JPS6124896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cable connection portion, and more particularly to an improvement in the sealing structure between an end block that closes a cable penetration portion into a cable connection case and a cable connection case.

In conventional cable connections of this type, sealing between the end block and the cable connection case was achieved by fitting an O-ring around the outer periphery of the end block.

However, using O-rings has the disadvantage that O-rings of various sizes must be prepared because the outer diameter of the end block changes as the size of the connecting portion changes.

An object of the present invention is to provide a cable connection part that can be easily sealed even if the end blocks have different sizes.

Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings. In the cable connection section of this example,
As shown in FIG. 1, the cable 1 is introduced into the connection case 3 by passing between the two end blocks 2, 2 in an airtight and liquidtight manner. As shown in FIGS. 2 to 4, each end block 2 is a molded product made of plastic or the like, and consists of two thick rings.
It has a split shape, and a sealing groove 4 and a tightening material fitting groove 5 are formed in the circumferential direction on its outer periphery. Both end blocks 2, 2 are fitted onto the outer periphery of the cable 1 via a sealing material, and the tightening material 6, which is fitted into the respective tightening material fitting grooves 5, 5 of the end blocks 2, 2, 6 to bolt 7,
7 and a nut (not shown) for mechanical integration and sealing. Inside the connection case 3, a core connection portion 8 is provided that connects each core wire of the cable 1 to each other. A pair of sheath retaining plates 9,9 (the one on the back side is not shown) are attached to the bolts 10, 6A, 6A of the fastening members 6, 6, respectively, in a direction transverse to the cable 1.
10 and nuts (not shown), and the cable 1 is passed between these sheath retaining plates 9,9. The sheath of the cable 1 is fixed and retained on the sheath retention plates 9, 9 by a bolt 11 passing through the sheath of the cable 1 and the sheath retention plates 9, 9, and a nut 12 screwed onto the bolt 11. There is.

On the other side of the connection case 3, although not shown, the two halves of the end block are similarly tightened together by a pair of tightening members, and the sheath of the cable 1 is held back by a pair of sheath retention plates. There is.

The end block 2,
2 (the other side is not shown) are interconnected by a tension member 13.

In order to surround the core connection part 8, a connection case 3 is divided into two and extends over both end blocks 2, 2.
The split surfaces of both connection cases 3 are butted together with a gasket (or sealing material) 14 interposed therebetween, and a band 15 wound on the outside is tightened and sealed in an airtight and liquidtight manner.

The outer periphery of the end blocks 2, 2 and the connection case 3,
3 is sealed with two composite seal strings 16, 16 disposed in the sealing grooves 4, 4 of the end blocks 2, 2. As shown in FIG. 5, this composite seal string 16 has a structure in which a viscous outer layer 16b such as an unvulcanized or less vulcanized rubber-like material is provided around the outer circumference of an elastic inner layer 16a made of an elastic material such as rubber. It's summery. Two such composite seal strings 16 are prepared with a length equal to the circumferential length of the sealing grooves 4, 4, and these two composite seal strings 16, 16 are attached to the paired end blocks 2, 2. The seams 16c, 16c of each composite seal string 16, 16 are shifted in position in the circumferential direction as shown in FIG.

When the composite seal strings 16, 16 are arranged in this way and the band 15 is used to tighten the connection boxes 3, 3, the viscous outer layer 16b is compressed and deformed, and the gap between the sealing grooves 4, 4 and the facing portions of the connection cases 3, 3 is compressed and deformed. fill the gap between
In addition, the elastic inner layer 16a is compressed, and a resilient force is generated to return to the original state, resulting in an energized state. Therefore, internal pressure is constantly applied to the viscous outer layer 16b from the elastic inner layer 16a, and a good sealing state can always be maintained. In addition, each composite seal string 16,1
Since the joints 16c and 16c of No. 6 are shifted in position in the circumferential direction, the seal will not be broken.

In the above embodiment, a split end block is used, but the end block may be integrally molded around the outer periphery of the cable sheath.

As explained above, the cable connection part according to the present invention uses a string-like sealing material instead of a ring-shaped sealant to seal between the end block and the connection case, so The length can be freely selected according to the diameter, and there is no need to prepare O-rings of various diameters as in the past. In particular, in the present invention, a composite sealing string having a viscous outer layer on the outer periphery of an elastic inner layer is used as a sealing material, so in a compressed state, the viscous outer layer deforms and fills the gap between the parts to be sealed, and the elastic inner layer is compressed. An elastic force is generated to return to the original state, and the elastic inner layer constantly applies internal pressure to the adhesive outer layer, thereby making it possible to maintain a good sealing state at all times. Furthermore, even if the sealing material is in the form of a string, since a plurality of strings are used and the joints of each string are shifted in the circumferential direction, the seal will not be broken at the seams even if the sealant is a string.

[Brief explanation of the drawing]

FIG. 1 is a left half vertical sectional view showing an embodiment of the cable connection part according to the present invention, FIGS. 2 and 3 are a plan view and a front view of the end block used in this embodiment, and FIG. The figure is a right side view of Fig. 3, Fig. 5 is an enlarged cross-sectional view of the composite seal string used in this example, and Fig. 6 is the seam of the two composite seal strings used in this example. It is a top view showing the positional relationship of. 1...Cable, 2...End block, 3...
... Connection case, 4 ... Seal groove, 8 ... Core connection part, 15 ... Band, 16 ... Composite sealing string, 16a ... Elastic inner layer, 16b ... Viscous outer layer.

Claims (1)

[Claims] 1 The penetration part of the cable into the connection case is
In a cable connection portion that is closed by an end block attached to the outer periphery of the cable, and a sealing material is used between the end block and the connection case, a viscous outer layer is provided on the outer periphery of the elastic inner layer as the sealant. A composite seal string having a plurality of threads is wound around the outer periphery of the end block and is in a compressed state between the end block and the connection case, and the seams of each of the composite seal strings are A cable connection portion characterized by being shifted in position in the circumferential direction.