JPS5838733Y2 - Support part of fireproof wire connection body - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of the support part of a fireproof electric wire connection body.

In general, fire-resistant electric wires have a fire-resistant layer 2 formed on a conductor 1, an insulator 3 made of polyethylene, etc. on top of the fire-resistant layer 2, and a sheath made of vinyl etc. on these wire cores, which are parallel or twisted together, as shown in Figure 1. 4 has been applied.

However, when connecting fireproof wires to levers, the wires 5 to be connected are stripped in stages as shown in FIG.
are exposed, and then the conductors are electrically connected to each other by crimp connectors 7.

Thereafter, a fireproof tape 8, for example, is wound in three layers around the outer periphery of the conductor connection portion, and then a self-fusing tape 9 and an adhesive vinyl tape 10 are further wound thereon.

However, in such a connection method, as shown in FIG. joint box 11
Rock wool 12 to prevent them from coming into contact with each other.
etc., the on-site connection process is complicated and takes a long time.

Further, there are other disadvantages such as the fire resistance and electrical characteristics of the connection portion being dependent on the operator who wraps the tape.

On the other hand, in order to solve the above-mentioned drawbacks, a device has recently been developed in which the core connection part is inserted into the porcelain plancher body instead of the metal box, the lid is closed, and this is secured with screws. In such cases, it is necessary to form screw insertion holes in each of the porcelain plancha body and the lid, which is troublesome to manufacture and requires time and effort to tighten and secure. .

Furthermore, the fireproof wire connection body is left unfixed on the ceiling or the like, which is an undesirable inconvenience in terms of safety.

The present invention was developed with attention to these points, and it is possible to easily connect the fireproof case body and the lid without forming screw insertion holes, and also to safely attach the connecting body to structures such as ceilings. It is an object of the present invention to provide a support portion for a fireproof electric wire connection body that can be supported.

The present invention will be explained below based on the drawings of one embodiment.

In FIGS. 4A, B, and C, for example, a fireproof case body 15 made of steatite or high alumina porcelain material with an open top surface 13 and one end 14 has a core storage groove 16 and a slightly larger conductor connection portion. At least one storage groove 17 is formed in each case.

The material of the case body is preferably a high alumina porcelain material that has good rapid heat resistance properties, that is, good thermal shock properties.

The number of grooves 16 and 17 formed corresponds to the number of core connections of the refractory electric wire.

That is, in the case of a single core, one groove is provided, and in the case of a plurality of cores, the number of grooves corresponding to the number of grooves is provided.

FIG. 5 shows the case of two cores.

Thus, the wire core connection portion 19 of the refractory electric wire 18 is housed in the refractory case main body 15 from above.

Connection of the refractory electric wire 18 is made by sequentially peeling off the sheath, insulator, and refractory layer to expose the conductor 20, and electrically connecting the conductor 20 to each other using a compression connector 21 or the like.

In this case, it is desirable to fit a pull-out prevention device 22 made of, for example, an iron washer or the like of the refractory layer onto the insulated wire core before crimping the conductors together.

This removal prevention tool 22 is for preventing the insulated wire core 23 from being burnt out in the event of a fire and the connecting portion 19 from being displaced from the fireproof case body 15.

Reference numeral 24 shown in FIGS. 6A, B, and C is a fireproof cover made of steatite, high alumina porcelain, etc., and a fireproof spacer 25 made of a convex strip or the like is provided approximately in the center thereof.

In this case, the case body 15 is provided with grooves 26 at positions corresponding to the protrusions.

This fireproof spacer 25 is intended to prevent a short circuit between the conductor connections in the event of a fire, and is usually not very effective.

In other words, this is to prevent gas generated in the event of a fire from becoming semiconductive.

27 indicates a stopper. This stopper restricts excessive insertion of the fire-resistant wire connection portion, thereby improving the fire resistance of the connection portion.

In other words, if the wire sheath is accidentally inserted too far into the case body, if it burns, a large amount of conductive chlorine gas will be generated, making it easier to short circuit, so this limits the wire insertion position. .

The case body 15 and the cover 24 are tightened and fixed in the following manner by a pair of clamping pieces 28 and 28' shown in FIG.

The clamping pieces 28, 28' are provided with a hook part 29, 29' at one end and a fastening part 30, 30' at the other end, and are symmetrically formed as shown in the figure.

Reference numeral 31 shown in FIG. 8 indicates a fixture fixed to a hanging tool 33 such as a hanging bolt suspended from a structure 32 such as a ceiling, and the hook portion 29.29 of the clamping piece 28.28'
' is hooked into a locking hole 34 provided in the fixture.

Thus, the fireproof wire connection body 35 is held between the pair of clamping pieces 28.28.
', insert a bolt (not shown) into the pre-formed bolt insertion hole 36, and tighten it with a nut.

It is desirable that the fire-resistant electric wire connector 35 be fixed with the wire insertion hole side of the case body facing downward in order to prevent dust from entering.

As described above, in the present invention, the conductor joints of the fireproof electric wires connected outside the fireproof case body are housed inside the fireproof case body, and then a fireproof cover is placed to cover the entirety of these joints. Since this is tightened with a pair of clamping pieces and fixed to the hanging tool, the connection work time is shortened compared to conventional methods, and individual differences in connection work are also eliminated, making it possible to always provide stable connections for fireproof wires. .

In addition, in the present invention, the conductor connection part is covered with a fireproof member made of high alumina porcelain material, so a metal joint box is not required as in the past. There is no need for tape winding work such as adhesive tape or vinyl tape or filling work such as rock wool, and the complexity of conductor connection processing is eliminated.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a fire-resistant electric wire, Figures 2 and 3 are longitudinal cross-sectional views of a conventional fire-resistant electric wire connection, and Figures 4 A, B, and C are top views of the fire-resistant case body, respectively, and A-A. 5 is an explanatory view of the wire core connection part of the fire-resistant electric wire in the present invention, and FIG. 6A is a sectional view and a front view taken along the line. B and C are a rear view, a sectional view taken along the line B-B', and a front view of the fireproof cover, respectively, FIG. 7 is a side view of the clamping piece, and FIG. 8 is a perspective view showing the support part of the fireproof wire connection body. And 15.
... Fireproof case body, 16 ... Wire core storage groove, 17 ... Conductor connection storage groove, 18 ...
... Fireproof electric wire, 19 ... Wire core connection part, 20.
...Conductor, 21...Crimp connector, 22.
...Dull-out prevention device, 23...Insulated wire core, 2
4... Fireproof cover, 25... Fireproof spacer, 27... Stopper, 28.28'
・・・・・・Holding piece, 29.29'・・・Hook part,
30°30'... Fastening part, 31... Fixing tool, 32... Structure, 33... Hanging tool, 34... Locking hole, 35... Connection body, 36... Insertion hole is shown.

Claims (1)

[Scope of utility model registration request] 1. A fireproof wire connection body that stores a wire core connection part of a fireproof wire in a fireproof case body and covers this with a fireproof lid, a hanging device hanging from a structure such as a ceiling, and a hanging device fixed to the hanging device, It consists of a fixture provided with a locking hole, and a pair of symmetrically formed clamping pieces each having a hook part at one end and a fastening part at the other end, and each hook part of the clamping piece is inserted into the locking hole of the fixture. The hook is fastened, and the connecting body of the fireproof electric wire is held between a pair of clamping pieces, and a bolt is inserted into the through hole formed in the clamping part of the pair of clamping pieces to tighten the clamping part. A support part for a fireproof electric wire connection body, characterized in that it is made by tightening. 2. The support part for a fire-resistant electric wire connection body according to claim 1, wherein the fire-resistant case body and the lid are made of high alumina porcelain material.