High-stability bearing seat based on elastic buffering

Abstract

The invention provides a high-stability bearing seat based on elastic buffering, the axis of the high-stability bearing seat is in the vertical direction after installation, the high-stability bearing seat comprises a seat body, an annular cavity is formed in the seat body, a plurality of fan-shaped damping units which are evenly arranged in the circumferential direction are arranged in the annular cavity, and the fan-shaped damping units are filled with magnetorheological fluid. Each fan-shaped damping unit comprises an outer cavity and an inner cavity which are sequentially arranged from outside to inside in the radial direction, the outer cavities and the inner cavities are connected through radial straight-through flow channels, a plurality of honeycomb hole plates are arranged in the inner cavities, and honeycomb holes of the honeycomb hole plates are staggered in the radial direction so that labyrinth flow channels can be formed in the inner cavities. A connecting pipe is arranged between every two adjacent fan-shaped damping units so that a circumferential straight-through flow channel can be formed between the fan-shaped damping units, the inner side wall and the outer side wall of each fan-shaped damping unit have the micro-deformation capacity, the preset pre-deformation amount of the outer side wall is larger than that of the inner side wall, and the yield strength of the inner side wall is larger than that of the outer side wall.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing seats, and particularly to a highly stable bearing seat based on elastic buffering. Background Art

[0002] The bearing seat is an indispensable core component in the mechanical transmission system. Its main function is to support and fix the bearing to ensure the precise alignment and stable operation of the rotating shaft system under complex working conditions. As a key carrier connecting the bearing and the equipment structure, the bearing seat directly affects the service life and operation efficiency of the equipment by reasonably distributing loads, absorbing vibration energy, providing sealing protection, etc. Traditional bearing seats are mostly made of materials such as cast iron, cast steel, or aluminum alloy, and are structurally divided into two categories: split type and integral type, corresponding to the installation requirements of different bearing types (such as rolling bearings, sliding bearings). With the development of modern industry towards high speed, heavy load, and intelligentization, the design of bearing seats not only needs to meet the basic load-bearing requirements but also needs to have dynamic response capabilities to cope with challenges such as impact loads and variable-condition vibrations.

[0003] The current shock absorption design of bearing seats mainly realizes the dissipation and isolation of vibration energy through two types of technologies: passive damping and active control. Passive damping relies on material or structural characteristics to achieve energy conversion. For example, elastic material buffering, hydraulic damping buffering, and mechanical spring buffering. Active control adjusts the damping characteristics in real time based on sensor feedback. For example, an electromagnetic actuator can counteract vibrations through electromagnetic force in the opposite direction.

[0004] However, the performance shortcomings of traditional bearing seats in dynamic working conditions are mainly reflected in the rigid response of the fixed damping characteristics and the local limitations of the active system. The parameters of the passive damping system are solidified during the manufacturing stage and are difficult to adaptively adjust in the face of rotational speed fluctuations, load mutations, or multi-frequency coupled vibrations. Active control technologies are mostly designed for single degrees of freedom or narrow frequency bands and cannot coordinate the synergistic effects of multiple groups of damping units in three-dimensional space. For example, although an electromagnetic actuator can respond quickly, its discrete layout is likely to cause uneven force fields, exacerbating eccentric wear of the shaft system. Summary of the Invention

[0005] The present invention aims to solve the above technical problems and provides a highly stable bearing seat based on elastic buffering.

[0006] The technical solution of the present invention is a highly stable bearing seat based on elastic buffering. After installation, the axis is along the vertical direction. It includes a seat body, and an annular cavity is provided in the seat body. A number of sector damping units are arranged circumferentially and evenly in the annular cavity. The sector damping units are filled with magnetorheological fluid. The sector damping unit includes an outer cavity and an inner cavity arranged in sequence from outside to inside along the radial direction. The outer cavity and the inner cavity are connected by a radial through-flow channel. A number of honeycomb hole plates are provided in the inner cavity. The honeycomb holes of each honeycomb hole plate are staggered along the radial direction so that the inner cavity forms a labyrinth flow channel. A connecting pipe is provided between adjacent sector damping units so that a circumferential through-flow channel is formed between the sector damping units. The inner and outer side walls of the sector damping unit both have the ability of micro-deformation, and the preset pre-deformation amount of the outer side wall is greater than that of the inner side wall, and the yield strength of the inner side wall is greater than that of the outer side wall;

[0007] An axial main control coil is provided at the bottom of each sector damping unit. The magnetic field direction of the axial main control coil is along the vertical direction. A radial compensation coil is provided between adjacent sector damping units. The magnetic field direction of the radial compensation coil is along the radial direction. A tangential stability coil is provided on the outer side of each sector damping unit. The magnetic field direction of the tangential stability coil is around the tangent direction of the axis. A three-axis vibration sensor is provided on the flange surface of the seat body. A magnetic flux density sensor is provided in the inner cavity. The current ratio of the axial main control coil, the radial compensation coil, and the tangential stability coil is dynamically adjusted according to the vibration spectrum and magnetic field distribution detected in real time.

[0008] As an implementation manner, the magnetorheological fluid includes a base fluid and magnetic particles. The base fluid is synthetic hydrocarbon oil, the magnetic particles are carbonyl iron powder, and the carbonyl iron powder accounts for 40% of the total weight of the magnetorheological fluid.

[0009] As an implementation manner, the synthetic hydrocarbon oil is at least one of hydrogenated polyalphaolefin, alkylated cyclopentane or isomerized alkane.

[0010] As an implementation manner, the sector damping unit is set to 6 groups, and a heat conduction gap is provided between adjacent two groups of sector damping units.

[0011] As an implementation manner, the heat conduction gap is filled with a graphene-enhanced silicone grease composite material. Jagged heat dissipation fins are provided on both sides of the heat conduction gap, and the graphene-enhanced silicone grease composite material is filled between the heat dissipation fins.

[0012] As an implementation manner, the inner side wall of the sector damping unit is made of elastic alloy material, and the outer side wall of the sector damping unit is made of composite elastomer material.

[0013] As an implementation manner, the axial main control coil is wound with a copper-aluminum alloy wire. The cross-section of the wire is a rectangular flat structure. A nano-aluminum oxide insulating coating is provided between winding layers, and a spiral cooling channel is embedded in the coil.

[0014] As an implementation manner, the radial dislocation amount of the honeycomb orifice plate is 1 / 3 to 1 / 2 of its honeycomb aperture, and the distance between two adjacent honeycomb orifice plates is 3 - 5 mm.

[0015] The beneficial effects of the present invention compared with the prior art are as follows: for this high-stability bearing seat based on elastic buffering, by setting passive damping that consumes energy through the flow channel structure and active damping that adjusts the viscosity of the magnetorheological fluid to change the shear stress in the flow channel, a dynamic damping matrix with closed-loop control is formed. When the passive damping is enabled, the maze flow channel effect formed by several honeycomb orifice plates forces the fluid to make multiple turns. Each turn generates local turbulence, dissipating energy. When the active damping is enabled, the current of the axial main control coil increases, generating a basic magnetic field in the vertical direction to ensure that the magnetorheological fluid maintains its basic viscosity. The current of the radial compensation coil is a pulsed transient current, generating a local magnetic field to form a viscosity difference-driven flow. The tangential stability coil maintains the basic current to suppress the eddy current caused by the rotation of the fluid. The passive damping presets the flow path of the magnetorheological fluid through the flow channel structure, and the active damping induces the fluid to migrate to the high-shear region through the viscosity gradient. The two constitute a hybrid damping system inside the bearing seat, ultimately greatly improving the vibration attenuation rate of the bearing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the high-stability bearing seat based on elastic buffering provided by an implementation manner of the present invention;

[0017] Figure 2 is a partial cross-sectional view of the high-stability bearing seat based on elastic buffering provided by an implementation manner of the present invention.

[0018] In the figure: 1, seat body; 2, annular cavity; 3, sector damping unit; 5, outer cavity; 6, inner cavity; 7, radial through-flow channel; 8, honeycomb orifice plate; 9, connecting pipe; 10, circumferential through-flow channel; 11, axial main control coil; 12, radial compensation coil; 13, tangential stability coil; 14, triaxial vibration sensor; 15, magnetic flux density sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following clearly and completely describes the above and other implementation manners and advantages of the present invention with reference to the accompanying drawings. Obviously, the described implementation manners are only partial implementation manners of the present invention, rather than all implementation manners.

[0020] In one implementation manner, as shown in Figure 1 and Figure 2 shown.

[0021] The high-stability bearing housing based on elastic buffering provided by this embodiment has its axis along the vertical direction after installation. It includes a housing body 1, in which an annular cavity 2 is formed. A number of sector damping units 3 are arranged circumferentially and evenly in the annular cavity 2. The sector damping units 3 are filled with magnetorheological fluid. The sector damping unit 3 includes an outer cavity 5 and an inner cavity 6 arranged in sequence from outside to inside along the radial direction. The outer cavity 5 and the inner cavity 6 are connected by a radial through-flow channel 7. A number of honeycomb hole plates 8 are arranged in the inner cavity 6. The honeycomb holes of each honeycomb hole plate 8 are staggered along the radial direction so that the inner cavity 6 forms a labyrinth flow channel. A connecting pipe 9 is arranged between adjacent sector damping units 3 so that a circumferential through-flow channel 10 is formed between the sector damping units 3. The inner and outer side walls of the sector damping unit 3 both have the ability of micro-deformation, and the preset pre-deformation amount of the outer side wall is greater than that of the inner side wall, and the yield strength of the inner side wall is greater than that of the outer side wall. An axial main control coil 11 is arranged at the bottom of each sector damping unit 3, and the magnetic field direction of the axial main control coil 11 is along the vertical direction. A radial compensation coil 12 is arranged between adjacent sector damping units 3, and the magnetic field direction of the radial compensation coil 12 is along the radial direction. A tangential stability coil 13 is arranged on the outer side of each sector damping unit 3, and the magnetic field direction of the tangential stability coil 13 is around the tangent direction of the axis. A three-axis vibration sensor 14 is arranged on the flange surface of the housing body 1, and a magnetic flux density sensor 15 is arranged in the inner cavity 6. The current ratio of the axial main control coil 11, the radial compensation coil 12, and the tangential stability coil 13 is dynamically adjusted according to the vibration spectrum and magnetic field distribution detected in real time.

[0022] In this embodiment, for the high-stability bearing housing based on elastic buffering, in order to improve the performance short board of the traditional bearing housing under dynamic working conditions, passive damping that consumes energy through the flow channel structure and active damping that adjusts the viscosity of the magnetorheological fluid by an electromagnetic coil to change the shear stress in the flow channel are set, so as to form a dynamic damping matrix with closed-loop control.

[0023] In this embodiment, the axis of the high-stability bearing housing based on elastic buffering is along the vertical direction after installation. A three-axis vibration sensor 14 is arranged on the flange surface of its housing body 1 to monitor the vibration spectrum in real time. For example, when the bearing housing is subjected to a radial impact load, the passive damping starts first. Due to the larger preset pre-deformation amount and lower yield strength of the outer side wall, the outer side wall of the sector unit first generates a radial compressive deformation, resulting in a 15-20% reduction in the volume of the outer cavity 5. The magnetorheological fluid in the pressurized outer cavity 5 rushes into the inner cavity 6 at a high speed through the radial through-flow channel 7. At this time, the labyrinth flow channel effect forces the fluid to turn multiple times, and local turbulence is generated each time it turns, dissipating energy. When the impact pressure exceeds the set threshold, the circumferential through-flow channel 10 is opened through the connecting pipe 9 to divert part of the fluid to adjacent units.

[0024] In this embodiment, when the triaxial vibration sensor 14 detects that the main frequency of the radial vibration reaches the set resonance frequency range, and the magnetic flux density sensor 15 detects that the magnetic field intensity at the inlet of the honeycomb flow channel drops below the magnetic field intensity required to maintain the standard working condition, the active damping is activated. The current of the axial main control coil 11 increases to generate a basic magnetic field in the vertical direction to ensure that the magnetorheological fluid maintains the basic viscosity. The current of the radial compensation coil 12 is a pulsed transient current to generate a local magnetic field to form a viscosity difference-driven flow. The current of the tangential stabilization coil 13 maintains a basic current of 0.6 A to suppress the eddy current caused by the rotation of the fluid. Thus, a dynamic damping matrix is formed, that is, based on the sensor feedback, through the dynamic adjustment of the three-dimensional electromagnetic field, precise reinforcement is instantaneously completed, and the shear stress in the key area (such as the quadrant corresponding to the resonance frequency) is targeted to be improved.

[0025] In this embodiment, the passive damping presets the flow path of the magnetorheological fluid through the flow channel structure, and the active damping induces the fluid to migrate to the high-shear zone by using the viscosity gradient on this flow path. The two constitute a hybrid damping system in the bearing housing, and finally greatly improve the vibration attenuation rate of the bearing housing.

[0026] In one embodiment, the magnetorheological fluid of the highly stable bearing housing based on elastic buffering includes a base fluid and magnetic particles. The base fluid is synthetic hydrocarbon oil, the magnetic particles are carbonyl iron powder, and the carbonyl iron powder accounts for 40% of the total weight of the magnetorheological fluid.

[0027] In this embodiment, the base fluid uses synthetic hydrocarbon oil, preferably a model with a kinematic viscosity of 20 - 35 cSt at 40 °C, having excellent high and low temperature stability (-50 °C to 180 °C) and antioxidant properties. The magnetic particles are spherical carbonyl iron powder with a particle size distribution of 5 - 15 μm, and the proportion is strictly controlled at 40% of the total weight. Under this ratio, the viscosity of the magnetorheological fluid at zero magnetic field is only 120 mPa·s, and the yield stress can reach 85 kPa after applying a 1 T magnetic field, achieving a viscosity adjustment range of more than 100 times, while avoiding particle sedimentation.

[0028] In one embodiment, the synthetic hydrocarbon oil of the highly stable bearing housing based on elastic buffering is at least one of hydrogenated polyalphaolefin, alkylated cyclopentane, or isomerized alkane.

[0029] In this embodiment, the molecular weight of the hydrogenated polyalphaolefin is 600 - 800, which is suitable for extremely low temperature environments. The alkylated cyclopentane meets the high temperature explosion-proof requirements. The isomerized alkane is used for wide temperature range working conditions. In the preferred embodiment, when the ratio of the hydrogenated polyalphaolefin and the isomerized alkane is 7:3, the viscosity of the magnetorheological fluid at -40 °C does not exceed 500 mPa·s, and there is no coking at 150 °C high temperature.

[0030] In one embodiment, six sets of sector damping units 3 of the highly stable bearing seat based on elastic buffering are provided, and a heat conduction gap is provided between two adjacent sets of sector damping units 3.

[0031] In this embodiment, six sets of sector damping units 3 are circumferentially and uniformly arranged, each unit occupying an arc length of 60°, and a 5-mm heat conduction gap is provided between adjacent units. The six-unit layout reduces the pressure fluctuation to 1 / 3 of that of the traditional four-unit scheme, and at the same time, the heat conduction gap controls the temperature rise.

[0032] In a preferred embodiment, when the axis of the highly stable bearing seat based on elastic buffering is along the horizontal direction after installation, asymmetric mechanics can be used to match the sector damping units 3. Taking the clock as an example, the height of the sector damping unit 3 at the 12 o'clock direction is 15% higher than that of the sector damping unit 3 at the 6 o'clock direction to adapt to the actual load distribution of the bearing seat.

[0033] In one embodiment, for the highly stable bearing seat based on elastic buffering, a graphene-enhanced silicone grease composite material is filled in the heat conduction gap, and staggered serrated heat dissipation fins are provided on both sides of the heat conduction gap, and the graphene-enhanced silicone grease composite material is filled between the heat dissipation fins.

[0034] In this embodiment, the filling material is selected as the graphene-enhanced silicone grease composite material containing 2-5 wt% graphene flakes, and the thermal conductivity reaches 8.5 W / (m·K). Staggered serrated fins are provided on both sides of the gap as a heat dissipation structure. The roots of the fins are laser welded to the outer shell of the sector damping unit 3, and a 0.1-mm thermal expansion gap is reserved at the top.

[0035] In one embodiment, for the highly stable bearing seat based on elastic buffering, the inner side wall of the sector damping unit 3 is made of an elastic alloy material, and the outer side wall of the sector damping unit 3 is made of a composite elastomer material.

[0036] In this embodiment, the inner side wall of the sector damping unit 3 is made of Ti-6Al-4V elastic alloy with a thickness of 2.0 mm, a yield strength of ≥800 MPa, and can bear more than 80% of the main load. The outer side wall of the sector damping unit 3 is made of a polyurethane / carbon nanotube composite elastomer with a preset pre-strain of 0.5%. In this embodiment, the outer side wall deforms before the inner side wall (the deformation ratio is 3:1), guiding more than 80% of the impact fluid into the labyrinth flow channel.

[0037] In one embodiment, for the highly stable bearing seat based on elastic buffering, the axial main control coil 11 is wound with a copper-aluminum alloy wire, the cross-section of the wire is a rectangular flat structure, a nano-aluminum oxide insulating coating is provided between the winding layers, and a spiral cooling channel is embedded in the coil.

[0038] In this embodiment, a wire with a rectangular cross-section is adopted, which can increase the current-carrying capacity. A nano-alumina coating with a thickness of 50-80 nm is coated between layers for insulation treatment. In addition, a spiral stainless-steel cooling pipe with a diameter of 1.5 mm is embedded. When the water flow rate reaches 0.5 L / min, 85% of the Joule heat can be removed.

[0039] In one embodiment, for the highly stable bearing seat based on elastic buffering, the radial misalignment of the honeycomb hole plate 8 is 1 / 3 to 1 / 2 of its honeycomb hole diameter, and the distance between two adjacent honeycomb hole plates 8 is 3-5 mm.

[0040] In this embodiment, the radial misalignment of adjacent hole plates is 1 / 3-1 / 2 of the hole diameter, which can form a three-stage flow channel. The distance between the hole plates is set to 3-5 mm. If it is too small, the flow resistance will be too large; if it is too large, the turbulence effect will be weakened.

[0041] The specific embodiments described above further elaborate on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. In particular, for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A highly stable bearing seat based on elastic buffering, with its axis along the vertical direction after installation, characterized in that, It includes a seat body, an annular cavity is provided in the seat body, a number of sector damping units are arranged circumferentially and uniformly in the annular cavity, the sector damping units are filled with magnetorheological fluid, the sector damping unit includes an outer cavity and an inner cavity arranged in sequence from outside to inside along the radial direction, the outer cavity and the inner cavity are connected by a radial through-flow channel, a number of honeycomb hole plates are provided in the inner cavity, and the honeycomb holes of each honeycomb hole plate are staggered along the radial direction so that the inner cavity forms a labyrinth flow channel. A connecting pipe is provided between each adjacent sector damping unit so that a circumferential through-flow channel is formed between the sector damping units. The inner and outer side walls of the sector damping unit both have the ability of micro-deformation, and the preset pre-deformation amount of the outer side wall is greater than that of the inner side wall, and the yield strength of the inner side wall is greater than that of the outer side wall; An axial main control coil is provided at the bottom of each sector damping unit, the magnetic field direction of the axial main control coil is along the vertical direction, a radial compensation coil is provided between each adjacent sector damping unit, the magnetic field direction of the radial compensation coil is along the radial direction, a tangential stability coil is provided on the outer side of each sector damping unit, the magnetic field direction of the tangential stability coil is around the tangent direction of the axis, a three-axis vibration sensor is provided on the flange surface of the seat body, and a magnetic flux density sensor is provided in the inner cavity. The current ratio of the axial main control coil, the radial compensation coil, and the tangential stability coil is dynamically adjusted according to the vibration spectrum and magnetic field distribution detected in real time.

2. The high-stability bearing seat based on elastic buffering according to claim 1, wherein The magnetorheological fluid includes a base fluid and magnetic particles, the base fluid is a synthetic hydrocarbon oil, the magnetic particles are carbonyl iron powder, and the carbonyl iron powder accounts for 40% of the total weight of the magnetorheological fluid.

3. The high-stability bearing housing based on elastic buffering according to claim 2, wherein The synthetic hydrocarbon oil is at least one of hydrogenated polyalphaolefin, alkylated cyclopentane or isomerized alkane.

4. The high-stability bearing seat based on elastic buffering according to claim 1, characterized in that, The sector damping units are set to 6 groups, and a heat conduction gap is provided between two adjacent groups of sector damping units.

5. The high-stability bearing housing based on elastic buffering according to claim 4, characterized in that, The heat conduction gap is filled with a graphene-enhanced silicone grease composite material, and serrated heat dissipation fins are provided on both sides of the heat conduction gap and are distributed in a staggered manner, and the graphene-enhanced silicone grease composite material is filled between the heat dissipation fins.

6. The high-stability bearing seat based on elastic buffering according to claim 1, wherein, The inner side wall of the sector damping unit is made of an elastic alloy material, and the outer side wall of the sector damping unit is made of a composite elastomer material.

7. The high-stability bearing seat based on elastic buffering according to claim 1, wherein The axial main control coil is wound with a copper-aluminum alloy wire, the cross-section of the wire is a rectangular flat structure, a nano-aluminum oxide insulating coating is provided between the winding layers, and a spiral cooling channel is embedded in the coil.

8. The high-stability bearing seat based on elastic buffering according to claim 1, wherein The radial misalignment amount of the honeycomb hole plate is 1 / 3 to 1 / 2 of its honeycomb hole diameter, and the distance between two adjacent honeycomb hole plates is 3-5 mm.

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