Buffer device for overhead transmission conductor

Abstract

The utility model provides a buffer device used for an overhead transmission conductor. The buffer device comprises a first cylindrical housing, a second cylindrical housing and a damping member. Wherein one end of the first cylindrical shell is fixedly connected with an overhead transmission conductor, the second cylindrical shell is provided with a closed cavity, a liquid medium is arranged in the closed cavity, and the second cylindrical shell and the damping piece are connected in series in the axial direction of the first cylindrical shell and fixed in the first cylindrical shell. The radial size of the second cylindrical shell changes in the axial direction of the second cylindrical shell, and the radial size of the middle area of the second cylindrical shell is smaller than the radial size of the end area of the second cylindrical shell. Namely, the second cylindrical shell is in a thin waist shape with the thin middle and the two thick ends, in the process that the buffering device vibrates in the axial direction, a large number of liquid media pass through the middle area of the closed cavity for multiple times, so that turbulent flow is formed in the flowing process of the liquid media, the inherent frequency of vibration is changed and adjusted, and the effect of restraining vibration or absorbing vibration energy is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power grid disaster prevention, and particularly provides a buffer device for overhead transmission conductors. Background Art

[0002] When an overhead transmission conductor is subjected to a large-amplitude vertical impact, due to the combined influence of amplitude and frequency, this large-amplitude vertical impact is very likely to cause the risk of breakage of the overhead transmission conductor, thereby deteriorating the transmission and mechanical properties of the overhead transmission conductor and reducing the service life of the overhead transmission conductor.

[0003] How to effectively suppress the large-amplitude vertical impact vibration of overhead transmission conductors has become an urgent problem to be solved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a buffer device for overhead transmission conductors to overcome the problem of the difficulty in suppressing the large-amplitude vertical impact on overhead transmission lines.

[0005] The purpose of the utility model is achieved by adopting the following technical solutions:

[0006] The utility model provides a buffer device for overhead transmission conductors, which includes: a first cylindrical shell, one end of which is fixedly connected with the overhead transmission conductor; a second cylindrical shell, which has a sealed chamber, and a liquid medium is arranged in the sealed chamber; and a damping member; the second cylindrical shell and the damping member are connected in series along the axial direction of the first cylindrical shell and are fixed in the first cylindrical shell; the radial dimension of the second cylindrical shell changes along the axial direction of the second cylindrical shell, and the radial dimension of the middle area of the second cylindrical shell is smaller than the radial dimension of the end area of the second cylindrical shell.

[0007] Preferably, the radial side surface of the second cylindrical shell is radially contracted from the end area of the second cylindrical shell to the middle area of the second cylindrical shell to form a concave surface.

[0008] Preferably, the damping member includes: a third cylindrical shell, which is fixed on the inner end surface of the first cylindrical shell; a partition plate, which is located in the third cylindrical shell; damping blocks, which are located in the third cylindrical shell; and a movable rod, which passes through the third cylindrical shell and is slidably connected with the third cylindrical shell, one end of the movable rod is vertically fixed on the partition plate, and the other end of the movable rod is fixedly connected with the outer end of the second cylindrical shell; the number of the damping blocks is at least two, and the two damping blocks are distributed on both sides of the partition plate.

[0009] Preferably, the damping block includes metal rubber.

[0010] Preferably, the buffer device further includes a connecting support rod, one end of the connecting support rod is fixedly connected to the end of the second cylindrical shell, and the other end of the connecting support rod is fixedly connected to the movable rod.

[0011] Preferably, the buffer device further includes a helical spring, the helical spring is sleeved outside the connecting support rod, one end of the helical spring is fixedly connected to the end of the second cylindrical shell, and the other end of the helical spring is fixedly connected to the third cylindrical shell.

[0012] Preferably, the radial side surface of the first cylindrical shell is formed into a convex curved surface by radially expanding from the end region of the first cylindrical shell to the middle region of the first cylindrical shell.

[0013] Preferably, the first cylindrical shell includes an elastic metal shell.

[0014] Preferably, the buffer device further includes a mounting part, one end of the mounting part is fixed to one end of the first cylindrical shell, and the other end of the mounting part is fixedly connected to the overhead transmission line.

[0015] Preferably, the mounting part includes: a wire clamp head, one end of which is fixedly connected to the overhead transmission line; a connecting plate, which is fixed to the other end of the wire clamp head; a connecting seat, which is fixed to one end of the first cylindrical shell; and the connecting plate and the connecting seat are fixedly connected by bolts.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The buffer device for overhead transmission lines provided by the present invention includes a first cylindrical shell, a second cylindrical shell and a damping member. Among them, one end of the first cylindrical shell is fixedly connected to the overhead transmission line, the second cylindrical shell has a closed chamber, a liquid medium is arranged in the closed chamber, the second cylindrical shell and the damping member are connected in series along the axial direction of the first cylindrical shell and are fixed in the first cylindrical shell, and the radial dimension of the second cylindrical shell changes along the axial direction of the second cylindrical shell, and the radial dimension of the middle region of the second cylindrical shell is smaller than the radial dimension of the end region of the second cylindrical shell. Through such a setting, the second cylindrical shell has a waist shape with a thin middle and thick ends. During the axial vibration of the buffer device, the liquid medium needs to pass through the middle region of the closed chamber in multiple times, so that the liquid medium forms a turbulent flow during the flow process, avoiding the large synchronous flow of the liquid medium in the closed chamber, changing and adjusting the natural frequency of the vibration, and achieving the effect of suppressing vibration or absorbing vibration energy. In addition, the buffer device has a dual energy-consuming structure composed of the second cylindrical shell with a liquid medium and the damping member, which greatly improves the vibration reduction and buffering effect. Description of the Drawings

[0018] Figure 1 Schematic diagram of the structure of the first embodiment of the buffer device of the present utility model;

[0019] Figure 2 Schematic diagram of the structure of the second embodiment of the buffer device of the present utility model;

[0020] Figure 3 Schematic diagram of the structure of the damping member of the buffer device of the present utility model Figure 1 ;

[0021] Figure 4 Schematic diagram of the structure of the damping member of the buffer device of the present utility model Figure 2 。

[0022] Reference numerals: 1 - wire chuck; 2 - first cylindrical housing; 3 - second cylindrical housing; 4 - liquid medium; 5 - damping member; 51 - third cylindrical housing; 52 - partition plate; 53 - damping block; 54 - movable rod; 6 - connecting support rod; 7 - connecting seat; 8 - connecting plate; 9 - bolt; 10 - helical spring. Detailed implementation manners

[0023] The following describes the preferred implementation manners of the present utility model with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0024] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] Embodiment 1

[0026] As Figure 1As shown in the figure, the buffer device for overhead transmission conductors in the embodiment of the present utility model includes an installation part, a first cylindrical shell 2, a second cylindrical shell 3, and two damping members 5. Among them, the lower end of the installation part is fixed to the upper end of the first cylindrical shell 2, the upper end of the installation part is fixedly connected to the overhead transmission conductor, the second cylindrical shell 3 has a closed chamber, a liquid medium 4 is arranged in the closed chamber, the two damping members 5 are respectively fixed to the upper and lower ends of the second cylindrical shell 3, the second cylindrical shell 3 and the two damping members 5 are vertically connected in series along the axial direction of the first cylindrical shell 2 and are fixed inside the first cylindrical shell 2, and the radial dimension of the second cylindrical shell 3 changes along the axial direction of the second cylindrical shell 3, and the radial dimension in the middle area of the second cylindrical shell 3 is smaller than the radial dimension in the end area of the second cylindrical shell 3.

[0027] Specifically, as Figure 1 shown, the first cylindrical shell 2 of the buffer device in the embodiment of the present utility model is made of an elastic metal shell. The radial side surface of the first cylindrical shell 2 radially expands from the end area of the first cylindrical shell 2 to the middle area of the first cylindrical shell 2 to form a convex surface, that is, the middle area of the radial side surface of the first cylindrical shell 2 bulges outwards, and the first cylindrical shell 2 forms a drum-shaped structure with a protruding middle part. When the first cylindrical shell 2 bears axial vibration impact, the first cylindrical shell 2 absorbs part of the vibration impact energy through partial elastic deformation, thereby reducing the vibration energy and improving the bearing capacity and safety reliability of the buffer device. Among them, the two damping members 5 are respectively fixed to the top end and the bottom end on the inner side of the first cylindrical shell 2.

[0028] As Figure 1 shown, the radial side surface of the second cylindrical shell 3 of the buffer device in the embodiment of the present utility model radially contracts from the end areas on the upper and lower sides to the middle area to form a concave surface. That is, the radial side surface of the second cylindrical shell 3 is recessed inwards, so that the second cylindrical shell 3 forms a structure of a thin-waisted cylinder.

[0029] Among them, the liquid medium 4 is selected as dimethyl silicone oil as the damping medium, and the volume of the liquid medium 4 is 40%-60% of the volume of the closed chamber of the second cylindrical shell 3. Compared with the traditional cylindrical damping liquid buffer device: in the closed chamber of the second cylindrical shell 3 in this embodiment, which has a thin-waisted cylinder structure with a thin middle and thick ends, when the buffer device vibrates axially, the liquid medium 4 moves in the reverse direction with the vibration due to inertia force. Since the radial cross-section of the middle thin waist of the second cylindrical shell 3 is small, obvious turbulent flow phenomena will occur when the liquid medium 4 passes through the position of the middle thin waist of the second cylindrical shell 3, thereby disrupting the natural frequency of the axial vibration and achieving the purpose of suppressing or weakening the vibration energy, and achieving the buffer and vibration reduction effect.

[0030] It should be noted that, according to actual applications, those skilled in the art can also adopt a multi-prismatic structure with a variable diameter and shrinkage in the middle, a square column, etc. for the second cylindrical shell 3, such as a sandglass structure, a dumbbell structure, and so on.

[0031] As Figure 1 , Figure 3 and Figure 4 As shown, the damping member 5 of the embodiment of the present invention includes a third cylindrical shell 51, a damping block 53, a partition plate 52, and a movable rod 54. Among them, taking the damping member 5 installed at the lower end position of the first cylindrical shell 2 as an example, the third cylindrical shell 51 of the damping member 5 is fixed on the inner bottom surface end of the first cylindrical shell 2. The partition plate 52 is horizontally arranged and located inside the third cylindrical shell 51. The movable rod 54 passes through the top surface of the third cylindrical shell 51 and is slidably connected to the third cylindrical shell 51. The lower end of the movable rod 54 vertically passes through the partition plate 52 and is fixed on the partition plate 52. The upper end of the movable rod 54 is fixedly connected to the lower end portion of the second cylindrical shell 3. The damping block 53 is located inside the third cylindrical shell 51. Among them, the number of damping blocks 53 is eight, and the eight damping blocks 53 are arranged in two layers, above and below the partition plate 52, to sandwich the partition plate 52 in the middle.

[0032] As Figure 1 As shown, the buffer device of the embodiment of the present invention further includes two connecting support rods 6. One end of each connecting support rod 6 is fixedly connected to the upper and lower ends of the outside of the second cylindrical shell 3 respectively, and the other end of each connecting support rod 6 is fixedly connected to the movable rods 54 of the two damping members 5. The two connecting support rods 6 are arranged along the axial direction of the second cylindrical shell 3. It should be noted that, according to actual applications, those skilled in the art can set the connecting support rod 6 and the movable rod 54 as an integral structure.

[0033] When the buffer device vibrates axially, the second cylindrical shell 3 drives the partition plate 52 on the movable rod 54 to vibrate up and down inside the third cylindrical shell 51 through the connecting support rod 6, so that the partition plate 52 compresses the damping block 53 to generate deformation to absorb and buffer the vibration energy and acting force.

[0034] It should be noted that the damping block 53 in the embodiment of the present invention is made of metal rubber. Metal rubber is a homogeneous elastic porous material, which is formed by orderly arranging a certain mass of stretched and helical metal wires in a stamping or rolling die through a certain process method and then using the cold stamping method. Metal rubber not only has the inherent characteristics of the selected metal but also has elasticity like rubber. Compared with traditional elastic material devices, metal rubber has greater energy absorption and buffering performance, and also has more reliable safety performance in use. It can adapt to a larger impact load and has a better service life.

[0035] In addition, one end of the movable rod 54 passing through the partition 52 retains a set length to prevent the metal rubber from being axially over-compressed by the partition 52, resulting in the failure of the vibration damping performance of the metal rubber and extending the service life of the metal rubber.

[0036] As Figure 1 shown, the mounting part of the buffer device according to the embodiment of the present invention includes a wire clamp 1, a connecting plate 8 and a connecting seat 7. Among them, the upper end of the wire clamp 1 is fixedly connected to the overhead transmission wire, the connecting plate 8 is fixed to the lower end of the wire clamp 1, and the connecting seat 7 is sleeved and fixed to the upper end of the first cylindrical shell 2. The connecting plate 8 and the connecting seat 7 are fixedly connected by bolts 9.

[0037] It can be understood that the buffer device is vertically hung and fixed on the overhead transmission wire through the wire clamp 1 to suppress and weaken the vertical vibration of the overhead transmission wire. Among them, the first cylindrical shell 2 of the buffer device is of a drum-shaped structure, and the second cylindrical shell 3 and the liquid medium 4 therein, which is simply called the damping liquid energy dissipation structure, and the damping member 5 including metal rubber is simply called the metal rubber energy dissipation structure.

[0038] Specifically, when the overhead transmission wire generates vertical impact vibration, the buffer device vibrates up and down with the overhead transmission wire. On the one hand, the liquid medium 4 of the damping liquid energy dissipation structure moves in the direction opposite to the movement of the damping device due to inertia, and thus a pressure opposite to the movement direction of the buffer device is generated. This pressure acts on the metal rubber energy dissipation structure through the connecting support rod 6 and is transmitted to the mounting part on the first cylindrical shell 2, and then acts on the overhead transmission wire through the wire clamp 1 of the mounting part, thereby playing a role in reducing the vertical impact of the overhead transmission wire.

[0039] In addition, the viscosity of the liquid medium 4 can also play a role in dissipating the vertical impact energy (this kind of damping comes from several aspects such as the boundary layer friction damping between the liquid medium 4 and the container wall, the viscous damping inside the liquid medium 4, and the free surface damping, etc.). By changing the amount of the liquid medium 4, the vertical shock device can be adjusted, and thus its natural frequency can be changed to make its natural frequency consistent with the current aeolian vibration frequency, so as to achieve the optimal damping effect.

[0040] Under the action of large-amplitude impact, when the transmission wire generates impact vibration, on the other hand, the liquid medium 4 of the damping liquid energy dissipation structure sways up and down, which causes the damping liquid energy dissipation structure to vibrate up and down, and makes the partition 52 fixedly connected to the movable rod 54 repeatedly squeeze the metal rubber, and the metal rubber dissipates the impact energy through deformation.

[0041] It can be understood that two energy-consuming structures with different principles are encapsulated inside the buffer device of this embodiment. That is, under the mutual coupling and interaction between the damping liquid energy-consuming structure and the metal rubber energy-consuming structures at both ends, the overall absorption and dissipation of the energy of the vertical impact on the overhead transmission line are strengthened. It has strong energy-consuming ability, high efficiency, and good vibration damping effect. This vibration damping device has good automatic activation performance, can broaden the vibration damping frequency range. The damping liquid energy-consuming structure is used to deal with the current excitation frequency, and the metal rubber energy-consuming structure is used to deal with the possible excitation frequencies from the outside. Compared with the buffer device installed with a single energy-consuming structure, the buffer device of this embodiment forms a double-damping vibration damping system by coupling two energy-consuming structures with different principles to improve the effective vibration damping bandwidth of the vertical buffer device. The buffer device of this embodiment has the characteristics of easy installation, maintenance-free, and good durability performance.

[0042] Embodiment 2

[0043] Based on the buffer device structure of Embodiment 1, two helical springs 10 are added to the buffer device of this embodiment.

[0044] Specifically, as Figure 2 shown, taking the damper 5 at the lower end position of the first cylindrical shell 2 as an example, the helical spring 10 is sleeved on the outside of the connecting support rod 6. The upper end of the helical spring 10 is fixed on the bottom end of the second cylindrical shell 3, and the lower end of the helical spring 10 is fixed on the top surface of the third cylindrical shell 51 of the damper.

[0045] As Figure 4 shown, it can be understood that in the static state after the buffer device completes the shock absorption work, the stress states of the upper and lower two helical springs 10 are adjusted. That is, the helical spring 10 fixed on the bottom end of the second cylindrical shell 3 is in a compressed state, and the helical spring 10 fixed on the top end of the second cylindrical shell 3 is in a stretched state. Thus, the weights of the second cylindrical shell 3 and the liquid medium 4 are balanced and offset, avoiding the long-term extrusion and compaction of the metal rubber below the partition plate 52 in the damper 5 due to the weights of the second cylindrical shell 3 and the liquid medium 4 inside it, which may cause the damping effect to fail. Adjust the helical spring 10 to an appropriate stress state so that the partition plate 52 in the damper 5 does not squeeze the metal rubber, thereby enabling the metal rubber to be in a normal working state, and extending the service life and effect of the buffer device.

[0046] The above are only the embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention pending approval.

Claims

1. A buffer device for overhead transmission conductors, characterized in that, Comprising: A first cylindrical shell (2), one end of which is fixedly connected to the overhead transmission wire; A second cylindrical shell (3) having a sealed chamber therein, and a liquid medium (4) is disposed in the sealed chamber; and A damping member (5); The second cylindrical shell (3) and the damping member (5) are connected in series along the axial direction of the first cylindrical shell (2) and are fixed within the first cylindrical shell (2); The radial dimension of the second cylindrical shell (3) varies along the axial direction of the second cylindrical shell (3), and the radial dimension of the middle region of the second cylindrical shell (3) is smaller than the radial dimension of the end region of the second cylindrical shell (3).

2. The buffer device for an overhead transmission line conductor according to claim 1, wherein, The radial side surface of the second cylindrical shell (3) is radially contracted from the end region of the second cylindrical shell (3) towards the middle region of the second cylindrical shell (3) to form a concave surface.

3. The buffer device for an overhead transmission line conductor according to claim 1, characterized in that, The damping member (5) comprises: A third cylindrical shell (51) which is fixed on the inner end face of the first cylindrical shell (2); A partition plate (52) which is located within the third cylindrical shell (51); Damping blocks (53) which are located within the third cylindrical shell (51); and A movable rod (54) which passes through the third cylindrical shell (51) and is slidably connected to the third cylindrical shell (51), one end of the movable rod (54) is perpendicularly fixed to the partition plate (52), and the other end of the movable rod (54) is fixedly connected to the outer end of the second cylindrical shell (3); The number of the damping blocks (53) is at least two, and the two damping blocks (53) are distributed on both sides of the partition plate (52).

4. The buffer device for an overhead transmission line conductor according to claim 3, characterized in that, The damping blocks (53) comprise metal rubber.

5. The buffer device for an overhead transmission line conductor according to claim 3, characterized in that, The buffer device further comprises a connecting support rod (6), one end of the connecting support rod (6) is fixedly connected to the end of the second cylindrical shell (3), and the other end of the connecting support rod (6) is fixedly connected to the movable rod (54).

6. The buffer device for an overhead transmission line as claimed in claim 5, wherein The buffer device further comprises a helical spring (10), the helical spring (10) is sleeved outside the connecting support rod (6), one end of the helical spring (10) is fixedly connected to the end of the second cylindrical shell (3), and the other end of the helical spring (10) is fixedly connected to the third cylindrical shell (51).

7. The buffer device for an overhead transmission conductor according to claim 1, characterized in that, The radial side surface of the first cylindrical shell (2) is radially expanded from the end region of the first cylindrical shell (2) towards the middle region of the first cylindrical shell (2) to form a convex surface.

8. The buffer device for an overhead transmission line according to claim 7, characterized in that, The first cylindrical shell (2) comprises an elastic metal shell.

9. The buffer device for an overhead transmission line conductor according to claim 1, characterized in that, The buffer device further comprises a mounting portion, one end of the mounting portion is fixed to one end of the first cylindrical shell (2), and the other end of the mounting portion is fixedly connected to the overhead transmission wire.

10. The buffer device for an overhead transmission conductor according to claim 9, characterized in that, The mounting portion comprises: A wire clamp head (1), one end of which is fixedly connected to the overhead transmission wire; A connecting plate (8) which is fixed to the other end of the wire clamp head (1); A connecting seat (7) which is fixed to one end of the first cylindrical shell (2); The connecting plate (8) and the connecting seat (7) are tightly connected by bolts (9).

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