CN221237100U - A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration - Google Patents

Abstract

The utility model belongs to the technical field of vibration reduction of rotary machinery, and relates to a rotor vibration absorber with piecewise linear magnetic damping for inhibiting transverse vibration, which comprises a vibration absorber bearing ring sleeved outside a rotor rotating shaft, wherein a movable ring is arranged outside the vibration absorber bearing ring, and the vibration absorber bearing ring is connected with the movable ring through a spring; the outer side of the movable ring is provided with a permanent magnet bearing ring, and the inner side of the permanent magnet bearing ring is provided with a stepped permanent magnet ring group; an aluminum ring group is arranged on the outer side of the movable ring; the stepped permanent magnet ring group comprises a plurality of pairs of magnets, and the inner diameters and the thicknesses of the magnets at the corresponding positions of the head and the tail are the same; the aluminum ring group comprises a plurality of aluminum rings with the same number as the magnet pairs, and the outer diameters and the thicknesses of the aluminum rings at the corresponding positions of the head and the tail of the movable ring are the same. The utility model has a piecewise linear damping structure, and can effectively inhibit the bad vibration of the unbalanced rotor when in over resonance, and also has an improvement effect on the bad vibration of the rub-impact fault rotor through reasonably setting piecewise linear damping values.

Description

A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration

Technical Field

The utility model belongs to the technical field of rotary machinery vibration reduction, and in particular relates to a rotor vibration absorber with segmented linear magnetic damping for suppressing lateral vibration, which is used for suppressing lateral vibration of the rotor.

Background technique

Rotating machinery is everywhere in social production and life, playing a vital role in improving people's lives and promoting economic growth. The safe and stable operation of the rotor system, the core component of rotating machinery, is the basic guarantee for rotating machinery to meet the requirements of production and life.

The rotor system running at high speed inevitably has vibrations of varying degrees. For example, the rotor system must have mass imbalance, which causes the rotor system to produce lateral vibrations. In order to improve efficiency, rotating machinery is currently developing towards high speed and small rotor-stator gap, which increases the probability of violent vibrations due to imbalance, and may cause various faults such as rotor-stator friction due to the small rotor-stator gap, and aggravate the hazards of other faults. It can be seen that the vibration of the rotor system directly affects the stability of the equipment and threatens production safety. This problem becomes more prominent with the high speed and high efficiency of the rotor system. Therefore, the control and suppression of vibration is of great significance to maintaining the stability, efficiency and safety of modern rotor systems.

Vibration absorption technology includes three methods: passive, semi-active and active. It is an important measure in the field of vibration suppression and has also been studied in rotor vibration suppression. At present, active rotor vibration absorbers have high control accuracy and sensitive response, but they require an additional control system, have a complex structure and low applicability; passive rotor vibration absorbers have a simple structure but a narrow range of action. They are generally only suitable for suppressing vibrations caused by rotor imbalance. Moreover, the stiffness, damping and other parameters of passive vibration absorbers are relatively fixed and cannot adapt to the suppression of different vibrations of the rotor system caused by complex frequency excitation. Although semi-active rotor vibration absorbers have some advantages of active and passive rotor vibration absorbers (such as relatively simple device structure and relatively wide vibration suppression frequency range), they also need matching control devices. The existing patented devices can only suppress the vibration of mass unbalanced rotors, and have little effect on suppressing vibrations caused by other collision faults (such as friction faults).

Utility Model Content

In view of the shortcomings of the prior art, the utility model provides a rotor vibration absorber for suppressing lateral vibration with piecewise linear magnetic damping. The damping unit is a stepped magnetic structure with piecewise linear characteristics. Through the reasonable setting of the piecewise linear damping value, in addition to effectively suppressing the adverse vibration of the unbalanced rotor during over-resonance, it also has an improvement effect on the adverse vibration of the rotor with friction fault.

A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration comprises a vibration absorber bearing ring sleeved on the outside of a rotor shaft, a dynamic ring is arranged on the outside of the vibration absorber bearing ring, the vibration absorber bearing ring and the dynamic ring are connected by springs, a plurality of springs are evenly distributed along the circumference of the dynamic ring and are arranged at equal intervals along the axial direction of the vibration absorber bearing ring; a permanent magnet bearing ring is arranged on the outside of the dynamic ring and is fixedly connected to a casing or a foundation; a stepped permanent magnet ring group is installed on the inside of the permanent magnet bearing ring; an aluminum ring group is installed on the outside of the dynamic ring;

The stepped permanent magnet ring group includes a plurality of magnet pairs, each pair of magnet pairs has adjacent magnetic poles opposite to each other, the magnet outer diameters of the plurality of magnet pairs are the same, the inner diameters and thicknesses gradually decrease from the head and tail of the stepped permanent magnet ring group to the middle position, and the inner diameters and thicknesses of the magnets at corresponding positions at the head and tail of the stepped permanent magnet ring group are the same;

The aluminum ring group includes a plurality of aluminum circular rings having the same number as the magnet pairs, and each aluminum circular ring at a relative position is located between the two magnets of each pair of magnets; wherein the inner diameters of the plurality of aluminum circular rings are the same, the outer diameters gradually increase from the head and tail of the moving ring to the middle position, the thickness gradually decreases from the head and tail of the moving ring to the middle position, and the outer diameters and thicknesses of the aluminum circular rings at corresponding positions at the head and tail of the moving ring are the same.

The vibration absorber bearing ring is installed on the rotor shaft through a connecting bearing as a fixed frame. Hole shoulders are arranged on the inner sides of both ends of the vibration absorber bearing ring. The inner and outer rings of the connecting bearing cooperate with the rotor shaft and the vibration absorber bearing ring respectively, and are the medium for transmitting the rotor vibration to the vibration absorber.

The dynamic ring has four springs evenly distributed in the circumferential direction, and the vibration absorber bearing ring has four springs axially arranged in a matrix, with a total of 16 springs.

The stepped permanent magnet ring group includes five pairs of magnets.

The aluminum ring group includes five aluminum rings.

The beneficial effect of the utility model is that the utility model generates piecewise linear damping of different sizes according to different rotor vibration amplitudes through a stepped magnetic structure, so that the vibration suppression effect of the vibration absorber presents amplitude adaptability, and the damping with positive correlation to the amplitude enables the vibration absorber to play a better vibration suppression effect when the rotor vibration amplitude is small or large.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of a vibration absorber provided in Example 1 of the utility model;

FIG2 is a left side view of the vibration absorber provided in Example 1 of the utility model;

FIG3 is a schematic diagram of magnetic pole distribution in the utility model;

in,

A-permanent magnet bearing ring, B-stepped permanent magnet ring group, C-aluminum ring group, D-dynamic ring, E-spring, F-vibration absorber bearing ring, G-connecting bearing, H-rotor shaft.

Detailed ways

In order to better explain the present invention and facilitate understanding, the technical scheme and effects of the present invention are described in detail below through specific implementation modes in conjunction with the accompanying drawings.

Example 1

A rotor vibration absorber with segmented linear magnetic damping for suppressing lateral vibration comprises a vibration absorber bearing ring sleeved on the outside of the rotor shaft, the vibration absorber bearing ring is installed on the rotor shaft through a connecting bearing, and serves as a fixed frame. The inner sides of both ends of the vibration absorber bearing ring are provided with shoulder holes, and the inner and outer rings of the connecting bearings are respectively matched with the rotor shaft and the vibration absorber bearing ring, and are the medium for transmitting the rotor vibration to the vibration absorber. A dynamic ring is arranged on the outer side of the vibration absorber bearing ring, and the vibration absorber bearing ring is connected to the dynamic ring through springs. A plurality of springs are evenly distributed along the circumference of the dynamic ring and are arranged at equal intervals along the axial direction of the vibration absorber bearing ring; as shown in FIG1-2, in this embodiment, four springs are evenly distributed along the circumference of the dynamic ring, and four springs are arranged axially on the vibration absorber bearing ring, forming a matrix, with a total of 16 springs. A permanent magnet bearing ring is arranged on the outer side of the dynamic ring, which is fixed to the casing or foundation, and a stepped permanent magnet ring group is installed on the inner side of the permanent magnet bearing ring; an aluminum ring group is installed on the outer side of the dynamic ring, which constitutes the mass unit of the vibration absorber. The spring is the elastic energy storage unit of the vibration absorber, through which the rotor vibration is transmitted to the mass unit of the vibration absorber.

The stepped permanent magnet ring group includes five pairs of magnets, as shown in B1-B5 in FIG1, and the adjacent magnetic poles of each pair of magnets are opposite, as shown in FIG3. The outer diameters of the magnets of the five pairs of magnets are the same, and the inner diameters and thicknesses gradually decrease from the head and tail of the stepped permanent magnet ring group to the middle position, and the inner diameters and thicknesses of the magnets at the corresponding positions at the head and tail of the stepped permanent magnet ring group are the same, that is, in this embodiment, the inner diameters and magnet thicknesses of the magnet pairs B1 and B5 are the same, the inner diameters and magnet thicknesses of the magnet pairs B2 and B4 are the same, and the inner diameter of B3 is the smallest.

The aluminum ring group includes five aluminum rings, and each aluminum ring in a relative position is located between the two magnets of each pair of magnets, as shown in C1-C5 in Figure 1. Among them, the inner diameters of the five aluminum rings are the same, the outer diameters gradually increase from the head and tail of the moving ring to the middle position, and the thickness gradually decreases from the head and tail of the moving ring to the middle position, and the outer diameters and thicknesses of the aluminum rings at the corresponding positions of the head and tail of the moving ring are the same, that is, in this embodiment, the outer diameters and thicknesses of C1 and C5 are the same, the outer diameters and thicknesses of C2 and C4 are the same, and the outer diameter of C3 is the largest and the thickness is the smallest. The aluminum ring group and the stepped permanent magnet ring group constitute the damping energy dissipation unit of the vibration absorber. The aluminum ring group cuts the magnetic flux lines in the stepped permanent magnet ring group due to vibration to generate magnetic damping. Due to the different diameters of the aluminum rings, according to the different vibration amplitudes of the rotor, the 5 groups of damping generate damping forces on the rotor in turn.

During installation, use a spring to connect the dynamic ring and the vibration absorber bearing ring, and install the aluminum ring group on the dynamic ring by welding or riveting; install a connecting bearing on the rotor shaft, use a bearing retaining ring to limit the axial freedom of the connecting bearing, and put the aluminum ring group, dynamic ring, spring, and vibration absorber bearing ring assembly on the rotor shaft. The hole shoulder on one side of the vibration absorber bearing ring cooperates with the connecting bearing, and then install a connecting bearing on the hole shoulder on the other side of the vibration absorber bearing ring, and also use a bearing retaining ring to limit its axial freedom. Install the permanent magnet bearing ring with magnet pair B1, B2 (or B4, B5) and one magnet of magnet pair B3 on the casing or foundation, and then install B4, B5 (or B1, B2) and the other magnet of magnet pair B3 on the permanent magnet bearing ring, and the vibration absorber installation is completed.

The vibration absorber is connected to the rotor shaft through the vibration absorber bearing ring and the connecting bearing. When the rotor amplitude is different, the aluminum rings with different outer diameters can sequentially shear the magnetic flux lines in the magnet pair to produce segmented damping, thereby suppressing the undesirable vibrations of different amplitudes caused by unbalance and friction faults, thereby ensuring the reduction of unbalance fault vibrations while also ensuring the safety of the rotor system under friction faults. The working principle of the above-mentioned rotor vibration absorber with segmented linear magnetic damping is:

The vibration of the rotor shaft H is transmitted to the absorber bearing ring F through the connecting bearing G, and further to the spring E. After the spring E is compressed or stretched, the force is transmitted to the dynamic ring D, and the dynamic ring D moves. Since the aluminum ring group C and the dynamic ring D are fixed together, the aluminum ring group C will vibrate with the dynamic ring D. Furthermore, each aluminum ring in the aluminum ring group C cuts the magnetic flux lines of the corresponding magnetic flux pairs in the stepped permanent magnet ring group B fixed on the permanent magnet bearing ring A, and the damping force generated reacts on each aluminum ring in the aluminum ring group C. When the amplitude of the rotor shaft H is not large, which is only affected by a small unbalanced force, only the aluminum ring C3 and the magnet pair B3 cut the magnetic flux lines, generating damping force; when the rotor has a large vibration due to a friction fault or a large unbalanced force, the aluminum rings C2 (C4) and C1 (C5) cut the magnetic flux lines with the corresponding magnet pairs, generating a larger damping force, thereby suppressing the excessive vibration of the rotor.

Claims (5)

1. A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration, characterized in that: it comprises a vibration absorber bearing ring sleeved on the outside of the rotor shaft, a dynamic ring is arranged on the outside of the vibration absorber bearing ring, the vibration absorber bearing ring and the dynamic ring are connected by springs, a plurality of springs are evenly distributed along the circumference of the dynamic ring and are arranged at equal intervals along the axial direction of the vibration absorber bearing ring; a permanent magnet bearing ring is arranged on the outside of the dynamic ring, which is fixed to the casing or the foundation; a stepped permanent magnet ring group is installed on the inside of the permanent magnet bearing ring; an aluminum ring group is installed on the outside of the dynamic ring; The stepped permanent magnet ring group includes a plurality of magnet pairs, each pair of magnet pairs has adjacent magnetic poles opposite to each other, the magnet outer diameters of the plurality of magnet pairs are the same, the inner diameters and thicknesses gradually decrease from the head and tail of the stepped permanent magnet ring group to the middle position, and the inner diameters and thicknesses of the magnets at corresponding positions at the head and tail of the stepped permanent magnet ring group are the same; The aluminum ring group includes a plurality of aluminum rings having the same number as the magnet pairs, and each aluminum ring at a relative position is located between the two magnets of each pair of magnets; wherein the inner diameters of the plurality of aluminum rings are the same, the outer diameters gradually increase from the head and tail of the moving ring to the middle position, the thickness gradually decreases from the head and tail of the moving ring to the middle position, and the outer diameters and thicknesses of the aluminum rings at corresponding positions at the head and tail of the moving ring are the same. 2. According to claim 1, a rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration is characterized in that: the vibration absorber bearing ring is installed on the rotor shaft through a connecting bearing as a fixed frame, and hole shoulders are provided on the inner sides of both ends of the vibration absorber bearing ring. The inner and outer rings of the connecting bearing are respectively matched with the rotor shaft and the vibration absorber bearing ring, which are the medium for transmitting the rotor vibration to the vibration absorber. 3. A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration according to claim 1, characterized in that: four springs are evenly distributed circumferentially on the dynamic ring, and four springs are axially arranged on the vibration absorber bearing ring in a matrix, with a total of 16 springs. 4. A rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration according to claim 1, characterized in that the stepped permanent magnet ring group includes five pairs of magnets. 5. The rotor vibration absorber with piecewise linear magnetic damping for suppressing lateral vibration according to claim 1, characterized in that: the aluminum ring group includes five aluminum rings.