JPS6241282Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a sealing structure for an optical fiber introduction part used in a part where there is a pressure difference between the inside and outside of a submarine repeater for optical communications.

Prior Art and Problems Figure 1 is a diagram for explaining the structure of a conventional optical fiber sealing part, in which a is a cross-sectional view of a submarine repeater, and b is a cross-sectional view of a submarine repeater.
is a sectional view of the sealing part, and c is a diagram showing the retaining member thereof. In the same figure, 1 and 1' are optical cables, 2
is a submarine repeater, 3 is its bulkhead, 4 is an optical fiber,
Reference numeral 5 denotes an optical fiber introducing section, 6 an amplifier, 7 a rubber bush, 8 a presser thereof, 9 an optical fiber retaining member, and 10 a tapered hole provided in a partition wall.

Since the submarine repeater 1 shown in Fig. a is installed in the bottom sea, extremely high pressure is applied to its casing. Therefore, the introduction part of the optical fiber 4 in the partition wall 3 has b
A sealing structure as shown in the figure is used. In this sealing structure, the optical fiber 4 passing through the rubber bush 7 is inserted into the tapered hole 10 of the partition wall and sealed using two half-split tapered retaining members 9 made of resin as shown in FIG. When high pressure is applied, this retaining member 9 is thrust toward the low pressure side, thereby tightening and retaining the optical fiber 4.

However, such a sealing structure has the disadvantage that as the number of optical fibers increases, the assembly work becomes much more difficult.

Purpose of the invention In view of the above-mentioned drawbacks of the conventional technology, the present invention aims to provide an optical fiber sealing part structure that has good workability even when the number of optical fibers is large, in the introduction section where optical fibers are introduced from the high voltage side to the low voltage side. This is the purpose.

Structure of the invention According to the invention, an optical fiber is sealed in a rubber bushing type optical fiber sealing part that hermetically seals an optical fiber introduced from a high pressure part to a low pressure part through a partition wall using a rubber bushing and a retaining member. The retaining member includes a hard cylindrical inner member having a plurality of longitudinal grooves, and a soft truncated conical member having a hollow portion into which the inner member can be inserted and a groove facing the longitudinal grooves of the inner member. An optical fiber sealing unit comprising an outer member of the same construction as the inner member and an outer member, the optical fiber being sandwiched between the grooves of the inner member and the outer member, and inserted into a tapered hole provided with a partition wall to simultaneously retain a plurality of optical fibers. This is achieved by providing structure.

Examples of ideas Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram for explaining the optical fiber sealing structure according to the present invention, in which a is a cross-sectional view, b is a perspective view of the optical fiber retaining member, and c is a cross-sectional view.

In the figure, 3' is a partition wall of a repeater, etc., 11 is a high pressure side, 12 is a low pressure side, 13 is an optical fiber, 14 is a rubber bushing, 15 is a holding member thereof, 16 is an outer member of the optical fiber retaining member, and 17 is a The inner members 18 of the fiber optic retaining members each indicate a tapered hole provided in the partition wall.

In this embodiment, as shown in FIG. 2a, a rubber bush 14 fixed by a presser member 15 is provided on the high-pressure side of the partition wall 3', and the optical fiber 13 is connected to the high-pressure side 11 of the partition wall 3'.
The rubber bush 14 is inserted through the rubber bush 14, and the optical fiber retaining members 16 and 17 are inserted into a tapered hole 18 provided in the partition wall 3' to be introduced into the low pressure side.

The retaining members 16 and 17 are the main points of the present invention,
As shown in the perspective view of FIG. 2b and the cross-sectional view of FIG. formed, the outer member 1
6 is made of softer plastic such as nylon or epoxy. and outer member 16
and the inner member 17 are provided with longitudinal grooves 16a and 17a, respectively, through which an optical fiber can be inserted into the joint when the members are assembled.
At the bottom of the outer member 16, the groove 16a is connected to the hole 16b.
It is becoming.

In this embodiment configured in this way, as shown in FIG. 2, when high pressure is applied from the high pressure side 11, the rubber bush 14 is pressed and deformed, causing the retaining member 1 to deform.
6 and 17 into the tapered hole 18. Therefore, the outer member 16 of the retaining member receives a compressive force from the outer periphery and strongly clamps the optical fiber 13 between it and the inner member 17, increasing the retaining force. Furthermore, in this embodiment, since the two retaining members, the outer member 16 and the inner member 17, can retain a plurality of optical fibers, the assembly work is significantly simpler than in the past.

Note that the outer member 16 of the retaining member shown in FIGS. 2b and 2c needs to be inserted through the entire length of the optical fiber when the extra length is long, but it is a hollow truncated conical shape with a bottom as shown in FIG. 3. The outer member 16 may be divided into two to form an outer member 16'. Figure 3a is an external perspective view of the outer member 16', figure b is a sectional view when the member 16' of figure a is combined, and c
The figure is a view of figure b seen from direction A, and figure d is a view of figure b seen from direction B.

By using such a two-part outer member 16', the retaining member can be attached more easily even when the optical fiber has a long extra length.

Effects of the invention As explained above in detail, the optical fiber sealing structure of the invention can hold multiple optical fibers with a simple structure with good workability by devising the holding member. The effect is huge.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the conventional optical fiber sealing part structure, Fig. 2 is a diagram for explaining the optical fiber sealing part structure according to the present invention, and Fig. 3 is another embodiment of the retaining member. It is a figure which shows an example. In the drawing, 3' is a partition wall, 13 is an optical fiber, 14 is a rubber bushing, 15 is a holding member thereof,
16, 16' are outer members of the optical fiber retaining member; 17 are inner members of the optical fiber retaining member;
8 indicates a tapered hole, respectively.

Claims (1)

[Scope of utility model registration request] In a rubber bush type optical fiber sealing unit that airtightly seals an optical fiber introduced from a high pressure section to a low pressure section through a partition wall using a rubber bushing and a retaining member, the optical fiber retaining member is a hard fiber having a plurality of vertical grooves. It consists of a cylindrical inner member and a soft truncated conical outer member having a hollow portion into which the inner member can be inserted and a groove opposite to the longitudinal groove of the inner member. An optical fiber sealing structure characterized in that a plurality of optical fibers are held at the same time by sandwiching the optical fibers in a groove and inserting the optical fibers into a tapered hole provided in a partition wall.