Buffer device for overhead transmission conductor

Abstract

The invention provides a buffer device for an overhead transmission conductor. The buffer device comprises a first cylindrical shell, a second cylindrical shell and a damping piece. 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 invention relates to the technical field of power grid disaster prevention, and specifically provides a buffer device for overhead power transmission lines. Background Art

[0002] When overhead transmission lines are subjected to large-amplitude vertical impacts, they are affected by the combined effects of amplitude and frequency. Such large-amplitude vertical impacts can easily lead to the risk of breakage of the overhead transmission lines, thereby deteriorating the transmission and mechanical properties of the overhead transmission lines and reducing the service life of the overhead transmission lines.

[0003] How to effectively suppress large-amplitude vertical impact vibration of overhead transmission lines has become an urgent problem to be solved. Summary of the invention

[0004] The object of the present invention is to provide a buffer device for an overhead power transmission line to overcome the problem of the difficulty in suppressing the overhead power transmission line from being subjected to a large amplitude vertical impact.

[0005] The purpose of the present invention is to adopt the following technical solutions to achieve:

[0006] The present invention provides a buffer device for an overhead power transmission line, the buffer device comprising: a first cylindrical shell, one end of which is fixedly connected to the overhead power transmission line; a second cylindrical shell, which has a closed chamber, wherein a liquid medium is placed; and a damping element; the second cylindrical shell and the damping element are connected in series along the axial direction of the first cylindrical shell and 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 radially contracts from the end region of the second cylindrical shell toward the middle region 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, which is located inside the third cylindrical shell; a damping block, which is located inside the third cylindrical shell; and a movable rod, which passes through the third cylindrical shell and is slidably connected to the third cylindrical shell, one end of the movable rod is vertically fixed to the partition, and the other end of the movable rod is fixedly connected to 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.

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

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

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

[0012] Preferably, the radial side surface of the first cylindrical shell radially expands from the end area of ​​the first cylindrical shell to the middle area of ​​the first cylindrical shell to form a convex surface.

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

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

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

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The buffer device for overhead power transmission lines provided by the present invention comprises 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 power transmission line, the second cylindrical shell has a closed chamber, the closed chamber contains a liquid medium, the second cylindrical shell and the damping member are connected in series along the axial direction of the first cylindrical shell and 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. Through such a setting, the second cylindrical shell has a thin 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 area of ​​the closed chamber several times, so that the liquid medium forms turbulence during the flow process, avoiding a large amount of 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 second cylindrical shell of the buffer device with the liquid medium is combined with the damping member into a double energy-consuming structure, which greatly improves the vibration reduction and buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of Embodiment 1 of the buffer device of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a second embodiment of the buffer device of the present invention;

[0020] Figure 3 The structure of the damping member of the buffer device of the present invention is schematically shown in FIG. Figure 1 ;

[0021] Figure 4 The structure of the damping member of the buffer device of the present invention is schematically shown in FIG. Figure 2 .

[0022] Figure numerals: 1-wire clamp; 2-first cylindrical shell; 3-second cylindrical shell; 4-liquid medium; 5-damping member; 51-third cylindrical shell; 52-partition; 53-damping block; 54-movable rod; 6-connecting support rod; 7-connecting seat; 8-connecting plate; 9-bolt; 10-helical spring. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

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

[0025] Example 1

[0026] like Figure 1As shown, the buffer device for overhead power transmission lines of the embodiment of the present invention comprises a mounting portion, a first cylindrical shell 2, a second cylindrical shell 3 and two damping members 5. Among them, the lower end of the mounting portion is fixed to the upper end of the first cylindrical shell 2, and the upper end of the mounting portion is fixedly connected to the overhead power transmission line. The second cylindrical shell 3 has a closed chamber, and the closed chamber is filled with a liquid medium 4. The two damping members 5 are respectively fixed at 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 fixed in the first cylindrical shell 2. The radial dimension of the second cylindrical shell 3 changes along the axial direction of the second cylindrical shell 3, and the radial dimension of the middle area of ​​the second cylindrical shell 3 is smaller than the radial dimension of the end area of ​​the second cylindrical shell 3.

[0027] Specifically, Figure 1 As shown, the first cylindrical shell 2 of the buffer device of the embodiment of the present invention adopts an elastic metal shell, and the radial side 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 of the first cylindrical shell 2 protrudes outward, and the first cylindrical shell 2 forms a drum-like structure with a protruding middle part. When the first cylindrical shell 2 is subjected to axial vibration impact, the first cylindrical shell 2 absorbs part of the vibration impact energy through partial elastic deformation and then reduces the vibration energy, thereby improving the load-bearing capacity and safety reliability of the buffer device. Among them, the two damping members 5 are respectively fixed on the top surface end and the bottom surface end of the inner side of the first cylindrical shell 2.

[0028] like Figure 1 As shown, the radial side surface of the second cylindrical shell 3 of the buffer device of the embodiment of the present invention is radially contracted 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 concave inward so that the second cylindrical shell 3 forms a thin waist cylindrical structure.

[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: the closed chamber of the second cylindrical shell 3 in this embodiment is a thin-waisted cylindrical structure with a thin middle and thick ends. When the buffer device vibrates axially, the liquid medium 4 moves in the opposite direction with the vibration due to inertia. Since the radial cross-section of the thin waist in the middle of the second cylindrical shell 3 is small, the liquid medium 4 will produce obvious turbulence when passing through the thin waist in the middle of the second cylindrical shell 3, thereby disrupting the natural frequency of the axial vibration to achieve the purpose of suppressing or weakening the vibration energy, thereby achieving the effect of buffering and vibration reduction.

[0030] It should be noted that, according to practical applications, those skilled in the art may also adopt a polygonal column structure or a square column structure with a reduced diameter in the middle, such as an hourglass structure, a dumbbell structure, etc. for the second cylindrical shell 3 .

[0031] like 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 52 and a movable rod 54. Among them, taking the damping member 5 installed at the lower end 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 52 is horizontally arranged and located in 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 52 and is fixed on the partition 52, the upper end of the movable rod 54 is fixedly connected to the lower end of the second cylindrical shell 3, and the damping block 53 is located in 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 on the upper and lower sides of the partition 52 to sandwich the partition 52 in the middle.

[0032] like 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 respectively fixedly connected to the upper and lower ends of the outer side of the second cylindrical shell 3, and the other end of each connecting support rod 6 is respectively fixedly connected to the movable rods 54 of the two damping members 5, and 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 integrated structure.

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

[0034] It should be noted that the damping block 53 in the embodiment of the present invention is made of metal rubber, which is a homogeneous elastic porous material. Metal wires of a certain mass, stretched and spiraled are orderly placed in a stamping or rolling die through a certain process method, and then formed by a cold stamping method. The metal rubber has both the inherent properties of the selected metal and the elasticity of rubber. Compared with traditional elastic material devices, the metal rubber has greater energy absorption and buffering performance, more reliable and safe performance, can adapt to greater impact loads, 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 excessively compressed axially by the partition 52, which may cause the vibration reduction performance of the metal rubber to fail, thereby extending the service life of the metal rubber.

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

[0037] It can be understood that the buffer device is vertically suspended and fixed on the overhead power transmission line through the conductor clamp 1 to suppress and weaken the vertical vibration of the overhead power transmission line. Among them, the first cylindrical shell 2 of the buffer device is a drum-shaped structure, the second cylindrical shell 3 and its built-in liquid medium 4 are referred to as the damping liquid energy dissipation structure, and the damping member 5 containing metal rubber is referred to as the metal rubber energy dissipation structure.

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

[0039] In addition, the viscosity of the liquid medium 4 can also dissipate the vertical impact energy (this damping comes from the boundary layer friction damping between the liquid medium 4 and the solid wall of the container, the viscous damping inside the liquid medium 4, and the free surface damping). By changing the amount of liquid medium 4 to vertically buffer the impact device, its natural frequency is changed so that its natural frequency is consistent with the current breeze vibration frequency, thereby achieving the optimal damping effect.

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

[0041] It can be understood that the buffer device of this embodiment internally encapsulates two energy-absorbing structures of different principles, that is, the damping liquid energy-absorbing structure and the metal rubber energy-absorbing structures at both ends are coupled and interact with each other, which overall strengthens the absorption and dissipation of the energy of the vertical impact of the overhead power transmission line, has strong energy-absorbing capacity, high efficiency, and good vibration reduction effect. The vibration reduction device has good automatic activation performance and can widen the vibration reduction frequency range. The damping liquid energy-absorbing structure is used to cope with the current excitation frequency, and the metal rubber energy-absorbing structure copes with the excitation frequency that may be generated by the outside world. Compared with the buffer device installed with a single energy-absorbing structure, the buffer device of this embodiment forms a dual damping vibration reduction system by coupling two energy-absorbing structures of different principles to increase the effective vibration reduction frequency band width of the vertical buffer device. The buffer device of this embodiment has the characteristics of easy installation, maintenance-free, and good durability.

[0042] Example 2

[0043] Based on the structure of the buffer device in embodiment 1, the buffer device of this embodiment adds two coil springs 10.

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

[0045] like Figure 4 As shown, it can be understood that, in the static state after the shock absorbing work of the buffer device is completed, the stress state of the upper and lower coil springs 10 is adjusted, that is, the coil spring 10 fixed on the bottom end of the second cylindrical shell 3 is in a compressed state, and the coil spring 10 fixed on the top end of the second cylindrical shell 3 is in a stretched state, thereby balancing and offsetting the weight of the second cylindrical shell 3 and the liquid medium 4, avoiding the weight of the second cylindrical shell 3 and the liquid medium 4 inside the damping member 5. The metal rubber below the partition 52 is squeezed and compacted for a long time, resulting in the failure of the damping effect. The coil spring 10 is adjusted to a suitable stress so that the partition 52 in the damping member 5 does not squeeze the metal rubber, thereby making the metal rubber in a normal working state, thereby extending the service life and effect of the buffer device.

[0046] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A buffer device for an overhead power transmission line, characterized in that: include: A first cylindrical shell (2), one end of which is fixedly connected to the overhead power transmission line; A second cylindrical shell (3) having a sealed chamber, wherein a liquid medium (4) is contained in the sealed chamber; and 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 in the first cylindrical shell (2); The radial dimension of the second cylindrical shell (3) changes along the axial direction of the second cylindrical shell (3), and the radial dimension of the middle area of ​​the second cylindrical shell (3) is smaller than the radial dimension of the end area of ​​the second cylindrical shell (3).

2. The buffer device for overhead power transmission line according to claim 1, characterized in that: The radial side surface of the second cylindrical shell (3) radially contracts from the end area of ​​the second cylindrical shell (3) to the middle area of ​​the second cylindrical shell (3) to form a concave surface.

3. The buffer device for overhead power transmission line according to claim 1, characterized in that: The damping member (5) comprises: A third cylindrical shell (51) fixed on the inner end surface of the first cylindrical shell (2); a partition (52) located inside the third cylindrical shell (51); a damping block (53) located in the third cylindrical shell (51); and a movable rod (54) passing through the third cylindrical shell (51) and slidably connected to the third cylindrical shell (51), one end of the movable rod (54) being vertically fixed on the partition (52), and the other end of the movable rod (54) being 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 overhead power transmission line according to claim 3, characterized in that: The damping block (53) comprises metal rubber.

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

6. The buffer device for overhead power transmission line according to claim 5, characterized in that: The buffer device also includes a coil spring (10), which is sleeved on the outside of the connecting support rod (6), one end of the coil spring (10) is fixedly connected to the end of the second cylindrical shell (3), and the other end of the coil spring (10) is fixedly connected to the third cylindrical shell (51).

7. The buffer device for overhead power transmission line according to claim 1, characterized in that: 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.

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

9. The buffer device for overhead power transmission line according to claim 1, characterized in that: The buffer device also includes a mounting portion, one end of which is fixed to one end of the first cylindrical shell (2), and the other end of which is fixedly connected to the overhead power transmission line.

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

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