Variable cross-section arched nonlinear vibration damping device for rotor system

Abstract

The present invention discloses a variable-section arch nonlinear vibration damping device for a rotor system, comprising a disk, a rotating shaft, a variable-section arch, a rigid ring, and a limiting pin. The rotating shaft is mounted at the center of the disk, and an annular groove coaxial with the disk is provided on the side of the disk. A plurality of variable-section arches are evenly distributed circumferentially and assembled on the inner side of the annular groove. The rigid ring is separated from the variable-section arch by a predetermined distance and is located in the annular groove and on the outer side of the variable-section arch. The rigid ring is connected to the arch top of the variable-section arch by a limiting pin to limit the relative position of the arch top of the variable-section arch and the rigid ring, thereby preventing the contact position of the variable-section arch with the rigid ring from changing when the variable-section arch is deformed too much, and ensuring that the force application point of the variable-section arch is consistent under different deformations. The present invention can effectively suppress the vibration amplitude of the rotor system within a wide speed range, occupies less space than traditional nonlinear spring vibration damping devices, and is suitable for installation in rotor systems with limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration damping devices, in particular to a variable-section arched nonlinear vibration damping device for a rotor system. Background Art

[0002] As the core component of rotating machinery, it is extremely important to ensure the stability and reliability of the rotor system's operation. Current designs of rotating machinery tend to be high-speed and heavy-loaded. The eccentricity of the rotor system may cause large vibrations due to resonance near the critical speed, seriously affecting the stable operation of the rotating machinery. Therefore, it is very necessary to suppress the vibration of the rotor system. Compared with linear vibration damping devices, nonlinear vibration damping devices can effectively suppress the vibration of the system over a wider frequency range without changing the free vibration characteristics of the system itself, and are therefore widely used. However, currently common nonlinear vibration damping devices are often complex in structure and large in size, making them difficult to adapt to the high-speed and heavy-load operating environment of the rotor system and the relatively narrow installation space.

[0003] Therefore, it is necessary to design a nonlinear vibration reduction device with simple structure and high strength to achieve vibration suppression of the rotor system. Summary of the Invention

[0004] The purpose of the present invention is to address the problems in the prior art and provide a variable-section arch nonlinear vibration damping device for a rotor system that is simple in structure and easy to implement. The variable-section arch is used instead of a nonlinear spring to provide nonlinear stiffness of the vibration damping device, thereby achieving vibration suppression of the large vibration caused by resonance of the rotor system near the critical speed.

[0005] The present invention is implemented as follows: a variable-section arch nonlinear vibration damping device for a rotor system includes a disc, a rotating shaft, a variable-section arch, a rigid ring, and a limit pin; the rotating shaft is installed at the center of the disc, and the disc is provided with an annular groove coaxial with the disc on the side; a plurality of variable-section arches are evenly distributed circumferentially and assembled on the inner side of the annular groove; the rigid ring is separated from the variable-section arch by a predetermined distance, is located in the annular groove and on the outer side of the variable-section arch; the rigid ring is connected to the arch top of the variable-section arch through the limit pin to limit the relative position of the arch top of the variable-section arch and the rigid ring, to prevent the contact position of the variable-section arch with the rigid ring from changing when the deformation of the variable-section arch is too large, and to ensure that the force application point of the variable-section arch is consistent under different deformations.

[0006] The variable-section arch, the rigid ring and the limiting pin are symmetrically installed in the annular groove on the side of the disc along the axis of the disc.

[0007] Wherein, in the direction of installing the variable-section arch in the annular groove, corresponding avoidance grooves for the variable-section arch are respectively opened on the inner side of the annular groove to prevent the variable-section arch from colliding with the inner side of the annular groove when deformed by force.

[0008] Wherein, the limiting pin is a hollow cylindrical pin.

[0009] Wherein, the thickness of the variable-section arch is smaller than the thickness of the rigid ring.

[0010] The thickness of the variable-section arch is the largest at both ends and the smallest at the top of the arch, so that the arch exhibits obvious nonlinear characteristics when deformed under load, thereby providing nonlinear stiffness for the vibration reduction device.

[0011] Wherein, the variable cross-section arch is fixedly assembled on the inner side of the annular groove using two fixing bolts.

[0012] Wherein, the variable-section arch is mounted on the circumferential surface of the variable-section arch mounting boss on the inner side of the annular groove using two fixing bolts.

[0013] Among them, a variable-section arch avoidance groove is opened on the circumferential surface of the variable-section arch mounting convex disc, the number of the variable-section arch avoidance grooves is consistent with the number of the variable-section arches, and one variable-section arch is correspondingly installed on the outside of one variable-section arch avoidance groove.

[0014] There are openings around the vault of the variable-section arch and the rigid ring respectively, so as to connect the vault of the variable-section arch and the rigid ring through the limiting pins.

[0015] The present invention utilizes the nonlinear buckling characteristics of the arch structure and avoids the buckling behavior of the arch structure by designing the variable cross-section of the arch structure, thereby realizing the nonlinear stiffness of the variable cross-section arch in its deformation area.

[0016] The device of the present invention has a simple overall structure, high reliability and low processing cost.

[0017] The variable-section arch, rigid ring and limit pin of the present invention are directly assembled in the disc of the rotor system without occupying additional space, and are suitable for vibration reduction of some smaller rotor systems.

[0018] The present invention can achieve adjustment of different vibration isolation frequency ranges by changing the size parameters of the variable-section arch and the length of the limit pin, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a variable-section arched nonlinear vibration reduction device for a rotor system according to an embodiment of the present invention.

[0020] Figure 2 This is a comparison diagram of load-displacement curves of a constant-section arch and a variable-section arch for a variable-section arch nonlinear vibration damping device for a rotor system according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of a variable-section arch in a variable-section arch nonlinear vibration reduction device for a rotor system according to an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of a disc in a variable-section arched nonlinear vibration damping device for a rotor system according to an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of a rigid ring in a variable-section arched nonlinear vibration damping device for a rotor system according to an embodiment of the present invention.

[0024] Numbers in the figure:

[0025] 1-disc, 2-rotating shaft, 3-variable cross-section arch, 4-rigid ring, 5-limit pin. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0027] like Figure 1 As shown, a variable-section arch nonlinear vibration damping device for a rotor system includes a disk 1, a rotating shaft 2, multiple variable-section arches 3, a rigid ring 4, and a limit pin 5; the rotating shaft 2 is installed at the center of the disk 1, and the disk 1 has an annular groove on the inner side, and the annular groove is symmetrical along the axis center of the disk. Multiple variable-section arches 3 are distributed circumferentially and assembled on the inner side of the annular groove, and the rigid ring 4 is connected to the arch tops of the multiple variable-section arches 3 through a limit pin 5 installed between the variable-section arch 3 and the rigid ring 4, wherein the limit pin 5 is installed between the variable-section arch 3 and the rigid ring 4 and fits tightly with the variable-section arch 3 and the rigid ring 4, with the purpose of limiting the relative position of the arch top of the variable-section arch and the rigid ring, so as to ensure that the force application points of the variable-section arch 3 are consistent under different deformations.

[0028] In some embodiments, the variable-section arch 3, the rigid ring 4 and the limiting pin 5 are symmetrically installed in the coaxial annular groove on the side of the disk along the axis of the disk.

[0029] The limiting pin 5 is preferably a hollow cylindrical pin.

[0030] For some embodiments, see Figure 4As shown, the annular groove on the disc 1 is provided with a larger variable-section arch avoidance groove in the direction of installing the variable-section arch 3, with the purpose of providing sufficient deformation space for the variable-section arch 3. In the assembly form with four variable-section arches, larger variable-section arch avoidance grooves are respectively provided on the inner side of the annular groove in the four directions of installing the four variable-section arches, with the purpose of preventing the variable-section arch from colliding with the inner side of the annular groove when it is deformed under force.

[0031] In some embodiments, as shown in FIG1 , the variable-section arch 3 is provided with two bolt holes near both ends, through which two fixing bolts are mounted on the inner side of the annular groove. In some embodiments, the variable-section arch is mounted on the circumference of a variable-section arch mounting flange inside the annular groove using two fixing bolts, and the circumference of the variable-section arch mounting flange has corresponding bolt holes.

[0032] In some embodiments, the variable-section arch avoidance groove is provided on the circumferential surface of the variable-section arch mounting boss, wherein the number of the variable-section arch avoidance grooves is consistent with the number of the variable-section arches, and one variable-section arch is correspondingly installed on the outer side of one variable-section arch avoidance groove.

[0033] Wherein, a rotating shaft mounting hole is arranged at the center of the variable-section arch mounting boss to mount the rotating shaft.

[0034] like Figure 2 As shown in the figure, when the arch structure is subjected to a load with the action point located at the arch top, its load-displacement curve shows obvious nonlinear characteristics. Since there is obvious buckling behavior in the load-displacement curve of the uniform cross-section arch structure, which will affect its vibration stability, the following is adopted: Figure 3 The variable cross-section arch 3 shown has the largest thickness at both ends and the smallest thickness at the arch top to avoid the buckling behavior of the arch structure, so that it exhibits nonlinear characteristics when deformed under load, providing nonlinear stiffness of the vibration reduction device.

[0035] like Figure 5 As shown, Figure 5 The structure of the rigid ring of the present invention is shown. The rigid ring is a circular metal ring, much thicker than the variable-section arch. It has openings around its perimeter for mating with the vault of the variable-section arch via retaining pins or stud nuts. Of course, corresponding connection openings are formed on the surface of the vault of the variable-section arch.

[0036] The working process of the variable cross-section arched nonlinear vibration damping device for a rotor system of the present invention is as follows:

[0037] When the rotor system resonates near its critical speed, the resulting large vibrations are transmitted through the variable-section arch 3 to the rigid ring 4, causing it to vibrate along with it. Rigid ring 4, unlike the inherent properties of the rotor system, does not resonate. However, the variable-section arch 3, acting at the arch top where the stop pin 5 is connected, deforms under the load. This deformation provides nonlinear stiffness for the vibration damping device.

[0038] Furthermore, since the radial deformation of the variable-section arch 3 is much greater than its tangential deformation, the tangential deformation can be neglected. The vibration of the rigid ring 4 acts on the variable-section arch 3 and is ultimately transmitted to the rotor system, generating a force in the opposite direction of the rotor system's large vibrations, thereby suppressing the rotor system's vibrations.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A variable cross-section arched nonlinear vibration damping device for a rotor system, characterized in that: It includes a circular disc, a rotating shaft, a variable-section arch, a rigid ring, and a limit pin; the rotating shaft is installed in the center of the circular disc, and an annular groove coaxial with the circular disc is provided on the side of the circular disc, and a plurality of variable-section arches are evenly distributed circumferentially and assembled on the inner side of the annular groove; the rigid ring is separated from the variable-section arch by a predetermined distance, is located in the annular groove and on the outer side of the variable-section arch, and the rigid ring is connected to the arch top of the variable-section arch through the limit pin to limit the relative position of the arch top of the variable-section arch and the rigid ring, so as to prevent the contact position of the variable-section arch with the rigid ring from changing when the deformation of the variable-section arch is too large, and ensure that the force application point of the variable-section arch is consistent under different deformations.

2. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The variable-section arch, the rigid ring and the limiting pin are symmetrically installed in the annular groove on the side surface of the disc along the axis center of the disc.

3. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: In the direction of installing the variable-section arch in the annular groove, corresponding avoidance grooves for the variable-section arch are respectively opened on the inner side of the annular groove to prevent the variable-section arch from colliding with the inner side of the annular groove when deformed by force.

4. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The limiting pin is a hollow cylindrical pin.

5. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The thickness of the variable-section arch is smaller than the thickness of the rigid ring.

6. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The thickness of the variable cross-section arch is the largest at both ends and the smallest at the arch top, so that the arch exhibits obvious nonlinear characteristics when deformed under load, thereby providing nonlinear stiffness of the vibration reduction device.

7. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The variable-section arch is fixedly assembled on the inner side of the annular groove using two fixing bolts.

8. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The variable-section arch is mounted on the circumferential surface of the variable-section arch mounting flange on the inner side of the annular groove using two fixing bolts.

9. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 8, characterized in that: A variable-section arch avoidance groove is provided on the circumferential surface of the variable-section arch mounting convex disc. The number of the variable-section arch avoidance grooves is consistent with the number of the variable-section arches. One variable-section arch is correspondingly mounted on the outside of one variable-section arch avoidance groove.

10. The variable cross-section arched nonlinear vibration damping device for a rotor system according to claim 1, characterized in that: The top of the variable-section arch and the four sides of the rigid ring are respectively provided with openings, which are used to connect the top of the variable-section arch and the rigid ring through the limiting pins.

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