JPH0717225Y2 - Sealing end plate - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cable lead-in / out portion of a cable connection box used for maintaining airtightness at a place where cables such as a communication cable and an optical fiber cable are connected. The present invention relates to a sealing end face plate provided as.

[Conventional technology]

Generally, communication cables, optical fiber cables, etc. laid in caverns and underground pipes are always supplied with dry air because there is a risk that they will be exposed to water immersion or high humidity environment for a long time. .

Therefore, the cable connection box that contains the core wire connection portion at the connection point of the cable has a structure that can maintain airtightness, but this cable connection box is made of rubber or plastic that contains the cable core wire connection portion. A sleeve is located, and sealing end plates made of elastic material are attached to both ends of the sleeve.
There is a sealing material formed by winding a rubber adhesive tape around the fitting part between the sleeve and the sealing end plate and between the sealing end plate and the cable. Due to the characteristics, the sealing material is sandwiched by two sealing washers for one cable, and the sealing washer is held by the outer peripheral groove portion of the fitting insertion hole of the sealing end face plate.

In particular, the sealing end face plate is located between the cable side and the sleeve side, and in order to maintain airtightness, the center part has a fitting insertion hole large enough to press the sealing material against the cable, and the outer peripheral wall part presses the sleeve and internal pressure. It has a shape that does not flow.

[Problems to be solved by the device]

However, since this sealing end plate is made of rubber, it must have a certain thickness to withstand the internal pressure (for example, 0.65 kgf / cm ² ), and if it is too thick, it will take a long time to descend during vulcanization molding, resulting in high cost. On the other hand, many bolts are tightened during assembly and mounting, resulting in poor work efficiency.Because it is made of rubber and has no rigidity, it is difficult to obtain the cable holding force due to this bolt tightening.
If the number of bolts is increased in order to obtain a holding force, there is a problem in workability.In addition, when conducting from the cable sheath, connecting work with conductive wires is also required. In addition to the need, in order to increase the tightening force, if gripping metal fittings are used in accordance with the cable jacket and connection form, the number of parts will increase and a large number of various members will be formed in advance for cable connection work. If one is applied, handling is complicated including selection, and workability is poor and it is extremely inconvenient, and in particular, ground work such as overhead line is often required to have simple workability, which is a problem.

In the present invention, these conventional drawbacks are properly eliminated, and it is possible to reduce the tightening force, obtain sufficient cable holding force and have excellent airtight characteristics, reduce the number of parts and improve the efficiency of the internal volume. The purpose of the invention is to provide a sealing end face plate that is easy to handle and has a small amount of change in compression due to temperature changes, significantly improves reliability, and is easy to work with and can easily be conducted from a cable. It was done.

[Means for Solving the Problems]

The present invention is a sealing end face plate that has a cable insertion hole 1 and that is fitted and arranged in an end opening of a sleeve 9 that covers a cable C and that closes the end opening of the sleeve 9. inner comprising a cylindrical portion 3 inner defining an outer cylindrical portion 2 ₅ and the cable insertion hole 1, a recess that opens in the sleeve 9 by the inner cylinder portion and the outer cylindrical portion 2 ₅ defined for case 2 _1, at least the with cable insertion holes 1 center is divided into at least two butt coupling can be in the bonding surface 2 ₃ through by molding in aluminum die-casting, at least the outer tubular portion of the divided inner casing 2 ₁ 2 ₅ and the inner cylindrical portion 3 inside surface integrally molded resilient material 2 ₂ rubber or elastic resin, to form a mounting hole 5 of Shimezukeko 4 for bonding the inner cylinder portion 3 of the split inner case 2 ₁ , The inner case A sealing end face plate, characterized in that a ground terminal 6 to be connected to the scan 2 ₁ removably at least one split outer surface of the inner case 2 _1.

[Action]

In the sealing end face plate 2 of _the present invention, split inner case
The end face plate (divided end face plate) integrally formed with the elastic material 2 ₂ on 2 ₁ is fitted into the cable C at the cable fitting hole 1 at the cable connection point after the connection work, and the butt joint faces 2 ₃ are aligned from above and below. After the fastener 4 is screwed into the mounting hole 5 in the inner tubular portion 3 to integrally fasten it, and the cable C is fastened with the holding metal fitting 8 as necessary, the upper and lower sleeves 9 and 9 are attached to the outer tubular portion of the end face plate 2. Fitting the part ₂₅ , covering it, and tightening it with the tightening metal fittings ensures the airtightness of the cable connection box, and the cable insertion hole 1,1
Gas leakage between them is prevented, it can withstand the pressure of the enclosed gas and the water pressure in the manhole, and the fluctuation of the compression amount due to temperature changes is small, airtightness can be easily secured, it can be used safely, the tightening force is reduced and the number of parts The reduction and efficiency of the internal volume can be achieved, and the reliability and workability can be greatly improved.

〔Example〕

Referring to FIGS. 1 to 8, an embodiment of the present invention will be described. In a split sealing end face plate provided with a cable fitting hole 1 and arranged on an end face of a sleeve for covering a cable C, for example, a sleeve 9 made of glass fiber reinforced plastic, As shown in FIGS. 1 to 3, an outer cylinder portion ₂₅ fitted in the sleeve 9 and a boss portion (inner cylinder portion) constituting the cable fitting hole 1
An inner case 2 ₁ having a concave portion S extending in the sleeve 9 and extending to the sleeve 9 side surface is butt-joined at a joint surface 2 ₃ passing through the center of the cable fitting hole 1 2
One division is divided into inner case 2 _1, to mold these split inner case 2 ₁ aluminum die casting. Then, integrally molded resilient material 2 ₂ of the divided comprises inner case 2 ₁ of the outer cylindrical portion 2 ₅ the outer surface and the boss portion 3 inner surface continuous surface rubber or synthetic resin (outer surface), the divided inner casing
2 ₁ of the mounting hole 5 of Shimezukeko 4 for respectively joined to the boss portion 3 so as to form opposite coaxially, each divided inner casing 2 ₁ grounding terminal 6 connected detachably to the end plate 2
Is a sealing end face plate that is provided on the side surface of the cable and is adapted to obtain conduction from the cable sheath.

In this case, as shown in FIGS. 4 to 6, an uneven strip 7 is provided on the inner circumference of the boss portion 3 as a ring strip so that the sealing washer 11 wound around the cable C and the rubber tape 12 to the sealing tape 13 can be press-fitted. Is done.

Incidentally, the inner case 2 ₁ has an outer cylindrical portion 2 _5, there is extending into the inner surface of the end plate 2, an elastic material 2 ₂ ethylene propylene rubber on the outer surface of the end plates Te has become a composite end sheet, or a core material buried inner case 2 ₁ in the elastic material 2 _2, may be a sandwich structure, better efficiency of the tightening torque as in the seventh and eighth Figure However, the contact pressure with respect to the cable C and the sleeve 9 is made appropriate so that the internal pressure becomes 1 kgf / cm ² or more and the airtightness can be maintained sufficiently. In particular, since the coefficient of thermal expansion of aluminum is 2.3 × 10 ^−5, it is very close to the coefficient of thermal expansion of the main sleeve 9 and the fluctuation of the compression amount with respect to temperature changes can be suppressed. However, it is slim and reliable.

As the elastic material 2 _2, for molding around the inner case 2 _1, chloroprene rubber, styrene rubber, ethylene propylene rubber or other synthetic resin is used, excellent weather resistance, such as ozone resistance properties good to use things, ensure the surface accuracy to compress the rubber tape and the sealing material to be incorporated in the cable C side and the sleeve 9 side is easy airtight by the outer periphery elastic material 2 ₂ a resilient force High performance can be maintained.

Also as the inner casing 2 _one of the volume of the end plates is often the proportion by volume ratio, it is effective to change a small airtight secured amount of compression to the temperature change, the elastic material 2 ₂ thick molded into the end plate outer periphery Although the cost advantage that a be as thin as possible, and in consideration of the airtightness sea between the inner casing 2 ₁ and the sleeve 9 of the shaped, for example 5mm or more thick must be 8mm or more look safety factor Good to do.

Further since the thickness of the inner case 2 ₁ that is heard after the forming of the manufacturing process an elastic material, it is friendly to withstand the molding pressure, preferably provided with ribs 10 suitably secure the strength needed.

In the figure, 11 is a sealing washer, 12 is a rubber tape, 13 is a sealing tape, and 14 is an end face plate sealing material and is joined to a recess formed in a ring shape on the outer periphery of the end face plate. Reference numeral 15 is a sleeve fastening band, which is detachably attached to the outer circumference of the sleeve 9 for use. Reference numeral 16 is a conductive wire, and 17 is a protective sheet material. Reference numeral 18 is a bolt having a claw that bites the cable jacket, and is screwed to the end face plate 2 or the holding metal fitting 8 so as to be capable of centering and supporting the cable C. Reference numeral 19 is an enclosed gas supply port.

It should be noted that the end face plate 2 can be selected to receive a plurality of insertion holes 1 of different diameters or the same diameter for the cable C, or to provide one at the center portion.

In the example of FIG. 9, a sealing end plate 2 having a cable fitting hole 1 as a central hole is used.

[Effect of device]

The present invention relates to a sealing end face plate having a cable insertion hole, which is inserted into an end opening of a sleeve for covering a cable and closes the end opening of the sleeve. And an inner case having an inner tubular portion defining a cable insertion hole, and a concave portion that opens into the sleeve defined by the inner tubular portion and the outer tubular portion is butt-coupled at a joint surface passing at least the center of the cable insertion hole. Divide into at least two separate inner cases as much as possible, and mold these separate inner cases by die casting of aluminum, and at the same time, at least the outer cylinder part outer surface and the inner cylinder part inner surface of each separate inner case is made of a rubber or elastic resin elastic material. After forming, a mounting hole for a binding fastener is formed in the inner cylindrical portion of each of the divided inner cases, and at the same time, it is connected to the inner case. Since the terminal is detachably provided on the outer surface of at least one of the divided inner cases, the end surface plate has excellent airtightness due to the rigidity of the inner case and the elasticity of the elastic material. It is easy to secure the surface accuracy when compressing the tape or sealing material to be installed in, and the airtight performance can be maintained extremely high, there is no bulge against the internal pressure, the tightening torque is made more efficient, and the number of tightening bolts is also increased. It can be greatly reduced, the cable holding force by bolt tightening can be easily obtained and the workability is good, and the ground terminal such as the bond wire becomes a conductor with the inner case and conducts through the cable grip to easily obtain the continuity from the cable sheath. Sufficient holding power is obtained and excellent airtightness is achieved, the number of parts is reduced and the internal volume is made more efficient, and the fluctuation of the compression amount due to temperature change is also small. In addition, the reliability is significantly improved, the work is simple, the conduction from the cable sheath is easily obtained, and the sealing end face plate that is easy to handle can be easily manufactured, and gas leakage between the cable end face plates is prevented. It can withstand the sealed gas pressure and water pressure in the manhole, has little fluctuation in compression amount due to temperature changes, can be easily kept airtight, and can be used safely, reducing tightening force, reducing the number of parts, and improving internal volume efficiency. The peeling, reliability and workability can be greatly improved.

[Brief description of drawings]

Fig. 1 is a rear view, Fig. 2 is a side view, Fig. 3 is the main men's,
4 is an enlarged vertical sectional view taken along the line I-I of FIG. 1, FIG. 5 is an enlarged vertical sectional view taken along the line II-II of FIG. 3, and FIG. 6 is FIG. 1 III.
-III is an enlarged cross-sectional view, FIG. 7 is a partially cut side view of the usage state, FIG. 8 is a cross-sectional view of the IV-IV line of FIG. 7, and FIG. 9 is a perspective view of another usage state. is there. 1 ... Cable insertion hole, 2 ... End plate, 2 ₁ ... Inner case (split inner case), 2 ₂ ... Elastic material, 2 ₅ ... Outer cylinder part,
3 ... Boss part (inner cylinder part), 4 ... Clamp, 5 ... Mounting hole, 6 ...
Ground terminal, 7 ... uneven strip, 8 ... gripping metal, 9 ... sleeve, C ... cable.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masato Hirata 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Mitsuyoshi Katsuse 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corp. (72) Inventor Ichijo Yubara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp. (72) Tadashi Hattori 2-14-40 Tsuruse, Fujimi-shi, Saitama Prefecture Issue Castle Megère Tsuruse 411 (72) Creator Toshihiro Yamamoto 2-19-3 Fujimi, Tsurugashima, Iruma-gun, Saitama 106 106 (72) Creator Koji Koshiyama 3-29-10 Mihara, Asaka City, Saitama 111 The Shishi 111 (72) Inventor Shinji Minejima 498, Kashiwazaki, Higashimatsuyama City, Saitama Prefecture (56) References JP-A-61-221508 (JP, A) JP-A-47-15697 (JP, A)

Claims (2)

[Scope of utility model registration request] 1. A sealing end face plate which is provided with a cable fitting hole 1 and which is fitted and arranged in an end opening of a sleeve 9 for covering the cable C and which closes the end opening of the sleeve 9, and is fitted in the sleeve 9. comprising a cylindrical portion 3 inner defining an outer cylindrical portion 2 ₅ and the cable insertion hole 1, if a recess that opens in the sleeve 9 is defined by the inner cylinder portion 3 and the outer cylindrical portion 2 ₅ that the inner case 2 _1, the cable insertion holes 1 centered butt couplable with joining surfaces 2 ₃ through at least 2
Thereby forming an aluminum die casting is divided into One, the elastic material 2 ₂ rubber or elastic resin on one surface including the outer cylindrical portion 2 ₅ outer and inner cylindrical portion 3 inside surface of each of the divided inner casing 2 ₁
The integrally molded, the inner cylindrical portion 3 of the split inner case 2 ₁
And wherein to form a mounting hole 5 of Shimezukeko 4 for joining, that the ground terminal 6 connected to the inner case 2 ₁ detachably provided on at least one split outer surface of the inner case 2 ₁ Sealing end plate. Wherein said divided inner case 2 _first sealing end face plate according to claim 1, wherein the inner circumferentially inner cylinder portion 3 with a concave-convex 7 in a ring-shaped.