CN209434600U - Only pole type lightning protection needle of subsidiary damping unit - Google Patents

Abstract

The utility model relates to the wind-induced vibration response field of power transmission and transformation equipment. It is a single-column lightning rod with a damping device, which includes a steel pipe body and a lightning rod needle point. The steel pipe body is a hollow pipe body. A damping part is suspended inside by a connecting rope, an elastic part is arranged between the damping part and the inner wall of the steel pipe main body, one end of the elastic part is connected with the damping part, and the other end is connected with the inner wall of the steel pipe main body. The utility model has a reasonable and compact structure and is easy to use. By setting the suspended damping part and connecting the elastic part between the damping part and the inner wall of the steel pipe main body, a large amount of damping can be generated when the wind-induced vibration of the whole device occurs, and the vibration can be accelerated. Energy loss, so as to achieve a good damping effect and prolong the service life.

Description

Single column lightning rod with damping device

technical field

The utility model relates to the wind-induced vibration response field of power transmission and transformation equipment, and is a single-column lightning rod with a damping device.

Background technique

In the substation, the lightning rod is usually installed to guide the lightning current into the ground, so as to protect nearby equipment or buildings lower than it from direct lightning damage. On the substation structure of 500kV and below, the lightning rod often adopts a single-column structure.

Due to the large slender ratio of the existing single-column lightning rod, relatively small stiffness, and poor damping effect, wind-induced vibration in the downwind direction is prone to occur under the action of pulsating wind; long-term wind-induced vibration, for the single-column lightning rod Will generate alternating reciprocating loads. Under the long-term action of this alternating reciprocating load, the welds or bolts at the root of the single-column lightning rod or the flange joints are prone to wind-induced fatigue damage, that is, fatigue cracks and sudden fractures occur at low stress levels, thereby shortening the entire length. The service life of the lightning rod device.

On September 13, 2015, the lightning rod above the 750kV incoming line frame of the State Grid Xinjiang Electric Power 750kV Dabancheng Substation broke and fell in strong winds. Inspection found that the dropped bolts were all broken from the middle. The cause of the accident was that the long-term wind-induced vibration of the single-column lightning rod caused fatigue and cracking of the bolt metal, continuous corrosion, and a reduction in the effective working area, until the bolt was completely broken when working in a windy weather, and eventually the lightning rod fell as a whole.

The lightning rod is a typical high-rise structure, and its calculation diagram is a cantilever beam, which can be calculated as a tension-compression component. Compared with the impact of earthquakes, although the instantaneous damage caused by the wind vibration effect of the structure is small, the frequent disasters that occur are large, the frequency is high, and the impact range is wide, so the wind vibration effect is more significant. Therefore, it is necessary to adopt relevant vibration reduction measures to reduce the vibration of the lightning rod under wind load.

Contents of the invention

The utility model provides a single-column lightning rod with a damping device, which overcomes the shortcomings of the prior art and can effectively solve the problems of poor damping effect and short service life of the existing single-column lightning rod.

The technical solution of the utility model is achieved through the following measures: a single-column lightning rod with a damping device, including a steel pipe body and a lightning rod needle point, the steel pipe body is a hollow pipe body, the lightning rod needle point is installed on the upper end of the steel pipe body, and the steel pipe body A damping part is suspended inside by a connecting rope, an elastic part is arranged between the damping part and the inner wall of the steel pipe main body, one end of the elastic part is connected with the damping part, and the other end is connected with the inner wall of the steel pipe main body.

Below is the further optimization or/and improvement to above-mentioned utility model technical scheme:

There may be multiple elastic members, and all the elastic members are arranged at intervals along the circumference of the steel pipe main body.

The above-mentioned steel pipe body may include at least one steel pipe monomer that is fixedly connected and connected sequentially from bottom to top. Each steel pipe monomer is provided with a damping piece inside, and all the damping pieces are sequentially connected by connecting ropes from bottom to top. It is connected to the top wall inside the main body of the steel pipe through a connecting rope.

The above-mentioned damping elements in each steel pipe body can be arranged at 1/2 to 3/4 of the height of the steel pipe body.

The above-mentioned damping element can be a heavy metal ball.

The utility model has a reasonable and compact structure and is easy to use. By setting the suspended damping part and connecting the elastic part between the damping part and the inner wall of the steel pipe main body, a large amount of damping can be generated when the wind-induced vibration of the whole device occurs, and the vibration can be accelerated. Energy loss, so as to achieve a good damping effect and prolong the service life.

Description of drawings

Accompanying drawing 1 is the partial cross-sectional structural schematic diagram of the front view of the best embodiment of the utility model.

The codes in the accompanying drawings are: 1 is the needle point of the lightning rod, 2 is the connecting rope, 3 is the damping part, 4 is the elastic part, and 5 is the single steel pipe.

Detailed ways

The utility model is not limited by the following examples, and the specific implementation manner can be determined according to the technical scheme of the utility model and actual conditions.

In this utility model, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout method of Fig. The relationship is determined according to the layout direction of the drawings in the description.

Below in conjunction with embodiment and accompanying drawing, the utility model is further described:

As shown in Figure 1, the single-column lightning rod with a damping device includes a steel pipe body and a lightning rod tip 1, the steel tube body is a hollow tube, the lightning rod tip 1 is installed on the upper end of the steel tube body, and the inside of the steel tube body is suspended by a connecting rope 2. The damping part 3 is provided with an elastic part 4 between the damping part 3 and the inner wall of the steel pipe main body. One end of the elastic part 4 is connected with the damping part 3 and the other end is connected with the inner wall of the steel pipe main body. According to requirements, the lightning rod needle point 1 is fixedly installed on the upper end of the steel pipe body through the flange, the lower end of the steel pipe body is fixedly installed on the base frame through the flange, and the upper end of the connecting rope 2 is fixedly connected on the top wall inside the steel pipe body, so that the damper 3 can be suspended inside the main body of the steel pipe, and the elastic part 4 is a compression spring. Under normal conditions, the compression spring maintains its original length. When the main body of the steel pipe is vibrated by the wind load, the damping part 3 suspended inside the main body of the steel pipe can also swing, resulting in A large amount of damping, in addition, the damping member 3 will continue to compress or stretch the elastic member 4 during the swing process, and the damping member 3 will overcome the elastic potential energy of the elastic member 4 to do work during the swing process, thereby increasing the loss of vibration energy , so that the wind-induced vibration energy of the whole device declines rapidly, that is, the setting of the damping member 3 and the elastic member 4 can have a good damping effect on the wind-induced vibration of the whole device, reduce the vibration fatigue of the bolts at the flange joints, and prolong the service life. life.

According to actual needs, the above-mentioned single-column lightning rod can be further optimized or/and improved:

As shown in Fig. 1 , the inner wall of the steel pipe body is distributed with a plurality of elastic parts 4 at intervals along the circumference. According to requirements, there can be four elastic parts 4 and they are all at the same height. The four elastic parts 4 are evenly spaced along the circumferential direction of the inner wall of the steel pipe body. The arrangement of the four elastic parts 4 further accelerates the loss of vibration energy and improves the Damping effect.

As shown in Figure 1, the steel pipe body includes at least one steel pipe unit 5 that is fixedly connected from bottom to top and whose inner cavity is connected. Each steel pipe unit 5 is provided with a damping member 3 inside, and all the damping members 3 are composed of The connection from bottom to top is sequentially connected by connecting rope 2 , and the uppermost damping element 3 is connected on the top wall inside the steel pipe main body by connecting rope 2 . According to requirements, the steel pipe body includes three steel pipe monomers 5, and the three steel pipe monomers 5 are fixed and installed together through flanges from bottom to top. 3 and the arrangement of the elastic member 4 can ensure that each steel pipe unit 5 is subject to a greater damping effect during wind-induced vibration, thereby reducing the vibration fatigue of the bolts at the flange connection of each steel pipe unit 5 and extending the length of the steel pipe body. In addition, since all the damping parts 3 are sequentially connected by the connecting rope 2 from bottom to top, compared with each damping part 3 being connected to the inner fixed wall of the steel pipe body through the connecting rope 2 alone, the damping parts in the utility model The amplitude of the swing of 3 will be larger, that is, the damping generated by the swing of the damping member 3 is greater, which further improves the damping effect.

As shown in FIG. 1 , the damping element 3 in each steel pipe unit 5 is set at 1/2 to 3/4 of the height of the steel pipe unit 5 . According to requirements, the damping member 3 in each steel pipe unit 5 is arranged at 2/3 of the height of the steel pipe unit 5, and the damping member 3 produces the largest damping when swinging.

As shown in Figure 1, the damping element 3 is a heavy metal ball. The metal heavy ball is small in size and high in mass, low in cost, and produces large damping when swinging.

The above technical features constitute the best embodiment of the utility model, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (8)

1. a kind of only pole type lightning protection needle of subsidiary damping unit, including steel pipe main body and lightning rod needle point, steel pipe main body are hollow Tube body, lightning rod needle point are mounted on steel pipe main body upper end, it is characterised in that steel pipe body interior is hung with damping by connecting rope Part is equipped with elastic component between damping piece and steel pipe main body inner wall, elastic component one end is connected with damping piece, the other end and steel pipe main body Inner wall connection.

2. only pole type lightning protection needle of subsidiary damping unit according to claim 1, it is characterised in that steel pipe main body inner wall edge Circumferentially-spaced has multiple elastic components.

3. only pole type lightning protection needle of subsidiary damping unit according to claim 1 or 2, it is characterised in that the steel pipe main body Including at least one the steel pipe monomer being fixedly connected sequentially from the bottom to top and inner cavity is connected to, resistance is equipped with inside each steel pipe monomer Damping member, all damping pieces pass sequentially through connecting rope connection from the bottom to top, and the damping piece of the top is connected to steel by connecting rope On the roof of pipe body interior.

4. only pole type lightning protection needle of subsidiary damping unit according to claim 1 or 2, it is characterised in that each steel pipe monomer 1/2 to 3/4 place of the steel pipe monomer height is arranged in interior damping piece.

5. only pole type lightning protection needle of subsidiary damping unit according to claim 3, it is characterised in that in each steel pipe monomer Damping piece 1/2 to 3/4 place of the steel pipe monomer height is set.

6. only pole type lightning protection needle of subsidiary damping unit described according to claim 1 or 2 or 5, it is characterised in that the damping Part is metal heavy ball.

7. only pole type lightning protection needle of subsidiary damping unit according to claim 3, it is characterised in that the damping piece is gold Belong to heavy ball.

8. only pole type lightning protection needle of subsidiary damping unit according to claim 4, it is characterised in that the damping piece is gold Belong to heavy ball.