CN111207176A - Comb tooth sealed squeeze film damper - Google Patents
Comb tooth sealed squeeze film damper Download PDFInfo
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- CN111207176A CN111207176A CN202010104246.9A CN202010104246A CN111207176A CN 111207176 A CN111207176 A CN 111207176A CN 202010104246 A CN202010104246 A CN 202010104246A CN 111207176 A CN111207176 A CN 111207176A
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- Prior art keywords
- damper
- ring
- groove
- labyrinth
- oil
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
- F16F15/0237—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means involving squeeze-film damping
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/12—Fluid damping
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2238/00—Type of springs or dampers
- F16F2238/04—Damper
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention discloses a labyrinth sealing type squeeze film damper which is sleeved outside a bearing and comprises an elastic support, wherein a bearing seat is arranged outside the bearing, the head part of the elastic support is a damper inner ring, the bearing seat is a damper outer ring, a rotor is sleeved in the bearing, the damper outer ring and the damper inner ring are in clearance fit, the clearance is an oil film clearance, an oil supply groove is arranged on the damper outer ring, an oil supply hole is formed in the oil supply groove and is arranged above the oil film clearance, a labyrinth or a groove is circumferentially arranged at the end part of the damper outer ring, a groove or a labyrinth is circumferentially arranged at the end part of the damper inner ring, a plastic material ring or an easily-ground material ring is arranged in the groove, and the damper labyrinth or the damper and the damper material. The damper is simple in structure and good in sealing effect, and linear change of oil film rigidity of the damper is achieved by controlling the specific thickness of the plastic material ring.
Description
The technical field is as follows:
the invention belongs to the technical field of damper design, and particularly relates to a comb tooth sealing type squeeze film damper.
Background art:
a rotor system consisting of a compressor and a turbine is the core of an aircraft engine and plays a crucial role in the performance of the engine. However, the rotor system has a complex structure and severe working conditions, and bears various loads, and under the working condition, the vibration problem is very prominent, and the performance of the engine is seriously influenced. Therefore, reducing rotor system vibration can greatly improve engine performance.
Squeeze film dampers have been used in aircraft engines for many years as a structure that effectively reduces rotor system vibration. The tight fit of an original bearing seat and a bearing outer ring is changed into clearance fit, the clearance is filled with lubricating oil to form an annular oil film, and vibration is reduced by extruding the oil film.
The basic working principle of the squeeze film damper is that the rotor squeezes the oil film due to the action of unbalanced force, the oil film generates reaction force to absorb part of vibration energy and reduce the vibration transmitted to the support, and therefore the vibration reduction effect is achieved.
The squeeze film damper is divided into an open type and a closed type according to whether an oil sealing device is arranged at the end part.
The open squeeze film damper has the advantages that the structural schematic diagram is shown in figure 1, the structure is simple, the operation is reliable, and the open squeeze film damper is widely applied to aeroengines. The disadvantages of open squeeze film dampers are also evident:
1) the end part of the damper is lack of seal, the pressure at the two ends is the same as the atmospheric pressure and is smaller than the middle extrusion pressure of the damper, the axial pressure gradient is reduced from the middle to the two ends, the lubrication oil extrusion at the two ends is insufficient, and the oil film damping is difficult to reach the design requirement;
2) the two ends of the open damper are directly exposed to the atmosphere, the pressure of one side of the oil film extruded by the shaft neck is increased, and the pressure of the other side of the oil film is reduced. When the pressure is reduced to be less than the atmospheric pressure, air is sucked due to pressure difference, the effective extrusion area of an oil film is reduced, the damping is reduced, and the vibration reduction effect is poor. This phenomenon is almost unavoidable and as the rotor amplitude and speed increase, the oil film damping drops significantly and even does not provide sufficient damping.
The closed squeeze film damper is structurally schematically shown in fig. 2, sealing elements such as piston rings and the like are additionally arranged at two ends, the lubricating oil leakage amount is reduced, the oil film damping is improved, the air suction is reduced, and larger damping can be obtained compared with an open damper. However, closed dampers also have disadvantages:
1) the use of the sealing element makes the structure of the closed damper more complicated than that of the open damper, the design and manufacture difficulty of the closed damper is large, and the working state is not as stable as that of the open damper;
2) the two ends of the closed damper are provided with a distance and then are grooved to assemble a sealing element, the oil film at the short distance cannot be fully extruded like the middle oil film, and the axial length of the oil film is not fully utilized.
In conclusion, the sealing structures are additionally arranged at the two ends of the damper, so that the problems of open dampers such as air suction and the like can be effectively reduced, the sealing structures and the damper are integrated and are arranged at the two ends, so that the stability of the damper can be improved, and a larger effective extrusion area can be obtained. Meanwhile, the sealing structure limits the eccentricity (dynamic eccentricity/oil film gap) of the damper within 0.4, and the oil film rigidity is approximately linearly changed, thereby being beneficial to the stability of the rotor.
The invention content is as follows:
the invention aims to overcome the defects of the open type squeeze film damper and the closed type squeeze film damper, and provides a squeeze film damper with a labyrinth seal structure added at two ends of the damper.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a labyrinth sealed squeeze film damper, the bearing outside is located to the cover, including elastic support, the bearing outside be equipped with the bearing frame, the elastic support head be the attenuator inner circle, the bearing frame be the attenuator outer lane, the bearing endotheca rotor is equipped with, attenuator outer lane and attenuator inner circle clearance set up, the clearance be the oil film clearance, the attenuator outer lane be equipped with the oil feeding groove, the oil feeding hole has been seted up to the oil feeding groove, the oil feeding hole locate oil film clearance top, wherein: the damper comb tooth sealing adopts one of the following modes:
the end part of the outer ring of the damper is circumferentially provided with a grid tooth, the end part of the inner ring of the damper is circumferentially provided with a groove, a plastic material ring or an easily-ground material ring is arranged in the groove, and the grid tooth at the end part of the outer ring of the damper is arranged corresponding to the material ring of the inner ring of the damper;
and (II) a groove is formed in the circumferential direction of the end part of the outer ring of the damper, comb teeth are formed in the circumferential direction of the end part of the inner ring of the damper, a plastic material ring or an easily-ground material ring is arranged in the groove, and the material ring at the end part of the outer ring of the damper and the comb teeth of the inner ring of the damper are arranged correspondingly.
The elastic supporting piece and the rotor are concentrically arranged through a bearing.
The lubricating oil is ISO VG2, and forms an oil film.
The depth of the groove formed in the outer ring or the inner ring of the damper corresponds to the thickness of the plastic material ring or the easily-ground material ring.
The bottom of the comb tooth is horizontal to the bottom of the oil film gap, and the height of the top of the comb tooth is slightly smaller than the oil film gap.
The longitudinal thickness of the plastic material ring or the easily-worn material ring is reasonably designed according to the maximum unbalanced force borne by the engine, and the oil film clearance is less than or equal to 0.4 time.
In the working process of the comb-tooth sealed type squeeze film damper, the rotor rotates at a high speed, the comb tooth extrudes a plastic material ring or an easily-ground material ring, when the comb-tooth sealed type squeeze film damper is a plastic material ring, the plastic material ring deforms, a tooth-shaped groove is formed in the surface of the plastic material ring, and then the comb-tooth sealed type squeeze film damper and the plastic material ring form a closer fit relation, so that the sealing effect is enhanced. When the ring is made of easily-ground material, after the ring is contacted with the grate and worn, a wear groove is left on the ring, so that the sealing capability is enhanced.
In the working process of the comb-tooth sealed squeeze film damper, the eccentricity ratio is less than or equal to 0.4 by controlling the thickness of a plastic material ring or an easily-ground material ring to be less than or equal to 0.4 time of an oil film gap, and the eccentricity ratio is equal to a dynamic eccentricity/oil film gap.
The invention has the advantages of stable working state and relatively simple design of the open type squeeze film damper integration, and the characteristics of less air suction and sufficient lubricating oil extrusion of the closed type damper.
The invention has the beneficial effects that:
(1) the structure is simple, the comb teeth and the plastic material ring (or the easily-ground material ring) are added on the basis of the open type squeeze film damper, the sealing structure of the closed type damper is not needed, and the assembly is convenient;
(2) the damping effect is good, and because the labyrinth seal structures are added at the two ends of the damper, air suction is reduced, and oil film damping is improved compared with an open damper;
(3) the oil film is fully extruded, the comb tooth structures at the two ends prevent lubricating oil from flowing out of the two ends, the leakage amount is reduced, and the oil film can be fully extruded;
(4) the axial length is fully utilized, and different from a closed damper, a part of the axial length of two ends needs to be abandoned due to the assembly reason, the grate and the material ring are positioned at the two ends, the axial length is utilized to the maximum extent, and the extrusion area is increased;
(5) the sealing is strengthened, the plastic material ring (or the easily-ground material ring) deforms (or is worn) due to the collision of the grid tooth, a small groove is formed, a complementary structure is formed with the grid tooth, and the sealing effect is enhanced;
(6) the working range of the damper is limited within 0.4 time of oil film clearance by controlling the thickness of the plastic material ring (or the easily-abraded material ring), and the linear change of the oil film rigidity of the damper is kept.
Description of the drawings:
FIG. 1 is a schematic diagram of an open squeeze film damper of the prior art;
FIG. 2 is a schematic diagram of a closed squeeze film damper of the prior art;
FIG. 3 is a schematic structural view of a labyrinth seal type squeeze film damper according to embodiment 1 of the present invention;
fig. 4 is a schematic view of a partial structure of the part I in fig. 3 in embodiment 1 of the present invention, wherein:
1-elastic support, 2-damper outer ring, 3-rotor, 4-damper inner ring, 5-oil supply groove, 6-oil film, 7-oil supply hole, 8-labyrinth and 9-plastic material ring.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to examples.
In order to facilitate a clear understanding of the invention, specific examples of plastic materials for the ring of material are given below and the invention is described in further detail.
The utility model provides a labyrinth sealed squeeze film damper, the bearing is outside located to the elastic support cover, the bearing outside be equipped with the bearing frame, the elastic support head be the attenuator inner circle, the bearing frame be the attenuator outer lane, the bearing endotheca rotor, attenuator outer lane and attenuator inner circle clearance fit, the clearance be the oil film clearance, the attenuator outer lane be equipped with the oil supply tank, the oil supply tank has been seted up and has been supplied oil hole, the oil supply hole locate oil film clearance top, wherein: the damper comb tooth sealing adopts one of the following modes:
the end part of the outer ring of the damper is circumferentially provided with a grid tooth, the end part of the inner ring of the damper is circumferentially provided with a groove, a plastic material ring or an easily-ground material ring is arranged in the groove, and the grid tooth at the end part of the outer ring of the damper is arranged corresponding to the material ring of the inner ring of the damper;
and (II) a groove is formed in the circumferential direction of the end part of the outer ring of the damper, comb teeth are formed in the circumferential direction of the end part of the inner ring of the damper, a plastic material ring or an easily-ground material ring is arranged in the groove, and the material ring at the end part of the outer ring of the damper and the comb teeth of the inner ring of the damper are arranged correspondingly.
The elastic supporting piece and the rotor are concentrically arranged through a bearing.
The lubricating oil is ISO VG2, and forms an oil film.
The depth of the groove formed in the outer ring or the inner ring of the damper corresponds to the thickness of the plastic material ring or the easily-ground material ring.
The bottom of the comb tooth is horizontal to the bottom of the oil film gap, and the height of the top of the comb tooth is slightly smaller than the oil film gap.
The longitudinal thickness of the plastic material ring or the easily-worn material ring is reasonably designed according to the maximum unbalanced force borne by the engine, and the oil film clearance is less than or equal to 0.4 time.
In the working process of the comb-tooth sealed type squeeze film damper, the rotor rotates at a high speed, the comb tooth extrudes a plastic material ring or an easily-ground material ring, when the comb-tooth sealed type squeeze film damper is a plastic material ring, the plastic material ring deforms, a tooth-shaped groove is formed in the surface of the plastic material ring, and then the comb-tooth sealed type squeeze film damper and the plastic material ring form a closer fit relation, so that the sealing effect is enhanced. When the ring is made of easily-ground material, after the ring is contacted with the grate and worn, a wear groove is left on the ring, so that the sealing capability is enhanced.
In the working process of the comb-tooth sealed squeeze film damper, the eccentricity ratio is less than or equal to 0.4 by controlling the thickness of a plastic material ring or an easily-ground material ring to be less than or equal to 0.4 time of an oil film gap, and the eccentricity ratio is equal to a dynamic eccentricity/oil film gap.
Example 1
A comb-tooth sealing type squeeze oil film damper is shown in a structural schematic diagram of fig. 3, an elastic support 1 and a rotor 3 are concentrically installed through a bearing, the head of the elastic support 1 serves as a damper inner ring 4, a bearing seat serves as a damper outer ring 2, the elastic support and the damper inner ring are in clearance fit, and lubricating oil is filled into a clearance through an oil supply hole 7 and an oil supply groove 5 to form an oil film 6. The schematic diagram of the partial structure of the part I is shown in fig. 4, a labyrinth 8 is added at the end part of the damper outer ring 2, a groove is formed at the end part of the corresponding damper inner ring 4, a circle of plastic material ring 9 is installed, and the labyrinth 8 and the plastic material ring 9 form an end part sealing structure.
When the embodiment is specifically processed, the two ends of the damper outer ring 2 are processed to form the comb tooth 8 with the height slightly smaller than the oil film clearance and the downward direction, and the comb tooth 8 and the damper inner ring 4 form clearance fit to facilitate assembly. Grooves with the width equal to the axial width of the comb tooth are respectively machined at two ends of the inner ring 4 of the damper, the depth of each groove is reasonably designed according to the maximum unbalanced force borne by the engine, and the oil film clearance is not more than 0.4 time. A circle of plastic material ring 9 with the depth of the groove is arranged on the groove, the upper surface of the plastic material ring 9 and the surface of the damper inner ring 4 are ensured to be at the same height, and the grid teeth 8 and the plastic material ring 9 are also in clearance fit. The damper inner ring 4, the damper outer ring 2, the comb teeth 8 and the plastic material ring 9 together form an approximately closed annular gap, and lubricating oil is injected into the gap to form an oil film 5.
When the rotor 3 is vibrated by the unbalanced force, the grid 8 is contacted and collided with the plastic material ring 9, and the plastic material ring 9 is slightly deformed. Due to the high rotation speed of the engine, the contact between the grid 8 and the plastic ring 9 occurs thousands of times, and each minute deformation is superposed together, and finally a small groove is formed on the plastic ring 9. The small slots are produced by the grate 8, their shape is that of the grate 8, and the depth is that maximum depth which the grate 8 can reach when the rotor 3 is subjected to maximum unbalanced forces. When the grid 8 comes into contact with the plastic ring 9 again, the grid 8 descends into the corresponding groove (not necessarily to the bottommost part), the radial clearance at the end of the damper is reduced, and the outward leakage of the lubricating oil is further hindered. In other words, the deformation of the ring 9 of plastic material does not only not impair the sealing effect, but rather reinforces it. The lubricating oil leakage amount of the damper is reduced, the oil film pressure is improved, the damping of the damper is increased, and the vibration damping capacity is improved. In addition, the thickness of the plastic material ring is not more than 0.4 time of oil film clearance, namely the working range of the damper is within 0.4 time of oil film clearance, and the oil film rigidity changes linearly within the range, so that the stability of a rotor system is facilitated.
Claims (6)
1. The utility model provides a comb tooth sealed squeeze film damper, the bearing outside is located to the cover, a serial communication port, including elastic support, the bearing outside be equipped with the bearing frame, the elastic support head be the attenuator inner circle, the bearing frame be the attenuator outer lane, the bearing endotheca rotor is equipped with, attenuator outer lane and attenuator inner circle clearance fit, the clearance be the oil film clearance, the attenuator outer lane be equipped with the oil feeding groove, the oil feeding hole has been seted up to the oil feeding groove, the oil film clearance top is located to the oil feeding hole, wherein: the damper comb tooth sealing adopts one of the following modes:
the end part of the outer ring of the damper is circumferentially provided with a grid tooth, the end part of the inner ring of the damper is circumferentially provided with a groove, a plastic material ring or an easily-ground material ring is arranged in the groove, and the grid tooth at the end part of the outer ring of the damper is arranged corresponding to the material ring of the inner ring of the damper;
and (II) a groove is formed in the circumferential direction of the end part of the outer ring of the damper, comb teeth are formed in the circumferential direction of the end part of the inner ring of the damper, a plastic material ring or an easily-ground material ring is arranged in the groove, and the material ring at the end part of the outer ring of the damper and the comb teeth of the inner ring of the damper are arranged correspondingly.
2. The labyrinth sealed squeeze film damper of claim 1 wherein said resilient support and rotor are concentrically mounted by a bearing.
3. The labyrinth sealed squeeze film damper according to claim 1, wherein the depth of the groove formed in the outer ring or the inner ring of the damper corresponds to the thickness of the plastic ring or the easily-worn ring.
4. The labyrinth sealed squeeze film damper according to claim 1, wherein the bottom of the labyrinth is horizontal to the bottom of the oil film gap, and the height of the top of the labyrinth is less than the oil film gap.
5. The labyrinth sealed squeeze film damper according to claim 1, wherein the plastic material ring or the easily-abraded material ring has a longitudinal thickness of not more than 0.4 times the oil film gap and an eccentricity of not more than 0.4.
6. The labyrinth sealed squeeze film damper of claim 1, wherein during operation, the rotor rotates at high speed, the labyrinth squeezes the plastic ring or the easily abradable ring, when the plastic ring, the plastic ring deforms, and forms a tighter fit with the labyrinth after the tooth-shaped groove is formed on the surface of the plastic ring, thereby enhancing the sealing effect; when the ring is made of easily-ground material, after the ring is contacted with the grate and worn, a wear groove is left on the ring, so that the sealing capability is enhanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104246.9A CN111207176A (en) | 2020-02-20 | 2020-02-20 | Comb tooth sealed squeeze film damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010104246.9A CN111207176A (en) | 2020-02-20 | 2020-02-20 | Comb tooth sealed squeeze film damper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111207176A true CN111207176A (en) | 2020-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010104246.9A Pending CN111207176A (en) | 2020-02-20 | 2020-02-20 | Comb tooth sealed squeeze film damper |
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| Country | Link |
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| CN (1) | CN111207176A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700794A (en) * | 2021-05-25 | 2021-11-26 | 北京化工大学 | Damper suitable for rotor bearing system |
| CN113950937A (en) * | 2021-09-24 | 2022-01-21 | 江苏大学 | Threshing cylinder vibration monitoring and reducing system and method and combine harvester |
-
2020
- 2020-02-20 CN CN202010104246.9A patent/CN111207176A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700794A (en) * | 2021-05-25 | 2021-11-26 | 北京化工大学 | Damper suitable for rotor bearing system |
| CN113950937A (en) * | 2021-09-24 | 2022-01-21 | 江苏大学 | Threshing cylinder vibration monitoring and reducing system and method and combine harvester |
| CN113950937B (en) * | 2021-09-24 | 2023-08-18 | 江苏大学 | Threshing cylinder vibration monitoring and slowing system and method and combine harvester |
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