A vibration absorber for suppressing torsional vibrations of a rotor

Abstract

The present application relates to a kind of vibration absorber for inhibiting rotor torsional vibration, including vibration absorber mass, damping element and shafting element, the vibration absorber mass is circumferentially arranged along shafting element, sealed in the inside of damping element, and shafting element is interference fit with shaft section;Vibration absorber mass and damping element are provided with permanent magnet, and relative displacement is generated between damping element and vibration absorber mass by the relative rotation of permanent magnet, and the transfer of rotor torsional vibration to vibration absorber is realized.The present application utilizes mechanical structure to convert the torsional vibration of rotor into the rotational displacement of vibration absorber mass, and the torsional vibration force is converted into magnetic force by the force transmission mode between permanent magnets, which provides a solution for inhibiting the torsional vibration of rotating machinery and proposes a new idea for improving the precision and reliability of machinery.

Description

Technical Field

[0001] This invention belongs to the field of vibration control technology, and particularly relates to a vibration absorber for suppressing rotor torsional vibration, used to suppress torsional vibration of core components of rotating machinery. Background Technology

[0002] With the continuous advancement of mechanical modernization, the requirements for vibration in various fields are constantly increasing. Torsional vibration is a fundamental form of vibration in rotating machinery shaft systems. It is caused by changes in torque from external or internal sources during shaft rotation, such as driving torque or alternating load torque variations. In recent years, due to the widespread application of variable frequency motors, on the one hand, frequency converters generate a large amount of harmonic excitation; on the other hand, changes in speed make the operating speed easily approach the torsional critical speed, thus leading to faults and accidents caused by torsional vibration.

[0003] Torsional vibration subjectes shafts to alternating stress, which, with the accumulation of fatigue, can lead to sudden shaft breakage. Torsional vibration has a low natural frequency, making it prone to resonance. This can cause significant noise and accelerated wear of other parts, or even severe mechanical damage such as shaft breakage. Installing torsional vibration dampers on the shaft system is the primary measure for controlling shaft torsional vibration.

[0004] Vibration damping technology involves adding a subsystem to the main structure. When a dynamic load acts on the main structure and causes vibration, the main structure drives the subsystem to move together. However, during the movement of the subsystem, a force opposite to the direction of the main structure's motion is applied to the main structure, thereby reducing the dynamic response of the main structure. The most commonly used is the tuned mass damper, which typically consists of three parts: a spring, a moving mass, and a damping element. As a commonly used damper, there are many types, including rubber dampers, liquid viscous dampers, and magnetic dampers. However, in current torsional vibration absorbers, some passive dampers lack a damping unit, resulting in limited reduction of the amplitude of the newly generated resonance peak of the main structure; some absorbers use a rubber ring as a coupling element between the elastic element and the damping element, and the continuous rubber shape somewhat inhibits the kinetic energy transfer function of the moving mass of the absorber; some actively controlled torsional vibration absorbers also require supporting control equipment and systems, making their structure complex. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a vibration absorber for suppressing rotor torsional vibration. It utilizes a mechanical structure to convert the rotor's torsional vibration into the rotational displacement of the absorber's mass, and converts the torsional vibration force into magnetic force through the force transmission between permanent magnets. This provides a solution for suppressing torsional vibration in rotating machinery and offers a new approach to improving the precision and reliability of machinery.

[0006] A vibration absorber for suppressing rotor torsional vibration includes a vibration absorber mass, a damping element, and a shaft system element. The vibration absorber mass is arranged circumferentially along the shaft system element and sealed inside the damping element. The shaft system element is interference-fitted with the shaft segment. Permanent magnets are provided on the vibration absorber mass and the damping element. Through the relative rotation of the permanent magnets, a relative displacement is generated between the damping element and the vibration absorber mass, thereby transferring the rotor torsional vibration to the vibration absorber.

[0007] The vibration absorber mass includes a composite vibration-absorbing mass, which is a ring-shaped structural component with a width. Multiple protrusions are evenly distributed on the inner side of the ring-shaped component. Support pins II are connected to the protrusions, and support pins III are connected to the annular portion between two protrusions. Support pins I are connected to the shaft element, corresponding to support pins III. Support pins I and II are connected by a weak stiffness spring I, and support pins I and III are connected by a weak stiffness spring II. Permanent magnets I are embedded on the outer side of the vibration-absorbing mass at positions corresponding to the four protrusions.

[0008] The support pins II and III are evenly distributed along the circumference of the vibration-absorbing mass.

[0009] The permanent magnet I is connected to the vibration-absorbing mass by adhesive bonding.

[0010] Support pin I, support pin II, and support pin III are all spring support pins, wherein support pin I is a three-headed spring support pin, support pin II is a two-headed spring support pin, and support pin III is a single-headed spring support pin.

[0011] The support pin I is connected to the shaft element by a threaded connection, the support pin II is connected to the protruding part of the vibration-absorbing mass by a threaded connection, and the support pin III is connected to the annular part between the protrusion by a threaded connection.

[0012] The damping element is a sealed box type, including a damping box body and a damping cover plate, with the damping cover plate fixed to the damping box body; a coaxial through hole is opened in the middle of the damping box body and the damping cover plate for connection with the shaft segment; a permanent magnet II is embedded in the inner side wall of the damping box body, corresponding to the position of permanent magnet I, and the polarities of the two magnets repel each other.

[0013] The damping housing and damping cover plate are connected by an interference fit through through holes to ensure that the housing moves synchronously with the shaft section.

[0014] The permanent magnet II is mounted on the inner wall of the damping box by adhesive bonding.

[0015] The beneficial effects of this invention are:

[0016] 1. The shaft system and vibration-absorbing mass in this invention have a compact mechanical structure, ensuring that the device can function perfectly in a small space.

[0017] 2. The permanent magnets on the vibration-absorbing mass in this invention are fixed by adhesive bonding, which further compresses the size of the vibration absorber.

[0018] 3. When the permanent magnet I and permanent magnet II in this invention are not in use, they play a role in strengthening the vibration absorption mass and the fit of the shaft components.

[0019] 4. For the overall structure, the sealed box-type damping element provides protection, ensuring that the entire vibration absorber is in a relatively sealed environment.

[0020] 5. The entire device can suppress undesirable torsional vibrations. The vibration absorber has a compact structure and good vibration reduction effect, which can ensure stable operation in various environments. Attached Figure Description

[0021] Figure 1 A front view of the vibration absorber for suppressing rotor torsional vibration provided by the present invention;

[0022] Figure 2 This is a schematic diagram of a shaft system element with a vibration damper mass in this invention;

[0023] Figure 3 for Figure 2 The left view (with partial sectioning above the horizontal center line);

[0024] Figure 4 This is a schematic diagram of the damping element in this invention;

[0025] Figure 5 for Figure 4 The left view;

[0026] in,

[0027] 1. Vibration absorber mass with shaft system element, 1-1 Shaft system element, 1-2 Support pin I, 1-3 Weak stiffness spring I, 1-4 Support pin II, 1-5 Vibration absorber mass, 1-6 Weak stiffness spring II, 1-7 Support pin III, 1-8 Permanent magnet I, 2 Damping element, 2-1 Damping housing, 2-2 Fixing screw, 2-3 Damping cover plate, 2-4 Permanent magnet II. Detailed Implementation

[0028] To better explain and facilitate understanding of the present invention, the technical solution and effects of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1As shown, a vibration absorber for suppressing rotor torsional vibration includes a vibration absorber mass, a damping element 2, and a shaft element 1-1. The vibration absorber mass is arranged circumferentially along the shaft element 1-1 and sealed inside the damping element 2. The vibration absorber mass 1 with the shaft element is as follows: Figure 1 As shown; shaft element 1-1 is interference-fitted with the shaft section to ensure that the vibration absorber rotates synchronously with the shaft system.

[0030] like Figure 2-3 As shown, the vibration absorber mass includes a composite vibration absorber mass 1-5, which is a ring-shaped structural component with a width. Four protrusions are evenly distributed inwards on the inner surface of the ring-shaped component. Support pins II 1-4 are connected to the protrusions and are evenly distributed around the circumference of the vibration absorber mass 1-5. Support pins III 1-7 are connected to the annular portion between two protrusions and are evenly distributed around the circumference of the vibration absorber mass 1-5. Support pins I1-2 are connected to the shaft element 1-1 and are evenly distributed around the circumference of the vibration absorber mass 1-5, corresponding to support pins III 1-7. Support pins I1-2 and II 1-4 are connected by a weak stiffness spring I1-3, and support pins I1-2 and III 1-7 are connected by a weak stiffness spring II 1-6. Through these spring connections, the shaft element 1-1 is connected by the weak stiffness springs I1-3 and II 1-6. 1-6 is matched with the vibration-absorbing mass 1-5. Permanent magnets I1-8 are embedded in the four protrusions on the outer surface of the vibration-absorbing mass 1-5, and the permanent magnets I1-8 are connected to the vibration-absorbing mass 1-5 by adhesive bonding.

[0031] Based on the spring connection method, the support pins I1-2, II 1-4 and III 1-7 are all spring support pins, wherein support pin I1-2 is a three-headed spring support pin, support pin II 1-4 is a double-headed spring support pin, and support pin III 1-7 is a single-headed spring support pin.

[0032] The support pin I1-2 is connected to the shaft element 1-1 by a threaded connection, the support pin II 1-4 is connected to the protruding part of the vibration-absorbing mass 1-5 by a threaded connection, and the support pin III 1-7 is connected to the annular part between the protrusions by a threaded connection, which makes the structure compact and increases its structural rigidity.

[0033] The shaft element 1-1 and the vibration-absorbing mass 1-5 are closely matched and interconnected to further reduce the volume, making the overall vibration absorber have a more compact structure and occupy less space.

[0034] To ensure a compact structure, the aforementioned composite vibration-absorbing mass 1-5 is used. The vibration-absorbing mass 1-5 and the shaft element 1-1 are connected by a support pin and a weak stiffness spring, which provides support for the installation of the permanent magnet.

[0035] like Figure 4-5 As shown, the damping element 2 is a sealed box type, which not only ensures the normal operation of the damping element 2, but also protects the internal vibration absorber and shaft system element 1-1. The damping element 2 includes a damping box 2-1 and a damping cover plate 2-3. The damping cover plate 2-3 is fixed to the damping box 2-1 by fixing screws 2-2. A coaxial through hole is opened in the middle of the damping box 2-1 and the damping cover plate 2-3 for connection with the shaft segment. An interference fit is used to ensure synchronous movement between the box and the shaft segment. A permanent magnet II2-4 is embedded in the inner wall of the damping box 2-1, corresponding to the position of the permanent magnet I1-8, and the two repel each other. The permanent magnet II2-4 is glued to the inner wall of the damping box 2-1. The damping element 2 achieves a damping effect through the interaction force generated between the magnets. For traditional mechanical structures, the use of permanent magnets will further make the structure more compact.

[0036] The purpose of this invention is to suppress undesirable torsional vibrations of the rotor, combined with Figure 1 As can be seen, the present invention utilizes the characteristics of permanent magnets, and is equipped with permanent magnet II2-4 and permanent magnet I1-8. When there is relative motion between permanent magnet II2-4 and permanent magnet I1-8, a force that resists this relative motion will be generated. The larger the small displacement generated, the greater the resistance generated.

[0037] The working principle of the above-mentioned vibration absorber for suppressing rotor torsional vibration is as follows:

[0038] When suppressing rotor torsional vibration, after the rotor system generates torsional vibration, the shaft section transmits the torsional vibration to the vibration-absorbing mass 1-5 through the shaft element 1-1 and the weak stiffness spring, forcing the vibration-absorbing mass 1-5 to produce a small displacement. Furthermore, the permanent magnet I1-8, which is further bonded to the vibration-absorbing mass 1-5, will produce a displacement relative to the permanent magnet II2-4 in the damping box 2-1, realizing the transfer of rotor torsional vibration to the vibration absorber, thereby playing the role of magnetic damping, and the vibration absorber plays the role of vibration absorption.

[0039] The specific work process is as follows:

[0040] When the rotor system rotates, the system generates torsional vibration. This torsional vibration is transmitted to the vibration-absorbing mass 1-5 through the shaft element 1-1, which is interference-fitted with the shaft section, and the weak stiffness springs I1-3 and II 1-6. Furthermore, the vibration-absorbing mass 1-5 drives the four permanent magnets I1-8 to generate relative displacement. This results in relative displacement between the damping element 2 of the vibration absorber and the vibration-absorbing mass, thus transferring the rotor's torsional vibration to the vibration absorber, which then plays a vibration-absorbing role.

[0041] Vibration is one of the important factors affecting mechanical precision and must be given sufficient attention. Nowadays, most miniature rotating machinery requires good dynamic characteristics. This invention can play a certain role in making up for the shortcomings of current vibration suppression technology.

Claims

1. A vibration absorber for suppressing rotor torsional vibration, characterized in that: It includes a vibration absorber mass, a damping element, and a shaft system element. The vibration absorber mass is arranged circumferentially along the shaft system element and sealed inside the damping element. The shaft system element is interference-fitted with the shaft section. Permanent magnets are provided on the vibration absorber mass and the damping element. Through the relative rotation of the permanent magnets, a relative displacement is generated between the damping element and the vibration absorber mass, thereby realizing the transfer of rotor torsional vibration to the vibration absorber. The vibration absorber mass includes a composite vibration-absorbing mass, which is a ring-shaped structural component with a width. Multiple protrusions are evenly distributed on the inner side of the ring-shaped component. Support pins II are connected to the protrusions, and support pins III are connected to the annular portion between two protrusions. Support pins I are connected to the shaft element, corresponding to support pins III. Support pins I and II are connected by a weak stiffness spring I, and support pins I and III are connected by a weak stiffness spring II. Permanent magnets I are embedded on the outer side of the vibration-absorbing mass at positions corresponding to the four protrusions.

2. The vibration absorber for suppressing rotor torsional vibration according to claim 1, characterized in that: The support pins II and III are evenly distributed along the circumference of the vibration-absorbing mass.

3. A vibration absorber for suppressing rotor torsional vibration according to claim 1, characterized in that: The permanent magnet I is connected to the vibration-absorbing mass by adhesive bonding.

4. A vibration absorber for suppressing rotor torsional vibration according to claim 1, characterized in that: Support pin I, support pin II, and support pin III are all spring support pins, wherein support pin I is a three-headed spring support pin, support pin II is a two-headed spring support pin, and support pin III is a single-headed spring support pin.

5. A vibration absorber for suppressing rotor torsional vibration according to claim 1, characterized in that: The support pin I is connected to the shaft element by a threaded connection, the support pin II is connected to the protruding part of the vibration-absorbing mass by a threaded connection, and the support pin III is connected to the annular part between the protrusion by a threaded connection.

6. A vibration absorber for suppressing rotor torsional vibration according to claim 1, characterized in that: The damping element is a sealed box type, including a damping box body and a damping cover plate, with the damping cover plate fixed to the damping box body; a coaxial through hole is opened in the middle of the damping box body and the damping cover plate for connection with the shaft segment; a permanent magnet II is embedded in the inner side wall of the damping box body, corresponding to the position of permanent magnet I, and the polarities of the two magnets repel each other.

7. A vibration absorber for suppressing rotor torsional vibration according to claim 6, characterized in that: The damping housing and damping cover plate are connected by an interference fit through through holes to ensure that the housing moves synchronously with the shaft section.

8. A vibration absorber for suppressing rotor torsional vibration according to claim 6, characterized in that: The permanent magnet II is mounted on the inner wall of the damping box by adhesive bonding.

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