Rotor vibration damping structure based on magneto-rheological damper

Abstract

The utility model provides rotor damping structure based on magneto rheological damper, including the coil framework of coaxial cover setting on the rotor shaft, the coil framework is annular structure, and the inner ring of annular structure is circular array formula and is provided with three groups of coil main part and three groups of magnetism guide cylinder, wherein, three groups of coil main part and three groups of magnetism guide cylinder are alternately arranged between each other, the inner ring of coil framework is equipped with three coil installation cavities and three roller installation cavities, three groups of coil main part are installed in three coil installation cavities correspondingly, three groups of magnetism guide cylinder are installed in three roller installation cavities correspondingly, the support frame is connected through the support column between the magnetism guide cylinder, the magnetism ring is coaxial cooperation with the rotor shaft, and the support frame is located between the inner ring of magnetism ring and the outer ring of rotor shaft, wherein, the inner ring wall between the support frame and magnetism ring is connected through radial buffer piece, is used to play the buffering effect to the support frame.

Description

Technical Field

[0001] This utility model belongs to the field of rotor vibration reduction technology, and particularly relates to a rotor vibration reduction structure based on a magnetorheological damper. Background Technology

[0002] Magnetorheological dampers, with their ability to adjust damping force in real time via magnetic field, are increasingly widely used in rotor vibration control of high-speed rotating machinery, aero engines, and other equipment, becoming one of the important development directions of intelligent vibration reduction technology.

[0003] Currently, the closest existing technology for rotor vibration reduction using magnetorheological damping involves directly connecting the damping output structure of the magnetorheological damper to the rotor shaft. By energizing a coil, the magnetorheological fluid within the working gap undergoes a magnetic field-induced rheological effect, thereby generating a damping force to suppress rotor vibration. Specifically, a magnetic field is generated by the coil assembly, causing a change in the properties of the magnetorheological fluid within the gap of the damper's working chamber. The damping effect is then transmitted to the rotor shaft by the moving parts of the damper.

[0004] However, existing technologies have the following technical problems: it is difficult to distribute the damping force evenly in the circumference of the rotor, which causes local force imbalance in the rotor, affects the stability of the vibration reduction effect, and reduces the reliability and service life of the vibration reduction system. Utility Model Content

[0005] The purpose of this utility model embodiment is to provide a rotor vibration reduction structure based on a magnetorheological damper, which aims to solve the problem that the existing technology is difficult to make the damping force uniformly distributed in the circumference of the rotor, resulting in local force imbalance of the rotor and affecting the stability of the vibration reduction effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] According to one embodiment of the present invention, a rotor vibration reduction structure based on a magnetorheological damper is provided, comprising the following structure: Rotor shaft, A coil frame is coaxially mounted on the rotor shaft. The coil frame has a ring structure. The inner ring of the ring structure has three sets of coil bodies and three sets of magnetic rollers arranged in a circumferential array. The three sets of coil bodies and the three sets of magnetic rollers are arranged alternately. The inner ring of the coil frame has three coil mounting cavities and three roller mounting cavities. The three sets of coil bodies are installed in the three coil mounting cavities, and the three sets of magnetic rollers are installed in the three roller mounting cavities. The support frame is connected to the magnetic rollers via support columns. The magnetic ring is coaxially fitted with the rotor shaft, and the support frame is located between the inner ring of the magnetic ring and the outer ring of the rotor shaft. The support frame is connected to the inner ring wall of the magnetic ring by a radial buffer to cushion the support frame.

[0008] Furthermore, the coil frame has a central channel along its axis, which is used to pass through the rotor shaft, that is, the central channel is coaxially fitted with the rotor shaft.

[0009] Furthermore, each roller mounting cavity has a mounting port on its side for the support column to pass through.

[0010] Furthermore, the gap between the outer ring of the magnetic roller and the outer ring surface of the rotor shaft is 0.5mm-0.7mm.

[0011] Furthermore, the support column has a two-section structure, one section is a threaded section and the other section is a frustum section; the threaded section is screwed and fixed in the internal thread groove of the magnetic roller, which is used to connect and fix the support column and the magnetic roller; the frustum section is rotatably connected to the support frame.

[0012] Furthermore, the end of the frustum section is rotatably disposed in the annular cavity of the support frame, and the outer ring of the end of the frustum section located in the annular cavity has multiple balls to make the rotation process between the frustum section and the support frame smoother.

[0013] Furthermore, the radial buffer includes a sliding column connected to the inner ring wall of the magnetic ring, the other end of the sliding column being axially and coaxially extended into the sliding sleeve, and the sliding sleeve being fixedly installed in the support groove of the outer ring of the support frame; the radial buffer also includes a buffer spring, which is sleeved on the sliding column and the sliding sleeve.

[0014] Furthermore, one end of the buffer spring is connected to the inner wall of the magnetic ring, and the other end of the buffer spring is connected to the bottom wall of the support groove. The buffer spring is a key component that plays a buffering and supporting role in the radial buffer.

[0015] Furthermore, the outer surface of the coil frame is connected to the inner wall of the magnetic ring through an adhesive fixing layer.

[0016] Furthermore, a sealing ring is embedded between the end of the magnetic ring and the rotor shaft.

[0017] Compared with the prior art, the beneficial effect of the rotor vibration reduction structure based on the magnetorheological damper in this embodiment is that when there is eccentricity during the rotation of the rotor shaft, the rotor shaft and the magnetic roller will come into contact and drive the magnetic roller to rotate. Without affecting the rotational connection between the magnetic roller and the support frame, the support frame will be driven to generate radial displacement simultaneously. At this time, the radial buffer component is set to achieve the buffer support effect of the radial sway displacement of the support frame, so as to achieve vibration reduction. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0019] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of the rotor vibration reduction structure based on a magnetorheological damper of this utility model; Figure 2 A cross-sectional view of the coil frame in the rotor vibration reduction structure provided by this utility model; Figure 3 A schematic diagram showing the cooperation between the magnetic roller and the support column in the rotor vibration reduction structure provided by this utility model; Figure 4 for Figure 1 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the radial buffer component in the rotor vibration reduction structure provided by this utility model.

[0020] The above figures include the following reference numerals: 1. Rotor shaft; 2. Magnetic ring; 3. Magnetic roller; 31. Internal threaded groove; 4. Coil frame; 41. Coil mounting cavity; 42. Roller mounting cavity; 43. Mounting port; 44. Shaft channel; 5. Support column; 51. Frustum section; 52. Threaded section; 6. Support frame; 61. Annular cavity; 62. Ball bearing; 63. Support groove; 64. Radial buffer; 641. Sliding column; 642. Sliding sleeve; 643. Buffer spring; 7. Adhesive fixing layer; 8. Sealing ring sleeve. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] like Figure 1 and Figure 2 As shown, in one embodiment of this utility model, a rotor vibration reduction structure based on a magnetorheological damper is provided, including a rotor shaft 1 and a coil frame 4 coaxially sleeved on the rotor shaft 1. The coil frame 4 is a ring structure. The inner ring of the ring structure is arranged in a circumferential array with three sets of coil bodies and three sets of magnetic rollers 3, wherein the three sets of coil bodies and the three sets of magnetic rollers 3 are arranged alternately. Preferably, the inner ring of the coil frame 4 has three coil mounting cavities 41 and three roller mounting cavities 42, the three coil bodies are installed in the three coil mounting cavities 41, and the three magnetic rollers 3 are installed in the three roller mounting cavities 42.

[0025] Furthermore, in this embodiment of the present invention, the coil frame 4 has a central channel 44 along its axis, the central channel 44 is used to pass through the rotor shaft 1, that is, the central channel 44 is coaxially fitted with the rotor shaft 1; Furthermore, in this embodiment of the present invention, each roller mounting cavity 42 has a mounting opening 43 on its side, which is used to pass through the support column 5.

[0026] In this embodiment of the invention, the gap between the outer ring of the magnetic roller 3 and the outer ring surface of the rotor shaft 1 is 0.5-0.7mm.

[0027] For further details, please refer to [link / reference]. Figures 1-4 The rotor vibration reduction structure in this embodiment also includes a support frame 6, which is connected to the magnetic roller 3 via a support column 5. In this embodiment, the support column 5 has a two-section structure, one section is a threaded section 52, and the other section is a frustum section 51; wherein, the threaded section 52 is screwed and fixed in the internal thread groove 31 of the magnetic roller 3, which is used to connect and fix the support column 5 and the magnetic roller 3; the frustum section 51 is rotatably connected to the support frame 6. Specifically, regarding the rotational connection between the frustum segment 51 and the support frame 6, such as... Figure 4 As shown, the end of the frustum section 51 is rotatably disposed in the annular cavity 61 of the support frame 6, and the outer ring of the end of the frustum section 51 located in the annular cavity 61 has a plurality of balls 62, which are used to make the rotation process between the frustum section 51 and the support frame 6 smoother.

[0028] For further details, please refer to [link / reference]. Figure 1 and Figure 4 The rotor vibration damping structure in this embodiment also includes a magnetic ring 2, which is coaxially fitted with the rotor shaft 1. The support frame 6 is located between the inner ring of the magnetic ring 2 and the outer ring of the rotor shaft 1. The support frame 6 and the inner ring wall of the magnetic ring 2 are connected by a radial buffer 64, which serves to buffer the support frame 6.

[0029] In specific implementation, in the absence of eccentricity, the rotor shaft 1 does not come into contact with the magnetic roller 3 during its rotation. When there is eccentricity during the rotation of the rotor shaft 1, the rotor shaft 1 will come into contact with the magnetic roller 3 and drive the magnetic roller 3 to rotate. Without affecting the rotational connection between the magnetic roller 3 and the support frame 6, the support frame 6 will be driven to generate radial displacement simultaneously. At this time, the radial buffer 64 is set to achieve the buffering and support effect of the radial sway displacement of the support frame 6, so as to achieve vibration reduction.

[0030] Furthermore, such as Figure 4 and Figure 5 As shown, in this embodiment, the provided radial buffer 64 includes a sliding post 641 connected to the inner ring wall of the magnetic ring 2. The other end of the sliding post 641 is axially and coaxially slidably inserted into the sliding sleeve 642. The sliding sleeve 642 is fixedly installed in the support groove 63 of the outer ring of the support frame 6. The radial buffer 64 also includes a buffer spring 643, which is sleeved on the sliding post 641 and the sliding sleeve 642. Preferably, one end of the buffer spring 643 is connected to the inner wall of the magnetic ring 2, and the other end of the buffer spring 643 is connected to the bottom wall of the support groove 63. The buffer spring 643 is a key component that plays a buffering and supporting role for the radial buffer member 64.

[0031] For further details, please refer to [link / reference]. Figure 1 In this embodiment, the outer surface of the coil frame 4 is connected to the inner wall of the magnetic ring 2 by an adhesive fixing layer 7, wherein the adhesive fixing layer 7 uses an insulating adhesive (such as epoxy) to fix the coil frame 4 to the magnetic ring 2.

[0032] In specific implementation, the magnetorheological fluid in this embodiment mainly fills the annular gap between the outer ring of the magnetic roller 3 and the outer ring of the rotor shaft 1. This gap is the working area of ​​the magnetorheological fluid. When the rotor shaft 1 rotates eccentrically, it can directly squeeze the magnetorheological fluid in the gap to generate damping force. At the same time, the magnetorheological fluid also fills the tiny gap between the coil mounting cavity 41 and the coil body to fill the assembly gap after the coil is installed, so as to avoid the magnetic field being lost due to the air gap. For further details, please refer to [link / reference]. Figure 1 In this embodiment, a sealing ring 8 is embedded between the end of the magnetic ring 2 and the rotor shaft 1. The sealing ring 8 is a non-rigid material made of rubber.

[0033] In addition to the sealing ring sleeve 8, this embodiment also adds an annular O-ring seal on the outer surface of the coil frame 4 and the inner wall of the magnetic ring 2. The O-ring seal is made of nitrile rubber. The O-ring seal is embedded in the pre-set annular sealing groove on the outer ring of the coil frame 4 and fits tightly with the inner wall of the magnetic ring 2 to prevent the magnetorheological fluid from leaking from the bonding gap between the coil frame 4 and the magnetic ring 2. Furthermore, the sealing ring sleeve 8 is fitted with the rotor shaft 1 and the magnetic ring 2 by a clearance fit and grease-assisted sealing. The grease is an oil-resistant silicone-based grease, which is filled in the fit gap between the sealing ring sleeve 8 and the rotor shaft 1 to further block the channel for the magnetorheological fluid to leak along the rotor shaft 1 axially.

[0034] It should be noted that in this embodiment, a liquid injection hole is opened on the magnetic ring 2, and the liquid injection hole is equipped with a brass hexagonal screw plug. A flat washer is added between the screw plug and the liquid injection hole to ensure that there is no leakage after tightening. An vent hole is also opened on the top of the magnetic ring 2. The inner wall of the vent hole is machined with internal threads and equipped with a miniature hexagonal screw plug. During the liquid injection process, the air in the cavity is naturally discharged through the vent hole. When magnetorheological fluid overflows from the vent hole, it indicates that the air in the cavity has been discharged. At this time, the vent hole screw plug is tightened to complete the venting and sealing. The arrangement of the liquid injection hole and the vent hole is prior art that can be implemented independently by those skilled in the art, and is not specifically limited.

[0035] After the coil body is energized, the magnetic field generated by the current is transmitted along the closed magnetic circuit, causing the magnetorheological fluid in the gap between the magnetic roller 3 and the rotor shaft 1 to undergo a morphological change. When the coil is not energized, the magnetorheological fluid is in a liquid state, and the rotor shaft 1 can rotate freely. When the coil is energized (current 0.5A-2A), the magnetorheological fluid forms a chain structure under the action of the magnetic field, and the shear yield strength is significantly improved. At this time, if the rotor shaft 1 rotates eccentrically, it will squeeze the magnetorheological fluid in the core gap. The damping force generated by the magnetorheological fluid can directly suppress the eccentric vibration of the rotor shaft 1. At the same time, the rotor shaft 1 drives the magnetic roller 3 to rotate, which in turn pushes the support frame 6 to produce radial displacement. The buffer spring 643 of the radial buffer 64 undergoes elastic deformation, further absorbing vibration energy, and finally achieving the dual vibration reduction effect of magnetorheological damping and mechanical buffering.

[0036] The above solutions are merely illustrative examples of preferred embodiments, but are not limited thereto. When implementing this invention, appropriate substitutions and / or modifications can be made according to the user's needs.

[0037] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of this utility model will be readily apparent to those skilled in the art.

[0038] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A rotor vibration damping structure based on a magnetorheological damper, characterized by, Includes the following structure: Rotor shaft (1); A coil frame (4) is coaxially mounted on the rotor shaft (1). The coil frame (4) is a ring structure. The inner ring of the ring structure is arranged in a circular array with three sets of coil bodies and three sets of magnetic rollers (3). The three sets of coil bodies and the three sets of magnetic rollers (3) are arranged alternately. The inner ring of the coil frame (4) has three coil mounting cavities (41) and three roller mounting cavities (42). The three sets of coil bodies are installed in the three coil mounting cavities (41) and the three sets of magnetic rollers (3) are installed in the three roller mounting cavities (42). The support frame (6) is connected to the magnetic roller (3) by a support column (5); The magnetic ring (2) is coaxially fitted with the rotor shaft (1), and the support frame (6) is located between the inner ring of the magnetic ring (2) and the outer ring of the rotor shaft (1); wherein, the support frame (6) and the inner ring wall of the magnetic ring (2) are connected by a radial buffer (64).

2. The magnetorheological damper based rotor vibration mitigation structure according to claim 1, wherein The coil bobbin (4) has a central channel (44) along its axis, which is used to pass through the rotor shaft (1).

3. The rotor vibration reduction structure based on a magnetorheological damper according to claim 2, characterized in that, Each roller mounting cavity (42) has a mounting port (43) on its side, which is used to pass through the support column (5).

4. The magnetorheological damper based rotor vibration mitigation structure according to claim 3, wherein The gap between the outer ring of the magnetic roller (3) and the outer ring surface of the rotor shaft (1) is 0.5mm-0.7mm.

5. The rotor vibration reduction structure based on a magnetorheological damper according to claim 4, characterized in that, The support column (5) has a two-section structure, one section is a threaded section (52) and the other section is a frustum section (51); the threaded section (52) is screwed and fixed in the internal thread groove (31) of the magnetic roller (3) to connect and fix the support column (5) and the magnetic roller (3); the frustum section (51) is rotatably connected to the support frame (6).

6. The magnetorheological damper based rotor vibration mitigation structure according to claim 5, wherein The end of the frustum section (51) is rotatably disposed in the annular cavity (61) of the support frame (6), and the outer ring of the end of the frustum section (51) located in the annular cavity (61) has a plurality of balls (62).

7. The magnetorheological damper based rotor vibration mitigation structure according to claim 6, wherein The radial buffer (64) includes a sliding column (641) connected to the inner wall of the magnetic ring (2). The other end of the sliding column (641) slides axially and coaxially into the sliding sleeve (642). The sliding sleeve (642) is fixedly installed in the support groove (63) of the outer ring of the support frame (6). The radial buffer (64) also includes a buffer spring (643), which is sleeved on the sliding column (641) and the sliding sleeve (642).

8. The magnetorheological damper based rotor vibration mitigation structure according to claim 7, wherein One end of the buffer spring (643) is connected to the inner wall of the magnetic ring (2), and the other end of the buffer spring (643) is connected to the bottom wall of the support groove (63).

9. The magnetorheological damper based rotor vibration mitigation structure according to claim 8, wherein, The outer surface of the coil bobbin (4) is connected to the inner wall of the magnetic ring (2) by an adhesive fixing layer (7).

10. The rotor vibration reduction structure based on a magnetorheological damper according to claim 9, characterized in that, A sealing ring sleeve (8) is embedded between the end of the magnetic ring (2) and the rotor shaft (1).

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