JPH0453038Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a communication device, particularly to a heat dissipation convection structure for performing natural air cooling by air convection in an optical communication device.

FIGS. 1a and 1b are a perspective view and a side sectional view, respectively, showing the structure of a conventional communication device. A rack 1 housing an optical communication device is a metal box-shaped case. The upper surface is provided with an opening 100 that serves as an exhaust port and a cable or cord outlet, and the front side is provided with an opening for arranging the shelf 3 in the rack 1. 3. A frame is provided for screwing and mounting the convection plate 4 and front plate 2. Shelf 3 has an opening on the front and a printed wiring board 3 on the back.
2, and an exhaust port 30 and an intake port 31 are provided on the upper and lower surfaces, respectively. The front plate 2 is a metal plate provided with an intake port 20. After installing the package 5 or 6 into the shelf 3 in a plug-in manner and connecting it to the printed wiring board 32 on the back side using the connector 10, the front plate 2 is a metal plate provided with an intake port 20. mounted on. Multiple Shelves 3 in Rack 1,
They are arranged vertically at predetermined intervals, making it easy to
The opening created between the shields 3 on the front of the is also the intake port 1.
10, and connect the rack 1 from the bottom of this intake port.
A convection plate 4 formed so that its plate surface rises at a predetermined slope toward the inner back surface is attached between the upper and lower shelves 3. A predetermined interval is provided between the back side of the rack 1, the back side of the shelf 3, and the rear end of the convection plate 4 to accommodate cables such as cables (not shown) and optical fiber cords 9, as well as to accommodate exhaust air flow. A duct 120 is formed to guide the flow. That is, the rear part of the rack is the duct 120. Package 5 converts the optical signal into an optical fiber.
This is an optical transmission package that sends out signals to the cord 9, and the package 6 is an electronic equipment package that sends and receives electrical signals.

The package 5 is equipped with a light emitting element 7 for converting an electrical signal into an optical signal, and the optical signal sent out by the light emitting element 7 is transmitted through an optical connector 8 into an optical fiber cord 9.

During operation of the device, the air heated by the heat generated by each package 5 or 6 exits through the exhaust port 30 on the top surface of the shelf 3, as shown by the solid line arrow A, and then exits through the exhaust port on the top surface of the rack 1. 100 or is guided by the convection plate 4 and passed through the duct 120 on the back side and exhausted from the exhaust port 100 on the top surface of the rack 1. Along with this, as shown by the broken line arrow B, new air is sucked in through the intake port 20 of the front plate 2, and new air is also sucked in from the intake port 110, which is the opening between the shields 3, and the convection plate 4 and is fed into the shelf from the intake port 31 on the lower surface of the shelf 3 to perform natural air cooling.

In the structure of such a communication device, in order to suppress the temperature rise of the light emitting element 7, which generally has low heat resistance, to the lowest possible level, it is necessary to mount the light emitting element 7 near the lower front of the shield 3 so as not to be hit by the airflow with increased temperature. There is. As a result, the optical fiber code 9
must be guided below the shelf 3 and connected to the light emitting element 7 with an optical connector 8, and an optical fiber cord 9 is introduced between the bottom surface of the shelf 3 and the rear end of the convection plate 4 below it. A gap 130 must be provided for this purpose. In the structure of conventional communication equipment, high-temperature air rising through the duct on the back of the rack 1 enters through this gap and is sent to the intake port 31 on the bottom of the shelf 3, reducing the heat dissipation effect and causing damage to the package. There is a disadvantage that the temperature rise of the package 5 further increases and the reliability of the package 5 decreases.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a structure for a communication device in which high-temperature airflow passing through a rear duct does not enter through the inlet of the optical fiber cord.

In the structure of the present invention, a plurality of shelves for accommodating packages of optical communication equipment are disposed in a rack, and a convection plate is further disposed for guiding air flow between the shelves, and the front surface of the rack is provided with a convection plate for guiding airflow between the shelves. In the structure of a communication device of the front intake/rear exhaust type, which sucks air from the inside of the rack and directs the hot air flow through the rear part of the rack to the outside of the rack, one end of an optical fiber cord led from below. A gap between a rear end of the shelf housing the package connected to the shell and a rear end of the convection plate provided below the shelf is closed over the entire width with a flexible member, and the flexible member It has a structure in which the optical fiber cord is passed through and held.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a side sectional view showing an embodiment of the present invention. This example is based on a conventional structure (see Fig. 1b).
In contrast, the introduction port 90 of the optical fiber cord 9
A structure is added in which two foamed rubber plates 11 and 12 are stacked and sandwiched in place. That is, the optical fiber cord 9 is formed between the rear end of the lower surface of the shelf 3 equipped with the package 5 connected to the optical fiber cord 9 and the rear end of the convection plate 4 disposed below. introduction port 90
Then, two foamed rubber plates 11 and 12 are stacked and sandwiched, and the optical fiber cord 9 is held between the two foamed rubber plates 11 and 12. The foamed rubber plates 11 and 12 have a length sufficient to close the entire width of the gap forming the inlet 90 of the optical fiber cord 9, and both are connected to the shield 3 and the convection plate 4 using screws 13. It is attached and fixed to the board surface of.

Due to the elasticity of the foamed rubber plates 11 and 12, the introduction port 90 of the optical fiber cord 9 can be closed without any gaps, and the high temperature airflow rising from the package 3 below the convection plate 4 can be introduced as in the conventional case. All ducts 120 on the back without entering through the mouth
and is discharged from the exhaust port 100 on the top surface of the rack 1.

In addition, the foam rubber plate 1 of the optical fiber cord 9
Since the portion held between 1 and 12 is held in place by a soft and flexible material, no pressure large enough to deform the cross section of the optical fiber is applied. Therefore, the optical fiber cord 9 can be held without increasing optical transmission loss due to cross-sectional deformation of the optical fiber core.

Note that instead of holding the optical fiber cord 9 between two foamed rubber plates 11 and 12,
It is clear that the same effect can be obtained by using a foamed rubber plate provided with a hole through which the optical fiber cord 9 passes. Also, instead of fixing the foam rubber plates 11 and 12 with screws 13,
A similar effect can be obtained by fixing with adhesive, but if it is fixed with screws 13 as in this embodiment, it can be easily removed during repair work.

As is clear from the above description, the present invention has the effect of realizing a communication device structure in which high-temperature airflow passing through the rear duct does not enter the shield through the introduction port of the optical fiber cord.

[Brief explanation of the drawing]

1A and 1B are a perspective view and a side sectional view showing the structure of a conventional communication device, respectively, and FIG. 2 is a side sectional view showing an embodiment of the present invention. 1...Rack, 2...Front plate, 3...Shelf, 4...Convection plate, 5, 6...Package, 7...
...Light emitting element, 8...Optical connector, 9...Optical fiber cord, 10...Connector, 11, 12...
...Foamed rubber plate, 13...screw.

Claims (1)

[Claims for Utility Model Registration] “A plurality of shelves for accommodating packages of optical communication equipment are arranged in a rack in the vertical direction, and between the shelves are arranged diagonally upward from the front side of the rack to the rear side inside the rack. A convection plate is provided which guides air flow from the front surface of the rack to the lower surface of the shelf, and air is sucked in from the front surface of the rack, enters the shelf, becomes a hot air flow, and is heated from the exhaust port on the upper surface of the shelf. In the structure of the communication device of the front intake/rear exhaust type in which the airflow is discharged from the upper surface of the rack through the rear part of the rack, a gap between the rear part of the rack and the upper surface of the convection plate and the lower surface of the shelf is provided. An optical fiber is introduced into the package from the lower surface of the shelf through the shield, and the gap between the rear end of the upper surface of the convection plate and the rear end of the lower surface of the shield is closed over the entire width with a flexible member, and the flexible member A structure of a communication device characterized by sandwiching the optical fiber.