JPH06351139A - Damper - Google Patents

Abstract

PURPOSE:To provide a damper capable of eliminating the danger of falling off of weight 22 and efficiently dissipating vibration energy due to breeze vibration. CONSTITUTION:Within a case 10 supported by a wire holding portion 12 on an overhead power transmission line 14, one end of each coupling rod 16 is inserted to the case 10 from each side in parallel to the overhead power transmission line 14, and an inserting portion of these coupling rods 16, 16 is supported by elastic members 20, 20 molded within the case 10. At the other ends of the coupling rods 16, 16, weights 22, 22 are respectively provided in such a manner that the centers of gravity are mutually located oppositely within a horizontal plane containing the centers of gravity of the coupling rods 16, 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper for suppressing the breeze vibration of an overhead power transmission line.

[0002]

2. Description of the Related Art Conventionally, a double torsional damper (hereinafter referred to as DTD) has been widely used as a damper for suppressing a breeze vibration of an overhead power transmission line. This DT
To briefly explain D, the support portion is obliquely downwardly attached to the overhead power transmission line by the wire gripping portion (for example, about 30 degrees vertically).
) And a restraining line made of steel stranded wire parallel to the overhead power transmission line is arranged at the free end of this supporting part, and the center of gravity is against this inhibiting line in the horizontal plane including this inhibiting line. Weights are connected to both ends of the inhibition line so that they are on opposite sides. In addition, the reason why the support portion is disposed obliquely downward is to prevent the center of gravity of the entire damper from being located directly below the overhead power transmission line.

In such a structure, the two weights alternately perform a pendulum motion vertically with respect to the high frequency breeze vibration of the overhead power transmission line with the restraint line as a fulcrum to twist the restraint line. Due to the twisting of the restraining wire, the vibration energy is converted into the frictional energy of the restraining wire itself or the friction energy between the strands to be dissipated. Further, since the damper is disposed so that the center of gravity is located obliquely downward with respect to the low-frequency breeze vibration of the overhead power transmission line, the two weights simultaneously perform a pendulum-like motion with the overhead power transmission line as a fulcrum. Conduct and twist the overhead transmission line itself. The twist of the overhead power transmission line itself dissipates the vibration energy. Furthermore, lateral force components due to the inertia of the motion of the weight with the overhead transmission line as a fulcrum add to the vertical movement of the overhead transmission line, causing the overhead transmission line to vibrate in a complicated and irregular manner, reducing its amplitude, It also disturbs the Karman vortex streets and suppresses the vibration of overhead power lines.

[0004]

In the DTD described above, the vibration of the overhead power transmission line can be efficiently suppressed. However, in order to dissipate the vibration energy of the breeze vibration, the steel twisted wire of the restraining wire is repeatedly twisted. Therefore,
In a DTD provided on an overhead transmission line that is stretched over a terrain that is prone to breeze vibration, there is a concern that the steel twisted wire of the restraint wire may break due to fatigue failure and the weight may drop. .

The present invention has been made in view of the circumstances of the conventional damper as described above, and a damper capable of efficiently dissipating the vibration energy of the breeze vibration of the overhead power transmission line and having no fear of the weight dropping. The purpose is to provide.

[0006]

In order to achieve the above object, the damper of the present invention is a case in which an overhead power transmission line is supported by an electric wire gripping portion and openings are provided at both ends in the direction of the overhead power transmission line. One end of the connecting rod is inserted into each of the openings from both sides, and the insertion portions of these connecting rods are supported by the case via elastic members, and the free end portion of the connecting rod has a shaft of the connecting rod. Weights are provided so that the centers of gravity are opposite to each other with respect to the vertical plane including the center.

A second case for inserting the free end portion of the connecting rod into the weight is provided, and the free end portion of the connecting rod inserted into the second case is inserted into the second case via the second elastic member. It may be configured to be supported by two cases.

It is also possible to provide an enlarged portion at the portion where the connecting rod is inserted into the case, and to provide a compression portion at the opening of the case through which the enlarged portion cannot pass.

Further, a second enlarged portion is provided in the insertion portion of the connecting rod into the second case, and a constricted portion that cannot pass through the enlarged portion is provided in the opening of the second case on the insertion side of the connecting rod. It can also be provided and configured.

[0010]

[Operation] In the damper according to claim 1, the two weights alternately move upward and downward with the connecting rod as a fulcrum, in response to a high frequency breeze vibration of the overhead power transmission line. Relative rotation between the connecting rod and the case, which rotates with the movement, is absorbed by the elastic deformation of the elastic member, and the vibration energy is dissipated. And, even if the elastic member is fatigued, the conventional DT
It does not break like the deterrent line of D.

Further, in the damper according to the second aspect, since the weight is supported by the connecting rod through the second elastic member, the vibrations of the two weights are also absorbed by the second elastic member, and the vibration is large. It can dissipate vibrational energy.

In the damper according to the third or fourth aspect of the present invention, the connecting rod does not come off from the case by the enlarged portion, or the connecting rod does not come off from the second case by the second enlarged portion, so that it is elastic. The weight does not drop even if the member or the second elastic member is fatigue-fractured.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view in which a part of an embodiment of the damper of the present invention is cut away, and FIG.
FIG. 3 is a view on arrow, and FIG. 3 is a view on arrow B in FIG. 1.

In FIGS. 1 to 3, the case 10 is arranged diagonally below (for example, 30 degrees) with respect to the overhead power transmission line 14 by the wire grip portion 12. This case 10
Is a cylindrical shape having an axis substantially parallel to the overhead power transmission line 14, is divided into two by a wall 10a orthogonal to the axis at the central portion, and has a narrowing portion 10b having small openings at both ends in the axial direction, 10b is provided. And the pinching unit 10b,
The overhead transmission line 14 is penetrated into the case 10 through the opening of 10b.
The connecting rods 16 and 16 are inserted from both sides substantially in parallel with, respectively, and disk-shaped enlarging portions 18 and 18 having an outer diameter that cannot pass through the squeezing portions 10b and 10b are provided at the ends on the insertion side. Further, the elastic members 20, 20 made of rubber or plastic are molded in the case 10 to support the connecting rods 16, 16 in the case 10. At the time of molding, the inner surface of the case 10 and the enlarged portion 18,
By appropriately applying an adhesive to the outer surface of 18, the elastic members 20 and 20 are configured to be adhesively fixed to the case 10 and the enlarged portions 18 and 18 so as not to rotate relative to each other after molding. Therefore, the connecting rod 1 is attached to the case 10.
6 and 16 are capable of relative rotation about the axis only within the allowable range of elastic deformation of the elastic members 20 and 20. The weights 22 and 22 are fixed to the other ends of the connecting rods 16 and 16 by caulking or the like. These weights 22,22
Are arranged so that the centers of gravity are opposite to each other in the horizontal plane including the axes of the connecting rods 16 and 16.

It should be noted that the weights 22 and 22 only need to have their centers of gravity on opposite sides to a vertical plane including the axis, as shown in FIG.
In, the weights 22 and 22 may form a figure eight. Further, as long as the weights 22 and 22 are fixed to the connecting rods 16 and 16 so as not to rotate about their axes, they may be fixed in any structure.

In such a configuration, since the center of gravity of the damper of the present invention is not directly under the overhead power transmission line 14 with respect to the low frequency vibration of the overhead power transmission line 14, the conventional DTD.
In the same manner as above, the overhead power transmission line 14 acts to twist itself,
Vibration energy is dissipated.

Also, for a high frequency breeze vibration, 2
The two weights 22, 22 alternately move up and down to elastically deform the elastic members 20, 20 to dissipate the vibration energy.

Here, in the damper of the present invention, since the elastic deformation of the elastic members 20, 20 is used to dissipate the vibration energy, the vibration energy is dissipated by one restraint line as in the conventional DTD. It has superior durability compared to. Further, even if the elastic members 20 and 20 are fatigue-damaged or lose elasticity, the weights 22 and 22 do not drop unlike the breakage of the conventional DTD inhibition line. Moreover, since the enlarged portions 18, 18 provided at the tips of the connecting rods 16, 16 cannot pass through the narrowed portions 10b, 10b of the case 10, the weights 22, 22 do not separate from the case 10 and fall. There is no danger. If fatigue failure occurs in the elastic members 20, 20, the weights 22, 2
Since the posture of No. 2 changes so as to hang down, this can be visually recognized from the ground. Further, since the inside of the case 10 is partitioned into two by the wall 10a, the elastic members 20 and 20 supporting the connecting rods 16 and 16 are separate bodies, and the vibrations of the weights 22 and 22 are mutually separated. Vibration energy can be dissipated independently without transmission.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 is a front view in which a part of another embodiment of the damper of the present invention is cut away, FIG. 5 is a view taken in the direction of arrow C in FIG. 4, and FIG. 6 is a view taken in the direction of arrow D in FIG. Is.
4 to 6, members that are the same as or equivalent to those in FIGS. 1 to 3 are denoted by the same reference numerals and redundant description will be omitted.

The other embodiment shown in FIGS. 4 to 6 is different from the embodiment shown in FIGS. 1 to 3 in the following points. First, the connecting rods 16 and 16 and the weight 2
When connecting 2, 22, connecting rod 1 to weights 22, 22
Cylindrical second case 2 into which the free ends of 6, 16 can be inserted
4, 24 are provided. And these second case 2
The second pinching portions 24a, 24a are provided at the insertion side end portions of the connecting rods 16, 16 of 4, 4, and the free ends of the connecting rods 16, 16 cannot pass through the second pinching portions 24a, 24a. Plate-shaped second expanded portions 26, 26 are provided. further,
An adhesive is applied to the inner surface of the second case 24, 24, the insertion portion of the connecting rod 16, 16 and one surface of the second expanded portion 26, 26, respectively, and the second elastic members 28, 28 are molded to form the connecting rod. Weights 2, 2 are attached to the free ends of the 16, 16,
Two are supported. The free ends of the weights 22 and 22 are formed by bending in an L shape so that a part thereof is parallel to the overhead power transmission line 14 in a horizontal plane including the axis of the connecting rods 16 and 16.

In such a structure, in dissipating the vibration energy of the breeze vibration, the action of twisting the overhead power transmission line 14 and the elasticity of the elastic members 20, 20 are performed in the same manner as in the embodiment shown in FIGS. In addition to the effect of deformation, the weight 22,
The pendulum motion of 22 is absorbed by the elastic deformation of the second elastic members 28, 28, and the vibration energy is also dissipated by the second elastic members 28, 28.

The second expanded portions 26, 26 provided on the connecting rods 16, 16 are connected to the second case 24 of the weights 22, 22.
The second squeezing portions 24a, 24a provided on the unit 24 cannot pass through, and the weights 22, 22 do not separate and fall.

FIG. 7 is a table showing the span length S vs. energy tolerance R, which is measured under the same conditions.
The measurement result is shown by a solid line in the conventional DTD, and by a dotted line an embodiment of the damper of the present invention shown in FIGS. 1 to 3.
Another embodiment of the damper of the present invention shown in FIGS. 4 to 6 is shown by a chain line. As is clear from FIG. 7, the conventional DT
Compared to D, any of the examples has an excellent energy tolerance R in all span lengths, and it is shown that the vibration energy due to the breeze vibration of the overhead power transmission line 14 is efficiently dissipated.

In the above embodiment, the case 10
It suffices that the axis of is approximately parallel to the overhead power transmission line 14. And the connecting rod 1 whose one end is inserted into the case
The axes of the shafts 6 and 16 do not have to be in a straight line and may be substantially parallel to the overhead power transmission line 14. Further, the shape of the weight 22 is not limited to the above-mentioned embodiment, and an appropriate shape such as a prismatic shape may be adopted. Further, the case 10, the enlarged portion 18, the connecting rod 16, the second case 24, and the second enlarged portion 26 are not limited to those having a circular cross section or a disc shape, and may have a rectangular cross section or a square plate shape such as a square or a hexagon. May be. Further, the elastic member 20 and the second elastic member 28 are not limited to those integrally molded with the case 10 and the second case 24 by molding, and may be formed with an appropriate structure such as fitting or bonding.

[0025]

As described above, since the damper of the present invention is constructed, the following special effects are exhibited.

In the damper according to the first aspect of the present invention, the movement of the weight against the breeze vibration of the overhead power transmission line is absorbed by the elastic deformation of the elastic member, the vibration energy of the overhead power transmission line is dissipated, and the vibration is suppressed. To be Moreover, even if the elastic member undergoes fatigue fracture or loses elasticity, there is no disconnection such as the conventional restraint line, and there is no danger of the weight dropping.

Further, in the damper according to the second aspect, the vibration energy of the breeze vibration is applied to the second member in addition to the elastic member.
Since it is also dissipated by the elastic member, the breeze vibration of the overhead power transmission line can be suppressed more effectively.

In the damper according to the third or fourth aspect, the connecting rod does not come off from the case due to the enlarged portion, or the connecting rod does not come off from the second case due to the second enlarged portion, so that the elasticity is maintained. Even if the member or the second elastic member is fatigue-fractured, the weight cannot fall and the safety is extremely high.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a damper of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view on arrow B of FIG.

FIG. 4 is a partially cutaway front view of another embodiment of the damper of the present invention.

5 is a view on arrow C of FIG. 4. FIG.

FIG. 6 is a view on arrow D of FIG.

FIG. 7 is a table showing span length S vs. energy tolerance R measured under the same conditions as the conventional DTD and two examples of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 10b Squeezing part 12 Electric wire gripping part 14 Overhead power transmission line 16 Connecting rod 18 Enlarged part 20 Elastic member 22 Weight 24 Second case 24a Second constricting part 26 Second expanded part 28 Second elastic member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsunori Hamada 1812 Yamada, Imaizumi, Nagai City, Yamagata Prefecture Asahi Electric Co., Ltd. Nagai Research Institute

Claims (5)

[Claims] 1. A case in which one end of a connecting rod is inserted from both sides of the opening into a case supported by an overhead power transmission line by a wire gripping portion and provided with openings at both ends in the direction of the overhead power transmission line, respectively. The insertion portions of these connecting rods are supported by the case via elastic members, and the free ends of the connecting rods are placed so that their center of gravity is opposite to a vertical plane including the axis of the connecting rods. A damper characterized by being provided with weights respectively. 2. The damper according to claim 1, wherein the weight is provided with a second case into which a free end portion of the connecting rod is inserted, and the free end portion of the connecting rod inserted into the second case is provided with a second case. 2. A damper configured to be supported by the second case via an elastic member. 3. The damper according to claim 1, wherein an enlarged portion is provided at a portion where the connecting rod is inserted into the case, and a squeezing portion that cannot pass through the enlarged portion is provided at the opening of the case. A damper characterized by that. 4. The damper according to claim 2, wherein a second swelling portion is provided in an insertion portion of the connecting rod into the second case, and the swelling portion is provided in an opening of the second case on the insertion side of the connecting rod. A damper characterized by being provided with a squeezing section that cannot pass through the section. 5. The damper according to claim 1, wherein the case is supported and fixed obliquely downward by the wire gripping portion with respect to the overhead power transmission line, and the weight is a horizontal plane including an axis of the connecting rod. A damper characterized by being arranged inside.