JP5479963B2 - Refractory wire terminal connection storage cap - Google Patents

Description

  The present invention relates to a terminal connection portion storage cap for a refractory wire used for protecting the connection portion of the refractory wire from high heat during a fire or the like.

  In order to satisfy the fire resistance performance in the terminal connections of fireproof wires used as electrical wiring for disaster prevention facilities such as buildings and underground shopping centers, (i) fireproof tape such as mica tape is wrapped over the terminal connections of fireproof wires. (Ii) Measures are taken such as inserting and fixing a terminal connecting portion (crimp sleeve) into a cap made of a refractory material (ceramic) (see, for example, Patent Document 1). The latter is fixed by screwing the crimp sleeve into the fire cap or by locking the crimp sleeve with a stop wire.

  However, the method (i) of winding the fireproof tape is troublesome and has a problem that the fireproof performance tends to vary. On the other hand, the method (ii) using the fireproof cap has a problem that the fireproof cap is made of ceramic, so that it is vulnerable to impact and the weight increases. In addition, in the case where the crimping sleeve is fixed to the fireproof cap by screwing, it takes time to screw and the outer shape of the crimping sleeve itself is deformed when the crimping sleeve is crimped to the end of the electric wire. Therefore, there is a problem that it is impossible to screw into the fireproof cap. Moreover, in the case of fixing by a stop wire, once the crimp sleeve is fixed in the fireproof cap, it cannot be easily removed thereafter, and there is a possibility that reconnection will be hindered.

Japanese Utility Model Publication No. 53-12587

  The present invention has been made in response to the above-described problems of the prior art, has stable fire resistance without variation, and can reliably protect the connection portion of the stored fire resistant wire from high heat during a fire or the like. An object of the present invention is to provide a terminal connecting portion storage cap for a refractory wire that can be easily removed even after being attached once.

To achieve the above object, the invention described in claim 1, a cap for housing the terminal connection portion of the refractory wire, has an open end and a closed end, the terminal connection of the refractory wire from said open end parts are inserted, and the cap body comprising a soft mica from the tubular body formed integrally with the adhesive, are equipped to the cap body, engaging to lock the terminal connecting portion of the refractory wire into the cap body A stopper member having a stop portion, and the locking portion of the stopper member is opposite to the opening end from the inner peripheral surface side of the cap body with respect to a surface orthogonal to the insertion direction of the connection portion of the refractory wire. projecting with 7 degrees 15 degrees inclination direction, have a protruding piece of the at least three pieces consisting of a stainless steel plate 0.2mm or more thickness 0.1 mm, projecting pieces in the circumferential direction of the cap body Almost equal There is provided at intervals, the Rukoto by elastic deformation of the projecting piece is configured as a terminal connecting portion of the refractory wire is inserted into the space of the closed end closer than the projecting piece of the cap body It is the terminal connection part storage cap of the fireproof electric wire characterized by the above.

According to a second aspect of the present invention, in the terminal connection portion storage cap of the refractory wire according to the first aspect , the protruding piece is made of a stainless steel plate having a thickness of 0.1 mm or more and 0.15 mm or less. Is.

The invention described in claim 3 is the fireproof electric wire terminal connection portion storage cap according to claim 1 or 2 , wherein the cap body is formed by mixing soft mica and an adhesive, followed by heat and pressure molding. It consists of the cylindrical body made.

According to a fourth aspect of the present invention, in the terminal connecting portion storage cap for a refractory wire according to any one of the first to third aspects, the opening end is sealed with a moisture-proof material. .

  According to the terminal connection part storage cap of the fireproof electric wire of the present invention, a connection part having stable fire resistance without variation can be easily formed, and can be easily removed from the connection part even after being attached once. .

It is sectional drawing which shows the terminal connection part storage cap of the refractory wire which concerns on one Embodiment of this invention. It is a top view which shows the protrusion piece in the storage cap shown in FIG. It is a top view which shows the protrusion piece in the storage cap shown in FIG. It is a figure explaining the removal | desorption method with respect to the terminal connection part of the fireproof electric wire of the storage cap shown in FIG. It is sectional drawing which shows an example of the use condition of the storage cap shown in FIG. It is sectional drawing which shows the modification of the use condition of the storage cap shown in FIG. It is a perspective view which shows an example of the refractory wire in which the storage cap of this invention is used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing one embodiment of a terminal connecting portion storage cap for a refractory wire according to the present invention.

  As shown in FIG. 1, a terminal connection part storage cap (hereinafter also simply referred to as a storage cap) 10 of a refractory wire according to this embodiment has a cylindrical shape in which one end is an open end 11a and the other end is a closed end 11b. A cap body 11 made of soft mica is provided. The cap body 11 is formed with a hollow housing portion 12 for housing a connection terminal such as a crimp sleeve that constitutes a terminal connection portion of the refractory wire.

  The cap body 11 is formed by mixing soft mica and an adhesive, filling the mixture into a mold, and heating and pressing to integrate. The cap body 11 can also be formed by molding with soft mica and then impregnating with an adhesive by a known method. As the adhesive, conventionally known adhesives for soft mica, such as alumina, silica, and zirconia / silica, are used. The cap body 11 has, for example, an outer diameter of 11 mm to 24 mm, a height of 30 mm to 40 mm, and a thickness of 0.5 mm to 2 mm.

  Although not shown in the drawings, the cap body 11 is not limited to a cylindrical shape, and may be a rectangular tube having a polygonal cross section, a semicylindrical shape having a semicircular cross section, or a hollow cone. The outer diameter may be gradually reduced from the open end 11a side to the closed end 11b side, such as a shape or a hollow pyramid shape. In short, as long as the terminal connection portion of the refractory wire has an open end 11a into which the end connection portion can be inserted and the hollow connection portion 12 can accommodate the terminal connection portion of the refractory wire inserted through the opening end 11a. Good.

  The hollow portion 12 of the cap body 11 is internally provided with a stopper member 15 having a cylindrical portion 13 that fits into the hollow portion 12 and a locking portion 14 provided on the inner peripheral surface thereof. One end of the cylindrical portion 13 reaches the vicinity of the closed end 11 b of the cap body 11. Further, as shown in FIG. 2, the locking portion 14 has a plurality of (three in the example of the drawing) protruding pieces 16, 16 protruding from the inner peripheral surface of the cylindrical portion 13 toward the center portion. . FIG. 2 is a view of these protruding pieces 16 as viewed from the opening end 11a side of the cap body 11, and a plurality of protruding pieces 16 are provided at substantially equal intervals in the circumferential direction. Each protruding piece 16 is arranged such that an angle θ with respect to a plane orthogonal to the insertion direction A of the connecting portion of the refractory electric wire is 5 degrees or more and 20 degrees or less, preferably 10 degrees or more and 15 degrees or less.

  And the cylindrical part 13 and the latching | locking part 14 of the stopper member 15 are formed with the stainless steel plate, Among these, the protrusion piece 16 of the latching | locking part 14 is thickness 0.1 mm or more and 0.2 mm or less, Preferably It is formed of a stainless steel plate having a thickness of 0.1 mm to 0.15 mm, such as SUS304 (austenite), SUS420 (martensite), or the like.

  In the example of the drawing, three protruding pieces are provided, but two or four or more may be provided. Moreover, as shown in FIG. 3, the structure which connected the base part of the adjacent protrusion piece 16 may be sufficient. In this case, the base part of the connection part 16a and the protrusion piece 16 may have an inclination, and does not need to have it.

  In mounting the storage cap 10 configured in this way on the connection portion of the refractory wire, first, as shown in FIG. 4A, the connection terminals 21 mounted on the ends of the plurality of refractory wires 20 and 20 are connected. The cap body 11 is inserted into the hollow portion 12 from the open end 11a. When the tip of the connecting terminal 21 reaches the protruding piece 16, the connecting terminal 21 is inserted further into the back, that is, toward the closed end 11b so as to push up the protruding piece 16. Since the protruding piece 16 has elasticity, it is pressed to the closed end 11b side, and the gap at the center expands to a size that allows the connection terminal 21 to be inserted, and after the connection terminal 21 has passed, it returns to the original center. The state returns to a state where a gap of a size that the connection terminal 21 cannot be inserted is formed. Thereby, the connection terminal 21 attached to the end of the refractory wire 20 is locked in the cap body 11. That is, the terminal connection part accommodation cap 10 of a refractory wire is attached to the terminal connection part of the refractory wire 20. FIG. 4B is a diagram showing a state in which the connection terminal 21 is passing through because the gap at the center of the protruding piece 16 is expanded by the insertion of the connection terminal 21. FIG. 4C shows that after the connection terminal 21 passes, the protruding piece 16 returns to the original state in which a gap having a size in which the connection terminal 21 cannot be inserted is formed at the center. It is the figure which showed the state latched in the cap main body 11. FIG.

  Normally, in this state, that is, in the state shown in FIG. 4C, the connection terminal 21 of the refractory wire 20 does not fall out of the cap body 11, and the terminal connection portion of the refractory wire 20 is the terminal connection portion storage cap 10 of the refractory wire. Protected by. When the storage cap 10 needs to be removed during reconnection or the like, as shown in FIG. 4D, when the connection terminal 21 is pulled in the direction B opposite to the insertion direction A, the protruding piece 16 is It is pulled to the opening end 11a side by the elasticity, and the gap at the center is expanded to a size that allows the connection terminal 21 to be inserted, and the connection terminal 21 can be pulled out. That is, the storage cap 10 can be removed from the terminal connection portion of the refractory wire 20. After the connection terminal 21 passes through the central gap, the protruding piece 16 returns to the original state where a gap of a size that the connection terminal 21 cannot be inserted is formed at the center as shown in FIG. .

  Thus, the terminal connection part accommodation cap 10 of the fireproof electric wire of this embodiment only inserts the terminal connection part (connection terminal 21) of the fireproof electric wire 20 from the opening end 11a, and pushes it toward the closed end 11b. And when the storage cap 10 needs to be removed, it can be easily removed simply by pulling out the terminal connection portion (connection terminal 21).

  Moreover, in the terminal connection part storage cap 10 of the fireproof electric wire of this embodiment, since the cap main body 11 is made of soft mica, it is lightweight, has excellent impact resistance, and can have stable fireproof performance without variation, The terminal connection part of the accommodated fireproof electric wire 20 can be reliably protected from high heat such as during a fire.

  In the present embodiment, in order to improve moisture resistance, when installing the terminal connection portion storage cap of the refractory wire, the opening end 11a of the cap body 11 is sealed with the moisture-proof material 22 as shown in FIG. It may be. As the moisture-proof material, for example, it is preferable to use a moisture-proof compound having excellent heat resistance such as butyl rubber / chloroprene rubber, silicone rubber, silicone resin, and epoxy resin.

  The terminal connection part accommodation cap 10 of the fireproof electric wire of this embodiment is used, for example, as shown in FIG. 6 by being attached to the terminal connection part (connection terminal 21) of the fireproof electric wire 20 in a metal connection box 60. The FIG. 6 shows an example in which a round exposure box is used as the connection box 60.

As shown in FIG. 7, the storage cap 10 according to the present embodiment collects one or more wire cores each having a refractory layer 32 and an insulator layer 33 on a conductor 31, and the outer periphery thereof is made of heat-resistant polyethylene or the like. Although it can be widely used for storing terminal connection portions of various refractory wires known in the art, such as those coated with a sheath 34, among others, the outer diameter is 1.2 mm or more and less than 2 mm, or the cross-sectional area is 1.25 mm ^2. It is particularly suitable for housing a terminal connection portion of a single-core to four-core refractory wire having a conductor of 8 mm ² or more.

  Next, experiments conducted to confirm the effects of the present invention and the results thereof will be described.

(Experiment 1)
First, the experiment which evaluates the fire resistance of the terminal connection part storage cap of the fireproof electric wire of this embodiment was conducted. In this experiment, the terminal connection part accommodation cap 10 of the refractory wire shown in FIG. 1 in which the inclination angle θ of the protruding piece 16 was 10 degrees was produced. The materials and sizes used for the cap body 11 and the stopper member 15 are as follows.
Cap body: outer diameter 23 mm, height 40 mm, wall thickness 0.65 m;
Soft mica + silicone resin adhesive Stopper member: SUS304 plate with a thickness of 0.1 mm

Insert a connection terminal attached to the end of three conductor fire-resistant wires with a conductor cross-sectional area of 5.5 mm ² into this storage cap, engage it with the engaging part 14, and conduct a fire resistance test based on the Fire Department Notification No. 10 (840 ° C. for 30 minutes) (No. 1 to 3). For comparison, a similar fire resistance test was performed on the terminal connection portion in which mica tape was wound around the outer periphery in five layers with a ½ wrap instead of the storage cap 10 (Nos. 4 to 6). The results are shown in Table 1.

  As is clear from Table 1, both the insulation resistance and the dielectric strength satisfied the standards stipulated in Notification No. 10 of the Fire and Disaster Management Agency, but there were variations in the characteristics when the conventional mica tape was wound. It was.

(Experiment 2)
Next, the terminal holding force and reworkability of the terminal connection portion storage cap 10 of the refractory wire when the inclination angle θ of the protruding piece 16 is changed (the refractory wire without changing the shape of the protruding piece 16 of the stopper member 15). An experiment was conducted to evaluate whether or not it is possible to withdraw.

In this experiment, the terminal connection part accommodation cap 10 of the fireproof electric wire shown in FIG. 1 in which the inclination angle θ of the protruding piece 16 is 5, 7, 10, 15 or 20 degrees was produced. For comparison, a fireproof wire terminal connection portion storage cap having the same configuration as that shown in FIG. 1 was prepared except that the inclination angle θ of the protruding piece 16 was set to 1, 25, 35, or 40 degrees. The materials and sizes used for the cap body 11 and the stopper member 15 are as follows.
Cap body: outer diameter 23 mm, height 40 mm, wall thickness 0.65 m;
Soft mica + silicone resin adhesive Stopper member: SUS304 plate with a thickness of 0.1 mm

Inserted into each of these storage caps is a connection terminal attached to the end of a three-conductor fire-resistant electric wire having a conductor cross-sectional area of 5.5 mm ² , locked by a locking portion, and then pulled out from the storage cap. The operation was repeated, and the terminal holding force and reworkability were evaluated according to the following criteria (Nos. 7 to 15). The results are shown in Table 2.
Terminal holding force: ○ Pulling force 10N or more
△ Pulling force 5N or more and less than 10N
× Pulling force less than 5N Reworkability: ○ Pulling out 3 times or more
△ Pull out once or twice
× Unable to pull out

  As is clear from Table 2, when the inclination angle θ of the protruding piece 16 is 5 degrees or more and 20 degrees or less, both the terminal holding force and the reworkability are good at a practical level, and the inclination angle θ of the protruding piece 16 is good. When the angle was 7 degrees or more and 15 degrees or less, particularly good characteristics were obtained. On the other hand, when the inclination angle θ of the protruding piece 16 is less than 5 degrees or more than 20 degrees, either the terminal holding force or the reworkability is poor. From these results, in order to obtain good terminal holding force and reworkability, the inclination angle θ of the protruding piece 16 needs to be 5 degrees or more and 20 degrees or less, and more preferably 7 degrees or more and 15 degrees or less. It was confirmed that it was preferable.

(Experiment 3)
Next, the terminal holding force and reworkability of the terminal connection portion storage cap of the refractory wire when the thickness of the protruding piece 16 is changed (the refractory wire is pulled out without changing the shape of the protruding piece 16 of the stopper member 15). An experiment was conducted to evaluate that it is possible.

In this experiment, the terminal connection part accommodation cap 10 of the refractory wire shown in FIG. 1 in which the thickness of the protruding piece 16 was 0.10, 0.15, or 0.20 was produced. For comparison, a terminal connecting portion storage cap for a refractory wire having the same configuration as that shown in FIG. 1 except that the thickness of the protruding piece 16 is 0.05, 0.07, or 0.30 mm was produced. . The materials and sizes used for the cap body 11 and the stopper member 15 are as follows.
Cap body: outer diameter 23 mm, height 40 mm, wall thickness 0.65 m;
Soft mica + silicone resin adhesive Stopper member: Tilt angle θ 7 or 10 degrees of protruding piece

Inserted into each of these storage caps is a connection terminal attached to the end of a three-conductor fire-resistant electric wire having a conductor cross-sectional area of 5.5 mm ² , locked by a locking portion, and then pulled out from the storage cap. The operation was repeated, and the terminal holding force and reworkability were evaluated according to the same criteria as in Experiment 2 (Nos. 16 to 27). The results are shown in Tables 3 and 4.

  As is clear from Tables 3 and 4, when the thickness of the protruding piece 16 was not less than 0.10 mm and not more than 0.20 mm, both the terminal holding force and reworkability were good. On the other hand, when the thickness of the protruding piece 16 is less than 0.10 mm or more than 0.20 degrees, either the terminal holding force or the reworkability is poor. From these results, it was confirmed that the thickness of the protruding piece 16 was required to be 0.10 mm or more and 0.20 mm or less in order to obtain good terminal holding force and reworkability.

(Experiment 4)
Next, the experiment which evaluates the moisture resistance of the terminal connection part storage cap of the fireproof electric wire of this embodiment at the time of using a moisture-proof material was conducted. In this experiment, the terminal connection part accommodation cap 10 of the fireproof electric wire shown in FIG.

After inserting the connection terminal attached to the end of the three-conductor fire-resistant electric wire having a conductor cross-sectional area of 5.5 mm ² into this storage cap and inserting the connection terminal into the storage cap, More moisture-proof material was filled up to the base of the protruding piece 16. As the moisture-proof material, a mixed rubber of butyl rubber and chloroprene rubber (mixing mass ratio 1: 1) was used.

  After this, the connecting terminal portion with the storage cap was immersed in water at room temperature, and after 5 minutes, 30 minutes and 60 minutes, the presence or absence of water immersion in the storage cap was confirmed. Was not recognized.

  For comparison, a similar water immersion experiment was performed on a terminal connection portion in which five layers of mica tape were wound on the outer periphery in place of the storage cap, and water immersion was already confirmed after 5 minutes.

  From these results, it was confirmed that according to the storage cap of the present embodiment, moisture resistance can be easily imparted.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this example. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are of course within the technical scope of the present invention. Is done.

  DESCRIPTION OF SYMBOLS 10 ... Terminal connection part storage cap of a fireproof electric wire, 11 ... Cap main body, 11a ... Open end, 14 ... Locking part, 15 ... Stopper member, 16 ... Projection piece, 20 ... Fireproof electric wire, 21 ... Connection terminal, 22 ... Moisture-proof Wood.

Claims (4)

A cap for storing the terminal connection part of the refractory wire,
Has an open end and a closed end, a terminal connecting portion of the refractory wire from the open end is inserted, a cap body made of a cylindrical body formed by integrating a soft mica with an adhesive, is furnished to the cap body A stopper member having a locking portion for locking the terminal connection portion of the refractory wire in the cap body,
The stopper portion of the stopper member has an inclination of not less than 7 degrees and not more than 15 degrees from the inner peripheral surface side of the cap body to a direction orthogonal to the insertion direction of the connection portion of the refractory wire in the direction opposite to the opening end. projecting with a, have a protruding piece of the at least three pieces consisting of a stainless steel plate thickness of 0.1mm or more 0.2 mm, projecting piece is provided at approximately equal intervals in the circumferential direction of the cap body , the terminal connecting portion of the refractory wire characterized that you have been configured to the terminal connecting portion of the refractory wire by the elastic deformation of the projecting piece is inserted into the space closed end nearer than the protruding piece of the cap body Storage cap. The projecting piece, the terminal connecting portion housing cap of the refractory wire according to claim 1, characterized in that it consists of the following stainless steel 0.15mm thickness greater than 0.1 mm. 3. The cap terminal housing portion cap for a refractory wire according to claim 1 or 2 , wherein the cap body is formed of a cylindrical body formed by mixing soft mica and an adhesive and heating and pressing. . The terminal connection part accommodation cap of the refractory wire according to any one of claims 1 to 3 , wherein the opening end is sealed with a moisture-proof material.

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