A steel pipe lightning rod vibration control eddy current tuned mass damper

Abstract

The application provides a steel pipe lightning rod vibration control eddy current tuned mass damper, characterized by comprising a top fixing unit (2), a bottom fixing unit (3) and a plurality of damping components (4) arranged between the top fixing unit and the bottom fixing unit, the top fixing unit is sleeved on the top end of a lightning rod (1) and connected with a dust cover at the top of the lightning rod, each damping component is provided with a magnetic damping structure, and the magnetic damping structure converts vibration energy into eddy current when the lightning rod vibrates. Compared with the prior art, the application has the advantages of good effect on preventing vortex vibration of the steel pipe lightning rod, no need of external active energy, small initial friction, convenient installation and construction by sleeving on the top of the steel pipe lightning rod.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of wind-induced vibration control of electric power engineering, and particularly relates to a steel pipe lightning rod vibration control eddy current tuned mass damper. BACKGROUND

[0002] Because the lightning rod is an important part of the substation and plays an important role in lightning protection of the substation, in order to avoid important electrical equipment in the substation from being damaged by lightning, a lightning rod is usually erected in the substation. The lightning rod usually adopts an independent steel pipe style, which is convenient to design, process and install, and is widely used. However, the lightning rod of the independent steel pipe style also has its shortcomings. When the wind blows through the steel pipe lightning rod, alternating vortexes are generated at the back of the steel pipe lightning rod, the vortexes produce crosswind and vortex shedding force upward. When the frequency of vortex shedding is close to the natural frequency of the steel pipe lightning rod, resonance phenomenon occurs, which is called "vortex-induced vibration" in engineering. This high-frequency reciprocating vibration may cause the steel pipe lightning rod to be damaged by vibration fatigue, and in severe cases, may cause the steel pipe lightning rod to break or even collapse.

[0003] At present, the main measure to suppress the wind-induced vibration of the steel pipe lightning rod is aerodynamic control, which mainly disturbs the regular shedding of vortexes by changing the aerodynamic shape of the steel pipe lightning rod, so as to avoid the occurrence of vortex vibration, and is a measure to solve the vortex vibration fatigue of the steel pipe lightning rod. The main implementation means include: arranging rectangular spoiler plates, winding spiral lines or wrapping outer clothes with spiral ribs at certain angle intervals and spacings along the pipe body outside the independent steel pipe lightning rod, and arranging staggered fish fin plates.

[0004] The aerodynamic measure can suppress the vortex-induced resonance of the steel pipe lightning rod to a certain extent, but a large number of spoilers or other devices need to be arranged along the pipe body, which will increase the wind area and increase the wind load, affect the overall structural strength of the steel pipe lightning rod, and the large number of spoilers will affect the appearance.

[0005] In order to solve the problem that when the wind blows through the steel pipe lightning rod, the frequency of vortex shedding is close to the natural frequency of the steel pipe lightning rod, prevent the resonance phenomenon from occurring, avoid the "vortex-induced vibration" of the steel pipe lightning rod causing vibration fatigue and leading to damage, and avoid the wind area near the pipe body of the steel pipe lightning rod from being excessively increased, reduce the wind load, reduce the influence on the overall structural strength of the steel pipe lightning rod, and enhance the appearance around the steel pipe lightning rod. SUMMARY

[0006] In order to solve the vortex vibration problem of the steel lightning rod 1, the application provides a steel lightning rod vibration control electric eddy current tuned mass damper, when the steel lightning rod 1 produces vibration under the action of wind load, the tuned mass damper is driven to vibrate together. The tuned mass damper is installed at the top of the steel lightning rod 1, and the damping inertia force generated by the tuned mass damper acts on the steel lightning rod 1, so that the tuned mass damper plays a tuning role on the vibration of the main structure of the steel lightning rod 1, thereby weakening the vibration intensity of the overall structure of the steel lightning rod 1. The application comprises a top fixing unit 2, a bottom fixing unit 3 and a plurality of vibration reduction assemblies 4 arranged between the top fixing unit 2 and the bottom fixing unit 3, the top fixing unit 2 is sleeved on the top end of the lightning rod 1 and connected with the dust cover at the top of the lightning rod 1; each vibration reduction assembly 4 is provided with a magnetic damping structure; when the lightning rod 1 vibrates, the magnetic damping structure converts vibration energy into electric eddy current.

[0007] Preferably, the magnetic damping structure comprises a suspender 18, a magnet 19 and a copper block 20,

[0008] The suspender 18 is a rod-shaped structure;

[0009] The magnet 19 is provided with a through hole, and the through hole of the magnet 19 is connected and fixed with the lower end of the suspender 18;

[0010] The copper block 20 is arranged below the magnet 19 and has a distance from the magnet 19.

[0011] Preferably, the vibration reduction assembly 4 further comprises a cylinder 17, and the magnetic damping structure is arranged in the cylinder 17;

[0012] The top end of the cylinder 17 is connected with the top fixing unit 2, and the bottom end of the cylinder 17 is connected with the bottom fixing unit 3;

[0013] The upper end of the suspender 18 is fixed to the top end inside the cylinder 17, and the copper block 20 is fixed to the bottom end inside the cylinder 17.

[0014] Preferably, the length of the suspender 18 is smaller than the length of the cylinder 17, and the length of the suspender 18 is determined according to the wind strength, the vibration frequency of the lightning rod 1 and the support force that can be borne.

[0015] Preferably, the shape, size and mass of the magnet 19 are set according to the vibration frequency of the lightning rod 1, the length of the suspender 18 and the distance between the magnet 19 and the copper block 20.

[0016] Preferably, the vibration reduction assembly 4 is four, surrounds the lightning rod 1, is symmetrically arranged and controls the four-order vibration of the lightning rod 1 through the vibration reduction assembly 4.

[0017] Preferably, the top fixing unit 2 is a conical cap-shaped structure, the bottom of which is provided with a sleeve 7, which is a circular ring-shaped sleeve plate in a circular ring structure.

[0018] Preferably, the tip of the cap-shaped structure is a top cap 5, which is attached to and fixedly connected to the outside of the dust cover of the lightning rod 1, and the lower end of the top cap 5 and the edge of the outer ring of the sleeve 7 are further provided with a diagonal pull rod 6.

[0019] Preferably, the bottom fixing unit 3 is a ring-shaped structure, and the bottom of the vibration reduction assembly 4 is connected and fixed at the edge of the ring-shaped structure, and the center of the ring-shaped structure is provided with a fastening sleeve ring 14.

[0020] Preferably, the fastening sleeve ring 14 is a cylindrical structure with open ends, and the inner side of the cylindrical structure is connected and fixed with the lightning rod 1.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] The present application provides a steel pipe lightning rod vibration control eddy current tuned mass damper, which comprises a top fixing unit 2, a bottom fixing unit 3 and a plurality of vibration reduction assemblies 4 arranged between the top fixing unit 2 and the bottom fixing unit 3, the top fixing unit 2 is sleeved on the top end of the lightning rod 1 and connected with the top dust cover of the lightning rod 1; each vibration reduction assembly 4 is provided with a magnetic damping structure; when the lightning rod 1 vibrates, the magnetic damping structure converts the vibration energy into eddy current. Compared with the prior art, the present application has good effect on preventing vortex vibration of the steel pipe lightning rod, does not need to provide external active energy, has very small initial friction, is sleeved on the top of the steel pipe lightning rod, and is convenient to install and construct. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The present application provides a steel pipe lightning rod vibration control eddy current tuned mass damper structure front view schematic diagram;

[0024] Figure 2 The present application provides a top fixing device structure front view schematic diagram;

[0025] Figure 3 The present application provides a sleeve structure plan view schematic diagram;

[0026] Figure 4 The present application provides a bottom fixing device structure plan view schematic diagram;

[0027] Figure 5 The present application provides a bottom fixing device structure front view schematic diagram;

[0028] Figure 6 The present application provides a vibration reduction assembly structure front view schematic diagram;

[0029] Figure 7 A front view of a derrick structure according to the present application;

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1- lightning rod; 2- top fixing unit; 3- bottom fixing unit; 4- damping assembly; 5- top cap; 6- inclined pull rod; 7- clamping sleeve; 8- first circular ring; 9- first connecting rod; 10- first sleeve ring; 11- first circular hole; 12- second circular ring; 13- second connecting rod; 14- fastening sleeve ring; 15- second circular hole; 16- threaded hole; 17- cylinder; 18- derrick; 19- magnet; 20- copper block; 21- first nut; 22- second nut; 23- bolt; 24- third nut. DETAILED DESCRIPTION

[0032] For the vortex vibration problem of the steel pipe lightning rod, the present application provides a steel pipe lightning rod vibration control electric eddy current tuned mass damper. When the steel pipe lightning rod 1 is vibrated under the action of wind load, the tuned mass damper is vibrated together. The tuned mass damper is installed at the top of the steel pipe lightning rod 1, and the magnetic damping structure inertia force generated by the tuned mass damper acts on the steel pipe lightning rod 1, so that the vibration of the steel pipe lightning rod 1 main structure is tuned, thereby reducing the vibration intensity of the whole structure of the steel pipe lightning rod 1. The present application comprises a top fixing unit 2, a bottom fixing unit 3 and a plurality of damping assemblies 4 arranged between the top fixing unit 2 and the bottom fixing unit 3, the top fixing unit 2 is sleeved on the top end of the lightning rod 1 and connected with the dust cover at the top of the lightning rod 1; each damping assembly 4 is provided with a magnetic damping structure; when the lightning rod 1 is vibrated, the magnetic damping structure converts the vibration energy into electric eddy current.

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be clearly described below in combination with the drawings in the embodiments of the present application.

[0034] Embodiment 1:

[0035] In the present application, as Figure 1As shown, the present application provides a steel lightning rod vibration control eddy current tuned mass damper, comprising a top fixing unit 2, a bottom fixing unit 3 and a damping unit 4, the top fixing unit 2 is sleeved on the top end of the lightning rod 1 and connected with the top dust cover of the lightning rod 1; the bottom fixing unit 3 is a circular ring structure, and the central part is connected with the lightning rod 1; the damping unit 4 comprises a plurality of cylindrical damping components, a magnetic damping system is arranged in the damping component, the damping component surrounds the lightning rod 1, and is fixedly connected between the top fixing unit 2 and the bottom fixing unit 3, the first four order vibrations of the lightning rod 1 are controlled by adjusting the setting of each set of damping system, the tuned damping effect is adopted, the lightning rod 1 vibration is converted into magnetic field line damping cutting in the magnetic damping system, and the lightning rod 1 vibration is converted into heat energy dissipation and released by eddy current.

[0036] In the present application, the damping system composed of the damping component and the lightning rod 1 have at most five features, i.e., the distance from the lightning rod 1, the height of the body, the lateral size of the body, the weight of the body and the position relationship of the body and the outside.

[0037] In the present application, the damping system composed of the damping component can be configured in small size according to the vibration intensity of the lightning rod 1, and the magnetic damping system composed of the damping component also produces damping effect and dissipates the micro-vibration intensity of the lightning rod 1 in the case of micro-vibration of the lightning rod 1.

[0038] In the present application, as shown, Figure 6 The damping component comprises a cylinder 17, a suspender 18, a magnet 19, a copper block 20, a bolt 23 and a third nut 24, as shown, Figure 7 The suspender 18 is a cylindrical rod, and round pads are arranged at both ends, respectively, and the outer threads are arranged from the pads to the ends of the suspender 18, the round pad at the upper end of the suspender 18 is larger than that at the lower end, and the thread segment at the upper end of the suspender 18 is longer than that at the lower end.

[0039] The copper block 20 is a cylindrical rod, and is fixed to the inner wall of the cylinder 17 at the lower end, and a through hole is arranged on the axis of the copper block 20;

[0040] The cylinder 17 is a cylindrical hollow cylinder with a closed top end, and a small hole is arranged at the center of the closed top end, and the upper end of the suspender 18 penetrates the small hole at the top end of the cylinder 17 and the edge part of the top fixing unit 2 in sequence, and is fixedly connected with the edge part of the top fixing unit 2;

[0041] The bolt 23 penetrates the through hole of the copper block 20 and the bottom end of the cylinder 17 in sequence, and is connected to the edge part of the bottom fixing unit 3 through the third nut 24;

[0042] The magnet 19 is a cylinder with a radius smaller than the inner diameter of the cylinder 17, and a hole is arranged along the central axis of the body of the magnet 19, and the threaded section of the lower end of the suspender 18 penetrates the hole of the magnet 19 and is fixedly connected with the magnet 19 through the second nut 22.

[0043] In the present application, the length of the suspender 18 is set according to the wind strength, the vibration frequency range of the lightning rod 1, and the support force that the lightning rod 1 can bear.

[0044] In the present application, the length of the suspender 18 is smaller than the length of the cylinder 17, and the swing range of the suspender 18 is within the wall of the cylinder.

[0045] In the present application, the mass of the magnet 19 is set according to the wind strength, the material of the magnet, the bearing capacity of the suspender 17, the vibration frequency of the lightning rod 1, and the support force thereof.

[0046] In the present application, the copper block 20 is arranged at the lower end position of the inner wall of the cylinder 17, and the position of the copper block 20 in the cylinder 17 is set according to the length of the suspender 18 and the mass and magnetic strength of the magnet 19.

[0047] In the present application, as shown in Figure 2 The top fixing unit 2 includes a top hat 5, a diagonal pull rod 6, and a sleeve 7.

[0048] The top hat 5 is the conical tip of the conical hat-shaped structure of the top end of the top fixing unit 2, and is attached and fixedly connected to the outer side of the dust cover of the lightning rod 1.

[0049] The sleeve 7 is a circular ring-shaped sleeve plate at the bottom of the top fixing unit 2, and has a double-ring structure composed of a first circular ring 8 and a first sleeve ring 10, and the two rings are connected by a long rod, and a first circular hole 11 is arranged between the adjacent connecting rods of the outer ring.

[0050] The diagonal pull rod 6 is a strip-shaped long rod, one end of which is fixedly connected to the lower end of the top hat 5, and the other end is fixedly connected to the edge of the outer ring of the sleeve 7.

[0051] In the present application, the size of the top hat 5 matches the size of the dust cover at the top end of the lightning rod 1.

[0052] In the present application, the diagonal pull rod 6 is a plurality of rods, which are symmetrically distributed around the lightning rod 1.

[0053] In the present application, as shown in Figure 3 The sleeve 7 includes a first circular ring 8, a first connecting rod 9, and a first sleeve ring 10.

[0054] The first collar 10 is arranged on the lightning rod 1 and connected with the first circular ring 8 through the first connecting rod 9, the first circular ring 8 is provided with a plurality of first circular holes 11 symmetrically distributed on the circular ring, and the top of the damping assembly is fixedly connected to the first circular hole 11, wherein the diameter of the first collar 10 is smaller than the diameter of the first circular ring 8.

[0055] In the present application, as shown in Figure 4 and 5 The bottom fixing unit 3 includes a second circular ring 12, a second connecting rod 13, a fastening collar 14, a second circular hole 15 and a threaded hole 16, and the fastening collar 14 is a cylindrical barrel with open ends.

[0056] The fastening collar 14 is connected with the second circular ring 12 through the second connecting rod 13, the second circular ring 12 is provided with a plurality of second circular holes 15 symmetrically distributed on the circular ring, and the bottom of the damping assembly is fixedly connected to the second circular hole 15 of the second circular ring 12, wherein the diameter of the fastening collar 14 is smaller than the diameter of the second circular ring 12.

[0057] The fastening collar 14 is provided with a plurality of threaded holes 16 symmetrically distributed on the upper and lower sides of the second circular ring 12, and the threaded holes 16 are also symmetrically distributed on the circumference of the fastening collar 14, and the fastening collar 14 is fastened to the lightning rod 1.

[0058] Embodiment 2:

[0059] In the present application, a steel pipe lightning rod vibration control eddy current tuned mass damper is provided, and the damping assembly 4 is at least one layer in the radial direction around the lightning rod 1. As shown in Figures 1 to 6 and, when the damping assembly 4 is one layer, the damping assembly 4 is connected to the top fixing unit 2 through the sleeve 7 above the damping assembly 4, and is specifically connected to the outer circular ring of the sleeve 7, that is, the first circular hole 11 in the first circular ring 8, and is fixedly connected through the first nut 21; the bottom of the damping assembly 4 is connected to the second circular ring of the bottom fixing unit 3, and is specifically connected to the second circular hole 15 in the second circular ring 12, and is fixedly connected through the bolt 23 and the third nut 24, and the bottom fixing unit 3 is fixed to the lightning rod 1 through the threaded holes 16 provided on the fastening collar 14.

[0060] In the present application, when the damping assembly 4 is multiple layers in the radial direction around the lightning rod 1, the top end of the damping assembly 4 is fixed in the top fixing unit 2, and the bottom end of the damping assembly 4 is fixed in the bottom fixing unit 3, different circular ring radii are correspondingly provided according to different lengths in the radial direction, and the connecting rods are connected in the radial direction of the concentric circular rings on the same plane, and the connecting rods can be symmetrically arranged around the circular ring. The number of the connecting rods is consistent with the number of layers of the damping assembly 4.

[0061] In the present application, the circular annular multilayer damping assembly 4 is arranged in annular form from inside to outside in sequence and centered on the steel pipe lightning rod 1, which can be a circular ring or a rectangular ring, and is one-to-one corresponding and distributed around the lightning rod 1 on the top fixing unit 2 and the bottom fixing unit 3, and the bottom end of each damping assembly 4 is fixed on the bottom fixing unit 3.

[0062] In the present application, the structure size of the multilayer damping assembly 4 can be the same, or can be set according to actual needs, and each damping assembly 4 in each layer is fixed on the top fixing unit 2 and the bottom fixing unit 3.

[0063] Embodiment 3:

[0064] In the present application, the present application provides a steel pipe lightning rod vibration control eddy current tuned mass damper, and the damping assembly 4 is at least one layer in the longitudinal direction. Figures 1 to 6 As shown in the figure, when the damping assembly 4 is one layer, the damping assembly 4 is connected to the top fixing unit 2 through the sleeve 7 above the damping assembly 4, and is specifically connected to the outer circular ring of the sleeve 7, that is, the first circular hole 11 in the first circular ring 8, and is fixed through the first nut 21. The bottom of the damping assembly 4 is connected to the second circular ring of the bottom fixing unit 3, and is specifically connected to the second circular hole 15 in the second circular ring 12, and is fixed through the bolt 23 and the third nut 24. The bottom fixing unit 3 is fixed to the lightning rod 1 through the screw hole 16 arranged on the fastening sleeve ring 14.

[0065] In the present application, when the damping assembly 4 is multilayer, the number of bottom fixing units 3 is consistent with the number of damping assemblies 4; the multilayer damping assembly 4 and the plurality of bottom fixing units 3 are arranged in sequence from top to bottom and are one-to-one corresponding and distributed around the lightning rod 1, and the bottom end of each damping assembly 4 is fixed on the bottom fixing unit 3.

[0066] In the present application, the structure size of the multilayer damping assembly 4 can be the same, or can be set according to actual needs, and each damping assembly 4 in each layer is fixed on the bottom fixing unit 3.

[0067] Obviously, the described embodiments are part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0068] The word "exemplary" in this context means "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically indicated otherwise, the drawings attached hereto are not drawn to scale.

[0069] The above merely provides the implementation of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall fall into the protection scope of the present application.

Claims

1. A steel tube lightning rod vibration control eddy current tuned mass damper, characterized by, The utility model relates to a lightning rod damping device, including: Top fixed unit (2), bottom fixed unit (3) and be provided with multiple damping assembly (4) between top fixed unit (2), bottom fixed unit (3), The top fixed unit (2) is sleeved in the top end of lightning rod (1) and is connected with the dust cover of lightning rod (1) top, and the top fixed unit (2) is conical hat structure, the tip of the hat structure is top hat (5), and the top hat (5) is attached to and tightly connected to the outside of the dust cover of lightning rod (1). Each damping assembly (4) is provided with a magnetic damping structure, and when the lightning rod (1) vibrates, the magnetic damping structure converts vibration energy into eddy current; The damping assembly (4) is four, surrounds lightning rod (1) four, presents symmetric setting, and controls four order vibration of lightning rod (1) through damping assembly (4); The magnetic damping structure includes a boom (18), a magnet (19) and a copper block (20), The boom (18) is a rod structure; The magnet (19) is provided with a through hole, and the through hole of the magnet (19) is connected and fixed with the lower end of the boom (18); The copper block (20) is arranged below the magnet (19) and has a distance with the magnet (19); The shape and size and mass of the magnet (19) are set according to the vibration frequency of the lightning rod (1), the length of the boom (18) and the distance between the magnet (19) and the copper block (20).

2. The eddy current tuned mass damper of claim 1, wherein, The damping assembly (4) further includes a cylinder (17), and the magnetic damping structure is arranged in the cylinder (17); The top end of the cylinder (17) is connected with the top fixed unit (2), and the bottom end of the cylinder (17) is connected with the bottom fixed unit (3); The upper end of the boom (18) is fixed to the top end inside the cylinder (17), and the copper block (20) is fixed to the bottom end inside the cylinder (17).

3. The eddy current tuned mass damper of claim 2, wherein, The length of the boom (18) is less than the length of the cylinder (17), and the length of the boom (18) is determined according to the wind intensity, the vibration frequency of the lightning rod (1) and the support force that can be borne.

4. The eddy current tuned mass damper of claim 1, wherein, The bottom of the top fixed unit (2) is provided with a clamping sleeve (7), and the clamping sleeve (7) is a circular ring-shaped sleeve plate in a circular ring structure.

5. The eddy current tuned mass damper of claim 4, wherein, The lower end of the top hat (5) and the edge of the outer ring of the clamping sleeve (7) are further provided with a diagonal pull rod (6).

6. The eddy current tuned mass damper of claim 5, wherein, The bottom fixed unit (3) is an annular structure, the bottom of the damping assembly (4) is connected and fixed at the edge of the annular structure, and a fastening sleeve ring (14) is arranged at the center of the annular structure.

7. The eddy current tuned mass damper of claim 6, wherein, The fastening sleeve ring (14) is a cylindrical structure with open ends, and the inner side of the cylindrical structure is connected and fixed with the lightning rod (1).

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