Umbrella-shaped transmission conductor damping device

Abstract

The invention discloses an umbrella-shaped transmission conductor damping device which comprises a wire clamp, a flat plate parallel to the wiring direction of the wire clamp is fixed to the bottom of the wire clamp, a damping umbrella is fixed to the bottom of the flat plate and comprises an umbrella shaft, N long umbrella ribs, N short umbrella ribs and an umbrella cover, the top end of the umbrella shaft is fixed to the flat plate, and the top end of the umbrella shaft is fixed to the flat plate. The umbrella shaft is sequentially sleeved with a spring and an umbrella top weight disc from top to bottom, one end of the spring is fixed to the flat plate, and the other end of the spring is fixed to the umbrella top weight disc. An umbrella shaft base plate is fixed at the bottom of the umbrella shaft, and the umbrella top weight plate is connected with the umbrella bottom tray through N long umbrella ribs and N short umbrella ribs; the umbrella cover covers the N long umbrella ribs; the design of the elastic force of the spring and the weight of the umbrella top weight disc is that the anti-vibration umbrella is in a folded state in a static state. According to the vibration reduction device, the vibration of the wire is reduced by increasing the air resistance when the wire vibrates.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission line devices, and particularly relates to a vibration damping device for transmission wires under the action of wind loads. Background Art

[0002] With the development of the economy and the improvement of national demands, the demand for electricity consumption in China still shows an upward trend in growth rate. The scale of the power grid is constantly expanding, and the number of high-voltage, extra-high-voltage and ultra-high-voltage transmission lines is increasing continuously. To reduce the cost of power transmission, the span of newly built lines is getting larger and larger, the transmission towers are becoming taller and taller, and the diameter of the transmission wires is increasing, which makes the transmission wires bear stronger wind loads. The accidents of wire strand breakage and wire breakage caused by wind vibration occur frequently, resulting in huge economic losses.

[0003] To reduce the impact of wire vibration and breakage accidents caused by wind loads, vibration damping hammers are mostly used as line vibration damping structures in existing projects. The common type of vibration damping hammer is the Stockbridge vibration damping hammer, whose main body consists of metal hammers at both ends, a flexible steel strand in the middle and a wire clamp, and is fixed at the antinode of the wire vibration through a fixture. When the wind blows the wire and causes high-frequency and small-amplitude vibration, the hammers of the vibration damping hammer swing in the opposite direction due to inertia, and the steel strand dissipates the vibration energy into heat through material friction and internal damping. At the same time, its natural frequency matches the main vibration frequency of the wire, forming a "frequency absorption" effect and destroying the resonance condition.

[0004] With the increase of the line span and the wire diameter, the weight of the vibration damping hammer will also increase correspondingly, which increases the wear of the wire clamp at the suspension point of the vibration damping hammer on the wire. Coupled with the high-frequency vibration caused by wind loads, the wire suspension point will be subject to more serious fatigue damage. Therefore, it is necessary to design a lightweight vibration damping device. Summary of the Invention

[0005] Aiming at the problem of vibration of transmission wires under the action of wind loads in the above-mentioned existing technology, the present invention provides an umbrella-shaped vibration damping device for transmission wires.

[0006] To solve the above technical problems, a vibration damping device for umbrella-shaped transmission lines according to the present invention includes a wire clamp. A flat plate parallel to the wire routing direction of the wire clamp is fixed to the bottom of the wire clamp. A vibration damping umbrella is fixed to the bottom of the flat plate. The vibration damping umbrella includes an umbrella shaft, N long umbrella ribs, N short umbrella ribs, and an umbrella surface. The top end of the umbrella shaft is fixed to the flat plate. A spring and an umbrella top weight plate are sleeved on the umbrella shaft from top to bottom in sequence. One end of the spring is fixed to the flat plate, and the other end of the spring is fixed to the umbrella top weight plate. An umbrella shaft chassis is fixed to the bottom of the umbrella shaft. One end of each long umbrella rib is hinged to the umbrella top weight plate. One end of each of the N short umbrella ribs is hinged to the middle of one of the N long umbrella ribs in a one-to-one correspondence, and the other ends of the N short umbrella ribs are hinged to the umbrella shaft chassis. The umbrella surface covers the N long umbrella ribs. The elastic force of the spring and the weight of the umbrella top weight plate are designed such that the vibration damping umbrella is in a retracted state in a static state.

[0007] Further, in the vibration damping device for umbrella-shaped transmission lines according to the present invention:

[0008] The relationship between the length of the umbrella shaft and the length of the spring is that when the umbrella surface is fully opened, the bottom of the umbrella top weight plate coincides with the top of the umbrella shaft chassis.

[0009] The umbrella top weight plate and the umbrella shaft are in a sliding fit.

[0010] The hinge structure at all hinge joints is composed of a hinge support and a pin. N hinge supports are circumferentially and evenly distributed at the outer edge of the umbrella top weight plate. A hinge support is provided in the middle of each long umbrella rib. N hinge supports are circumferentially and evenly distributed at the outer edge of the umbrella shaft chassis.

[0011] The wire clamp is formed by fixing two mutually embracing clamp blades with a threaded connection member.

[0012] The weight of the umbrella top weight plate is adjusted according to the vibration condition of the line to ensure that the vibration damping umbrella can open and close freely under the expected vibration intensity.

[0013] In use, the wire clamp is fixed to the transmission line. When the transmission line vibrates, the wire clamp and the umbrella shaft have the same displacement as the transmission line. Under the action of inertia, the umbrella top weight plate stretches the spring and moves downward. In cooperation with the hinge structure at all hinge joints, the umbrella surface opens, realizing an increase in the air resistance when the transmission line vibrates, thereby reducing the vibration amplitude of the transmission line. When the vibration of the transmission line tends to stop, the umbrella top weight plate moves upward under the action of the spring contraction force, and the vibration damping umbrella is retracted.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The vibration damping device has a simple structure and an easy-to-understand principle. By increasing the air resistance when the wire vibrates, the vibration of the wire is reduced, and the transmission of the wire vibration is weakened. It has a wide range of applicability. After calculating the spring elastic coefficient and length, the weight of the weight and the length of the umbrella ribs, they can be adjusted according to needs. The light structure of the device can reduce the wear of the transmission wire. It is easy to manufacture, transport and install, and has good economic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the anti-vibration umbrella in the retracted state of the umbrella-shaped transmission wire vibration damping device of the present invention;

[0017] Figure 2 is Figure 1 the side view of the anti-vibration umbrella in the retracted state of the umbrella-shaped transmission wire vibration damping device shown;

[0018] Figure 3 is Figure 1 the front view of the anti-vibration umbrella (the umbrella surface 15 is not drawn) in the opened state of the umbrella-shaped transmission wire vibration damping device shown;

[0019] Figure 4 is Figure 3 the top view of the anti-vibration umbrella in the opened state of the umbrella-shaped transmission wire vibration damping device shown.

[0020] In the figure:

[0021] 1 - left half page of the clamp, 2 - right half page of the clamp, 20 - through hole, 3 - bolt

[0022] 4 - nut, 5 - flat plate, 6 - spring, 7 - umbrella shaft

[0023] 8 - umbrella top weight plate, 9 - long umbrella rib, 10 - short umbrella rib, 11 - hinge support

[0024] 12 - pin, 13 - umbrella shaft chassis, 14 - transmission wire, 15 - umbrella surface DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described below in conjunction with the drawings and specific embodiments, but the following embodiments are by no means any limitation to the present invention.

[0026] As Figure 1 and Figure 2As shown in the figure, a vibration damping device for an umbrella-shaped transmission wire proposed by the present invention includes a wire clamp. In this embodiment, the wire clamp is composed of a left half clamp 1 and a right half clamp 2 that are fixed together by bolts 3 and nuts 4 after being clamped. A through hole 20 is formed between the two clamped clamp blades. A flat plate 5 parallel to the axis of the through hole 20 is fixed at the bottom of the left half clamp 1, and a vibration damping umbrella is fixed at the bottom of the flat plate 5. In the present invention, the structure of the wire clamp can also be selected as other types of wire clamps, as long as it can achieve a fastening effect, and lightweight is preferred.

[0027] As Figures 1 to 4 shown, the vibration damping umbrella includes an umbrella shaft 7, N long umbrella ribs 9, N short umbrella ribs 10, and an umbrella surface 15. In this embodiment, N = 6. The top end of the umbrella shaft 7 is fixed to the flat plate 3. A spring 6 and an umbrella top weight plate 8 are sequentially sleeved on the umbrella shaft 7 from top to bottom. One end of the spring 6 is fixed to the flat plate 3, and the other end of the spring 6 is fixed to the umbrella top weight plate 8. The umbrella top weight plate 8 is in sliding fit with the umbrella shaft 7.

[0028] An umbrella shaft chassis 13 is fixed at the bottom of the umbrella shaft 7. One end of each long umbrella rib 9 is hinged to the umbrella top weight plate 8 so that the long umbrella rib 9 can rotate; one end of the 6 short umbrella ribs 10 is correspondingly hinged to the middle of the 6 long umbrella ribs 9, and the other ends of the 6 short umbrella ribs 10 are hinged to the umbrella shaft chassis 13 so that the short umbrella ribs 10 can rotate. The hinge structure at all hinge joints is composed of a hinge support 11 and a pin 12; 6 hinge supports 11 are evenly distributed along the circumferential direction at the outer edge of the umbrella top weight plate 8, a hinge support 11 is provided in the middle of each long umbrella rib 9, and 6 hinge supports 11 are evenly distributed along the circumferential direction at the outer edge of the umbrella shaft chassis 13.

[0029] The umbrella surface 15 is adhesively bonded to the umbrella surface skeleton formed by the 6 long umbrella ribs 9, and the area of the umbrella surface 15 is sized so that the umbrella surface remains flat in the open state.

[0030] In the present invention, the radial dimension of the umbrella shaft chassis 13 at the bottom should be slightly larger than the radial dimension of the umbrella top weight plate 8 at the top to prevent damage caused by the mutual impact of the hinge structures.

[0031] In the present invention, the elastic force of the spring 6 and the weight of the umbrella top weight plate 8 are designed such that in the static state, the anti-vibration umbrella is in a closed state. The relationship between the length of the umbrella shaft 7 and the length of the spring 6 is that when the umbrella surface 15 is fully opened, the umbrella top weight plate 8 contacts the umbrella shaft chassis 13. The weight of the umbrella top weight plate 8 can be adjusted according to the line vibration conditions (such as calculated according to the starting wind speed or the starting acceleration of the wire) to ensure that the anti-vibration umbrella can open and close freely under the expected vibration intensity.

[0032] The relationship among the elastic coefficient and original length of the spring 6, the weight and thickness of the umbrella top weight plate 8, and the lengths of the umbrella shaft 7 and the short umbrella ribs 10 can be determined with reference to the following formula.

[0033]

[0034] Among them, L is the length of the umbrella shaft 7, l0 is the original length of the spring, k is the elastic coefficient of the spring, d is the thickness of the weight plate, m is the mass of the weight plate, g is the acceleration due to gravity, l1 is the length of the short umbrella rib, and a is the starting acceleration. The length of the long umbrella rib can be adjusted according to the need for vibration reduction. The larger it is, the stronger the vibration reduction effect, but it should be noted that if it is too long, there may be a problem of insufficient strength.

[0035] During use, the wire clamp 1 is fixed on the transmission wire 14. When the transmission wire 14 is in a static state or the environmental wind speed is small, the vibration-proof umbrella is in a retracted state. When the transmission wire 14 is subjected to a wind load and undergoes upward accelerated vibration, since the wire clamp and the umbrella shaft have the same displacement as the transmission wire 14, the umbrella top weight plate 8 will stretch the spring 6 downward under the action of inertia. When the umbrella body is subjected to the downward pressure of the umbrella top weight plate, the hinge structures at all hinge joints cause the long umbrella ribs 9 and the short umbrella ribs 8 to rotate from near the umbrella shaft 7 to away from the umbrella shaft 7, that is, from the vertical plane to the horizontal plane. The angles between the long and short umbrella ribs and the umbrella shaft 7 become larger, achieving Figure 3 and Figure 4 the opened umbrella state shown. According to the air resistance formula, air resistance is proportional to the force-bearing area. Therefore, when the transmission wire 14 enters the next vibration cycle, the air resistance of the transmission wire 14 will increase, and thus the vibration amplitude of the transmission wire 14 will decrease. When the vibration of the transmission wire 14 tends to slow down or stop, the spring 6 in the stretched state will apply an upward restoring tension to the umbrella top weight plate 8. The umbrella top weight plate 8 moves upward under the action of the contraction force of the spring 6, and the vibration-proof umbrella returns to Figure 1 Figure 2 the closed umbrella state shown.

[0036] In the present invention, under the condition of ensuring strength and function, each component can be light-weighted.

[0037] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many improvements and changes without departing from the purpose of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An umbrella-shaped transmission line vibration reduction device, comprising a wire clamp, characterized in that: A plate (5) parallel to the wiring direction of the line clamp is fixed at the bottom of the line clamp, and a vibration reduction umbrella is fixed at the bottom of the plate (5). The vibration reduction umbrella comprises an umbrella shaft (7), N long umbrella ribs (9), N short umbrella ribs (10) and an umbrella surface (15). The top end of the umbrella shaft (7) is fixed to the plate (3), and a spring (6) and an umbrella top weight plate (8) are sequentially mounted on the umbrella shaft (7) from top to bottom. One end of the spring (6) is connected to the plate (3). The umbrella shaft (7) is fixed to the umbrella top weight plate (8); an umbrella shaft chassis (13) is fixed to the bottom of the umbrella shaft (7); one end of each long rib (9) is hinged to the umbrella top weight plate (8); one end of the N short ribs (10) is hinged to the middle of the N long ribs (9) in a one-to-one correspondence; the other ends of the N short ribs (10) are hinged to the umbrella shaft chassis (13); the umbrella surface (15) covers the N long ribs (9); The elastic force of the spring (6) and the weight of the umbrella top weight plate (8) are designed according to the fact that the anti-vibration umbrella is in a folded state when in a static state.

2. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: The length of the umbrella shaft (7) and the length of the spring (6) are such that when the umbrella surface (15) is fully opened, the bottom surface of the umbrella top weight plate (8) coincides with the top surface of the umbrella shaft bottom plate (13).

3. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: The umbrella top weight plate (8) and the umbrella shaft (7) are in sliding fit.

4. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: The hinge structures at all hinged locations are composed of hinge supports (11) and pins (12); N hinge supports (11) are evenly distributed along the circumference at the outer edge of the umbrella top weight plate (8); a hinge support (11) is provided at the middle of each long rib (9); and N hinge supports (11) are evenly distributed along the circumference at the outer edge of the umbrella shaft bottom plate (13).

5. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: The wire clamp is composed of two clamping hoop leaves that are fixed after being embraced, and a through hole (20) for routing the wire is formed between the two embraced clamping hoop leaves.

6. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: The relationship between the elastic coefficient and original length of the spring (6), the weight and thickness of the umbrella top weight plate (8), and the length of the umbrella shaft (7) and the short rib (10) is as follows: ma=2kl1 Wherein, L is the length of the umbrella shaft 7, l0 is the original length of the spring, k is the spring elastic coefficient, d is the thickness of the weight plate, m is the mass of the weight plate, g is the gravity acceleration, l1 is the length of the short rib, and a is the starting acceleration; The length of the long rib (9) is adjusted according to the need for vibration reduction. On the premise of ensuring strength, the longer the length of the long rib (9), the stronger the vibration reduction effect.

7. The umbrella-shaped transmission line vibration reduction device according to claim 6, characterized in that: The weight of the umbrella top weight plate (8) is adjusted according to the vibration conditions of the line to ensure that the anti-vibration umbrella can be opened and closed freely under the expected vibration intensity.

8. The umbrella-shaped transmission line vibration reduction device according to claim 1, characterized in that: When in use, the wire clamp (1) is fixed on the power transmission wire (14). When the power transmission line (14) vibrates, the wire clamp and the umbrella shaft produce the same displacement as the power transmission line (14), and the weight plate (8) on the top of the umbrella stretches the spring (6) to move downward under the action of inertia, and the umbrella cover (15) opens in coordination with the hinged structures at all hinged joints, thereby increasing the air resistance of the power transmission line (14) when it vibrates, thereby reducing the vibration amplitude of the power transmission line (14); When the vibration of the power transmission line (14) tends to stop, the umbrella top weight plate (8) moves upward under the action of the contraction force of the spring (6), and the anti-vibration umbrella is folded.

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