CN115992846A - Double-rotation-direction foil pneumatic dynamic bearing - Google Patents
Double-rotation-direction foil pneumatic dynamic bearing Download PDFInfo
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- CN115992846A CN115992846A CN202310164327.1A CN202310164327A CN115992846A CN 115992846 A CN115992846 A CN 115992846A CN 202310164327 A CN202310164327 A CN 202310164327A CN 115992846 A CN115992846 A CN 115992846A
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Abstract
The invention provides a double-rotation-direction foil gas dynamic pressure bearing, relates to the technical field of radial gas dynamic pressure bearings, and solves the technical problem that the existing radial gas dynamic pressure bearing can only rotate in one direction and cannot rotate in two directions. The device of the invention comprises: the device comprises a main foil, an auxiliary supporting foil, a bearing sleeve, a baffle plate and screws. The main foils are uniformly distributed in the bearing sleeve and are mutually overlapped to form a multi-section arc-shaped bearing supporting surface by combined action, so that the foil pushing effect of the traditional gas dynamic pressure bearing is replaced; the placement direction of the auxiliary supporting foil is opposite to the direction of the main foil, and the auxiliary supporting foil continuously passes through a plurality of slots on a plurality of main foils to form a foil assembly which is mutually intersected with the main foil, so that the auxiliary supporting foil has certain supporting rigidity and damping to support the load of the rotor; the inner diameter of the baffle is smaller than that of the bearing sleeve, and the baffle is fixed on the bearing sleeve through screws to restrain the axial movement of the foil assembly and allow the foil assembly to move circumferentially; the bearing housing is used for supporting the foil assembly and can also be replaced by a bearing housing. Compared with the traditional gas dynamic pressure bearing, the invention allows the rotor to rotate bidirectionally, has high stability, simple supporting structure, low processing price and easy installation and maintenance.
Description
Technical Field
The invention relates to the technical field of radial gas dynamic pressure bearings, in particular to a double-rotation-direction foil gas dynamic pressure bearing.
Background
The gas dynamic pressure bearing is a dynamic pressure bearing which uses the ambient gas as a lubricating medium, and a high-speed rotor drags the ambient gas into a wedge-shaped space surrounded by a rotor and a bearing supporting surface to form a dynamic pressure effect, so that a high-pressure air film is generated, the rotor load is supported, an oil lubrication system in the sliding bearing is eliminated, and the gas dynamic pressure bearing has the advantages of oil-free lubrication, low energy consumption, high efficiency output and the like, and is widely applied to high-performance mechanical equipment such as micro gas turbines, oil-free turbochargers, fuel cell air compressors, air refrigerators and the like.
Currently, the most widely used radial gas dynamic pressure bearings are a wave foil type gas dynamic pressure bearing and a multi-blade type gas dynamic pressure bearing, wherein the bearing supporting surface of the wave foil type gas dynamic pressure bearing, namely one end of a top foil is fixed, one end of the top foil is freely lapped on the foil, the bearing supporting surface of the bottom foil is fixed, one end of the blade is freely lapped on the adjacent blade, the structural characteristics of the two bearing supporting surfaces only allow the rotor to rotate in a single direction, the rotor cannot reversely rotate, or an effective dynamic pressure effect cannot be formed, and the bearing supporting surface is stuck to the rotor to be worn and burnt. In addition, the problem of subsynchronous vibration stability induced by the gas dynamic bearing is a principle constraint problem of limiting the development of the gas dynamic bearing to a higher speed, and is not solved well at present, because the gradient speed exists in an intermediate air film due to the high-speed rotation of the rotor surface and the zero-speed rotation of the bearing supporting surface, and the gradient speed can automatically excite the rotor system at a certain speed moment, so that subsynchronous resonance of the rotor is caused, and the stability of the system is influenced.
Disclosure of Invention
Aiming at the technical defects, the invention provides a double-rotation-direction foil gas dynamic pressure bearing to solve the technical problems that the existing radial foil gas dynamic pressure bearing can only rotate in the direction and has poor system stability. The preferred technical solutions of the technical solutions provided by the present invention can produce a plurality of technical effects described below.
In order to achieve the technical purpose, the invention provides the following technical scheme:
the invention provides a double-rotation-direction foil pneumatic dynamic pressure bearing which comprises a bearing sleeve, a baffle plate, screws and a foil assembly, wherein the foil assembly consists of a plurality of main foils and a plurality of auxiliary support foils.
The main foils are uniformly placed in the bearing sleeve in one direction, one end of each main foil is in contact with the bearing sleeve, the other end of each main foil is lapped on the adjacent main foil, the main foils are lapped sequentially, a plurality of sections of arc-shaped bearing supporting surfaces are formed in a surrounding mode, a plurality of amplifying areas and converging areas for accommodating gas are formed in the circumferential direction after the main foils are matched with the outer surface of the rotor, and a high-pressure gas film is formed by the dynamic pressure effect of the gas in the converging areas so as to support the weight of the rotor. The number of main foils (3) and their circumferential length also influence the number of gas convergence zones.
The main foil is provided with a plurality of slotted holes along the circumferential direction, the width of each slotted hole is slightly larger than that of each auxiliary supporting foil, and the number of the slotted holes is consistent with the number of the main foil contacted with the auxiliary supporting foil; and the side line of the slot hole is subjected to fillet treatment, so that stress concentration is avoided.
The direction of the placement of the auxiliary supporting foil is consistent and opposite to the direction of the placement of the main foil, a single auxiliary supporting foil sequentially penetrates through a plurality of slots on the main foil to form an interdigitated structure with the main foil, the interdigitated structure can generate certain deformation after being loaded and has elastic rigidity, and meanwhile, the auxiliary supporting foil limits the movement of the main foil through the interdigitated structure, so that the main foil is not separated from the auxiliary supporting foil when the rotor rotates bidirectionally.
One end of the auxiliary supporting foil is contacted with the bearing sleeve, the other end of the auxiliary supporting foil is contacted with the lower surface of the end part of the main foil, the end part of the main foil is supported, the number of the auxiliary supporting foil is not fixedly related to the number of the main foil, and the number of the auxiliary supporting foil is determined according to actual needs.
The surface plating treatment of the main foil reduces the friction between the surface and the rotor; and the auxiliary supporting foil and the bearing sleeve are subjected to surface coating treatment, so that the friction force between the foil assembly and the bearing sleeve is small.
The main foil and the auxiliary support foil need to be subjected to certain heat treatment and burr treatment, so that the material has certain elastic rigidity and relative movement.
The inner diameter of the baffle is smaller than that of the bearing sleeve, the baffle is fixed on the bearing sleeve through screws, axial movement of the foil assembly can be restrained, circumferential movement of the foil assembly is allowed, subsynchronous vibration of the system can be effectively reduced, and stability of the system is greatly improved.
The bearing housing supports the foil assembly and the baffle.
Alternatively, the main foil may be arc-shaped or straight, so as to enhance the preloading effect of the convergence region formed between the main foil and the rotor, and the number of the main foils may be determined according to actual needs.
Optionally, the number of slots on the main foil can be increased or decreased in the axial direction and the circumferential direction according to actual requirements, but cannot be less than 1, and the number, the circumferential direction and the axial length of the corresponding auxiliary support foil are changed, so that the elastic rigidity of the foil assembly in the axial direction or the circumferential direction is adjusted.
Alternatively, the slots on the main foil do not require the same size and position distribution in the axial and circumferential directions, and the slots need to be formed on the main foil according to the placement position of the auxiliary support foil.
Optionally, one end of the auxiliary supporting foil contacts with the bearing sleeve, a certain tiny distance exists between the other end of the auxiliary supporting foil and the lower surface of the end part of the main foil, and at the moment, a certain supporting rigidity function is lapped between the main foils, and when the main foil is deformed and is in supporting contact with the auxiliary foil, the supporting rigidity is increased, and a supporting effect of rigidity changing is generated.
Optionally, the auxiliary supporting foil may have a T-shaped structure, and the wide end may contact the bearing sleeve or contact the end of the main foil; the main foil can be of a T-shaped structure, the main foils at the wide ends are sequentially overlapped, the narrow ends are contacted with the bearing sleeve, and the main foil passes through the slotted holes in the auxiliary supporting foil to form a foil assembly of a cross structure.
Optionally, the number of the auxiliary support foils in the axial direction may be even or odd.
Optionally, the foil assembly formed by the main foil and the auxiliary supporting foil is in contact relation with the bearing sleeve, and fixing modes such as welding, pin shaft fixing and the like can be used, but the foil assembly cannot rotate along with the rotor after fixing.
Optionally, the baffle can be omitted in the case of a limit mechanism on the bearing seat.
Optionally, the bearing housing is used to support the foil assembly, and may be replaced by a bearing housing.
Optionally, the bearing sleeve is provided with a plurality of grooves in the circumferential direction in the axial direction, so that friction force between the bearing sleeve and the main foil and the auxiliary supporting foil is reduced, and supporting effects on the main foil and the auxiliary supporting foil are not affected.
Optionally, the main foil and the auxiliary supporting foil can be provided with folded edges at the positions where the main foil and the auxiliary supporting foil are in contact with the bearing sleeve, the folded edges are plugged into grooves of the bearing sleeve, movement of the foil assembly in the circumferential direction is limited, and the preload effect, the convergence domain and the amplification domain formed by the main foil and the auxiliary supporting foil are unchanged.
According to the double-rotation-direction foil pneumatic dynamic pressure bearing provided by the invention, a plurality of main foils are uniformly distributed in the bearing sleeve and mutually overlapped to form a multi-section arc bearing supporting surface by combined action, so that the top foil effect of the traditional pneumatic dynamic pressure bearing is replaced, and a plurality of convergence domains are provided to support the weight of a rotor; the auxiliary supporting foil is placed in the opposite direction to the main foil, continuously passes through a plurality of slots on a plurality of main foils, and forms a foil assembly which is mutually intersected with the main foil, so that the auxiliary supporting foil has certain supporting rigidity and damping supporting rotor load, the rotor can generate effective dynamic pressure effect no matter in forward rotation or in reverse rotation, the phenomenon that a single main foil is dragged by the rotor is avoided, and meanwhile, the multi-section arc formed by the main foil has the preloading effect and the rotatable characteristic of the foil assembly, so that the stability of a system is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only examples of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a partial cross-sectional view of a dual-rotation foil gas dynamic bearing provided by an embodiment of the invention.
Fig. 2 is an exploded view of a double-flighted foil gas dynamic pressure bearing according to an embodiment of the present invention.
Fig. 3 is a front view of a dual-rotation foil gas dynamic bearing according to an embodiment of the present invention.
Fig. 4 is a schematic view of another type of bearing sleeve of a dual-rotation foil gas dynamic bearing according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of another type of structure of an auxiliary support foil of a dual-rotation-direction foil gas dynamic bearing according to an embodiment of the present invention.
Fig. 6 is an exploded view of another type of structure of a double-flighted foil gas dynamic pressure bearing according to an embodiment of the present invention.
Description of the embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
In the description of the present invention, it is to be noted that, unless otherwise indicated, the meaning of "plurality" means two or more; the terms "upper," "lower," "inner," "outer," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "primary," "secondary," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified and defined, the term "preloaded" should be interpreted in a broad sense, for example, as a pre-load applied before the rotor is installed, or as a structural form acting as a pre-load applied with the same effect as that of the pre-load, and it will be apparent to those skilled in the art that the specific meaning of the term in the present invention is understood as appropriate.
The invention provides a double-rotation-direction foil pneumatic dynamic pressure bearing, which comprises a bearing sleeve (1), a baffle (5), screws (6), a plurality of main foils (3) and a plurality of auxiliary support foils (2) which form a foil assembly.
The main foils (3) are placed in the bearing sleeve (1) in the same direction and uniformly distributed, one end of each main foil is in contact with the bearing sleeve (1), the other end of each main foil is lapped on the adjacent main foil (3), the main foils (3) are lapped sequentially to surround a plurality of sections of arc-shaped bearing supporting surfaces, a plurality of amplifying areas and converging areas for containing gas are surrounded by the bearing supporting surfaces and the outer surface of the rotor in the circumferential direction, and the rotor weight is supported by the aerodynamic effect in the converging areas.
The circumferential length of the main foil (3) has a relatively large influence on the number of the amplifying domains and the converging domains of the air film, and the number of the amplifying domains and the converging domains has an influence on the stability and the bearing capacity of the system, so that the circumferential length of the main foil (3) is reasonably selected according to the requirements of the stability and the bearing capacity of the system; the surface of the main foil (3) is subjected to plating treatment, so that the contact friction and abrasion between the surface and the rotor are reduced, and the take-off rotating speed and the take-off torque are reduced; the surface plating treatment of the auxiliary support foil (2) and the bearing sleeve (1) ensures that the friction force between the foil assembly and the bearing sleeve (1) is smaller.
The main foil (3) is provided with a plurality of slots (4) along the circumferential direction, the width of each slot (4) is slightly larger than that of each auxiliary supporting foil (2), the number of the slots (4) in the circumferential direction is consistent with the number of the plurality of main foils (3) which are contacted with the single auxiliary supporting foil (3), and the number of the axial slots (4) is consistent with the axial number of the auxiliary supporting foils (2); the slots (4) on the main foil (3) are not required to be identical in size and position distribution in the axial direction and the circumferential direction, and the slots (4) are required to be formed on the main foil (3) according to the placement position of the auxiliary support foil (2); the number of the slotted holes (4) on the main foil (3) can be increased or reduced in the axial direction and the circumferential direction according to actual demands, but cannot be less than 1, and the number, the circumferential direction and the axial length of the corresponding auxiliary support foil (2) are changed, so that the elastic rigidity of the foil assembly in the axial direction or the circumferential direction is adjusted; in addition, the edge of the slot hole (4) should be rounded to avoid stress concentration.
The placement direction of the auxiliary supporting foils (2) is consistent and opposite to the placement direction of the main foils (3), and a single auxiliary supporting foil (2) sequentially passes through a plurality of slots (4) on a plurality of main foils (3) to form a foil assembly which is mutually intersected with the main foils (3); the foil assembly can apply a certain preload to the main foil (3) and the auxiliary support foil (2), can generate a certain deformation after bearing the rotor load, has elastic rigidity and friction damping, and meanwhile, the auxiliary support foil (2) limits the movement of the main foil (3) through the foil assembly, so that the main foil (3) is not separated from the auxiliary support foil when the rotor rotates bidirectionally.
One end of the auxiliary supporting foil (2) is contacted with the bearing sleeve (1), the other end of the auxiliary supporting foil is contacted with the lower surface of the end part of the main foil (2), the end part of the main foil (3) is supported, the number of the auxiliary supporting foils (2) is not fixedly related to the number of the main foils, and the number of the auxiliary supporting foils in the circumferential direction and the axial direction are determined according to actual needs.
The main foil (3) and the auxiliary support foil (2) need to be subjected to certain heat treatment, so that the material has certain elastic rigidity; and the burr treatment is carried out, so that the relative movement between the two parts can be ensured.
The inner diameter of the baffle (5) is smaller than that of the bearing sleeve, the baffle is fixed on the bearing sleeve (1) through the screw (6), so that the axial movement of the foil assembly can be restrained, the circumferential movement of the foil assembly is allowed, the relative speed of a multi-section arc bearing supporting surface formed by the rotor surface and the main foil is reduced, namely the half-speed excitation of a gas film is improved, the subsynchronous vibration of the system can be effectively reduced, and the stability of the system is greatly improved.
The bearing sleeve (1) supports the main foil (3), the auxiliary support foil (2) and the baffle (5).
As an alternative embodiment, the main foil (3) may be curved or may be a straight structure, aiming at enhancing the preload effect of the convergence field formed between the main foil (3) and the rotor.
As an alternative implementation mode, one end of the auxiliary supporting foil (2) is contacted with the bearing sleeve (1), a certain tiny distance exists between the other end of the auxiliary supporting foil and the lower surface of the end part of the main foil (3), a certain supporting rigidity function is lapped between the main foils (3), and after the main foil (3) is deformed and contacted with the auxiliary foil support (2), the supporting rigidity is increased, and a variable-rigidity supporting effect is generated; the contact position of the auxiliary supporting foil (2) and the main foil (3) can be provided with a tiny groove, so that the auxiliary supporting foil and the main foil can rotate relatively, but mutual sliding is reduced.
As an alternative embodiment, the auxiliary supporting foil (2) can be of a T-shaped structure, and the wide end of the auxiliary supporting foil can be in contact with the bearing sleeve (1) or the end of the main foil (3); the main foil (3) can be of a T-shaped structure, the main foils (3) at the wide ends are sequentially overlapped, the narrow ends are contacted with the bearing sleeve (1) and pass through the slotted holes (4) on the auxiliary supporting foil (2) to form a foil assembly of a cross structure.
As an alternative embodiment, the foil assembly formed by the main foil (3) and the auxiliary support foil (2) is in contact relation with the bearing sleeve (1), and a fixing mode of welding, pin shaft fixing and the like can be used, but the foil assembly cannot rotate along with the rotor after fixing.
As an alternative embodiment, the baffle (5) can be omitted in the case of a limiting mechanism on the bearing seat.
As an alternative embodiment, the bearing housing (1) is used for supporting the foil assembly, and may also be replaced by a bearing housing.
As an alternative embodiment, the bearing sleeve (1) is provided with a plurality of grooves in the circumferential direction in the axial direction, so that the friction force between the bearing sleeve and the main foil (3) and the auxiliary support foil (2) is reduced, but the supporting effect on the main foil (3) and the auxiliary support foil (2) is not affected.
As an alternative embodiment, the main foil (3) and the auxiliary support foil (2) can be provided with folds at the contact positions with the bearing sleeve (1), and are plugged into the grooves of the bearing sleeve (1) to limit the movement of the foil assembly in the circumferential direction, but the preloading effect, the convergence domain and the amplification domain formed by the main foil (3) and the auxiliary support foil (2) are unchanged.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The double-rotation-direction foil pneumatic dynamic pressure bearing is characterized by comprising a bearing sleeve (1), a baffle (5), screws (6) and a foil assembly supported by the bearing sleeve (1), wherein the foil assembly consists of a plurality of main foils (3) and a plurality of auxiliary support foils (2); the main foils (3) are uniformly arranged in the bearing sleeve in the same direction, one end of each main foil is in contact with the bearing sleeve, the other end of each main foil is lapped on the adjacent main foil, a plurality of main foils (3) surround a multi-section arc-shaped bearing supporting surface, a plurality of convergence domains are provided for supporting the weight of the rotor, and the number of the main foils (3) can be determined according to actual needs; the placement direction of the auxiliary support foils (2) is consistent and opposite to the placement direction of the main foils (3), a single auxiliary support foil (2) sequentially penetrates through a plurality of slots (4) on the main foils (3) to form a structure intersecting with the main foils, one end of the auxiliary support foil (2) is contacted with a bearing sleeve, the other end of the auxiliary support foil is contacted with the lower surface of the end part of the main foil (3), the end part of the main foil (3) is supported, the number of the auxiliary support foils (2) is not fixedly related to the number of the main foils (3), and the number of the auxiliary support foils is determined according to actual needs; the inner diameter of the baffle plate (5) is smaller than that of the bearing sleeve, and the baffle plate is fixed on the bearing sleeve through screws, so that the axial movement of the foil assembly can be restrained, but the circumferential movement of the foil assembly is allowed. The bearing sleeve (1) supports the foil assembly and the baffle (5).
2. The double-rotation-direction foil aerodynamic bearing according to claim 1, characterized in that the main foil (3) is provided with a plurality of slots (4) along the circumferential direction, the width of the slots (4) is slightly larger than the width of the auxiliary support foil (2), and the number of the slots (4) is consistent with the number of the main foil (3) contacting the auxiliary support foil (2); and the edge of the slot hole (4) is subjected to fillet treatment, so that stress concentration is avoided.
3. A twin-turn foil gas dynamic pressure bearing as defined in claim 1, wherein the main foil (3) is placed in one direction with one end in contact with the bearing housing (1) and the other end in overlap with an adjacent main foil, and wherein a plurality of segments of arcuate bearing support surfaces formed by the plurality of main foils (3) cooperate with the rotor outer surface to create a plurality of gas-containing amplification and convergence zones in the circumferential direction, the number of which is related to the circumferential length of the main foil (3).
4. The double-rotation-direction foil aerodynamic bearing according to claim 1, characterized in that the direction in which the auxiliary support foils (2) are placed is identical and opposite to the direction in which the main foils (3) are placed, a single auxiliary support foil (2) sequentially passes through a plurality of slots (4) on a plurality of the main foils (3) to form an interdigitated structure with the main foils (3), the interdigitated structure can generate a certain deformation after being loaded and has elastic rigidity, and the auxiliary support foils (2) limit the movement of the main foils (3) through the interdigitated structure to realize the bidirectional rotation of the rotor.
5. The double-rotation-direction foil pneumatic dynamic bearing according to claim 1, wherein one end of the auxiliary supporting foil (2) is contacted with the bearing sleeve (1), and the other end is contacted with the lower surface of the end part of the main foil (3), so that the end part of the main foil (3) can be supported, and a certain tiny distance can be formed between the auxiliary supporting foil and the lower surface of the end part of the main foil (3) for generating a rigidity-variable supporting effect.
6. The double-rotation-direction foil aerodynamic bearing according to claim 1, characterized in that the foil assembly composed of the main foil (3) and the auxiliary support foil (2) is in contact with the bearing housing (1), and fixing means in the form of welding, pin fixing and the like can be used.
7. The double-swivel foil hydrodynamic bearing according to claim 1, wherein the bearing housing (1) is used for supporting the foil assembly, and may also be replaced by a bearing housing.
8. The double-rotation foil pneumatic dynamic pressure bearing according to claim 1, wherein the inner diameter of the baffle (5) is smaller than the inner diameter of the bearing sleeve (1), the baffle is fixed on the bearing sleeve (1) through a screw (6), the axial movement of a foil assembly formed by the main foil (3) and the auxiliary support foil (2) is restrained, the circumferential movement of the foil assembly is allowed, the subsynchronous vibration of a system can be effectively reduced, and the stability of the system is greatly improved; the baffle (5) can be removed under the condition that a limit mechanism is arranged on the bearing seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310164327.1A CN115992846A (en) | 2023-02-24 | 2023-02-24 | Double-rotation-direction foil pneumatic dynamic bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310164327.1A CN115992846A (en) | 2023-02-24 | 2023-02-24 | Double-rotation-direction foil pneumatic dynamic bearing |
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| CN115992846A true CN115992846A (en) | 2023-04-21 |
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| CN202310164327.1A Pending CN115992846A (en) | 2023-02-24 | 2023-02-24 | Double-rotation-direction foil pneumatic dynamic bearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658516A (en) * | 2023-06-01 | 2023-08-29 | 南华大学 | Leaf vein type double-rotation foil pneumatic dynamic pressure bearing |
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2023
- 2023-02-24 CN CN202310164327.1A patent/CN115992846A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658516A (en) * | 2023-06-01 | 2023-08-29 | 南华大学 | Leaf vein type double-rotation foil pneumatic dynamic pressure bearing |
| CN116658516B (en) * | 2023-06-01 | 2024-02-23 | 南华大学 | Leaf vein type double-rotation foil pneumatic dynamic pressure bearing |
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