CN113048145B - Dynamic pressure gas bearing - Google Patents
Dynamic pressure gas bearing Download PDFInfo
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- CN113048145B CN113048145B CN201911363114.1A CN201911363114A CN113048145B CN 113048145 B CN113048145 B CN 113048145B CN 201911363114 A CN201911363114 A CN 201911363114A CN 113048145 B CN113048145 B CN 113048145B
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- dynamic pressure
- pressure gas
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- 239000011888 foil Substances 0.000 claims abstract description 245
- 230000008093 supporting effect Effects 0.000 claims abstract description 38
- 238000005452 bending Methods 0.000 claims description 25
- 238000003466 welding Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/30—Material joints
- F16C2226/36—Material joints by welding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/30—Material joints
- F16C2226/40—Material joints with adhesive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/50—Positive connections
- F16C2226/52—Positive connections with plastic deformation, e.g. caulking or staking
- F16C2226/54—Positive connections with plastic deformation, e.g. caulking or staking with rivets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/50—Positive connections
- F16C2226/62—Positive connections with pins, bolts or dowels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/23—Gas turbine engines
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Support Of The Bearing (AREA)
Abstract
The application provides a dynamic pressure gas bearing, which comprises a bearing sleeve and a plurality of groups of foil groups distributed on the inner side of the bearing sleeve; a plurality of fixing positions are circumferentially distributed on the inner wall of the bearing sleeve, each foil set comprises a first foil and a second foil, the first fixing end of each first foil is fixed on one of the fixing positions and circumferentially extends from the fixing position to the position between the next two fixing positions, and the first free end of each first foil is lapped on the next first foil; each second foil is arranged between the bearing sleeve and the last first foil, the second fixed end of the second foil and the corresponding first fixed end are fixed on the same fixed position, the second foil circumferentially extends from the fixed position to a position between the fixed position and the last fixed position along the direction opposite to the direction of the first foil, and the second free end of the second foil is supported below the last first foil. According to the dynamic pressure gas bearing, through the arrangement of the second foil, the supporting point of the first foil is increased, and the damping characteristic, the running stability and the shock resistance of the dynamic pressure gas bearing are improved.
Description
Technical Field
The invention belongs to the technical field of gas bearings, and particularly relates to a dynamic pressure gas bearing.
Background
Gas bearings can be divided into two main categories, hydrostatic gas bearings and hydrodynamic gas bearings. Compared with a static pressure gas bearing, the dynamic pressure gas bearing does not need to additionally provide a high-pressure gas source, has the advantages of simple structure, small volume and the like, and is widely applied to the fields of micro gas turbines, micro turbojet engines and the like.
A wedge-shaped gap or other special form of gap exists between the dynamic pressure gas bearing and the rotor, and when the rotor rotates, gas dynamic pressure is generated in the gap. Dynamic pressure gas bearings include bearing sleeves that typically have a resilient support structure, such as a foil structure, therein to improve the stability of the rotor system and when subjected to an unstable load, the foil structure undergoes relative sliding due to deformation to create coulomb friction. The foil structure can bear loads in different directions perpendicular to the axis, but the bending rigidity of the foil structure is smaller, so that the bearing rigidity of the foil structure is smaller, and the stability and the service life of the whole dynamic pressure gas bearing are affected.
Disclosure of Invention
The invention aims to provide a dynamic pressure gas bearing so as to solve the technical problem that the bearing rigidity of a foil structure in the dynamic pressure gas bearing is insufficient in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: the dynamic pressure gas bearing comprises a bearing sleeve and a plurality of groups of foil groups distributed on the inner side of the bearing sleeve; a plurality of fixed bits are circumferentially distributed on the inner wall of the bearing sleeve, and the number of the fixed bits is equal to that of the foil groups; each set of foils comprises a first foil having a first fixed end and a first free end and a second foil having a second fixed end and a second free end; the first fixed end of each first foil is fixed on one of the fixed positions, extends from the fixed position to the position between the two next fixed positions in the circumferential direction, and the first free end of each first foil is overlapped on the next first foil; each second foil is arranged between the bearing sleeve and the last first foil, the second fixed end of the second foil and the corresponding first fixed end are fixed on the same fixed position, the second foil circumferentially extends from the fixed position to the position between the fixed position and the last fixed position along the direction opposite to the direction of the first foil, and the second free end of the second foil is supported under the last first foil.
Optionally, a first supporting point is abutted between the first foil and the last first foil, a second supporting point is abutted between the first foil and the next second foil, and a third supporting point is abutted between the first foil and the next first foil;
wherein the second support point is located between the first support point and the third support point;
or the first support point is located between the second support point and the third support point.
Optionally, a first circumferential distance is arranged between two adjacent fixing positions, and the first foil covers 1.35-1.75 times of the first circumferential distance; the second foil covers a first circumferential distance of 0.35 to 0.75 times.
Optionally, the first foil covers a first circumferential distance of 1.5 times; the second foil covers a first circumferential distance of 0.5 times.
Optionally, the first foil is in a circular arc sheet structure, and the inner diameter and the outer diameter of the first foil are both larger than the inner diameter of the bearing sleeve.
Optionally, the first foil is bent in the middle and is formed with an inner step and an outer step, the height of the inner step and the height of the outer step are both adapted to the thickness of the first foil, the first free end of the last first foil is stopped at the outer step, and the second free end of the next second foil is stopped at the inner step.
Optionally, the clamping groove is set up in the fixed position, first stiff end extends has first kink, second stiff end extends has the second kink, first kink with the second kink is blocked respectively and is located in the clamping groove to through the chock chucking.
Optionally, the first fixing end is fixed on the inner wall of the bearing sleeve in a manner of hinging, screw connection, rivet riveting, welding or pasting;
the second fixed end is fixed on the inner wall of the bearing sleeve in a hinged, screw connection, rivet riveting, welding or sticking mode.
Optionally, the width of the bearing sleeve along the axial direction, the width of the first foil along the axial direction and the width of the second foil along the axial direction are equal.
Optionally, a wear-resistant material layer is laid on the surface of one side of the first foil, which is away from the bearing sleeve.
The dynamic pressure gas bearing provided by the invention has the beneficial effects that: compared with the prior art, the dynamic pressure gas bearing comprises the bearing sleeve and a plurality of groups of foil groups, wherein each group of foil groups comprises the first foil and the second foil, the first foil and the second foil circumferentially extend along opposite directions, the free end of each first foil is lapped on the next first foil, and the free end of each second foil is supported under the previous first foil, so that each first foil can be supported through the next first foil and also can be supported through the next second foil, the supporting point of the first foil is increased, the bending rigidity of the first foil is increased, the supporting rigidity of the whole dynamic pressure gas bearing is further improved, the damping performance of the dynamic pressure gas bearing is improved, and the motion stability and the service life of the dynamic pressure gas bearing are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a dynamic pressure gas bearing according to an embodiment of the present invention;
FIG. 2 is an exploded view of a dynamic pressure gas bearing according to an embodiment of the present invention;
FIG. 3 is an axial schematic view of a dynamic pressure gas bearing according to an embodiment of the present invention;
FIG. 4 is an axial schematic view of the hydrodynamic gas bearing of FIG. 3 with the second foils removed;
FIG. 5 is a schematic view of the first foil in FIG. 3;
FIG. 6 is a schematic view of the structure of the second foil in FIG. 3;
FIG. 7 is a schematic view of the bearing housing of FIG. 3;
FIG. 8 is an axial schematic view of a dynamic pressure gas bearing according to another embodiment of the present invention;
FIG. 9 is a schematic diagram illustrating the mounting of the first foil and the second foil in FIG. 8;
Fig. 10 is a schematic view of the structure of the first foil in fig. 8.
Wherein, each reference sign in the figure:
200-rotor; 10-a bearing sleeve; 20-foil sets; 30-chocks; 11-fixing the position; 12-clamping grooves; 21-a first foil; 22-a second foil; 211-a first fixed end; 212-a first free end; 213-inner steps; 214-an outer step; 215-a first bend; 221-a second fixed end; 222-a second fixed end; 223-second bend; p-first gap; o1-a first bearing point; o2-a second bearing point; o3-third bearing point; l1-first circumferential distance.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The dynamic pressure gas bearing provided by the present invention will now be described.
Referring to fig. 1, the dynamic pressure gas bearing includes a bearing housing 10 and eight foil sets 20. The bearing sleeve 10 is cylindrical, and eight groups of foil groups 20 are uniformly distributed on the inner side of the bearing sleeve 10 along the circumferential direction and are propped between the rotor 200 and the bearing sleeve 10 during operation so as to improve the running stability between the rotor 200 and the bearing sleeve 10. It will be appreciated that in the embodiments of the present invention, four, six, nine and more sets of foils 20 may be provided on the inner side of the bearing housing 10, depending on the specific radial dimensions of the bearing housing 10 and the actual supporting strength of the sets of foils 20, which are not limited solely herein.
Eight fixing positions 11 are circumferentially distributed on the inner wall of the bearing sleeve 10, and the number of the fixing positions 11 is equal to that of the foil groups 20, namely, the number of the fixing positions 11 is changed along with the change of the number of the foil groups 20.
Referring to fig. 2 and 3, each of the foil sets 20 includes a first foil 21 and a second foil 22, the first foil 21 and the second foil 22 are both cantilever-shaped, the first foil 21 has a first fixed end 211 and a first free end 212, and the second foil 22 has a second fixed end 221 and a second free end 222.
Referring to fig. 4, which is a schematic installation diagram of the bearing housing 10 and each first foil 21, the first fixed end 211 of each first foil 21 is fixed on one of the fixed positions 11, and extends from the fixed position 11 to the space between the next two fixed positions 11 in the counterclockwise direction, and the first free end 212 thereof overlaps the next first foil 21. As can be seen from fig. 4, a first gap P is formed between each first foil 21 and the bearing housing 10, and the first gap P is located below the region of the converging wedge-shaped gap between the first foil 21 and the rotor 200, so that the first foil 21 in this region has weak supporting strength.
Referring to fig. 3, which is a schematic view of the installation of the bearing housing 10, the first foils 21 and the second foils 22, the present application supports the first foils 21 by disposing one second foil 22 in each first gap P. Specifically, each second foil 22 is disposed between the bearing housing 10 and the previous first foil 21, the second fixed end 221 of the second foil 22 and the first fixed end 211 of the corresponding first foil 21 are fixed on the same fixed position 11, and circumferentially extend from the fixed position 11 in the opposite direction (i.e. clockwise) to the direction opposite to the first foil 21 between the fixed position 11 and the previous fixed position 11, and the second free end 222 thereof is supported under the previous first foil 21. It can be seen from the above that, for each first foil 21, the first free end 212 thereof can overlap the next first foil 21, and the suspended portion of the first foil 21 can be supported by the second foil 22. It will be appreciated that in other embodiments of the application, the first foil 21 may extend circumferentially clockwise and the second foil 22 may extend circumferentially counterclockwise in the same set of foils 20, without limitation.
In the actual working process of the dynamic pressure gas bearing, a plurality of wedge-shaped gaps formed between the rotor 200 and the first foil 21 form gas film pressure, and the gas film gaps of the wedge-shaped gaps are different according to the size and the direction of the load. Due to the symmetry of the structure, the dynamic pressure gas bearing having the plurality of first foils 21 can withstand loads in all directions perpendicular to the axis. When the bearing is loaded, the first foil 21 is deformed by the pressure of the air film, and since the conventional dynamic pressure air bearing has only one layer of the first foil 21, the first gap P between the first foil 21 and the bearing housing 10 is not supported, so that the supporting rigidity of the first foil 21 is small, resulting in a small bearing capacity. In the dynamic pressure gas bearing of the present invention, the second foil 22 is located below the region of the converging wedge-shaped gap between the first foil 21 and the rotor 200, and the deformation amount of the pressed region of the first foil 21 can be reduced, thereby increasing the supporting rigidity.
The dynamic pressure gas bearing provided by the invention comprises a bearing sleeve 10 and a plurality of groups of foil groups 20, wherein each group of foil groups 20 comprises a first foil 21 and a second foil 22, the first foil 21 and the second foil 22 circumferentially extend along opposite directions, the free end 211 of each first foil 21is lapped on the next first foil 21, and the free end 221 of each second foil 22is supported under the previous first foil 21, so that each first foil 21 can be supported by the next first foil 21 and also can be supported by the next second foil 22, the supporting points of the first foils 21 are increased, the mutual contact points among the foils are increased, the damping characteristic of the dynamic pressure gas bearing is improved, and the stability and the shock resistance of the dynamic pressure gas bearing in the operation process are improved.
In this embodiment, referring to fig. 3, a first supporting point O1 is abutted between a first foil 21 and a previous first foil 21, a second supporting point O2 is abutted between the first foil 21 and a next second foil 22, and a third supporting point O3 is abutted between the first foil 21 and the next first foil 21; the second supporting point O2 is located between the first supporting point O1 and the third supporting point O3, that is, the position where the first foil 21 supports the previous first foil 21is close to the first fixed end 211, so that the supporting strength and the supporting stability of the first foil 21 to the previous first foil 21 are enhanced, and the supporting position of the second foil 22 to the first foil 21is close to the approximately middle position of the first foil 21, that is, the position where the supporting strength of the first foil 21is the weakest, in other words, the second foil 22 is fully utilized, so that the supporting effect of the second foil 22 is optimized. It will be appreciated that in other embodiments of the invention, the first support point O1 may also be located between the second support point O2 and the third support point O3, depending on the specific circumferential length of the first foil 21, which is not limited only herein.
The longer the circumferential length of the first foil 21, the weaker the supporting strength thereof, and the shorter the circumferential length of the first foil 21, the fewer the overlapping portion thereof with the adjacent first foil 21, the weaker the supporting strength thereof against the adjacent first foil 21, and thus the circumferential length of the first foil 21 is particularly important. In this embodiment, referring to fig. 3, a first circumferential distance L1 is between two adjacent fixing locations 11, so that the first foils 21 cover 1.5 times of the first circumferential distance L1, that is, the first foils 21 extend from one fixing location 11 to the next fixing location 11 and exceed the first circumferential distance L1 0.5 times of the next fixing location, so that not only can two adjacent first foils 21 overlap 0.5 times of the first circumferential distance L1, but also the circumferential length of the first foils 21 is moderate, and the supporting strength of the first foils can be guaranteed. It will be appreciated that in other embodiments of the present application, the first foil 21 may cover the first circumferential distance L1 times, 1.4 times, 1.6 times, and 1.75 times, so long as the first foil 21 covers the first circumferential distance L1 in the range of 1.35 to 1.75, which can ensure the supporting strength of the first foil 21, and is not limited herein.
The longer the circumferential length of the second foil 22, the weaker the self-supporting strength thereof, and the weaker the supporting strength of the first foil 21, and the shorter the circumferential length of the second foil 22, the supporting position of the second foil 22 is not the weakest supporting position of the first foil 21, i.e. the second foil 22 does not exert the proper supporting effect, and thus the circumferential length of the second foil 22 is particularly important. In the present embodiment, the second foil 22 covers the first circumferential distance L1 of 0.5 times, that is, the second foil 22 extends from the fixing location 11 reversely by the first circumferential distance L1 of 0.5 times, so that the second foil 22 is just supported to the weakest position of the first foil 21, and the supporting strength of the second foil 22 is higher, and the supporting effect on the first foil 21 is better. It will be appreciated that in other embodiments of the present invention, the second foil 22 may cover the first circumferential distance L1 0.35 times, 0.4 times, 0.6 times and 0.75 times, so long as the second foil 22 covers the first circumferential distance L1 in the range of 0.35 to 0.75, which can ensure the supporting strength of the first foil 21, and is not limited only herein.
Referring to fig. 6, the second foil 22 has a circular arc sheet structure, and the inner diameter of the second foil may be larger than, smaller than or equal to the inner diameter of the bearing housing 10.
In this embodiment, referring to fig. 4 and 5, the first foil 21 has an arc-shaped sheet structure, the first foil 21 has a first cylindrical surface and a second cylindrical surface, the first cylindrical surface faces the inner wall of the bearing housing 10, the second cylindrical surface faces away from the inner wall of the bearing housing 10, and the diameters of the first cylindrical surface and the second cylindrical surface are both larger than the inner diameter of the bearing housing 10, so that when the first fixing end 211 is fixed on the fixing position 11, the first free end 212 can be tilted to support the rotor 200.
In another embodiment of the present invention, referring to fig. 8 to 10, the first foil 21 is bent in the middle and formed with an inner step 213 and an outer step 214, the height of the inner step 213 and the height of the outer step 214 are adapted to the thickness of the first foil 21, the first free end 212 of the first foil 21 stops against the outer step 214, and the second free end 222 of the next second foil 22 stops against the inner step 213, i.e. the first supporting point O1 and the second supporting point O2 are located at two sides of the step, respectively. Specifically, the first foil 21 includes two sections of arc sheet structures, the two sections of arc sheet structures are connected along a bus, the connection part is bent into a shape similar to a step, the overlapping position of the first free end 212 of the last first foil 21 and the first foil 21 is close to the position of the outer step 214 but cannot pass over the outer step 214, so that the transition of the contact surface of the first foil 21 and the rotor 200 at the overlapping position of the first foil 21 is smoother, and the middle part of the first foil 21 is subjected to bending treatment, so that the transition of the overlapping positions of the first foils 21 is smoother, the air film gap between the rotor 200 and the first foil 21 is distributed more uniformly, and the bearing capacity of the first foil 21 is improved to a certain extent.
In this embodiment, referring to fig. 3 and 7, eight clamping grooves 12 are distributed on the inner side wall of the bearing housing 10, the number of the clamping grooves 12 is equal to the number of the fixing positions 11, the clamping grooves 12 are formed at the fixing positions 11, the clamping grooves 12 are U-shaped and open towards the center of the bearing housing 10, and the clamping grooves 12 penetrate through the bearing housing 10 along the bearing. The first fixing end 211 extends to form a first bending portion 215, the first bending portion 215 extends towards the clamping groove 12, and the bending angle of the first bending portion 215 is slightly larger than 90 degrees. The second fixing end 221 extends to form a second bending portion 223, the second bending portion 223 extends towards the clamping groove 12, and the first bending portion 215 and the second bending portion 223 are respectively clamped in the clamping groove 12 and clamped by the plug 30, wherein the bending angle of the second bending portion 223 is slightly larger than 90 degrees. In this embodiment, the first bending portion 215 and the second bending portion 223 are plugged in the clamping groove 12 by the plug 30, so that the first foil 21 and the second foil 22 are mounted, and the structure is simple and the mounting is convenient.
Specifically, the clamping groove 12 is processed by adopting a linear cutting process, and the like, the width and the depth of the clamping groove 12 are both 2-3 mm, the plug 30 is cuboid, during installation, the first bending part 215 and the second bending part 223 are respectively abutted against two opposite inner walls of the clamping groove 12 along the circumferential direction, and then the plug 30 is plugged between the first bending part 215 and the second bending part 223, so that the fixation of the first bending part 215 and the second bending part 223 is realized.
It will be appreciated that in other embodiments of the present invention, the first fixing end 211 may be fixed to the inner wall of the bearing housing 10 by means of hinging, screwing, riveting, welding or adhering. Likewise, the second fixing end 221 may be fixed to the inner wall of the bearing housing 10 by means of hinging, screw connection, rivet riveting, welding or adhesion, which is not limited herein.
In this embodiment, referring to fig. 1, the width of the bearing sleeve 10 in the axial direction, the width of the first foil 21 in the axial direction, and the width of the second foil 22 in the circumferential direction are all equal, so that the bearing strength of the first foil 21 and the second foil 22 can be ensured to be uniformly distributed in the axial direction, and the dynamic pressure gas bearing can be ensured to operate stably.
In this embodiment, a wear-resistant material layer is laid on the surface of one side of the first foil 21 facing away from the bearing sleeve 10, and by the arrangement of the wear-resistant material layer, the wear resistance of the first foil 21 to the rotor 200 is higher and the service life is longer in the rotation process of the rotor 200.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (8)
1. The dynamic pressure gas bearing is characterized by comprising a bearing sleeve and a plurality of groups of foil groups distributed on the inner side of the bearing sleeve; a plurality of fixed bits are circumferentially distributed on the inner wall of the bearing sleeve, and the number of the fixed bits is equal to that of the foil groups; each set of foils comprises a first foil having a first fixed end and a first free end and a second foil having a second fixed end and a second free end; the first fixed end of each first foil is fixed on one of the fixed positions, extends from the fixed position to the position between the two next fixed positions in the circumferential direction, and the first free end of each first foil is overlapped on the next first foil; each second foil is arranged between the bearing sleeve and the last first foil, the second fixed end of the second foil and the corresponding first fixed end are fixed on the same fixed position, the second foil circumferentially extends from the fixed position to the position between the fixed position and the last fixed position along the direction opposite to the first foil, and the second free end of the second foil is supported under the last first foil;
a first supporting point is abutted between the first foil and the last first foil, a second supporting point is abutted between the first foil and the next second foil, and a third supporting point is abutted between the first foil and the next first foil;
wherein the second support point is located between the first support point and the third support point;
Or the first support point is located between the second support point and the third support point;
A first circumferential distance is arranged between two adjacent fixing positions, and the first foil covers 1.35-1.75 times of the first circumferential distance; the second foil covers a first circumferential distance of 0.35 to 0.75 times.
2. The hydrodynamic gas bearing of claim 1, wherein the first foil covers a first circumferential distance of 1.5 times; the second foil covers a first circumferential distance of 0.5 times.
3. The dynamic pressure gas bearing as claimed in claim 1 or 2, wherein said first foil has a circular arc sheet-like structure, and the inner diameter and the outer diameter of said first foil are both larger than the inner diameter of said bearing housing.
4. A hydrodynamic gas bearing according to claim 1 or 2, wherein the first foil is bent in the middle and is formed with an inner step and an outer step, the height of the inner step and the height of the outer step being adapted to the thickness of the first foil, the first free end of the last one of the first foils being stopped against the outer step and the second free end of the next one of the second foils being stopped against the inner step.
5. The dynamic pressure gas bearing as claimed in claim 1 or 2, wherein the fixing portion is provided with a clamping groove, the first fixing portion is extended with a first bending portion, the second fixing portion is extended with a second bending portion, and the first bending portion and the second bending portion are respectively clamped in the clamping groove and clamped by a plug.
6. The dynamic pressure gas bearing as claimed in claim 1 or 2, wherein said first fixed end is fixed to said inner wall of said bearing housing by means of hinging, screw connection, rivet riveting, welding or adhesion;
the second fixed end is fixed on the inner wall of the bearing sleeve in a hinged, screw connection, rivet riveting, welding or sticking mode.
7. The dynamic pressure gas bearing as claimed in claim 1 or 2, wherein the width of said bearing housing in the axial direction, the width of said first foil in the axial direction and the width of said second foil in the axial direction are all equal.
8. Dynamic pressure gas bearing according to claim 1 or 2, characterized in that a wear-resistant material layer is laid on the surface of the side of the first foil facing away from the bearing housing.
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| CN201911363114.1A CN113048145B (en) | 2019-12-26 | 2019-12-26 | Dynamic pressure gas bearing |
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| CN113048145B true CN113048145B (en) | 2024-08-13 |
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| US9151322B2 (en) * | 2009-10-06 | 2015-10-06 | Mohawk Innovative Technology, Inc. | Foil journal bearing applicable to high speed machining center |
| WO2011044110A2 (en) * | 2009-10-06 | 2011-04-14 | Mohawk Innovative Technology, Inc. | High speed machining center |
| JP2013053645A (en) * | 2011-09-01 | 2013-03-21 | Ntn Corp | Thrust foil bearing |
| JP5840423B2 (en) * | 2011-08-29 | 2016-01-06 | Ntn株式会社 | Foil bearing |
| CN110594285B (en) * | 2019-08-30 | 2021-09-21 | 广州市昊志机电股份有限公司 | Gas dynamic pressure bearing and high-speed motor |
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