Vibration reduction structure and method applied to power transmission line

Abstract

The invention relates to the field of anti-galloping vibration reduction of power transmission engineering, in particular to a vibration reduction structure and a method applied to a power transmission line, and the vibration reduction structure comprises a shell, a movable part at least partially located in the shell, and a viscoelastic part arranged between the shell and the movable part; the movable part can move relative to the shell, when the movable part and the shell move relatively, the viscoelastic part deforms to provide damping force, the vibration reduction structure is installed in the power transmission line, when the power transmission line swings or vibrates, the pull rod and the shell move relatively, the viscoelastic layer is subjected to shear deformation, and energy is dissipated. The vibration amplitude of the power transmission line is reduced; when the amplitude of waving or vibration is further increased, the relative displacement between the pull rod and the shell is further increased, and the piston extrudes the viscoelastic balls, so that the viscoelastic balls generate extrusion deformation and mutual friction, energy is dissipated, and the amplitude of vibration is reduced.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and anti-vibration in power transmission engineering, and in particular to a vibration reduction structure and a method for applying it to power transmission lines. Background Technology

[0002] A safe and stable power system is an important guarantee for national economic development and industrial operation. As the core artery of the power system, the operation status of overhead transmission lines is directly related to the overall safety of the power grid. However, in many parts of my country, due to special geographical and meteorological conditions, transmission lines are prone to icing in winter. When the temperature rises or the line load current generates heat, the ice on the conductors will suddenly fall off. The resulting impact load can easily induce large-amplitude, low-frequency galloping of the conductors. At the same time, the conductors after icing will also produce a galloping effect under the action of wind due to the change in aerodynamic characteristics.

[0003] This continuous conductor galloping is extremely dangerous. At best, it causes a sudden reduction in phase-to-phase electrical clearance, leading to phase-to-phase flashover and short-circuit tripping; at worst, it causes hardware wear, conductor fatigue breakage, and even damage to tower components or tower collapse, posing a significant threat to power grid safety. Therefore, it is necessary to adopt certain technical measures to suppress the galloping effect of transmission lines caused by ice shedding or wind loads, ensuring the safe operation of transmission lines. Currently, some measures have been taken to control the impact of transmission line galloping, such as installing anti-galloping devices and double-pendulum anti-galloping devices on transmission lines, installing guy-wire anti-galloping devices on transmission lines, and installing damping devices on transmission towers. These methods can mitigate the impact of transmission line galloping on its operation to some extent, but problems such as low damping, weak energy dissipation capacity, and susceptibility to fatigue damage still exist, affecting their effectiveness in suppressing transmission line galloping. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that existing anti-galling devices are prone to adverse deformation, lack energy dissipation capacity, and are prone to fatigue leading to damage to connecting hardware.

[0005] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a vibration damping structure, which includes a housing, a movable member located at least partially within the housing, and a viscoelastic member disposed between the housing and the movable member; and the movable member is movable relative to the housing, and when the movable member and the housing undergo relative displacement, the viscoelastic member deforms to provide damping force.

[0006] In a preferred embodiment of the vibration reduction structure of the present invention: the outer wall of the housing is provided with a slot, and the movable component includes a pull rod that is movably engaged with the slot.

[0007] In a preferred embodiment of the vibration reduction structure of the present invention: the viscoelastic element includes a viscoelastic layer disposed inside the housing, and a through hole is provided through the viscoelastic layer, the pull rod passes through the through hole, and the rod diameter of the pull rod located on both sides of the through hole is larger than the diameter of the through hole.

[0008] In a preferred embodiment of the vibration reduction structure of the present invention: a groove is provided on the inner wall of the housing, and a protrusion is provided on the viscoelastic layer, and the groove and the protrusion are engaged in a snap-fit ​​relationship.

[0009] In a preferred embodiment of the vibration reduction structure of the present invention: the tie rod is divided into a first rod body and a second rod body, and the first rod body passes through a through hole and is threadedly connected to the second rod body.

[0010] In a preferred embodiment of the vibration damping structure of the present invention: the movable member further includes a piston slidably disposed within the housing; an accommodating space is formed between the piston and the side wall of the housing, and the accommodating space is filled with viscoelastic balls.

[0011] In a preferred embodiment of the vibration damping structure of the present invention: the piston is provided with a movable groove, and the movable groove is movably engaged with the pull rod, and the outer wall of the pull rod is sleeved with an elastic element.

[0012] In a preferred embodiment of the vibration reduction structure of the present invention: the shell is divided into two parts, the outer wall of the shell is provided with a flange structure, and the shell is assembled and fixed by bolts.

[0013] In a preferred embodiment of the vibration reduction structure of the present invention: a first connecting plate is provided at one end of the tie rod located outside the housing, and a second connecting plate is provided on the outer wall of the housing.

[0014] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a method for use in transmission lines, which includes that the first connecting plate and the second connecting plate in the vibration reduction structure are respectively connected to two components in the transmission line that will generate relative displacement.

[0015] The beneficial effects of this invention are as follows: When the vibration damping structure is installed in the power transmission line, when the power transmission line gallops or vibrates, relative movement occurs between the tie rod and the housing, causing shear deformation of the viscoelastic layer, dissipating energy, and thus reducing the vibration amplitude of the power transmission line; when the galloping or vibration amplitude further increases, the relative displacement between the tie rod and the housing further increases, and the piston squeezes the viscoelastic ball, causing the viscoelastic ball to be squeezed and deformed and to rub against each other, dissipating energy and reducing the vibration amplitude. The overall device is low-carbon and green. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the overall connection of the vibration reduction structure is shown; Figure 2 A schematic diagram of the connection structure of the moving parts is shown; Figure 3 A schematic diagram of the tie rod connection structure is shown; Figure 4 A schematic diagram of the housing connection structure is shown; Figure 5 This diagram illustrates one application of vibration damping structures. Figure 6 This diagram illustrates one application of vibration damping structures. Figure 7 The diagram shows hysteresis curves at different amplitudes and frequencies; Figure 8 The graphs showing the changes in equivalent stiffness and equivalent damping with frequency and displacement are shown. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0019] Reference Figures 1-4 This embodiment provides a vibration damping structure, including a housing 1, a movable member 2 located at least partially within the housing 1, and a viscoelastic member 3 disposed between the housing 1 and the movable member 2; and the movable member 2 is movable relative to the housing 1, and when the movable member 2 and the housing 1 undergo relative displacement, the viscoelastic member 3 deforms to provide damping force.

[0020] The viscoelastic element 3 is made of a high-damping viscoelastic material with a loss factor of 0.5 to 1, which is vulcanized under high temperature and high pressure. The shell 1 is preferably cylindrical, with an internal accommodating space. The viscoelastic element 3 is disposed in the accommodating space of the shell 1. Of course, in this case, it is not excluded that other shapes of shell 1 can be used.

[0021] Furthermore, the movable part 2 is connected to a component that will vibrate or sway. When the movable part 2 is pulled or squeezed by the component, it will move relative to the housing 1. When the relative displacement occurs between the housing 1 and the movable part 2, the viscoelastic component 3 provided in the housing 1 can then buffer the vibration.

[0022] In one embodiment provided in this application, the outer wall of the housing 1 is provided with a slot 11, and the movable part 2 includes a pull rod 21 that is movably engaged with the slot 11. The slot 11 is preferably located at the center of one side wall of the housing 1.

[0023] In one embodiment provided in this application, the viscoelastic member 3 includes a viscoelastic layer 31 disposed inside the housing 1, and a through hole 311 is provided through the viscoelastic layer 31. The pull rod 21 passes through the through hole 311, and the rod diameter of the pull rod 21 on both sides of the through hole 311 is larger than the hole diameter of the through hole 311, preferably larger than 5~10mm.

[0024] The viscoelastic layer 31 is preferably disposed in the middle of the shell 1 and has a symmetrical structure. In terms of the cross-sectional area of ​​the upper or lower half, the viscoelastic layer 31 has a shape that is wide at both ends and narrow in the middle. This arrangement can reduce the shear area, and under the same conditions, the stiffness of the device will be reduced.

[0025] In one embodiment provided in this application, a groove 12 is provided on the inner wall of the housing 1, and a protrusion 312 is provided on the viscoelastic layer 31, and the groove 12 and the protrusion 312 are engaged.

[0026] The groove 12 is preferably annular, and the size and shape of the protrusion 312 are adapted to the groove 12. The housing 1 is preferably provided with two grooves 12 symmetrically, which are further used to install and fix the viscoelastic layer 31.

[0027] In one embodiment provided in this application, the pull rod 21 is divided into a first rod body 211 and a second rod body 212, and the first rod body 211 passes through the through hole 311 and is threadedly connected to the second rod body 212.

[0028] Among them, such as Figure 1 , Figure 2 As shown, one end of the second rod 212 can pass through the through hole 311 and be threaded to one end of the first rod 211, and the viscoelastic layer 31 is tightened and fixed in the middle.

[0029] In one embodiment provided in this application, the movable component 2 further includes a piston 22 slidably disposed within the housing 1; an accommodating space 12 is formed between the piston 22 and the side wall of the housing 1, and the accommodating space 12 is filled with viscoelastic balls 32, the diameter of which is preferably 3~10mm.

[0030] Furthermore, in this case, the viscoelastic sphere 32 is preferably configured as a bead shape, filling the accommodating space 12. Of course, alternative solutions such as a square or other shapes are not excluded.

[0031] Preferably, there are two pistons 22 arranged symmetrically around the viscoelastic layer 31 as the axis, and such... Figure 1 As shown, the two pistons 22 respectively form two accommodating spaces 12 with the opposite sidewall of the adjacent housing 1.

[0032] In one embodiment provided in this application, the piston 21 is provided with a movable groove 211, and the movable groove 211 is movably engaged with the pull rod 21, and the outer wall of the pull rod 21 is sleeved with an elastic element 213.

[0033] In this configuration, the elastic element 213 is preferably a spring, and both ends of the pull rod 21 are respectively movably engaged with the movable groove 211; for example... Figure 1 As shown, the diameter of the pull rod 21, which is a certain distance away from the end face of the piston 21 (the actual reserved distance can be adjusted according to the displacement stroke of the component, such as the anti-galling and vibration damping device used in power transmission lines), is larger than the groove diameter of the movable groove 211, and the elastic element 213 is located in the middle of the larger diameter of the piston 21 and the pull rod 21.

[0034] Furthermore, by setting the elastic element 213, the force output can be more continuous when the housing 1 and the tie rod 21 are in different displacements, avoiding sudden impact and accelerating the wear of the vibration damping device; and this setting can ensure that when the housing 1 and the tie rod 21 are in large displacement, the viscoelastic ball 32 is squeezed to produce a limiting effect, thereby preventing the viscoelastic layer 31 from deforming and being damaged, thus ensuring the stability of the device.

[0035] In one embodiment provided in this application, the housing 1 is divided into two parts, the outer wall of the housing 1 is provided with a flange structure, and the housing 1 is assembled and fixed by bolts.

[0036] The design of dividing the housing 1 into two parts facilitates the disassembly and maintenance of the overall vibration damping device. In addition, the groove 12 is preferably set at the dividing point of the housing 1, which facilitates the installation or replacement of the easily worn viscoelastic layer 31 and viscoelastic ball 32 after long-term use. The overall device is low-carbon and green.

[0037] In one embodiment provided in this application, the end of the pull rod 21 located outside the housing 1 is provided with a first connecting plate 214, and the outer wall of the housing 1 is provided with a second connecting plate 13.

[0038] The first connecting plate 214 is preferably connected to the pull rod 21 by threads, and the second connecting plate 13 can be connected to the housing 1 by integral molding or welding.

[0039] In summary, when the vibration damping device is used, when the housing 1 and the tie rod 21 move relative to each other, the viscoelastic layer 31 is first driven to undergo shear deformation, which in turn generates heat and consumes energy. When the relative displacement between the housing 1 and the tie rod 21 increases further, the tie rod 21 pushes the piston 22 on one side through the elastic element 213. The piston 22 squeezes the viscoelastic ball 32, and the balls rub against each other and deform by compression, thereby generating heat and consuming energy.

[0040] Reference Figures 5-6 This embodiment provides a method for use in power transmission lines, including a first connecting plate 214 and a second connecting plate 13 in a vibration damping structure, which are respectively connected to two components in the power transmission line that will generate relative displacement; for example, it can be applied to components such as phase spacers, rope anti-galloping devices, and power transmission towers to suppress galloping or vibration amplitude.

[0041] In one embodiment provided in this application, the vibration damping structure can be combined with a common phase-to-phase spacer. One end of the connecting plate is fixed to one end of the phase-to-phase spacer with bolts, and the other end of the connecting plate is fixed to hardware such as wire clamps and adjusting plates. This improves the energy dissipation capacity of the phase-to-phase spacer, forming a high-damping anti-galloping vibration damping spacer. These spacers are then installed between different phase lines to effectively suppress the galloping of the transmission line.

[0042] Specifically, such as Figure 6 As shown, X represents a vibration damping device. In use, the second connecting plate 13 is connected to one end of the insulator, and the first connecting plate 214 is connected to hardware such as wire clamps or adjusting plates to form a high-damping phase-to-phase spacer. This spacer is installed between different phase lines of the transmission line or between a phase line and the ground line. When the transmission line gallops, the two ends of the phase-to-phase spacer will move relative to each other, which will cause the energy-consuming material in the transmission line anti-galloping vibration damping device to deform and consume energy, thereby dissipating the galloping energy of the transmission line and suppressing its galloping amplitude.

[0043] In one embodiment provided in this application, the vibration damping structure can be combined with the rope anti-galling device. One end of the connecting plate is fixed to one end of the rope anti-galling device, and the other end of the connecting plate is fixed to the ground or foundation. The high-damping vibration damping device for power transmission lines can buffer the impact force of the power transmission line jumping suddenly on the rope anti-galling device, and at the same time increase the energy dissipation capacity of the anti-galling device, effectively suppressing the galloping of the power transmission line.

[0044] Specifically, such as Figure 5 As shown, X is a vibration damping device. The second connecting plate 13 is fixed to one end of the pull rope anti-galloping device, and the first connecting plate 214 is fixed to the foundation, forming a high-damping pull rope anti-galloping device. It is installed between the phase line of the transmission line and the foundation. When the transmission line gallops, the pull rope anti-galloping device causes the energy-consuming material in the transmission line anti-galloping vibration damping device to deform and consume energy, dissipating the galloping energy of the transmission line and suppressing its galloping amplitude.

[0045] In one embodiment provided in this application, a vibration damping structure can be installed on a transmission tower, and the first connecting plate 214 and the second connecting plate 13 can be fixed to the nodes of the transmission tower with large relative movement, which can suppress the vibration of the transmission tower caused by transmission line galloping, wind load, etc.

[0046] Specifically, the second connecting plate 13 is fixed to the node of the transmission tower, and the first connecting plate 214 is fixed to the adjacent node of the transmission tower. When the transmission tower vibrates, the different nodes generate relative displacement, which causes the energy-consuming material in the transmission line anti-galling and vibration reduction device to deform and consume energy, dissipating the vibration energy of the transmission tower and suppressing its vibration amplitude.

[0047] Reference Figures 7-8 This embodiment provides an analytical experiment on a vibration reduction structure. To understand the mechanical performance and energy dissipation capacity of the designed device under different frequencies and displacement conditions, a dynamic mechanical performance test was conducted. The test used a fatigue testing machine and employed a sinusoidal displacement loading method. Through a data acquisition system, force and displacement data of the device were collected during the loading process, and force-displacement hysteresis curves under different working conditions were plotted using graphing software. Some representative curves are shown below. Figure 7 As shown. The test displacement amplitudes were 4mm, 6mm, 8mm, 10mm, and 12mm; the test frequencies were 0.1Hz, 0.5Hz, 1Hz, 2Hz, and 5Hz. The hysteresis curves show that the device's hysteresis curves are relatively full, indicating good energy dissipation capability. Energy dissipation increases with larger displacement amplitudes. Furthermore, both the loading frequency and displacement amplitude affect the device's mechanical properties. The device's mechanical properties, such as stiffness and damping, are significantly affected by the frequency. Figure 8 As shown.

[0048] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A vibration damping structure, characterized in that: The vibration damping structure includes a housing (1), a movable member (2) at least partially located within the housing (1), and a viscoelastic member (3) disposed between the housing (1) and the movable member (2); and, The movable part (2) can move relative to the housing (1), and when the movable part (2) and the housing (1) are relatively displaced, the viscoelastic part (3) deforms to provide damping force.

2. The vibration reduction structure according to claim 1, characterized in that: The outer wall of the housing (1) is provided with a slot (11), and the movable part (2) includes a pull rod (21) that is movably engaged with the slot (11).

3. The vibration reduction structure according to claim 2, characterized in that: The viscoelastic element (3) includes a viscoelastic layer (31) disposed inside the housing (1), and a through hole (311) is provided in the viscoelastic layer (31). The pull rod (21) passes through the through hole (311), and the rod diameter of the pull rod (21) on both sides of the through hole (311) is larger than the diameter of the through hole (311).

4. The vibration reduction structure according to claim 3, characterized in that: The inner wall of the housing (1) is provided with a groove (12), and the viscoelastic layer (31) is provided with a protrusion (312), and the groove (12) and the protrusion (312) are engaged.

5. The vibration reduction structure according to claim 4, characterized in that: The pull rod (21) is divided into a first rod body (211) and a second rod body (212), and the first rod body (211) is threadedly connected to the second rod body (212) through the through hole (311).

6. The vibration reduction structure according to any one of claims 2 to 5, characterized in that: The movable part (2) further includes a piston (22) slidably disposed in the housing (1); a receiving space (12) is formed between the piston (22) and the side wall of the housing (1), and the receiving space (12) is filled with viscoelastic balls (32).

7. The vibration reduction structure according to claim 6, characterized in that: The piston (21) has a movable groove (211) and the movable groove (211) is in movable cooperation with the pull rod (21), and the outer wall of the pull rod (21) is fitted with an elastic element (213).

8. The vibration reduction structure according to claim 7, characterized in that: The shell (1) is divided into two parts. The outer wall of the shell (1) is provided with a flange structure, and the shell (1) is assembled and fixed by bolts.

9. The vibration reduction structure according to any one of claims 2 to 5, 7 or 8, characterized in that: The pull rod (21) has a first connecting plate (214) at one end outside the housing (1), and a second connecting plate (13) is provided on the outer wall of the housing (1).

10. A method applied to transmission lines, characterized in that: Including the vibration reduction structure according to any one of claims 1 to 9; and, The first connecting plate (214) and the second connecting plate (13) in the vibration reduction structure are respectively connected to two components in the transmission line that will generate relative displacement.

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