CN102509592B - Damping insulator for transmission conductor - Google Patents

Abstract

A shock-absorbing insulator for power transmission wires, comprising a plurality of umbrella discs connected up and down, the lower ends of the umbrella discs are connected with cable clips, and at least one buffer is connected between the plurality of umbrella discs. The buffer includes a spring, an elastic buffer and a magnetic fluid fluid buffer. The invention provides a shock-absorbing insulator for power transmission wires, which overcomes the alternating load generated by the power transmission wires by adding a buffer between the umbrella disks, and effectively protects the power transmission iron tower.

Description

Shock-absorbing insulators for power transmission lines

technical field

The invention relates to the field of insulators for power transmission, in particular to a shock-absorbing insulator for power transmission wires.

Background technique

According to the statistics of the State Grid Department, as of the end of 2009, my country's existing 110 (66) KV and above high-voltage transmission lines totaled about 553,382 kilometers, and the number of transmission towers was conservatively estimated to be 1.8 million, and it is still increasing rapidly. The number is huge. In recent years, natural disasters such as violent storms have occurred frequently, and many transmission towers have been damaged or even collapsed, causing huge losses to the power grid.

Contents of the invention

The technical problem to be solved by the present invention is to provide a shock-absorbing insulator for power transmission wires, which can prevent the transmission iron tower from being damaged due to the swinging of the power transmission wires.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a shock-absorbing insulator for power transmission wires, including a plurality of umbrella discs connected up and down, the lower ends of the umbrella discs are connected with cable clips, and the plurality of umbrella discs are also connected There is at least one buffer.

The buffer is an elastic buffer or a magnetic fluid buffer.

In the elastic buffer, a piston is installed in the casing, and a plurality of damping holes are arranged on the piston.

In the magnetic fluid fluid buffer, a piston is installed in the housing, at least one damping hole is arranged on the piston, the housing is filled with magnetic fluid fluid, and at least one group of coils is arranged near the damping hole, and the control wire of the coil is connected from the piston rod wear out.

In the magnetic fluid fluid buffer, multiple damping holes are evenly distributed on the circumference, and multiple groups of coils are located on the outer ring and/or inner ring of the circumference formed by the multiple damping holes.

In the magnetic fluid buffer, each damping hole is provided with a coil coaxial with the damping hole.

In the magnetic fluid buffer, each orifice has a curved path.

A return spring for resetting the piston is also provided.

A buffer layer is also provided in the rodless chamber of the housing.

After careful investigation, the reason for the damage of the transmission tower is that the insulators used on the transmission towers in my country are not shock-absorbing structures. As shown in Figure 7, if the transmission wire is directly connected to the transmission tower, the vibration generated by the wire will be directly Passed to the transmission tower. The span between the transmission towers is generally more than 500 meters. The wire between the two towers is like a giant skipping rope. Leading cause of destructive damage. Especially when changing direction during the swinging process, the instantaneous load produces a superimposed effect, and its destructive power is huge.

Therefore, in the present invention, an energy-absorbing mechanism is added on the insulator to overcome the alternating load, especially the instantaneously superimposed alternating load brings destructive damage to the transmission tower.

The invention provides a shock-absorbing insulator for power transmission wires, which overcomes the alternating load generated by the power transmission wires by adding a buffer between the umbrella disks, and effectively protects the power transmission iron tower.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a cross-sectional structure diagram of the buffer in the present invention.

Fig. 3 is a sectional view of the piston of the magnetic fluid buffer in the present invention.

Fig. 4 is a sectional view of the optimized piston part of the magnetic fluid buffer in the present invention.

Fig. 5 is a cross-sectional view of the further optimized piston part of the magnetic fluid buffer in the present invention.

Fig. 6 is a cross-sectional view of the structure of the elastic buffer in the present invention.

Fig. 7 is a schematic diagram of installation of an insulator in the prior art.

Detailed ways

Example 1:

As shown in Figure 1, a shock-absorbing insulator for power transmission wires, including a plurality of umbrella disks 1 connected up and down, the lower end of the umbrella disk 1 is connected with a wire clip 3, and at least one buffer 2 is connected between the multiple umbrella disks 1 .

The buffer 2 is a spring or elastic buffer. A separately arranged spring (not shown in the figure) can effectively reduce the alternating load, especially to overcome the superimposed effect of the instantaneous load when the direction is changed during the swinging process.

In an optimized solution, as shown in FIG. 6 , in the elastic buffer used, a piston 27 is installed in the housing 23 and a plurality of damping holes 25 are arranged on the piston 27 . A return spring for returning the piston 27 is also provided. In this example, the combination of elastic elements such as springs and dampers further reduces the oscillation because the damping curves of the two are different. The return spring can be arranged in the rod chamber, as shown in FIG. 6 , or in the rodless chamber, or in both the rod chamber and the rodless chamber, or outside the housing 23 . A buffer layer 28 is also provided in the rodless chamber of the housing 23 to prevent the piston 27 from directly colliding with the housing 23 and has a buffering effect.

Example 2:

As shown in Figure 1, a shock-absorbing insulator for power transmission wires, including a plurality of umbrella disks 1 connected up and down, the lower end of the umbrella disk 1 is connected with a wire clip 3, and at least one buffer 2 is connected between the multiple umbrella disks 1 .

The buffer 2 is a magnetic fluid buffer.

As shown in Figure 2, in the magnetic fluid fluid buffer buffer, a piston 27 is installed in the housing 23, and at least one damping hole 25 is provided on the piston 27, and the magnetic fluid fluid 24 is filled in the housing 23, At least one set of coils 26 is arranged near the damping hole 25 , and the control wires 21 of the coils 26 pass through the piston rod 22 . The magnetic fluid fluid is a suspending fluid in which magnetizable soft iron particles are suspended in a hydrocarbon solution, and the fluidity of the magnetic fluid fluid is changed by changing the current of the coil 26, thereby changing the damping coefficient of the damper. The magnetic fluid buffer can change the coil current according to the vibration amplitude information (such as wind speed) of the high-voltage wire to control the shock absorption capacity of the magnetic fluid buffer to adapt to the shock absorption of the transmission wire under different conditions. In this way, the vibration generated by the wire swing can be "absorbed" through the buffer, and not transmitted to the transmission tower, which plays a role in protecting the transmission tower.

In an optimized solution, the multiple damping holes 25 are evenly distributed on the circumference, and the multiple groups of coils 26 are located on the outer ring and/or inner ring of the circumference formed by the multiple damping holes 25 . As shown in Figure 3 and Figure 4, this structure is more convenient for processing and installation.

In a further optimized solution, each damping hole 25 is externally provided with a coil 26 coaxial with the damping hole 25 . As shown in Figure 5. This structure is more efficient.

In a further optimized solution, each damping hole 25 has a curved path, that is, each damping hole 25 is no longer parallel to the axis, but curved, such as a spiral shape, thereby effectively increasing the damping The length of the hole 25 improves the damping effect, which is not shown in the figure. Adopting this structure can effectively reduce the volume of the buffer.

In an optimized solution, a return spring for restoring the piston 27 is also provided. Under the action of gravity of the power transmission wire, the piston 27 always tends to stay on the upper part of the housing 23, and this state is unfavorable for absorbing the vibration energy of the wire, so a return spring is used to assist the piston 27 to stay on the upper part of the housing 23 The middle part is beneficial. As in Embodiment 1, the return spring can be arranged in the rod chamber or the rodless chamber, or both in the rod chamber and the rodless chamber, or arranged outside the housing 23, which is not shown in the figure.

A buffer layer 28 is also provided in the rodless cavity of the housing 23 . It is used to prevent the piston 27 from directly colliding with the housing 23 and also has a buffering effect.

Claims (5)

1., for a damping insulator for transmission pressure, comprise multiple umbrella disk (1) connected up and down, umbrella disk (1) lower end is connected with wire clamp (3), it is characterized in that: be also connected with at least one buffer (2) between multiple umbrella disk (1);

Described buffer (2) is elastic buffer or magnetic current liquid buffer;

In described elastic buffer, be provided with piston (27) in housing (23), piston (27) is provided with multiple damping hole (25);

In described magnetic current liquid buffer, piston (27) is installed in housing (23), piston (27) is provided with at least one damping hole (25), magnetic current liquid (24) is filled with in housing (23), be provided with at least one group of coil (26) near damping hole (25), the pilot (21) of coil (26) passes from piston rod (22);

Also be provided with the back-moving spring for making piston (27) reset.

2. a kind of damping insulator for transmission pressure according to claim 1, it is characterized in that: in described magnetic current liquid buffer, multiple damping hole (25), circumferentially uniform, organizes outer ring and/or inner ring that coil (26) is positioned at the circumference that multiple damping hole (25) forms more.

3. a kind of damping insulator for transmission pressure according to claim 1, is characterized in that: in described magnetic current liquid buffer, is provided with the coil (26) with damping hole (25) concentric outside each damping hole (25).

4. a kind of damping insulator for transmission pressure according to claim 1, is characterized in that: in described magnetic current liquid buffer, each damping hole (25) has bending path.

5. a kind of damping insulator for transmission pressure according to claim 1, is characterized in that: be also provided with resilient coating (28) in the rodless cavity of housing (23).