Composite damping device for vibration suppression of steam turbine rotor

Abstract

The utility model relates to the technical field of steam turbine rotors, in particular to a composite damping device for vibration suppression of a steam turbine rotor, which comprises a composite damping plate, a buffer plate and a buffer cover. The top of the composite damping plate is fixedly connected with a damping spring, the end, away from the composite damping plate, of the damping spring is fixedly connected to the bottom of a buffer plate, the inner side wall of the buffer plate is fixedly connected with a buffer box, the buffer cover is slidably connected to the inner side wall of the buffer box, and the top of the buffer cover is fixedly connected with a connecting plate. Vibration is transmitted to the buffer box through the buffer cover, residual vibration is attenuated step by step through the buffer plate, the viscous damper and the composite damping plate, rotor vibration is effectively reduced through a multi-stage damping structure, the running stability of a steam turbine is improved, the step-by-step vibration absorption mode is achieved, the vibration suppression effect of the steam turbine rotor is improved, and the service life of the steam turbine rotor is prolonged. And the operation safety and reliability of the equipment are ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine rotor technical field especially relates to a steam turbine rotor vibration suppression's composite damping device. BACKGROUND

[0002] Steam turbine is the important equipment of modern energy conversion, as one of its core components, the rotor bears the influence of high temperature, high speed rotation and complex load in the operation process, and the stability of the rotor is directly related to the operation efficiency and service life of steam turbine, in order to ensure the stable operation of steam turbine, it is necessary to adopt special damping device to control the rotor vibration, make it keep in the safety range, and reduce the energy loss and structural fatigue caused by vibration.

[0003] The existing steam turbine rotor damping device usually adopts single viscous damper to carry out vibration suppression, although the viscous damper can effectively absorb part of vibration energy, but due to the limitation of single damping form, it is difficult to cover the vibration problems of different frequency and amplitude, so the overall damping effect is limited, and in the high speed operation process of steam turbine rotor, the single viscous damper is difficult to adapt to the complex vibration environment, and it is difficult to achieve hierarchical and step-by-step attenuation of vibration, thereby affecting the operation stability of steam turbine.

[0004] Therefore, in view of the above problems existing in the prior art steam turbine rotor damping device, the utility model adopts the buffer box as the core damping mechanism, the vibration generated in the work of steam turbine rotor is transmitted to the buffer box through the buffer cover, drives the connecting block, connecting seat and buffer rod to move synchronously, and then drives the sliding seat to slide in the buffer box, when the sliding block moves in the sliding slot, the damping filler of liquid silicone rubber material is filled in the buffer box, which can effectively limit the movement speed of the sliding block and the buffer rod, and form good damping effect, thereby absorbing vibration, at the same time, the damping filler completely wraps the moving parts, and enhances the vibration suppression capacity by relying on its excellent damping characteristics, then, the remaining vibration is attenuated step by step through the buffer plate, viscous damper and composite damping plate, and the wideband vibration is efficiently absorbed, the way of step-by-step absorbing vibration is realized, the vibration suppression effect of steam turbine rotor is improved, and the safety and reliability of equipment operation are ensured. UTILITY MODEL CONTENTS

[0005] In order to overcome the common steam turbine rotor vibration suppression's composite damping device, the existing steam turbine rotor damping device usually adopts single viscous damper, although it can absorb part of vibration, but due to its limitation, it is difficult to cover the vibration of different frequency and amplitude, and affect the overall damping effect, in the high speed operation process of rotor, the single damper is difficult to adapt to the complex vibration environment, and cannot realize step-by-step attenuation, thereby affecting the operation stability problem.

[0006] The technical scheme of the utility model is:

[0007] A composite damping device for inhibiting the vibration of a steam turbine rotor, comprising a composite damping plate, a buffer plate and a buffer cover; the top of the composite damping plate is fixedly connected with a damping spring, the end of the damping spring away from the composite damping plate is fixedly connected to the bottom of the buffer plate, a buffer box is fixedly connected to the inner side wall of the buffer plate, the buffer cover is slidingly connected to the inner side wall of the buffer box, the buffer cover is located near the top of the buffer box, and the top of the buffer cover is fixedly connected with a connecting plate.

[0008] Preferably, the composite damping plate is a metal-rubber sandwich structure, the damping springs are symmetrically installed at the four corners of the top of the composite damping plate, and the buffer box is located near the top of the buffer plate.

[0009] Preferably, the top of the composite damping plate is fixedly connected with a first connecting piece, the first connecting piece is symmetrically installed at a position close to the damping spring, and a viscous damper is fixedly connected to the inner side wall of the first connecting piece.

[0010] Preferably, the end of the viscous damper away from the first connecting piece is fixedly connected with a second connecting piece, the second connecting piece is fixedly connected to the bottom of the buffer box, and the second connecting piece is symmetrically installed at the four corners of the bottom of the buffer box.

[0011] Preferably, the inside of the buffer box is filled with a damping filler, a sliding groove is formed in the inside of the buffer box, the sliding groove is symmetrically distributed at a position close to the bottom of the buffer box, a sliding block is slidingly connected to the inside of the sliding groove, a sliding seat is fixedly connected to the top of the sliding block, and the sliding seat is slidingly connected to the inside of the buffer box.

[0012] Preferably, a buffer rod is rotatably connected to the inner side wall of the sliding seat, a connecting seat is rotatably connected to the end of the buffer rod away from the sliding seat, a connecting block is fixedly connected to the outer side wall of the connecting seat, the connecting seat is symmetrically installed on the outer side wall of the connecting block, and the connecting block is fixedly connected to the side of the buffer cover away from the connecting plate.

[0013] Preferably, a rubber pad is fixedly connected to the top of the connecting plate, a connecting bolt is fixedly connected to the top of the rubber pad, the connecting bolt is symmetrically installed at the top of the rubber pad, a connecting nut is rotatably connected to the outer side wall of the connecting bolt, and the connecting nut is rotatably connected to the top of the rubber pad.

[0014] The utility model discloses beneficial effects:

[0015] 1、When the device is ready for use, it is fixed to the secondary oil pipeline of the external turbine near the oil motor through the connecting bolt and the connecting nut, and when the turbine is running, the vibration generated by the rotor is transmitted step by step through the connecting plate and the rubber pad, and since the rubber pad itself has certain damping characteristics, it can absorb part of the vibration in the initial stage, reduce the intensity of the vibration transmitted downward, and improve the preliminary vibration reduction effect of the device;

[0016] 2、In the process of vibration attenuation step by step, the vibration is transmitted to the buffer box through the buffer cover, the buffer cover slides up and down under the action of vibration, driving the connecting block and the connecting seat to move synchronously, pushing the buffer rod to move inside the buffer box, the movement of the buffer rod further drives the sliding seat to slide inside the buffer box, thereby driving the sliding block to slide along the sliding groove, the damping filler in the buffer box effectively limits the movement speed of the sliding block and the buffer rod, forming a damping effect, absorbing vibration, the damping filler completely wraps the sliding block, the buffer rod and the connecting block, and the damping filler made of liquid silicone rubber further enhances the vibration suppression effect of the buffer box, improving the overall vibration reduction capacity of the device;

[0017] 3、When the buffer box absorbs part of the vibration, the remaining vibration is transmitted downward to the buffer plate and the bottom of the buffer box, the damping spring at the bottom of the buffer plate further attenuates the vibration, at the same time, the vibration at the bottom of the buffer box is transmitted to the viscous damper through the second connecting piece, the viscous damper absorbs the remaining vibration, finally, the vibration is conducted to the composite damping plate through the first connecting piece, the composite damping plate combines the rigidity of metal and the damping characteristics of rubber, effectively absorbing wideband vibration, further reducing the vibration amplitude. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The overall top view structure schematic diagram of the utility model is shown;

[0019] Figure 2 The overall bottom view structure schematic diagram of the utility model is shown;

[0020] Figure 3 The composite damping plate structure schematic diagram of the utility model is shown;

[0021] Figure 4 The buffer box structure schematic diagram of the utility model is shown;

[0022] Figure 5 The connecting plate structure schematic diagram of the utility model is shown.

[0023] Explanation of reference signs: 1, composite damping plate; 101, first connecting piece; 102, viscous damper; 103, second connecting piece; 2, damping spring; 3, buffer plate; 4, buffer box; 401, damping filler; 402, sliding seat; 403, sliding block; 404, sliding groove; 405, buffer rod; 406, connecting seat; 407, connecting block; 5, buffer cover; 6, connecting plate; 601, rubber pad; 602, connecting bolt; 603, connecting nut. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Please refer to Figures 1-5 The utility model provides a kind of technical scheme: a kind of composite damping device for turbine rotor vibration suppression, including composite damping plate 1, buffer plate 3 and buffer cover 5;The top of composite damping plate 1 is fixedly connected with damping spring 2, and the end of damping spring 2 away from composite damping plate 1 is fixedly connected at the bottom of buffer plate 3, and buffer box 4 is fixedly connected on the inner side wall of buffer plate 3, and buffer cover 5 is slidably connected on the inner side wall of buffer box 4, buffer cover 5 is located at the position close to the top of buffer box 4, and the top of buffer cover 5 is fixedly connected with connecting plate 6.

[0026] Composite damping plate 1 is metal-rubber sandwich structure, and damping spring 2 is symmetrically installed at the four corners of the top of composite damping plate 1, and buffer box 4 is located at the position close to the top of buffer plate 3, and composite damping plate 1 combines the rigidity of metal and the damping characteristics of rubber, can effectively absorb wideband vibration, and the symmetric installation of damping spring 2 can balance stress, improve the stability of device.

[0027] The top of composite damping plate 1 is fixedly connected with first connecting piece 101, and first connecting piece 101 is symmetrically installed at the position close to damping spring 2, and the inner side wall of first connecting piece 101 is fixedly connected with viscous damper 102, and viscous damper 102 can provide damping effect synchronously in the process of deformation of damping spring 2, effectively absorb vibration energy, improve overall damping effect.

[0028] The second connecting piece 103 is fixedly connected to the bottom of the buffer tank 4, is symmetrically installed at the four corners of the bottom of the buffer tank 4, uniformly distributes stress of the viscous damper 102, and effectively transmits vibration from the bottom of the buffer tank 4 to the viscous damper 102, so that the effect of step-by-step buffering vibration is realized, and the absorption efficiency of the multi-stage damper is improved.

[0029] The buffer tank 4 is filled with a damping filler 401, and a sliding groove 404 is arranged in the buffer tank 4, the sliding groove 404 is symmetrically arranged near the bottom of the buffer tank 4, a sliding block 403 is slidably connected in the sliding groove 404, and a sliding seat 402 is fixedly connected to the top of the sliding block 403 and slidably connected in the buffer tank 4. The damping filler 401 can form a fluid damping effect on the movement of the sliding seat 402 and the sliding block 403, effectively dissipate vibration energy, and reduce the transmission strength of vibration.

[0030] The buffer rod 405 is rotatably connected to the inner side wall of the sliding seat 402, the connecting seat 406 is rotatably connected to one end of the buffer rod 405 away from the sliding seat 402, the connecting block 407 is fixedly connected to the outer side wall of the connecting seat 406, the connecting seat 406 is symmetrically installed on the outer side wall of the connecting block 407, and the connecting block 407 is fixedly connected to one side of the buffer cover 5 away from the connecting plate 6. The buffer rod 405 can produce a certain displacement under the action of vibration, so that it can more flexibly respond to vibration transmission, effectively disperse vibration energy, and reduce the strength of vibration transmission.

[0031] The connecting plate 6 is fixedly connected with a rubber pad 601, the rubber pad 601 is fixedly connected with a connecting bolt 602, the connecting bolt 602 is symmetrically installed on the top of the rubber pad 601, the connecting nut 603 is rotatably connected to the outer side wall of the connecting bolt 602, and the connecting nut 603 is rotatably connected to the top of the rubber pad 601. The rubber pad 601 has good elasticity and damping characteristics, can absorb part of the energy in the initial stage of vibration transmission, and reduces the direct transmission of high-frequency vibration.

[0032] Working principle: according to Figure 5 When the device is ready for use, first, the connecting bolt 602 and the connecting nut 603 are fixed to the secondary oil pipeline of the external steam turbine near the oil engine, at this time, the steam turbine starts to work, the vibration generated by the rotor is transmitted to the device as a whole through the connecting plate 6 and the rubber pad 601, and since the rubber pad 601 itself has certain damping characteristics, it can absorb part of the vibration in the initial stage, and reduce the strength of the vibration transmission.

[0033] According to Figure 4In the process of vibration gradually attenuating, firstly, the vibration generated by the steam turbine rotor is transmitted to the buffer box 4 through the buffer cover 5, the buffer cover 5 slides up and down under the action of vibration, drives the connecting block 407 and the connecting seat 406 to move synchronously, at the same time, pushes the buffer rod 405 to move inside the buffer box 4, the movement of the buffer rod 405 further drives the sliding seat 402 to slide inside the buffer box 4, the sliding seat 402 drives the sliding block 403 to slide along the sliding groove 404, since the buffer box 4 is filled with the damping filler 401, the filler can effectively limit the movement speed of the sliding block 403 and the buffer rod 405, forms a damping effect, and further absorbs vibration, in addition, the damping filler 401 completely wraps the sliding block 403, the buffer rod 405 and the connecting block 407, and the damping filler 401 is of liquid silicone rubber material, and the liquid silicone rubber characteristics further enhance the vibration suppression effect of the buffer box 4;

[0034] According to Figures 1 to 3 When the buffer box 4 absorbs part of the vibration, the remaining vibration is transmitted downward to the buffer plate 3 and the bottom of the buffer box 4, at this time, the damping spring 2 at the bottom of the buffer plate 3 further attenuates the vibration, at the same time, the vibration at the bottom of the buffer box 4 is transmitted to the viscous damper 102 through the second connecting piece 103, the viscous damper 102 absorbs the remaining vibration, finally, the vibration is conducted to the composite damping plate 1 through the first connecting piece 101, since the composite damping plate 1 adopts a metal-rubber sandwich structure, combines the rigidity of metal and the damping characteristics of rubber, effectively absorbs wideband vibration, further reduces the vibration amplitude, the viscous damper 102 is the existing technology in the market, and will not be described in detail here.

[0035] The above is the working process of the whole device, and the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0036] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A composite damping device for suppressing vibration of a steam turbine rotor, comprising a composite damping plate (1), a buffer plate (3) and a buffer cover (5); characterized in that: The top of the composite damping plate (1) is fixedly connected with a damping spring (2), one end of the damping spring (2) away from the composite damping plate (1) is fixedly connected to the bottom of the buffer plate (3), the inner side wall of the buffer plate (3) is fixedly connected with a buffer box (4), the buffer cover (5) is slidingly connected to the inner side wall of the buffer box (4), the buffer cover (5) is located near the top of the buffer box (4), and the top of the buffer cover (5) is fixedly connected with a connecting plate (6).

2. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 1, characterized in that: The composite damping plate (1) is a metal-rubber sandwich structure, the damping spring (2) is symmetrically installed at the four corners of the top of the composite damping plate (1), and the buffer box (4) is located near the top of the buffer plate (3).

3. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 1, characterized in that: The top of the composite damping plate (1) is fixedly connected with a first connecting piece (101), the first connecting piece (101) is symmetrically installed at a position close to the damping spring (2), and the inner side wall of the first connecting piece (101) is fixedly connected with a viscous damper (102).

4. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 3, characterized in that: One end of the viscous damper (102) away from the first connecting piece (101) is fixedly connected with a second connecting piece (103), the second connecting piece (103) is fixedly connected to the bottom of the buffer box (4), and the second connecting piece (103) is symmetrically installed at the four corners of the bottom of the buffer box (4).

5. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 1, characterized in that: The inside of the buffer box (4) is filled with a damping filler (401), the inside of the buffer box (4) is provided with a sliding groove (404), the sliding grooves (404) are symmetrically distributed at positions close to the bottom of the buffer box (4), the inside of the sliding groove (404) is slidingly connected with a sliding block (403), the top of the sliding block (403) is fixedly connected with a sliding seat (402), and the sliding seat (402) is slidingly connected to the inside of the buffer box (4).

6. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 5, characterized in that: The inner side wall of the sliding seat (402) is rotatably connected with a buffer rod (405), one end of the buffer rod (405) away from the sliding seat (402) is rotatably connected with a connecting seat (406), the outer side wall of the connecting seat (406) is fixedly connected with a connecting block (407), the connecting seat (406) is symmetrically installed on the outer side wall of the connecting block (407), and the connecting block (407) is fixedly connected to one side of the buffer cover (5) away from the connecting plate (6).

7. A combined damping device for suppressing vibration of a steam turbine rotor according to claim 1, characterized in that: The top of the connecting plate (6) is fixedly connected with a rubber pad (601), the top of the rubber pad (601) is fixedly connected with a connecting bolt (602), the connecting bolts (602) are symmetrically installed at the top of the rubber pad (601), the outer side wall of the connecting bolt (602) is rotatably connected with a connecting nut (603), and the connecting nut (603) is rotatably connected to the top of the rubber pad (601).

Images