JP2791850B2 - Damper - Google Patents

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 a breeze vibration of an overhead transmission line.

[0002]

2. Description of the Related Art Conventionally, a double torsional damper (hereinafter, referred to as a DTD) has been widely used as a damper for suppressing a breeze vibration of an overhead transmission line. This DT
In brief, D will be described below by obliquely lowering the support portion of the overhead transmission line by the wire gripping portion (for example, about 30
), And a restraining line consisting of a steel stranded wire parallel to the overhead power transmission line is arranged at the free end of the supporting part. Weights are respectively connected to both ends of the restraining line so as to be opposite to each other. The reason why the support portion is disposed obliquely downward is to prevent the center of gravity of the entire damper from being directly below the overhead transmission line.

In such a configuration, two weights alternately perform a pendulum motion up and down with the deterrent line as a fulcrum, thereby twisting the deterrent line with respect to the high-frequency light wind vibration of the overhead transmission line. Due to the twisting of the inhibition wire, the vibration energy is converted into frictional energy between the strands of the inhibition wire itself or between the strands and is dissipated. In addition, since the damper is disposed so that the center of gravity comes obliquely downward with respect to the low-frequency vibration of the overhead transmission line, the two weights simultaneously perform a pendulum-like motion with the overhead transmission line as a fulcrum. And twist the overhead transmission line itself. Vibration energy is dissipated by the twist of the overhead power transmission line itself. Furthermore, the horizontal and vertical component force due to the inertia of the weight of the overhead transmission line as a fulcrum is added to the vertical movement of the overhead transmission line, causing the overhead transmission line to vibrate complicatedly and irregularly, reducing its amplitude, In addition, the Karman vortex street is disturbed, and the vibration of the overhead transmission line is suppressed.

[0004]

In the above-mentioned DTD, it is possible to efficiently suppress the breeze vibration of the overhead transmission line. However, in order to dissipate the vibration energy of the breeze vibration, the steel stranded wire of the restraining wire is repeatedly twisted. Therefore, in the case of DTDs installed on overhead transmission lines that are stretched over terrain where breezes are likely to occur, there is a concern that the steel strands of the restraining wires may be broken due to fatigue failure and the weight may fall. Is done.

The present invention has been made in view of the circumstances of the conventional damper as described above, and provides a damper that can efficiently dissipate the vibration energy of the breeze vibration of the overhead power transmission line and does not cause the weight to fall. The purpose is to provide.

[0006]

In order to achieve the above object, a damper according to the present invention is provided with a support arm provided at a support portion having an electric wire gripping portion at one end, and coaxial shafts at both ends of the support arm. Are provided, and the swing shafts are coaxially supported through elastic members in these outer peripheral frames, and the centers of gravity are opposite to each other with respect to a vertical plane including the axis. As described above, the swing shaft is provided with a weight.

[0007] The two swing shafts may be connected by a restraining line disposed on the shaft center.

Further, the swing shaft may be provided with an enlarged portion which cannot pass through the outer peripheral frame at an end opposite to the side where the weight is provided.

[0009]

In the damper according to the first aspect, two weights alternately oscillate up and down with the swing axis as a fulcrum in response to a high frequency of light wind vibration of the overhead transmission line. And the relative rotation of the swing shaft is absorbed by the elastic deformation of the elastic member, and the vibration energy is dissipated. Even if the elastic member is fatigued, the elastic member does not break like the restraining line of the conventional DTD.

Further, in the damper according to the second aspect, the restraining line connecting the two rocking shafts is twisted by the alternating vertical pendulum movement of the two weights, and the restraining wire also causes slight wind vibration. Vibration energy is dissipated.

Further, in the damper according to the third aspect of the present invention, since the swing shaft is provided with an enlarged portion which cannot pass through the outer peripheral frame, even if the elastic member may be separated from the outer peripheral frame and deviated, it may be enlarged. The portion prevents the weight from falling.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view in which a part of one embodiment of the damper of the present invention is cut away to form a vertical cross section, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG.
FIG. 4 is an enlarged cross-sectional view taken along arrow B, and FIG. 4 is a cross-sectional view taken along arrow CC in FIG.

In FIGS. 1 to 4, an electric wire gripper 12 is provided at one end of a supporter 10, and the supporter 10 is attached to the overhead transmission line 14 at an angle of .theta.
It is arranged obliquely downward. The other end of the support section 10 has a support arm 1 substantially parallel to the overhead power transmission line 14.
6 are projected in both directions, and have cylindrical outer peripheral frames 18, 18 having the same axis substantially parallel to the overhead transmission line 14 at both ends.
Is provided. Further, elastic members 20, 20 made of rubber, plastic, or the like are provided in the outer peripheral frames 18, 18.
The swing shafts 22, 22 are supported coaxially through the shaft.

Here, ridges 18a are provided on the inner peripheral surfaces of the outer peripheral frames 18, 18 in the circumferential direction, and convex portions 22 are provided on the outer peripheral surfaces of the oscillating shafts 22, 22 in the circumferential direction.
a, 22a... and recesses 22b, 22b. Further, the inner peripheral surfaces of the outer peripheral frames 18 and 18 and the swing shaft 2
Adhesives are respectively applied to the outer peripheral surfaces of the elastic members 20 and 20, and the elastic members 20, 20 are molded, and the outer peripheral frames 18, 18, the elastic members 20, 20, and the swing shafts 22, 22 are integrally molded and adhered. Therefore, the swing shafts 22, 22 can rotate relative to the outer peripheral frames 18, about the axis only within the allowable range of the elastic deformation of the elastic members 20, 20.

At the end on the side where the two swinging shafts 22 and 22 face each other, there are provided flange-like enlarged portions 24 and 24 which cannot pass through the outer peripheral frames 18 and 18 in external dimensions. The two rocking shafts 22, 22 are connected to both ends of a restraining wire 26 made of a twisted steel wire by appropriate caulking or the like. The weights 2 are attached to the other ends of the swing shafts 22, 22.
8 and 28 are respectively fixed by caulking or the like. These weights 28, 28 are disposed such that the centers of gravity are opposite to each other with respect to the axis within a horizontal plane including the axis.

The swing shafts 22, 22 are connected to the weights 28, 2
Before the 8 is fixed, the other ends of the expanded portions 24, 24 on the opposite side are penetrated into the outer peripheral frames 18, 18 and molded. Further, the weights 28, 28 need only have their centers of gravity on opposite sides to a vertical plane including the axis, and need not necessarily be in a horizontal plane including the axis. That is, the weights 28, 28 in FIG. 2 may form an eight-shape. Further, the free ends of the weights 28, 28 are
The shape may be bent in an L-shape so as to be parallel to. Further, the center of gravity of the entire damper of the present invention does not have to be directly below the overhead transmission line 14, and the support portion 10 does not necessarily have to be disposed obliquely downward.

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

In addition, against a breeze vibration having a high frequency,
The two weights 28, 28 alternately pendulum up and down to elastically deform the elastic members 20, 20, and twist the restraining lines 26, thereby dissipating vibration energy.

Here, in the damper of the present invention, the elastic energy of the elastic members 20, 20 is used to dissipate the vibration energy, so that the vibration energy is dissipated by one restraining line as in the conventional DTD. Excellent in durability compared to Further, even when the elastic members 20 and 20 are fatigued or lose their elasticity, the weights 28 and 28 do not drop unlike the breakage of the conventional DTD restraining line. Moreover, the huge part 2
The weights 28, 28 do not fall from the outer peripheral frames 18, 18 because the weights 28, 28 cannot pass through the outer peripheral frames 18, 18 because they are provided. Further, the two swing shafts 22, 22 are connected by the restraining line 26, and there is no danger of falling. If the elastic members 20, 20 are fatigued, the postures of the weights 28, 28 change so as to hang down, and can be visually recognized from the ground.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 5 is a front view in which a part of another embodiment of the damper according to the present invention is cut away to form a vertical section. 5, the same members as those in FIG. 1 are denoted by the same reference numerals, and duplicate description will be omitted.

The other embodiment shown in FIG. 5 is different from the embodiment shown in FIGS.
In other words, the suppression line 26 connecting the first and second parts 22 is omitted.
Even if the restraining line 26 is omitted, the vibration energy due to the breeze vibration of the weights 28, 28 can be sufficiently dissipated by the elastic members 20, 20 having appropriate volumes.

FIG. 6 is a table showing the span length S versus the energy allowance R, which was measured under the same conditions.
The measurement results are shown by a solid line for the conventional DTD, an embodiment of the damper of the present invention shown in FIGS. 1 to 4 by a dashed line, and another embodiment of the damper of the invention shown in FIG. 5 by a dotted line. . As is clear from FIG. 6, compared to the conventional DTD, the embodiment shown in FIGS. 1 to 4 has an excellent energy tolerance R at all span lengths, and is efficiently caused by the micro wind vibration of the overhead transmission line 14. It is shown that vibration energy can be dissipated. In the other embodiment shown in FIG.
A span length of less than m indicates that the dissipation of vibration energy is superior to that of the conventional DTD.

In the above embodiment, the support arm 16 is provided in a straight line. However, the present invention is not limited to this. The support arm 16 may have a shallow inverted V-shape or a gentle arc. Then, it is only necessary that the outer peripheral frames 18, 18 provided on the support arm 16 be provided so that the same axis is substantially parallel to the overhead transmission line 14. Further, the shape of the weight 28 is not limited to the above-described embodiment, but may be any shape such as providing a substantially rectangular parallelepiped at the tip of a rod-shaped body. Further, the elastic member 20 is not limited to the one integrally fixed to the outer peripheral frame 18 and the swing shaft 22 by molding, but may be any other suitable structure such as fitting or bonding so that the elastic member 20 cannot be relatively rotated. good.
Further, any structure may be used as long as the swing shaft 22 and the weight 28 cannot be relatively rotated.

[0024]

As described above, since the damper of the present invention is constituted, the following special effects can be obtained.

In the damper of the first aspect, the movement of the weight due to the breeze vibration of the overhead transmission line is absorbed by the elastic deformation of the elastic member, the vibration energy of the overhead transmission line is dissipated, and the vibration is suppressed. Can be Moreover, even if the elastic member undergoes fatigue failure or loses its elasticity, there is no disconnection such as the conventional restraining line, and there is no danger of the weight falling.

Further, in the damper according to the second aspect, since the vibration energy of the breeze vibration is dissipated by both the elastic member and the restraining wire, the breeze vibration of the overhead transmission line can be more effectively suppressed. In addition, the weight is prevented from falling by the restraining line.

Furthermore, in the damper according to the third aspect, the swing shaft cannot come out of the outer peripheral frame due to the enormous portion, and even if the elastic member is broken, the weight cannot fall and the safety is extremely high. high.

[Brief description of the drawings]

FIG. 1 is a front view of a damper according to an embodiment of the present invention, in which a part of the damper is cut away to form a vertical section.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is an enlarged cross-sectional view taken along the line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 3;

FIG. 5 is a front view in which a part of another embodiment of the damper of the present invention is cut away to form a vertical section.

FIG. 6 is a table showing a span length S versus an energy margin R obtained by actually measuring a conventional DTD and two examples of the present invention under the same conditions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Support part 12 Electric wire gripping part 14 Overhead transmission line 16 Support arm 18 Peripheral frame 20 Elastic member 22 Swing axis 24 Enlarged part 26 Suppression line 28 Weight

Continuation of the front page (56) References JP-A-50-65896 (JP, A) JP-A-53-68894 (JP, A) JP-A 50-48191 (JP, U) JP-A 52-97496 (JP) , U) Japanese Utility Model Showa 57-133226 (JP, U) Japanese Utility Model Showa 52-100196 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02G 7/00-7/22

Claims (4)

(57) [Claims] 1. A support arm is provided on a support portion having an electric wire gripping portion at one end portion, and cylindrical outer peripheral frames having the same axis are provided at both end portions of the support arm, respectively. A swing shaft is supported on a coaxial center via a member, and weights are provided on the swing shaft so that the centers of gravity are opposite to each other with respect to a vertical plane including the axis. And damper. 2. The damper according to claim 1, wherein the two swinging shafts are connected by a restraining line disposed on the axis. 3. The damper according to claim 1, wherein an enlarged portion that cannot pass through the outer peripheral frame is provided at an end of the swing shaft opposite to the side where the weight is provided. A damper characterized by the following. 4. The damper according to claim 1, wherein the wire support is fixed to the overhead transmission line such that the support is obliquely downwardly directed to the overhead transmission line, and the weight is a horizontal plane including the axis. A damper characterized by being arranged inside.