JPS5825717Y2 - Disassembly and reconnection type oil stop connection box - Google Patents

Description

[Detailed description of the invention] This invention relates to a disassembly and reconnection type oil stop joint box using a stop tube.

In order to facilitate the cable attachment/detachment work at the connection portion of the OF cable, a disassembly and reconnection type oil stopper connection box has been used conventionally.

FIG. 1 shows this type of conventional oil stop joint box using a stop tube.

A drawback of the above-mentioned conventional connection box is that in order to disassemble the connection part in order to replace and connect the low oil pressure side cable, it is necessary to apply a freezing method to the high oil pressure side cable in advance to stop oil.

This difficulty makes the process of attaching and detaching cables extremely inefficient.

Therefore, first of all, to the extent necessary to understand the above problems,
The conventional example shown in FIG. 1 will be explained.

In the figure, 1 indicates a high oil pressure side cable, and 2 indicates a low oil pressure side cable.

The connection box includes an end copper pipe 3 connected to the high oil pressure side cable 1,
It is composed of an end copper pipe 4 connected to the low oil pressure side cable 2 and a central copper pipe 5 connected between the two.
．． 4 form a high oil pressure chamber 6 and a low oil pressure chamber 7, respectively, and the central copper pipe 5 forms a central chamber 8.

The high oil pressure chamber 6 and the central chamber 8 are connected by a connecting copper pipe 9, so that the oil pressures of the compartments are equal.

Note that, except for the connecting copper pipe 9, the other structures are symmetrical, so the following will mainly describe the structure on the high oil pressure chamber 6 side, that is, the left half.

A stop tube 10 made of porcelain is inserted from the high oil pressure chamber 6 to the inside of the central chamber 8.

One end of the stop tube 10 is supported by a tightening ring 12 on an end wall 11 of the central chamber 8 within the high hydraulic pressure chamber 6, and the end surface of the stop tube 10 is in contact with a locking ring 13.

The other end of the stop tube 10 is connected to the oil-immersed roll paper layer 1.
Supported by 4.

The core 15 of the high oil pressure side cable 1 is inserted into the above-mentioned stop tube 10, and the conductor pull-out rod 17, which is integrated with the cable conductor 16, is pulled out from the tip of the stop tube 10 while keeping it oil-tight, and inside the central chamber 8, The conductor pull-out rods 16 of each cable 1, 2 are connected by a copper plate 18.

In order to dismantle the connection box in order to reconnect the low oil pressure side cable 2 in such a state, the high oil pressure side cable 1 should be frozen and oil-tightened as described above, and then the high oil pressure side cable 1 should be connected to the high oil pressure chamber 6. It is necessary to remove the connecting copper pipe 9 between the central chambers 8 and dismantle the low oil pressure chamber 7 and the central chamber 8.

If disassembly is performed without applying such an oil stopper, the stop tube 10 will receive a force in the direction of pulling out due to the internal pressure of the stop tube 10.
A force is applied to the cable conductor 16 via the conductor pull-out rod 17 in a direction in which it extends.

However, due to its performance, the cable conductor 16 has a limitation in that it cannot apply a certain amount of force (for example, a force of 7 forces or more).

Further, since the frictional force between the cable core 15 and the aluminum sheath 19 is relatively small, if a force in the direction of extension is applied to the cable conductor 11, the insulation of the cable body may be damaged.

Due to the above-mentioned problems, in the conventional oil stop junction box, it was necessary to prevent the oil from freezing in advance, even though it was inefficient.

The object of this invention is to provide an oil stop connection box that can be disassembled and connected without stopping the oil, that is, while applying hydraulic pressure to the high hydraulic pressure chamber side.

Hereinafter, an example thereof will be described based on FIG. 2.

The difference between what is shown in Figure 2 and what was mentioned above in Figure 1 is that
Since these are only the support structure of the stop tube 10 and the structure of the connecting steel pipe 9, the same parts are shown with the same reference numerals, and the explanation of the overlapping parts will be omitted.

In the embodiment of the invention shown in FIG. 2, a flange 20 maintains an oil-tight state between the end copper tube 3 and the central copper tube 8.
The flange 20 separates the high hydraulic pressure chamber 6 from the central chamber 8.

A stop tube 10 is inserted through the cylindrical portion 22 of the flange 20, and the stop tube 10 is fitted with a gasket 23.
It is tightened by a ring 12 interposed therebetween.

The above-mentioned flange 20 and cylindrical portion 22 are connected to the high pressure chamber 6 and the central chamber 8.
The end wall 1 has the function of liquid-tightly partitioning the
1 (FIG. 1).

A cylindrical locking fitting 24 is fitted around the center chamber 8 side of the stop tube 10.

The distal end of this locking metal fitting 24 has a reduced diameter, and the reduced diameter portion is locked to a stepped portion 25 of the stop tube 10.

This stepped portion 25 is a stepped portion such that in the case of the high pressure side stop tube 10, the diameter is large on the high pressure chamber 6 side, and in the case of the low pressure side stop tube 10, the diameter is large on the low pressure chamber T side.

Seven mounting flange 26 are provided at the rear end of the locking fitting 24, and this flange 26 is fixed to the aforementioned flange 20 with bolts 21.

Note that it is desirable to provide a cushion layer 28 between the locking metal fitting 24 and the stop tube 10.

This cushion layer 28 prevents excessive thermal stress from acting on the stop tube 10 due to the difference in thermal expansion coefficient between the stop tube 10 and the locking fitting 24 when there is a temperature change.

Furthermore, providing a connecting copper pipe 9 between the high oil pressure chamber 6 and the central chamber 8 is the same as in the conventional case, but an oil stop valve 30 is provided at the connection part 29 on the high oil pressure chamber 6 side. is desirable.

This valve 30 has the effect of reducing oil outflow by blocking the connecting copper pipe 9 in advance when it is removed.

Other than that, the structure of the connection part of the cable conductor 11 is the same as that of the conventional one, 31 is a valve chamber, and 32 is a backing.

Note that although the illustrated case shows the case of an aluminum sheathed cable, the same applies to the case of a lead sheathed cable.

By the way, in the embodiment shown in FIG. 2, in order to replace and connect the low oil pressure side cable 2, if there is an oil stopper balloon 30, close it, and if there is no oil stopper balloon 30, close the connecting copper pipe 9 removed from the central chamber 8 side. After the ends are closed by appropriate means, the end copper pipe 4 and the central steel pipe 5 on the low oil pressure side are dismantled.

By disassembling these end copper tubes 4 and central copper tube 5, internal pressure acts on the stop tube 10 as described above, but this pressure is supported by the locking fitting 24 locked to the stop tube 10. , stop tube 10
is not pulled out, therefore, the cable conductor 1γ
There is no force acting in the direction of stretching.

Therefore, according to this invention, when dismantling the oil stop junction box and replacing and connecting one cable, it is possible to connect and disconnect the other cable by applying hydraulic pressure, which is much more efficient than conventional work. It has the effect of becoming

The embodiment of this invention also has the effect of preventing excessive thermal stress due to temperature changes from acting on the stop tube.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a partially omitted sectional view of an embodiment of this invention. 1... High oil pressure side cable, 2... Low oil pressure side cable, 3, 4... End copper pipe, 5...
...Central steel pipe, 6...High oil pressure chamber, 7...
・Low oil pressure chamber, 8... Central chamber, 9... Connecting steel pipe, 10... Stop tube, 16...
...Conductor pull-out rod, 17...Cable conductor,
20... Flange, 24... Locking metal fitting, 25... Step portion, 26... Flange,
28... Cushion layer, 30... Oil stopper balloon included

Claims (3)

[Scope of utility model registration request] (1) Connect the end copper pipes 3 and 4 to both sides of the central copper pipe 5, and connect the ends of each end copper pipe 3 and 4 to the cable sheath 19 in a fluid-tight manner, and The high-pressure side and low-pressure side stop tubes 10 are inserted into a junction box formed by
The cable conductor 17 is pulled out from the cable core 15 inserted into the cable core 15 by the pull-out rod 16 while maintaining liquid tightness, and the two pull-out rods 16 are connected to form a high hydraulic chamber 6, a central chamber 8, and a low hydraulic chamber 7. In an oil stop joint box in which the high oil pressure chamber 6 and the central chamber 8 are connected by a connecting pipe 9, a stepped portion 25 is formed in the middle of each of the stop tubes 10 so that the high oil pressure chamber 6 side or the low oil pressure chamber γ side has a larger diameter. , one end portion of the cylindrical locking metal fitting 24 having a reduced diameter is engaged with the stepped portion 25, and the cylindrical locking metal fitting 24 is engaged with the stepped portion 25.
A disassembly and reconnection type oil stop joint box characterized in that the other end is attached to the end wall 11 connected to the large diameter part of the stop tube 10. (2) The disassembly and reconnection type oil-stop connection box as set forth in claim (1), which is characterized in that a cushion layer 28 is provided between the locking fitting 24 and the stop tube 10. (3) The disassembly and reconnection type oil stopper connection box as set forth in claim (1) of the utility model registration, characterized in that the connection pipe 9 is provided with an oil stopper pulp 30.