JPH1145625A - Electric wire cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve withstand voltage performance without lengthening leg parts by forming auxiliary wall parts to cover a part where an electric insulating material- made hollow cover main body divided in the circumferential direction and the electric insulating material-made leg parts extending outward in the radial direction from the vicinity of both end parts divided in its circumferential direction, continue with each other or a part more than that. SOLUTION: Auxiliary wall parts 17 and 18 to cover a part where respective leg parts 15 and 16 extending outward by continuing with circumferential directional both end parts 13 and 14 where an almost cylindrical cover main body 12 overlaps in the radial direction by being divided in the circumferential direction continues with the cover main body 12, are desirably formed in a streamline shape and an almost cylindrical shape having small air resistance. Divided tip parts 23 of loose end parts 22 continuing with base parts 21 of the auxiliary wall parts 17 and 18 have a prescribed interval between tip parts 24 of inserting guide parts 19 and 20 of the respective leg parts 15 and 16. It is better to interpose a space layer between the auxiliary wall parts 17 and 18, the cover main body 12 and the respective leg parts 15 and 16. Since the respective leg parts 15 and 16 can be shortened by improving withstand voltage performance, vibration of an electric wire by wind is reduced, and rupture by metal fatigue can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire cover and, more particularly, to an overhead distribution line in order to prevent a short circuit or a ground fault accident caused by contact of an overhead distribution line with an article having a different electric potential or a human body. The present invention relates to an electric wire cover attached to the electronic device.

[0002]

2. Description of the Related Art Overhead power distribution lines (hereinafter simply referred to as "wires") disposed near live sites and construction sites, and wires that may come into contact with nearby buildings due to wind. In order to prevent a short circuit or a ground fault accident caused by contacting the electric wire with an article or a human body having a different potential, an electric insulating wire cover is attached.

FIG. 11 is a cross-sectional view showing a state in which an electric wire cover 1 according to a typical prior art is attached to an electric wire 2.
The electric wire cover 1 has a substantially cylindrical shape, and has one portion divided in a circumferential direction, and a portion in the radial direction of the cover body 3 which is connected to the vicinity of both circumferential end portions 4a and 4b of the cover body 3. Each leg 5a, 5b extends outward in a straight line. This electric wire cover 1 is realized by a synthetic resin or the like having an electric insulating property.

[0004] Both ends 4a, 4b in the circumferential direction of the cover body 3
Are arranged so as to overlap each other in the radial direction of the cover body 3 in a natural state where no external force acts. Of these, a base end 6a of one leg 5a is connected to one end 4a in the circumferential direction arranged on the outside, and near the other end 4b in the circumferential direction,
The other leg 5b continues. The legs 5a and 5b are arranged adjacent to each other in the circumferential direction of the phase cover main body 3 in the natural state.

When the electric wire cover 1 is attached to the electric wire 2,
For example, a finger is inserted between the tips 7a and 7b of the legs 5a and 5b, and the legs 5a and 5b are connected to the both ends 4a in the circumferential direction.
a, 4b, while being displaced in the direction away from each other against the elastic recovery force of the cover body 3,
The electric wire 2 is guided from the sides a and 7b and passed between the legs 5a and 5b and between the both ends 4a and 4b in the circumferential direction to be housed in the internal space of the cover body 3.

As the electric wire cover 1 attached to the electric wire 2 in this manner, a cover having a withstand voltage performance greater than the voltage applied to the electric wire 2, that is, the working voltage is selected. More specifically, the wire cover 1 has a length L <b> 1 along the circumferential direction of the other circumferential end 4 b of the cover main body 3 and a leg 5.
creepage distance (L1 + L), which is the sum of the length L2 of a and 5b
The one having the leg portions 5a and 5b having an appropriate length L2 is selected so that 2) is equal to or greater than a predetermined distance required to prevent creeping discharge.

[0007]

In the prior art described above, a long leg 5 is required for an electric wire 2 having a large working voltage.
What is necessary is just to select the electric wire cover 1 which has a and 5b. However, if the leg portions 5a and 5b are long, the influence of the wind becomes large and the electric wire 2 is likely to vibrate, so that, for example, a joint portion of the electric wire 2 with the traction insulator may be broken due to metal fatigue. Therefore, it is not preferable to use the electric wire cover 1 having the long legs 5a and 5b.

[0008] An object of the present invention is to provide an electric wire cover in which the withstand voltage performance is improved without lengthening the legs.

[0009]

According to a first aspect of the present invention, there is provided a hollow cover body made of an electrically insulating material and divided in a circumferential direction, and both ends of the cover body made of an electrically insulating material in the circumferential direction. An electric wire cover comprising: a leg portion extending in the vicinity of a portion and extending outward in a radial direction of a cover main body; and an auxiliary wall portion covering at least a portion where the cover main body and each leg portion continue.

According to the present invention, a portion where the cover main body and each leg are connected is covered by the auxiliary wall portion. The present inventor has confirmed by testing that the withstand voltage performance is improved when the portion where the cover body and the leg portion are connected is covered with the auxiliary wall portion. Note that a space may be interposed between the cover body, each leg, and the auxiliary wall, or a configuration in which an object having electrical insulation properties is packed. As described above, according to the present invention, the withstand voltage performance can be improved without increasing the length of the legs as compared with the above-described conventional electric wire cover 1.

Since the withstand voltage performance can be improved by providing the auxiliary wall portion, the necessary withstand voltage performance can be provided by providing the auxiliary wall portion in the above-described conventional electric wire cover 1 and the leg can be provided. The portions 5a and 5b can be shortened. Thereby, the vibration of the electric wire due to the wind can be eliminated, and the breakage of the electric wire due to metal fatigue can be eliminated.

According to a second aspect of the present invention, in the configuration of the first aspect, the auxiliary wall portion has a streamline shape for guiding wind to a downstream side in the flow direction and reducing air resistance. Features.

According to the invention, the auxiliary wall has a streamlined shape. The streamline is a shape in which the air resistance is reduced, and the auxiliary wall guides the flow of the wind on the surface to the downstream side. In other words, the auxiliary wall portion is formed so as to pass from the upstream side to the downstream side without opposing the flow of the wind. Therefore, in the electric wire cover of the present invention, the streamlined auxiliary wall portion covers a portion where the cover body and each leg portion are bent and connected to each other. Thus, the breakage of the electric wire can be prevented.

According to a third aspect of the present invention, in the configuration of the first or second aspect, a space is interposed between the cover main body, the vicinity of the tip of each leg, and the auxiliary wall. I do.

According to the present invention, the auxiliary wall extends from the cover main body to the vicinity of the distal end of each leg, whereby a space is interposed between the auxiliary wall and the cover main body and each leg. Thereby, the withstand voltage performance of the electric wire cover can be improved without lengthening the legs. In addition, by forming the auxiliary wall portion in the streamline shape, a portion where the leg portion faces the outside and is exposed as much as possible can be reduced as much as possible, so that breakage of the electric wire due to wind can be eliminated.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the auxiliary wall portion is divided in a circumferential direction thereof.

According to the present invention, since the auxiliary wall portion is divided in the circumferential direction, the legs are separated from each other against the elastic recovery force of the cover body in the work of attaching to the electric wire. When guiding the electric wire between the legs, the legs can be easily separated from each other as compared with a configuration in which the auxiliary wall is not divided in the circumferential direction. Further, in a state where the wire cover is attached to the wire, the wire cover is easily deformed according to the slack of the wire, so that the wire cover can be reliably maintained.

According to a fifth aspect of the present invention, in the configuration of the first aspect of the invention, the auxiliary wall portion is provided with each leg extending from the vicinity of the circumferential center between both circumferential ends of the cover body. It extends over the vicinity of the distal end of the portion, and is formed in a substantially cylindrical shape.

According to the present invention, since the auxiliary wall is formed in a substantially cylindrical shape, it is possible to reduce air resistance against winds from all directions. In addition, since the auxiliary wall portion extends from the vicinity of the central portion in the circumferential direction of the cover main body to the distal end portion of each leg portion, the withstand voltage performance can be improved as much as possible and the size can be reduced.

According to a sixth aspect of the present invention, in the configuration of the first aspect of the invention, the auxiliary wall portion is
It is characterized in that it is detachably attached to at least one of the cover body and each leg from the outside.

According to the present invention, the auxiliary wall is configured to be attachable to at least one of the cover body and the leg. Therefore, by mounting the auxiliary wall portion on the wire cover having only the cover body and the leg portion as in the related art, the withstand voltage performance is improved, and breaking of the wire to which the wire cover is mounted is prevented. Can be.

[0022]

FIG. 1 is a sectional view showing an electric wire cover 11 according to an embodiment of the present invention. Wire cover 1
1 is a cover body 12 which is substantially cylindrical and is divided in the circumferential direction.
And legs 15, 16 extending radially outward of the cover main body 12 and extending to the circumferential ends 13, 14 of the cover main body 12, respectively, and a portion where the cover main body 12 and the legs 15, 16 continue. The auxiliary wall portions 17 and 18 are included. The cover body 12, the legs 15, 16 and the auxiliary walls 17, 18 are integrally formed of an electrically insulating synthetic resin such as polyethylene. The wire cover 11 is used to prevent a short circuit accident that occurs when a metal article comes into contact with the wire.

In the natural state in which no external force acts on the cover main body 12, the circumferential ends 13 and 14 are mutually stacked in the radial direction of the cover main body 12 in the longitudinal direction (the direction perpendicular to the paper surface in FIG. 1). Placed. One leg 15
Is connected to the circumferential one end 13 disposed outside,
The other leg 16 is formed so as to be continuous with the other end 14 in the circumferential direction arranged on the inside.

Insertion guides 19, 2 are provided at the distal ends of the legs 15, 16 opposite to the proximal ends connected to the cover body 12.
0 are respectively formed. The insertion guides 19 and 20 expand in the direction away from each other as they separate from the cover main body 12. Each of the insertion guide portions 19 and 20 is provided on the cover body 1.
The guide surface 30 extends at angles θ1 and θ2 with respect to one virtual plane 29 extending in a direction along the radial direction
Having. The angles θ1 and θ2 are each selected, for example, to 45 degrees. In the natural state, the intermediate portions of the legs 15, 16 from the base end to the insertion guide portions 19, 20 may be resiliently contacted with each other. May be adjacent to

The auxiliary walls 17 and 18 comprise a base 21 and a free end 22. The base 21 extends in a tangential direction of the cover main body 12, and the free end 22 is formed to be continuous with the base 21 and to curve outwardly in a direction approaching each other as the distance from the cover main body 12 increases. You. Free end 22
The distal end portion 23 that is most separated from the base portion 21 is attached to the distal end portions 24 of the insertion guide portions 19 and 20 by the auxiliary wall portion 1.
7 and 18 are separated at intervals L3 in the circumferential direction. L3 is selected to be, for example, 1 mm. A space 25 is defined by the auxiliary wall portions 17 and 18 thus formed, the legs 15 and 16 and the cover body 12. The thicknesses t1 and t2 of the cover body 12 and the legs 15 and 16 are:
Sufficient withstand voltage performance for the working voltage of the wire to be installed,
More specifically, a thickness having a sufficient volume insulation resistance is appropriately selected. The thickness t3 of each of the auxiliary wall portions 17 and 18
May be selected to be smaller than the thicknesses t1, t2 of the cover body 12 and the legs 15, 16 in order to reduce the weight of the wire cover 11.

When attaching the wire cover 11 to the wire,
With the guide surfaces 30 of the insertion guide portions 19 and 20 abutting against the outer surface of the electric wire, the center portion in the circumferential direction on the opposite side to the portion where the legs 15 and 16 of the cover main body 12 are connected is manually manipulated. Push in. Since each of the guide surfaces 30 is inclined at angles θ1 and θ2 with respect to the one virtual plane 29 so as to be away from each other, the legs 15 and 16 are slid in contact with the outer surface of the electric wire. The cover body 12 can be pushed open in a direction away from each other against the elastic recovery force. Further, the auxiliary wall portions 17 and 18 are provided so as to be separated from the respective leg portions 15 and 16 in the circumferential direction with the distance L3 therebetween, so that the auxiliary wall portions 17 and 18 are not separated in the circumferential direction. In comparison, the legs 17, 18 can be easily separated from each other. Also, the distal end portion 24 of the insertion guide portions 19, 20
Since it is formed round, it is possible to eliminate such a problem that the outer surface of the electric wire is damaged when pressed against the electric wire.

With the wires interposed between the legs 17 and 18 as described above, the wires are further pushed into the wire cover 11 so that the wires pass between the legs 15 and 16 and extend in the circumferential direction of the cover body 12. An internal space 3 defined by the inner surface 32 of the cover main body 12 through the space between both ends 13 and 14.
Guided to 3. When the electric wire is led to the internal space 33,
The circumferential ends 13 and 14 and the legs 15 and 16 of the cover main body 12 are displaced in directions approaching each other due to the elastic recovery force of the cover main body 12. This can eliminate the problem that the wire cover 11 falls off the wire.

In the state where the electric wire cover 11 is attached to the electric wire in this way, it is possible to eliminate a problem that an article or a human body having a different electric potential is directly corroded on the outer surface of the electric wire, thereby causing a short circuit or a ground fault. . In the configuration of the embodiment of the present invention, the auxiliary walls 17 and 18 are provided, and the space 25 is provided.
Is defined, the withstand voltage performance of the wire cover 11 can be improved as compared with the above-described configuration of the related art. The inventor of the present invention covered the surface exposed to the outside of the wire cover with aluminum foil, gradually increased the voltage applied to the wires, and measured the voltage at which a short circuit occurred. The wire cover is attached to the auxiliary wall 17,
It has been confirmed that the device has a withstand voltage performance that is about 1.5 times that of the configuration of the related art without 18. The withstand voltage performance is
It increases as the volume of the space 25 increases. In the embodiment of the present invention, since the auxiliary walls 17 and 18 are provided with the base 21 extending in the substantially same direction as the extending directions of the legs 15 and 16, the space 25 is compared with a configuration in which the base 21 is not provided. Can be enlarged.

In the embodiment of the present invention, the auxiliary wall 1
7 and 18 are formed so as to guide the wind to the downstream side in the flow direction. For example, the wind blowing in the direction indicated by arrow A1 is the wind guided in the direction passing above the wire cover 11 indicated by arrow A2, and the wind blowing on one side (left side in FIG. 1) indicated by arrow A3. Along the surface of the auxiliary wall portion 18, it is divided into wind guided in a direction passing below the wire cover 11. The wind in the direction of arrow A2 is guided along the substantially cylindrical upper surface of the cover body 12 in the direction indicated by arrow A4. The wind indicated by the arrow A3 passes through the lower part of the electric wire cover 11 and passes in the direction indicated by the arrow A5. At this time, the wind indicated by the arrow A5 is guided by the auxiliary wall portion 17 on the other side (the right side in FIG. 1) in the same direction as the arrow A1 so that the negative pressure due to the wake does not become excessively large. Therefore, the air resistance of the electric wire cover 11 can be reduced, thereby eliminating the problem that the electric wire vibrates and breaks.

In the case where rain falls in a state where the electric wire cover 11 is attached to the electric wire, rainwater is guided to the lower portion along the outer surfaces of the auxiliary walls 17 and 18. Since the distal end portions 23 of the auxiliary wall portions 17 and 18 and the distal end portions 24 of the insertion guide portions 19 and 20 are provided with an interval L3, rainwater is not guided to the insertion guide portions 19 and 20, but is caused by gravity. Fall down. As a result, compared with the configuration in which the interval L3 is not provided, rainwater passes between the legs 15 and 16 from the joint 28 by capillary action, and furthermore, the electric wire passes through between the circumferential ends 13 and 14. The disadvantage of being guided to the internal space 33 to be accommodated can be eliminated.

The cover body 12, the legs 15, 16 and the auxiliary walls 17, 18 each have a two-layer structure including an inner layer and an outer layer. The inner layer is colored, for example, yellow, and the outer layer is colored, for example, black. This makes it possible to easily determine from the outside whether or not the wire cover 11 has been worn to such an extent that sufficient withstand voltage performance cannot be obtained while the wire cover 11 is attached to the wire. Also, the wire cover 11
The outer surface of the wire can be improved in beauty by, for example, being colored green, and by alternately arranging red and white, a pilot of a paraglider or the like can easily identify the wire cover 11.

FIG. 2 is a side view of the electric wire cover 11.
FIG. 1 described above is a cross-sectional view as viewed from the section line II. A male end 38 and a female end 39 are provided at both ends in the longitudinal direction of the electric wire cover 11, respectively. The male end 38 and the female end 39 are formed of an electrically insulating synthetic resin such as polyethylene, and are integrally joined to the electric wire cover main body 37 by means such as welding. The male end body 38 and the female end body 39 have end body auxiliary walls 40 and 41 respectively connected to the auxiliary walls 17 and 18. The male end 38 is configured to be insertable into an inner hole of the female end 39. The wire cover 11 has a longitudinal length L4. The length L4 in the longitudinal direction is, for example, 3 m. In order to prevent a short circuit accident that occurs when a metal article comes into contact with an electric wire, it is necessary to attach the electric wire cover 11 in a row along the longitudinal direction of the electric wire. By inserting the male end body 38 provided at one end thereof into the female end body 39 of the adjacent electric wire cover 11, the electric wires can be easily connected in the longitudinal direction. In addition, since the electric wire cover 11 is disposed so that the auxiliary wall portions 17 and 18 are separated from the leg portions 15 and 16 in the circumferential direction of the electric wire cover 11,
More specifically, the tip portions 23 and 24 are spaced from each other by an interval L3.
The wire cover 11 can be provided with the same flexibility as the above-described wire cover 1 of the related art, and the wire cover 11 can be fitted to the slack of the wire. It is. Thereby, the state where the electric wire cover 11 is attached to the electric wire can be maintained for a long time.

FIG. 3 is a sectional view showing an electric wire cover 43 according to another embodiment of the present invention. Note that the wire cover 43
Is similar to the above-described embodiment, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.

The electric wire cover 43 has a configuration in which the auxiliary walls 17 and 18 and the insertion guides 19 and 20 of the legs 15 and 16 are connected to each other as compared with the above embodiment. In the present embodiment, since the space 25 defined by the auxiliary walls 17, 18 and the cover body 12 and the legs 15, 16 is defined separately from the outside, it is assumed that wind blowing in the direction of the arrow A1 is generated. Also, without the wind flowing into the space 25,
Since the wind can be guided to the downstream side in the flow direction, it is possible to more reliably prevent the wire from breaking due to vibration. In addition, since the electric wire cover 43 can be provided with rigidity in the longitudinal direction, it is possible to minimize the problem that the electric wire is undesirably sagged due to its own weight. At the lower end of each auxiliary wall 47, a plurality of drain holes are formed at intervals in the longitudinal direction (the direction perpendicular to the paper surface of FIG. 3). With this drain hole, for example, rainwater that has entered the space 25 from the openings on both sides in the longitudinal direction of the wire cover during rainfall can be discharged to the outside.
The drain holes are similarly formed in the electric wire covers 55a and 61 of other embodiments described later.

FIG. 4 is a sectional view showing an electric wire cover 46 according to still another embodiment of the present invention. The electric wire cover 46 is similar to each of the above-described embodiments, and the corresponding portions are denoted by the same reference numerals and description thereof will be omitted.

The auxiliary wall portion 47 of the electric wire cover 46 extends from near the center in the circumferential direction between the circumferential ends 13 and 14 of the cover main body 12 and extends over the distal end portions 24 of the legs 15 and 16 and has a substantially cylindrical shape. It is formed. Thus, the auxiliary wall portion 47
Is formed in a substantially cylindrical shape, the electric wire cover 46 can reduce the air resistance against winds from all directions. Therefore, the electric wire to which the electric wire cover 46 is attached has less vibration due to the wind, whereby the electric wire can be reliably prevented from breaking.

FIG. 5 is a sectional view showing an electric wire cover 48 according to still another embodiment of the present invention. The electric wire cover 48 is similar to each of the above-described embodiments, and the corresponding portions are denoted by the same reference numerals and description thereof will be omitted.

A hinge portion 49 is provided at the center of the electric wire cover 48 in the circumferential direction of the cover main body 12. Hinge part 49
Is a thickness t larger than the thickness t1 of the cover body 12.
4 and a notch 54, whereby the cover body 12 is configured to be openable and closable in directions indicated by arrows A6 and A7. Locking claws 50, 51 are provided near the portions of the legs 15, 16 connected to the cover main body 12, respectively. The engagement of the locking claws 50 and 51 with each other as shown by a solid line in FIG. 5 can prevent the cover main body 12 from being displaced in the directions of arrows A6 and A7.

With the electric wire cover 48 configured as described above, the work of attaching to the electric wire can be easily performed as compared with the above-described embodiments. This makes it possible to easily attach the electric wire to the electric wire using, for example, an electric wire cover mounting robot. Also, the tip portions 52, 5 of the legs 15, 16
3 has a configuration in which insertion guide portions 19 and 20 for easily inserting an electric wire are not provided, as compared with the above-described embodiments. Therefore, in a state in which the electric wire cover 49 is attached to the electric wire, it is possible to eliminate the problem that the wind flows into the insertion guide portions 19 and 20, the negative pressure due to the wake becomes excessive, and the electric wire vibrates.

FIG. 6 is a sectional view showing a wire cover 55 according to still another embodiment of the present invention. The electric wire cover 55 is similar to the above-described embodiment, and the corresponding portions are denoted by the same reference numerals and description thereof will be omitted.

In the electric wire cover 55 of this embodiment, each leg 56, 57 forms an angle θ4 with respect to the virtual plane 29 along the radial direction of the cover body 12 several times on one side (FIG. 6).
To the right) and the other side (the left in FIG. 6). The angle θ4 is set to, for example, 45 degrees.

In the electric wire cover 55 in which the legs 56 and 57 are bent as described above, the electric wire cover 1 described above is used.
A longer creepage distance can be ensured as compared with a configuration in which the leg portions such as 1, 43, 46, and 48 extend linearly in the radial direction of the cover main body 12. That is, the withstand voltage performance can be improved. In other words, the required withstand voltage performance can be provided, and the length L5 of the leg portions 56 and 57 along the radial direction can be shortened as compared with the above-described embodiments. That is, it is possible to reduce the size of the electric wire cover 55, thereby reducing the influence of the wind, suppressing vibration of the electric wire, and preventing breakage of the electric wire.

FIG. 7 is a sectional view showing a wire cover 55a according to still another embodiment of the present invention. The electric wire cover 55a of the present embodiment is different from the electric wire covers 46 and 5 described above.
5, the corresponding parts have the same reference characters with suffix a
And the description is omitted.

In the electric wire cover 55a of this embodiment, the legs 56a, 57a are provided to bend while meandering at right angles to the one virtual plane 27.

In the electric wire cover 55a of this embodiment, the legs 56a, 57a are defined by the auxiliary wall portions 17, 18 and the cover main body 12, as compared with the electric wire cover 55 of the above-described similar embodiment. Since it can be formed large by utilizing the space 25a, a large creepage distance can be secured, and thereby the withstand voltage performance can be improved. Further, since the length L6 of the cover body 12 along the radial direction can be shortened, the electric wire cover 55
a can be reduced in size. Further, each leg 56a, 5
7a shows that each leg 56
a, 57a can be brought into contact with each other by applying a fitting stress that fits each other,
The disadvantage that the legs 56a and 57a open undesirably and drop off the wire cover 1 can be eliminated.

FIG. 8 is a sectional view showing a wire cover 61 according to still another embodiment of the present invention. The electric wire cover 61 of the present embodiment is different from the electric wire cover 5 of the above-described embodiment.
5, 55a, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.

In the electric wire cover 61, expanded portions 64a and 64b are formed on the legs 62 and 63, respectively, so as to expand in directions away from each other at right angles to the virtual plane 29. A space 64c is defined by the expanded portions 64a and 64b.

In the electric wire cover 61 of this embodiment, since the space 64c is interposed between the legs 62, 63, for example, during rainfall, rainwater reaches the insertion guide portions 19, 20 along the surface of the electric wire cover 61. And even if it moves upward by capillary action, it is stored in the space 64c, and thereby it can be prevented from reaching the internal space 33 of the cover main body 12 in which the electric wire is accommodated.

Further, the electric wire cover 11 of the above-described embodiment,
The creepage distance can be increased as compared with the configuration of the legs 43, 46, and 48 extending linearly in the radial direction of the cover main body 12, whereby the withstand voltage performance can be improved.

FIG. 9 is a sectional view showing an electric wire cover 65 according to still another embodiment of the present invention. The electric wire cover 65 according to the embodiment of the present invention includes a hollow cover main body 12 divided in a circumferential direction, and circumferential end portions 13 of the cover main body 12.
A conventional wire cover portion 65a integrally formed with legs 15, 16 extending radially outward of the cover main body 12 in the vicinity of the cover body 12 is integrally formed with the auxiliary wall portion 6 having the streamline shape.
6, 67 are externally mounted.

Each of the auxiliary wall portions 66 and 67 is hollow, and is adhered to the cover body 12 and each of the leg portions 15 and 16 in a longitudinal direction by, for example, an adhesive.

As described above, in this embodiment, the auxiliary wall portion 6
By attaching 6,67 to the conventional wire cover, the withstand voltage performance is improved, and the effect of air resistance is reduced.
It is possible to prevent breakage of the electric wire. As described above, in the present embodiment, since only the auxiliary wall portions 66 and 67 are manufactured and used, the conventional electric wire cover can be used, so that an effect of being excellent in economy can be obtained.

FIG. 10 is a sectional view showing an electric wire cover 69 according to still another embodiment of the present invention. The electric wire cover 69 according to the present embodiment is similar to the above-described electric wire cover 65, and corresponding portions are denoted by the same reference numerals and description thereof is omitted.

In the electric wire cover 69, the auxiliary wall portion 70 having a substantially C-shaped cross section perpendicular to the axis is provided with the conventional electric wire cover portion 65.
a. The auxiliary wall portion 70 is formed in a substantially C-shape divided in the circumferential direction, and a length between both circumferential end portions 71 and 72 is formed smaller than a circumferential length of the cover main body 12. The auxiliary wall portion 70 is realized by, for example, polyethylene and has flexibility. The auxiliary wall 70 has an internal space that can cover at least the cover main body 12 from outside.

When the thus formed auxiliary wall portion 70 is mounted on the conventional electric wire cover portion 65a, the cover main body 12 is inserted into the internal space 73 from between the circumferential end portions 71 and 72.
Fit from the top so as to lead to. Auxiliary wall 7
0, the space 74 is interposed between the auxiliary wall portion 70 and the conventional electric wire cover portion 65a, so that the withstand voltage performance is improved, and the auxiliary wall portion 70 moves the wind on the downstream side in the flow direction. Since the air flow has a streamline shape for reducing air resistance, the influence of wind due to air resistance can be suppressed, and breakage of electric wires can be prevented. In addition, the auxiliary wall portion 6 of the above-described embodiment.
6 and 67, compared to the conventional wire cover 65 such as adhesive.
Since it is possible to omit the means for attaching to a
The mounting work of the auxiliary wall portion 70 can be easily performed.

In the electric wire cover according to each of the embodiments of the present invention described above, a rib extending in the circumferential direction of each electric wire cover and guiding the wind may be provided on the surface of the auxiliary wall portion, or the wind may be disturbed. A recess called dipping provided on the surface of the golf ball may be provided. By providing ribs or dipping on the surface of each auxiliary wall to guide the wind or disturb the flow of the wind, the resistance value of the wire cover to the air flow is further reduced, and breakage of the wire is prevented. It can be eliminated. Further, in each of the embodiments described above, since polyethylene is used, flame retardancy can be imparted in addition to electrical insulation. However, in the configuration of the present invention, it is not limited to polyethylene, and for example, polypropylene is used. You may.

In the structure of the present invention, since air exists in the cover main body 12 and the space interposed between each leg and the auxiliary wall, the withstand voltage performance is improved and the amount of material used is reduced. Thus, a lightweight and inexpensive wire cover can be realized. However, the configuration of the present invention is not limited to air, and may be a configuration in which a substance such as urethane foam having insulating properties is packed. Although an overhead distribution line was assumed as a target to which the wire cover of the present invention is attached, the present invention is not limited to this. The present invention may be applied to a bellows-shaped electric wire cover having flexibility.

[0058]

According to the first aspect of the present invention, the portion where the cover main body and each leg portion are continuous is covered by the auxiliary wall portion.
The withstand voltage performance can be improved without lengthening the legs.

Since the withstand voltage performance can be improved by providing the auxiliary wall portion, the necessary withstand voltage performance can be provided by providing the auxiliary wall portion to the above-described prior art wire cover 1 and the leg can be provided. The portions 5a and 5b can be shortened. Thereby, the vibration of the electric wire due to the wind can be eliminated, and the breakage of the electric wire due to metal fatigue can be eliminated.

According to the second aspect of the present invention, the auxiliary wall portion is formed so as to pass from the upstream side to the downstream side without opposing the flow of the wind, and the cover body and the legs are bent. Because it covers the continuous part, compared to the above-mentioned conventional technology,
The vibration of the electric wire due to the wind is eliminated, thereby preventing the electric wire from breaking.

According to the third aspect of the present invention, the auxiliary wall portion extends from the cover main body to the vicinity of the tip of each leg portion, whereby a space is provided between the auxiliary wall portion and the cover main body and each leg portion. , The withstand voltage performance of the wire cover can be improved without lengthening the legs.
In addition, by forming the auxiliary wall portion in the streamline shape, a portion where the leg portion faces the outside and is exposed as much as possible can be reduced as much as possible, so that the wire breakage due to wind can be eliminated.

According to the fourth aspect of the present invention, since the auxiliary wall portion is divided in the circumferential direction, in the work of attaching the auxiliary wall portion to the electric wire, each leg portion is opposed to the elastic recovery force of the cover body. When the electric wire is opened between the legs and guided between the legs, the legs can be easily separated from each other as compared with a configuration in which the auxiliary wall is not divided in the circumferential direction. Further, in a state where the wire cover is attached to the wire, the wire cover is easily deformed according to the slack of the wire, so that the wire cover can be reliably maintained.

According to the fifth aspect of the present invention, since the auxiliary wall portion is formed in a substantially cylindrical shape, it is possible to reduce air resistance against winds from all directions. In addition, since the auxiliary wall portion extends from the vicinity of the central portion in the circumferential direction of the cover main body to the distal end portion of each leg portion, the withstand voltage performance can be improved as much as possible and the size can be reduced.

According to the sixth aspect of the present invention, since the auxiliary wall is configured to be attachable to at least one of the cover main body and the leg, only the cover main body and the leg similar to the prior art are provided. By attaching the auxiliary wall portion to the electric wire cover, it is possible to improve the withstand voltage performance and to prevent breakage of the electric wire to which the electric wire cover is attached.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electric wire cover 11 according to an embodiment of the present invention.

FIG. 2 is a left side view of the electric wire cover 11.

FIG. 3 is an electric wire cover 43 according to another embodiment of the present invention.
FIG.

FIG. 4 is a sectional view showing a wire cover 46 according to still another embodiment of the present invention.

FIG. 5 is a sectional view showing a wire cover 48 according to still another embodiment of the present invention.

FIG. 6 is a sectional view showing an electric wire cover 55 according to still another embodiment of the present invention.

FIG. 7 is a sectional view showing a wire cover 55a according to still another embodiment of the present invention.

FIG. 8 is a sectional view showing a wire cover 61 according to still another embodiment of the present invention.

FIG. 9 is a sectional view showing an electric wire cover 65 according to still another embodiment of the present invention.

FIG. 10 is a sectional view showing an electric wire cover 69 according to still another embodiment of the present invention.

FIG. 11 is a sectional view showing a typical conventional electric wire cover 1.

[Explanation of symbols]

11, 43, 46, 48, 55, 55a, 61, 65,
69 Wire cover 12 Cover body 13, 14 Both ends in the circumferential direction 15, 16, 56, 57, 56a, 57a, 62, 63
Each leg part 17, 18, 47, 66, 67, 70 Auxiliary wall part 24 Tip part 25, 74 Space

Claims (6)

[Claims] 1. A hollow cover body made of an electrically insulating material and divided in a circumferential direction, and a hollow cover body made of an electrically insulating material and connected to both ends in the circumferential direction of the cover body and radially outward of the cover body. An electric wire cover comprising: an extending leg portion; and an auxiliary wall portion that covers at least a portion where the cover body and each leg portion continue. 2. The electric wire cover according to claim 1, wherein the auxiliary wall portion has a streamline shape for guiding wind to a downstream side in the flow direction and reducing air resistance. 3. The electric wire cover according to claim 1, wherein a space is interposed between the cover main body, the vicinity of the tip of each leg, and the auxiliary wall. 4. The electric wire cover according to claim 1, wherein the auxiliary wall portion is divided in a circumferential direction thereof. 5. The auxiliary wall portion extends from near the center in the circumferential direction between both ends in the circumferential direction of the cover main body to near the tip portions of the legs, and is formed in a substantially cylindrical shape. Item 5. The electric wire cover according to any one of Items 1 to 4. 6. The electric wire cover according to claim 1, wherein the auxiliary wall portion is detachably attached to at least one of the cover body and each of the leg portions from outside. .