Variable cross-section arched nonlinear damping device for multi-split conductors

Abstract

This invention discloses a variable cross-section arched nonlinear vibration damping device for multi-split conductors, comprising a clamp-type rotary spacer, a variable cross-section arch, a hollow cylindrical pin, and a rigid mass ring. Multiple arc-shaped notches are evenly distributed circumferentially on the inner side of the clamp-type rotary spacer. A variable cross-section arch is rigidly connected to the inner side of each arc-shaped notch, and the outward direction of the arch apex of the variable cross-section arch is opposite to the inward direction of the arc-shaped notch. The rigid mass ring located inside the variable cross-section arch is rigidly connected to the center of the arch apex. This invention obtains different stiffness ranges by changing the structural parameters of the variable cross-section arch, exhibiting strong adaptability, simple structure, and easy installation. All connections are rigid, forming a complete energy dissipation chain: conductor → arch structure → hollow cylindrical pin → rigid mass ring. This broadens the effective vibration damping frequency band and improves vibration energy dissipation efficiency compared to previous methods.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction device technology, and in particular to a variable cross-section arched nonlinear vibration reduction device for multi-split conductors. Background Technology

[0002] Conductor galloping on power transmission lines mainly occurs under severe weather conditions such as low temperatures, icing, rain, and snow, posing significant challenges to on-site inspection and maintenance. This type of galloping can easily trigger line tripping, leading to widespread and prolonged power outages, seriously threatening the safe and stable operation of the power grid, and potentially causing substantial socio-economic losses and negative impacts. Therefore, deploying effective vibration damping devices is crucial.

[0003] Compared to single conductors, split conductors have higher transmission efficiency. However, with the increase in transmission voltage level and transmission capacity, the number and cross-sectional size of the sub-conductors of split conductors also increase accordingly. In addition, the high ground clearance and large span of the lines lead to a decrease in the overall stiffness and torsional characteristics of split conductors, which significantly increases the risk of galloping and sub-span oscillation.

[0004] Therefore, in order to effectively suppress the vibration (especially galloping) of multi-split conductors, it is urgent to design vibration reduction devices that combine wide bandwidth characteristics and simple structure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and defects of the prior art and provide a variable cross-section arched nonlinear vibration reduction device for multi-split conductors, which introduces the nonlinear characteristics of the variable cross-section arch into the wire clamp rotary spacer, thereby achieving efficient vibration reduction under vibration conditions.

[0006] This invention is achieved through the following technical solution: A variable cross-section arched nonlinear vibration damping device for multi-split conductors includes a clamp-type rotary spacer, a variable cross-section arch, a hollow cylindrical pin, and a rigid mass ring. Multiple arc-shaped notches are evenly distributed circumferentially on the inner side of the clamp-type rotary spacer. A variable cross-section arch is rigidly connected to the inner side of each arc-shaped notch, and the outward direction of the arch apex of the variable cross-section arch is opposite to the inward direction of the arc-shaped notch. The rigid mass ring located inside the variable cross-section arch is rigidly connected to the center of the arch apex of the variable cross-section arch.

[0007] Preferably, the variable cross-section arch is rigidly connected to both sides of the arc-shaped notch at the arch foot by two fixing bolts.

[0008] Preferably, the rigid mass ring and the arch center of the variable cross-section arch are rigidly connected by a hollow cylindrical pin and a connecting bolt. Preferably, the hollow cylindrical pin is coaxially sleeved on the arch top connecting bolt, and the hollow cylindrical pin is radially assembled in a preset fit gap between the variable cross-section arch and the rigid mass ring. The connecting bolt is used to fasten the variable cross-section arch and the rigid mass ring through a bolt-nut pair fit.

[0009] Preferably, the end face of the hollow cylindrical pin contacts the arch top plane of the variable cross-section arch and the inner bearing surface of the rigid mass ring, respectively, forming a radial concentrated load transmission path.

[0010] Preferably, the volume of the enclosing space of the inner side of the wire clamp rotary spacer with evenly distributed arc-shaped notches in the circumference is greater than the maximum thermal expansion volume of the variable cross-section arch, ensuring that a non-contact state is maintained under extreme low temperature shrinkage or vibration deformation conditions.

[0011] Preferably, the variable cross-section arch adopts a variable thickness topology with thickened arch feet and gradually thinned arch top, which improves buckling stability through the gradient distribution of the cross-sectional moment of inertia.

[0012] Preferably, the inner circumferential surface of the wire clamp rotary spacer is a regular polygon, and the arc-shaped notch is formed on the inner surface of the regular polygon.

[0013] Preferably, the rigid mass ring has a regular polygonal structure that is adapted to and matches the shape of the inner circumferential surface of the wire clamp rotary spacer.

[0014] Preferably, the outer circumference of the rotating spacer bar is uniformly and detachably connected to multiple clamps for multi-split conductors.

[0015] Preferably, the wire clamp and the body of the rotating spacer are connected by bolts.

[0016] This invention employs a variable cross-section arch, thick at both ends and thin in the middle, to provide nonlinear stiffness. Different stiffness ranges can be obtained by changing the structural parameters of the variable cross-section arch, exhibiting strong adaptability, simple structure, and ease of installation. All connections in this invention utilize rigid connections, forming a complete energy dissipation chain of "conductor → arch structure → hollow cylindrical pin → rigid mass ring". Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the variable cross-section arched nonlinear vibration reduction device for multi-split conductors according to the present invention.

[0018] Figure 2 This is a schematic diagram of the rotating spacer bar in the variable cross-section arched nonlinear vibration damping device for multi-split conductors according to the present invention.

[0019] Figure 3This is a schematic diagram of the variable cross-section arch in the variable cross-section arched nonlinear vibration reduction device for multi-split conductors of the present invention.

[0020] Figure 4 This is a comparison diagram of the thickness coefficient of the variable cross-section arched nonlinear vibration damping device for multi-split conductors of the present invention with the load-displacement curves of the variable cross-section arch.

[0021] Figure 5 This is a schematic diagram of the rigid mass ring in the variable cross-section arched nonlinear vibration damping device for multi-split conductors according to the present invention.

[0022] Numbering on the map: 1-Rotating clamp spacer, 2-Variable cross-section arch, 3-Hollow cylindrical pin, 4-Rigid mass ring. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0024] The present invention relates to a variable cross-section arched nonlinear vibration damping device for multi-split conductors, which introduces a variable cross-section arch structure into a wire clamp rotary spacer structure. Its nonlinear characteristics enable the device to effectively suppress conductor vibration over a wide frequency range. The device has a simple structure and high reliability.

[0025] like Figure 1 As shown, the variable cross-section arched nonlinear vibration damping device for multi-split conductors of the present invention includes a clamp-type rotary spacer 1, a variable cross-section arch 2, and a rigid mass ring 4. The clamp-type rotary spacer 1 has uniformly distributed arc-shaped notches on its inner circumference. A variable cross-section arch 2 is rigidly connected to the inner side of each arc-shaped notch, and the outward direction of the arch apex of the variable cross-section arch 2 is opposite to the inward direction of the arc-shaped notch. The rigid mass ring 4, located inside the variable cross-section arch 2, is rigidly connected to the center of the arch apex of the variable cross-section arch. like Figure 2 As shown in the embodiment of this application, the outer side of the wire clamp rotary spacer is connected to the multi-split conductor, and the arc-shaped notches evenly distributed on its inner circumference are connected to the arch foot of the variable cross-section arch by fixing bolts. Specifically, the variable cross-section arch 2 is rigidly connected to the inner circumferential surface of the wire clamp rotary spacer 1 on both sides of the arc-shaped notch at the arch foot by two fixing bolts.

[0026] In a preferred embodiment, the volume of the enclosing space of the arc-shaped notch needs to be greater than the maximum thermal expansion volume of the variable cross-section arch to ensure that a non-contact state is maintained under extreme low-temperature shrinkage or vibration deformation conditions.

[0027] In one embodiment, the rigid mass ring 4 is fastened to the center of the arch top of the variable cross-section arch 2 by a bolt-nut pair, and the hollow cylindrical pin 3 is radially assembled in a preset fitting gap between the variable cross-section arch 2 and the rigid mass ring 4.

[0028] like Figure 3 As shown, in a preferred embodiment, the cross-section arch gradually thins from both ends towards the middle. When subjected to a radial concentrated load at the arch crown, its load-displacement curve exhibits a significant nonlinear characteristic. Load-displacement curves for different thicknesses are shown below. Figure 4 As shown.

[0029] like Figure 5 As shown, in a preferred embodiment, the thickness of the rigid mass ring is greater than the thickness of the variable cross-section arch, and it has openings around its perimeter for fastening to the arch top of the variable cross-section arch via bolt-nut pairs.

[0030] In a preferred embodiment, the inner circumferential surface of the wire clamp rotary spacer is a regular polygon, such as a regular octagon, and the arc-shaped notch is formed on the inner surface of the regular polygon. In another preferred embodiment, the rigid mass ring is a regular polygon structure, such as a regular octagon, which is adapted to fit the shape of the inner circumferential surface of the wire clamp rotary spacer.

[0031] In a preferred embodiment, multiple clamps for multi-split conductors, such as eight, are uniformly and detachably connected to the outer circumference of the clamp-rotating spacer. In another preferred embodiment, the clamps are bolted to the body of the clamp-rotating spacer. Specifically, a U-shaped groove for mounting the clamps is integrally formed on the outer circumferential surface of the clamp-rotating spacer body. One end of the clamp is installed in the groove and fixed by a through bolt. Figure 2 As shown.

[0032] The working process of the variable cross-section arched nonlinear vibration reduction device for multi-split conductors according to an embodiment of the present invention is as follows: When a multi-split conductor experiences significant vibration under wind-induced conditions, this vibration is transmitted via the rotating spacer bar 1 and the fixing bolts to the variable cross-section arch 2. From there, it is radially transmitted to the rigid mass ring 4 through the hollow cylindrical pin 3, causing the rigid mass ring 4 to vibrate. The vibration of the rigid mass ring 4 then transmits a radial concentrated load to the top of the variable cross-section arch 2 via the hollow cylindrical pin 3, causing the arch 2 to deform. This generates a force in the opposite direction to the significant vibration of the conductor, thus suppressing the vibration of the multi-split conductor.

[0033] As can be seen from the above description, this invention introduces nonlinear factors into the wire clamp rotary spacer, which broadens the effective vibration reduction frequency band and improves the vibration energy dissipation efficiency on the original basis.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within the invention.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A variable cross-section arched nonlinear damping device for multi-split conductors, characterized in that, The device includes a wire clamp rotary spacer, a variable cross-section arch, a hollow cylindrical pin, and a rigid mass ring. Multiple arc-shaped notches are evenly distributed circumferentially on the inner side of the wire clamp rotary spacer. A variable cross-section arch is rigidly connected to the inner side of each arc-shaped notch, and the outward direction of the arch's apex is opposite to the inward direction of the arc-shaped notch. The rigid mass ring, located inside the variable cross-section arch, is rigidly connected to the center of the arch's apex.

2. The variable cross-section arched nonlinear damping device for multi-bundled conductors according to claim 1, characterized in that, The variable cross-section arch is rigidly connected to both sides of the arc-shaped notch at the arch foot by two fixing bolts.

3. The variable cross-section arched nonlinear damping device for multi-bundled conductors according to claim 1, characterized in that, The rigid mass ring and the arch center of the variable cross-section arch are rigidly connected by a hollow cylindrical pin and a connecting bolt. Preferably, the hollow cylindrical pin is coaxially sleeved on the arch top connecting bolt, and the hollow cylindrical pin is radially assembled in a preset fit gap between the variable cross-section arch and the rigid mass ring. The connecting bolt is used to fasten the variable cross-section arch and the rigid mass ring through a bolt-nut pair fit.

4. The variable cross-section arched nonlinear damping device for multi-bundled conductors according to claim 3, characterized in that, The end face of the hollow cylindrical pin contacts the top plane of the variable cross-section arch and the inner bearing surface of the rigid mass ring, respectively, forming a radial concentrated load transmission path.

5. The variable cross-section arched nonlinear damping device for multi-bundled conductors according to claim 1, characterized in that, The inner side of the rotating spacer bar has a circumferentially distributed arc-shaped notch containing a volume larger than the maximum thermal expansion volume of the variable cross-section arch, ensuring that it remains in a non-contact state under extreme low-temperature shrinkage or vibration deformation conditions.

6. The variable cross-section arched nonlinear vibration damping device for multi-split conductors according to claim 1, characterized in that, The variable cross-section arch adopts a variable thickness topology with thickened arch feet and gradually thinned arch top, which improves buckling stability through the gradient distribution of the cross-sectional moment of inertia.

7. The variable cross-section arched nonlinear vibration damping device for multi-split conductors according to claim 1, characterized in that, The inner circumferential surface of the wire clamp rotary spacer is a regular polygon, and the arc-shaped notch is formed on the inner surface of the regular polygon.

8. The variable cross-section arched nonlinear vibration damping device for multi-split conductors according to claim 1, characterized in that, The rigid mass ring has a regular polygonal structure, which is adapted to fit the shape of the inner circumference of the wire clamp rotary spacer.

9. The variable cross-section arched nonlinear vibration damping device for multi-split conductors according to claim 1, characterized in that, The outer circumference of the rotating spacer bar is uniformly and detachably connected to multiple clamps for multi-split conductors.

10. The variable cross-section arched nonlinear vibration damping device for multi-split conductors according to claim 9, characterized in that, The main body of the wire clamp and the rotating spacer bar are connected by bolts.

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