JP3353997B2 - Suspension insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension insulator used for supporting a power transmission line on a steel tower.
The present invention relates to a suspension insulator including an insulator main body including a cylindrical portion and a top portion.

[0002]

2. Description of the Related Art In general, when a suspension insulator is used for a long period of time, cracks may be generated in a part of the suspension insulator due to aging, impact of lightning, or the like. For this reason, conventionally,
For all suspension insulators once every 5 to 10 years,
Workers inspected the deterioration of the insulator from a tower or the like with a defective insulator detector. However, such inspection work requires a great deal of time and labor.

[0003] As a technique for solving the above-mentioned problem, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 4-87113 is known. In this technique, a predetermined deterioration display liquid is stored in a cap portion of the insulator. This deteriorated display liquid has a certain degree of permeability and wet spreadability, and a colorant is mixed in the display liquid. When a crack occurs in the insulator, the deterioration display liquid contained in the cap portion oozes out to the surface of the cap portion through the crack and spreads over a wide area. As a result, at the time of inspection, the presence of the deterioration indicating liquid can be easily and reliably visually recognized, and the inspection work can be simplified.

[0004]

However, in the above technique, the deterioration display liquid is configured to be stored in a hollow portion inside the cap portion. For this reason, although the occurrence of cracks in the cap can be visually recognized,
Cracks generated in other places could not be confirmed.

[0005] In particular, the frequency of occurrence of cracks at the top located at the top of the insulator body is as high as that at the cap. Therefore, it is easy for cracks to occur in such parts,
In addition, reliable detection has been desired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a suspension insulator having an insulator body including a cap portion, a cylindrical portion, and a top portion. An object of the present invention is to provide a suspension insulator that can easily and surely detect a crack and that can reduce the time and labor required for inspection work.

[0007]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a cap portion having a lower fold,
An insulator main body comprising a cylindrical portion erected from the inner periphery of the cap portion and a top portion closing an upper surface of the cylindrical portion, and each of these portions is integrally formed of ceramic; and a center in the cylindrical portion. And a cap metal fixed via a first cement layer, and a cap metal fixed via a second cement layer so as to cover the cylindrical portion, wherein A first housing space is formed on the top surface of the top .
A first receiving recess, and inside the first receiving recess.
Contains the first reaction solution, and the second reaction solution is placed on the upper surface of the pin fitting.
Forming a second housing recess forming the housing space of
The second reaction liquid is stored in the second storage recess,
When the first and second reaction solutions are contacted and mixed with each other ,
The mixture that has undergone volume expansion due to a chemical reaction and has reacted
Has its gist that at least coloring have been made.

In a second aspect of the present invention, in the suspension insulator of the first aspect, the mixture after the reaction is a predetermined mixture.
The gist is that the resin cures after a lapse of time .

Further, in the third aspect, the first aspect is provided.
Alternatively, in the second invention, the cap fitting includes an outer surface of the cap fitting and an outer surface of the cap fitting to allow a mixture of the volume-expanded first and second reaction liquids to overflow from the outer surface of the cap fitting. The gist is that a communication hole communicating with the first accommodation space is provided.

[0010]

According to the configuration of the first aspect, when a crack occurs at the top made of ceramic, the crack can connect the first housing space and the second housing space. Then, the first and second reaction liquids accommodated in both spaces move up and down in the crack by capillary action, and contact and mix with each other. At this time, the two reaction solutions undergo a chemical reaction by contact mixing and expand in volume. Then, the mixture of the first and second reaction solutions overflows from at least the first storage space, and the outer surface of the suspension insulator, that is, the second cement layer between the tubular portion and the cap fitting, that is, , Caps, cap fittings, etc.
In addition, the mixture that has spread wet is at least colored after mixing.

[0011] Therefore, even if a crack occurs at the top, the presence of the colored mixture adhering to the outer surface of the suspension insulator allows the presence of the crack to be visually recognized .
Also, the first housing space is constituted by a housing recess formed on the upper surface of the top portion, the second housing space is formed by a housing recess formed on the upper surface of the pin fitting.
Therefore, it is not necessary to provide a separate housing space, and it is possible to suppress an increase in the size of the entire suspension insulator by separately providing the housing space. Due to the accommodation recess formed on the upper surface of the top, overflow of the mixture after volume expansion is easily allowed. According to the second invention, the first invention
In addition to the action of, even if left for a certain period of time, mixing
There is no danger of things being washed away by rainwater,
It is possible to keep showing crack occurrence for a long time
it can.

Further, according to the third invention, in addition to the function of the first or second invention, the cap fitting has a communication for communicating between the outer surface of the cap fitting and the first housing space. A hole is provided. For this reason, the mixture of the first and second reaction liquids whose volume has expanded can easily overflow from the outer surface of the cap fitting through the communication hole. Therefore, the mixture can spread over the outer surface of the suspension insulator without the intervention of the second cement layer.

[0013]

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the suspension insulator 1 includes an insulator main body 2, a pin fitting 3, a cap fitting 4, and the like. The insulator main body 2 includes a cap portion 5 having a fold 5a on a lower side, a tubular portion 6 erected from the inner periphery of the cap portion 5, and a top portion 7 for closing an upper surface of the tubular portion 6. The insulator main body 2 is formed by integrally forming these components with ceramic.

A pin fitting 3 is fixed to the center of the cylindrical portion 6 of the insulator main body 2 via a first cement layer 8. Further, a cap fitting 4 is fixed to the outer periphery of the tubular portion 6 via a second cement layer 9 so as to cover the tubular portion 6. In the upper part of the cap fitting 4, an engaging recess 11 for connecting the lower part of the pin fitting of the other suspension insulator (the part shown by a two-dot chain line in the figure) and the suspension insulator 1 is formed. By engaging this engagement recess 11 with the lower part of the pin fitting of another suspension insulator, a plurality of suspension insulators can be sequentially connected in the vertical direction.

In this embodiment, as shown in FIG. 2, a first accommodating recess 12 constituting a first accommodating space is formed on the upper surface of the top portion 7. The inside of the accommodation recess 12 is filled with a first reaction liquid 13. On the other hand, a second housing recess 14 forming a second housing space is formed on the upper surface of the pin fitting 3. The inside of the accommodation recess 14 is filled with the second reaction liquid 15.

The first reaction liquid 13 contains, for example, an epoxy resin as a main component. In addition, the second reaction solution 15
For example, a urea resin is a main component, and a pigment is appropriately mixed in the reaction solution 15. In the present embodiment, when the first and second reaction liquids 13 and 15 are mixed with each other in contact with each other, a chemical reaction occurs between them and a slight volume expansion occurs. Further, the mixture M of both after the reaction is:
The pigment is colored by the pigment. further,
One of the first and second reaction liquids 13 and 15 includes:
A predetermined amount of a catalyst for initiating and promoting the reaction is mixed. At the same time, the mixture M of the two after the reaction is cured at room temperature after a predetermined time has elapsed.

Further, the upper surfaces of the two housing recesses 12 and 14 are covered with a film (not shown). The coating of the film prevents the first reaction liquids 13 and 15 from spilling during the manufacture of the suspension insulator 1. still,
A cushion member 16 made of an annular cork is provided on the upper surface of the pin fitting 3 so as to surround the second accommodation recess 14.
Is attached.

Next, the operation and effect of this embodiment will be described. When using the above suspension insulator 1, deterioration over time,
It is assumed that a crack 20 occurs on the top 7 as shown in FIG. 3 due to a lightning strike or the like. Then, the film covering the first and second housing recesses 12 and 14 is broken by the generation of the cracks 20. Therefore, the first housing recess 12 and the second housing recess 14 are communicated by the crack 20.

Then, as shown in FIG.
The first and second reaction solutions 13 and 1 accommodated in the
5 move downward and upward in the crack 20 by capillary action, and mutually contact and mix. At this time, the two reaction liquids 13 and 15 undergo a chemical reaction by contact mixing and expand in volume. Then, the first and second
The mixture M of the reaction liquids 13 and 15 overflows from at least the first storage recess 12. And as shown in FIG.
The mixture M penetrates and passes through the second cement layer 9 located between the cylindrical portion 6 and the cap fitting 4, and spreads on the outer surface of the suspension insulator 1, that is, the outer surface of the cap portion 5. In addition, the mixture M that has spread wet has been colored at least after mixing due to the presence of the pigment.

Therefore, even if a crack 20 occurs on the top 7, the presence of the colored mixture M attached to the outer surface of the suspension insulator 1 allows the presence of the crack 20 to be visually recognized. As a result, at least the crack 20 generated on the top 7 can be easily and reliably detected, and the time and labor required for the inspection work can be reduced.

The mixture M hardens after a predetermined time has elapsed. Therefore, even if the mixture M is left for a certain period of time, there is no possibility that the mixture M is washed away by rainwater or the like. Therefore, the occurrence of the crack 20 can be continuously displayed for a long time.

Further, in this embodiment, the first housing recess 1
2 is formed on the upper surface of the top 7, and the second accommodation recess 14 is
It is formed on the upper surface of the pin fitting 3. For this reason, it is not necessary to provide a separate accommodation space in the suspension insulator 1, and by separately providing the accommodation space, it is possible to suppress an increase in the size of the entire suspension insulator 1, thereby achieving space saving. be able to. In addition, the presence of the first housing recess 12 formed on the upper surface of the top 7 allows the mixture M to easily overflow after volume expansion. Therefore, the reliability of the display of the occurrence of the crack 20 can be further increased.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. However, in the present embodiment, the parts already described in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted, and different points will be mainly described.

As shown in FIG. 6, in this embodiment, the cap fitting 4 has an outer surface (the engaging recess 1).
The first embodiment is different from the first embodiment in that a communication hole 21 that communicates between the first housing recess 12 and the first housing recess 12 is provided. The opening of the communication hole 21 on the side of the cap fitting 4 is covered with a film (not shown) in order to prevent rainwater or the like from entering the inside of the suspension insulator 1.

According to this embodiment, in addition to the functions and effects described in the first embodiment, the following functions and effects are provided. That is, as shown in FIG. 7, when a crack 20 occurs at the top 7, the crack 20 connects the first housing recess 12 and the second housing recess 14 similarly to the first embodiment. Then, the first and second reaction liquids 13 and 15 contact and mix with each other, and expand in volume. Then, the mixture M of the first and second reaction liquids 13 and 15 overflows from at least the first storage recess 12. Then, the mixture M rises in the communication hole 21.

At this time, the film at the opening of the communication hole 21 on the side of the cap fitting 4 is broken by the impact force that caused the crack 20 or the pressing force due to the volume expansion of the mixture M. Then, as shown in FIG. 8, the mixture M overflows from the engaging recess 11 of the cap fitting 4 and spreads on the outer surface of the suspension insulator 1, that is, the outer surface of the cap fitting 4.

For this reason, also in this embodiment, the first
As in the embodiment, the mixture M adhered to the outer surface of the suspension insulator 1
The presence of the crack 20 makes it possible to visually recognize the presence of the crack 20 and easily and reliably detect it. As a result, the time and labor required for the inspection work can be reduced.

Further, in this embodiment, the mixture M is made to spread on the outer surface of the cap fitting 4 through the communication hole 21. Therefore, even when the mixture M has a high viscosity and does not easily pass through the second cement layer 9, the mixture M can be reliably adhered to the outer surface of the suspension insulator 1.

The present invention can be implemented as follows, with a part of the configuration being appropriately changed. (1) In the second embodiment, the communication hole 21 is configured to substantially linearly communicate between the outer surface of the cap fitting 4 and the first housing recess 12 as shown in FIG. As described above, the communication hole 22 that opens to the side of the engagement recess 11 may be formed in a curved shape. In addition, a communication hole may be formed so as to open directly to the outer surface of the side of the cap fitting 4 instead of the side of the engagement recess 11. With this configuration, it is possible to prevent rainwater or the like from entering the inside of the suspension insulator 1 without covering the opening on the cap fitting 4 side with a film.

(2) In each of the above embodiments, only the cracks 20 generated at the top 7 of the insulator main body 2 can be detected. However, each of these configurations may be combined with the configuration shown in the prior art. That is, as shown in FIG. 10, for example, in addition to the configuration described in the first embodiment,
The hollow portions 31 and 32 may be formed in an annular shape inside, and the hollow portions 31 and 32 may be filled with the deterioration display liquid 33. With this configuration, the top 7
In addition, a crack generated in the cap portion 5 can be detected.

(3) In the above embodiment, the first reaction solution 13
Is mainly composed of epoxy resin, and the second reaction liquid 15 is
Although urea resin was the main component, these reaction solutions 13,
The components 15 are not limited to the above components as long as they are volume-expanded by a chemical reaction when they are contact-mixed with each other, and are colored at least after mixing. Examples of the combination include, for example, an epoxy resin and a polyisocyanate as main components, an acrylic resin and an amino resin as main components, and an acrylic resin and an epoxy resin as main components. And those containing a polyisocyanate compound and a polyol compound as main components, respectively.

Further, a fluorescent paint mainly composed of a vehicle (dummar rubber, vinyl acetate resin, acrylic resin, alkyd resin, etc.) may be mixed into at least one of the reaction liquids 13 and 15. With this configuration, the crack 20 can be easily and reliably detected even in a dark place.

(4) In the above-described embodiment, the two recesses 12,
Although the upper surface of 14 is covered with a film, the film may be omitted from covering. (5) In the above embodiment, an annular cushion material 16 is formed on the upper surface of the pin fitting 3 so as to surround the second accommodation recess 14.
Is provided, but the cushion material 16 may be omitted.

(6) In the above embodiment, the first housing recess 12 is formed by forming a recess on the upper surface of the top portion 7, and the second housing recess 14 is formed by forming a recess on the upper surface of the pin fitting 3. Are formed, but a configuration in which a separate accommodation space is provided may be adopted.

The technical ideas which are not described in each claim of the claims but can be grasped from the above embodiment are described below together with their effects. (A) In the suspension insulator according to claim 3, one end of the communication hole is formed in a curved shape or a bent shape so as to open to a side portion of the cap fitting. With this configuration, it is possible to prevent rainwater or the like from entering the inside of the suspension insulator without covering the opening on the cap fitting side with a film or the like.

[0036]

[0037]

As described above in detail, according to the first to third aspects of the present invention, in the case of a suspension insulator including an insulator body including a cap portion, a cylindrical portion, and a top portion, cracks generated at least at the top portion Can be easily and reliably detected, reducing the time and labor required for inspection work, and increasing the size of the entire suspension insulator
This has an excellent effect that it can be suppressed from being performed .

According to the second aspect of the present invention, the mixture is
There is no danger of being washed away by rainwater etc.
Can keep showing the occurrence of cracks over time
You. Furthermore, according to the third aspect, even if the viscosity of the mixture of the first and second reaction solutions is high, cracks can be easily and reliably detected.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing a suspension insulator according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the suspension insulator in the first embodiment.

FIG. 3 is an enlarged sectional view showing a state in which a crack has occurred at the top of the insulator main body in the first embodiment.

FIG. 4 is an enlarged cross-sectional view showing an operation when a crack occurs at a top in the first embodiment.

FIG. 5 is a partially cutaway side view of the suspension insulator showing an operation when a crack occurs at the top in the first embodiment.

FIG. 6 is an enlarged sectional view showing a main part of a suspension insulator according to a second embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view showing an operation when a crack occurs at a top in the second embodiment.

FIG. 8 is a side view of a suspension insulator showing an operation when a crack occurs at a top in the second embodiment.

FIG. 9 is an enlarged sectional view showing a main part of a suspension insulator according to another embodiment of the present invention.

FIG. 10 is a partially broken side view of a suspension insulator according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Suspension insulator, 2 ... Insulator main body, 3 ... Pin fitting, 4 ... Cap fitting, 5 ... Cap part, 5a ... Fold, 6 ... Cylindrical part, 7 ... Top part, 8 ... First cement layer, 9 ... No. 2 cement layers, 1
2... A first accommodation recess forming a first accommodation space, 13.
1st reaction liquid, 14 ... 2nd accommodating recessed part which comprises 2nd accommodation space, 15 ... 2nd reaction liquid, 21, 22, ... communication hole.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01B 17/00-17/54

Claims (3)

(57) [Claims] 1. A cap portion having a fold on a lower side, a tubular portion erected from the inner periphery of the cap portion, and a top portion closing an upper surface of the tubular portion, and these portions are integrally formed of ceramic. An insulator main body formed; a pin fitting fixed to the center of the tubular portion via a first cement layer; and a pin fitting fixed to the tubular portion so as to cover the tubular portion via a second cement layer. A suspension including a cap fitting, wherein a first storage space defining a first storage space on an upper surface of the top portion is provided.
A recess is formed, and a first recess is formed in the first accommodation recess.
And a second accommodating space that forms a second accommodating space on the upper surface of the pin fitting.
A receiving recess is formed, and in the second receiving recess,
When the second reaction solution is contained and the first and second reaction solutions are mixed and contacted with each other, the volume is expanded by a chemical reaction and the mixing after the reaction is performed.
Gobutsu is characterized in that at least colored made <br/> suspension insulators. 2. The reaction mixture after a predetermined time has passed
2. The suspension insulator according to claim 1, wherein the suspension insulator is hardened . 3. The cap metal has an outer surface of the cap metal and the first surface of the first reaction liquid to allow the mixture of the first and second reaction solutions, which have undergone volume expansion, to overflow from the outer surface of the cap metal. The suspension insulator according to claim 1 or 2, further comprising a communication hole communicating with the housing space.