Horizontal buffer device for power transmission conductor

Abstract

The utility model discloses a horizontal buffer device for a power transmission conductor, which comprises a shock absorber, a horizontal buffer device, a horizontal buffer device, a horizontal buffer device, a horizontal buffer device and a horizontal buffer device, and is characterized in that the shock absorber is internally provided with an accommodating cavity which contains damping fluid; and the first end of the clamping assembly is connected with the shock absorber, and the second end of the clamping assembly is clamped on the power transmission conductor. According to the horizontal buffer device for the power transmission conductor, the vibration absorber is clamped on the power transmission conductor, and the inertia of the damping fluid in the vibration absorber and the viscous damping of the damping fluid are utilized to generate an acting force opposite to the motion of the power transmission conductor, so that the mechanical kinetic energy generated by the power transmission conductor due to horizontal impact can be consumed; therefore, the horizontal buffering and vibration reduction effects are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power grid disaster prevention, and specifically relates to a horizontal buffer device for power transmission conductor. BACKGROUND

[0002] Overhead transmission line is an important part of power system, responsible for transmitting electric energy from power plant to transformer substation or user end. As it is exposed to the natural environment, it is easily subjected to horizontal impact under the action of external factors such as lightning, strong wind or breeze, resulting in large amplitude back and forth oscillation in horizontal direction. This oscillation is easy to cause fatigue fracture of the conductor and lead to broken strand accident, and wear and tear between multi-strand lines may also cause electric leakage risk, which seriously threatens the safe operation of power grid. Therefore, it is necessary to take anti-vibration measures to ensure the safe operation of power grid in view of the influence of horizontal impact on overhead transmission conductor. SUMMARY

[0003] The utility model aims at solving the problem of power grid safety accident caused by the influence of horizontal impact on overhead transmission conductor in the prior art.

[0004] The utility model is implemented by the following technical scheme:

[0005] The utility model provides a horizontal buffer device for power transmission conductor, comprising:

[0006] The damper has a cavity in it, and the cavity contains damping liquid;

[0007] The clamping assembly is connected with the damper at the first end and clamped on the power transmission conductor at the second end.

[0008] Preferably, the mass of the damping liquid is obtained by the following calculation formula:

[0009]

[0010] Wherein, ω n is the natural frequency of the damper; k is the stiffness of the damper; m1 is the mass of the damper; m f is the mass of the damping liquid.

[0011] Preferably, the horizontal vibration frequency of the power transmission conductor is defined as ω, wherein: ω n = ω.

[0012] Preferably, the damping ratio of the horizontal buffer device is obtained by the following calculation formula:

[0013]

[0014] Wherein, ξ is the damping ratio of the horizontal buffering device; j is the number of self-vibration attenuation periods of the horizontal buffering device; A1 is the amplitude of the first self-vibration attenuation period; A 1+j A1+j is the amplitude of the first+j self-vibration attenuation period.

[0015] Preferably, the inner surface of the cavity is spherical.

[0016] Preferably, the clamping assembly comprises:

[0017] a chuck, a first end of which is clamped on the power transmission wire;

[0018] a fixing member, a first end of which is fixedly connected with the damper;

[0019] a connecting member, a second end of the fixing member being connected with a second end of the chuck through the connecting member.

[0020] Preferably, the connecting member comprises:

[0021] at least two elbows, a first end of each of the elbows being connected with one of the chucks;

[0022] at least one connecting rod, two ends of the connecting rod being respectively detachably connected with second ends of adjacent ones of the elbows; and a second end of the fixing member being detachably connected on the connecting rod.

[0023] Preferably, the second end of each of the elbows has at least two joints, and the joints of adjacent ones of the elbows are connected through connecting rods to form a ring-shaped frame structure.

[0024] Preferably, each of the joints is provided with an internally threaded hole, and each of the two ends of the connecting rod is provided with an externally threaded hole matched with the internally threaded hole for threaded connection.

[0025] Preferably, the fixing member comprises:

[0026] a fixing rod, a first end of which is fixedly connected with the damper;

[0027] a fastener, the connecting rod being provided with a connecting hole, and a second end of the fixing rod being passed through the connecting hole and fixed by the fastener.

[0028] Compared with the prior art, the horizontal buffering device for power transmission wire has the following beneficial effects:

[0029] (1) The horizontal buffering device for power transmission wire is provided, the damper is clamped on the power transmission wire, the inertia of the damping liquid in the damper and the viscous damping of the damping liquid itself are utilized to generate an action force opposite to the movement of the power transmission wire, the mechanical kinetic energy generated by the power transmission wire due to the horizontal impact can be consumed, and thus the horizontal buffering and damping effects can be achieved.

[0030] (2) The inherent frequency of the horizontal buffering device changes with the change of the damping liquid mass, the horizontal wind vibration impact frequency range is wide, simultaneously, the mass and other parameters of the damping liquid can be adjusted through the change of external vibration excitation, so that the inherent frequency is consistent with the external vibration excitation frequency, and better wide frequency damping effect is obtained.

[0031] (3) The horizontal buffering device encapsulates the damping liquid in the damper, and can avoid the phenomenon of liquid leakage when being hung in the high altitude, and has the advantages of simple structure, long service life and low maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A structural schematic view of the horizontal buffering device for power transmission conductor provided by the utility model is shown in the figure;

[0033] Figure 2 A structural schematic view of the damper provided by the utility model is shown in the figure;

[0034] Figure 3 A structural schematic view of the connecting piece provided by the utility model is shown in the figure;

[0035] Figure 4 A structural schematic view of the connecting piece provided by the utility model is shown in the figure;

[0036] Figure 5 A structural schematic view of the elbow provided by the utility model is shown in the figure;

[0037] Figure 6 A structural schematic view of the connecting rod provided by the utility model is shown in the figure;

[0038] Figure 7 The mechanical model of the horizontal buffering device for power transmission conductor provided by the utility model is shown in the figure;

[0039] Figure 8 The free vibration attenuation curve of the horizontal buffering device for power transmission conductor provided by the utility model is shown in the figure.

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 100, damper; 101, cavity; 102, damping liquid; 103, metal rubber buffering element;

[0042] 200, clamping assembly; 201, chuck; 202, fixing piece; 203, connecting piece;

[0043] 221, fixing rod; 222, fastener;

[0044] 231, elbow; 232, connecting rod;

[0045] 2311, joint; 2321, connecting hole. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", and "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements inside; the terms "first end" and "second end" are two opposite ends. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The horizontal buffer device for power transmission conductor provided by the embodiments of the present application is mainly used for buffering the horizontal impact of overhead transmission conductor under the action of lightning, strong wind or micro wind and other external factors, reducing the damage to the power transmission conductor, and ensuring the safe operation of the power grid.

[0049] Figure 1 is a structural schematic diagram of an embodiment of the horizontal buffer device for power transmission conductor provided by the present application, Figure 2 is a structural schematic diagram of an embodiment of the shock absorber 100 provided by the present application; refer to Figure 1 and Figure 2 The horizontal buffer device comprises: a shock absorber 100, which has a containing cavity 101 inside, and the containing cavity 101 contains damping liquid 102; a clamping assembly 200, which is connected with the shock absorber 100 at the first end and clamped on the power transmission conductor at the second end.

[0050] The shock absorber 100 can be a container capable of containing liquid, having a shell with a certain thickness and a certain weight, and a containing cavity 101 inside the shell, and the containing cavity 101 is used to fill the damping liquid 102.

[0051] The structure of the shell can be spherical, and correspondingly, the containing cavity 101 inside the shell is a spherical accommodating space, that is, the inner surface of the containing cavity 101 is a spherical surface, the internal stress distribution is uniform, has high pressure bearing capacity, long service life and low maintenance cost.

[0052] In order to avoid the phenomenon of liquid leakage, the shell can be designed as a fully sealed one-piece structure; or a liquid inlet can be arranged on the top of the shell, and the liquid inlet is sealed by a top cover, so as to facilitate the taking and placing of the damping liquid 102.

[0053] The damping liquid 102 is a liquid capable of generating viscous resistance, and can be a grease liquid, such as synthetic oil, mineral oil, vegetable oil, animal oil, etc. Such substances have high stability, strong corrosion resistance, and long service life.

[0054] The clamping assembly 200 is used to clamp the damper 100 on the power transmission wire, and can be a chuck 201 having a clamping function and a swing piece or connecting piece 203 connecting the chuck 201 and the damper 100. The damper 100 is connected in a clamped manner, facilitating installation and maintenance.

[0055] The damper 100 mainly generates a force opposite to the movement of the power transmission wire through the mass of the internal damping liquid 102 and the viscous resistance of the damping liquid 102, so as to attenuate the kinetic energy of the moving machine, thereby playing a buffering and damping role.

[0056] The buffering principle is as follows: when the power transmission wire is subjected to horizontal impact under the action of external factors such as wind vibration, the damper 100 moves in the same direction as the power transmission wire, and due to the inertia of the internal damping liquid 102 and the viscous resistance of the damper 100, an opposite force is generated. The force is transmitted to the power transmission wire through the clamping assembly 200, which can consume the kinetic energy of the power transmission wire due to the horizontal impact, thereby playing a buffering and damping role.

[0057] Referring to Figure 2 , in addition to the reaction force generated by the damping liquid 102 to consume the kinetic energy of the power transmission wire, other buffering assemblies, such as a metal rubber buffering element 103, can be provided in the damper 100 and immersed in the damping liquid 102. The metal rubber buffering element 103 has a certain elasticity and will be elastically deformed by the extrusion of the damping liquid 102 during the movement of the damper 100, generating elastic potential energy to further consume the kinetic energy of the power transmission wire, thereby achieving better buffering and damping effect.

[0058] Continuing to refer to Figure 1 , based on the same inventive concept, in some embodiments, specifically, the clamping assembly 200 can include: a chuck 201 clamped at a first end on the power transmission wire; a fixing piece 202 fixedly connected at a first end to the damper 100; and a connecting piece 203 connecting a second end of the fixing piece 202 to a second end of the chuck 201.

[0059] The chuck 201 is used to fix and clamp the damper 100 on the power transmission wire, and can be a lock buckle, a buckle, a spring clamp, etc. The clamped connection facilitates the installation and maintenance of the damper 100.

[0060] The damper 100 is connected with the clamp 201 through the fixing member 202 and the connecting member 203 in sequence.

[0061] Figure 3 is a structural schematic view of the connecting member 203 according to another embodiment of the utility model, Figure 4 is a structural schematic view of the connecting member 203 according to another embodiment of the utility model; Figure 5 is a structural schematic view of the elbow 231 according to an embodiment of the utility model; refer to Figures 3-5 In some embodiments, the connecting member 203 can comprise: at least two elbows 231, the first end of the elbow 231 being connected with one clamp 201; at least one connecting rod 232, the two ends of the connecting rod 232 being respectively detachably connected with the second end of the adjacent elbow 231; and the second end of the fixing member 202 being detachably connected on the connecting rod 232.

[0062] Specifically, refer to Figure 3 The connecting member 203 is formed with the "inverted trapezoidal" structure by connecting the two ends of the connecting rod 232 with one clamp 201 through the elbow 231 respectively, and the damper 100 is connected with the middle part of the connecting rod 232 through the fixing member 202. The "inverted trapezoidal" structure is not easy to produce loosening, has good stability, reduces the energy loss in the transmission process, and meanwhile, the two clamps 201 can be clamped on one power transmission conductor or two adjacent power transmission conductors, so as to realize the buffering and damping purpose of the power transmission conductor in multiple forms and multiple directions.

[0063] Further, in some embodiments, the second end of the elbow 231 is provided with at least two joints 2311, and the joints 2311 of the adjacent elbows 231 are connected through the connecting rod 232 to form a ring frame structure.

[0064] Specifically, refer to Figure 4 and Figure 5The connecting piece 203 has four elbows 231 and four connecting rods 232, wherein the elbow 231 is a three-way elbow 231, the joint 2311 at the first end is connected with the clamp head 201, the two joints 2311 at the second end are connected with the connecting rods 232 respectively, the four elbows 231 are sequentially connected through the four connecting rods 232 to form a square frame structure, and the clamp head 201 is located at the top of the four corners of the square. The square frame structure is more stable than the inverted trapezoidal structure, and the four clamp heads 201 can make the stress of the power transmission conductor more uniform, and are not easy to slip off or break, and meanwhile, the four clamp heads 201 can be clamped on two power transmission conductors and can also be clamped on four power transmission conductors, so that the synchronous buffering and damping purpose of multiple power transmission lines is achieved.

[0065] It should be noted that the clamp head 201 and the first end of the elbow 231 can be fixed by using a pin, a bolt or welding.

[0066] Figure 6 is a structural schematic view of the connecting rod 232 of an embodiment provided by the utility model. In order to facilitate disassembly and assembly, the elbow 231 and the connecting rod 232 can be connected in a threaded mode, and reference is made to Figure 6 In some embodiments, the joint 2311 is provided with an inner threaded hole, and the two ends of the connecting rod 232 are respectively provided with outer threads matched with the inner threaded hole for threaded connection.

[0067] Reference is made to Figure 1 In some embodiments, the fixing piece 202 can include: a fixing rod 221, the first end of which is fixedly connected with the damper 100; and a fastener 222, the connecting rod 232 is provided with a connecting hole 2321, and the second end of the fixing rod 221 passes through the connecting hole 2321 and is fixed by the fastener 222. The fastener 222 is used for fixing the fixing rod 221 on the connecting rod 232, and can be a fastening bolt or a bolt, and the second end of the fixing rod 221 is provided with a threaded hole or a plug hole corresponding to the fastening bolt or the bolt.

[0068] The fixing rod 221 is preferably fixed at the middle part of the connecting rod 232, so that the stress is uniform, and correspondingly, the middle part of the connecting rod 232 can be designed to be thickened to improve the bearing load and avoid the phenomenon of breakage.

[0069] Figure 7 is a mechanical model of the horizontal buffering device for the power transmission conductor of an embodiment of the utility model. Reference is made to Figure 7The mass of the horizontal buffering device is composed of the mass of the damper 100 and the mass of the damping liquid 102; the reaction force of the horizontal impact on the transmission line is composed of the inertial force of the damping liquid 102 with the damper 100 and the viscous force of the damping liquid 102 itself; according to the dynamic balance principle, the motion differential equation of the variable mass damper 100 is shown in the following calculation formula (1):

[0070]

[0071] Wherein, c is the viscous damping of the damping liquid 102 itself; k is the stiffness of the horizontal buffering device; m1 is the mass of the damper 100; m f is the mass of the damping liquid 102; F is the reaction force of the horizontal impact on the transmission line; x represents the horizontal displacement variation of the damper 100; represents the velocity variation of the damper 100; represents the acceleration variation of the damper 100.

[0072] It can be understood that the total mass of the horizontal buffering device generally cannot exceed the maximum load that can be borne by the transmission line suspended thereby, so the mass of the damping liquid that can be borne in the damper 100 needs to be limited in a certain range, i.e. can be varied in the range of 0 to m fmax , wherein m fmax is the maximum mass of the damping liquid, which is affected by the maximum load bearing of the transmission line suspended thereby. In the motion process of the damper 100, when the mass m f of the damping liquid 102 is adjusted in the range of 0 to m fmax according to the external excitation, the mass m of the horizontal buffering device can be varied in the range of m1 to m1+m fmax .

[0073] The natural frequency of the damper 100 can be obtained by the following calculation formula (2):

[0074]

[0075] As can be seen from the above calculation formula (2), when the mass m f of the damping liquid 102 is varied in the range of 0 to m fmax , the natural frequency ω n of the damper 100 also changes, and the variation range is to

[0076] Therefore, the horizontal vibration frequency ω of the transmission line generated by the external excitation is located in to When the natural frequency ω of the damper 100 is consistent with the horizontal vibration frequency ω of the power transmission conductor, the energy consumption of the horizontal buffer device is maximized, for example, when the horizontal vibration frequency ω of the power transmission conductor is generated by the horizontal wind vibration, the natural frequency ω of the damper 100 can be adjusted to be consistent with the current horizontal wind vibration frequency, so that the optimal buffering and damping effect can be achieved. n When the natural frequency ω of the damper 100 is consistent with the horizontal vibration frequency ω of the power transmission conductor, the energy consumption of the horizontal buffer device is maximized, for example, when the horizontal vibration frequency ω of the power transmission conductor is generated by the horizontal wind vibration, the natural frequency ω of the damper 100 can be adjusted to be consistent with the current horizontal wind vibration frequency, so that the optimal buffering and damping effect can be achieved.

[0077] Figure 8 is a free vibration decay curve diagram of the horizontal buffer device of the power transmission conductor, wherein the abscissa t represents the decay time, the ordinate A(t) represents the amplitude size changing with time, j is the number of self-vibration decay periods of the horizontal buffer device, t j is the decay time of the jth period, T D is the decay time of one period, A1 is the amplitude of the first period of self-vibration decay, A 1+j is the amplitude of the first+j period of self-vibration decay.

[0078] The damping ratio is the ratio of the actual damping of the damping vibration to the resistance required to generate the critical damping, which represents the decay form of the structure after being excited to vibrate, and is an important parameter for measuring the energy dissipation capacity of the structure in the vibration process. The damping ratio can reflect the ability of the structure to convert vibration energy into heat energy or other forms of energy. A higher damping ratio means that more energy is dissipated, which can effectively reduce the dynamic response of the structure under dynamic load, thereby reducing the vibration of the structure. Therefore, by reasonably selecting the damping ratio, the dynamic response of the horizontal buffer device under wind vibration can be effectively reduced, thereby playing a damping role.

[0079] The damping ratio of the horizontal buffer device of the utility model embodiment can be obtained by free vibration, by means of external load to exert impact excitation on the horizontal buffer device to generate a certain initial displacement, and then unloading the external load to make it produce free decay vibration. Through data analysis software, an ideal vibration decay curve (as shown in Figure 8 ) is obtained, and the logarithmic decay rate is obtained according to the amplitude decay formula, and then the damping ratio of the horizontal buffer device is obtained according to the logarithmic decay rate. The amplitude decay formula is shown in the following calculation formula (3):

[0080]

[0081] Wherein, δ is the logarithmic decay rate, j is the number of self-vibration decay periods of the horizontal buffer device, e is the base number of the natural logarithm function, A1 is the amplitude of the first period of self-vibration decay, and A 1+j is the amplitude of the first+j period of self-vibration decay.

[0082] Thus, a calculation formula of the logarithmic decrement can be obtained by the above calculation formula (3), as shown in the following calculation formula (4):

[0083]

[0084] According to a relationship between the logarithmic decrement and the damping ratio: logarithmic decrement = damping ratio / 2π, a calculation formula of the damping ratio of the horizontal buffering device can be obtained by the above calculation formula (4), as shown in the following calculation formula (5):

[0085]

[0086] wherein ξ is the damping ratio of the horizontal buffering device; j is the number of self-vibration attenuation periods of the horizontal buffering device; A1 is the amplitude of the first self-vibration attenuation period; A 1+j is the amplitude of the 1+jth self-vibration attenuation period.

[0087] The above is only an embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the scope of the present application.

Claims

1. A horizontal buffer device for a power transmission conductor, characterized by The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100).

2. The horizontal buffer for power transmission conductors according to claim 1, characterized in that, The damping liquid is contained in a cavity (101) in the damper (100). where ω n is the natural frequency of the damper (100); k is the stiffness of the damper (100); m1 is the mass of the damper (100); m f is the mass of the damping liquid.

3. The horizontal buffer for power transmission conductors according to claim 2, characterized in that, The power transmission conductor horizontal vibration frequency is defined as ω, where: n = ω.

4. The horizontal spacer for power transmission conductors according to claim 1, characterized by, The inner surface of the cavity (101) is spherical. wherein ξ is the damping ratio of the horizontal buffering device; j is the number of self-vibration decay periods of the horizontal buffering device; A1is the amplitude of the first self-vibration decay period; A 1+j is the amplitude of the first+j self-vibration decay period.

5. The horizontal spacer for power transmission conductors according to claim 1, characterized by, The damping liquid is contained in a cavity (101) in the damper (100).

6. The horizontal buffer for power transmission conductors according to any one of claims 1 to 5, characterized in that, The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100).

7. The horizontal buffer for power transmission conductors according to claim 6, characterized in that, The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100).

8. The horizontal buffer for power transmission conductors according to claim 7, characterized in that, The damping liquid is contained in a cavity (101) in the damper (100).

9. The horizontal buffer for power transmission conductors according to claim 8, characterized in that, The damping liquid is contained in a cavity (101) in the damper (100).

10. The horizontal spacer for power transmission conductors according to claim 7, characterized by, The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in the damper (100). The damping liquid is contained in a cavity (101) in

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