CN202840433U - Tuning fork-type vibration-prevention hammer - Google Patents

Abstract

The utility model provides a tuning fork-type vibration-prevention hammer in order to effectively eliminate corona loss and corona noise which are produced in a 330kV-transmission line by a hammer head in high-altitude areas below 4000 m and achieve energy-saving and environmentally-friendly properties. The vibration-prevention hammer includes a steel strand, a wire clamp pressingly fixed at the center of the steel strand, and hammer heads fixed at two ends of the wire clamp, wherein the hammer heads are in turning fork-type structures; each hammer head is provided with an external side end, a central connecting structure and an internal side end which are successively arranged along the central axis direction of the hammer head; the external side end of each hammer head is a cylinder with a hemispherical end surface, and an installation hole penetrating the cylinder is arranged inside the cylinder along the central axis direction of the cylinder, wherein the installation hole shares the same axis with the cylinder; an upper surface of the internal side end of each hammer is in a tuning fork-type structure, and a lower surface of the internal side end of each hammer is in a cylindrical-surface structure; two ends of the hammer heads are smoothly connected through curved surfaces; and the interior of each central connecting structure is provided with a lightening hole.

Description

A tuning fork type anti-vibration hammer

technical field

The utility model belongs to the field of damping devices for overhead power transmission lines, in particular to a tuning fork type anti-vibration hammer. the

Background technique

The western region of my country is located on a plateau. According to the geographical characteristics of the western region and its energy development planning, the demand for electricity is increasing day by day. However, with the increase of altitude, the problem of high-altitude corona is very prominent, and corona effects such as corona loss caused by corona discharge will affect the safe and economical operation of transmission lines. Therefore, it is very necessary to prevent corona discharge and corona noise of transmission lines in high altitude areas. the

Corona is caused by the non-uniform electric field generated by the uneven conductor. When the voltage rises to a certain value, in the part with a small curvature radius in the uneven electric field, the surface electric field strength exceeds the breakdown strength of air molecules, and discharge will occur. A corona is formed. Corona consumes energy, and the pulsed electromagnetic waves generated by corona discharge will interfere with radio and high-frequency communications; it will also corrode the surface of the conductor, thereby reducing the service life of the conductor. At present, the electromagnetic environment has become an important factor that must be considered in the design, construction and operation of transmission lines in high altitude areas. the

Corona noise is produced by conductor partial discharge or corona, which is closely related to the voltage level and the altitude of the transmission line. The higher the voltage level and the complicated electrical wiring, the higher the local field strength on the surface of the charged conductor. Partial discharge or corona is more likely to occur; metalware in areas with higher altitudes is more likely to have corona discharge on its surface. the

The design and application conditions of charged metal fittings are related to their surface working field strength. When the surface working field strength is higher than the corona initiation field strength, corona discharge will be generated on the surface of the metal fittings. The size of the working field strength of the fittings is closely related to the structure of the fittings. Studies have shown that the smaller the curvature radius of the fittings surface, the higher the working field strength on the surface under the same voltage, the more likely corona discharge will occur at this place, resulting in electric shock. Halo noise and power loss are not conducive to energy saving and environmental protection. the

There are many types of anti-vibration hammers, such as bell type, tuning fork type, pre-twisted wire type and so on. All kinds of anti-vibration hammers can be used on transmission lines, but their anti-vibration performance is slightly different, because different anti-vibration hammers have different resonant frequencies. In high altitude areas, the anti-halo performance of fittings has become an important factor worthy of attention, and the same is true for anti-vibration hammers. the

According to the on-site measurement of the electromagnetic environment of a large number of 330kV transmission lines, it is found that the corona discharge phenomenon of the conventional anti-vibration hammer is more prominent in the range of 1000-4000m above sea level, and the corona initiation parts of the anti-vibration hammer are mainly concentrated at both ends of the hammer head, and As the altitude increases, its discharge intensity and corona noise increase accordingly. the

The anti-vibration hammer with tuning fork structure belongs to the Stockbridge anti-vibration hammer. Suspended on the wire as a fulcrum. After the anti-vibration hammer is installed on the wire, the two hammer heads vibrate with the vibration of the wire, which makes the steel strands slip relative to each other to generate frictional damping force. The anti-vibration hammer uses the damping generated by the friction between the strands of the steel strand to consume the vibration energy of the wire system. The vibration power characteristics of the anti-vibration hammer are mainly related to the mass of the hammer head, the position of the center of mass, the moment of inertia and the length of the steel strand; the anti-halation performance is mainly related to the radius of curvature of the outer arc surface at both ends of the hammer head. At present, the conventional structure of an anti-vibration hammer with a tuning fork structure is: the upper and lower surfaces of one end of the hammer head are both a tuning fork structure, for example, the patent number is CN200420033437. CN02220409.1 invented a utility model patent titled "anti-vibration hammer for electric fittings with large cross-section wire", that is, the split part of the tuning fork structure runs through one end of the entire hammer head, which will make the end of the hammer head of the anti-vibration hammer The curvature becomes smaller, reducing the corona inception voltage of the anti-vibration hammer. the

Contents of the invention

The purpose of the utility model is to provide a tuning fork type anti-vibration hammer. The anti-vibration hammer adopts a hammer head structure with wide ends and a narrow middle to optimize the curvature radius of the end of the hammer head and improve the electric field distribution on the surface of the hammer head, thereby effectively preventing the hammer head from Corona loss and corona noise are generated in 330kV transmission lines in high altitude areas below 4000m, so as to achieve the purpose of energy saving and environmental protection. the

In order to realize the above-mentioned purpose of the invention, the technical scheme that the utility model takes is:

A tuning fork type anti-vibration hammer, the anti-vibration hammer includes steel strands, clamps pressed and fixed on the steel strands, hammer heads fixed at both ends of the steel strands, and the hammer heads are tuning fork structures , the improvements are:

The hammer head is sequentially provided with an outer end, an intermediate connection structure and an inner end along the direction of its central axis;

The outer end of the hammer head is a cylinder with a hemispherical end face, and the interior of the cylinder is provided with a mounting hole passing through the cylinder along its central axis, and the mounting hole is coaxial with the cylinder;

The upper surface of the inner end of the hammer head is a tuning fork structure, and the lower surface is a cylindrical structure;

The two ends of the hammer head are smoothly connected by a curved surface, and a lightening hole is opened inside the intermediate connecting structure. the

Another preferred technical solution of the present invention is: the mounting hole and the weight reducing hole communicate with each other and are coaxial. the

Another preferred technical solution of the present invention is: the hammer head is made of cast steel. the

Another preferred technical solution of the present invention is: the steel strand is fixed on the hammer head by cold pressure riveting. the

Another preferred technical solution of the present invention is: the diameter of the installation hole is 0.1-0.5 mm larger than the diameter of the steel strand. the

的锥形孔。  Another preferred technical solution of the present invention is: both ends of the mounting hole are provided with a taper greater than

tapered hole.

Due to the adoption of the above technical solution, compared with the prior art, the beneficial effects of the utility model include:

1) Anti-halo performance

Under the rated voltage of 330kV, the conventional tuning fork anti-vibration hammer has a maximum surface field strength of 31kV/cm through simulation calculations, far exceeding the limit value of the working field strength on the surface of metal fittings in high altitude areas. Altitude use. the

The tuning fork type anti-vibration hammer has undergone structural improvement, increasing the radius of curvature of the weak point, optimizing the length and height of the hammer head, and making the lower surface of the hammer head close to the clamp into a whole cylindrical surface, which greatly improves The anti-halo performance of the anti-vibration hammer is improved. The tuning fork type anti-vibration hammer with this structure is simulated and calculated, and the maximum field strength on the surface is reduced to 21kV/cm. The results of the corona test show that under the condition of simulating an altitude of 4000 meters, the corona inception voltage of the anti-vibration hammer of this structure is 385kV, which is much higher than the rated operating voltage of 330kV, which effectively suppresses the occurrence of corona and realizes energy saving and environmental protection the goal of. the

2) Anti-vibration performance

Compared with the conventional tuning fork anti-vibration hammer, the total mass of the anti-vibration hammer of the tuning fork type anti-vibration hammer of this structure remains basically unchanged; from the test results of power characteristics, there are four resonance frequencies. The deviation of frequency, second frequency and third frequency is small, and the fourth frequency drops by 10.9%, which is closer to the center of the frequency range of the wire's breeze vibration, which is more beneficial to anti-vibration. At the same time, the power at the first frequency and the second frequency of the conventional structure is higher, and the spectral peak is sharper, resulting in a peak-to-valley ratio exceeding the standard (greater than 5); the power at the first and second frequency of the structure has decreased, and the peak-to-valley ratio meets Requirements (less than 5), generally speaking, the anti-vibration performance of the anti-vibration hammer of this structure is more ideal. the

3) The anti-vibration hammer of this utility model is suitable for 330kV transmission lines in high-altitude areas with an altitude of 4000 meters and below. the

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described. the

Figure 1 is a schematic diagram of the structure of the anti-vibration hammer;

Figure 2 is a front view of the hammer head;

Figure 3 is a right view of the hammer head;

Figure 4 is a top view of the hammer head;

Figure 5 is a front view of another structure of the tup;

Figure 6 is a right view of another structure of the hammer head;

Fig. 7 is another structure plan view of tup;

Figure 8 is a schematic diagram of the clamp structure;

Figure 9 is a schematic diagram of the power characteristic curve of a conventional tuning fork type anti-vibration hammer;

Fig. 10 is a schematic diagram of the power characteristic curve of the tuning fork type anti-vibration hammer of the present invention;

Reference signs:

1-hammer head, 2-weight reduction hole, 3-steel strand, 4-clamp, 5-installation hole. the

Detailed ways

Below in conjunction with example the utility model is described in detail. the

The utility model is aimed at the anti-vibration hammer of the tuning fork structure, and adopts a hammer head structure with wide ends and a narrow middle. By rationally designing the structural type of the hammer head, the outer end of the hammer head is designed as a hemispherical shape, and the inner end has a tuning fork-shaped opening. The lower end surface is an integral cylindrical surface, and holes are dug inside the intermediate connection structure to reduce weight and properly control the overall quality of the hammer head. After this design, the radius of curvature at the end of the hammer head is optimized, and the electric field distribution on the surface of the hammer head is improved, thereby effectively preventing the hammer head from generating corona loss and corona noise in the 330kV transmission line at a high altitude below 4000m, and achieving energy saving and environmental protection. Purpose. the

The tuning fork type anti-vibration hammer optimizes the surface curvature radius of the hammer head to improve its anti-halo performance, and at the same time, changes the internal structure of the hammer head to ensure its anti-vibration performance. The tuning fork type anti-vibration hammer with this structure can reduce the 330kV Corona noise and corona loss of transmission line anti-vibration hammers. the

The anti-vibration hammer includes: a hammer head 1, a steel strand 3, a wire clamp 4 and accessories thereof. See attached picture 1. the

The hammer head includes two structural types, as shown in accompanying drawings 2-4 and 5-7 respectively. the

As shown in accompanying drawings 2-4, the hammer head 1 is a tuning fork structure, and the total length of the hammer head is 100mm≤L _1≤300mm . The length direction of the hammer head 1 is its central axis direction. The hammer head 1 is provided with an outer end, an intermediate connection structure and an inner end in sequence along the direction of its central axis. One end is the outer end.

The outer end of the hammer head 1 is a cylinder with a hemispherical end face, and the inside of the cylinder is provided with a mounting hole 5 passing through the cylinder along its central axis. The diameter φ1 of the mounting hole ₅ is determined by the diameter of the steel strand that matches it. , generally slightly larger than the diameter of the steel strand. The installation hole 5 is coaxial with the cylinder; the outer surface of the outer end is a smooth arc surface with a height of C ₁ ; the outer surface of the intermediate connection structure of the hammerhead 1 is a smooth curved surface, and the intermediate connection structure is provided with a weight-reducing hole 2 , the height of the lightening hole 2 is D ₁ ; C ₁ and D ₁ are determined according to the requirements of anti-corona performance and anti-vibration performance through simulation calculation, corona test and power characteristic test.

Accompanying drawing 3 hammer head side view shows, the side view of the inner side end of hammer head 1 is similar to U shape. The inner end of the hammer head 1 is a tuning fork type on the upper surface and an overall cylindrical surface on the lower surface. The width W ₁ of the outer edge of the tuning fork structure, the width W ₂ of the cylindrical surface of the lower surface and the height H ₁ are also obtained through simulation calculations, corona tests and power characteristics. Test to be sure. From the top view of the hammerhead structure in Figure 4, the inner end of the hammerhead 1 is a symmetrical structure, and its shape is smoothly connected by several curved surfaces with different curvature radii. The preparation material of the whole hammerhead 1 is cast steel, and the curved surfaces on the surface transition smoothly without casting defects, and the surface is treated with anticorrosion. See attached drawings 2 to 4.

As shown in Figure 5-7, another structural diagram of the hammer head, the hammer head 1 is a tuning fork structure, and the total length of the hammer head is 100mm≤L ₂ ≤ 280mm. The length direction of the hammer head 1 is its central axis direction. The hammer head 1 is provided with an outer end, an intermediate connection structure and an inner end in sequence along the direction of its central axis. One end is the outer end.

The outer end of the hammer head 1 is a cylinder with a hemispherical end face, and the inside of the cylinder is provided with a mounting hole 5 passing through the cylinder along its central axis. The diameter φ1 of the mounting hole ₅ is determined by the diameter of the steel strand that matches it. , generally slightly larger than the diameter of the steel strand. The mounting hole 5 is coaxial with the cylinder; the outer surface of the outer end is a smooth arc surface with a height of C ₂ ; the outer surface of the intermediate connection structure of the hammer head 1 is a smooth curved surface, and the intermediate connection structure is provided with a weight-reducing hole 2 , the height of the lightening hole 2 is D ₂ ; C ₂ and D ₂ are determined according to the requirements of anti-corona performance and anti-vibration performance through simulation calculation, corona test and power characteristic test.

The side view of the hammer head shown in Figure 6 shows that the side view of the inner end of the hammer head 1 is U-shaped. The inner end of the hammer head 1 is also a tuning fork type on the upper surface and an overall cylindrical surface on the lower surface. The outer edge width W ₃ of the tuning fork structure, the cylindrical surface width W ₄ and the height H ₂ of the lower surface are also obtained through simulation calculations, corona tests and power Characteristic test to confirm. From the top view of the hammer head structure in Figure 7, the inner end of the hammer head is a symmetrical structure, and the shape is smoothly connected by several curved surfaces with different curvature radii. The preparation material of the whole hammerhead 1 is cast steel, and the curved surfaces on the surface transition smoothly without casting defects, and the surface is treated with anticorrosion. See accompanying drawings 5 to 7.

The steel strand 3 is usually fixed on the hammerhead 1 by cold pressure riveting. the

The wire clamp 4 usually includes a wire clamp body, a wire clamp cover plate, spacers, bolts, washers and nuts. The wire clamp body and cover plate are made of cast aluminum alloy, and the surface structure is smoothly connected without casting defects. There is no crack when it is solid, and the chamfer of the nut is downward. The schematic diagram of the cable clamp structure is shown in Figure 8. the

The anti-dizziness performance of the tuning fork type anti-vibration hammer of the utility model is as follows:

Under the rated voltage of 330kV, the conventional tuning fork anti-vibration hammer has a maximum surface field strength of 31kV/cm through simulation calculations, far exceeding the limit value of the working field strength on the surface of metal fittings in high altitude areas. Altitude use. the

The tuning fork type anti-vibration hammer has been improved in structure, the radius of curvature of the weak point is increased, the length and height of the hammer head are optimized, and the lower surface of the hammer head 1 close to the clamp is made into a whole cylindrical surface, greatly The anti-stun performance of the anti-vibration hammer has been improved. The tuning fork type anti-vibration hammer with this structure is simulated and calculated, and the maximum field strength on the surface is reduced to 21kV/cm. According to the results of the corona test, under the simulated altitude of 4000 meters, the corona inception voltage of the anti-vibration hammer of this structure is 385kV, which is much higher than the rated operating voltage of 330kV, which effectively suppresses the occurrence of corona and realizes energy saving and environmental protection the goal of. the

The anti-vibration performance of the tuning fork type anti-vibration hammer of the utility model is as follows:

Fig. 9 is a schematic diagram of a power characteristic curve of a conventional tuning fork type anti-vibration hammer, and Fig. 10 is a schematic diagram of a power characteristic curve of a tuning fork type anti-vibration hammer of the present invention; one group of power characteristic tests adopts 3 parallel samples, and the 3 curves in the figure correspond to 3 Parallel samples. the

Compared with the conventional tuning fork anti-vibration hammer, the total mass of the anti-vibration hammer of the tuning fork type anti-vibration hammer of this structure remains basically unchanged; from the power characteristic test results, there are four resonance frequencies. The deviation of the first frequency, the second frequency and the third frequency is small, and the fourth frequency drops by 10.9%, which is closer to the center of the frequency range of the breeze vibration of the wire, which is more beneficial to vibration prevention. At the same time, the power at the first frequency and the second frequency of the conventional structure is higher, and the spectral peak is sharper, resulting in a peak-to-valley ratio exceeding the standard (greater than 5); the power at the first and second frequency of the structure has decreased, and the peak-to-valley ratio meets Requirements (less than 5), generally speaking, the anti-vibration performance of the anti-vibration hammer of this structure is more ideal. the

To sum up, the tuning fork type anti-vibration hammer with this structure has been greatly improved in anti-corona performance, and is suitable for use in 330kV transmission lines in areas with an altitude of 4000 meters and below, and its anti-vibration performance has also been improved to a certain extent. the

The invention has been described herein in terms of specific exemplary embodiments. Appropriate substitutions or modifications will be apparent to those skilled in the art without departing from the scope of the present invention. The exemplary embodiments are illustrative only, and not limiting of the scope of the invention, which is defined by the appended claims. the

Claims (6)

1. tuning-fork type stockbridge damper, described stockbridge damper comprise steel strand wire (3), press solidly wire clamp (4) on described steel strand wire (3), be fixed in the tup (1) at described steel strand wire (3) two ends, and described tup (1) is tuning fork structure, it is characterized in that:

Described tup (1) is provided with outboard end, intermediate connection structure and medial extremity successively along its central axial direction;

The outboard end of described tup (1) is the cylinder with hemispherical end face, and cylinder inside is provided with along its central axial direction and connects described cylindrical installing hole (5), described installing hole (5) and cylinder coaxial line;

The upper surface of the medial extremity of described tup (1) is the tuning-fork type structure, and lower surface is cylindrical surface structure;

The two ends of described tup (1) are smoothly connected by curved surface, and the inside of described intermediate connection structure has lightening hole (2).

2. a kind of tuning-fork type stockbridge damper as claimed in claim 1 is characterized in that described installing hole (5) and described lightening hole (2) are interconnected and coaxial line.

3. a kind of tuning-fork type stockbridge damper as claimed in claim 1, the preparation material that it is characterized in that described tup (1) is cast steel.

4. a kind of tuning-fork type stockbridge damper as claimed in claim 1 is characterized in that described steel strand wire (3) are fixed on the described tup (1) with the riveting method of colding pressing.

5. a kind of tuning-fork type stockbridge damper as claimed in claim 1 is characterized in that the diameter of described installing hole (5) is greater than the diameter 0.1-0.5mm of described steel strand wire (3).

6. a kind of tuning-fork type stockbridge damper as claimed in claim 1, the two ends that it is characterized in that described installing hole (5) be equipped with tapering greater than

Bellmouth.

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