JPS6018158B2 - Buffer structure of optical submarine repeater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for alleviating vibrations and shocks transmitted to a repeater circuit unit within an optical submarine repeater cliff and protecting optical components such as electronic circuits and lasers within the repeater circuit unit.

The circuit unit inside the body of a typical optical submarine repeater generates about 5 calories of heat.

Therefore, the ambient temperature inside the repeater circuit unit increases. The life of the laser mounted in the repeater circuit unit deteriorates when the ambient temperature around the laser is high, and the life becomes longer as the ambient temperature is lower. On the other hand, when an optical submarine repeater is installed on the seabed at a depth of several hundred meters or more, the temperature of the outer surface of the repeater's cover is approximately that of the water below the seafloor2.
The temperature will be ~3℃. Therefore, it is effective to efficiently transmit the heat generated by the repeater unit to the outer surface of the repeater casing and to make the repeater body function as a heat exchanger. Therefore, from the perspective of heat transfer design considering the reliability of lasers, optical components, and electronic circuits, it is best to insulate the outside of the cylindrical repeater circuit unit with an insulator such as polyethylene that is as thin as possible, and to directly relay it. It is desirable to contact the inner wall of the genital body cylinder.

However, with this structure, the repeater circuit unit housed inside the repeater case is directly subjected to vibrations and shocks during transportation after mounting, and shocks reaching several G to 1 G during cable installation. This can cause a decrease in the reliability of circuit components such as lasers and optical components, so it is important to create a structure that prevents vibrations and shocks from being transmitted to the repeater circuit unit as much as possible, and also to have a good heat transfer design. desirable. In order to solve this problem, the present invention inserts a cylinder made of a metal plate so as to make contact with the insulator on the outside of the repeater circuit unit and the inner wall of the repeater sparrow. By providing a small orifice on the outside surface, for example, air flows out from the orifice and has a damping effect in response to external shocks, which can be used to soften the vibrations and shocks transmitted to the repeater circuit unit. It provides a buffer structure for optical submarine repeaters.

The present invention will be explained in detail below using the drawings. FIG. 1 is a longitudinal sectional view showing the structure of a repeater to which the present invention is applied, in which 1 is a repeater circuit unit, 2 is a polyethylene insulator, 3 is a buffer body according to the present invention, 4 is a repeater housing cylinder, and 5 is a repeater circuit unit. 6 is a holding metal fitting to prevent the repeater circuit unit from moving in the direction of the koji.
is a ring for fixing 5. In addition, mahjong body cylinder 4
The inside is kept airtight by left and right end plates (not shown). 2 and 3 are enlarged views of the buffer body 3, which includes an outer shell 7, an inner shell 8, and side walls 9 made of thin metal plates.
, and a partition wall 101 that partitions the space between the outer shell 7 and the inner shell 8 into several independent air chambers 11, and these air chambers 11 are formed in the repeater lotus body only by an orifice 12 provided in the side wall 9. Opens to other cavities. The side wall 9 is
It is easy to insert the repeater circuit unit 1 inside the buffer body 3,
In addition, so that the inner shell 8 can be easily displaced in the radial direction by vibrations and impacts, it may be tapered as shown in FIG. 2, or it may be made of a highly elastic material such as rubber. Also, the partition wall 10
If the structure is made of a thin corrugated metal plate like 10a shown in FIG. 4, it will be more effective in terms of buffering and heat dissipation. Also, when there is no need to take heat radiation into account, plastics that are easily deformed,
Rubber or the like can also be used. Next, the function of the buffer body having such a buffer structure will be explained.

Now, when the repeater circuit unit vibrates in the direction of the arrow shown in FIG. 1, the buffer body 3 is deformed, the volume of each air chamber 11 increases or decreases, and the internal pressure changes. However, each air chamber 1
1 has an orifice 12 on the side, so the pressure tries to balance inside the airtight structure of the cylinder 4, and in areas where the internal pressure is high, internal air tends to flow out from the orifice 12 to the outside of the buffer body 3. . Therefore, viscous resistance is generated and damping occurs, and the vibration amplitude transmitted to the repeater circuit unit 1 is reduced. In other words, it will receive a buffer. On the other hand, since the buffer body 3 is made of a metal with good thermal conductivity such as thin steel, the thermal resistance can be extremely reduced, the temperature of the repeater circuit unit 1 can be lowered, and the temperature of the laser and optical components can be reduced. It can extend your life. Furthermore, as shown in FIG. 5 as another embodiment, the same buffering effect can be obtained by making the bulkhead 10 itself have a leaf spring structure and providing an orifice 12a on the side surface thereof. Ta
In addition, as another embodiment, elliptical cylinders 13 made of metal plates as shown in FIG. 6b, in which the air chambers 11 divided by partition walls are formed completely independently, are arranged in a textbook as shown in FIG. 6a. It is also conceivable that a small orifice 12b is provided on the side surface or the like.

As described above, the present invention provides a buffer structure for an optical submarine repeater that has a simple structure, has good heat dissipation characteristics of a circuit unit, and has effective buffer characteristics against vibration and shock. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a repeater to which the present invention is applied;
FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention, FIGS. 3 and 4 are transverse sectional views showing an embodiment of the invention, respectively, FIG. 5 is a perspective view showing another embodiment of the invention, FIGS. b is a perspective view showing another embodiment of the present invention and a perspective view showing the structure of its main part. DESCRIPTION OF SYMBOLS 1... Repeater circuit unit, 2... Polyethylene insulator, 3... Buffer body, 4... Repeater land body cylinder, 5...
・・Holding bracket, 6・Ring, 7・Outer shell, 8・・
・Inner shell, 9... Side wall, 10... Partition wall, 10a...
Metal corrugated plate, 11... airtight, 12, 12a, 12b... orifice, 13... elliptical cylinder. Figure 2 Box S Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. Between the outer periphery of the repeater circuit unit and the inner wall of the optical submarine repeater housing having an airtight structure, the circumferential direction is divided into a plurality of air chambers, and the air chambers are separated at both ends in the longitudinal direction. What is claimed is: 1. A buffer structure for an optical submarine repeater, characterized in that a buffer body formed to have an orifice for commonizing is interposed therebetween. 2. The buffer structure for an optical submarine repeater according to claim 1, wherein the buffer is formed of a thin metal plate. 3. The buffer structure for an optical submarine repeater according to claim 1 or 2, wherein each of the plurality of air chambers is provided with an orifice on a side surface thereof.