CN114294327A - Closed squeeze film damper with symmetrical structure and porous tilting pad bearing using same - Google Patents
Closed squeeze film damper with symmetrical structure and porous tilting pad bearing using same Download PDFInfo
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- CN114294327A CN114294327A CN202111535015.4A CN202111535015A CN114294327A CN 114294327 A CN114294327 A CN 114294327A CN 202111535015 A CN202111535015 A CN 202111535015A CN 114294327 A CN114294327 A CN 114294327A
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- porous
- bearing
- plunger
- squeeze film
- damper
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- 238000013016 damping Methods 0.000 claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 11
- 239000007769 metal material Substances 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 claims 1
- 230000003116 impacting effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to a closed squeeze film damper with a symmetrical structure and a porous tilting pad bearing using the same. The damper comprises a damper shell, a plunger piston, a pressing plate, a gasket, a flat spring, a sealing gasket and a ball stud, wherein the plunger piston, the pressing plate, the gasket, the sealing gasket and the ball stud are arranged in the damper shell; a porous tilting pad bearing using the damper at least comprises four closed squeeze film dampers, the dampers are arranged between a pad assembly and a bearing shell of the porous tilting pad bearing, and a pad of the porous tilting pad bearing is connected with the damper through a ball stud. When the tile block vibrates, the vibration is transferred to the plunger through the ball stud, the plunger vibrates in the damper cavity to generate damping force, and the damping force generated by the squeeze film damper is reacted on the tile block, so that the damping capacity of the bearing is obviously improved. The porous tilting pad bearing is expected to be applied to oil-free turbomachinery with high power and high performance. During the use, the rotor of high-speed rotation transmits the vibration for the tile, further transmits the plunger that soaks in damping fluid for, and the plunger produces damping force at the vibration in-process, reduces the impact of dynamic force to the bearing to the energy that constantly dissipates, and then optimizes the vibration characteristic of rotor and tile, improves the dynamic characteristic of rotor.
Description
Technical Field
The invention relates to a closed squeeze film damper with a symmetrical structure and an improvement of a related structure.
The invention also relates to a porous tilting pad bearing utilizing the closed squeeze film damper and a using method thereof.
Background
For a rotor assembly in a common machine, due to the influence of manufacturing errors, installation errors or external loads in the running process, the rotor inevitably generates vibration in the rotating process, and the running stability and the service life of the machine are influenced. To minimize the above problems, dampers are usually provided on these rotor assemblies to improve the damping characteristics of the gas bearings and enhance the rotational stability of the rotor.
In order to meet the requirements of high rotating speed and high stability of modern turbomachinery, the application of squeeze film dampers in related equipment is increasingly wide. The open squeeze film damper needs a complex bearing lubrication system to ensure the continuous supply of damping fluid, so that the open squeeze film damper is difficult to integrate with a gas bearing, and the application prospect is greatly restricted. The closed squeeze film damper overcomes the defects, can be modularly integrated in a gas bearing structure, and is greatly helpful for improving the service performance of the gas bearing and widening the service field of the gas bearing. Compared with a round pad bearing, the tilting pad bearing has certain rotation and radial flexibility, so that the tilting pad bearing can better adapt to the radial and rotation movements of a rotor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a closed squeeze film damper with a symmetrical structure, which does not need a complex bearing lubrication system and can be applied to high-performance turbomachinery.
Another object of the present invention is to provide a porous tilting pad bearing using the above-described closed squeeze film damper having a symmetrical structure.
Another object of the present invention is to provide a method for using the porous tilting pad bearing.
The invention provides a closed squeeze film damper with a symmetrical structure, which comprises a shell and a cavity in the shell; a plunger disposed in the cavity; pressing a plate; a gap is formed between the plunger and the shell, and damping liquid is arranged in the gap; a cavity is arranged between the plunger and the pressure plate, and damping liquid is arranged in the cavity; a gasket; a cavity is formed between the pressing plate and the flat spring, and damping liquid is arranged in the cavity; a gasket; a ball stud.
The closed squeeze film damper adopting the structure can be regarded as the parallel connection of two structures so as to further increase the damping performance.
Furthermore, the shell is of a symmetrical structure and is divided by the shell, and the pressure plate, the gasket and the flat spring are symmetrically distributed on two sides. The subsequent structural improvement of structure can be on present basis, through the mode whole machine-shaping of 3D printing.
Furthermore, a gap is formed between the cylindrical protrusions on the left side and the right side of the plunger and the cavity in the center of the pressure plate, and damping liquid is arranged in the gap.
Further, the shell, the pressure plate and the flat spring are all made of metal materials.
Further, one end of the ball stud is spherical.
Further, wherein the fluid is a viscous fluid, including but not limited to a metallic fluid, an oil-based fluid, and an incompressible fluid.
The invention further provides a porous tiltable bush bearing using the closed squeeze film damper with the symmetrical structure, which comprises but is not limited to four closed squeeze film dampers; a bearing housing; the bearing bush supporting assembly comprises a centering spring and a bearing bush mounting shell; a porous tile; and a nut.
The closed squeeze oil film damper is arranged between a bearing bush supporting component and a bearing shell of the porous tilting pad bearing, vibration is transmitted to a porous pad block by a rotor rotating at a high speed and is further transmitted to the bearing bush supporting component, further the vibration is transmitted to a plunger through a ball stud, and a centering spring can provide restoring force to enable the plunger to reciprocate in damping fluid.
Further, the bearing shell mounting housing, the centering spring and the bearing housing are integrally formed, but may be connected by other connection technologies capable of implementing the above functions, such as 3D printing.
Furthermore, the bearing bush mounting shell is provided with an air supply hole, and a ball socket is arranged behind the bearing bush mounting shell and can be used as a fulcrum point when the bearing bush blocks are inclined; the front surface of the bearing bush mounting shell is a bonding surface, and an air supply groove is arranged in the bonding surface. The working gas enters the gas supply groove through the gas supply hole and then enters between the tile and the rotor shaft neck through the porous tile to form a pressure gas film to support the rotor.
Further, the cross section of the centering spring is S-shaped.
Further, wherein the porous tile material is graphite or other porous material, such as: porous ceramics, and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an exploded view of a closed squeeze film damper of the present invention having a symmetrical structure;
FIG. 2 is a schematic view of the working principle of the closed squeeze film damper with a symmetrical structure according to the present invention;
FIG. 3 is a schematic view showing a modified process of the closed squeeze film damper of the present invention having a symmetrical structure;
FIG. 4 is a front and polished view of the plunger of the closed squeeze film damper of the present invention having a symmetrical configuration;
FIG. 5 is a front and rear view of a platen of the closed squeeze film damper of the present invention having a symmetrical configuration;
FIG. 6 is a front view of the porous tilting pad bearing of the present invention;
FIG. 7 is a downward perspective view of a bearing shell mounting housing of the porous tilting pad bearing of the present invention;
FIG. 8 is a perspective view of a bearing shell mounting housing of the porous tilting pad bearing of the present invention shown in an upward orientation;
FIG. 9 is a perspective view of a porous pad of the present invention;
description of reference numerals: 1-closed squeeze film damper with symmetrical structure; 2-a shell; 3-a plunger; 4, pressing a plate; 5-a gasket; 6-flat spring; 7-a sealing gasket; 8-ball stud; 9-the gap between the plunger and the housing; 10-the gap between the plunger and the platen central bore; 11-the cavity between the plunger and the pressure plate; 12-a cavity between the pressure plate and the flat spring; 13-; 14-; 15-schematic view of the closed squeeze film damper with symmetric structure; 16-a bearing housing; 17-a nut; 18-centering spring; 19-a tile mounting housing; 20-porous tiles; 21-air supply hole; 22-a ball and socket; 23-an adhesive surface; 24-air supply groove.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, the present invention provides a closed squeeze film damper 1 having a symmetrical structure, including a housing 2, a cavity in the housing 2; a plunger 3 disposed in the cavity; a pressing plate 4; a gap 9 is arranged between the plunger 3 and the shell 2, and damping liquid is arranged in the gap; a cavity 11 is arranged between the plunger 3 and the pressure plate 4, and damping liquid is arranged in the cavity; a gasket 5; a cavity 12 is formed between the flat spring 6 and the pressing plate 4 and the flat spring 6, and damping liquid is arranged in the cavity; a gasket 7; a ball stud 8.
In an embodiment, the housing 2 may be made of a metal material and has a symmetrical structure. The shell 2 is connected with the pressure plate 4, the gasket 5, the flat plate spring 6 and the sealing gasket 7 through bolts, and are symmetrically distributed about the shell 2.
Specifically, the shell 2 is of a cuboid symmetrical structure, threaded holes are formed in the periphery of the shell, the shell is easy to manufacture, and a cavity is formed in the shell 2; the plunger 3 is connected with the flat spring 6 through a bolt; the pressure plate 4 is a middle convex thin plate, and the convex height determines the volume of the cavity 11 and the cavity 12 under the balanced condition; the washer 5 and the flat spring 6 are both provided with a geometry adapted to the mounting. After the plunger 3, the shell 2 and other parts are installed, the gap 9, the gap 10, the cavity 11 and the cavity 12 are directly formed, and an oil supply system is not needed to continuously supply oil to the plunger after sealing is finished; a gasket 5 is arranged between the pressure plate 4 and the shell 2 and between the pressure plate and the flat spring 6; holes matched with the shell 2 are formed in the periphery of the flat spring 6, and holes matched with the plunger 3 are formed in the middle of the flat spring; the sealing gasket 7, the flat spring 6, the gasket 5 and the pressure plate 4 are fixed on the shell 2 through bolts; one end of the ball stud 8 is spherical and the other end is mounted in the plunger 3. The fluid is a viscous fluid including, but not limited to, a metallic fluid, an oil-based fluid, an incompressible fluid.
As shown in fig. 6, the present invention provides a porous tilting pad bearing with a symmetric closed squeeze film damper 1, comprising at least four closed squeeze film dampers 1, a bearing housing 16; the bearing bush supporting assembly comprises a centering spring 18 and a bearing bush mounting shell 19; a porous pad 20; and a nut 17. One end of the closed squeeze film damper 1 is fixedly connected to the bearing shell 16, and the other end of the closed squeeze film damper is connected with the bearing bush mounting shell 19 through the ball stud 7.
In the present embodiment, the porous tilting pad bearing comprises the closed squeeze film damper 1 between the bearing housing 16 and the pad mounting housing 19; the rotor running at high speed transmits vibration to the porous pad 20, the bearing mounting shell 19 is further transmitted to the plunger 3 through the ball stud 8, the centering spring 18 can provide restoring force for the plunger 3, so that the plunger 3 reciprocates in damping liquid, the flat spring 6 deforms, the volumes of the cavity 11 and the cavity 12 are changed, fluid flows in the gap 9 and the gap 10, and therefore damping force reacting on the porous pad 20 is generated, impact of dynamic force on a bearing is reduced, and energy is dissipated continuously. Due to its "S" shaped cross-section, the centering spring 10 is axially immovable, but provides radial stiffness to the rotor assembly.
Specifically, the bearing shell mounting housing 19, the centering spring 18 and the bearing housing 16 may be integrally formed, but may be connected by any connecting means, such as welding, etc., that can achieve the above-mentioned functions.
As shown in fig. 6 to 8, the bushing mounting housing 19 has an air supply hole 21; a ball socket 22 is arranged at the back and can be used as a fulcrum when the tile inclines; the front surface of the bush mounting case 19 is a bonding surface 23, and an air supply groove 24 is provided in the bonding surface 23. Working gas enters the gas supply groove 24 through the gas supply hole and then enters between the tile and the rotor shaft neck through the porous tile 20 to form a pressure gas film to support the rotor to operate.
Preferably, the bearing housing 16, the centering spring 18 and the bearing bush mounting assembly are all made of metal materials; the porous tile 20 material is graphite or other porous material, such as: porous ceramics, and the like.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (14)
1. A closed squeeze film damper with a symmetrical structure comprises a shell (2), a cavity in the shell (2); a plunger (3) disposed in the cavity; a pressure plate (4); a gap (9) is arranged between the plunger (3) and the shell (2), and damping liquid is arranged in the gap; a cavity (11) is arranged between the plunger (3) and the pressure plate (4), and damping liquid is arranged in the cavity; a washer (5); a cavity (12) is formed between the pressing plate (4) and the flat spring (6), and damping liquid is arranged in the cavity; a gasket (7); a ball stud (8).
2. The closed squeeze film damper with the symmetrical structure according to claim 1, wherein the housing (2) is of a symmetrical structure, the pressure plate (4), the gasket (5), the flat spring (6) and the sealing gasket (7) are symmetrically distributed on two sides by taking the housing (2) as a boundary.
3. The closed squeeze film damper of a symmetric structure according to claim 1, wherein the plate spring (6) and the plunger (3) are connected by a bolt.
4. A closed squeeze film damper of symmetrical construction according to claim 1 wherein the operating diagram (15) of the damper is understood to be the parallel connection of the structure (13) and the structure (14) increasing the damping force.
5. The closed squeeze film damper with a symmetrical structure according to claim 1, wherein a gap (10) is formed between the cylindrical protrusions on the left and right sides of the plunger (3) and the cavity in the center of the pressure plate (4), and damping fluid is filled in the gap.
6. The closed squeeze film damper with symmetrical structure as claimed in claim 1, wherein the housing (2), the pressure plate (4) and the plate spring (6) are made of metal material.
7. The closed squeeze film damper with symmetric structure according to claim 1, wherein one end of the ball stud (8) is spherical.
8. The closed squeeze film damper of claim 1 wherein said damping fluid is a viscous fluid including but not limited to a metal fluid, an oil based fluid, an incompressible fluid.
9. A porous tilting pad bearing using a closed squeeze film damper with a symmetrical structure according to any one of claims 1 to 8, wherein: comprises at least four closed squeeze film dampers (1) with a symmetrical structure; a bearing housing (16); a nut (17); the bearing bush supporting assembly comprises a centering spring (18) and a bearing bush mounting shell (19); a porous pad (20).
10. A porous tilting pad bearing according to claim 7 wherein the pad mounting housing (19), centering spring (18) and bearing housing (16) are integrally formed, although they may be connected by other connecting techniques that achieve the described functionality, such as 3D printing.
11. A porous tilting pad bearing according to claim 7 wherein the rotor rotating at high speed transmits vibrations to the porous pad (20), the pad mounting housing (19) and further to the plunger (3) via the ball stud (8), the centering spring (19) providing a restoring force causing the plunger (3) to reciprocate in the damping fluid, the plate spring (6) moving with the plunger (3), the volume of the cavity (11) and the cavity (12) changing, the damping fluid moving in the gap (9) and the gap (10), during which a damping force is generated to react against the porous pad (20), reducing the dynamic forces impacting the bearing and dissipating energy continuously.
12. A porous tilting pad bearing according to claim 7 wherein the pad mounting housing (19) has an air supply hole (21) and a socket (22) on the back side to act as a fulcrum for tilting the pad; the front surface of the bearing bush mounting shell (19) is a bonding surface (23) which is provided with an air supply groove (24). Working gas enters the gas supply groove (24) through the gas supply hole (21), and then enters between the tile block (20) and the rotor shaft neck through the porous tile block (20) to form a pressure gas film to support the rotor.
13. The porous tilting pad bearing according to claim 7, wherein the centering spring is "S" shaped in cross section.
14. A porous tilting pad bearing according to claim 7 wherein the porous pad material is graphite or other porous material such as: porous ceramics, and the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535015.4A CN114294327A (en) | 2021-12-15 | 2021-12-15 | Closed squeeze film damper with symmetrical structure and porous tilting pad bearing using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111535015.4A CN114294327A (en) | 2021-12-15 | 2021-12-15 | Closed squeeze film damper with symmetrical structure and porous tilting pad bearing using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114294327A true CN114294327A (en) | 2022-04-08 |
Family
ID=80967785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111535015.4A Pending CN114294327A (en) | 2021-12-15 | 2021-12-15 | Closed squeeze film damper with symmetrical structure and porous tilting pad bearing using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114294327A (en) |
-
2021
- 2021-12-15 CN CN202111535015.4A patent/CN114294327A/en active Pending
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