JP3154154U - Cable connection structure - Google Patents

Abstract

The present invention provides a cable connection structure capable of easily and reliably performing a wire breaking operation in a short time. In a cable connection structure, crimp terminals 3 fixed to the ends of cables 1 and 2 are connected to each other by screw parts 4a and 4b, and an insulating wire member 8 is disposed in the longitudinal direction. An insulating material is wound on the surface. The insulating material is obtained by winding the varnish treatment tape 5, the self-bonding tape 6, and the insulating adhesive tape 7 in order. Further, the linear member 8 is made of an ultrahigh molecular weight polyethylene line, and both ends thereof are disposed in a state of protruding outward from the insulating material, and a ring 8a having a size to which a finger is placed at both ends is formed. The part that protrudes outward is wound and covered with an insulating adhesive tape. [Selection] Figure 1

Description

  The present invention relates to a cable connection structure in which crimp terminals are connected to each other with screw parts and an insulating material is wound.

In recent years, the connection of power cables for large pumps and motors has been increased by connectors, but there are many conventional systems that connect crimp terminals to each other with screw parts and wind insulation. ing.
As shown in FIG. 8, the connection structure of this system has, for example, core wires 1a and 2a that are exposed by peeling off an insulating film at the distal ends of a cable 1 connected to a power source and a cable 2 connected to a motor. The crimp terminals 3 are fixed to each other, and the crimp terminals 3 are connected to each other by bolts 4a and nuts 4b. And the varnish processing tape 5 is wound so that the crimp terminal 3 and the core wires 1a and 1b may be wrapped, the self-bonding tape 6 is wound thereon, and further, the insulating adhesive tape 7 is wound thereon. Yes.

  This is because the insulating varnish treatment tape 5 has sufficient insulation performance but is not sticky, so that the self-bonding tape 6 is wound while pulling from above so that the varnish treatment tape 5 is firmly pressed and covered. It is a thing. This prevents moisture from entering. Further, as the insulating adhesive tape 7, a polyvinyl chloride adhesive tape (JIS C 2336) for electrical insulation is generally used.

  By the way, the connecting portion of the cable is removed by removing the insulating material when the motor is inspected or repaired. In general, this insulation material is removed by cutting the insulation material wound in multiple layers with an electric knife or cutter knife little by little so as not to damage the coating portion of the cables 1 and 2, and then sequentially peeling off the surface side. Yes.

  Note that the conventional cable connection structure described above has been practiced for a long time, and no known documents such as patent gazettes were found.

  The cable connection structure of the crimp terminal and the insulating material as described above is used for a lot of time (10 to 20 minutes) to sequentially peel off the insulating adhesive tape 7, the self-bonding tape 6, and the varnish treatment tape 5 in the wire breaking operation. In addition, there is a problem that the coating of the cables 1 and 2 is often damaged by an electric knife or cutter knife.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cable connection structure capable of easily and surely performing a wire breaking operation in a short time.

  In order to solve the above-described problems, the cable connection structure of the present invention is configured as follows. That is, a cable in which an insulating wire member is disposed in the longitudinal direction of a cable at a connection portion in which crimp terminals fixed to the end of the cable are connected by screw parts, and an insulating material is wound thereon. The insulating material is formed by sequentially winding a varnish processing tape, a self-bonding tape, and an insulating adhesive tape, the linear member is an ultra-high molecular weight polyethylene line, and both ends are insulated. It is characterized by being arranged in a state of protruding outward from the material.

  The crimp terminal and the insulating material may be the same as the conventional one, but are not excluded as long as the same purpose can be achieved. The crimp terminal is generally a copper wire crimp terminal (JISC2805). In addition, the varnish treatment tape of the insulating material includes a tape (sheet) shape as well as a tape shape.

The wire member is an ultra high molecular weight polyethylene line that is selected by the inventor through experiments from a number of wire materials to cut a large number of layers of insulation material when the cable is disconnected.
This is a fishing line in which a plurality of polyethylene fibers are knitted together and is generally called a PE line. What is necessary is just to select suitably about the thickness and intensity | strength of a wire member by the state of winding of an insulating material. Further, as described in claim 2, the wire member has both ends projecting outward from the insulating material, and a ring having a size on which a finger can be caught is formed. It is desirable to cover these parts with insulating adhesive tape.

  In the cable connection structure of the present invention, the crimp terminals at the tip of the cable are connected by screw parts, an insulating wire member is disposed in the longitudinal direction of the cable, and an insulating material is wound. Therefore, when the cable is disconnected, the insulating material can be safely cut in a short time (about 10 seconds) without damaging the cable covering. Moreover, no special tools are required and no experience is required.

  Further, as described in claim 2, if a ring having a size in which a finger is hooked is formed on both ends of the linear member, and a portion protruding outward from the insulating material is wound with an insulating adhesive tape, There is no fear of intrusion such as deterioration of the strip member, insulation and moisture from the outside.

The embodiment of the connection structure of the cable of this invention is shown, and is sectional drawing of a connection part. The work procedure of a connection structure is shown, and it is a front view which shows the state which connected crimp terminals with the screw components. 2A is a front view showing a state in which the filament member is attached to the state of FIG. 2, FIG. 2B is a side view showing an upper state of the filament member, and FIG. It is a side view which shows a state. It is sectional drawing which shows the state which wound the varnish processing tape in the state of FIG. It is sectional drawing which shows the state which wound the self-fusing tape in the state of FIG. It is explanatory drawing which shows the state which coat | covered the linear member protruded outward in FIG. 1 with the insulating adhesive tape. It is a front view which shows the state at the time of the cutting | disconnection of the insulating material in the cable disconnection work. It is sectional drawing which shows the connection structure of the conventional cable.

An embodiment of a cable connection structure of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a connection structure applied to a power cable for a motor installed in a power plant. Although only one cable is shown in the drawing, actually three cables are connected, and the connection work and the disconnection work are performed at the same time.
The cable connection structure is mostly the same as the conventional one described with reference to FIG. 8, and the same reference numerals are used for the same components.

1 is a cable connected to a power source, 2 is a cable connected to a motor, 3 is a crimp terminal, 5, 6 and 7 are insulating materials, and 8 is a wire member.
Here, the crimp terminal 3 uses a crimp terminal for copper wire (JISC2805) with one mounting hole (R-shaped), and the insulation coating at the tip of the cables 1 and 2 is peeled off and exposed. The crimping terminals 3 are connected to each other with bolts 4a and nuts 4b.

  The linear member 8 is an ultra high molecular weight polyethylene line, and here, Ultra Dyneema No. 12 (thickness: 0.75 mm, strength: 68 kg) manufactured by YGK Yotsuami Co., Ltd. is used. This member is used as a fishing line, is light and strong, and also has an insulating property.

The insulating material is composed of a varnish treatment tape 5, a self-bonding tape 6, and an insulating adhesive tape 7, which are sequentially wound around a connecting portion.
Here, the varnish treatment tape 5 uses a varnish rayon bias tape VRT manufactured by Nitto Denko Corporation. The dielectric breakdown voltage (kv) is 8 to 9 (lowest) and 9 to 11 (average).
Further, as the self-bonding tape 6, FUKO No. 2 (a product conforming to the standards of the Japan Electric Power Cable Connection Technology Association) manufactured by Furukawa Electric Co., Ltd. is used. The dielectric breakdown strength is 30 kv / mm or more.
Moreover, the insulation adhesive tape 7 uses the polyvinyl chloride adhesive tape No. 21 for electrical insulation which is a JIS C2336 Class A certified product of Nitto Denko Corporation. Dielectric breakdown voltage-normal is 61.2 kv / mm. The insulating adhesive tape 7 also has a function of waterproofing the two insulating layers.

Next, the operation of forming the cable connection structure will be described with reference to FIGS.
First, as shown in FIG. 2, the crimping terminals 3 to which both ends of the cables 1 and 2 are fixed are overlapped and connected by bolts 4a and nuts 4b.
Next, as shown in FIG. 3, the wire member 8 is cut about 10 cm longer than the length around which the insulating material is wound at both ends, and a ring 8a is formed at both ends (made by hand), and a cable is connected to the connecting portion. 1 and 2, the upper end and the lower end are positioned in the section where the cables 1 and 2 are coated with insulation as shown in (a) and (b), and each is fixed with an adhesive tape (not shown).

Next, as shown in FIG. 4, the varnish treatment tape 5 is wound around the connection portion. The exposed portion is wound twice, and the uneven portion is appropriately increased in the number of turns.
Subsequently, as shown in FIG. 5, the self-bonding tape 6 is wound. In this operation, the tape is wound three or more times so that the half width of the tape overlaps while pulling lightly so as not to cause wrinkles.
Subsequently, the insulating adhesive tape 7 is wound three or more times so that the half widths of the tape overlap. FIG. 1 shows a state in which the adhesive tape holding both ends of the linear member 8 is peeled off at this stage. Since there are three motor connections, the insulating adhesive tape 7 is wound around the three cables in red, white and blue colors.

  Subsequently, as shown in FIG. 6, the linear member 8 protruding from both ends of the wound insulating material is wound and covered with the insulating adhesive tape 9. The insulating adhesive tape 9 is of a color different from the colors (red, white, blue) used in the previous insulating adhesive tape 7.

Next, the disconnection work of the cable connected as described above will be described.
First, the insulating adhesive tape 9 covering the wire member 8 is unwound (a cutter or the like is not used). Next, a finger is put on the lower ring 8a of the linear member 8 to fix it, and a finger is put on the upper ring 8a of the linear member 8 and pulled at an angle of 90 degrees or more with respect to the insulating material. Thereby, the varnish processing tape 5 of the insulating material, the self-bonding tape 6 and the insulating adhesive tape 7 are simultaneously cut. When the insulating layer is thick, it is preferable to pass the driver through the wheel 8a and pull it.
Since the insulating material can be easily peeled off by placing a finger on the cut portion, the cable can be disconnected by removing the bolt 4a, and the time between them is within 30 seconds.

In addition, the inventors confirmed that the insulation performance of the connecting portion of the cable is not deteriorated by the intervention of the wire member 8 by performing a three-month exposure test and a humidification test.
In the 3-month exposure test, the sample is left outdoors for 3 months without direct rain, and the results of the DC leak test and AC pressure test before and after the test are checked for any abnormalities. The humidification test is a greenhouse with a frontage of 1.8m, a height of 1.5m, and a depth of 1.8m. Repeated humidification and warming (daytime) and room temperature (nighttime), and then humidity is 100% for 3 months. The change of the insulation resistance after a while is examined.

DESCRIPTION OF SYMBOLS 1 Cable 1a Core wire 2 Cable 2a Core wire 3 Crimp terminal 4a Bolt 4b Nut 5 Varnish processing tape 6 Self-bonding tape 7 Insulating adhesive tape 8 Line member 8a Ring 9 Insulating adhesive tape

Claims (2)

  Connection of cables in which insulation wire members are arranged in the longitudinal direction of the cable at the connection part where the crimp terminals fixed to the cable ends are connected by screw parts, and the insulating material is wound on the insulation wire member. The insulating material is formed by sequentially winding a varnish processing tape, a self-bonding tape, and an insulating adhesive tape, the linear member is an ultra-high molecular weight polyethylene line, and both end portions are made of the insulating material. A cable connection structure characterized by being arranged in a state of protruding outward.   2. The wire member is formed with a ring of a size that allows fingers to hang on both ends, and an insulating adhesive tape is wound around a portion that protrudes outward from the insulating material. Cable connection structure described.

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