JP3046546B2 - Heating unit storage power pole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pole in which a heat-generating unit is housed and which is provided with a heat radiation measure.

[0002]

2. Description of the Related Art In recent years, an optical access system using an optical fiber has been introduced into an access network connecting a telephone station and a subscriber. The optical access system includes a system in which a central unit and a subscriber unit are directly connected by an optical fiber, and an ONU having an optical signal / electrical signal conversion function near a subscriber [optical subscriber line network device (optical network termination device). )], And connect the optical line cable between the optical line terminal and the ONU.
There is a method in which a cable is connected between a subscriber and a subscriber.

[0003] The final mode of the optical access system is the former system. However, in an area where there are many small users such as home users, the latter system is considered to be more advantageous in terms of information volume, economy, etc. for the time being. I have. In the latter method, a method of installing ONUs on a road is called FTTC (Fiber To The Curb). In the FTTC method, it has been proposed to store ONUs in a box installed on the side of a road.

[0004]

However, the ONU is located on the side of the road.
Installing a storage box often has problems in terms of securing an installation space. Therefore, the present inventors have considered storing the ONU in a hollow telephone pole. However, ONUs include, as main components, active devices such as an optical / electrical conversion circuit and a demultiplexing circuit, and a power supply circuit (having an AC / DC conversion function and a lightning surge protection function) for supplying power to these circuits. The active device and the power supply circuit both generate heat. Storing such a heat-generating unit in a hollow electric pole has the following problems. That is, since the electric pole is exposed to direct sunlight and has a structure in which the inside air and the outside air are not easily exchanged, the inside temperature rises remarkably in summer or the like. If a heat-generating unit such as an ONU is housed in such a place, the temperature rise will be more severe, and the function as a unit may be impaired.

It is an object of the present invention to provide a heat generating unit housing power pole which solves such a problem.

[0006]

According to the present invention, there is provided a heat generating unit containing electric pole, in which a pipe having a thickness capable of forming a gap between the hollow electric pole and an inner peripheral surface of the hollow electric pole is arranged in a vertical direction. The upper end is opened at the upper end of the hollow telephone pole, the lower end of the pipe is opened inside the hollow electric pole, and a heat-generating unit such as an ONU is installed near the lower end of the pipe inside the hollow electric pole. It is characterized by having pores.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In the figure, reference numeral 11 denotes a hollow telephone pole set up on the ground. A trumpet-shaped member 13 is attached to the upper end of the hollow telephone pole 11. The outer tubular portion of the flared member 13 is fitted to the upper end of the hollow power pole 11, and the inner tubular portion is
Located within. The upper end of the pipe 15 is connected to the inner cylindrical portion of the flared member 13. As a result, the pipe 15
The hollow pole 1 is supported at its upper end by a trumpet-shaped member 13.
1 is suspended. As a result, the hollow electric pole 11 is open at the upper end at the upper end of the hollow electric pole 11 and opens at the lower end inside the hollow electric pole 11. As the pipe 15, a pipe having a thickness allowing air to freely flow therethrough and having a gap between the pipe 15 and the inner peripheral surface of the hollow telephone pole 11 is used.

An ONU 17 is installed near the lower end of the pipe 15 in the hollow telephone pole 11. The ONU 17 is connected to an optical fiber cable 19 and a metal cable 21 drawn into the hollow telephone pole 11. The optical fiber cable 19 connects the optical line terminal to the ONU 17 near the subscriber. The ONU includes an N-ONU (communication optical network terminating device) and a V-ONU (video optical network terminating device). In the case of the N-ONU, the metal cable 21 is formed of a pair wire, and the V-ONU is used. In the case of, the metal cable 21 is formed of a coaxial cable. In the metal cable 21, individual pair wires or coaxial cables are branched at appropriate locations and connected to the subscriber's equipment. The length of the metal cable 21 is up to about 100 m.

The ONU 17 requires electric power because it includes an optical signal / electrical signal conversion circuit and the like. For this reason, the hollow telephone pole 11
A power line 23 is drawn inside to supply power to the ONU 17. The ONU 17 includes a power supply circuit having an AC / DC conversion function, a lightning surge protection function, and the like. This power supply circuit also becomes a heat source. In addition, hollow telephone pole 11
A battery 25 is installed as a standby power supply in the inside.
7 is supplied.

A vent hole 29 is provided above the lower end of the pipe 15 of the hollow telephone pole 11. The vent hole 29 is for discharging the air heated in the hollow electric pole 11 to the outside. On the lower part of the hollow telephone pole 11 is an ONU 17
An opening 31 is provided at a position corresponding to. This opening 31 accommodates the ONU 17 in the hollow telephone pole 11,
This is for performing various operations in the ONU 17. The opening 31 is normally closed by a lid 33 that can be opened and closed. A rain shield 35 is attached to the upper end of the hollow electric pole 11 at an appropriate distance from the trumpet-shaped member 13.

The power pole for storing the exothermic unit shown in FIG. 1 is configured as described above. With such a configuration, when the temperature of the hollow power pole 11 rises due to direct sunlight or the like hitting the hollow power pole 11, air flows as shown by arrows in the hollow power pole 11. That is, when the temperature inside the hollow power pole 11 rises, the heated air rises between the hollow power pole 11 and the pipe 15 and goes out through the vent hole 29, and accordingly, the outside temperature is relatively low. Air is a hollow telephone pole 11
From the upper end of the pipe 15 into the hollow electric pole 11. In this way, the air inside the hollow power pole 11 is replaced with the outside air, so that it is possible to suppress the temperature rise inside the hollow power pole 11. Further, since the ONU 17 is installed near the lower end of the pipe 15, it is easily cooled by air entering from the outside, and the heat generated in the ONU 17 is discharged to the outside of the hollow telephone pole 11 by the flow of air. . For this reason, the temperature rise of the ONU 17 can be suppressed.

It is preferable that a heat radiating fin 37 and a heat sink (not shown) are attached to the ONU 17 in order to enhance the heat radiation effect. In addition, since the power line is drawn into the hollow power pole 11, it is turned on if necessary.
A fan that blows air toward U17 may be installed. In addition, a temperature sensor or the like can be installed in the hollow telephone pole 11 as necessary.

Next, a second embodiment of the present invention will be described with reference to FIG. In the above-described first embodiment, the case where the optical fiber cable is laid aerial and it is drawn into the hollow telephone pole has been described. However, in this embodiment, the optical fiber cable 19 laid underground is connected to the hollow telephone pole. 11 is connected to the ONU 17. The other configuration is the same as that of the embodiment of FIG.

In the above two embodiments, the case where ONUs are housed in hollow electric poles has been described. However, the present invention is not limited to this, and the same applies to the case where heat generating units other than ONUs are housed in hollow electric poles. It can be applied to

[0015]

As described above, according to the present invention, it is possible to create an air flow in which the heated air flows out and the low-temperature external air flows into the hollow electric pole. In addition, it is possible to suppress an increase in the temperature of the heat generating unit housed in the hollow telephone pole. For this reason, a heat-generating unit such as an ONU can be housed in a hollow telephone pole, and there is an effect that it is easy to secure an installation space for the heat-generating unit.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a heat generating unit housing power pole according to the present invention.

FIG. 2 is a sectional view showing the second embodiment.

[Explanation of symbols]

 11: hollow electric pole 13: trumpet-shaped member 15: pipe 17: ONU (heat generating unit) 19: optical fiber cable 21: metal cable 23: power line 25: battery 27: lead wire 29: ventilation hole 31: opening 33: lid 35 ： Rain shield

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-140250 (JP, A) JP-A-6-2766651 (JP, A) JP-A-1-114321 (JP, A) JP-A-9-09 145973 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02G ^7/ 00-7/22

Claims (2)

(57) [Claims] 1. A pipe having a thickness that allows a gap to be formed between the hollow power pole and an inner peripheral surface of the hollow power pole is vertically arranged, an upper end of the pipe is opened at an upper end of the hollow power pole, and a lower end of the pipe is connected to the lower end of the pipe. Open inside the hollow power pole, install a heat generating unit near the lower end of the pipe in the hollow power pole, and provide a ventilation hole above the lower end of the pipe of the hollow power pole, so that direct sunlight
When the temperature of the hollow pole rises,
The air heated by the temperature rise of the
When you go up between the pillar and the pipe and go outside through the vent
In both cases, the outside air is accordingly discharged from the top of the hollow telephone pole.
The air that descends inside the pipe and enters the hollow telephone pole
An electric pole for housing a heat-generating unit, wherein the electric pole is adapted to generate a flow . 2. The heat-generating unit is an ONU (Optical Subscriber Line Network Device), and an optical fiber cable and a metal cable are led into a hollow telephone pole, and the optical fiber cable and the metal cable are connected to the ONU. The power pole according to claim 1, wherein the power pole is housed in the heating unit.