CN210565782U - Squeeze film damping bearing - Google Patents
Squeeze film damping bearing Download PDFInfo
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- CN210565782U CN210565782U CN201921680315.XU CN201921680315U CN210565782U CN 210565782 U CN210565782 U CN 210565782U CN 201921680315 U CN201921680315 U CN 201921680315U CN 210565782 U CN210565782 U CN 210565782U
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- damping
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- 238000013016 damping Methods 0.000 title claims abstract description 32
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000005461 lubrication Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000004540 pour-on Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 70
- 230000009467 reduction Effects 0.000 description 10
- 239000010687 lubricating oil Substances 0.000 description 8
- 229910000897 Babbitt (metal) Inorganic materials 0.000 description 4
- 230000036316 preload Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Sliding-Contact Bearings (AREA)
- Support Of The Bearing (AREA)
Abstract
The utility model discloses an squeeze film damping bearing, including bearing upper housing and bearing lower housing, the bearing upper housing is provided with a plurality of pads with equal angle with the inboard of bearing lower housing, every the arc section that the pad accounts for is 72, and the inboard of the arc section between the pads is installed the stopper, stopper and bearing upper housing and bearing lower housing fixed connection, there is radial clearance between pad and the stopper, set up four inlet ports one in 0 °, 90 °, 180 ° and 270 ° of bearing upper housing and bearing lower housing; the damping bearing can bear larger rotor load, and the application range of the damping bearing is widened; the damping coefficient of the bearing is increased through the squeeze oil film, the vibration displacement of a shafting is reduced, and the stability of a rotor system is improved; the bearing has lower cross rigidity coupling, and can reduce the influence of the nonlinear characteristic of oil film force on rotor dynamics; the bearing can operate in a region where the resonance frequency cannot be avoided.
Description
Technical Field
The utility model belongs to the technical field of the bearing, concretely relates to squeeze film damping bearing.
Background
In the vibration reduction technology of the supporting bearing structure, the vibration reduction effect is usually obtained by adopting an elastic supporting structural form, and the supporting rigidity of a rotor system can be reduced by adopting the elastic supporting, namely the critical rotating speed is reduced along with the reduction of the supporting rigidity, so that the supporting bearing structure has a certain supporting vibration reduction effect; the vibration of the elastic support is larger relative to the vibration of the rotor, so in order to reduce the vibration of the elastic support, additional damping is introduced into the system to reduce the vibration of the rotor system and the elastic support, and a damper is added at the elastic support in the elastic support sliding bearing in a commonly adopted method; in the fulcrum friction test on tilting pad bearing pads, it was found that as the load increases, the change in the axis locus caused by the pivot bearing pads is a linear path with respect to the equilibrium position, whereas in the case of ball-and-socket bearing pads, the axis locus is a curved path, and similarly in the dynamic coefficient test, the cross-coupling dynamic coefficients of the pivot bearing pads are respectively equal to zero, while the coefficients of the ball-and-socket bearing pads are not equal to zero, and are significant.
The tilting pad bearing of traditional machinery fulcrum shakes or slides through the axle bush, realizes bearing rigidity and the low cross coupling of damping coefficient, has the wearing and tearing of machinery fulcrum and high contact pressure scheduling problem simultaneously, takes place to block or other factors and leads to the unable beat of tile piece if the fulcrum, will produce and influence the phenomenon such as unit steady operation or lubricating oil volume increase suddenly, and the in-service use is comparatively inconvenient, has certain improvement space.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a squeeze film damping bearing to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an extruded oil film damping bearing comprises an upper bearing shell and a lower bearing shell, wherein a plurality of pads are arranged on the inner sides of the upper bearing shell and the lower bearing shell at equal angles, the arc section occupied by each pad is 72 degrees, a limiter is arranged on the inner side of the arc section between the pads, the limiter is fixedly connected with the upper bearing shell and the lower bearing shell, a radial gap exists between each pad and the limiter, four oil inlet holes I are arranged in grooves at 0 degree, 90 degree, 180 degree and 270 degree positions of the upper bearing shell and the lower bearing shell, a complete oil inlet hole I is formed by half holes of the upper bearing shell and the lower bearing shell at 0 degree and 180 degree, and tile temperature measuring points are arranged on the surfaces of the pads.
Preferably, the diameter of the inner wall of each tile is larger than the diameter of the shaft to form clearance lubrication, babbitt metal is poured on the surface of the inner wall of each tile, an extrusion oil hole is formed in the center of the surface of each tile, an extrusion vibration reduction film is formed between the center of the outer surface of each tile and the inner walls of the upper bearing shell and the lower bearing shell, and the extrusion vibration reduction films are communicated with the extrusion oil holes.
Preferably, oil inlet three is symmetrically formed in the upper bearing shell and the lower bearing shell, two symmetrically-formed lifting screw holes are formed in two sides of the top of the upper bearing shell, 5 oil inlet four are respectively formed in oil storage grooves in two sides of the pad along the radial direction, the oil inlet four is communicated with the oil inlet three through an annular cavity, and an oil storage groove is formed in one side of the oil inlet four.
Preferably, the bearing upper housing and the outer sleeve of the limiter are provided with a bearing seat, an anti-rotation pin is installed at the middle position of the top end of the bearing seat, and the upper housing and the lower bearing housing penetrate through a connecting bolt at the middle section.
Preferably, the side edge surfaces of the upper bearing shell and the lower bearing shell are provided with annular cavities, and the side edges of the annular cavities are provided with oil slingers.
Preferably, oil inlet grooves are formed in the centers of two ends of the inner sides of the upper bearing shell and the lower bearing shell, and oil return grooves are symmetrically formed in two sides of each oil inlet groove.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the damping bearing can bear larger rotor load, and the application range of the damping bearing is widened;
2. the damping coefficient of the bearing is increased through the squeeze oil film, the vibration displacement of a shafting is reduced, and the stability of a rotor system is improved;
3. the bearing has lower cross rigidity coupling, and can reduce the influence of the nonlinear characteristic of oil film force on rotor dynamics; the bearing can run in a region which can not avoid the resonance frequency;
drawings
Fig. 1 is a cross-sectional view of the present invention;
fig. 2 is a side view of the cross-sectional view of the present invention.
In the figure: 1. anti-rotation pins; 2. a bearing upper housing; 3. a stopper; 4. a tile; 5. a connecting bolt; 6. measuring a tile temperature; 7. a bearing lower housing; 8. babbitt metal; 9. an oil slinger; 10. hoisting the screw hole; 13. an oil inlet groove; 14. an oil inlet hole I; 15. an oil inlet hole II; 16. an annular cavity; 17. an oil inlet hole III; 18. an oil inlet hole IV; 19. an oil storage tank; 20. gap lubrication; 21. extruding the oil hole; 22. extruding the vibration reduction membrane; 23. an oil return groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2, the present invention provides a technical solution: an extruded oil film damping bearing comprises an upper bearing shell 2 and a lower bearing shell 7, wherein a plurality of pads 4 are arranged on the inner sides of the upper bearing shell 2 and the lower bearing shell 7 at equal angles, the arc section occupied by each pad 4 is 72 degrees, a limiter 3 is arranged on the inner side of the arc section between the pads, the limiter 3 is fixedly connected with the upper bearing shell 2 and the lower bearing shell 7, a radial gap exists between each pad 4 and the limiter 3, four oil inlet holes I are arranged in grooves at 0 degree, 90 degree, 180 degree and 270 degree positions of the upper bearing shell 2 and the lower bearing shell 7, the upper and lower shell half holes at 0 degree and 180 degree form a complete oil inlet hole I14, and a pad temperature measuring point 6 is arranged on the surface of each pad 4.
In this embodiment, preferably, the diameter of the inner wall of the pad 4 is greater than the diameter of the shaft to form the gap lubrication 20, the babbitt metal 8 is poured on the surface of the inner wall of the pad 4, the babbitt metal is soft and wear-resistant, and can protect the journal of the rotor under extreme conditions, the center of the surface of each pad 4 is provided with an extrusion oil hole 21, an extrusion vibration reduction film 22 is formed between the center of the outer surface of the pad 4 and the inner walls of the upper bearing shell 2 and the lower bearing shell 7, and the extrusion vibration reduction film 22 is communicated with the extrusion oil hole 21.
In this embodiment, preferably, oil inlets three 17 are symmetrically formed in the bearing upper shell 2 and the bearing lower shell 7, two symmetrically-shaped hoisting screw holes 10 are formed in two sides of the top of the bearing upper shell 2, 5 oil inlets four 18 are radially formed in oil storage grooves in two sides of the pad 4 respectively, the oil inlets four 18 are communicated with the oil inlets three 17 through an annular cavity 16, and an oil storage groove 19 is formed in one side of the oil inlets four 18.
In the embodiment, preferably, the bearing seat is sleeved outside the upper bearing shell 2 and the limiter 3, the anti-rotation pin 1 is installed at the middle position of the top end of the bearing seat, the connecting bolt 5 penetrates through the middle split part of the upper bearing shell 2 and the lower bearing shell 7, through the design of the utility model, a larger rotor load can be borne, the application range of the damping bearing is widened, the damping coefficient of the bearing is increased through the extrusion oil film, the vibration displacement of a shafting is reduced, the stability of a rotor system is improved, the bearing has lower cross rigidity coupling, and the influence of the nonlinear characteristic of the oil film force on the rotor dynamics can be reduced; the bearing can operate in a region where the resonance frequency cannot be avoided.
In this embodiment, preferably, annular cavities 16 are formed on the side edge surfaces of the upper bearing housing 2 and the lower bearing housing 7, and oil slingers 9 are arranged on the side edges of the annular cavities 16.
In this embodiment, preferably, oil inlet grooves 13 are formed in centers of two inner ends of the upper bearing housing 2 and the lower bearing housing 7, and oil return grooves 23 are symmetrically formed in two sides of each oil inlet groove 13.
Example of the implementation
A certain compressor originally adopts a common tilting pad bearing, when the debugging rising rotating speed is close to the rated rotating speed, sudden shock excitation is carried out, the amplitude of the shaft end reaches 75 micrometers, chain parking is caused, the bearing is replaced by a damping bearing, the damping bearing greatly improves the logarithmic attenuation rate of the system by comparing the logarithmic attenuation rate and the amplification coefficient, the stability of a rotor is improved, and the amplitude of a unit is reduced and kept in a reasonable range;
TABLE 1 tilting pad bearing and damping bearing influence on rotor stability
TABLE 2 vibration amplitude corresponding to working condition of unit before and after bearing change
The utility model discloses a theory of operation and use flow: when the utility model is used, the outside of the bearing box body is firstly connected with the high-pressure oil pump, the high-pressure oil firstly enters the annular oil inlet groove 13 of the bearing, the bearing shell corresponding to the groove is respectively provided with 4 oil inlet holes I14 which are arranged at intervals at 90 degrees, the 4 oil inlet holes I14 are connected with the oil inlet hole II 15, the lubricating oil is guided into the annular cavity 16 and then enters the oil inlet hole III 17, the lubricating oil synchronously enters the oil inlet holes IV 18 corresponding to the tile block 4 and the oil storage groove 19, the lubricating oil is brought into the gap for lubrication along with the rotation of the shaft, partial lubricating oil is extruded from the extrusion oil hole 21 to the tile back at the middle position of the tile body 4, the tile back is provided with a cavity formed by the extrusion vibration reduction diaphragm 22, a certain oil storage space is provided through the formed cavity, when a rotor is pressed to a tile block 4 by certain excitation, the oil film distribution at the tile block 4 is changed, more high-pressure oil films are extruded to the tile back, the dissipated vibration potential energy is not transmitted to the outside of the bearing upper shell 2 and the bearing lower shell 7, the extruded boundary lubricating oil is discharged from the end part oil return storage tank 19, the bearing converts the vibration of the rotor into the pressure energy of the lubricating oil and dissipates, therefore, the oil temperature in the bearing is slightly higher than that of the conventional tilting pad bearing, and the amount of the flowing lubricating oil is 1.2 times that of the conventional tilting pad bearing; the bearing capacity is high, the bearing is suitable for large and medium-sized rotating machinery equipment, a lubricating gap is usually Cb ═ (1-1.5%) Rb, Rb is the shaft diameter, a squeeze oil film gap is 0.5 Cb-1.5 Cb, a convergent region and an expanded region are formed on the back surface of a bush due to the influence of factors such as oil film squeezing, small hole throttling and the like, the expanded region is reduced under the condition that the oil inlet pressure is high enough, the oil-gas separation phenomenon is reduced, according to the short bearing approximation theory, when a damping bearing is in steady-state synchronous precession, the oil film rigidity and the oil film damping are in inverse proportion to the third power of the gap, when the squeeze oil film gap is small, the oil film damping is increased, when the oil supply pressure is sufficient, the bearing rigidity is kept constant, the damping is increased fast, the unstable phenomenon of oil film nonlinearity can be eliminated when a rotor passes through a critical rotating speed, a certain preload is arranged in a bearing bush, and the preload coefficient m is usually 0, m is 1-Cb/Cp, wherein Cb is the difference between the radius of the bearing and the radius of the shaft, Cp is the difference between the radius of the tile surface and the radius of the shaft, the pre-load reflects the convergence degree of the wedge-shaped space in the gap, the larger the value of m is, the more easily the working medium enters the wedge-shaped convergence space, the oil film force of the wedge-shaped space is increased, the bearing capacity is naturally increased, but more lubricating working medium mass needs to flow.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a squeeze film damping bearing, includes casing (2) and bearing lower housing (7) on the bearing, the inboard of casing (7) is equalled and is provided with a plurality of tiling (4) under bearing upper housing (2) and the bearing, its characterized in that: the arc section occupied by each tile block (4) is 72 degrees, a limiter (3) is installed on the inner side of the arc section between tiles, the limiter (3) is fixedly connected with an upper bearing shell (2) and a lower bearing shell (7), a radial gap exists between each tile block (4) and the limiter (3), four oil inlet holes I are formed in grooves at 0 degree, 90 degree, 180 degree and 270 degree positions of the upper bearing shell (2) and the lower bearing shell (7), the upper shell half hole and the lower shell half hole at 0 degree and 180 degree form a complete oil inlet hole I (14), and tile temperature measuring points (6) are arranged on the surface of each tile block (4).
2. A squeeze film damping bearing according to claim 1 wherein: the inner wall diameter of tile piece (4) is greater than the diameter of axle and forms clearance lubrication (20), babbit alloy (8) have been pour on the inner wall surface of tile piece (4), every extrusion oilhole (21) have all been seted up to the surface central point department of tile piece (4), be formed with extrusion damping membrane (22) between the outer surface center department of tile piece (4) and the inner wall of casing (2) and bearing lower casing (7) on the bearing, extrusion damping membrane (22) are the form that communicates with each other with extrusion oilhole (21).
3. A squeeze film damping bearing according to claim 1 wherein: oil inlet three (17) have been seted up to the symmetry on casing (2) and the bearing lower casing (7) on the bearing, casing (2) top both sides set up two and are lifting by crane screw (10) of symmetry form on the bearing, radially offer 5 oil inlet four (18) respectively in the oil storage tank of tile block (4) both sides, oil inlet four (18) and oil inlet three (17) pass through annular chamber (16) intercommunication, oil storage tank (19) have been seted up to one side of oil inlet four (18).
4. A squeeze film damping bearing according to claim 1 wherein: the bearing is provided with a bearing seat sleeved with the outer part of the bearing upper shell (2) and the limiting stopper (3), an anti-rotation pin (1) is installed at the middle position of the top end of the bearing seat, and a connecting bolt (5) penetrates through the middle split surface of the upper shell (2) and the lower shell (7) of the bearing.
5. The squeeze film damping bearing of claim 4 wherein: annular cavities (16) are formed in the side edge surfaces of the upper bearing shell (2) and the lower bearing shell (7), and oil slingers (9) are arranged on the side edges of the annular cavities (16).
6. The squeeze film damping bearing of claim 5 wherein: oil inlet grooves (13) are formed in the centers of two ends of the inner sides of the upper bearing shell (2) and the lower bearing shell (7), and oil return grooves (23) are symmetrically formed in two sides of each oil inlet groove (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921680315.XU CN210565782U (en) | 2019-10-09 | 2019-10-09 | Squeeze film damping bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921680315.XU CN210565782U (en) | 2019-10-09 | 2019-10-09 | Squeeze film damping bearing |
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| CN210565782U true CN210565782U (en) | 2020-05-19 |
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| CN201921680315.XU Active CN210565782U (en) | 2019-10-09 | 2019-10-09 | Squeeze film damping bearing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628709A (en) * | 2020-06-12 | 2020-09-04 | 江苏中信博新能源科技股份有限公司 | Main beam and bearing assembly of photovoltaic tracking support and photovoltaic tracking support |
| CN113983069A (en) * | 2021-11-11 | 2022-01-28 | 中国船舶重工集团公司第七0三研究所 | High-speed heavy-load low-power-consumption dislocation molded line sliding support bearing |
| CN116090135A (en) * | 2023-03-09 | 2023-05-09 | 中国航发四川燃气涡轮研究院 | Damper-rotor system response analysis method |
-
2019
- 2019-10-09 CN CN201921680315.XU patent/CN210565782U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628709A (en) * | 2020-06-12 | 2020-09-04 | 江苏中信博新能源科技股份有限公司 | Main beam and bearing assembly of photovoltaic tracking support and photovoltaic tracking support |
| CN113983069A (en) * | 2021-11-11 | 2022-01-28 | 中国船舶重工集团公司第七0三研究所 | High-speed heavy-load low-power-consumption dislocation molded line sliding support bearing |
| CN113983069B (en) * | 2021-11-11 | 2024-04-09 | 中国船舶重工集团公司第七0三研究所 | High-speed heavy-load low-power consumption dislocation molded line sliding support bearing |
| CN116090135A (en) * | 2023-03-09 | 2023-05-09 | 中国航发四川燃气涡轮研究院 | Damper-rotor system response analysis method |
| CN116090135B (en) * | 2023-03-09 | 2023-06-30 | 中国航发四川燃气涡轮研究院 | Damper-rotor system response analysis method |
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Effective date of registration: 20210918 Address after: 210000 No.6 Zhihang Road, Lukou street, Jiangning District, Nanjing City, Jiangsu Province (Jiangning Development Zone) Patentee after: Jiangsu LUHANG Power Technology Co., Ltd Address before: No.2, Libin Road, Songshanhu science and Technology Industrial Park, Dongguan, Guangdong 523000 Patentee before: Kang Lei |