Device for suppressing vibration of rotor system

Abstract

The invention relates to a device for suppressing vibration of a rotor system, the device comprises a starting motor, a rotating shaft, bearing fixing seats and a vibration damper, a rotor of the starting motor is connected with the rotating shaft through a coupler, the bearing fixing seats are arranged on the two sides of the rotating shaft respectively, and the vibration damper comprises a fixing seat, a screw rod, a fan-shaped adjusting plate, a linear spring and an inner ring mass block. A round through hole is formed in the middle of the fixing base, the rotating shaft is sleeved with an inner ring mass block through a deep groove ball bearing, a plurality of linear springs are evenly distributed on the outer side of the inner ring mass block in a surrounding mode, fan-shaped adjusting plates are arranged at the outer ends of the linear springs and fixed in the round through hole of the fixing base through lead screws, and the lead screws penetrate through the fixing base. A plurality of vibration absorption mechanisms are integrated into the mechanical vibration reduction device, part of vibration of the rotating shaft is reduced through the rigidity provided by the linear springs, meanwhile, secondary vibration reduction is conducted on the rotating shaft through elastic deformation generated by extrusion, and therefore the purpose of double vibration reduction is achieved.

Description

Technical Field

[0001] The invention relates to a device for suppressing vibration of a rotor system, and belongs to the technical field of rotor vibration suppression. Background Art

[0002] Rotating machinery plays a vital role in China's basic industries and is a key component of modern engineering manufacturing. It has a wide range of applications, including steam turbines, hydraulic turbines, and electric motors. The rotor system, its core component, plays a crucial role. With the rapid development of the manufacturing industry, high speed and heavy loads have become the main development direction of rotating machinery. This places higher demands on the rotor system's performance indicators, such as speed, stability, and life cycle. However, a persistent problem is the instability caused by rotor system vibration, which in turn leads to a series of faults and failures. Therefore, controlling rotor system vibration has always been a pressing issue.

[0003] Motors, machine tool compressors, turbomachinery, aircraft gas turbines, and other mechanical systems are common rotating machinery in industrial production. Typically, mechanical systems experience vibrations when subjected to external or internal faults such as imbalance, misalignment, shaft bending, and friction, leading to a series of chain reactions. Approximately 70% of rotating machinery failures are caused by shaft misalignment, and the excitation force response generated by misalignment is four times that of an unbalanced fault. Excessive vibration caused by rotor misalignment and imbalance in compressors can pose serious safety risks and significant economic losses. Therefore, rotor imbalance vibration control technology is of vital importance for high-speed rotating machinery.

[0004] Currently, vibration control of rotor systems primarily utilizes vibration cancellation, vibration reduction, and vibration absorption. Depending on whether or not external energy is required, vibration control systems are categorized into three types: passive control, active control, and hybrid control. Because passive vibration control requires no external energy, offers a simple structure, ease of implementation, and excellent economical and reliable performance. Furthermore, it effectively controls vibrations across a wide frequency range in many engineering applications and has been widely adopted in rotor systems. Specifically, various damping mechanisms are installed on the rotor system to increase system damping, and various vibration absorption devices are installed to absorb rotor vibration energy.

[0005] For rotor systems, passive control primarily involves mechanical vibration damping devices, such as variable-stiffness damping mechanisms and nonlinear energy-sink structures. During use, these rotors lack spring adjustment, resulting in a fixed spring's vibration-absorbing strength. However, when the rotor's amplitude is excessively large or small, the spring's tightness is difficult to adjust, effectively preventing the rotor's amplitude from being effectively dampened. Therefore, the present invention proposes a device for damping rotor system vibration. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention provides a device for suppressing rotor system vibrations. This device integrates multiple vibration-absorbing mechanisms into a mechanical vibration damping device. The stiffness provided by the linear springs reduces some of the vibrations of the rotating shaft, while the elastic deformation generated by extrusion simultaneously provides secondary vibration damping for the rotating shaft, thereby achieving dual vibration damping. Furthermore, by controlling the rotation of the screw, the displacement of the adjustment plate, and thus the tightness of the spring, can be adjusted to meet the vibration damping requirements of the rotor system under different amplitudes, significantly expanding the range of applications for the mechanical vibration damping device.

[0007] The present invention provides the following technical solution: a device for suppressing vibration of a rotor system, comprising a starter motor, a rotating shaft, a bearing fixing seat, and a vibration damping device, wherein the rotor of the starter motor is connected to the rotating shaft via a coupling, bearing fixing seats are respectively provided on both sides of the rotating shaft, and the vibration damping device is provided in the middle of the rotating shaft;

[0008] The vibration damping device includes a fixed seat, a screw, a fan-shaped adjustment plate, a linear spring and an inner ring mass block. The middle part of the fixed seat is a circular through hole. The rotating shaft is equipped with an inner ring mass block through a deep groove ball bearing. Several linear springs are evenly distributed around the outside of the inner ring mass block. A fan-shaped adjustment plate is provided at the outer end of the linear spring. The fan-shaped adjustment plate is fixed in the circular through hole of the fixed seat through a screw, and the screw passes through the fixed seat.

[0009] Preferably, according to the present invention, the two sides of the fan-shaped adjustment plate are respectively penetrated by guide rods through the fixed seat, and the guide rods and the fixed seat are slidably connected. When the fan-shaped adjustment plate moves, the two guide rods can position the movement trajectory of the fan-shaped adjustment plate, thereby ensuring that the deformation of the linear spring is not offset.

[0010] Preferably, according to the present invention, corresponding limit blocks are provided on the sector-shaped adjustment plate and the inner annular mass block, and the linear spring is fixed by inserting the limit blocks at both ends.

[0011] Preferably, according to the present invention, at least two linear springs are provided, and the specific number can be adjusted accordingly according to the application scenario.

[0012] Preferably, according to the present invention, an eccentric inertia disk is provided on the rotating shaft on one side of the vibration damping device. The inertia disk generates an eccentric mass, which causes the rotating shaft to vibrate to a certain extent, facilitating vibration damping testing and observing the vibration damping effect of the vibration damping device.

[0013] Preferably, according to the present invention, the starter motor is fixed to the motor bracket via a fixing plate, and the motor bracket, the bearing fixing seat and the vibration damping device are all fixed to the base via fastening bolts.

[0014] The working method of the above-mentioned device for suppressing rotor system vibration comprises the following steps:

[0015] (1) Turn the screw and adjust the position of the fan-shaped adjustment plate so that the linear spring has an initial preload. Then start the motor and the rotor drives the shaft to rotate synchronously through the coupling. Since there is an inertia disk on the shaft, an unbalanced mass will be generated, causing the shaft to vibrate. The vibration of the shaft causes the vibration damping spring to react quickly and absorb part of the vibration quickly. In addition, due to the elastic deformation caused by the extrusion of the fan-shaped adjustment plate, the secondary vibration reduction of the shaft can be completed. The two vibration reduction methods are alternated when the shaft is running to complete the double suppression of the shaft vibration; when the starting motor speed increases, the vibration amplitude of the shaft increases, and the compression of the linear spring is observed. If the shaft amplitude is too large, the screw is turned to move the adjustment plate inward, thereby further squeezing the linear spring and adjusting the tightness of the linear spring, so that it is suitable for the vibration reduction effect of the rotor system under different amplitudes.

[0016] (2) When the starting motor is turned off, the bearing fixing seats on both sides cooperate with the vibration reduction device to keep the rotating shaft in the center state at all times, thereby improving the safety of the rotor system.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention integrates multiple vibration absorbing mechanisms into a mechanical vibration reduction device, reduces part of the vibration of the rotating shaft through the stiffness provided by the linear spring itself, and simultaneously utilizes the elastic deformation generated by extrusion to perform secondary vibration reduction on the rotating shaft, thereby achieving the purpose of double vibration reduction.

[0019] 2. The present invention can adjust the displacement of the adjustment plate by controlling the rotation of the screw rod, thereby changing the tightness of the spring to adapt to the vibration reduction requirements of the rotor system under different amplitudes, greatly improving the scope of use of the mechanical vibration reduction device.

[0020] 3. The vibration reduction device of the present invention can protect the rotor structure. Whether during or after operation of the motor, it can help the rotor structure maintain a centered position, prevent internal structures from colliding, and improve the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the vibration reduction device of the present invention;

[0023] Among them, 1-motor bracket, 2-starting motor, 3-rotating shaft, 4-left bearing fixing seat, 5-inertia disk, 6-fixing seat, 7-right bearing fixing seat, 8-inner ring mass block, 9-vibration damping device, 10-tightening bolt, 11, fixing plate;

[0024] 21-rotor, 22-coupling;

[0025] 31-deep groove ball bearing;

[0026] 91-screw rod, 92-fan-shaped adjustment plate, 93-guide rod, 94-linear spring. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to embodiments and accompanying drawings, but is not limited thereto.

[0028] Example 1:

[0029] like Figure 1-2 As shown, this embodiment provides a device for suppressing vibration of a rotor system, comprising a starter motor 2, a rotating shaft 3, a left bearing fixing seat 4, a right bearing fixing seat 7, and a vibration damping device 9. The rotor 21 of the starter motor 2 is connected to the rotating shaft 3 via a coupling 22. The left bearing fixing seat 4 and the right bearing fixing seat 7 are respectively provided on both sides of the rotating shaft 3. The vibration damping device 9 is provided in the middle of the rotating shaft 3.

[0030] The vibration damping device includes a fixed seat 6, a screw rod 91, a fan-shaped adjustment plate 92, a linear spring 94 and an inner ring mass block 8. The middle part of the fixed seat 6 is a circular through hole. The rotating shaft 3 is equipped with the inner ring mass block 8 through a deep groove ball bearing 31. Four linear springs 94 are evenly distributed around the outside of the inner ring mass block 8. A fan-shaped adjustment plate 92 is provided at the outer end of the linear spring 94. The fan-shaped adjustment plate 92 is fixed in the circular through hole of the fixed seat through the screw rod 91, and the screw rod 91 passes through the fixed seat.

[0031] Corresponding limit blocks are provided on the sector-shaped adjustment plate 92 and the inner annular mass block 8, and the linear spring is fixed by inserting the limit blocks at both ends.

[0032] An eccentric inertia disk 5 is provided on the rotating shaft 3 on one side of the vibration reduction device 9. The inertia disk generates an eccentric mass, which causes the rotating shaft to vibrate to a certain extent, making it convenient to perform vibration reduction tests and observe the vibration reduction effect of the vibration reduction device.

[0033] The starting motor 2 is fixed to the motor bracket 1 through the fixing plate 11. The motor bracket 1, the left bearing fixing seat 4, the right bearing fixing seat 7 and the vibration reduction device 9 are all fixed to the base through the tightening bolts 10. The base is not shown in the figure. In specific applications, the base can be directly installed at the place where power output is required.

[0034] The working method of the above-mentioned device for suppressing rotor system vibration comprises the following steps:

[0035] (1) Turn the screw 91 to adjust the position of the fan-shaped adjustment plate 92 so that the linear spring 94 has an initial preload, then start the motor 2 and turn it on. The rotor 21 drives the shaft 3 to rotate synchronously through the coupling 22. Since there is an inertia disk 5 on the shaft 3, an unbalanced mass will be generated, causing the shaft 3 to vibrate. The vibration of the shaft causes the vibration-damping spring 94 to react quickly and absorb part of the vibration quickly. In addition, due to the elastic deformation caused by the extrusion of the fan-shaped adjustment plate 92, secondary vibration reduction of the shaft can be completed. The two vibration reduction methods are alternated during the operation of the shaft to complete the double suppression of the vibration of the shaft 3. When the speed of the starting motor 2 increases, the vibration amplitude of the shaft 3 increases. Observe the compression of the linear spring 94. If the amplitude of the shaft 3 is too large, turn the screw 91 to move the adjustment plate inward, thereby further squeezing the linear spring 94 and adjusting the tightness of the linear spring, so that it is suitable for the vibration reduction effect of the rotor system under different amplitudes.

[0036] (2) When the starting motor 2 is turned off, the left bearing fixing seat 4, the right bearing fixing seat 7 and the vibration reduction device 9 cooperate to keep the rotating shaft 3 in a centered state at all times, thereby improving the safety of the rotor system.

[0037] Example 2:

[0038] A device for suppressing vibration of a rotor system has a structure as described in Example 1, except that guide rods 93 are respectively passed through the fixed seat 6 on both sides of the fan-shaped adjustment plate 92, and the guide rods 93 are slidably connected to the fixed seat 6. When the fan-shaped adjustment plate moves, the two guide rods can position the movement trajectory of the fan-shaped adjustment plate, thereby ensuring that the deformation of the linear spring is not offset.

[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 within the scope of protection of the present invention.

Claims

1. A device for suppressing vibration of a rotor system, characterized in that: The invention comprises a starting motor (2), a rotating shaft (3), a bearing fixing seat (4, 7) and a vibration damping device (9), wherein the rotor (21) of the starting motor (2) is connected to the rotating shaft (3) via a coupling (22), the bearing fixing seats (4, 7) are respectively provided on both sides of the rotating shaft (3), and the vibration damping device (9) is provided in the middle of the rotating shaft (3); The vibration damping device (9) comprises a fixed seat (6), a screw rod (91), a fan-shaped adjustment plate (92), a linear spring (94) and an inner ring mass block (8). The middle part of the fixed seat (6) is a circular through hole. The rotating shaft (3) is provided with the inner ring mass block (8) through a deep groove ball bearing (31). A plurality of linear springs (94) are evenly distributed around the outer side of the inner ring mass block (8). The outer end of the linear spring (94) is provided with a fan-shaped adjustment plate (92). The fan-shaped adjustment plate (92) is fixed in the circular through hole of the fixed seat (6) through a screw rod (91). The screw rod (91) passes through the fixed seat (6).

2. The device for suppressing vibration of a rotor system according to claim 1, characterized in that: Both sides of the sector-shaped regulating plate (92) respectively pass through the fixing seat (6) through the guide rods (93), and the guide rods (93) and the fixing seat (6) are in sliding connection.

3. The device for suppressing vibration of a rotor system according to claim 1, wherein: Corresponding limit blocks are provided on the sector-shaped adjustment plate (92) and the inner annular mass block (8).

4. The device for suppressing vibration of a rotor system according to claim 1, wherein: At least two linear springs (94) are provided.

5. The device for suppressing vibration of a rotor system according to claim 1, wherein: An eccentric inertia disk (5) is provided on the rotating shaft (3) on one side of the vibration damping device (9).

6. The device for suppressing vibration of a rotor system according to claim 1, wherein: The starting motor (2) is fixed to the motor bracket (1) via a fixing plate (11), and the motor bracket (1), the bearing fixing seat (4, 7) and the vibration reduction device (9) are all fixed to the base via fastening bolts (10).

Images