JPH04101102A - Heat radiating and buffering structure of optical submarine repeater - Google Patents

Abstract

PURPOSE:To improve the heat radiation characteristics without spoiling buffering characteristics by providing a couple of pressure plates which press both ends of a cylindrically molded spring so that they are inscribed with a watertight metallic cylinder and extend to both ends of a repeater circuit unit, sealing the space part where a metallic formed spring is stored, and charging gaseous helium in the space part. CONSTITUTION:The annular pressure plates 30 which are inscribed with the watertight metallic cylinder 8 and extend over an insulator 6 on the repeater circuit unit 4 are energized in one direction by a disc spring 36 held by a retainer 38 and pressed against the insulator 6 formed on the end surface of the metallic formed spring 12 and the end surface of the repeater circuit unit 4. Then a 1st O ring 32 is interposed in an annular groove 30a and a 2nd O ring 34 is interposed in an annular groove 30b to hermetically seal the space part where the metallic formed spring 12 is stored. The gaseous helium 41 is charged in the space part, whose sealing opening 40 is sealed with a sealing plug 42. Consequently, the heat radiation characteristics can be improved without spoiling the buffer effect of the metallic formed spring.

Description

[Detailed Description of the Invention] Summary Regarding a heat dissipation/buffer structure for an optical submarine repeater that improves the heat dissipation performance and impact resistance of the optical submarine repeater, the present invention aims to improve the heat dissipation property without compromising the buffer property. The purpose of this study is to provide a heat dissipation/buffer structure for an optical submarine repeater in which a metal molded spring is interposed between the outer periphery of a repeater circuit unit and a water pressure resistant metal cylinder. , a pair of pressing plates for pressing both ends of the cylindrical molded spring are provided so as to be inscribed in the water pressure resistant metal cylinder and extend to both ends of the repeater circuit unit, and the metal molded spring is accommodated by a sealing means. The sealed space is sealed, and the sealed space is filled with helium gas.

INDUSTRIAL APPLICATION FIELD The present invention relates to a heat dissipation/buffer structure for an optical submarine repeater that improves the heat dissipation performance and impact resistance of the optical submarine repeater.

Optical submarine repeaters are required to have a long lifespan and reliability of, for example, 25 years or more, and are highly reliable with sufficient resistance to shocks that the repeater receives during installation and temperature rises within the repeater. Parts must ensure their functionality. The long-term reliability of repeater circuit components is greatly influenced by the temperature of the parts where the components are mounted.The lower the temperature, the higher the reliability.The heat generated in the repeater circuit must be efficiently dissipated into the seawater. That is important. Furthermore, optical submarine repeaters are becoming more and more densely packaged, and when they are densely packaged, the power consumption of repeaters of the same size increases, so improving heat dissipation characteristics is an important issue.

On the other hand, the installation of optical submarine repeaters is carried out by submarine cable laying ships. Therefore, in order to reduce the shock that the optical submarine repeater receives when it is laid by a submarine cable-laying ship, the circuit unit of the optical submarine repeater is housed in a rigid housing that is resistant to water pressure via springs. ing.

Therefore, in order to protect the optical submarine repeater, there is a need for a heat dissipation/buffer structure for the optical submarine repeater that has good thermal conductivity and has a buffering effect.

2. Description of the Related Art A conventional heat dissipation/M new structure of an optical submarine repeater is constructed as shown in FIG. 3, for example. The outer periphery of the repeater circuit unit 4 of the optical submarine repeater 2 is covered with an insulator 6. Reference numeral 8 denotes a water pressure resistant metal cylinder made of, for example, aluminum copper, and together with a pair of end plates 10 and 10 also made of aluminum copper, a water pressure resistant repeater housing is constructed. . A metal molded spring 1 is disposed between an insulator 6 provided on the outer periphery of the repeater circuit unit 4 and a water pressure resistant metal cylinder 8.
2 is interposed. The end surface of the cylindrical molded spring 12 is pressed by a pair of annular pressing plates 14 fixed by a retainer 16.

Reference numeral 18 denotes a terminal cable connected to a large-diameter optical submarine cable (not shown), which is introduced into the repeater housing via the optical fiber introduction part 20 provided on the end plate 10, and is connected to the optical fiber N22 and the optical fiber of the terminal cable 18. A power supply line 24 is connected to the repeater circuit unit 4. 26 is a connection ring;
This connection ring 26 connects the optical submarine repeater 2 to a cable retaining section (not shown).

Therefore, the heat generated in the repeater circuit unit 4 of the optical submarine repeater 2 is radiated into the seawater by thermal conduction via the metal molded spring 12, and the impact when the repeater is installed is absorbed by the metal molded spring 1.
2 to provide a buffer.

However, heat dissipation is performed by thermal conduction through the metal molded spring 12, and the metal molded spring 12 in the space between the repeater circuit unit 4 and the water pressure resistant metal cylinder 8 is sufficient. The proportion occupied by this gas is approximately 30%, and the remaining approximately 70% is occupied by nitrogen gas which is substituted in the repeater. As repeater circuit units are mounted in high density, their heat generation also increases, so good heat dissipation characteristics are required. However, conventional heat dissipation/buffer structures have There is a problem in that the t1 heat dissipation is not sufficient because about 70% of the space between the cylinder and the cylinder is occupied by nitrogen gas, which has poor thermal conductivity.

The present invention has been made in view of these points, and its purpose is to provide a heat dissipation/buffer structure for an optical submarine repeater that improves heat dissipation characteristics without impairing the buffer characteristics. It is.

Problems to be Solved by the Invention Means for Solving the Problems Heat dissipation/buffer structure of the conventional optical submarine repeater described above The circuit part of the optical submarine repeater is composed of the outer periphery of the repeater circuit unit and the water pressure resistant metal cylinder. In the heat dissipation/buffer structure of an optical submarine repeater that uses a metal molded spring interposed between the impact when the cable is installed, a pair of holding plates that hold down both ends of the metal molded spring are inscribed in a water pressure resistant metal cylinder, and the repeater circuit is Provided so as to extend to both ends of the unit. Then, the space in which the cylindrical molded spring is accommodated is sealed by the sealing means, and the thus sealed space is filled with helium gas.

Function: By filling the space in which the metal molded spring is accommodated with helium gas instead of the conventional nitrogen gas, the heat conduction of the space can be improved about 10 times compared to the conventional one. As a result, most of the heat dissipation from the repeater circuit unit is performed through the metal molded spring, but it is also performed through the helium gas, which has relatively good thermal conductivity, filled in the space, so the overall Heat dissipation characteristics can be significantly improved compared to conventional structures.

It is possible to fill the entire interior of the repeater with helium gas, but since helium gas has poor dielectric strength, it is impossible to fill the entire interior of the repeater with helium gas, where a maximum of 15 kV is applied. be.

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the description of this embodiment, components that are substantially the same as those of the conventional structure shown in FIG. 3 are denoted by the same reference numerals, and a portion of the description thereof will be omitted.

FIG. 1 shows a cross-sectional view of an embodiment of the present invention, in which an insulator 6 formed on the outer periphery of a repeater circuit unit 4 and an IJ
Similar to the conventional structure, a metal molded spring 12 is interposed between the water pressure resistant metal cylinder 8 made of IJum copper.

The retainer 3 is an annular holding plate 30 that is inscribed in the water pressure-resistant metal cylinder 8 and extends across the insulator 6 on the repeater circuit unit 4.
The end face of the metal molded spring 12 and the repeater circuit unit 4 are biased in one direction by the disc spring 36 held by the spring 8
It is pressed into contact with an insulator 6 formed on the end face of.

An annular groove 3 is provided on the repeater circuit unit side of the annular holding plate 30.
0a is formed, and an annular groove 30b is also formed on the outer peripheral surface of the annular pressing plate 30. A first 0-ring 32 is interposed in the annular groove 30a, and a 20th-U puffer 34 is interposed in the annular groove 30b to airtightly seal the space in which the metal molded spring 12 is accommodated. It has stopped. This space is filled with helium gas 41 by a method described later through a helium gas filling port 40 formed in the annular pressing plate 30, and the filling port 40 is filled with a sealing plug 4.
It is sealed by 2.

Next, the helium gas filling step will be explained with reference to FIG. Connect the tube 44 to the helium gas filling port 4
0, the switching valve 46 is switched to the vacuum pump 48 side, the vacuum pump 48 performs vacuum suction as shown by arrow A, and the space in which the metal molded spring 12 is accommodated is evacuated. Next, the switching valve 46 is switched to the helium gas enclosure 50 side, and helium gas is caused to flow as shown by the arrow to fill the evacuated space with helium gas. Next, by closing the sealing port 40 with the sealing plug 42, the space in which the metal molded spring 12 is accommodated is filled with hem ram gas to airtightly seal the space.

With this configuration, in addition to the original heat conduction by the cylindrical molded spring formed from the metal net, the repeater Heat dissipation from the circuit unit can be further improved.

Effects of the Invention Since the heat dissipation/buffer structure of the optical submarine repeater of the present invention is configured as detailed above, it has the effect of further improving its heat dissipation characteristics without impairing the buffering effect of the metal molded spring. Improved heat dissipation improves component reliability, making it possible to handle high-density packaging of repeater circuit units, which is expected to be developed in the future.

In addition, screening must be carried out to ensure the reliability of parts, but as heat dissipation improves and the temperature of parts can be lowered, screening time can be shortened and manufacturing operations can be reduced. It is expected that the time will be shortened.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. Figure 2 shows the helium gas filling stage. FIG. 3 is a sectional view of a conventional example. Explanatory diagram, repeater circuit unit, Water pressure resistant metal cylinder, O... end plate, 2...metal molded spring, 8...terminal cable, 6. Connection ring, 0... annular holding plate, 2...10-link, 4...20th ring, 6. disc spring, 1. Helium gas. Shinweiki Ij] Dedicated Any Nodo X pressure resistant 4L Torien- Strive to A w5ba rate Fake 2L contradiction O-ri/2 To the plate He power 1-Mi　Hosei7ita'j　-1 Usumaro [? ]Figure 1

Claims (1)

[Claims] 1. A heat dissipation/buffer structure for an optical submarine repeater in which a metal molded spring (12) is interposed between the outer periphery of the repeater circuit unit (4) and a water pressure resistant metal cylinder (8), A pair of pressing plates (30) for pressing both ends of the metal molded spring (12) are provided inscribed in the water pressure resistant metal cylinder (8) and extending to both ends of the repeater circuit unit (4). A heat dissipation system for an optical submarine repeater, characterized in that the space in which the metal molded spring (12) is accommodated is sealed by a sealing means, and the sealed space is filled with helium gas (41). Buffer structure. 2. The sealing means is provided between the first O-ring (32) between the holding plate (30) and the repeater circuit unit (4), and the sealing means between the holding plate (30) and the water pressure resistant metal cylinder (8). The second O-ring (34) provided in between and the presser plate (30) are connected to the end face of the repeater circuit unit (4) and the cylindrical molded spring (1).
2) biasing means (36) that biases the end face of
The heat dissipation/buffer structure for an optical submarine repeater according to claim 1, characterized in that it is comprised of the following.