates, the gas guided by the main flow groove enters the active area of ​​the auxiliary pressurization microstructure, causing changes in the local gas film thickness and flow boundary, thereby generating local throttling, secondary shearing, pressure recovery, and dynamic pressure enrichment effects, further increasing the gas film pressure in the local bearing area.

[0045] A set of main flow channels and corresponding auxiliary pressurization microstructures can together constitute a composite dynamic pressure control unit. Multiple composite dynamic pressure control units are arranged periodically along the circumferential working surface 104 of the mover and / or the inner working surface 103 of the stator. A platform area 202 is provided between adjacent composite dynamic pressure control units. The platform area 202 cooperates with the opposite working surface to limit the local gas film thickness, so as to maintain the continuity of the gas film bearing surface and reduce the impact of local leakage on the pressure enrichment effect.

[0046] In a preferred arrangement, the hydrodynamic microstructures 106 are distributed on both sides of the axial center plane of the bearing, and are arranged symmetrically about the axial center plane. The grooves on both sides of the axial center plane of the bearing are inclined in opposite directions. When the mover 102 rotates, the main flow grooves on both sides will guide the gas in the radial gas film gap 105 to converge from both ends of the bearing to the axial center, forming a static-hydrodynamic composite pressure regulating bearing area in the center of the bearing. This arrangement is beneficial to improving the axial symmetry of the gas film pressure distribution, suppressing axial leakage, and enhancing the pressure holding capacity of the bearing's central bearing area.

[0047] In another preferred arrangement, the auxiliary pressurization microstructure adopts a single auxiliary groove structure 301 or a double auxiliary groove structure 302. The single auxiliary groove structure is used to form a single-point pressure boost in a local area after the main flow channel guides the flow. It has a simple structure and is easy to process. The double auxiliary groove structure is used to form a multi-point pressure boost, which can expand the dynamic pressure enrichment area, improve the coverage of the high-pressure area, and enhance the bearing's adaptability to radial disturbances and load changes.

[0048] The dynamic pressure microstructure 106 can be formed on the outer working surface 104 of the mover and / or the inner working surface 103 of the stator by laser etching, micro-milling, precision grinding, electrochemical machining, ultra-precision turning, roll forming, etching, or photolithography. Preferably, the dynamic pressure microstructure 106 is disposed on the outer working surface 104 of the mover, which facilitates processing and inspection, and helps to ensure the consistency of groove cycle, groove depth, and groove width.

[0049] Implementation Method 3: High-speed rotor support system and specific parameter examples

[0050] This embodiment provides a two-stage gas film pressure-controlled radial bearing support system for a high-speed rotor. The system includes a high-speed rotor and the two-stage gas film pressure-controlled radial bearing described in Embodiment 1 or Embodiment 2. The high-speed rotor can be any rotor component requiring high-speed and precision support, such as a high-speed polygonal scanning rotor, a high-speed motor rotor, a high-speed spindle rotor, a precision optomechanical rotor, or an inertial rotor. The radial bearing is mounted on the outer side of the shaft section of the high-speed rotor to provide radial support and suppress radial displacement response and radial runout of the high-speed rotor during high-speed operation.

[0051] When this support system is used for a high-speed polygonal scanning rotor, the mover 102 can be connected to a multifaceted prism rotor, a motor rotor, or a scanning shaft, while the stator 101 provides radial constraint. During operation, the porous throttle first establishes a basic static pressure bearing gas film within the radial gas film gap 105 through external air supply, ensuring that the rotor has a stable non-contact support foundation. When the rotor enters a high-speed rotation state, the dynamic pressure microstructure 106 further induces directional gas transport and dynamic pressure enrichment, thereby increasing the gas film pressure in the main bearing area, thus reducing rotor radial runout and improving scanning trajectory stability and high-speed operation reliability.

[0052] In one specific embodiment, the radial air film gap 105 can be set to 10 μm to 20 μm, the groove depth or characteristic height of the dynamic pressure microstructure 106 can be set to 1 μm to 5 μm, and the inclination angle of the main flow groove relative to the axial direction of the mover 102 can be set to 30° to 60°.

[0053] In the preferred parameter scheme, the radial air film gap 105 is 10 μm, the main flow groove depth is 4 μm, the main flow groove inclination angle is 45°, the effective bearing length is 50 mm, the groove spacing is 0.1 mm to 0.4 mm, and each main flow groove corresponds to one or two auxiliary grooves. The above parameters can be adjusted according to the rotor diameter, bearing length, operating speed, air supply pressure, load requirements, and stability requirements.

[0054] In practical applications, the system can be adapted to different operating conditions through tiered control: when it is necessary to increase the foundation bearing capacity, the pore structure, permeability, air supply pressure, or air supply chamber structure of the porous throttling device can be adjusted to improve the primary air film pressure control effect; when it is necessary to improve the pressure boosting capability under high-speed conditions, the secondary air film pressure control effect can be improved by adjusting the depth, width, inclination angle, axial length, circumferential arrangement, and number of auxiliary pressurizing microstructures of the main flow channel. Therefore, this support system can simultaneously provide static pressure support capability during startup and low-speed phases, as well as dynamic pressure boosting capability during high-speed rotation, making it suitable for high-speed rotor support scenarios with high requirements for low friction, low vibration, high rigidity, and high-speed stability.

Claims

1. A two-stage gas film pressure regulating radial bearing for a high-speed rotor, comprising a stator and a mover, wherein the stator has an inner circular working surface, the mover is coaxially disposed inside the stator, and the outer circumferential surface of the mover is an outer circular working surface opposite to the inner circular working surface of the stator, and a radial gas film gap is formed between the inner circular working surface of the stator and the outer circular working surface of the mover, characterized in that: The bearing also includes a primary air film pressure regulation structure and a secondary air film pressure regulation structure; The primary air film pressure regulation structure is a porous throttle device installed on the stator side. The porous throttle device is connected to the external air supply channel and the radial air film gap, respectively. It is used to introduce the externally supplied gas into the radial air film gap after being throttled by the porous medium, so as to form a basic static pressure bearing air film and realize the primary increase of air film pressure. The secondary air film pressure regulation structure is a dynamic pressure microstructure set on the outer circular working surface of the mover and / or the inner circular working surface of the stator. The dynamic pressure microstructure is used to regulate the local flow boundary and air film thickness distribution of the gas in the radial air film gap when the mover rotates, so that the pressure of the basic static pressure bearing air film is further increased under the action of dynamic pressure enrichment effect, thereby realizing the secondary increase of air film pressure. The dynamic pressure microstructure includes a main flow channel and an auxiliary pressurization microstructure disposed in the region adjacent to the main flow channel. The main flow channel is used to induce the gas to form circumferential flow components and axial flow components. The auxiliary pressurization microstructure is used to locally modulate the gas after it has been guided by the main flow channel, so as to form a composite gas film pressure field with the synergistic effect of static pressure foundation bearing and dynamic pressure enrichment and repressurization.

2. A two-stage gas film pressure regulating gas radial bearing for high-speed rotors according to claim 1, characterized in that, The porous throttling device is made of a porous medium and is any one of an annular porous throttling sleeve, a porous throttling block, a porous throttling layer, or a porous throttling bushing; the inner circumferential surface of the porous throttling device constitutes at least a portion of the inner circular working surface of the stator.

3. A two-stage gas film pressure regulating gas radial bearing for a high-speed rotor according to claim 1, characterized in that, The stator is provided with an air supply chamber, which is located on the side of the porous throttle that is away from the radial air film gap. The external air supply channel, the air supply chamber, the porous throttle and the radial air film gap are connected in sequence, so that the externally supplied gas is converted into a surface-distributed gas supply through the porous throttle and then flows into the radial air film gap evenly.

4. A two-stage gas film pressure regulating gas radial bearing for a high-speed rotor according to claim 1, characterized in that, The main flow channel is any one or more combinations of inclined straight channel, spiral channel, herringbone channel, arc channel or variable width channel. The main flow channel is inclined relative to the axial direction of the mover and is used to guide the gas to be transported in a preset direction when the mover rotates.

5. A two-stage gas film pressure regulating gas radial bearing for a high-speed rotor according to claim 1, characterized in that, The auxiliary pressurization microstructure is any one or more combinations of auxiliary grooves, shallow grooves, short grooves, wedge-shaped microgrooves, micro-grooves, micro-protrusions, or local texture structures. The auxiliary pressurization microstructure is disposed at at least one location on one side, both sides, downstream region, inter-groove platform region, or between adjacent main flow channels of the main flow channel.

6. A two-stage gas film pressure regulating gas radial bearing for a high-speed rotor according to claim 1, characterized in that, A set of the main flow channels and the corresponding auxiliary pressurization microstructures together constitute a composite dynamic pressure control unit; multiple composite dynamic pressure control units are arranged periodically along the circumferential working surface of the mover and / or the inner working surface of the stator; a platform area is provided between adjacent composite dynamic pressure control units, the platform area is used to maintain the continuity of the air film bearing surface and suppress local leakage.

7. A two-stage gas film pressure regulating gas radial bearing for a high-speed rotor according to claim 1, characterized in that, The dynamic pressure microstructures are located on both sides of the axial center plane of the bearing and are arranged symmetrically about the axial center plane of the bearing. The grooves of the dynamic pressure microstructures on both sides of the axial center plane of the bearing are inclined in opposite directions, which are used to guide the gas from both ends of the bearing to the axial center when the mover rotates, and form a static pressure-dynamic pressure composite pressure regulating bearing area in the center of the bearing.

8. A two-stage gas film pressure regulating gas radial bearing support system for a high-speed rotor, characterized in that, The invention includes a high-speed rotor and a two-stage gas radial bearing with film pressure regulation as described in any one of claims 1 to 7, wherein the two-stage gas radial bearing with film pressure regulation is used to provide radial support for the high-speed rotor and to suppress the radial displacement response and radial runout of the high-speed rotor during high-speed operation.

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