JPH0350502A - Insulator fitting structure of electric feedthrough - Google Patents

Abstract

PURPOSE:To preclude creeping discharge sufficiently and to obtain the safer and more secure structure by providing concentric and circular cylindrical projections to a hollow discoid member and a cap-shaped member. CONSTITUTION:The cap-shaped member 1 which is adhered to the exposed part 67a on the tip side where the electric feedthrough 67 projects is provided with inside and outside cylindrical projection parts 4 and 5 which project concen trically with a center axis and in parallel to the ring-shaped part. The hollow discoid member 11 which is mounted on the polyethylene coating part 67b on the root side of the part where the electric feedthrough 67 projects is provided with inside and outside cylindrical projection parts 14 and 15 which project concentrically from the ring-shaped part 12 to the other side in parallel. Namely, when both are combined, the cylindrical projection parts 4 and 5, and 14 and 15 are arranged zigzag alternately in the section. Consequently, the creeping distance of the electric feedthrough from the tip-side exposed part to a housing lid can securely be extended and the generation of the creeping discharge can be suppressed.

Description

[Detailed Description of the Invention] [Summary] An object of the present invention is to provide an insulated mounting structure for a power feedthrough that can more safely and reliably prevent creeping discharge from an exposed portion of the power feedthrough. A power feedthrough consisting of a conductive cylindrical body whose outer surface is generally coated with an insulating resin, which is installed through a housing lid that partitions the inside of an optical submarine repeater. The part that sometimes protrudes from the housing lid consists of a base-side covering part covered with insulating resin and a tip-side exposed part from which the insulating resin has been removed, and this part is fitted into the base-side covering part. In the insulating mounting structure of the power supply feedthrough, a hollow disc-shaped member made of insulating resin is attached and has a central hole that allows the power supply The base-side covering part of the feedsle and the hollow disc-shaped member are fused and joined over the entire circumference at their fitting part, and the central axes of the hollow disc-shaped member and the cap-shaped member are aligned so that their substantially coincident central axes are joined. At least one concentric cylindrical protrusion is provided to protrude from each of the housings, so that the creepage distance from the tip-side exposed portion of the power feeding feedthrough to the housing lid can be substantially expanded.

[Industrial application field]

The present invention relates to an insulating mounting structure for a power supply feedthrough, which is installed through a housing lid that partitions the inside of an optical submarine repeater, and is mounted from a conductive cylindrical body whose outer surface is generally coated with an insulating resin.

[Conventional technology]

Referring to FIG. 6, which schematically shows the internal structure of the optical submarine repeater, 6l is a repeater pressure-resistant casing that protects the inside from high water pressure in the deep sea, 62 is a repeater unit, and repeater unit 6
2 is a housing lid 6 to isolate the internal electrical circuit from moisture.
3 keeps it airtight. A joint chamber cover 64 is further provided on the outside of the housing M63. 65.
Reference numerals 66 denote an optical cable and a power supply line for optical communication, respectively, and a so-called power supply feedthrough 67 is provided through the housing lid 63 to optically and electrically connect the repeater unit 62 to the outside.

Referring now to FIGS. 7 and 8, which are enlarged views of the main parts of the mounting structure of the power supply feedsle 67, the power supply feedsle 67 includes a conductive cylindrical body 68 and an insulating polyethylene coating that covers the outer surface of the conductive cylindrical body 68. Furthermore, a mounting bracket 7l is attached to the center portion of the outer cover, which engages with the O-ring 70 at an internal slope to ensure airtightness when inserted into the through hole of the housing 163. (Figure 8). The power supply feedthrough 67 is connected to the housing 1 from the inside.
63 and is pressed and fixed to the outside by tightening a nut 73 via a backup ring 72. Exposed portion 67 where the polyethylene coating on the tip side of the portion protruding from the housing 163 of the power feed feed sle 67 has been removed.
A power supply line 74 is screwed onto a from the side so that electricity can be supplied from the external power supply line 74 to the internal power supply line 75 (or vice versa).

In addition, a housing M63 is located inside the center of the power supply feedthrough 67.
A so-called optical feedthrough 77 holding an optical fiber 76 for optically connecting the inside and outside of the is inserted, and is pressed inward by tightening a backup bolt 78 to be hermetically fixed. 79 and 80 are polyethylene tubes for accommodating optical fibers on the outside and inside, respectively, with the housing 163 as a boundary.

[Problem to be solved by the invention]

As mentioned above, the power supply feedsle 67 is insulatedly attached to the housing lid 63, that is, the power supply feedsle 67 is
Although the cylindrical body 68 serving as a substantial current-carrying medium in No. 7 is fixed to the housing 163 in an insulated state without electrical contact,
A portion 67a of the cylindrical body 68 on the protruding end side of the power supply feedthrough 67 is exposed by removing the polyethylene coating for connection of the power supply line 74. Therefore, from this exposed portion 67a through the surface of the polyethylene covering portion 67b on the base side, the mounting bracket 7l of the power feeding feedsle 67 and the housing lid 6 are connected.
3, so-called creeping discharge is likely to occur, and in order to prevent this, a cap-like member 81 made of polyethylene is attached to the exposed end portion 67a, and a cap-like member 81 made of polyethylene is attached to the base-side covering portion 67b. A hollow disc-shaped member 82 made of polyethylene and provided with holes is attached.

However, considering the increase in supply voltage due to the recent increase in transmission capacity, this creeping discharge prevention measure is insufficient.
It is necessary to take safer and more reliable measures.

[Means to solve the problem]

In order to solve the above problems, according to the present invention, a power supply consisting of a conductive cylindrical body whose outer surface is generally coated with insulating citrus resin, which is installed through a housing lid that partitions the inside of a light-drain bottom repeater. The part of the feed through that protrudes from the housing lid when the power supply feed through is inserted is made up of a base part covered with insulating resin and an exposed part from which the insulating resin is removed at the tip. A hollow disc-shaped member made of an insulating resin and having a central hole into which the base-side covering part is fitted is attached to the base-side covering part, and a cap-like member made of an insulating resin is attached to the exposed tip-side part. In the insulating mounting structure of the power supply feedsle, the base side covering part of the power supply feedsle and the hollow disc-shaped member are fused and bonded over the entire circumference at their fitting part, and the hollow disc-shaped member and the camp-shaped member At least one concentric cylindrical protrusion is provided on each of the members to protrude with respect to their substantially coinciding central axes, thereby substantially increasing the creepage distance from the exposed portion on the tip side of the power supply feedthrough to the housing lid. The feature of the structure is that it is made possible to do so.

[For production]

The root-side covering part of the power feed feedthrough and the hollow disc-shaped member are fused and joined over the entire circumference at their fitting part, and the disc-shaped member and the cap-shaped member are joined to each other along their substantially coincident central axes. At least one concentric annular protrusion protrudes from each of the protrusions. As a result, the creeping distance from the exposed end portion of the power feeding feedthrough to the housing lid is substantially increased, making creeping discharge less likely to occur.

〔Example〕

Hereinafter, the present invention will be explained based on the illustrated embodiments. Parts that are the same as those in the conventional structure shown in FIGS. 7 and 8 will be given the same reference numerals, common explanations will be omitted, and only characteristic parts will be explained in detail. shall be.

Fig. 1 is a vertical cross-sectional view of an embodiment of the insulating mounting structure for the power supply feedthrough according to the present invention, Fig. 2 is a perspective view of a cap-shaped member that covers the main part of the structure, and Fig. 3 is the same cap-shaped member. Similarly, FIG. 4 is a perspective view of a hollow disc-shaped member forming a main part of this structure, and FIG. 5 is a longitudinal sectional view of the same hollow disc-shaped member.

Referring to FIGS. 2 and 3, the cap-shaped member l attached to the exposed portion 67a on the protruding tip side of the power feeding feed sle 67 is attached to the cap portion 2 and the circumferential edge portion of the opening side of the cap portion 2. a ring-shaped part 3 shaped like a shape, inner and outer cylindrical protrusions 4 and 5 that project parallel to each other from the ring-shaped part 31 concentrically with respect to the central axis of the cap-shaped member l; The outer cylindrical projection 5 has a flange 6 for attaching a cap-shaped member l shaped like a canopy like the ring-shaped part 3. The center of the bottom (upper part in the figure) of the cap part 2 is formed with a through hole 7 through which a polyethylene chub 79 for accommodating an optical fiber passes, and the flange part 6 has a plurality of mounting holes 8 for mounting the cap-like member 1. Individuality is dominated. In addition, since the power feed line 74 is screwed onto the exposed tip end portion 67a of the power feed feed sle 67 from the side, in order to avoid this, the cap-like member 1 has a predetermined cutout 9 for the power feed line 74 to escape. is formed.

On the other hand, the hollow disk-shaped member l1 attached to the polyethylene covering portion 67b on the base side of the protruding portion of the power feed feed sle 67 is made of polyethylene having insulating properties like the cap-shaped member 1 described above. Referring to FIGS. 4 and 5, the hollow disc-shaped member 1l includes a ring-shaped part 12 that constitutes a flange surface for attaching the hollow disc-shaped member 1l, and a hollow disc-shaped member 11 that projects from the ring-shaped part l2 to one side. In addition to the cylindrical protruding part l3 that enters into the housing lid 63 when it is installed, a cylindrical protruding part l3 that protrudes from the annular part 12 to the other side concentrically with respect to the central axis of the hollow disc-shaped member 11 in parallel with each other. It has inner and outer cylindrical protrusions l4 and 15. The inner surfaces of the cylindrical protrusion 13 and the inner cylindrical protrusion 14 have a common central hole l.
Be wary of 6. Further, a hollow disc-shaped member 1 is provided in the ring-shaped portion 12.
Referring to FIG. 1, which shows the power supply feedthrough mounting structure in which the cap-like member 1 and the hollow disk-like member 11 described above are actually mounted, a plurality of mounting holes l7 are formed for mounting. The hollow disc-shaped member 11 is attached to the base-side covering part 67b of the power supply feed sle 67 that protrudes from the unit 63 to the outside of the unit through its central hole l6, and the disc-shaped member 1l is fitted into the ring-shaped part l2. It is fixed to the housing lid 63 through the mounting hole 17 with screws. Further, the hollow disk-shaped member 11 is connected to the base side covering portion 67 of the power feed feed sle 67.
b, the inner cylindrical protrusion 14 of the hollow disc-shaped member 11
At the outer end side where the cover part 67b and the cover part 67b engage, they are fused and joined over the entire circumference of the engagement part.

A cap-shaped member 1 is attached to the exposed end portion 67a of the power feed feed sle 67, and the cap-shaped member 1 is attached to the housing lid together with the disc-shaped member 1 through a mounting hole 8 formed in the flange portion 6 of the cap-shaped member 1. 63 with screws.

As can be clearly understood from the cross section of FIG. 1, between the parallelly opposing annular portions 12 and 3 of the hollow disk-like member 11 and the cap-like member l attached in this way, the cylinders of both are separated. The protrusions 4, 5, 14, 15 are arranged alternately in a staggered manner in the cross section, that is, the disc-shaped member 1
1 cylindrical protrusion 14. The inner cylindrical protrusion l4 of the cap-like member l is placed in the annular groove 22 between the cylindrical protrusions 4 and 15, and the inner cylindrical protrusion l4 of the disc-like member 11 is placed in the annular groove 23 between the cylindrical protrusions 4 and 5 of the cap-like member l. The outer cylindrical protrusions l5 are fitted into each other in a non-contact manner with a predetermined gap between them. As a result, conventionally the power supply feedthrough 6
Since the creepage distance from the tip side exposed portion 67a of No. 7 to the base side covering portion 67b, the mounting bracket 71, and the housing 1f63 was short, creeping discharge was easy to occur. The plate-like member 11 is provided with cylindrical protrusions 4, 5, 14.15 to substantially increase the creepage distance, and the hollow disc-like member 11 and the base-side covering portion where it engages with the power feeding feedsle 67 are provided. 67b is joined all around to prevent discharge from directly to the housing lid 63, making it possible to avoid the above-mentioned conventional disadvantages. That is, according to this structure, even if a higher load voltage is newly supplied to the repeater in the future, it is possible to almost eliminate creeping discharge, and therefore it becomes possible to fully meet future needs.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reliably increase the creeping distance from the tip-side exposed portion of the power feeding feedthrough to the housing lid, thereby making it possible to significantly suppress the occurrence of creeping discharge.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the insulating mounting structure for the power feed feedthrough according to the present invention, Fig. 2 is a perspective view of a cap-like member, and Fig. 3 is a longitudinal cross-sectional view of the cap-like member of Fig. 2. , FIG. 4 is a perspective view of the hollow disc-shaped member, FIG. 5 is a vertical cross-sectional view of the hollow disc-shaped member of FIG. 4, and FIG. 6 is a side view schematically showing the internal structure of the Koumi repeater. FIG. 7 is a longitudinal cross-sectional view of a conventional insulating mounting structure for a power supply feedthrough, and FIG. 8 is a vertical cross-sectional view of a power feedthrough installed through a housing lid. l... Cap-shaped member, 4... Inner cylindrical protrusion,
5... Outer cylindrical protrusion, 11... Hollow disk-shaped member, 14... Inner cylindrical protrusion, 15... Outer cylindrical protrusion, 63... Housing lid, 67. ...Power feed through, 68...Cylindrical body, 67
a: Exposed portion on the tip side, 67b: Covered portion on the base side. Embodiment 1 of power supply fiddle mounting structure Figure 1 Perspective view of cap-shaped member Name 2 Figure Longitudinal sectional view of cap-shaped member Figure 3 Perspective view of plate member 6 Longitudinal cross-sectional view of hollow disc member FIG. Part 15...Outer cylindrical protrusion 16...Central hole 17...Mounting hole 22...Annular groove Internal structure of optical submarine repeater Fig. 6 61...Pressure casing 62... Repeater unit 63...Casing lid 64...Joint chamber cover 65...Optical cable 66...Power feed line 67...Power feeder Conventional power feeder mounting 11 structure Figure 7/2 =-・Huck 7 Tsufling 82・・・Hollow disk-shaped member

Claims (1)

[Claims] 1. A power feedthrough (67) consisting of a conductive cylindrical body (68) whose outer surface is generally coated with an insulating resin, which is installed through a housing lid (63) that partitions the inside of the optical submarine repeater. The part that protrudes from the housing lid (63) when the power supply feedthrough is inserted is a covering part (covered with insulating resin) on the base side (
67b) and an exposed portion (67a) from which the insulating resin on the tip side has been removed, and the base side covering portion (67b) is a hollow disc made of insulating resin with a central hole into which the exposed portion (67a) is fitted. The shaped member (11) is attached to the distal end side exposed portion (67).
In a), in the insulating mounting structure of the power supply feedsle in which the cap-shaped member (1) made of insulating resin is attached, the base side covering portion (67b) of the power supply feedsle (67) and the hollow disc-shaped member are attached. (11) are fused and joined over the entire circumference at their fitting portions, and the hollow disk-shaped member (11) and the cap-shaped member (1) are formed in a concentric circle with respect to their substantially coincident central axes. At least I protruding cylindrical protrusions (4, 5, 14, 15) are provided respectively, and the power feeding feedthrough (67)
An insulating mounting structure for a power supply feedthrough, characterized in that the creepage distance from the tip-side exposed portion (67a) to the housing lid (63) can be substantially increased.