JP3751845B2 - Polymer insulator seal structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheath and a gripping metal fitting in a polymer insulator made up of a core member, a jacket made up of a trunk and a cap provided on the outer periphery of the core member, and a gripping metal fitting provided at both ends of the core member. The present invention relates to a seal structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a polymer insulator including a core member, a jacket made up of a trunk and a cap provided on the outer periphery of the core member, and gripping metal fittings provided at both ends of the core member. Also, in this polymer insulator, various seal structures are known as the seal structure between the outer cover and the holding metal fitting.
[0003]
FIG. 4 is a view showing an example of a conventional polymer insulator sealing structure. In FIG. 4, a polymer insulator 51 includes an FRP core 52 as a core member, a jacket 55 formed of a body 53 and a cap 54 provided on the outer periphery of the FRP core 52, and grips provided at both ends of the FRP core 52. It is comprised from the metal fitting 56. FIG. 4 shows only one end. The holding metal fitting 56 includes a small-diameter portion 61 for holding the FRP core 52 and a large-diameter portion 62 that is continuous with the small-diameter portion 61 and has an open end 63. The distal end portion 71 of the trunk portion 53 is provided between the large diameter portion 62 and the FRP core 52. Between the inner peripheral surface 62a of the large diameter portion 62 and the outer peripheral surface 71a of the tip portion 71, a room temperature curable (RTV) silicone sealant 72 is provided as a sealant.
[0004]
And in the edge part which the inner peripheral surface 62a of the large diameter part 62 and the outer peripheral surface 71a of the front-end | tip part 71 adhere | attach, the protrusion part 72a which the room temperature hardening type silicone sealant agent 72 which exists between both protrudes exists, The surface of the protruding portion 72a is processed into a curved surface. Further, in order to improve the sealing performance between the inner peripheral surface 62a of the large-diameter portion 62 and the outer peripheral surface 71a of the distal end portion 71 of the trunk portion 53, 2 protrudes from the outer peripheral surface 71a to the distal end portion 71 of the trunk portion 53. Ring portions 73-1 and 73-2 are provided.
[0005]
[Problems to be solved by the invention]
As described above, the joint between the outer sheath 55 of the polymer insulator 51 and the gripping metal piece 56 is very important in preventing rainwater intrusion leading to deterioration of the FRP core 52, and therefore needs to be sealed. Reliability is required. The conventional seal structure described above is a structure in which the sealant 72 is exposed to the open end 63 at the protruding portion 72a. Therefore, the sealant 72 is exposed to the natural environment.
[0006]
In recent years, the improvement of the sealant agent 72 has progressed, and although a high-performance sealant agent 72 that sufficiently satisfies the specifications for polymer insulators has been adopted, it does not necessarily reach the same level as the performance of the outer cover 55. Is the current situation. Therefore, in order to further improve the reliability, a seal structure that is less affected by the performance of the sealant 72 even in a severe natural environment has been desired. In the above-described conventional seal structure in which the sealant agent 72 has the protruding portion 72a, when the protruding portion 72a of the sealant agent 72 is increased to secure the seal length and improve the water-resistant performance, the sealant agent is exposed. Since the area becomes large, the deterioration due to rainwater and ultraviolet rays is large, and the erosion resistance is also deteriorated. On the other hand, if the protrusion 72a of the sealant 72 is made small to improve the deterioration and erosion resistance, the reliability of the seal cannot be ensured.
[0007]
An object of the present invention is to solve the above-described problems and to provide a seal structure for a polymer insulator that can achieve improvement in water resistance and prevention of erosion of a jacket.
[0008]
[Means for Solving the Problems]
The seal structure of the polymer insulator according to the present invention includes an outer sheath in a polymer insulator comprising a core member, a jacket made up of a trunk and a cap provided on the outer periphery of the core member, and gripping fittings provided at both ends of the core member. The structure of the seal between the cover and the gripping bracket, wherein the front end of the barrel is provided between the gripping bracket and the core member, and between the inner peripheral surface of the gripping bracket and the outer peripheral surface of the tip of the barrel. In the seal structure of the polymer insulator provided with a sealant, a small rib is provided to protrude from the body of the outer cover, and the side of the small rib is configured to be in close contact with the opening end of the gripping metal via the sealant. The sealant agent is configured not to protrude from between the side surface of the rib and the opening end portion of the gripping metal fitting.
[0009]
In the present invention, the small rib is brought into close contact with the opening end portion of the gripping metal via the sealant agent, and the protrusion of the sealant agent is eliminated from between the small rib and the opening end portion. The sealant agent can be less affected, the adhesion life of the sealant agent can be secured, the water resistance can be improved, the occurrence of erosion of the protruding portion of the sealant agent as a trigger can be eliminated, and the erosion of the jacket can be prevented.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a diagram showing a configuration of an example of a polymer insulator as an object of the present invention. FIG. 2 is a view showing an example of the seal structure of the present invention in the polymer insulator shown in FIG. In the example shown in FIG. 2, the seal structure at one end is shown, but it goes without saying that the seal structure at the other end (not shown) may be the same. The polymer insulator seal structure of the present invention will be described with reference to FIGS. 1 and 2. First, the polymer insulator 1 includes an FRP core 2 as a core member, a body portion 3 provided on the outer periphery of the FRP core 2, and It is comprised from the jacket 5 which consists of the shade 4 and the holding metal fitting 6 provided in the both ends of the FRP core 2. As shown in FIG.
[0011]
The holding metal fitting 6 includes a small-diameter portion 11 for holding the FRP core 2 and a large-diameter portion 12 that is continuous with the small-diameter portion 11 and has an open end portion 13. The distal end portion 21 of the body portion 3 is provided between the large diameter portion 12 and the FRP core 2. Between the inner peripheral surface 12a of the large diameter portion 12 and the outer peripheral surface 21a of the distal end portion 21, a room temperature curable silicone sealant agent 22 is provided as a sealant agent. Moreover, in order to improve the sealing performance between the inner peripheral surface 12a of the large-diameter portion 12 and the outer peripheral surface 21a of the tip portion 21, two ring portions projecting from the outer peripheral surface 21a to the tip portion 21 of the trunk portion 3 23-1 and 23-2 are provided. The above configuration is the same as the conventional configuration, the structure of the FRP that constitutes the FRP core 2, the material such as silicon rubber that constitutes the jacket 5, the type of metal material that constitutes the gripping fitting 6, and the room temperature curable silicone sealant The composition and the like of the agent 22 are the same as the conventionally known structure and the like of the polymer insulator.
[0012]
The feature of the present invention is that a small rib 31 is provided so as to protrude from the body portion 3 of the outer jacket 5, and preferably the height H1 of the small rib 31 is lower than the height H2 of the opening end 13 of the gripping fitting 6. The side surface of 31 is configured to be in close contact with the opening end portion 13 of the large-diameter portion 12 via a room temperature curable silicone sealant agent 22 as a sealant agent, and the side surface of the small rib 31 and the opening of the large-diameter portion 12 The sealant 22 is configured not to protrude from between the end portions 13. Here, the configuration so that the sealant 22 does not protrude from between the side surface of the small rib 31 and the open end 13 of the large-diameter portion 12 is to eliminate the protruding portion 72a in the example described in the conventional example. As shown in FIG. 2, the presence of the sealant 22 at a position facing the atmosphere is acceptable between the two. The thickness of the sealant agent 22 provided between the side surface of the small rib 31 and the open end 13 of the large-diameter portion 12 at the open end, that is, the position facing the atmosphere is preferably 3 mm or less. Here, the thickness is preferably 3 mm or less because it is effective for reducing the sealant part exposed to the atmosphere and reducing electrical and thermal stresses that cause erosion. . In this respect, the thickness is more preferably 1 mm or less.
[0013]
In the present invention, it is small that the sealing performance equal to or higher than that of the conventional one can be obtained even without the sealant protruding portion 72a which has been considered to be necessary for securing the sealing performance. The rib 31 is provided, and the sealant agent 22 is also provided between the small rib 31 and the opening end portion 13, and the sealant agent 22 of this portion is formed between the inner peripheral surface 12 a of the large diameter portion 12 and the tip end portion 21. This is because the sealant 22 is formed continuously with the sealant 22 between the outer peripheral surface 21a and the direction substantially 90 °.
[0014]
In the present invention, by adopting the configuration described above, first, since there is no protruding portion 72a of the sealant agent in the conventional example, it is possible to eliminate the influence of rain water, ultraviolet rays, etc. on the protruding portion 72a. The influence of rain water, ultraviolet rays, etc. on the sealant agent 22 existing between 31 and the large diameter portion 12 can be reduced. Further, as compared with the conventional example, the portion contributing to the adhesion between the jacket 5 and the gripping metal fitting 6 can be increased by the amount of the sealant 22 existing between the small rib 31 and the opening end portion 13. As a result, the adhesion life of the sealant agent 22 can be ensured, and the water resistance performance in the seal structure of the polymer insulator of the present invention can be improved. Next, since there is no protruding portion 72a of the sealant agent in the conventional example, the occurrence of erosion of the protruding portion 72a that triggers erosion of the outer cover 5 is eliminated. As a result, the occurrence of erosion of the outer jacket 5 can be prevented,
[0015]
The seal structure of the polymer insulator of the present invention having the above-described configuration can be obtained by a method similar to the conventional method. That is, each of the FRP core 2 and the holding metal fitting 6 having a predetermined shape is prepared, and the outer shell 5 having a predetermined shape is formed around the FRP core 2 by using, for example, a mold. By setting the both ends of the FRP core 2 between the large diameter portion 12 and the tip portion 21 via the room temperature curable silicone sealant 22, and compressing and crimping the holding metal fitting 6 with a die, A polymer insulator seal structure can be obtained. At this time, the sealant 22 may protrude from between the small rib 31 and the open end 13 during caulking with a die. In this case, the sealant agent 22 may be wiped off before curing.
[0016]
FIG. 3 is a view showing another example of the seal structure of the present invention in the polymer insulator shown in FIG. In the example shown in FIG. 3, the same members as those in the example shown in FIG. The example shown in FIG. 3 is different from the example shown in FIG. 2 in that the opening of the small rib 31 of the jacket 3 at the bent portion between the inner peripheral surface 12a of the large diameter portion 12 and the outer peripheral surface 21a of the tip portion 21. The reservoir 41 is formed by cutting out the base portion on the side in contact with the end portion 13. The reservoir 41 acts to press the tip 31a of the small rib 31 against the open end 13 of the large diameter portion 12, and acts to store the sealant agent 22. Therefore, in this example, compared with the example shown in FIG. 2, it is possible to more suitably prevent rainwater from entering from the joint portion, and to obtain a seal structure with improved water-proof performance.
[0017]
In the above-described embodiment, the small rib 31 is provided separately from the shade 4, but by providing the shade 4 at the position of the small rib 31, the role of the small rib 31 can be achieved without providing the small rib 31. It can also be given to the base part of 4.
[0018]
【The invention's effect】
As is apparent from the above description, according to the present invention, the small rib is brought into close contact with the opening end portion of the gripping metal via the sealant agent, and the sealant agent is prevented from protruding from between the small rib and the opening end portion. By configuring as described above, the influence on the sealant agent such as rain water and ultraviolet rays can be reduced, the adhesion life of the sealant agent can be secured, the water-proof performance can be improved, and the occurrence of erosion of the protruding portion of the sealant agent that triggers is eliminated. The erosion of the jacket can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an example of a polymer insulator that is an object of the present invention.
FIG. 2 is a view showing an example of the seal structure of the present invention in the polymer insulator shown in FIG. 1;
FIG. 3 is a view showing another example of the seal structure of the present invention in the polymer insulator shown in FIG. 1;
FIG. 4 is a view showing an example of a conventional polymer insulator seal structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polymer insulator, 2 FRP core, 3 trunk | drum, 4 caps, 5 jacket, 6 grip metal fittings, 11 small diameter part, 12 large diameter part, 12a inner peripheral surface, 13 opening edge part, 21 front-end | tip part, 21a outer peripheral surface, 22 Room temperature curable silicone sealant, 23-1, 23-2 Ring, 31 Small rib, 31a Tip, 41 Reservoir

Claims (7)

This is a sealing structure between a jacket and a gripping metal fitting in a polymer insulator comprising a core member, a jacket made up of a trunk and a cap provided on the outer periphery of the core member, and a gripping metal fitting provided at both ends of the core member. In addition, a seal structure of a polymer insulator in which the front end portion of the body portion is provided between the gripping metal fitting and the core member, and a sealant agent is provided between the inner peripheral surface of the gripping metal fitting and the outer peripheral surface of the front end portion of the body portion. In
A small rib is provided so as to protrude from the body of the jacket, and the side surface of the small rib is configured to be in close contact with the opening end of the gripping metal via a sealant, and the side surface of the small rib and the opening end of the gripping metal are A polymer insulator sealing structure characterized in that the sealant agent does not protrude from between. The polymer insulator seal structure according to claim 1, wherein the height of the small ribs is lower than the opening end of the holding fitting. The seal structure for a polymer insulator according to claim 1, wherein the thickness of the open end portion of the sealant provided between the side surface of the small rib and the open end portion of the holding metal fitting is 3 mm or less, preferably 1 mm or less. 2. The polymer insulator according to claim 1, wherein a ring portion projecting from the outer peripheral surface is provided at the front end portion of the body portion in order to enhance a sealing performance between the inner peripheral surface of the gripping metal and the outer peripheral surface of the front end portion of the body portion. Seal structure. 2. The polymer insulator sealing structure according to claim 1, wherein a reservoir is provided at a root portion of the small rib on the side in contact with the opening end. 2. The polymer insulator sealing structure according to claim 1, wherein the sealant is a room temperature curable (RTV) silicone sealant. The polymer insulator seal structure according to claim 1, wherein the core member is an FRP rod.

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