JP4403569B2 - Method of assembling cable connecting portion and cable connecting member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling a power cable connecting portion and a connecting member used for the connecting portion.
[0002]
[Prior art]
There are various types of connection portions of power cables, and one of them is a self-shrinkable connection portion using an insulating cylinder. This assembly procedure is as follows. First, an insulating cylinder having a larger diameter is fitted into the outer periphery of one end of the cable in advance to escape. Next, after the conductor at the cable end is compression-connected, the insulating cylinder is positioned on the compression connection portion. Then, the diameter expansion jig is removed, and the insulating cylinder is mounted on the cable by the self-shrinking force of the insulating cylinder to form the cable connection portion.
[0003]
[Problems to be solved by the invention]
However, there has been a problem that such an assembling method of the connecting portion cannot be used when the work space is small. For example, the work space formed in the basement is a cylindrical or rectangular parallelepiped space, and a cable drawing hole is formed at a position facing the side wall. Each cable end portion is exposed from the lead-out hole, and a connection portion is formed in the work space. At this time, the inner diameter of the lead hole is generally larger than the outer diameter of the cable but smaller than the outer diameter of the connecting member such as an insulating cylinder, and the distance between the opposing side walls is also short. There is no space to leave.
[0004]
Therefore, a main object of the present invention is to provide an assembling method capable of easily forming a connecting portion even when a work space is narrow, and a connecting member used in this method.
[0005]
[Means for Solving the Problems]
In order to eliminate the above-mentioned problem, the connecting part assembly method of the present invention is a system in which cable ends are inserted from both sides of the insulating cylinder, and the waterproof protection layer holding form covering the outer periphery of the connecting part is devised. is there. That is, the assembling method of the present invention is characterized by comprising the following steps in the assembling method of the cable connecting portion formed by inserting the cable end portion from both ends of the insulating cylinder.
[0006]
a: A step of attaching a male fitting to one end of the cable.
b: A step of attaching a female fitting to the other cable end.
c: A step of inserting the ends of both cables into the insulating cylinder and connecting the male metal fitting and the female metal fitting.
d: A step of positioning the waterproof protective layer, which is rolled up at least from one end to the outer peripheral side, on the outer periphery of the insulating cylinder.
e: A step of returning the wound waterproof protective layer to the original state and covering the insulating tube and the portion of the cable adjacent to the insulating tube.
[0007]
Here, the process of positioning the waterproof protective layer on the outer periphery of the insulating cylinder includes the following two methods.
[0008]
{Circle around (1)} A waterproof protective layer is inserted in advance when it is wound around the outer periphery of a core having an inner diameter larger than the outer diameter of the insulating cylinder. Before inserting both cable ends into the insulation tube, insert the core from one cable end and let it escape to the cable base side, then move the core to the outer periphery of the insulation tube after the male and female fittings are connected. Let
{Circle around (2)} A waterproof protective layer is previously fitted in the state where it is wound around the outer periphery of the insulating cylinder.
[0009]
Further, the connecting member of the present invention used in the above assembly method includes a core having an inner diameter larger than the outer diameter of the insulating cylinder, and a waterproof protective layer that is fitted to the outer periphery of the core and rolled up at least from one end to the outer circumference. It is characterized by comprising.
[0010]
Instead of providing the waterproof protective layer around the outer periphery of the core, the waterproof protective layer may be provided directly around the outer periphery of the insulating cylinder.
[0011]
The material of the waterproof protective layer is preferably a material having sufficient flexibility, for example, silicon rubber. Further, the thickness is excellent in mechanical protection as it becomes thicker, but it is difficult to roll it up to the outer peripheral side, and it is difficult to wind it up.
[0012]
Furthermore, another feature of the present invention is to use a connecting member having a waterproof protective layer fitted in the inner and outer double cores instead of using a connecting member having a waterproof protective layer rolled up around the core. There is. That is, the method for assembling a cable connecting portion formed by inserting the cable end portion from both ends of the insulating cylinder includes the following steps.
[0013]
f: An inner core, an outer core fitted to the outside of the inner core, and a waterproof protective layer. One end of the waterproof protective layer is fitted to the outer side of the inner core, and the other end of the folded waterproof protective layer is outside A step of preparing a cable connecting member fitted on the outer side of the core, and positioning the connecting member on one end side of the insulating cylinder in a state where the inner core is fitted on the outer side of the cable.
g: A step of moving the outer core to the other end side of the insulating cylinder and covering a part of the waterproof protective layer on the insulating cylinder.
h: A step of moving the inner core to one end side of the insulating cylinder and covering the vicinity of the insulating cylinder and the cable with the insulating cylinder.
[0014]
According to this method, the waterproof protective layer can be covered on the insulating cylinder by a simple operation of moving the outer core and the inner core in the cable axial direction.
[0015]
The connecting member includes an inner core, an outer core fitted on the outer side of the inner core, and a waterproof protective layer. One end side of the waterproof protective layer is fitted on the outer side of the inner core, and is folded back. The other end side of this is fitted to the outside of the outer core.
[0016]
Here, the inner core has an inner diameter that is equal to or slightly smaller than the outer diameter of the large-diameter portion to be coated, and in the waterproof protective layer, the turning point at which the outer diameter becomes smaller is the folding position, and this folding position is almost at the end of the inner core. It is preferable to make it correspond. With this configuration, it is possible to cover the change of the diameter of the waterproof cylinder in correspondence to the change of the diameter of the insulating cylinder.
[0017]
Furthermore, if a plurality of grooves extending from one end to the other end are formed in each of the inner and outer cores, the core is removed in the outer peripheral direction of the cable by removing a part of each of the inner and outer cores sandwiched by the grooves as a broken fragment. be able to.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
Example 1
1-4 is explanatory drawing of this invention assembly method. In this assembling method, as shown in FIG. 1, the connecting portion is configured by inserting the cable end portions 2A and 2B from both sides of the insulating cylinder 1. When forming the connecting portion, as shown in FIG. 3, a waterproof protection layer 35 in a wound state is previously fitted on the outer periphery of the core 36, and this core 36 is fitted on the outer periphery of one of the cable ends so as to escape. Keep it. The waterproof protective layer 35 and the core 36 will be described later.
[0019]
The insulating cylinder 1 is a cylindrical body having both ends tapered, and includes an inner semiconductive layer 3, an insulating layer 4, and an outer semiconductive layer 5 in order from the center side toward the outer peripheral side. A strip-shaped copper braided wire 6 is spirally wound around the outer periphery of the outer semiconductive layer 5. The heat-shrinkable tube 7 is applied to the outer periphery of the copper braided wire 6, and both ends of the copper braided wire 6 are bent to the outer peripheral side of the heat-shrinkable tube 7 before the cable end is inserted.
[0020]
On the other hand, the cable ends 2A and 2B are stripped of the covering so that the conductor 10, the insulator 11, the outer semiconductive layer 12, the shielding layer 13, and the sheath 14 are exposed stepwise. Further, a male metal fitting 20 is attached to one conductor end, and a female metal fitting 21 is attached to the other conductor end. Both metal fittings 20 and 21 are configured to engage with each other by inserting the male metal fitting 20 into the female metal fitting 21 so as not to easily fall off. That is, the inner peripheral projection 22 is formed on the female fitting 21 and is connected to the outer peripheral groove 23 of the male fitting 20 by engaging the inner peripheral projection 22. Then, the semiconductive tape 25 is wound around the range from the end of the shielding layer 13 to the insulator 11.
[0021]
The cable ends 2A and 2B are inserted from both sides of the insulating cylinder 1 (FIG. 2), and the male fitting 20 and the female fitting 21 are engaged. At this time, the semiconductive tape 25 and the outer semiconductive layer 5 of the insulating cylinder 1 are in contact and electrically connected. Next, the copper braided wire 6 that has been folded back to the outer peripheral side of the heat shrinkable tube 7 is returned, and the end thereof is connected to the shielding layer 13 of each cable.
[0022]
Next, the insulating tape is wound around the sheath 14 of each cable from both ends of the insulating cylinder 1 to form an insulating tape winding layer 30 (FIG. 3).
[0023]
Thereafter, the waterproof protective layer 35 and the core 36 that have been fitted on the outer periphery of one cable and moved are moved and positioned on the insulating cylinder 1 (FIG. 3). The waterproof protective layer 35 is a cylindrical body having both ends tapered, and is made of silicon rubber. The intermediate portion has a uniform diameter, and only the both end portions are configured such that the diameter is smaller toward the opening side corresponding to the outer shape of the insulating tape winding layer 30. The inner diameter of the intermediate portion is slightly smaller than the outer diameter of the insulating cylinder 1, and the inner diameter of the opening at both ends is slightly smaller than the outer diameter of the cable. Such a waterproof protective layer 35 is fitted on the outer periphery of the core 36, and is rolled up from both ends to the outer peripheral side. In order to prevent the wound state from returning to its original state, it is preferable that a pressing metal fitting (not shown) having a concave cross section is fitted from the outer peripheral side of the cable at both ends of the waterproof protective layer, that is, at the wound portion. The core 36 is a cylinder formed by combining two semicylindrical pieces, and has an inner diameter slightly larger than the outer diameter of the insulating cylinder 1.
[0024]
The core 36 is pulled out from such a combination of the waterproof protective layer 35 and the core 36. The extracted core 36 is divided and removed to the outer periphery of the cable. Then, the wrapped waterproof protection layer 35 is returned to its original state, and the insulation cylinder 1 and the outer periphery of the cable are covered with the waterproof protection layer 35 (FIG. 4).
[0025]
In the above assembly method, the cable ends 2A and 2B are inserted from both sides of the insulating cylinder 1, so that the insulating cylinder is released to one side of the cable as in the case of using a conventional diameter-expanded insulating cylinder. There is no need to keep it. In addition, the method of the present invention requires that the waterproof protective layer attached to the core instead of the insulating cylinder is allowed to escape to one side of the cable, but the waterproof protective layer is configured to be rolled up and wound around the outer peripheral side. Therefore, the length in the axial direction is short, and the distance required for escape is much shorter than when the insulation cylinder itself is escaped. In addition, unlike the tape winding, the waterproof protective layer is an integral member, so there is no gap and high waterproofness can be easily realized.
[0026]
In this case, the waterproof protective layer was fitted on the outer periphery of the core, and the cable end was released on one cable in advance before being inserted into the insulating cylinder, but the core was fitted on the outer periphery of the insulating cylinder from the beginning. A waterproof protective layer may be attached to the outer periphery. In this case, since there is no cable connecting member that escapes on one of the cables, the formation of the connecting portion can be easily performed even when the work space is narrower.
[0027]
In addition, as shown in FIG. 5, the waterproof protective layer may be divided into two and two short waterproof protective layers may be used. This uses the 1st core 40 and the 2nd core 41, and what attached | attached the outer periphery of each core 40 and 41 in the state which wound the 1st waterproof protection layer 42 and the 2nd waterproof protection layer 43, respectively. . The inner diameter of the first core 40 is slightly larger than the outer diameter of the insulating cylinder 1, and the inner diameter of the second core 41 is slightly larger than the outer diameter of the first waterproof protection layer 42 fitted on the outer periphery of the first core 40. In this case, each of the waterproof protection layers 42 and 43 is wound up by turning up only one end side toward the outer peripheral side.
[0028]
The combination of the first and second cores 40 and 41 and the first and second waterproof protective layers 42 and 43 is allowed to escape to one side of the cable, and the first core 40 is first extracted and the first waterproof protective layer 42 is wound. Return and cover from about half of the insulating cylinder 1 (the right half of FIG. 6) to the outer periphery of the cable. Next, the second core 41 is extracted, and the second waterproof protective layer 43 is rewound to cover the remaining half of the insulating cylinder 1 (left half in FIG. 6) to the outer periphery of the cable. Thus, the first waterproof protective layer 42 and the second waterproof protective layer 43 partially overlap to cover the insulating cylinder 1. In this assembling method, the assembling procedure of the connecting portion up to FIG. 5 is the same as that shown in FIGS.
[0029]
(Example 2)
Next, a method for assembling a cable connection portion using a connection member in which a waterproof protective layer is fitted to a double core will be described. Also in this assembling method, the configuration of the insulating cylinder and the point of forming the connecting portion by attaching the male metal fitting / female metal fitting to the cable end and inserting from both sides of the insulating cylinder are the same as in the first embodiment. .
[0030]
7A is a partial cross-sectional view of the waterproof protective layer 35, and FIG. 7B is an end view thereof. This is a room-temperature self-shrinkable tube, in which approximately half of the longitudinal direction is a small-diameter portion 35A covered on the power cable, and the other half is a large-diameter portion 35B covered on the insulating cylinder. The opening side of the small diameter portion 35A is formed in a taper shape, and the boundary portion between the small diameter portion and the large diameter portion 35B is also formed in a taper shape. The inner diameter of the small diameter portion 35A is smaller than the outer diameter of the cable, and the inner diameter of the large diameter portion 35B is smaller than the outer diameter of the insulating cylinder.
[0031]
Next, the inner (outer) core 51 (52) into which the waterproof protective layer 35 is fitted will be described with reference to FIG. FIG. 8A is a side view of the inner (outer) core 51 (52) used in the method for forming a power cable connecting portion of the present invention, and FIG. 8B is an end view thereof. The inner (outer) core 51 (52) is a 2 mm thick soft polyethylene cylinder whose length is slightly longer than half of the waterproof protective layer 35 and whose inner diameter is substantially the same as the large-diameter portion to be covered later. It is. The outer diameter of the inner core 51 is about 42 mm, and the inner diameter of the outer core 52 is about 55 mm.
[0032]
Two pairs of grooves 53 are formed on the outer periphery of the inner (outer) core 51 (52). The groove 53 is a parallel groove extending from one end to the other end of the inner (outer) core 51 (52). By breaking the inner (outer) core 51 (52) along the groove 53, the groove 53 is inserted into the cable. Remove the inner (outer) core 51 (52) from the state.
[0033]
In this example, two pairs of grooves 53 are provided, but usually only one pair is sufficient. Of the two pairs of grooves 53, the arc-shaped cross-section portion sandwiched between the pair of grooves is broken after the connection portion is formed to become a broken piece 51A (52A), which is separated from the remaining portion 51B (52B) of the C-shaped cross section. As a result of removing the broken piece 51A (52A), a notch corresponding to the size of the broken piece 51A (52A) is formed in the remaining part 51B (52B). Outside) Remove the core 51 (52) from the cable.
[0034]
The arrangement method of the grooves 53 is not particularly limited. The inner (outer) core 51 (52) may be formed from one end to the other end. That is, not only parallel grooves but also non-parallel grooves may be used. As non-parallel grooves, the inner (outer) core 51 (52) has a narrow groove interval on one end side and a wide groove interval on the other end side, and is formed in a tapered shape or a corrugated groove. Is mentioned. By using non-parallel grooves, it is possible to suppress breakage of the groove portions due to the tightening force of the waterproof protective layer 35 and the like other than when necessary.
[0035]
The strength of the location where each groove 53 is formed is that the groove forming location of the inner (outer) core 51 (52) is not easily broken by the tightening force of the waterproof protective layer 35, and the operator pulls it with pliers or the like. It should be of a level that can be easily broken. If both ends of the groove are notches reaching the inner periphery of the inner (outer) core 51 (52), the removal work of the broken pieces can be further facilitated. Furthermore, the cross-sectional shape of the groove 53 is not particularly limited, and may be appropriately selected such as a U shape and a V shape. In this example, a V groove having a depth of 1.5 mm is used. In addition, the groove 53 may be formed in a perforation shape partially communicating with the inner periphery.
[0036]
Such a waterproof protective layer 35 and the inner and outer cores 51 (52) are used in combination as shown in FIG. That is, approximately half of the waterproof protection layer 35 (small diameter portion: one end side) is fitted to the outer periphery of the inner core 51. Next, the outer core 52 is fitted on the outer periphery of the inner core 51. Then, the remaining half (thick diameter portion: the other end side) of the waterproof protection layer 35 is folded back and fitted into the outer periphery of the outer core 52.
[0037]
Here, the inner diameter of the inner core 51 is preferably equal to or slightly smaller than the outer diameter of the large-diameter portion to be coated, that is, the maximum outer diameter of the insulating tape winding layer 30 in FIG. The large-diameter portion to be coated refers to a portion having the largest diameter in the coating target immediately before the waterproof protective layer 35 is coated. Further, it is preferable that the turning point 54 (FIG. 7) in which the outer diameter of the waterproof protection layer 35 becomes small is set as the folding position, and the folding position substantially corresponds to the end portion of the inner core 51. In this way, by defining the size of the inner core 51 and the positional relationship between the inner core 51 and the waterproof protective layer 35, it is possible to cope with the change in the diameter of the waterproof protective layer 54 at the change of the diameter of the insulating cylinder, as will be described later. And can be coated.
[0038]
A method for assembling the cable connecting portion of the present invention using such a connecting member will be described.
First, the inner core 51 of the connecting member is fitted on the outer periphery of each of the cable end portions 2A and 2B shown in FIG. 1, and is released to the cable root side. When the connection member is fitted from the end of the cable, the folded-back position of the waterproof protection layer 35 is directed to the male metal fitting side or the female metal fitting side.
[0039]
Next, as shown in FIG. 2 and FIG. 3, the cable ends 2A and 2B are inserted into the insulating cylinder, the male metal fitting 20 and the female metal fitting 21 are connected to each other, and the insulating tape is wound into a taper shape for insulation. The tape winding layer 30 is formed. The configuration of the insulating cylinder, the connection of the male and female fittings 20, 21 and the winding of the insulating tape are the same as in the first embodiment.
[0040]
Thereafter, the connecting member that has escaped to the cable base side is pulled back to one end side of the insulating cylinder 1. At this time, the inner core 51 is stopped at a position where the inner core 51 is in contact with the large diameter portion to be covered.
[0041]
Here, the outer core 52 is moved to the other end side of the insulating cylinder (FIG. 10). Even if the outer core 52 is moved, the inner core 51 does not move because it is held at a position in contact with the large diameter portion to be coated. As the outer core 52 moves, the waterproof protection 35 layer covered on the outer core is returned to its original state, and a part of the waterproof protection layer 35 is covered on the insulating cylinder 1. That is, in this state, almost half of the axial length of the insulating cylinder 1 is covered with the waterproof protective layer 35. The outer core 52 that has been moved is released in a state of being fitted to the outer periphery of the cable on the other side of the insulating cylinder.
[0042]
Next, the inner core 51 is pulled out to the cable base side (one end side of the insulating cylinder). By this extraction, the remaining half of the waterproof protection layer 35 is placed on the end of the insulating cylinder and the portion adjacent to the insulating cylinder 1 in the cable 2B.
[0043]
Then, the inner (outer) core 51 (52) that is penetrated by the cable is removed. At that time, if the broken piece 51A (52A) sandwiched between the pair of grooves 53 is sandwiched with pliers and pulled along the axial direction of the inner (outer) core 51 (52), the inner (outer) core along the groove 53 51 (52) is broken, and broken pieces 51A (52A) are removed. Therefore, the inner (outer) core 51 (52) can be removed by removing the cable from the notch formed at the place where the broken piece 51A (52A) was present.
[0044]
At this stage, since only one end side of the insulating cylinder is covered with the waterproof protective layer, the other end side is similarly covered with the waterproof protective layer 35. Then, as in FIG. 6, the two waterproof protective layers 35 are overlapped at the intermediate portion of the insulating cylinder 1 to complete the covering of the waterproof protective layer 35.
[0045]
According to this assembling method, the waterproof protective layer 35 can be covered with a simple operation of moving the inner and outer cores 51 (52) in the axial direction. Without using the outer core 52, a connection member that fits almost half (the first half) of the waterproof protective layer 35 on the outer periphery of the inner core 51, folds the remaining half (the second half), and overlaps the second half on the first half. It is done. However, with this connecting member, in order to return the folded back half part to the original state, it is necessary to return the folded back part by force, and the workability is very poor. In that respect, in the connecting member of the present invention, the outer core 52 can be moved very easily, and the folded portion can be restored.
[0046]
In addition, in this example, the waterproof protective layer 35 is only about half the length of the insulating cylinder 1, and since each of them is folded, even if the connecting member is allowed to escape to the base side of the cable once, The space required for this is very small.
[0047]
【The invention's effect】
As described above, according to the assembling method of the present invention, it is not necessary to let the insulating cylinder escape to one side of the cable by adopting a method of inserting the cable end from both sides of the insulating cylinder. In addition, the waterproof protective layer is rolled up on the outer peripheral side and held in a folded or folded state, so the axial length is very short, even if you let it escape to one of the cables, The necessary distance can be shortened as much as possible. Therefore, the cable connection portion can be easily formed even in a narrow work space.
[0048]
Further, the cable connecting member of the present invention can be optimally used for the above assembly method.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an assembling method of the present invention showing a state before inserting a cable end into an insulating cylinder.
FIG. 2 is an explanatory view of the assembling method of the present invention showing a state after inserting a cable end into an insulating cylinder.
FIG. 3 is an explanatory view of the assembling method of the present invention showing a state where a waterproof protection layer in a wound state is located on the outer periphery of the insulating cylinder.
FIG. 4 is an explanatory view of the assembling method of the present invention showing a state in which the outer periphery of an insulating cylinder is covered with a waterproof protective layer.
FIG. 5 is an explanatory view of the assembling method of the present invention showing a state in which the waterproof protective layer divided into two parts is wound around the outer periphery of the insulating cylinder.
FIG. 6 is an explanatory view of the assembling method of the present invention showing a state where the outer periphery of an insulating cylinder is covered with a waterproof protective layer divided into two.
7A is a partial cross-sectional view of a waterproof protective layer used in the assembling method of the present invention, and FIG. 7B is an end view.
8A is a side view of the inner and outer cores used in the assembling method of the present invention, and FIG. 8B is an end view.
FIG. 9 is a cross-sectional view of a connecting member of the present invention using an inner and outer double core.
FIG. 10 is an explanatory diagram of a method for assembling the cable connecting portion showing a state in which the outer core is moved in the axial direction.
[Explanation of symbols]
1 Insulating cylinder 2A, 2B Cable end 3 Internal semiconductive layer 4 Insulating layer 5 External semiconductive layer 6 Copper braided wire 7 Heat shrinkable tube 10 Conductor
11 Insulator 12 External semiconductive layer 13 Shielding layer 14 Sheath 20 Male fitting
21 Female fitting 22 Inner peripheral projection 23 Outer peripheral groove 25 Semiconductive tape
30 Insulating tape wound layer 35 Waterproof protective layer 35A Small diameter part 35B Large diameter part
36 core 40 first core 41 second core 42 first waterproof protective layer
43 2nd waterproof protective layer 51 Inner core 52 Outer core 51A, 52A Broken fragment
51B, 52B Remaining 53 Groove 54 Turn

Claims (3)

A cylindrical inner core;
A cylindrical outer core fitted to the outside of the inner core;
Comprising a cylindrical water-proof protective layer covering a covering object having a large-diameter portion and a small-diameter portion;
One end side of this waterproof protection layer is fitted to the outside of the inner core, and the other end side of the folded waterproof protection layer is fitted to the outside of the outer core,
Whether the inner core has the same inner diameter as the outer diameter of the coating target so that when the inner core is moved to the coating target, the inner core is held in contact with the coating target Slightly smaller,
A cable connecting member characterized in that, in the waterproof protective layer, a turning point at which the outer diameter becomes small is set as a folding position, and the folding position and the end portion of the inner core substantially correspond to each other.   The cable connecting member according to claim 1, wherein a plurality of grooves extending from one end to the other end are formed in each of the inner and outer cores. In the method of assembling the cable connection part formed by inserting the cable end from both ends of the insulating cylinder,
Attaching a male fitting to one cable end; and
Attaching a female fitting to the other cable end; and
Inserting both cable ends into an insulating cylinder and connecting the male and female brackets;
A cable connecting member according to claim 1 or 2 is prepared, and the connecting member is moved to one end side of the insulating cylinder in a state where the inner core is fitted to the outside of the cable, and the inner core is moved to the large diameter portion of the insulating cylinder. A contact process;
In a state where the inner core is in contact with the large diameter portion of the insulating cylinder, the outer core is moved to the other end side of the insulating cylinder, and a part of the waterproof protective layer is coated on the insulating cylinder;
A method of assembling the cable connecting portion, comprising: pulling out the inner core to the cable root side and covering the vicinity of the insulating tube and the insulating tube in the cable with the remaining part of the waterproof protective layer .

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