CN110878812A - Extrusion oil film damper with gap capable of being controlled in split-phase mode - Google Patents
Extrusion oil film damper with gap capable of being controlled in split-phase mode Download PDFInfo
- Publication number
- CN110878812A CN110878812A CN201911332730.0A CN201911332730A CN110878812A CN 110878812 A CN110878812 A CN 110878812A CN 201911332730 A CN201911332730 A CN 201911332730A CN 110878812 A CN110878812 A CN 110878812A
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- China
- Prior art keywords
- end cover
- damper
- left end
- right end
- split
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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
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
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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
- F16F15/002—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion characterised by the control method or circuitry
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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
- F16F2230/00—Purpose; Design features
- F16F2230/18—Control arrangements
Abstract
The invention provides an extrusion oil film damper with a gap capable of being controlled in a split-phase mode. The squirrel cage is characterized in that a left end cover, a damper supporting piece and a right end cover are sequentially sleeved on an outer ring of the squirrel cage along the axial direction, and the damper supporting piece is fixedly connected with the left end cover through a left end cover fixing screw and a left end cover positioning pin and fixedly connected with the right end cover through a right end cover fixing screw and a right end cover positioning pin. According to the invention, the oil film clearance of each oil cavity can be adjusted according to the vibration state of the rotor system in a self-adaptive manner through the split phase of the external controller, so that the vibration reduction failure is prevented; in addition, within the range of full rotating speed, damping force with proper magnitude and direction is provided for the rotating machinery through split-phase adjustment of the gap, so that the vibration of the rotor system is optimally controlled.
Description
Technical Field
The invention belongs to the technical field of dampers, and particularly relates to an extruded oil film damper with a gap capable of being controlled in a split-phase mode.
Background
The Squeeze Film Damper (SFD) has a very simple structure. A cylindrical part is connected to the outer ring of a rotor bearing, and an annular gap is formed between the cylindrical part and a bearing seat to form an oil film cavity. The cylindrical part on the outer ring of the bearing is called an oil film ring. The oil film cavity is filled with pressure lubricating oil. Typically the oil film ring is restrained from spinning, but allows the journal to swirl freely within the oil chamber.
The squirrel cage is a cantilever type elastic supporting structure, one end of the squirrel cage is provided with a mounting edge fixed on a bearing seat of the casing, the other end of the squirrel cage is suspended, and a bearing is arranged in the squirrel cage to support a rotor. The rigidity of the squirrel-cage elastic support is changed, and the critical rotating speed is adjusted and controlled, so that the requirement of the design criterion of the critical rotating speed of the rotor system is met.
However, with the trend of high speed and large-scale of rotating machinery, the rotor system often works above the critical speed of one or more orders, the instability factors of the rotor system are increasing, such as sealing force, internal friction, unbalanced mass excitation, etc., and the limitation of SFD as passive control is gradually highlighted. Firstly, the steady-state working area of the SFD is narrow, and when the unbalance force of the rotor is too large or an emergency event such as unbalance occurs, the vibration reduction may fail; secondly, when the load is too large, due to the high nonlinearity of the oil film force, the rotor may have the phenomenon of bad mechanical properties such as bistable jump and the like; again, SFD is used to dampen the amplitude of vibration as the rotor system passes through the critical rotational speed. Due to the narrow tuning range of the SFD, the design parameters are not optimized over the entire operating speed range. For rotor systems operating above a first order critical speed, low damping is required to reduce transmitted forces when operating above the critical speed, but higher damping is required to ensure safe crossing of the critical speed when passing through the critical speed. Therefore, the optimum SFD parameter values must be determined to meet these two conflicting requirements. In addition to conflicting damping requirements, there are multiple optimal damping values in high speed rotor systems. However, since the conventional SFD cannot control the structural parameters, the above design problem cannot be solved.
Therefore, a technical scheme that damping force with proper magnitude and direction can be provided for a rotating machine through split-phase adjustment of gaps in a full rotating speed range, and vibration of a rotor system can be optimally controlled is urgently needed in the prior art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the gap split-phase controllable squeeze film damper which divides the traditional whole-circumference oil cavity, can independently adjust the gap of each oil cavity, prevents the phenomena of poor mechanical properties such as vibration attenuation failure, bistable jump and the like, provides damping force with proper size and direction for a rotating machine through split-phase adjusting the gap in the full rotating speed range, and enables the vibration of a rotor system to be optimally controlled.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the squeeze film damper with the gap capable of being controlled in a split-phase mode comprises a rotating shaft, a rolling bearing fixedly sleeved on the outer wall of the rotating shaft and a squirrel cage fixedly sleeved on the outer ring of the rolling bearing.
The squirrel cage is characterized in that a left end cover, a damper supporting piece and a right end cover are sequentially sleeved on an outer ring of the squirrel cage along the axial direction, and the damper supporting piece is fixedly connected with the left end cover through a left end cover fixing screw and a left end cover positioning pin and fixedly connected with the right end cover through a right end cover fixing screw and a right end cover positioning pin.
The damper support piece is characterized in that lower sliding blocks are arranged in the damper support piece at equal intervals along the circumferential direction, the upper end of each lower sliding block is fixedly connected with an upper sliding block through a fixing bolt, guide sleeves are respectively arranged on two sides of the fixing bolt in the upper sliding block, a guide pillar with one end penetrating through the guide sleeves is further arranged in the damper support piece, and a spring is further sleeved on the guide pillar.
The upper portion of the upper sliding block is provided with a piezoelectric ceramic driver, a pressing block is arranged above the piezoelectric ceramic driver, and the pressing block is fixedly connected with the damper supporting piece through a pressing block fixing screw.
And the damper supporting piece is respectively provided with an oil inlet and an oil outlet along the radial direction.
The lower surface of the pressing block is provided with a positioning hole, and the position of the positioning hole just corresponds to the position of the guide pillar.
And positioning grooves are formed in the side walls of the left end cover and the right end cover, and O-shaped sealing rings sleeved on the outer ring of the squirrel cage are embedded into the positioning grooves respectively.
The lower surface of the lower sliding block is an arc surface, and the arc surface is matched with the wall surface of the squirrel cage outer ring.
The piezoelectric ceramic driver is connected with an external power supply through a lead.
Compared with the prior art, the invention has the beneficial effects that: each group of piezoelectric ceramic drivers, the upper sliding block and the lower sliding block are arranged at equal intervals, and can provide proper voltage for each piezoelectric ceramic driver through an external controller in a phase-splitting self-adaptive manner according to the vibration state of a rotor system, each piezoelectric ceramic driver displaces under the action of an electric field to push the upper end part of each sliding block and the lower end part of each sliding block to move in the radial direction in the damper support, so that the oil film clearance of each oil cavity is adjusted, and the vibration reduction failure is prevented; in addition, within the range of full rotating speed, damping force with proper magnitude and direction is provided for the rotating machinery through split-phase adjustment of the gap, so that the vibration of the rotor system is optimally controlled.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic front view of the present invention.
Fig. 3 is a schematic top view of the present invention.
Fig. 4 is a right side view of fig. 2.
Fig. 5 is a sectional view taken along line a-a of fig. 2.
Fig. 6 is a partially enlarged view at C in fig. 5.
Reference numerals: 1-mouse cage, 2-left end cover, 3-right end cover, 4-rotating shaft, 5-conducting wire, 6-rolling bearing, 7-oil inlet hole, 8-left end cover fixing screw, 9-left end cover positioning pin, 10-O-shaped sealing ring, 11-oil outlet hole, 12-damper supporting piece, 13-pressing block fixing screw, 14-pressing block, 15-upper sliding block, 16-fixing bolt, 17-piezoelectric ceramic driver, 18-guide pillar, 19-guide sleeve, 20-spring, 21-lower sliding block, 22-right end cover fixing screw, 23-right end cover positioning pin and 24-positioning hole.
Detailed Description
1-6, the squeeze film damper comprises a rotating shaft 4, a rolling bearing 6 fixedly sleeved on the outer wall of the rotating shaft 4, and a squirrel cage 1 fixedly sleeved on the outer ring of the rolling bearing 6, wherein the outer ring of the squirrel cage 1 is sequentially sleeved with a left end cover 2, a damper support member 12 and a right end cover 3 along the axial direction, the damper support member 12 is fixedly connected with the left end cover 2 through a left end cover fixing screw 8 and a left end cover positioning pin 9, and is fixedly connected with the right end cover 3 through a right end cover fixing screw 22 and a right end cover positioning pin 23; in this embodiment, the circumference evenly sets up 6 left end lid set screws 8 and 6 right end lid set screws 22 respectively to two left end lid locating pins 9 and two right end lid locating pins 23 are set up to the symmetry respectively.
Lower sliding blocks 21 are arranged in the damper support piece 12 at equal intervals along the circumferential direction, the lower surfaces of the lower sliding blocks 21 are arc surfaces, the arc surfaces are matched with the outer ring wall surface of the mouse cage 1, when the lower sliding blocks 21 vibrate in the radial direction, the arc surfaces are in direct contact with the outer ring wall surface of the mouse cage 1, the arc surfaces can be just attached to the outer ring wall surface of the mouse cage 1, and unnecessary collision and abrasion are reduced. The upper end of each lower sliding block 21 is fixedly connected with an upper sliding block 15 through a fixing bolt 16, guide sleeves 19 are respectively arranged at two sides of the fixing bolt 16 in the upper sliding block 15, a guide post 18 with one end penetrating through the guide sleeves 19 is further arranged in the damper supporting part 12, a spring 20 is further sleeved on the guide post 18, a bulge is arranged at the lower end of the guide post 18, and the spring 20 is positioned between the guide sleeves 19 and the bulge; a piezoelectric ceramic driver 17 is arranged above the upper sliding block 15, a pressing block 14 is arranged above the piezoelectric ceramic driver 17, the pressing block 14 is fixedly connected with the damper support 12 through a pressing block fixing screw 13, a positioning hole 24 is arranged on the lower surface of the pressing block 14, the position of the positioning hole 24 just corresponds to the position of the guide pillar 18, and the upper end of the guide pillar 18 just inserts into the positioning hole 24; the damper support 12 is radially provided with an oil inlet hole 7 and an oil outlet hole 11, respectively.
The side walls of the left end cover 2 and the right end cover 3 are respectively provided with a positioning groove, and an O-shaped sealing ring 10 sleeved on the outer ring of the squirrel cage 1 is embedded into the positioning grooves respectively. The two O-shaped sealing rings 10 sleeved on the outer ring of the squirrel cage 1 are respectively embedded into the left end cover 2 and the right end cover 3, so that the O-shaped sealing rings 10 can be fixed in position, the axial sliding of the O-shaped sealing rings is avoided, a good sealing effect is achieved, and lubricating oil is prevented from leaking out of the side of the end covers.
Each piezo actuator 17 is connected to an external power source via a line 5 in order to control the respective piezo actuator 17 individually.
The working principle of the invention is as follows:
the damper support member 12 is sleeved on the outer ring of the squirrel cage 1, the lower sliding blocks 21 are inserted in the embedding positions reserved in the damper support member 12, the lower sliding blocks 21 are arranged at equal intervals along the circumferential direction, the number of the lower sliding blocks can be multiple, and the number of the lower sliding blocks is 6 in the embodiment. An upper slide block 15 is placed above each lower slide block 21, an internal thread hole is arranged between the upper slide block 15 and the lower slide block 21, the upper slide block and the lower slide block are screwed and fixed by a fastening bolt 16, guide sleeves 19 at two sides of the upper slide block 15 are just sleeved on two guide posts 18, the guide posts 18 are also sleeved with springs 20 in advance, the lower ends of the springs 20 abut against protrusions in the circumferential direction of the lower end parts of the guide posts 18, the upper ends of the springs 20 are abutted against the guide sleeves 19, a piezoelectric ceramic driver 17 is pressed on the upper surface of the upper slide block 15, a pressing block 14 is used for pressing the piezoelectric ceramic driver 17, the upper slide block 15 and other parts, a pressing block fixing screw 13 penetrates through preset screw holes on the pressing block 14 and on the damper supporting part 12 and is screwed tightly, all the parts can be tightly fixed into a whole, the springs 20 are also pressed, two positioning holes 24 are also arranged on the pressing, further enhancing the fastening effect.
In the initial state, the spring 20 is in a compressed state, so that the upper end surface of the upper slide block 15 is pressed against the lower end surface of the pressing block 14, an initial oil film gap is formed between the lower slide block 21 and the outer ring of the squirrel cage 1, and the piezoelectric ceramic driver 17 is in a compressed state. Secondly, lubricating oil is supplied to an oil supply hole 7 on a damper support 12 through an oil supply pump, enters an initial gap between the arc surface of the lower slider 21 and the outer ring of the squirrel cage 1 to form an oil film, and then flows through the oil outlet hole 11 and returns to the oil tank; finally, according to the vibration state of the rotor system, the external controller is used for providing proper voltage for each piezoelectric ceramic driver 17 in a phase splitting self-adaptive mode, each piezoelectric ceramic driver 17 is displaced under the action of an electric field, the upper sliding block 15 and the lower sliding block 21 are pushed to move in the damper supporting part 12 in the radial direction, the oil film gap of each oil cavity is further adjusted, the phenomena of poor mechanical characteristics such as vibration reduction failure and bistable jump are prevented, damping force with proper size and direction is provided for the rotary machine through the phase splitting adjusting gap in the full rotating speed range, and the vibration of the rotor system is controlled optimally.
In the description of the present invention, it is to be understood that the terms "left", "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The above is only a preferred embodiment of the present invention, but the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make several variations and modifications without departing from the inventive concept of the present invention, which fall into the protection scope of the present invention.
Claims (5)
1. An extrusion oil film damper with a gap capable of being controlled in a split-phase mode comprises a rotating shaft (4), a rolling bearing (6) fixedly sleeved on the outer wall of the rotating shaft (4) and a squirrel cage (1) fixedly sleeved on the outer ring of the rolling bearing (6),
the squirrel cage is characterized in that a left end cover (2), a damper supporting piece (12) and a right end cover (3) are sequentially sleeved on an outer ring of the squirrel cage (1) along the axial direction, the damper supporting piece (12) is fixedly connected with the left end cover (2) through a left end cover fixing screw (8) and a left end cover positioning pin (9), and is fixedly connected with the right end cover (3) through a right end cover fixing screw (22) and a right end cover positioning pin (23);
lower sliding blocks (21) are arranged in the damper support piece (12) at equal intervals along the circumferential direction, the upper end of each lower sliding block (21) is fixedly connected with an upper sliding block (15) through a fixing bolt (16), guide sleeves (19) are respectively arranged on two sides of the fixing bolt (16) in the upper sliding block (15), a guide pillar (18) with one end penetrating through the guide sleeves (19) is further arranged in the damper support piece (12), and a spring (20) is further sleeved on the guide pillar (18);
a piezoelectric ceramic driver (17) is arranged above the upper sliding block (15), a pressing block (14) is arranged above the piezoelectric ceramic driver (17), and the pressing block (14) is fixedly connected with the damper support piece (12) through a pressing block fixing screw (13);
and the damper supporting piece (12) is respectively provided with an oil inlet hole (7) and an oil outlet hole (11) along the radial direction.
2. The squeeze film damper with the split-phase gap controllable function as claimed in claim 1, wherein a positioning hole (24) is formed in the lower surface of the pressing block (14), and the position of the positioning hole (24) is just corresponding to the position of the guide pillar (18).
3. The squeeze film damper with the gap split-phase control function according to claim 1, wherein the side walls of the left end cover (2) and the right end cover (3) are respectively provided with a positioning groove, and an O-shaped sealing ring (10) sleeved on the outer ring of the squirrel cage (1) is embedded in each positioning groove.
4. The squeeze film damper with the gap phase-separable control according to claim 1, wherein the lower surface of the lower sliding block (21) is an arc surface, and the arc surface is matched with the wall surface of the outer ring of the squirrel cage (1).
5. The squeeze film damper with phase-separable control of gap according to claim 1, characterized in that the piezoceramic actuator (17) is connected to an external power supply via a wire (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332730.0A CN110878812A (en) | 2019-12-22 | 2019-12-22 | Extrusion oil film damper with gap capable of being controlled in split-phase mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332730.0A CN110878812A (en) | 2019-12-22 | 2019-12-22 | Extrusion oil film damper with gap capable of being controlled in split-phase mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110878812A true CN110878812A (en) | 2020-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911332730.0A Pending CN110878812A (en) | 2019-12-22 | 2019-12-22 | Extrusion oil film damper with gap capable of being controlled in split-phase mode |
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| CN (1) | CN110878812A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692257A (en) * | 2020-06-17 | 2020-09-22 | 华中科技大学 | Extrusion film type self-tuning vibration absorber |
| CN113950937A (en) * | 2021-09-24 | 2022-01-21 | 江苏大学 | Threshing cylinder vibration monitoring and reducing system and method and combine harvester |
| CN114856711A (en) * | 2022-05-12 | 2022-08-05 | 湖南科技大学 | Method and system for controlling vibration of rotor of turboshaft engine |
-
2019
- 2019-12-22 CN CN201911332730.0A patent/CN110878812A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111692257A (en) * | 2020-06-17 | 2020-09-22 | 华中科技大学 | Extrusion film type self-tuning vibration absorber |
| 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 |
| CN114856711A (en) * | 2022-05-12 | 2022-08-05 | 湖南科技大学 | Method and system for controlling vibration of rotor of turboshaft engine |
| CN114856711B (en) * | 2022-05-12 | 2023-09-15 | 湖南科技大学 | Method and system for controlling rotor vibration of turboshaft engine |
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