CN212868193U - Radial foil hydrodynamic air bearing capable of preventing axial displacement of foil - Google Patents
Radial foil hydrodynamic air bearing capable of preventing axial displacement of foil Download PDFInfo
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- CN212868193U CN212868193U CN202021448256.6U CN202021448256U CN212868193U CN 212868193 U CN212868193 U CN 212868193U CN 202021448256 U CN202021448256 U CN 202021448256U CN 212868193 U CN212868193 U CN 212868193U
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Abstract
The utility model discloses a can prevent radial foil piece dynamic pressure air bearing of foil piece axial aversion, among this air bearing, the both ends of top foil all have bending structure and place in the slot of bearing frame, through installing annular apron in bearing frame stair structure department, and cooperate the setting of foil piece opening structure, can carry out the axial spacingly to bending structure, thereby solved radial foil piece dynamic pressure air bearing in the use, the problem of axial dislocation is followed to top foil, thereby the stability of bearing has been improved, the service life of bearing has been improved.
Description
Technical Field
The utility model relates to an air bearing field especially relates to a can prevent radial foil dynamic pressure air bearing of foil axial aversion.
Background
The foil air bearing is a self-acting dynamic pressure air bearing which adopts air as a lubricating medium, is firstly applied to an environmental control system (ACM) of an airplane in the 70 th century, is gradually popularized to the fields of small turbojet engines, turbine refrigerators, micro gas turbines and the like in the eighty and ninety years, and is further applied and developed to the fields of air suspension centrifugal blowers, electronic turbochargers, compressors for hydrogen fuel cells and the like in the 21 st century. Compared with the traditional high-speed bearing, the foil air bearing has the advantages of simple structure, high rotating speed, low friction power consumption, high and low temperature resistance, good stability, convenience in maintenance and the like, and has wide application prospect in the field of future high-speed rotating machinery.
Generally, a radial foil hydrodynamic air bearing is composed of a top foil and a bump foil, the bump foil is arranged in an inner hole of a bearing seat and is jointed with the inner hole wall of the bearing seat along the circumferential direction, and the top foil is arranged in the bump foil and is jointed with the bump foil along the circumferential direction. The top foil and the wave foil are not closed along the circumferential direction and are in an open structure, wherein one end of the top foil is called a free end, and the other end of the top foil is called a fixed end. From the installation mode of radial foil dynamical pressure air bearing, the fixed end is restrained on the bearing seat completely, and can not move freely along the circumferential direction or the axial direction, and for the top foil, the free end is not restrained, and the free end of the top foil can move in a small range along the circumferential direction, which is necessary for the normal work of the radial foil dynamical pressure air bearing. But the top foil free end can also take place to remove along the axial, also the top foil can take place the axial dislocation, foil dynamic pressure air bearing is when normal work, top foil free end region can not avoid receiving the influence that the shafting vibrates along the axial, the top foil takes place the dislocation along the axial easily, simultaneously because top foil and ripples foil in close contact with, the existence of friction between the two leads to the wave foil free end also to take place the dislocation along the axial easily, this can let the effective work gas film in bearing area distribute inhomogeneously, reduce foil dynamic pressure air bearing's bearing capacity and stability, lead to the shafting to move unstably, the vibration aggravation, perhaps even take place the shafting to burn when serious. At present, no effective method for solving the problem of axial dislocation of the top foil of the radial foil dynamical pressure air bearing exists.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a radial foil dynamic pressure air bearing that can prevent foil axial displacement is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
the utility model provides a can prevent radial foil hydrodynamic air bearing of foil axial displacement, includes bearing frame, bump paper tinsel and the top paper tinsel that is coaxial in proper order, and pretension assembly from outer to interior, its characterized in that:
the bearing seat is characterized in that two ends of the inner edge of the bearing seat are provided with guide rings extending outwards, a stepped structure is formed between the guide rings and the outer edge of the bearing seat, external threads are arranged on the outer wall of each guide ring, a through groove is formed in the inner wall of the bearing seat along the axial direction of the inner wall of the bearing seat, the depth of each through groove is larger than the thickness of each guide ring, and a spacer block for partitioning the through groove into a first slot and a second slot in the circumferential direction is arranged in each through groove;
one end of the wave foil and one end of the top foil are attached to each other and are bent towards the centrifugal direction together to form a fixing part, and the fixing part is inserted into the first slot;
the other end of the wave foil extends along the inner circumferential wall of the bearing seat to form a free end;
the other end of the top foil extends along the inner circumferential wall of the bearing seat and is bent towards the centrifugal direction to form a movable part, the movable part is inserted into the second slot and is tightly attached to the spacer block, and an annular movable gap for the movable part to move away from the spacer block is formed in the second slot; wherein
Two ends of the fixed part and the movable part are provided with notches which are in right angles, so that the tail ends of the fixed part and the movable part are provided with positioning parts which are flush with the end surface of the outer edge of the bearing seat;
the radial foil dynamical pressure air bearing also comprises two annular cover plates, wherein the annular cover plates are connected to the guide ring in a threaded mode, the end faces of the inner sides of the annular cover plates are attached to the end faces of the outer edges of the bearing seats, the inner edges of the end faces of the outer sides of the annular cover plates extend inwards to form an outer positioning ring, and the outer positioning ring can axially limit the bump foil.
The further technical scheme is as follows: the annular cover plate is fixed with the outer edge end face of the bearing seat through a plurality of screws which are circumferentially and uniformly distributed, and screw counter bores are formed in the annular cover plate.
The further technical scheme is as follows: the fixing part is inserted into the first slot and then is arranged close to the spacing block, and a self-adaptive gap for the fixing part to move away from the spacing block is formed in the first slot.
The further technical scheme is as follows: the self-adaptive gap is 0.5-1.5 mm.
The further technical scheme is as follows: and the inner wall of the top foil is provided with a wear-resistant layer.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
in the air bearing, the two ends of the top foil are provided with the bending structures and are arranged in the slots of the bearing seat, the annular cover plate is arranged at the stepped structure of the bearing seat and is matched with the opening structures of the foils, the annular cover plate is clamped at the openings of the foils, and the bending structures can be axially limited, so that the problem that the top foil is axially staggered in the use process of the radial foil dynamic pressure air bearing is solved, the stability of the bearing is improved, and the service life of the bearing is prolonged.
In addition, an outer positioning ring is formed by extending inwards on the inner edge of the outer end of the annular cover plate, the inner diameter of the outer positioning ring is slightly smaller than that of the bearing seat and larger than that of the corrugated foil, so that the outer positioning ring is in partial contact with the end face of the corrugated foil in the axial direction, the corrugated foil is blocked and axially positioned, and the corrugated foil is further prevented from moving and dislocating along the axial direction.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic structural view of the present invention with the annular cover plate hidden;
fig. 3 is a schematic structural view of the present invention with the annular cover plate hidden;
FIG. 4 is a schematic structural view of the ring-shaped cover plate of the present invention;
FIG. 5 is a schematic structural diagram of a medium wave foil according to the present invention;
fig. 6 is a schematic structural diagram of the middle top foil of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 6, a radial foil dynamical pressure air bearing capable of preventing axial displacement of a foil comprises a bearing seat 10, a bump foil 20 and a top foil 30 which are coaxially and pre-assembled from outside to inside in sequence. The bearing seat 10 is manufactured by machining, and the wave foil 20 and the top foil 30 are manufactured by cutting and blanking with laser, hydraulic forming with a die and rolling with a rolling machine. The bump foil 20 is corrugated and includes a bump contacting the top foil 30 and a horizontal connecting section contacting the inner surface of the bearing housing 10, and the bump foil 20 is an elastic supporting member capable of providing elastic support to the top foil 30. When the rotor runs at a high speed, due to the periodic action of the wedge-shaped compressed air film force between the top foil 30 and the rotor, the wavy foil 20 can generate tiny elastic deformation under the action of the air film force and generate tiny sliding with the inner surfaces of the top foil 30 and the bearing seat 10, so that sufficient damping is provided for the high-speed running of the bearing, and the running stability of the rotor is ensured.
According to an embodiment of the radial foil dynamical pressure air bearing capable of preventing axial displacement of the foil, the two ends of the inner edge of the bearing seat 10 are provided with the guide rings 11 extending outwards, a step structure is formed between the guide rings and the outer edge of the bearing seat 10, the outer wall of each guide ring 11 is provided with an external thread, the inner wall of the bearing seat 10 is provided with a through groove along the axial direction of the inner wall, the depth of the through groove is larger than the thickness of the guide ring 11, and the through groove is internally provided with the spacer 12 which divides the through groove into the first slot 13 and the second slot 14 in the circumferential direction. One ends of the bump foil 20 and the top foil 30 are attached to each other and are bent together in the centrifugal direction to form a fixing portion 31, and the fixing portion 31 is inserted into the first slot 13. The other end of the bump foil 20 extends along the inner circumferential wall of the bearing housing 10 to form a free end. The other end of the top foil 30 extends along the inner circumferential wall of the bearing seat 10 and bends towards the centrifugal direction to form a movable part 32, the movable part 32 is inserted into the second slot 14 and is arranged close to the spacer block 12, a circumferential movable gap for the movable part 32 to move away from the spacer block 12 is formed in the second slot 14, the circumferential movable gap is preferably 1.5-2.5 mm, and deformation is provided for the foil. The fixed portion 31 and the movable portion 32 are also left with a displacement amount of radial deformation in the corresponding slots. The two ends of the fixed part 31 and the movable part 32 are provided with notches 33 which are in right angles, so that the tail ends of the fixed part 31 and the movable part 32 are provided with positioning parts which are flush with the end surface of the outer edge of the bearing seat 10.
The radial foil hydrodynamic air bearing further comprises two annular cover plates 40, the annular cover plates 40 are connected to the guide ring 11 in a threaded mode and clamped at the openings 33 of the foils, after the radial foil hydrodynamic air bearing is assembled in place, the end faces of the inner sides of the annular cover plates 40 are attached to the end faces of the outer edges of the bearing seats 10, and axial contact positioning is achieved between the annular cover plates and the positioning portions. The inner edge of the outboard end face of the annular cover plate 40 extends inwardly to form an outer locating ring that axially locates the bump foil.
In the air bearing, both ends of the top foil 30 are provided with bending structures and are arranged in the slots of the bearing seat 10, the annular cover plate 40 is arranged at the stepped structure of the bearing seat and is matched with the opening structure of the foil, the annular cover plate 40 is clamped at the opening 33 of the foil, and the bending structures can be axially limited, so that the problem that the top foil is axially staggered in the use process of the radial foil dynamic pressure air bearing is solved, the stability of the bearing is improved, and the service life of the bearing is prolonged.
In addition, an outer positioning ring is formed on the inner edge of the outer end of the annular cover plate 40 extending inwards, the inner diameter of the outer positioning ring is slightly smaller than that of the bearing seat and larger than that of the bump foil, so that the outer positioning ring is partially contacted with the end face of the bump foil in the axial direction to block the bump foil 20 and axially position the bump foil, and further the bump foil 20 is prevented from moving and dislocating along the axial direction.
The annular cover plate 40 is fixed with the outer edge end face of the bearing seat 10 through a plurality of screws which are circumferentially and uniformly distributed, the annular cover plate 40 is fixed with the bearing seat in a reinforcing mode, screw counter bores are formed in the annular cover plate 40, the screws 41 do not protrude out of the annular cover plate 40 after being installed, and the screws 41 are prevented from falling off due to external force.
The fixing portion 31 is inserted into the first slot 13 and then arranged close to the spacer 12, and the first slot 13 is provided with a self-adaptive gap for the fixing portion 31 to move away from the spacer 12, wherein the self-adaptive gap is 0.5-1.5 mm, and the preferred value is 1 mm. Because the fixed ends of the top foil 30 and the wave foil 20 can also freely move in a small range along the circumferential direction, the fixed ends have a small adjustment amount rotating along with the rotor at the initial movement, and the self-adaptability and the stability of the bearing are further improved.
The rotor starting torque is reduced, abrasion is reduced, the service life is prolonged, the inner wall of the top foil 30 is provided with the wear-resistant layer, the wear-resistant layer is a molybdenum disulfide coating or a polytetrafluoroethylene coating, and the wear-resistant layer can be sprayed and has high friction resistance. The thickness of the wear-resistant layer is 0.02-0.03 mm.
The above is only the preferred embodiment of the present invention, and any person can make some simple modifications, deformations and equivalent replacements according to the present invention, all fall into the protection scope of the present invention.
Claims (5)
1. The utility model provides a can prevent radial foil hydrodynamic air bearing of foil axial displacement, includes bearing frame (10), ripples foil (20) and top foil (30) that from outer to interior coaxial in proper order, and pretension assembly, its characterized in that:
the bearing seat comprises a bearing seat (10), wherein two ends of the inner edge of the bearing seat are provided with guide rings (11) extending outwards, a step structure is formed between the two ends of the inner edge of the bearing seat and the outer edge of the bearing seat (10), the outer wall of each guide ring (11) is provided with an external thread, the inner wall of the bearing seat (10) is provided with a through groove along the axial direction of the inner wall of the bearing seat, the depth of the through groove is greater than the thickness of the guide ring (11), and a spacer block (12) for separating the through groove into a first slot (13) and a second slot (14);
one ends of the wave foil (20) and the top foil (30) are attached to each other and are bent together in the centrifugal direction to form a fixing part (31), and the fixing part (31) is inserted into the first slot (13);
the other end of the wave foil (20) extends along the inner circumferential wall of the bearing seat (10) to form a free end;
the other end of the top foil (30) extends along the inner circumferential wall of the bearing seat (10) and is bent towards the centrifugal direction to form a movable part (32), the movable part (32) is inserted into the second slot (14) and is tightly attached to the spacer block (12), and a circumferential movable gap for enabling the movable part (32) to move away from the spacer block (12) is formed in the second slot (14); wherein
Two ends of the fixed part (31) and the movable part (32) are provided with notches (33) which are in right angles, so that the tail ends of the fixed part (31) and the movable part (32) are provided with positioning parts which are flush with the end surface of the outer edge of the bearing seat (10);
the radial foil hydrodynamic air bearing further comprises two annular cover plates (40), the annular cover plates (40) are in threaded connection with the guide ring (11), the end faces of the inner sides of the annular cover plates are attached to the end faces of the outer edges of the bearing seat (10), the inner edges of the end faces of the outer sides of the annular cover plates extend inwards to form an outer positioning ring (42), and the outer positioning ring (42) can axially limit the bump foil (20).
2. The radial foil hydrodynamic air bearing of claim 1, wherein: the annular cover plate (40) and the outer edge end face of the bearing seat (10) are fixed through a plurality of annularly and uniformly distributed screws (41), and screw counter bores are formed in the annular cover plate (40).
3. The radial foil hydrodynamic air bearing of claim 1, wherein: the fixing part (31) is inserted into the first slot (13) and then is tightly attached to the spacing block (12), and a self-adaptive gap for the fixing part (31) to move away from the spacing block (12) is formed in the first slot (13).
4. The radial foil hydrodynamic air bearing of claim 3, wherein: the self-adaptive gap is 0.5-1.5 mm.
5. The radial foil hydrodynamic air bearing of claim 1, wherein: and the inner wall of the top foil (30) is provided with a wear-resistant layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021448256.6U CN212868193U (en) | 2020-07-21 | 2020-07-21 | Radial foil hydrodynamic air bearing capable of preventing axial displacement of foil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021448256.6U CN212868193U (en) | 2020-07-21 | 2020-07-21 | Radial foil hydrodynamic air bearing capable of preventing axial displacement of foil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212868193U true CN212868193U (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021448256.6U Active CN212868193U (en) | 2020-07-21 | 2020-07-21 | Radial foil hydrodynamic air bearing capable of preventing axial displacement of foil |
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| Country | Link |
|---|---|
| CN (1) | CN212868193U (en) |
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- 2020-07-21 CN CN202021448256.6U patent/CN212868193U/en active Active
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