A vibration reduction device combining a squirrel cage spring support and an electrorheological fluid damper.

Abstract

This invention discloses a combined vibration reduction device of a squirrel-cage spring and an electrorheological fluid damper, belonging to the field of vibration control for rotating power machinery. It includes a squirrel-cage spring and an electrorheological fluid damper. The squirrel-cage spring is coaxially mounted to the rotor end via bearings, and the annular electrorheological fluid damper is mounted on the outer diameter surface of the squirrel-cage spring. The mounting base of the damper and the squirrel-cage spring form the mounting area for the other components of the damper. The inner bushing, dynamic friction ring, left sealing shell, right sealing shell, and static friction ring of the damper form a closed chamber filled with electrorheological fluid. The left and right electrodes are located within the accommodating cavity of the electrorheological fluid and are used to adjust the viscosity of the electrorheological fluid via an external power supply. Thus, when the dynamic friction ring vibrates with the squirrel-cage spring, different viscosities of the electrorheological fluid will generate different resistances to the movement of the dynamic friction ring, achieving active damping adjustment and more effectively reducing rotor vibration. This solves the problem that existing rotor system vibration reduction devices cannot perform damping adjustment.

Description

Technical Field

[0001] This invention belongs to the field of vibration control of rotating power machinery, specifically relating to a combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper, used for active control of rotor vibration. Background Technology

[0002] When the rotor of rotating power machinery passes its critical speed, the vibration amplitude increases sharply, easily exceeding the vibration limit and potentially causing damage such as bearing failure, rotor-stationary rubbing, loose bearing housings, and shaft breakage. Therefore, rotor dynamics design generally follows the "speed margin" design principle, ensuring a certain avoidance ratio between the rotor system's critical speed and operating speed to prevent excessive vibration at the operating speed. Additionally, adding damping at the rotor supports to increase vibration energy dissipation can also effectively reduce rotor vibration levels.

[0003] Combinations of squeeze film dampers (SFD) and squirrel-cage elastic supports (SFS) are commonly used for vibration reduction in rotor systems of rotating power machinery. The squirrel-cage support, with its low stiffness, supports the rotor and allows adjustment of the critical speed of the rotor system, thereby increasing the speed margin between the critical speed and the operating speed. The SFD is positioned around the outer ring of the SFD. When rotor vibration is transmitted to the SFD, the displacement of the SFD compresses the oil film inside the SFD, generating an oil film force to suppress rotor vibration. Traditional squirrel-cage support-SFD combinations are passive vibration reduction structures. Once the structural parameters of the squirrel-cage support and SFD are determined, the damping value they provide to the rotor cannot be manually intervened. While SFDs provide good vibration reduction when rotor vibration is within a certain range, they can cause rotor system instability when the vibration exceeds the limit. To address this problem and improve the controllability of rotor system damping, researchers have proposed controllable SFD structures. However, these structures still suffer from system complexity, slow response speed, and strong nonlinearity, posing significant challenges for practical applications.

[0004] Electrorheological fluids (EMFs) are intelligent vibration damping materials whose viscosity changes with the intensity of an electric field. They offer advantages such as fast response, good linearity, strong controllability, and a wide damping range, making them suitable for damper design. However, existing EMF dampers are primarily traditional piston-type structures, capable of unidirectional vibration damping. Since rotor vibration is omnidirectional, existing EMF dampers are not applicable. Therefore, exploring the use of EMFs for active damping adjustment in rotor systems to reduce vibration warrants further investigation. Summary of the Invention

[0005] The technical problem to be solved:

[0006] To avoid the shortcomings of the prior art, the present invention provides a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper. By designing an electrorheological fluid damper suitable for circumferential vibration and installing it in conjunction with the squirrel cage spring support, a combined vibration reduction device with adjustable damping value is provided for the rotor system, solving the problem that existing rotor system vibration reduction devices cannot adjust damping.

[0007] The technical solution of the present invention is: a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper, comprising a squirrel cage spring support and an electrorheological fluid damper; the squirrel cage spring support is coaxially mounted on the end of the rotor and connected to the rotor through a bearing to support the rotor; the electrorheological fluid damper is generally annular, coaxially mounted on the outer diameter surface of the squirrel cage spring support and located at the bearing mounting position, used to provide damping to suppress the vibration of the rotor and the squirrel cage spring support, and its damping value is adjustable;

[0008] The electrorheological fluid damper includes a mounting base, an inner bushing, a dynamic friction ring, a static friction ring, a left sealing shell, a right sealing shell, an electrorheological fluid, a left electrode, and a right electrode. The mounting base is annular, coaxially fitted onto the outer ring of the squirrel cage spring, and fixedly connected to the squirrel cage spring via a connector. The inner annular surface of the mounting base and the outer diameter surface of the squirrel cage spring form the mounting area for the other components of the electrorheological fluid damper. The inner bushing is axially limited and coaxially fitted onto the outer diameter surface of the squirrel cage spring. The dynamic friction ring is coaxially fitted onto the outer diameter surface of the inner bushing and fixedly connected thereto. The left and right sealing shells are mirror images of each other and are mated together, respectively fixedly installed on both axial sides of the inner bushing. The static friction ring is coaxially fitted onto the left and right sealing shells. The outer ring has a radial clearance of A with the two sealing shells. Radial stationary ring fins are provided around the circumference at the axial center of the inner diameter wall of the stationary friction ring. These fins are inserted into the mating gap between the left and right sealing shells and are sealed to both shells. The outer diameter surface of the stationary friction ring contacts the inner ring surface of the mounting base, and the stationary friction ring is axially limited and fixed to the mounting base. The inner bushing, dynamic friction ring, left sealing shell, right sealing shell, and stationary friction ring form a closed chamber filled with electrorheological fluid. The left and right electrodes are fixed to the axially opposite inner walls of the left and right sealing shells, respectively, and are connected to the positive and negative terminals of an external power supply to create an axial potential difference between the left and right electrodes.

[0009] A further technical solution of the present invention is: one end of the squirrel cage spring support has a bearing mounting surface in the inner hole for engaging with the outer ring of the bearing installed on the rotor; the other end of the squirrel cage spring support has a first flange for connecting the adapter; the first flange end of the squirrel cage spring support is embedded in the mounting hole of the load-bearing support; multiple cage bars are evenly distributed circumferentially in the middle part of the squirrel cage spring support.

[0010] A further technical solution of the present invention is: the mounting base is a two-half-ring docking structure, including an upper lobe mounting base and a lower lobe mounting base with the same structure, which are docked vertically on the horizontal plane where the rotor axis is located, and the docking point is connected by fasteners to form a complete ring; the mounting base is provided with a second flange at the first flange end near the squirrel cage spring support for connecting the adapter body; one end of the adapter body is fixedly connected to the second flange of the mounting base, and the other end is fixedly connected to the first flange of the squirrel cage spring support and the load-bearing support.

[0011] A further technical solution of the present invention is: the inner bushing is annular, and the outer diameter surface of the inner bushing is provided with a circumferential inner groove. The bottom wall of the inner groove is evenly distributed with a plurality of radially arranged threaded holes for installing the dynamic friction ring; the inner bushing is evenly distributed with a plurality of axially arranged threaded holes on both sides of the outer wall for installing the left sealing shell and the right sealing shell.

[0012] A further technical solution of the present invention is as follows: the dynamic friction ring is a two-half-ring docking structure, including an upper-half dynamic friction ring and a lower-half dynamic friction ring with the same structure, which are docked vertically on the horizontal plane where the rotor axis is located to form a complete ring; both halves of the dynamic friction ring are fixed in the inner groove on the corresponding side of the inner bushing by screws; the outer diameter surface of the dynamic friction ring is provided with two dynamic ring fins radially at the axial center position, the dynamic ring fins are arranged in a complete circle, and the two dynamic ring fins are offset from the stationary ring fins of the stationary friction ring and are located on both sides of the stationary ring fins.

[0013] A further technical solution of the present invention is as follows: both the left and right sealing shells are L-shaped annular structures with mirror-image main structures, and the L-shaped openings are paired and used in pairs; the left sealing shell includes a radially arranged left vertical plate and a left ring plate perpendicular to the left vertical plate and located at the outer diameter end of the left vertical plate, and the inner diameter end of the left vertical plate is fixedly connected to the axial outer side wall of the inner bushing; the right sealing shell includes a radially arranged right vertical plate and a right ring plate perpendicular to the right vertical plate and located at the outer diameter end of the right vertical plate, and the inner diameter end of the right vertical plate is fixedly connected to the axial inner side wall of the inner bushing; there is a gap at the joint between the left and right ring plates for inserting the stationary ring fins of the static friction ring;

[0014] The left vertical plate has two threaded through holes spaced 180° apart near the left ring plate on the same circumference. The plane containing the axis of the two threaded through holes is perpendicular to the horizontal plane. The one located above is the injection hole, and the one located below is the discharge hole. Both the injection hole and the discharge hole are sealed by threaded plugs.

[0015] A further technical solution of the present invention is as follows: the static friction ring is a two-half-ring docking structure, including an upper-half static friction ring and a lower-half static friction ring with identical structures. The two are docked vertically on the horizontal plane where the rotor axis is located to form a complete ring, and docking also forms a static ring fin of the complete ring. The static ring fin is vertically inserted into the docking point of the left ring plate and the right ring plate, and there is a gap, and it is sealed with the left ring plate and the right ring plate respectively by sealing rings. The gap A is the gap between the inner diameter of the static friction ring on both sides of the static ring fin and the outer diameter of the left ring plate and the right ring plate respectively. The gap A is not less than the maximum vibration displacement of the rotor at the bearing support.

[0016] A further technical solution of the present invention is: the axial length of the static friction ring is equal to the sum of the axial length of the inner bushing, the axial thickness of the left vertical plate, and the axial thickness of the right vertical plate; the axial length of the dynamic friction ring is less than the difference between the axial length of the inner bushing and the axial thickness of the left electrode and the right electrode; the static friction ring is a stationary component, and the dynamic friction ring vibrates together with the spring support of the squirrel cage.

[0017] A further technical solution of the present invention is as follows: one end of the right vertical plate facing away from the inner bushing is axially limited by an annular step provided on the outer diameter of the squirrel cage spring support; one end of the left vertical plate facing away from the inner bushing is axially limited by a damper locking nut, and the outer end of the squirrel cage spring support is provided with an external thread for installing the damper locking nut; the inner end of the static friction ring is axially limited by an annular boss provided in the mounting base, and the outer end face of the static friction ring is axially limited by a limiting ring, and the outer end of the inner diameter of the mounting base is provided with an inwardly recessed annular groove for installing the limiting ring.

[0018] A further technical solution of the present invention is that the inner liner, the left sealing shell and the right sealing shell are all made of insulating rigid material.

[0019] Beneficial effects

[0020] The beneficial effects of this invention are as follows: This invention provides a combined vibration reduction device of a squirrel-cage spring support and an electrorheological fluid damper, which is used to reduce vibration in a rotor system. The electrorheological fluid damper is designed as a ring structure and fitted onto the outer diameter surface of the connection between the squirrel-cage spring support and the rotor bearing. Each component of the electrorheological fluid damper is coaxially assembled with the rotor. The mounting base, serving as the damper's housing, is fixed to the squirrel-cage spring support via a transition body. The inner bushing, dynamic friction ring, left sealing shell, right sealing shell, and static friction ring of the electrorheological fluid damper form a closed chamber filled with electrorheological fluid. Left and right electrodes, respectively fixed to the axially opposite inner walls of the left and right sealing shells, are connected to the positive and negative terminals of an external power supply to create an axial potential difference. By adjusting the voltage between the left and right electrodes, the viscosity of the electrorheological fluid in the sealed chamber can be changed. When the dynamic friction ring vibrates with the squirrel-cage spring support, different viscosities of the electrorheological fluid will generate different resistances to the movement of the dynamic friction ring, thereby achieving active damping adjustment for more effective reduction of rotor vibration.

[0021] The present invention discloses a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper. It utilizes the characteristic that the viscosity of electrorheological fluid changes with voltage and has a large range of variation to adjust the damping of the rotor-squirrel cage spring support system. This enables controlled variation of the damping of the rotor support system, thereby enhancing the controllability and stability of the rotor system damping and achieving active and reliable suppression of rotor system vibration. It also has the advantages of fast response speed, large damping variation range and good damping linearity.

[0022] The present invention discloses a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper. Taking into account the characteristics of the rotor structure, the electrorheological fluid damper is designed as a ring structure. The electrorheological fluid and damper fins (including stationary ring fins and moving ring fins) are evenly distributed along the circumference of the damper, which can ensure that the damper has good damping isotropicity.

[0023] The present invention discloses a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper. The electrorheological fluid damper component adopts a modular design, and the overall axial length, overall radial thickness, and structural parameters such as the number / radial length of fins set on the static friction ring and dynamic friction ring can be designed and adjusted according to the damping value requirements. It has high flexibility, strong applicability, and is convenient for overall replacement. Attached Figure Description

[0024] Figure 1 This is a front cross-sectional schematic diagram of a combined vibration reduction device of a squirrel cage spring support-electrorheological fluid damper provided in an embodiment of the present invention;

[0025] Figure 2 This is a left view of a combined vibration reduction device of a squirrel cage spring support and electrorheological fluid damper provided in an embodiment of the present invention.

[0026] Figure 3 yes Figure 1 Enlarged view of the structure at point C;

[0027] Figure 4 This is a full sectional view of the components of the electrorheological damper in an embodiment of the present invention (with the mounting base hidden);

[0028] Figure 5 The figure shows the rotor speed increase amplitude variation curves obtained from simulations using existing extrusion oil film dampers and the electrorheological fluid dampers of this invention.

[0029] Explanation of reference numerals in the attached diagram: 1-Upper lobe mounting base, 2-Upper lobe static friction ring, 3-Left sealing shell, 4-Right sealing shell, 5-Left electrode, 6-Right electrode, 7-Sealing ring, 8-Electror-modulated fluid, 9-Upper lobe dynamic friction ring, 10-Inner bushing, 11-Damper locking nut, 12-Bearing locking nut, 13-Bearing, 14-Transition body, 15-Bearing support, 16-Squirrel cage spring support, 17-Lower lobe static friction ring, 18-Lower lobe dynamic friction ring, 19-Limiting ring, 20-Lower lobe mounting base, 21-Rotor, 22-Static ring fin of upper lobe static friction ring, 23-Dynamic ring fin of upper lobe dynamic friction ring, 24-Injection hole, 25-Drain hole. Detailed Implementation

[0030] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] See Figure 1 , 2 This embodiment provides a combined vibration reduction device of squirrel cage spring support and electrorheological fluid damper, including squirrel cage spring support 16, electrorheological fluid damper and adapter.

[0033] The squirrel cage spring support 16 is coaxially mounted on the end of the rotor 21 and connected to the rotor 21 via bearing 13. The squirrel cage spring support 16 supports the rotor 21 and acts as a buffer and vibration damper. The electrorheological fluid damper is ring-shaped and coaxially mounted on the outer diameter surface of the squirrel cage spring support 16. Its axial position is located at the mounting point of bearing 13. The electrorheological fluid damper provides damping to suppress the vibration of the rotor 21 and the squirrel cage spring support 16, and its damping value is adjustable.

[0034] The squirrel cage spring support 16 has a bearing mounting surface at one end of its inner bore for interference fit with the outer ring of the bearing 13 mounted on the rotor 21. A bearing limiting platform is located inside the bearing mounting surface of the squirrel cage spring support 16 for axial limiting of the outer ring of the bearing 13. An internal thread is located outside the bearing mounting surface of the squirrel cage spring support 16 for installing the bearing locking nut 12 to lock the position of the bearing 13. A first flange is located at the other end of the squirrel cage spring support 16 for connecting the adapter body 14; the first flange end of the squirrel cage spring support 16 is embedded in the mounting hole of the load-bearing support 15. Multiple cage bars are evenly distributed circumferentially in the middle section of the squirrel cage spring support 16. The number, width, length, thickness, and other structural parameters of the cage bars are designed according to the required support stiffness. The squirrel cage spring support 16 can be a single-stage squirrel cage spring support, a multi-stage squirrel cage spring support, or a folding-back squirrel cage spring support.

[0035] The adapter 14 is a rotating body with flange connections at both ends. One end of the adapter 14 is fixedly connected to the mounting housing of the electrorheological fluid damper, while the other end has inner and outer double flanges. The inner ring hole of the double flange is fixedly connected to the first flange of the squirrel cage spring support 16 by bolts, and the outer ring hole is fixedly connected to the bearing support 15 by bolts. The adapter 14 secures the squirrel cage spring support 16, the mounting housing of the electrorheological fluid damper, and the bearing support 15, with the bearing support 15 providing overall load-bearing support.

[0036] See also Figure 3 , 4 The electrorheological fluid damper includes a mounting base, an inner bushing 10, a static friction ring, a dynamic friction ring, a left sealing shell 3, a right sealing shell 4, an electrorheological fluid 8, a sealing ring 7, a left electrode 5, and a right electrode 6.

[0037] The mounting base is an annular shell, serving as the mounting housing for the electrorheological fluid damper. The mounting base has a two-half-ring buttress structure, including an upper-half mounting base 1 and a lower-half mounting base 20 with identical structures. These two halves are buttressed on the horizontal plane containing the axis of the rotor 21, and the buttress is fixed by fasteners to form a complete annular mounting housing. A second flange is provided at the end of the mounting base facing the first flange of the squirrel cage spring support 16, for circumferential connection and fixation with the adapter body 14 via bolts. The inner annular surface of the complete annular mounting base formed by the upper-half mounting base 1 and the lower-half mounting base 20, together with the outer diameter surface of the squirrel cage spring support 16, forms the mounting area for the other components of the electrorheological fluid damper. Specifically, radially from the inside out, the structure, mounting relationship, and function of the remaining components of the electrorheological fluid damper are described below:

[0038] The inner bushing 10 is annular in shape and made of insulating rigid material. It is coaxially and axially positioned on the outer diameter surface of the squirrel cage spring support 16. A U-shaped groove is circumferentially arranged on the outer diameter surface of the inner bushing 10 for mounting the dynamic friction ring. Multiple radially arranged threaded holes are evenly distributed on the bottom wall of the groove for fixing the dynamic friction ring with screws. Multiple axially arranged threaded holes are evenly distributed on the circumference of the outer walls on both axial sides of the inner bushing 10 for mounting the left sealing shell 3 and the right sealing shell 4. The axial positioning of the inner bushing 10 is achieved after the installation of the left sealing shell 3 and the right sealing shell 4, resulting in overall axial positioning.

[0039] The dynamic friction ring is coaxially fitted into the inner groove on the outer diameter surface of the inner bushing. The inner diameter surface of the dynamic friction ring contacts and is fixedly connected to the bottom surface of the inner groove. The dynamic friction ring is a two-half-ring buttress structure, including an upper-half dynamic friction ring 9 and a lower-half dynamic friction ring 18 with identical structures, which are buttressed vertically on the horizontal plane where the rotor axis is located to form a complete ring. Both halves of the dynamic friction ring are fixed to the inner grooves on the upper and lower sides of the inner bushing 10 by screws. Two dynamic ring fins are radially arranged on the outer diameter surface of the dynamic friction ring at the axial center position. The dynamic ring fins are arranged in a complete circle, formed by buttressing the half-ring dynamic ring fins of the upper-half dynamic friction ring 9 and the lower-half dynamic friction ring 18. Figure 3 As shown, the moving ring fins of the two upper-lobed moving friction rings are arranged radially outward. The moving friction ring is a moving part, and the moving friction ring and its moving ring fins vibrate together with the squirrel cage spring support 16.

[0040] Both the left sealing shell 3 and the right sealing shell 4 are L-shaped annular structures with mirror-like main structures. The only difference is that the left sealing shell 3 has an injection hole 24 and a discharge hole 25. The L-shaped openings of the left sealing shell 3 and the right sealing shell 4 face each other and are used in pairs, respectively fixedly installed on both axial sides of the inner bushing 10. The left sealing shell 3 includes a radially arranged annular left vertical plate and an annular left ring plate perpendicular to the left vertical plate and located at the outer diameter end of the left vertical plate. The inner diameter end of the left vertical plate has multiple axially arranged threaded holes evenly distributed around its circumference, and is fixedly connected to the axial outer side wall of the inner bushing 10 by multiple screws. The right sealing shell 4 includes a radially arranged annular right vertical plate and an annular right ring plate perpendicular to the right vertical plate and located at the outer diameter end of the right vertical plate. The inner diameter end of the right vertical plate has multiple axially arranged threaded holes evenly distributed around its circumference, and is fixedly connected to the axial inner side wall of the inner bushing 10 by multiple screws. One end of the right vertical plate facing away from the inner bushing 10 is axially limited by an annular step set on the outer diameter of the squirrel cage spring support 16. The other end of the left vertical plate facing away from the inner bushing 10 is axially locked by a damper locking nut 11. The outer end of the squirrel cage spring support 16 away from the load-bearing support 15 has an external thread for installing the damper locking nut 11. There is a gap at the joint between the left and right ring plates. The joint gap is located in the radial plane at the axial center of the inner bushing 10. The gap between the left and right ring plates is used to insert the stationary ring fins of the static friction ring. The materials of the left sealing shell 3 and the right sealing shell 4 are both insulating rigid materials.

[0041] The static friction ring is coaxially fitted around the outer rings of the left sealing shell 3 and the right sealing shell 4, with a radial gap between it and the outer diameters of the two sealing shells. The static friction ring is a two-half-ring buttress structure, including an upper-lobed static friction ring 2 and a lower-lobed static friction ring 17 with identical structures, which are buttressed vertically on the horizontal plane where the rotor axis is located to form a complete ring. Static ring fins are provided around the circumference at the axial center position of the inner diameter surface of the static friction ring, and the static ring fins are arranged radially, facing the dynamic friction ring. The static ring fins are arranged in a complete ring, formed by buttressing the semi-annular static ring fins of the upper-lobed static friction ring 2 and the lower-lobed static friction ring 17. The static ring fins are vertically inserted into the gap at the buttressing point of the left ring plate of the left sealing shell 3 and the right ring plate of the right sealing shell 4, and are sealed to the left and right ring plates on both sides by sealing rings 7. The sealing rings 7 are annular, and there are two of them, one installed at the buttressing end of the left ring plate and one at the right ring plate. The stationary ring fins are vertically inserted into the mating gap between the left and right ring plates. The stationary ring fins of the stationary friction ring and the two moving ring fins of the moving friction ring are staggered, with the two moving ring fins located on both sides of the stationary ring fins. The inner diameter of the stationary friction ring located on both sides of the stationary ring fins is larger than the outer diameter of the left and right ring plates. The difference in radius, i.e., the gap between them, is the design gap value of the electrorheological damper. This design gap value is not less than the maximum vibration displacement of the rotor at the bearing support. The outer diameter surface of the stationary friction ring contacts the inner ring surface of the mounting base and is axially limited and fixed with the mounting base. The upper lobe stationary friction ring 2 is matched and installed with the upper lobe mounting base 1, and the lower lobe stationary friction ring 17 is matched and installed with the lower lobe mounting base 20. The inner end of the stationary friction ring is axially limited by an annular boss provided in the mounting base, and the outer end face of the stationary friction ring is axially limited by a limiting ring 19. The outer end of the inner diameter of the mounting base has a concave annular groove for installing the limiting ring 19. The stationary friction ring is a stationary component.

[0042] The inner liner 10, the dynamic friction ring, the left sealing shell 3, the right sealing shell 5, the two sealing rings 7, and the stationary ring fins of the static friction ring form a closed chamber, which is filled with an electrorheological fluid 8. The electrorheological fluid 8 is a common electrorheological fluid or a giant electrorheological fluid. In another similar technical solution other than this embodiment, the electrorheological fluid 8 can also be replaced with a magnetorheological fluid. In the technical solution using a magnetorheological fluid, the left electrode 5 and the right electrode 6 are eliminated, and an electromagnetic induction coil is wound around the outer diameter wall of the static friction ring. The two ends of the coil are respectively connected to the positive and negative terminals of an external power supply. The viscosity of the magnetorheological fluid is changed by changing the magnetic flux of the induction coil.

[0043] Two threaded through holes are provided at 180° intervals within the same circumference of the left vertical plate of the left sealing shell 3, near the left annular plate. The plane containing the axes of the two threaded through holes is perpendicular to the horizontal plane. The upper one is the injection hole 24, and the lower one is the discharge hole 25. The injection hole 24 is used to inject electrorheological fluid 8 into the sealed chamber, and the discharge hole 25 is used to discharge the electrorheological fluid 8 from the sealed chamber. Both the injection hole 24 and the discharge hole 25 can be sealed by threaded plugging.

[0044] Both the left electrode 5 and the right electrode 6 are annular thin-film structures. The left electrode 5 is embedded in the radial gap between the inner bushing 10 and the left vertical plate of the left sealing shell 3, and is in close contact with the inner wall of the left vertical plate of the left sealing shell 3. The right electrode 6 is embedded in the radial gap between the inner bushing 10 and the right vertical plate of the right sealing shell 4, and is in close contact with the inner wall of the right vertical plate of the right sealing shell 4. The left electrode 5 and the right electrode 6 are respectively connected to the positive and negative terminals of an external power supply to form a potential difference along the axial direction between the left electrode 5 and the right electrode 6. Different potential differences will cause changes in the viscosity of the electrorheological liquid 8. The left electrode 5 has a through hole machined at a position corresponding to the injection hole 24 and the discharge hole 25 of the left sealing shell 3. The diameter of the through hole is larger than the diameter of the injection hole 24 and the discharge hole 25 of the left sealing shell 3.

[0045] In this embodiment, the inner bushing 10, dynamic friction ring, left sealing shell 3, right sealing shell 4, and static friction ring together form a controllable damping unit. The unit has a ring-shaped structure and is axially positioned between the mounting base and the outer diameter surface of the squirrel cage spring support 16. The axial length of the static friction ring is equal to the sum of the axial length of the inner bushing 10, the axial thickness of the left vertical plate, and the axial thickness of the right vertical plate. The axial length of the dynamic friction ring is less than the difference between the axial length of the inner bushing 10 and the axial thicknesses of the left electrode 5 and the right electrode 6. It should be noted that the axial length, radial width, number / radial length of the dynamic ring fins of the dynamic friction ring, and number / radial length of the static ring fins of the static friction ring can be designed according to the required damping magnitude of the controllable damping unit of the electrorheological damper.

[0046] This invention changes the viscosity of the electrorheological fluid 8 by controlling the voltage between the left electrode 5 and the right electrode 6. This alters the viscous resistance experienced by the moving friction ring during vibration. Simultaneously, the vibration of the moving friction ring drives the flow of the electrorheological fluid 8, changing the viscous friction within the fluid and thus altering the damping provided by the electrorheological fluid 8 damper. This invention combines the electrorheological fluid damper with a squirrel cage spring 16. The squirrel cage spring 16 is used to adjust the critical speed of the rotor system. The electrorheological fluid damper actively adjusts the damping of the rotor system by controlling the electric field voltage, thereby reducing rotor vibration.

[0047] See Figure 5 , Figure 5 The figures show the rotor speed increase amplitude curves obtained through simulation, comparing the existing squeeze film damper and the electrorheological damper of this invention. The horizontal axis represents rotor speed, and the vertical axis represents vibration amplitude. The black curve represents the simulation result of the existing fixed damper, while the black dashed line represents the simulation result after enhancing damping using the damper of this invention. It can be seen that near the critical speed of 7800 r / min, the vibration amplitude damped by the electrorheological damper of this invention is significantly reduced.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A combined vibration reduction device of a squirrel cage spring support and an electrorheological fluid damper, characterized in that, It includes a squirrel cage spring support and an electrorheological fluid damper; the squirrel cage spring support is coaxially mounted on the end of the rotor and connected to the rotor through a bearing to support the rotor; the electrorheological fluid damper is ring-shaped and coaxially mounted on the outer diameter surface of the squirrel cage spring support and located at the bearing mounting point, used to provide damping to suppress the vibration of the rotor and the squirrel cage spring support, and its damping value is adjustable. The electrorheological fluid damper includes a mounting base, an inner bushing, a dynamic friction ring, a static friction ring, a left sealing shell, a right sealing shell, an electrorheological fluid, a left electrode, and a right electrode. The mounting base is annular, coaxially fitted onto the outer ring of the squirrel cage spring, and fixedly connected to the squirrel cage spring via a connector. The inner annular surface of the mounting base and the outer diameter surface of the squirrel cage spring form the mounting area for the other components of the electrorheological fluid damper. The inner bushing is axially limited and coaxially fitted onto the outer diameter surface of the squirrel cage spring. The dynamic friction ring is coaxially fitted onto the outer diameter surface of the inner bushing and fixedly connected thereto. The left and right sealing shells are mirror images of each other and are mated together, respectively fixedly installed on both axial sides of the inner bushing. The static friction ring is coaxially fitted onto the outer rings of the left and right sealing shells and is connected to the diameter surfaces of the two sealing shells. The clearance is A, which is not less than the maximum vibration displacement of the rotor at the bearing support. Radial stationary ring fins are provided around the circumference at the axial center of the inner diameter surface of the stationary friction ring. The stationary ring fins are inserted into the mating gap between the left and right sealing shells and are sealed to both shells. The outer diameter surface of the stationary friction ring contacts the inner ring surface of the mounting base, and the stationary friction ring is axially limited and fixed to the mounting base. The inner bushing, dynamic friction ring, left sealing shell, right sealing shell, and stationary friction ring form a closed chamber filled with electrorheological fluid. The left and right electrodes are respectively fixed to the axially opposite inner walls of the left and right sealing shells and are respectively connected to the positive and negative terminals of an external power supply to create an axial potential difference between the left and right electrodes. The dynamic friction ring is a two-half ring docking structure, including an upper and lower lobe dynamic friction ring with identical structures, which are docked vertically on the horizontal plane where the rotor axis is located to form a complete ring; both lobe dynamic friction rings are fixed to the inner grooves on the corresponding sides of the inner bushing by screws; the outer diameter surface of the dynamic friction ring is provided with two dynamic ring fins radially at the axial center position, the dynamic ring fins are arranged in a complete circle, and the two dynamic ring fins are offset from the stationary ring fins of the static friction ring and are located on both sides of the stationary ring fins.

2. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The squirrel cage spring support has a bearing mounting surface in the inner hole at one end, which is used to mate with the outer ring of the bearing installed on the rotor; the squirrel cage spring support has a first flange at the other end, which is used to connect the adapter; the first flange end of the squirrel cage spring support is embedded in the mounting hole of the load-bearing support; multiple cage bars are evenly distributed circumferentially in the middle part of the squirrel cage spring support.

3. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The mounting base is a two-half-ring docking structure, including an upper lobe mounting base and a lower lobe mounting base with identical structures. The two are docked vertically on the horizontal plane where the rotor axis is located, and the docking point is connected by fasteners to form a complete ring. The mounting base is provided with a second flange at the first flange end near the squirrel cage spring support for connecting the adapter body. One end of the adapter body is fixedly connected to the second flange of the mounting base, and the other end is fixedly connected to both the first flange of the squirrel cage spring support and the load-bearing support.

4. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The inner bushing is annular, and the outer diameter surface of the inner bushing is provided with a circumferential inner groove. The bottom wall of the inner groove is evenly distributed with multiple radially arranged threaded holes for installing the dynamic friction ring. The outer walls of the inner bushing on both sides are evenly distributed with multiple axially arranged threaded holes for installing the left sealing shell and the right sealing shell.

5. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, Both the left and right sealing shells are L-shaped annular structures with mirror-image main structures, and their L-shaped openings are paired for use. The left sealing shell includes a radially arranged left vertical plate and a left annular plate perpendicular to the left vertical plate and located at the outer diameter end of the left vertical plate. The inner diameter end of the left vertical plate is fixedly connected to the axial outer wall of the inner bushing. The right sealing shell includes a radially arranged right vertical plate and a right annular plate perpendicular to the right vertical plate and located at the outer diameter end of the right vertical plate. The inner diameter end of the right vertical plate is fixedly connected to the axial inner wall of the inner bushing. There is a gap at the joint between the left and right annular plates for inserting the stationary ring fins of the static friction ring. The left vertical plate has two threaded through holes spaced 180° apart near the left ring plate on the same circumference. The plane containing the axis of the two threaded through holes is perpendicular to the horizontal plane. The one located above is the injection hole, and the one located below is the discharge hole. Both the injection hole and the discharge hole are sealed by threaded plugs.

6. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The static friction ring is a two-half ring mating structure, including an upper and lower halves of the static friction ring with identical structures. The two halves are mated vertically on the horizontal plane where the rotor axis is located to form a complete ring, and the mating also forms the static ring fins of the complete ring. The static ring fins are vertically inserted into the joint between the left and right ring plates, with a gap, and are sealed to the left and right ring plates on both sides by sealing rings respectively. The gap A is the gap between the inner diameter of the static friction ring on both sides of the static ring fins and the outer diameter of the left and right ring plates respectively. The gap A is not less than the maximum vibration displacement of the rotor at the bearing support.

7. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The axial length of the static friction ring is equal to the sum of the axial length of the inner bushing, the axial thickness of the left vertical plate, and the axial thickness of the right vertical plate; the axial length of the dynamic friction ring is less than the difference between the axial length of the inner bushing and the axial thickness of the left and right electrodes; the static friction ring is a stationary component, and the dynamic friction ring vibrates together with the spring support of the mouse cage.

8. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 5, characterized in that, The right vertical plate is axially limited at one end facing away from the inner bushing by an annular step set on the outer diameter of the squirrel cage spring support; the left vertical plate is axially limited at one end facing away from the inner bushing by a damper locking nut, and the outer end of the squirrel cage spring support is provided with an external thread for installing the damper locking nut; the inner end of the static friction ring is axially limited by an annular boss set in the mounting base, and the outer end face of the static friction ring is axially limited by a limiting ring, and the outer end of the inner diameter of the mounting base is provided with an inwardly recessed annular groove for installing the limiting ring.

9. The combined vibration reduction device of squirrel cage spring support-electrorheological fluid damper according to claim 1, characterized in that, The inner liner, left sealing shell, and right sealing shell are all made of insulating rigid material.

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