JPH05251233A - Lead connection part of levitation guide coil and insulation thereof - Google Patents

Abstract

PURPOSE:To contrive the uniformity of the insulation properties of the lead connection part of a levitation guide coil by a method wherein a coil lead terminal part is clamped to a transition cable terminal part to form a lead connection terminal part and after an insulating spacer is inserted between transition cables, the lead connection terminal part is coated integrally with a heat-shrinkable insulating tube and the whole connection part is heated and is made to shrink. CONSTITUTION:A lead terminal part 2 of a levitation guide coil and a transition cable terminal part, which is branched in two directions, are integrally formed, and thereafter, an insulating spacer 8 coated with a fusion-bonding agent is inserted between transition cables 6a and 6b on both side surfaces of a tail formed into a recessed form along the covering outer diameters of the cables 6a and 6b. Then, a heat-shrinkable insulating tube 7, whose inner periphery is coated with a bonding agent of a heat-fusion welding property, is inserted from the sides of the cables 6a and 6b and the whole lead connection part, which is formed after the coil lead connection terminal part 2 is coated integrally with the tube 7, is heated and is made to shrink in its insulating direction. Thereby, the adhesion of the cables to the spacer and the adhesion of the cables to the tube are improved and the uniformity of the insulation properties and long-term reliability of the lead connection part can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-out connection portion of a levitation guide coil used in a magnetic levitation railway and an insulating method therefor.

[0002]

2. Description of the Related Art Generally, a magnetic levitation railway is provided with a superconducting coil on the upper side of a car, a propulsion coil and a levitation guide coil on the ground side.

The structure of the levitation guide coil according to the present invention will be described with reference to FIG. FIG. 5 is a configuration diagram of the levitation guide coil. The levitation guide coil is formed by electrically connecting two unit coils 9 wound in a rectangular shape by an eight-character connection, and further arranging these two unit coils 9 as one set and arranging the two sets side by side to form a unit-shaped coil 9. , And is formed by molding the whole into a predetermined shape with an insulating resin.

The levitation guide coil is installed inside the propulsion coils installed on the left and right inner side walls of the track. At this time, the levitation guide coils that face each other on the left and right are null-flux-connected by the crossover cable 6a connected to the lead-out connecting portion to maintain the left-right balance in the guiding direction of the traveling vehicle. Null flux connection is the four lead connection parts a, b, c,
Among the three lead connections d, three lead connection portions a, b, and d are provided between the lead connection portions facing each other on the left and right. The inner lead-out connection portion b has crossover cables 6a and 6b branched in two directions, one crossover cable 6a is null-flux-connected, and the other crossover cable 6b is connected to the lead-out connection portion c. Here, the levitation guide coil, like the propulsion coil, is subjected to mechanical vibrational stress such as electromagnetic vibration and wind pressure when the vehicle passes, and environmental stress such as humidity and dust or high-voltage induced voltage when exposed outdoors. Since electrical stress is constantly applied due to, safety and reliable insulation are desired. Particularly, in the lead-out connection portion b having the crossover cables 6a and 6b branched in two directions, the two crossover cables 6a and 6b are close to each other,
A high degree of insulation is required between the transition cables 6a and 6b.

Next, the lead-out connection portion having the crossover cables 6a and 6b branched in two directions of the conventional levitation guide coil and its insulating method will be described. The lead-out connection part is a lead-out terminal part, a crossover cable terminal part, and a lead-out connection terminal part composed of bolts for fastening the two, a heat-shrinkable tube made of synthetic rubber or plastic covering all of them, and two crossovers. It is made of a flexible filler filled in the lower gap between the cables 6a and 6b.

The work of attaching the crossover cable to the coil lead-out terminal portion is performed after the levitation guide coil is attached to the side wall of the track. First, the heat-shrinkable tube is inserted into the cable side in advance, and the coil lead-out terminal portion and the crossover cable terminal portion are fastened with bolts. After that, the heat-shrinkable tube is tucked up to integrally cover the lead-out connection terminal portion and heat-shrink the tube. After that, a flexible filler is filled in the gap on the lower side between the two connecting cables 6a and 6b of the lead-out connection terminal portion and cured to complete the insulation of the lead-out connection portion.

[0007]

However, in the above-described lead-out connection portion of the conventional levitation guide coil, the cable installation work is performed after the levitation guide coil is attached to the side wall of the track, so that there is a great obstacle to space. Therefore, it is difficult to sufficiently fill the gap between the cables with the filler. Therefore, it is difficult to confirm the filling property and ensure the uniformity of the filler, and there is a problem of the insulating property of the filler. In addition, since the filling operation of the filler is performed after the heat shrink of the heat shrinkable tube, the cable does not receive the effect of pressing the shrink force of the tube, and the adhesive force between the filler and the heat shrink tube and the crossover cable coating is increased. It is weak and causes the filler to fall off due to mechanical vibrational stress when the vehicle passes through. In addition, since it takes a certain amount of time for the filler to harden, dripping voids are created due to its own weight, and moisture, moisture, or dust that intrudes through the gaps causes a decrease in insulation performance due to a creeping leak. In other words, it is difficult to confirm the insulating property of the filler because there is a restriction on the work of attaching the cable to the lead-out connection portion of the levitation guide coil, and the heat shrinkage force of the heat shrinkable tube does not reach the filler. There are drawbacks in that the adhesive strength with the cable becomes weak, the filler drops off, and a gap is created between the cable and the insulation performance between the transition cables.

Therefore, in order to eliminate the above-mentioned drawbacks, the present invention makes the workability of the connecting portion easy and has a uniform and dense structure in view of the restrictions of the cable mounting work, and the long-term insulation reliability is ensured. It is an object of the present invention to provide a lead-out connection portion of a floating guide coil and a method of insulating the same.

[0009]

In order to achieve the above object, according to the present invention, in a lead-out connection terminal portion of a levitation guide coil having a crossover cable branched in two directions, the crossover cable is inserted between the crossover cables. Insulating spacers that have concave-shaped both sides along the outer diameter of the coating, and are coated with heat-sealable adhesive on both sides and the lead-out connection terminal part are integrally coated, and the inner periphery is heat-sealed. And a heat-shrinkable insulating tube formed by applying a conductive adhesive.

Further, the insulation method is such that the lead-out terminal portion of the levitation guide coil and the transition cable terminal portion branched in two directions are integrated with each other, and heat is applied to both side surfaces of the post-transmission cable having a concave shape along the outer diameter of the coating. Insert an insulating spacer coated with a fusible adhesive between the cables, and insert a heat-shrinkable insulating tube coated with a heat-fusible adhesive on the inner circumference from the cable side to connect the coil outlet connection terminal. It is characterized in that the entire lead-out connection portion formed by integrally covering the portion is heat-shrinked.

[0011]

In the lead-out connection portion of the levitation guide coil having the above-mentioned configuration, the insulating spacer is inserted between the two connecting cables connected to the coil lead-out terminal portion, and the rear lead-out terminal and the outer periphery of the two connecting cables are provided. Cover with heat-shrinkable insulation tube. As a result, the insulating property is made uniform by using the insulating spacer together with the workability.

Further, in the method of insulating the lead-out connection portion, the lead-out connection terminal portion is formed by fastening the coil lead-out terminal portion and the crossover cable terminal portion, and after inserting an insulating spacer between the crossover cables, they are integrated with a heat-shrinkable insulating tube. Cover and heat shrink the entire connection.

With this, at the same time as the contraction of the tube, the heat-fusible adhesive applied to both side surfaces of the insulating spacer and the inner circumference of the tube are melted and integrated with each other, resulting in a lead-out connection portion insulating structure having no gap.

[0014]

Embodiments of the present invention will be described in detail with reference to FIG. FIG. 1 is a sectional view of an embodiment of a lead-out connection portion of a levitation guide coil according to the present invention.

In FIG. 1, the coil lead-out terminal portion provided below the levitation guide coil is composed of an SMC mold portion 1 made of unsaturated polyester resin and a metal lead-out terminal plate. With the metal lead-out terminal plate 2 in the middle, the crimp terminals 5 attached to the tips of the two connecting cables 6a and 6b are sandwiched from both sides. The metal lead-out terminal plate 2 and the two crimp terminals 5 are fastened with a predetermined torque via bolts 3 and nuts 4. These insulating structures cover the area from the coil lead-out terminal to the vicinity of the connecting portions of the crossover cables 6a and 6b with a heat-shrinkable insulation tube, and further, between the two crossover cables from the end of the heat-shrinkable insulation tube on the other side. It is formed by sandwiching the insulating spacer 8. Here, the configurations of the heat-shrinkable insulating tube 7 and the insulating spacer 8 will be described with reference to FIGS. 2 and 3. 2 is a plan view (a) and a sectional view (b) of the heat-shrinkable insulating tube used in FIG. 1, and FIG. 3 is a sectional view of the insulating spacer used in FIG.

As shown in FIG. 2, the heat-shrinkable insulating tube 7 has an olefin heat-shrinkable tube 22 whose inner diameter heat-shrinks to 1/3 or less of the original temperature at a temperature of 80 ° C. or higher, and heat-shrinks at 80 ° C. inside thereof. The heat-fusible adhesive 23 is applied in a thickness of 0.02 to 0.2 mm.

As shown in FIG. 3, the insulating spacer 8 has an insulating body 31 made of a rubber-like elastic system having recesses on both side surfaces, the depressions having a shape along the outer diameter of the coating of the crossover cable 6. On both sides of the recess of the elastic insulator 31, the same product as the heat-sealable adhesive 23 applied to the inner circumference of the heat-shrinkable insulating tube 7 is used for 0.02 to 0.
2 mm applied. The insulating work of the lead-out connection portion of the levitation guide coil having such a configuration will be described.

The metal lead-out terminal plate 2 of the coil lead-out terminal portion of the levitation guide coil is sandwiched with the crimp terminal 5 attached to the tips of the two connecting cables 6a and 6b in the middle.
Then, the metal lead-out terminal plate 2 and the crimp terminal 5 are fastened with a predetermined torque via the bolt 3 and the nut 4, and the lead-out connection terminal portion of the levitation guide coil is integrated.

Next, before the heat-shrinkable insulating tube 7 is heat-shrinked, an insulating spacer 8 is provided between the two crossover cables 6 from the end of the heat-shrinkable insulating tube 7 on the opposite exit side, and the recesses on both side surfaces are crossed over the cable 6a, Insert along 6b.

Thereafter, the heat-shrinkable insulating tube 7 previously inserted from the side of the transition cables 6a and 6b is pulled up to the coil lead-out terminal portion, and the lead-out connection terminal portion and the transition cables 6a and 6b are integrally covered.

Then, by a hot air generator such as a dryer
Hot air of 80 ° C. or higher is blown to heat-shrink until the heat-shrinkable insulating tube 7 has a predetermined shape. At this time, since the insulating constituent portion of the connecting portion is heated at 80 ° C. or higher, the heat-sealable adhesive 23 applied to the inner circumference of the heat-shrinkable insulating tube 7 and both side surfaces of the insulating spacer 8 is thermally fused. To be done.

As a result, in the present embodiment, the same heat-fusible adhesive 23 is applied to the inner circumference of the heat-shrinkable insulating tube 7 and both side surfaces of the insulating spacer 8 so that they are heat-fused and integrated under the same conditions. As it is made more compact, the voids in the details are also denser, and it is possible to prevent the ingress of dust and moisture and ensure the insulation. Since the insulating spacer 8 is inserted between the two crossover cables 6a and 6b before the heat-shrinkable tube 7 is shrunk, the compressive force of the heat-shrinkable insulating tube 7 causes the insulating spacer 8 to cross over. Since the adhesive strength with the cables 6a and 6b is improved, it is possible to prevent the insulating spacer 8 from falling off or missing due to mechanical vibration stress when the train runs. Therefore, it becomes possible to improve the insulation performance between the cables. Furthermore, on both sides of the insulating spacer 8,
By previously providing a recess having a shape along the outer diameter of the coating of the crossover cables 6a, 6b, the crossover cables 6a, 6b
Since it can be easily inserted between b, the work for insulating the lead-out connection portion can be simplified and simplified, and the insulation property can be confirmed and the uniformity can be improved.

Further, the insulating spacer 8 and the crossover cable 6
As shown in FIG. 4, the insulation resistance does not decrease with time at 40 ° C.-95% RH heating and humidification because the adhesive strength between a and 6b is improved and voids are eliminated. It appears. Curve A in the figure
Is an insulation method according to the present invention, and curve B is a conventional insulation method. That is, in the conventional insulation method, the insulation resistance begins to show a tendency to decrease after 100 hours have passed, whereas in the insulation method according to the present invention, the initial resistance value does not change with time and the good insulation characteristics are continuously maintained. Can be said.

[0024]

As described above, according to the present invention,
The lead-out connection terminal portion of the levitation guide coil having a crossover cable branched in two directions has recessed side surfaces along the transitional cable coating outer diameter between the crossover cables. Insulation spacers are applied and the inner circumference is covered with a heat-shrinkable insulating tube coated with a heat-sealable adhesive to cover the entire lead-out connection terminal portion, and the entire lead-out connection portion is thermally fused. As a result, the adhesiveness between the crossover cable and the insulating spacer and between the crossover cable and the insulating tube is improved, and the uniformity of the insulating property and the long-term reliability are improved. In addition, it is possible to improve the enforceability within a limited range.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a lead-out connection portion of a levitation guide coil according to the present invention.

FIG. 2 is a plan view (a) and a cross-sectional view (b) of a heat-shrinkable insulating tube used in the present invention.

FIG. 3 is a cross-sectional view of an insulating spacer used in the present invention.

FIG. 4 is a characteristic diagram of the insulation structure of the present invention and the conventional insulation structure according to changes with time of insulation resistance value under 40 ° C.-95% RH heating and humidification conditions.

FIG. 5 is a configuration diagram of a levitation guide coil.

[Explanation of symbols]

 1 ... SMC mold part 2 ... Metal lead-out terminal part 3 ... Bolt 4 ... Nut 5 ... Crimp terminal 6a, 6b ... Crossover cable 7 ... Heat-shrinkable insulating tube 8 ... Insulation spacer 22 ... Olefin heat-shrinkable tube 23 ... Heat fusion Adhesive 31 ... Elastic insulator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Isao Onodera No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory inside

Claims (2)

[Claims] 1. A lead-out terminal portion of a levitation guide coil, a transition cable terminal portion branched in two directions, and a recessed shape inserted along the outer diameter of the transition cable, which is inserted between the transition cables, on both side surfaces. Insulating spacers having both sides coated with a heat-fusible adhesive, the lead-out terminal portion, the crossover cable terminal portion, and the insulating spacers are integrally covered, and the heat-fusible adhesive is applied to the inner circumference. A lead-out connection portion of a levitation guide coil, which comprises a heat-shrinkable insulating tube coated with a chemical. 2. A step of forming a lead-out connection terminal portion by integrating a lead-out terminal portion of a levitation guide coil and a transition cable terminal portion branched in two directions, and a concave shape along the outer diameter of the covering of the transition cable. And a step of inserting an insulating spacer formed by applying a heat-sealable adhesive on both side surfaces between the crossover cables, and applying the heat-sealable adhesive on the inner circumference. A step of inserting a heat-shrinkable insulating tube from the crossover cable side to integrally cover the lead-out connecting terminal portion and the insulating spacer, and heating the lead-out connecting terminal portion after mounting the heat-shrinkable insulating tube and the insulating spacer. A method of insulating a lead-out connection portion of a levitation guide coil, which comprises a step of contracting.