JPS6330181Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a repeater for a coaxial line equipped with a gas dam, and is intended to minimize the on-site work required to connect coaxial cables to the repeater and to downsize the area around the repeater. It is.

FIG. 1 is an exploded view showing a conventional relay device with a gas dam. Reference numeral 1 denotes a relay device housing, in which a relay device 2 is built. The cables C ₁ and C ₂ made of coaxial cables are connected via a repeater 2. For this purpose, in addition to the repeater housing 1 equipped with the repeater 2, two left and right sets of gas dam units 4 with stub cables 3 are prepared, and while the gas dam units 4 are attached to the housing 1 on-site, Connect the core wire 51 at the inner end of the cable 3 to the connector 6
and connect it to terminal 7 of repeater 2. Further, the main cable C ₁ and the stub cable 3 are connected to each other, and the main cable C ₂ and the stub cable 3 are connected at connecting portions 81 and 82, respectively. The connecting parts 81 and 82 connect the core wires 52 and 52 of the stub cable 3 and the core wires 91 and 92 of the main cables C ₁ and C ₂ , respectively, and also connect the casings 101a and 1 to prevent gas from leaking to the outside.
01b, the casings 102a and 102b are connected and sealed, respectively. In other words, the present cables C ₁ and C ₂ and stub cables 3 and 3, which are made up of coaxial cables, fill the space between each core wire and the inner layer tube outside thereof with gas to prevent moisture from entering the coaxial cable. In addition to preventing this, the leakage of gas also makes it easier to find the location of the failure. To prevent this gas from leaking at the end of the cable, that is, at the connection between the relay device and the stub cable 3, gas dam units 4, 4 are provided to prevent the stub cable 3 from leaking.
The terminal ends of the wires are sealed, and only the core wires 51, 51 are drawn out from the sealed portion. Also, the connection part 8
Casings 101a and 101 in 1,82
b. It is necessary to make the joint between the casings 102a and 102b an airtight structure, and also to make the sealing structure between the casing 101a and the main cable _C1 and between the casing 101b and the stub cable 3. The same applies between the casing on the left side of the figure and the main cable C ₂ and the stub cable 3.

The repeater housing 1 containing the repeater 2 and the gas dam units 4, 4 with stub cables are manufactured at the factory, and the gas dam units 4, 4 are installed on the relay equipment housing 1 on-site, and the core wires 51, 51 to the repeater 2, and the stub cables 3, 3 and the main cables C ₁ , C ₂ must be airtightly connected at two locations on the left and right. However, since coaxial lines are laid over long distances and repeaters are often installed in locations with inconvenient transportation, it is desirable to reduce the work at the installation site as much as possible. In addition, it is necessary to make the device as compact as possible in consideration of transportation of equipment and non-essential items, integration into a manhole, and mechanical strength.

On the other hand, as described in Japanese Utility Model Publication No. 56-2511, the core wire of the coaxial cable is connected to the gas dam on-site and covered with a storage pipe, and the storage pipe is inserted into the bottom of the repeater housing with the protector attached. It is proposed to insert and store the In this structure, the storage tube that houses the connection part is built into the case, so it is easier to remove the stub cable and the core wire connection part from outside the case than in the structure shown in Figure 1, where the stub cable and wire connection part are exposed outside the case. The part that protrudes from the top is made smaller. However, since the parts that were conventionally located outside the casing are housed inside the casing, the casing ends up becoming larger, and the overall size cannot be expected to be reduced.

In particular, it is necessary to insert the gas dam into the housing on-site and finally connect the repeater unit and the gas dam. Therefore, when inspecting or repairing the signal line connection in the storage pipe, it is necessary to remove the gas dam from the repeater housing and open the connection.
It is necessary to remove the signal line between the gas dam and the repeater unit in advance, which causes the problem of the line being interrupted. Storage pipes are heavy items, so
The workability of storing inside the housing is poor. Furthermore, when inserting the gas dam or the storage pipe into the housing, there is a risk that foreign matter may enter the housing or damage the core wire inside the housing.

The purpose of this invention is to solve these conventional problems, to enable the gas dam to be integrated into the repeater housing in advance, to reduce the burden of on-site work, and to make it possible to downsize the repeater as a whole. There is a particular thing.

As shown in FIG. 3, a gas dam 11 through which the core wire 14 connected to the core wire 32 of the main coaxial cable C ₁ passes through in an airtight structure is built into the relay device housing 1 in advance, and attached to the side wall of the housing. The core wire 32 of the main cable C ₁ made of the above-mentioned coaxial cable and the core wire 14 of the gas dam section 11 are directly connected, and a cylindrical protector hermetically seals and mechanically protects the connection. 12 over the core wire connection part,
Also, one end of the protector is airtightly fixed to the outside of the side wall of the relay device housing 1, covering the gas dam attachment part, and the inner layer tube 25 from which the outer skin of the cable _C1 has been removed is attached to the other end of the protector 12. The cable holder 28 was inserted over the sealed portion, one end of the cable holder 28 was fixed to the protector 12, and the outer sheath 31 of the cable was inserted into the other end and supported. It has a configuration characterized by the following.

Next, an embodiment of a relay device with a gas dam according to the present invention will be described. Fig. 2 is a partial cross-sectional side view showing the entire structure of the relay device with a gas dam, and Fig. 3 is a cross-sectional view showing one of the gas dams. As in Fig. 1, 1 is the relay device housing, and 2 is the casing of the relay device. The built-in repeaters, C ₁ and C ₂ , are main cables consisting of coaxial cables. Reference numeral 11 denotes a gas dam, which is fixed to the device housing 1 in advance at the factory. 12 is a cylindrical protector, in which the core wires inserted into the gas dam and the core wires of the main cables C ₁ and C ₂ are connected, and the main cables C ₁ and C ₂ are connected through this protector. It is mechanically supported by the device housing 1 and hermetically sealed.

As shown in FIG. 3, the gas dam 11 is inserted into a mounting hole 18 made in the side wall of the device housing 1,
It is fixed to the device housing 1 with bolts 20 with a sealing member 19 such as an O-ring in between. The above configuration is assembled in advance at a factory.

In the case of the present invention, the core wire 14 inserted into the gas dam 11 is connected to the main cable at the connection part 21 without passing through the stub cable as in the conventional case.
It is directly connected to the core wire 32 of _C1 . Main cable C ₁
To prevent gas from leaking from this connection to the outside,
The protector 12 provides airtight sealing and mechanical protection. The protector 12 has a cylindrical shape, and one end thereof is connected to a sealing member 2 such as an O-ring.
3, and is attached and fixed to the device housing 1 with bolts 24. A cylindrical portion 26 having an inner diameter slightly larger than the outer diameter of the inner tube 25 of the cable C ₁ is formed at the other end of the protector 12, into which the inner tube 25 of the cable C ₁ is inserted. Moreover, the space between the inner layer tube 25 and the cylindrical portion 26 is hermetically sealed with adhesive, solder 27, or the like.
It further includes a cylindrical cable holder 28,
With the cylindrical portion 26 of the protector inserted into the opening at the left end, they are fixed to each other with screws 29 or the like. The inner diameter of the holder 30 on the right side of this cable holder 28 is approximately the same as or slightly larger than the outer diameter of the outer sheath 31 of this cable _C1 .
The outer sheath 31 of the cable C ₁ is inserted through the cable C 1 . Note that the protector 12 and the cable holder 28 are made of thick steel or the like so as to have sufficient mechanical strength. In addition, the outer sheath 31 of this cable C ₁ is also designed to maintain mechanical strength and corrosion resistance.
Lead skin etc. are used.

At the installation site for this cable C ₁ , the outer sheath 31 and inner tube 25 of this cable C ₁ are peeled off to expose the core wire 32, and then only the outer sheath 31 is peeled off to expose the inner tube 25, and then the cable holder is installed. 28 and protector 12, this cable
Insert the end of C ₁ . After the core wire 32 of the main cable C ₁ and the core wire 14 inserted through the gas dam 11 are connected at the connecting portion 21, the protector 12 is fixed to the device housing 1 with bolts 24. Next, connect this cable C ₁ to the cylindrical part 26 at the right end of the protector 12.
When the inner tube 25 is inserted through the inner tube 25, the solder 27 forms an airtight seal between the cylindrical portion 26 and the inner tube 25. Finally, cable holder 28
is placed over the cylindrical portion 26 of the protector and fixed with screws 29, and the outer cover 31 of the cable _C1 is held firmly with the holder 30. In the figure, only the right side of the relay device housing 1 has been described, but the same applies to the left side.

According to this configuration, this cable C ₁ , C ₂
The gas filled between the inner tube 25 and the core wire 32 fills the protector 12, but the space between the gas dam 11 and the device housing 1 is sealed by a sealing member 19. In addition, the inner tube 2 of this cable C ₁ and C ₂
5 and the cylindrical portion 26 of the protector are sealed with solder 27. Therefore, the gas inside the protector 12 is completely hermetically sealed to prevent it from leaking to the outside.
Further, the outer sheath 31 of the cables C ₁ and C ₂ is inserted into the holder 30 of the cable holder 28 and fixed, so the cables C ₁ and C ₂ are connected to the device via the cable holder 28 and the protector 12. It will be fixed to the housing 1.

As is clear from the illustrated embodiment, according to the present invention, a gas dam through which only the core wire of the coaxial cable penetrates in an airtight structure is fixed in advance to the relay device housing, and at the site, the gas dam is made of coaxial cable. Directly connect the core wire of this cable to the core wire of the gas dam part, attach and fix the protector to the equipment housing, create an airtight seal between this cable and the protector, and insert the outer sheath of this cable into the cable holder. Just stick with it. In particular, the wiring connection between the core wire passing through the gas dam and the terminals of the repeater can be completed at the factory. Therefore, on-site work can be reduced, and connection between the relay device and this cable becomes extremely simple. In addition, the gas dam is built into the relay device housing, and there is no need for stub cables or connection casings as in conventional systems, making the relay device smaller and easier to transport to the site.In addition, the relay device can be built into the manhole. It is also convenient when doing so. The area around the relay device is small and there is no stub cable or connection casing, so even if the relay device is not built into a manhole and is buried directly under the road, the weight of vehicles passing on the road will cause the area around the relay device to move. There is no fear of damage. Furthermore, since both the gas dam and the cable connection protector are attached and fixed to the casing, the strength of the gas dam and protector is high, and since only the protector and cable holder protrude from the casing, the overall Miniaturization is achieved. When inspecting and repairing the coaxial cable connection on-site,
Since the connection between the gas dam and repeater unit can remain connected, the line will not be interrupted. Since there is no need to insert a heavy storage tube into the housing on site, the work is easy and there is no fear of foreign matter getting into the housing or damage to the core wire.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional side view showing a conventional coaxial cable relay device, Figure 2 is a partial cross-sectional side view showing the entire coaxial cable relay device according to the present invention, and Figure 3 is a connection between the relay device and this cable. FIG. 3 is an enlarged sectional view showing details of the portion. In the figure, 1 is a repeater housing, 2 is a repeater,
C ₁ and C ₂ are the main cables, 11 is the gas dam, 12 is the protector, 14 and 32 are the core wires, 21 is the connection part,
25 is an inner layer tube, 26 is a cylindrical part, 27 is solder, 28 is a cable holder, 30 is a holder, 31
is the outer skin.

Claims (1)

[Claims for Utility Model Registration] A gas dam 11 through which the core wire 14 connected to the core wire 32 of the coaxial cable main line C ₁ penetrates in an airtight structure,
It is built in advance into the relay device housing 1 and hermetically fixed to the side wall of the housing, and the core wire 32 of the main cable C ₁ made of the above coaxial cable is directly connected to the core wire 14 of the gas dam section 11. A cylindrical protector 12 that hermetically seals and mechanically protects the connection portion is placed over the core wire connection portion,
And one end of the protector 12 is connected to the relay device housing 1.
Covering and airtightly fixing the gas dam attachment part to the outside of the side wall of the protector 12; Inserting the inner tube 25 from which the outer skin of the cable _C1 has been removed into the other end of the protector 12, and sealing the space between the cable holders. 28 is placed over the seal portion, one end of the cable holder 28 is fixed to the protector 12, and the outer skin portion 31 of the main cable is inserted into the other end and supported.