JP2018023264A - Rubber molding component and power cable connection component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber molding component which can inhibit exposure of a shield layer within a sheath at a power cable.SOLUTION: The invention relates to a rubber molding component attached to an end part of a power cable. The power cable includes a shield layer and a sheath covering an outer periphery of the shield layer. The rubber molding component includes: a cylindrical body part which holds an end part of the sheath and applies a predetermined contact pressure to the sheath; and an anti-slip part which is disposed between the sheath and the body part and inhibits the sheath from being axially displaced relative to the shield layer by thermal effect. The anti-slip part has a high frictional resistance part in which a static friction coefficient between the anti-slip part and the sheath is larger than a static friction coefficient between the body part and the sheath.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rubber molded part and a power cable connecting part.

  One of parts for constructing a terminal connection part and an intermediate connection part of a power cable is a rubber mold part (for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-289650

  It is desired to suppress the exposure of the shielding layer in the sheath provided in the power cable. In the manufacturing process, strain in the tensile direction remains in the longitudinal direction (axial direction of the power cable) of the sheath. This residual strain is released by a thermal effect such as a change in the outside air temperature or a heat cycle such as energization. If it does so, a sheath may shrink | contract (shrink back) in the longitudinal direction, and may shift | deviate with respect to a shielding layer. As the sheath contracts, the shielding layer in the sheath is exposed from the sheath (rubber mold component), and as a result, a load is applied due to the contraction of the sheath, and there is a risk of damage such as breakage (cutting).

  Therefore, an object of the present invention is to provide a rubber molded part that can suppress the exposure of the shielding layer in the sheath of the power cable.

  Another object of the present invention is to provide a power cable connection part that can suppress exposure of a shielding layer in a sheath of the power cable.

The rubber mold component according to the present disclosure is
It is a rubber mold part attached to the end of the power cable,
The power cable includes a shielding layer and a sheath covering an outer periphery of the shielding layer,
The rubber mold component is
A cylindrical main body that grips the end of the sheath and applies a predetermined surface pressure to the sheath;
An anti-slip portion interposed between the sheath and the main body portion to suppress axial displacement of the sheath with respect to the shielding layer due to thermal effects;
The anti-slip portion includes a high friction resistance portion in which a static friction coefficient between the anti-slip portion and the sheath is larger than a static friction coefficient between the main body portion and the sheath.

The power cable connection parts according to the present disclosure are:
The sheath that is disposed on the outer periphery of a plurality of power cables having a sheath having an end portion to which a main body portion of the rubber mold component is mounted and a shielding layer in the sheath is shifted from the rubber mold component and is affected by a thermal effect. Equipped with a non-slip mechanism that suppresses the axial displacement of
The anti-slip mechanism includes a rubber spacer that is attached so as to apply a predetermined surface pressure to the outer peripheral surface of the sheath of each power cable and bundles the plurality of power cables.
The rubber spacer has a high friction resistance portion in which a static friction coefficient between the rubber spacer and the sheath is larger than a static friction coefficient between the main body portion and the sheath.

  The rubber mold component can suppress exposure of the shielding layer in the sheath of the power cable.

  The component for connecting the power cable can suppress the exposure of the shielding layer in the sheath of the power cable.

It is a longitudinal cross-sectional view of the rubber mold component which concerns on Embodiment 1. FIG. It is the schematic of the components for connection of the power cable which concerns on Embodiment 2. FIG. It is sectional drawing which shows the state cut | disconnected by the (III)-(III) cutting line of the components for connection of the power cable shown in FIG.

<< Description of Embodiments of the Present Invention >>
First, the contents of the embodiments of the present invention will be listed and described.

(1) A rubber mold component according to one aspect of the present invention is
It is a rubber mold part attached to the end of the power cable,
The power cable includes a shielding layer and a sheath covering an outer periphery of the shielding layer,
The rubber mold component is
A cylindrical main body that grips the end of the sheath and applies a predetermined surface pressure to the sheath;
An anti-slip portion interposed between the sheath and the main body portion to suppress axial displacement of the sheath with respect to the shielding layer due to thermal effects;
The anti-slip portion includes a high friction resistance portion in which a static friction coefficient between the anti-slip portion and the sheath is larger than a static friction coefficient between the main body portion and the sheath.

  According to said structure, exposure of the shielding layer in the sheath in an electric power cable can be suppressed. The high frictional resistance part having a higher static friction coefficient between the sheath and the sheath than the static friction coefficient between the body part and the sheath is brought into contact with the sheath, and a predetermined surface pressure is applied to the sheath via the high frictional resistance part by gripping the main body part. This is because the frictional force acting between the anti-slip portion and the sheath can be increased by adding. Therefore, it is easy to suppress the contraction of the sheath in the longitudinal direction due to the thermal effect, and it is easy to suppress the sheath from shifting in the axial direction with respect to the shielding layer. In addition, even if the sheath is displaced in the axial direction with respect to the shielding layer, the non-slip portion easily follows the displacement, and the main body portion extends to follow the slip of the non-slip portion to some extent. The part continues to cover the sheath. By suppressing the axial displacement of the sheath, it is difficult to apply a load to the shielding layer due to the axial displacement of the sheath, and the shielding layer is not easily broken due to the load.

  (2) As one form of the said rubber mold component, it is mentioned that the shape of the said anti-slip | skid part is a cylinder shape.

  According to said structure, it is easy to apply a predetermined surface pressure to the outer periphery perimeter of a sheath, and to suppress shrinkage | contraction of a sheath over the outer periphery perimeter of a sheath by comprising a slip prevention part by cylinder shape.

  (3) As one form of the said rubber mold component, it is mentioned that the length along the axial direction of the said rubber mold component in the said anti-slip | skid part is 30 mm or more and 120 mm or less.

  If the above-mentioned length of the anti-slip portion is 30 mm or more, the contact area with the sheath can be widened, so that the axial displacement of the sheath can be easily suppressed. If the length of the non-slip is 120 mm or less, it is not excessively long, and therefore it is easy to attach to the end of the power cable.

  (4) As one form of the said rubber mold component, it is mentioned that the thickness of the said anti-slip | skid part is 0.5 mm or more and 5.0 mm or less.

  If the thickness of the non-slip portion is 0.5 mm or more, it is easy to suppress the exposure of the shielding layer by having a certain thickness, and it is easy to increase the mechanical strength of the anti-slip portion itself. If the thickness of the non-slip portion is 5.0 mm or less, it will not be excessively thick and can be easily attached to the end of the power cable.

  (5) As one form of the said rubber mold component, it is mentioned that the surface which does not have the said slip prevention part among the internal peripheral surfaces of the said main-body part, and the inner surface of the said slip prevention part are flush | level.

  According to said structure, compared with the case where the inner surface of a slip prevention part is located inside the inner surface of the slip prevention part of a main-body part, it is easy to mount | wear to the edge part of a power cable. In addition, since there is no step due to being flush, it is possible to suppress the formation of a gap in the step and an electrical weak point.

  (6) As one form of the said rubber mold component, it is mentioned that either one of the inner peripheral surface of the said main-body part or the inner surface of the said anti-slip | skid part is provided with the mark which shows the folding | turning position of the said main-body part.

  When attaching the rubber mold part to the end of the power cable, the insertion side of the power cable in the rubber mold part is folded back, and after the insertion, the folded part is returned to the original and covered on the sheath, Easy to attach to the end of the power cable. According to said structure, by providing the mark which shows a folding | turning position, an appropriate folding | turning position can be known clearly and it can suppress that dispersion | variation arises in the folding | turning position. Further, the rubber molded component and the end portion of the power cable can be mounted at an accurate position. Because the mark can also be used as a mark of the insertion position, for example, when the power cable is inserted into a rubber molded part in which the main body portion is folded back to the mark, the power cable may be inserted until the end surface of the sheath is the mark. .

  (7) As one form of the rubber molding component, an inner peripheral surface of the main body portion includes the mark, and the anti-slip portion is between the opening end of the main body portion on the insertion side of the power cable and the mark. Is arranged.

  According to said structure, it is easy to mount | wear to the edge part of an electric power cable. When attaching rubber molded parts to the end of the power cable, the anti-slip part can be placed on the outer periphery of the main body by folding the main body with the mark as the base point as described above. It is because it does not move and the anti-slip portion does not hinder the wearing.

  (8) As one form of the said rubber mold components, it is mentioned that the said main-body part is return | folded by making the said mark into a base point.

  According to the above configuration, it is possible to simplify the folding work of the main body part at the construction site where the terminal connection part and the intermediate connection part of the power cable are constructed, so the mounting work of the rubber mold part to the end part of the power cable is simplified. Can be

  (9) As one form of the said rubber mold component, providing the cylindrical electric field relaxation layer integrally formed in the internal peripheral surface of the said main-body part is mentioned.

  According to said structure, the electric field concentration to the front-end | tip part of a shielding layer can be suppressed, and the dielectric breakdown of the insulator inside a shielding layer can be suppressed.

(10) A power cable connecting component according to an aspect of the present invention is provided as follows:
The sheath that is disposed on the outer periphery of a plurality of power cables having a sheath having an end portion to which a main body portion of the rubber mold component is mounted and a shielding layer in the sheath is shifted from the rubber mold component and is affected by a thermal effect. Equipped with a non-slip mechanism that suppresses the axial displacement of
The anti-slip mechanism includes a rubber spacer that is attached so as to apply a predetermined surface pressure to the outer peripheral surface of the sheath of each power cable and bundles the plurality of power cables.
The rubber spacer has a high friction resistance portion in which a static friction coefficient between the rubber spacer and the sheath is larger than a static friction coefficient between the main body portion and the sheath.

  According to the above configuration, the power cable connection component is arranged so as to be shifted from the rubber mold component, and is provided at a location close to the end of the sheath without directly covering the end of the sheath like the rubber mold component. Therefore, exposure of the shielding layer in the sheath of the power cable can be suppressed, similarly to the rubber mold component according to one embodiment of the present invention described above.

  (11) As one form of the power cable connecting part, the anti-slip mechanism is attached to the outer peripheral surface of the rubber spacer and tightens the rubber spacer, whereby a predetermined amount is attached to the sheath via the rubber spacer. It is mentioned that a bracket for applying a surface pressure is provided.

  According to said structure, exposure of the shielding layer in the sheath in an electric power cable can be suppressed.

<< Details of Embodiment of the Present Invention >>
Details of embodiments of the present invention will be described below with reference to the drawings. The same code | symbol in a figure shows the same name thing. In Embodiment 1, rubber molded parts will be described, and in Embodiment 2, power cable connection parts will be described.

Embodiment 1
[Rubber mold parts]
A rubber molded component 1 according to Embodiment 1 will be described with reference to FIG. The rubber mold component 1 according to the first embodiment is attached to an end portion of a power cable 50 including a shielding layer 55 and a sheath 56 that covers the outer periphery of the shielding layer 55. In FIG. 1, for convenience of explanation, a state where the rubber molded component 1 is attached to the end of the power cable 50 is shown, and the power cable 50 is indicated by a two-dot chain line. The power cable 50 includes, in order from the inner periphery, a conductor (not shown), an internal semiconductive layer (not shown), an insulator 53, an external semiconductive layer (not shown), a shielding layer 55, and a sheath 56. The internal and external semiconductive layers can be omitted as required. One of the features of the rubber molded part 1 includes a main body 11 that applies a predetermined surface pressure to the sheath 56, and a non-slip part 15 that is interposed between the main body 11 and the sheath 56. 15 has a predetermined high frictional resistance portion 15a. Thereby, as will be described in detail later, axial displacement of the sheath 56 with respect to the shielding layer 55 due to thermal influence (hereinafter, sometimes referred to as axial displacement of the sheath 56) is suppressed. Hereinafter, each configuration will be described in detail.

[Main unit]
The main body 11 has a cylindrical shape, and the end of the stepped power cable 50 is inserted to enhance the insulation of the end of the power cable 50. Examples of the material of the main body 11 include rubber having excellent electrical insulation properties, such as silicone rubber, ethylene propylene rubber, and chloroprene rubber. The coefficient of static friction μ ₂ between the main body part 11 and the sheath 56 depends on the material of the main body part 11 and the sheath 56, and may be 0.5 or more and 2.0 or less, for example. Examples of the material of the sheath 56 include polyvinyl chloride and polyethylene.

  When the main body portion 11 is attached to the end portion of the power cable 50, the end portion of the sheath 56 located behind (from the lower side in FIG. 1) the conductor at the tip (upper side in FIG. 1) of the power cable 50. Cover over. A metal terminal (not shown) that is electrically connected to the conductor of the power cable 50 is provided at the opening end on the distal end side of the main body 11. The opening end on the rear side of the main body 11 is an opening end on the insertion side of the power cable 50. The opening end of the main body 11 on the insertion side of the power cable 50 is attached to the outer periphery of the end of the sheath 56 and grips the end of the sheath 56 when the end of the power cable 50 is inserted into the main body 11. To do. The main body 11 applies a predetermined surface pressure to the sheath 56 by gripping the end of the sheath 56. The application of a predetermined surface pressure to the sheath 56 is performed via a non-slip portion 15 described later.

  On the inner peripheral surface of the main body 11, a mark 12 that indicates the folding position of the main body 11 may be provided. When the rubber mold component 1 is attached to the end of the power cable 50, the insertion side of the power cable 50 in the rubber mold component 1 is folded back, and after the insertion, the folded portion is returned to its original position and covered on the sheath 56. It is easy to attach the rubber mold component 1 to the end of the power cable 50. If the mark 12 is provided, when the end of the power cable 50 is inserted into the rubber mold part 1 by folding a part of the main body part 11, the proper folding position of the main body part 11 can be clearly known and turned back. Variations in position can be suppressed. Moreover, since the mark 12 can also be used as a mark of the insertion position, the rubber mold component 1 and the end portion of the power cable 50 can be attached at an accurate position.

  It is mentioned that the mark 12 has the protrusion 12a which protrudes toward the inner peripheral surface of the main-body part 11 toward the inner side. In the axial direction of the main body 11, it is preferable that the protrusion 12 a is formed at a position corresponding to the end face of the sheath 56 when the rubber mold component 1 is attached to the power cable 50. If it does so, the rubber mold component 1 and the edge part of the electric power cable 50 can be mounted | worn in an exact position. This is because when the power cable 50 is inserted into the rubber mold component 1 in which the main body portion 11 is folded back to the protrusion 12a, the power cable 50 may be inserted until the end surface of the sheath 56 contacts the protrusion 12a. This is because if the body portion 11 is folded back with the mark 12 as a base point, the portion of the body portion 11 covering the sheath 56 is folded back, and if the folded portion is returned to the original position, the body portion 11 can be attached to the sheath 56. In this case, the protrusion 12 a can be used for positioning the anti-slip portion 15 with respect to the main body portion 11. In the circumferential direction of the main body 11, a region where the protrusion 12 a is formed may be a part of the circumferential direction or a region extending over the entire circumference. The mark 12 may have an arrow (not shown) indicating the position of the protrusion 12a in addition to the protrusion 12a. The arrow may be formed on the rear side of the main body 11 with respect to the protrusion 12a.

  The main body 11 may be folded back with the mark 12 as a base point. If it does so, since the folding | returning operation | work of the main-body part 11 in the construction site which constructs the terminal connection part and intermediate | middle connection part of the power cable 50 can be simplified, the mounting work to the edge part of the power cable 50 of the rubber mold component 1 is carried out. It can be simplified.

[Non-slip part]
The non-slip portion 15 suppresses an axial shift (downward shift in FIG. 1) of the sheath 56 with respect to the shielding layer 55 due to a thermal effect. The non-slip portion 15 is interposed between the main body portion 11 and the sheath 56, the outer surface thereof is in contact with the inner peripheral surface of the main body portion 11, and the gripping force of the main body portion 11 is applied. The surface touches. The anti-slip portion 15 has a high friction resistance portion 15 a in which the static friction coefficient μ ₁ between the anti-slip portion 15 and the sheath 56 is larger than the static friction coefficient μ ₂ between the main body portion 11 and the sheath 56.

The formation region in the thickness direction of the anti-slip portion 15 in the high frictional resistance portion 15 a may be only the region on the inner surface side of the anti-slip portion 15 or the entire region in the thickness direction of the anti-slip portion 15. In the former case, for example, the region on the outer surface side of the anti-slip portion 15 may be formed by a resistance portion equivalent to the static friction coefficient μ ₂ between the main body portion 11 and the sheath 56. Here, the entire anti-slip portion 15 is formed of the high friction resistance portion 15a.

The high friction resistance portion 15a (slip section 15) and the static friction coefficient mu ₁ between the sheath 56, the difference between the static friction coefficient mu ₂ between the main body portion 11 and the sheath 56 Δμ (μ ₁ -μ ₂₎ is 0.5 or more is preferable. If this difference Δ is 0.5 or more, it is easy to suppress the axial displacement of the sheath 56. The difference Δ is preferably as large as possible. For example, it is preferably 1.0 or more, more preferably 1.5 or more, and particularly preferably 2.1 or more. The upper limit value of the difference Δ is practically about 3.6 or less. The static friction coefficient μ ₁ between the high frictional resistance portion 15a and the sheath 56 depends on the material of the high frictional resistance portion 15a and the sheath 56, and may be 1.1 or more and 4.1 or less, for example. The static friction coefficient μ ₁ can be 1.5 or more, 1.8 or more, or 2.1 or more.

This static friction coefficient μ ₁ (μ ₂ ) is obtained as follows, for example. The same material as the sheath 56, which is a solid member (outer diameter: 21 mm) having the same material as the high friction resistance portion 15 a (main body portion 11) (solid or circular in cross section) or hollow (cylindrical) A measurement member B (outer diameter: 21 mm) having the same shape as the material is prepared. The outer peripheral surfaces of the measurement member A and the measurement member B are brought into contact with each other so that their axes are orthogonal to each other. The measurement member B is fixed, and the measurement member A is moved along the axial direction of the measurement member A in a state where a predetermined load (0.98 N in this case) is applied to the measurement member A. The maximum static friction force F (gf) at this time is measured, and the static friction coefficient μ calculated by μ = F / N is determined as the static friction coefficient μ ₁ (μ ₂ ) between the high friction resistance portion 15a (main body portion 11) and the sheath 56. ). N is a vertical drag (here, 100 gf≈0.98 N).

  Examples of the material of the high friction resistance portion 15a (slip prevention portion 15) include silicone rubber and urethane rubber. When the high friction resistance portion 15a and the main body portion 11 are the same type (for example, silicone rubber), the material of the high friction resistance portion 15a has a higher coefficient of static friction with the sheath 56 than the main body portion 11 among the same type. Material. For example, even if the same silicone rubber is used, the high friction resistance portion 15 a is a silicone rubber having a higher static friction coefficient with the sheath 56 than the main body portion 11.

  The shape of the high friction resistance portion 15a (slip prevention portion 15) may be an arc shape in which a part of the sheath 56 in the circumferential direction is not covered, or may be a cylindrical shape that covers the entire circumference of the sheath 56 in the circumferential direction. This shape refers to the shape of the high frictional resistance portion 15a viewed from the axial direction of the rubber mold part 1. When the shape of the high frictional resistance portion 15 a is an arc shape, the length of the arc is preferably a length that covers 2/3 or more of the circumferential direction of the sheath 56. By doing so, the contact area between the high frictional resistance portion 15a and the sheath 56 can be widened, so that the effect of preventing the sheath 56 in the axial direction can be easily obtained. In this case, the high frictional resistance portions 15a may be formed continuously in the circumferential direction of the sheath 56, or a plurality of high friction resistance portions 15a may be formed at regular intervals in the circumferential direction of the sheath 56. When the shape of the high frictional resistance portion 15a is cylindrical, the high frictional resistance portion 15a can be brought into contact with the entire circumference of the sheath 56 in the circumferential direction, so that the axial displacement of the sheath 56 can be easily suppressed effectively. Here, the shape of the high frictional resistance portion 15a (slip prevention member 15) is cylindrical. The high frictional resistance part 15a (slip prevention part 15) may be divided into a plurality of parts in the axial direction.

The length _{L 1} along the axial direction of the rubber mold part 1 of the high frictional resistance portion 15a (slip section 15), for example, preferably 30mm or more 120mm or less. The length L _1, when the high frictional resistance portion 15a is divided into a plurality in the axial direction, and total length. If this length L ₁ is 30mm or more, it is possible to widen the contact area between the sheath 56, easy to suppress the axial displacement of the sheath 56. If this length L ₁ is 120mm or less, the not too excessively long, easily mounted on an end portion of the power cable 50. The length _{L 1} is more preferably 30mm or more 110mm or less, particularly preferably 30mm or more 60mm or less.

  The thickness T of the high frictional resistance portion 15a (slip prevention portion 15) is preferably, for example, 0.5 mm or more and 5.0 mm or less. This thickness T refers to the length in the radial direction of the main body portion 11 in the anti-slip portion 15. If the thickness T is 0.5 mm or more, it is easy to suppress the exposure of the shielding layer 55 by having a certain thickness, and it is easy to increase the mechanical strength of the anti-slip portion 15 itself. If the thickness T is 5.0 mm or more, it will not be excessively thick and can be easily attached to the end of the power cable 50. The thickness T is preferably 2.0 mm or greater and 3.0 mm or less.

  The position where the non-slip portion 15 is disposed with respect to the main body 11 includes the rear side at a position overlapping the sheath 56 of the main body 11. As described above, when the main body portion 11 includes the protrusions 12a (marks 12), the arrangement portion of the anti-slip portion 15 is between the protrusion 12a in the main body portion 11 and the opening end on the rear side. By doing so, the protrusion 12a and the anti-slip portion 15 do not interfere with each other, and the protrusion 12a can be used for positioning the anti-slip portion 15. When the main body part 11 and the anti-slip part 15 are integrated, it is easy to attach the rubber molded component 1 to the end of the power cable 50. When the rubber mold component 1 is attached to the end portion of the power cable 50, the anti-slip portion 15 disposed inside the main body portion 11 is positioned on the outer peripheral side of the main body portion 11 when the main body portion 11 is folded back. This is because the anti-slip portion 15 does not come into contact with the power cable 50 and does not hinder the mounting.

  The anti-slip part 15 and the main body part 11 may be formed integrally, or may be formed independently so as to be separable. When the non-slip portion 15 and the main body portion 11 are integrally formed, the anti-slip portion 15 can be attached to the end portion of the sheath 56 simultaneously with the attachment to the end portion of the power cable 50 of the main body portion 11. Installation work to the end of one power cable 50 is easy. In addition, when the body portion 11 is folded and attached, the anti-slip portion 15 can be folded back. When the non-slip part 15 and the main body part 11 are separated, the rubber mold part 1 is attached to the end of the power cable 50 by sequentially performing the non-slip part 15 and the main body part 11. That is, after the anti-slip portion 15 is attached to the outer periphery of the sheath 56, the main body portion 11 is attached to the outer periphery of the anti-slip portion 15.

  The inner surface of the non-slip portion 15 may be provided with the above-described mark 12. In that case, the main body part 11 does not need to have the mark 12, and the mark 12 is formed at the edge of the anti-slip part 15 (upper end part in FIG. 1).

  The inner surface of the non-slip portion 15 is preferably flush with the inner surface of the main body portion 11 without the anti-slip portion 15. In order to make the inner surface of the non-slip portion 15 and the inner surface of the main body portion 11 flush with each other, for example, the thickness of the portion covering the anti-slip portion 15 of the main body portion 11 is reduced by the thickness of the anti-slip portion 15, For example, the covering portion is formed so as to protrude toward the outer peripheral side by the thickness of the anti-slip portion 15, and the thickness of the main body portion 11 is uniform in the longitudinal direction. When the inner surface of the anti-slip portion 15 and the inner surface of the main body portion 15 without the anti-slip portion 15 are not flush with each other, it is preferable that the inner surface of the anti-slip portion 15 protrudes inward from the inner peripheral surface of the main body portion 11. If it does so, it will be easy to make the slip prevention part 15 contact | adhere to the sheath 56 easily.

[Electric field relaxation layer]
The rubber mold component 1 can include an electric field relaxation layer 13 as necessary. The electric field relaxation layer 13 has a cylindrical shape, and relaxes the concentration of the electric field on the end of the shielding layer 55 of the power cable 50 inserted inside. Thereby, the deterioration by the electrical stress of the insulator 53 of the power cable 50 is reduced, and the dielectric breakdown is suppressed. The electric field relaxation layer 13 is integrally formed on the inner peripheral surface of the intermediate portion in the axial direction of the rubber mold part 1 and covers the insulating layer 53 from the shielding layer 55 (semiconductive tape layer: not shown). Yes. Examples of the material of the electric field relaxation layer 13 include semiconductive rubber.

[Usage]
The rubber molded component 1 according to the first embodiment can be suitably used for a rubber molded component that constructs a terminal connection portion or an intermediate connection portion of a power cable. Moreover, the rubber mold component 1 of Embodiment 1 can be suitably used for a rubber mold component that constructs a terminal connection portion or an intermediate connection portion of a power cable including a polyethylene sheath that is likely to cause shrinkback.

[Function and effect]
According to the rubber mold component 1 according to the first embodiment, the high frictional resistance portion 15a is brought into contact with the sheath 56, and a predetermined surface pressure is applied to the sheath 56 through the high frictional resistance portion 15a by gripping the main body portion 11. Thus, the frictional force acting between the anti-slip portion 15 and the sheath 56 can be increased. Therefore, it is easy to suppress contraction in the longitudinal direction of the sheath 56 due to thermal influence, and it is easy to suppress the sheath 56 from shifting in the axial direction with respect to the shielding layer 55. In addition, even if the sheath 56 is displaced in the axial direction with respect to the shielding layer 55, the non-slip portion 15 easily follows the deviation, and the main body portion 11 follows the slip of the anti-slip portion 15 to some extent. By extending, the main body 11 can continue to cover the sheath 56. Therefore, exposure from the sheath 56 (rubber mold part 1) of the shielding layer 55 can be suppressed. Since the axial displacement of the sheath 56 can be suppressed, it is difficult to apply a load to the shielding layer 55 due to the axial displacement of the sheath 56, and the shielding layer 55 is not easily broken due to the load.

<< Embodiment 2 >>
[Power cable connection components]
With reference to FIG. 2 and FIG. 3, the component 2 for connection of the power cable which concerns on Embodiment 2 is demonstrated. The power cable connection component 2 according to the second embodiment is arranged on the outer periphery of the plurality of power cables 50 so as to be shifted from the rubber mold component 10 attached to the end of each power cable 50. The configuration of each power cable 50 is the same as that of the first embodiment. Unlike the rubber mold component 1 of the first embodiment, the rubber mold component 10 does not include an anti-slip portion. One of the features of the power cable connecting component 2 is that it includes an anti-slip mechanism 20 that suppresses the axial displacement of the sheath 56 due to thermal effects. Here, the anti-slip mechanism 20 includes a bracket 21 and a rubber spacer 25. Hereinafter, each configuration will be described in detail.

[Anti-slip mechanism]
(bracket)
The bracket 21 is attached to the outer peripheral surface of the rubber spacer 25 and tightens the rubber spacer 25 to apply a predetermined surface pressure to the sheath 56 via the rubber spacer 25. Moreover, the bracket 21 attaches a plurality of power cables 50 to an attachment target. The bracket 21 includes a main body 22, a pressing member 23, and a tightening member 24 (FIG. 3).

<Main body>
The main body 22 fixes the bracket 21 itself to an object to be attached, and includes a semicircular curved portion 22a, flange portions 22b formed on both sides of the curved portion 22a, and a fixing base formed on the outer surface of the curved portion. 22c. A rubber spacer 25 is disposed between the curved portion 22a and a curved portion 23a of a pressing member 23 described later. The flange portion 22 b is for fixing the pressing member 23 to the main body 22. The flange portion 22b is formed with an insertion hole (not shown) through which a later-described tightening member 24 is inserted. The fixing base 22c fixes the main body 22 to an attachment target. As an attachment object, a brace etc. are mentioned, for example. The fixing base 22c is formed with an insertion hole (not shown) through which a fixing member such as a bolt for fixing the main body 22 to the attachment target is inserted.

<Presser member>
The pressing member 23 is disposed to face the inner side surfaces of the curved portion 22 a and the flange portion 22 b of the main body 22, and a rubber spacer 25 is arranged between the main body 22 and presses the outer peripheral surface of the rubber spacer 25. The pressing member 23 includes a semicircular curved portion 23a and flange portions 23b formed on both sides of the curve. The curved portion 23 a is in contact with the outer peripheral surface of the rubber spacer 25 and presses the outer peripheral surface of the rubber spacer 25. The flange portion 23 b is fixed to the flange portion 22 b of the main body 22 with a fastening member 24. An insertion hole (not shown) through which the tightening member 24 is inserted is formed in the flange portion 23b.

<Tightening member>
The fastening member 24 fixes the main body 22 and the presser member 23 by integrally fastening the main body 22 and the flange portions 22 b and 23 b of the presser member 23. By this tightening, the curved portions 22 a and 23 a of the main body 22 and the pressing member 23 compress the rubber spacer 25 disposed between them, and a predetermined surface pressure is applied to the power cable 50. The fastening member 24 can be a bolt.

  The length of the bracket 21 along the axial direction is preferably slightly shorter than the total length of the rubber spacer 25 along the axial direction of the bracket 21 (FIG. 2).

(Rubber spacer)
The rubber spacer 25 is attached so as to apply a predetermined surface pressure to the outer peripheral surface of the sheath 56 of each power cable 50 and bundles the plurality of power cables 50. Here, the rubber spacer 25 bundles three-core (three-phase) power cables 50 together. The rubber spacer 25 is a cylindrical body, is formed along the axial direction of the rubber spacer 25, and is formed in a series in the storage hole 26 in which each power cable 50 is stored. It has a notch 27 for fitting the power cable 50 into the storage hole 26 (FIG. 3). The rubber spacer 25 has a high friction resistance portion 25 a in which the static friction coefficient μ ₃ between the rubber spacer 25 and the sheath 56 is larger than the static friction coefficient μ ₂ between the main body portion 11 (FIG. 1) and the sheath 56. The formation region of the high-friction resistance portion 25a in the rubber spacer 25 may be a region only in the vicinity of the accommodation hole 26 or may be a region over the entire rubber spacer 25. When the formation area of the high friction resistance portion 25a is an area only in the vicinity of the accommodation hole 26, the high friction resistance portion 25a and other portions of the rubber spacer 25 may be integrally formed or separable independently. May be formed. Here, the entire rubber spacer 25 is formed of the high friction resistance portion 25a.

The difference Δμ (μ ₃ −μ ₂ ) between the static friction coefficient μ ₃ between the high friction resistance portion 25 a (rubber spacer 25) and the sheath 56 and the static friction coefficient μ ₂ between the main body 11 and the sheath 56 is Like the above-mentioned Embodiment 1, 0.5 or more and 3.6 or less are preferable. The static friction coefficient μ ₃ between the high frictional resistance portion 25a and the sheath 56 is 1.1 or more and 4.1 or less as in the first embodiment. Examples of the material of the high friction resistance portion 25a (rubber spacer 25) include silicone rubber and urethane rubber similarly to the material of the anti-slip portion 15 described above.

The length L ₂ along the axial direction of the bracket 21 in the high frictional resistance portion 25a (rubber spacer 25), from the same reason as the high frictional resistance portion 15a of the first embodiment described above (slip section 15), for example, It is preferably 30 mm or more and 120 mm or less (FIG. 2). The length L ₂ is the length along the axial direction of the portion covered by the bracket 21. The predetermined surface pressure is applied to the sheath 56 via the high frictional resistance portion 25a, which is substantially covered with the bracket 21, that is, in terms of length, the length of the high frictional resistance portion 25a. Of this, only the length of the bracket. The length _{L 2} is more preferably not less than 110mm or less 35 mm, particularly preferably 45mm or more 60mm or less.

  The thickness of the high friction resistance portion 25a (rubber spacer 25) is preferably, for example, 0.5 mm or more and 5.0 mm or less for the same reason as the high friction resistance portion 15a (slip prevention portion 15) of the first embodiment described above. In particular, 2.0 mm or more and 3.0 mm or less are preferable. This thickness refers to the difference in diameter between the envelope circle of the three storage holes 26 and the outer periphery of the rubber spacer 25 (FIG. 3).

  It is preferable that the rubber spacer 25 has a flange portion formed at least on the outer peripheral edge on the front end side of the power cable 50 among both ends in the length direction. If it does so, since the movement to the shift | offset | difference direction of the sheath 56 of the rubber spacer 25 can be controlled by a collar part, the shift | offset | difference of the axial direction of the sheath 56 is easily suppressed effectively by the rubber spacer 25. This flange may also be formed on the outer peripheral edge of the other end of the rubber spacer 25.

[Usage]
The power cable connection part 2 according to the fifth embodiment can be suitably used as a power cable connection part including a rubber spacer and a bracket for constructing a terminal connection part of the power cable.

[Function and effect]
According to the power cable connecting component 2 according to the second embodiment, the anti-slip mechanism 20 is arranged so as to be displaced from the rubber mold component 10 and does not directly cover the end of the sheath 56 unlike the rubber mold component 10. , Provided near the end of the sheath 56. Therefore, the exposure from the sheath 56 (rubber mold component 10) of the shielding layer 55 in the power cable 50 can be suppressed as in the rubber mold component 1 according to the first embodiment.

  On the other hand, conventionally, a rubber spacer that is attached to the outer periphery of the sheath at the end of the power cable with a deviation from the rubber mold component and a bracket that is attached to the outer periphery of the rubber spacer, the longitudinal direction of the sheath due to thermal effects Cannot be suppressed, and exposure from the sheath (rubber mold component) of the shielding layer cannot be suppressed. This is because the conventional rubber spacer and bracket cannot increase the frictional force acting between the rubber spacer 25 and the sheath 56 as in this embodiment. The conventional rubber spacer is for filling the gap between the power cable and the bracket when the power cable is supported on the bracket, and does not have the high friction resistance portion 25a unlike the rubber spacer 25 of the present embodiment. . The conventional bracket is for supporting the power cable, and does not apply a predetermined surface pressure to the sheath 56 via the rubber spacer 25 unlike the bracket 21 of the present embodiment. The conventional rubber spacer is provided with a hook part at least on the front end side of the power cable, and the hook is hooked to the bracket so that the hook is hooked to the bracket with the hook part. Therefore, the rubber spacer does not fall off the bracket without compressing the spacer with the bracket and applying a surface pressure to the power cable.

《Test example》
The exposed state of the shielding layer inside the sheath was visually observed using the rubber mold component 1 having the anti-slip portion 15 described with reference to FIG.

In this test example, the anti-slip part was composed of a cylindrical synthetic rubber having a static friction coefficient μ ₁ between the anti-slip part and the sheath of 3.6. The length of the anti-slip part was 30 mm, and the thickness of the anti-slip part was 3.0 mm. The material of the main body was made of synthetic rubber having a static friction coefficient μ ₂ between the main body and the sheath of 1.7. The material of the sheath was polyethylene.

  Observation of the exposed state of the shielding layer was performed by arranging the power cable along the vertical direction in the vertical direction, adding a 10 kg weight to the sheath, and visually confirming it. As a result, the shielding layer was not exposed when a rubber mold part having a non-slip portion was used. For comparison, a part of the shielding layer was exposed as a result of performing the same test using a rubber mold part having no anti-slip part.

  The present invention is not limited to these exemplifications, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1, 10 Rubber mold part 11 Main body part 12 Mark 12a Protrusion 13 Electric field relaxation layer 15 Non-slip part 15a High friction resistance part 2 Power cable connection part 20 Non-slip mechanism 21 Bracket 22 Main body 22a Curved part 22b Flange part 22c Fixing base 23 Holding member 23a Bending portion 23b Flange portion 24 Tightening member 25 Rubber spacer 25a High friction resistance portion 26 Storage hole 27 Notch portion 50 Power cable 53 Insulator 55 Shielding layer 56 Sheath

Claims (11)

It is a rubber mold part attached to the end of the power cable,
The power cable includes a shielding layer and a sheath covering an outer periphery of the shielding layer,
The rubber mold component is
A cylindrical main body that grips the end of the sheath and applies a predetermined surface pressure to the sheath;
An anti-slip portion interposed between the sheath and the main body portion to suppress axial displacement of the sheath with respect to the shielding layer due to thermal effects;
The anti-slip part is a rubber mold part having a high friction resistance part in which a static friction coefficient between the anti-slip part and the sheath is larger than a static friction coefficient between the main body part and the sheath.   The rubber mold part according to claim 1, wherein the anti-slip portion has a cylindrical shape.   3. The rubber molded component according to claim 1, wherein a length along the axial direction of the rubber molded component in the anti-slip portion is 30 mm or more and 120 mm or less.   The rubber mold part according to any one of claims 1 to 3, wherein the anti-slip portion has a thickness of 0.5 mm or greater and 5.0 mm or less.   The rubber mold part according to any one of claims 1 to 4, wherein a surface of the inner peripheral surface of the main body portion without the anti-slip portion is flush with an inner surface of the anti-slip portion.   6. The rubber molded component according to claim 1, wherein either the inner peripheral surface of the main body portion or the inner surface of the anti-slip portion includes a mark indicating a folding position of the main body portion. . The inner peripheral surface of the main body includes the mark,
The rubber mold component according to claim 6, wherein the anti-slip portion is disposed between the opening end of the main body portion on the insertion side of the power cable and the mark.   The rubber molded component according to claim 7, wherein the main body is folded back with the mark as a base point.   The rubber mold part according to any one of claims 1 to 8, further comprising a cylindrical electric field relaxation layer integrally formed on an inner peripheral surface of the main body. The sheath that is disposed on the outer periphery of a plurality of power cables having a sheath having an end portion to which a main body portion of the rubber mold component is mounted and a shielding layer in the sheath is shifted from the rubber mold component and is affected by a thermal effect. Equipped with a non-slip mechanism that suppresses the axial displacement of
The anti-slip mechanism includes a rubber spacer that is attached so as to apply a predetermined surface pressure to the outer peripheral surface of the sheath of each power cable and bundles the plurality of power cables.
The rubber spacer is a power cable connecting part having a high friction resistance portion in which a static friction coefficient between the rubber spacer and the sheath is larger than a static friction coefficient between the main body portion and the sheath.   The electric power according to claim 10, wherein the anti-slip mechanism includes a bracket that is attached to an outer peripheral surface of the rubber spacer and tightens the rubber spacer to apply a predetermined surface pressure to the sheath via the rubber spacer. Cable connection parts.

Images