JPH1012290A - Compressive sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressive sleeve which can reliably prevent infiltration of rainwater or the like from outside by preventing leakage of a compound and is also excellent in connecting workability. SOLUTION: This sleeve is composed of a metallic cylindrical sleeve main body 21 having a conductor inserting hole 21a into which a led conductor 25a is inserted, a resinous cylindrical insulating covering member 22 which covers its outer periphery and has a cylindrical projecting part 23 and a resinous cylindrical gasket 24 fitted in the cylindrical projecting part 23. Here, a through hole 29 in which an insulating covering 25b of an electric wire 25 is arranged in an inserted condition is arranged in the gasket 24, and at least a single annular small diameter part 30 to be brought into close contact over the whole circumference with an outer peripheral surface of the insulating covering 25b of the inserted electric wire 25 and at least a single annular large diameter part 31 having a diametrical dimension larger than the small diameter part 30 adjacently arranged on the inmost side more than the small diameter part 30 forward in the inserting direction of the electric wire 25, are arranged on an inside surface of the through hole 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression sleeve, and more particularly to a compression sleeve used to connect two ends of two covered electric wires installed on a utility pole in abutting condition. .

[0002]

2. Description of the Related Art When ends of two overhead electric wires are connected to each other in a butt state, for example, a compression sleeve 1 having a structure shown in FIGS. 4 and 5 is conventionally used. In the compression sleeve 1, a partition wall 2 b that divides the conductor insertion hole 2 a left and right (axial direction) is press-fitted and arranged at the center of the conductor insertion hole 2 a of the sleeve main body 2. And
Two compartments 2c, 2 partitioned by the partition 2b
d is filled with a compound C in the form of a paste, and the compartments 2c, 2c, 2c are inserted into the openings 2e, 2f at both ends of the conductor insertion hole 2a.
The cap 3 for preventing the compound C filled in 2d from leaking to the outside and preventing moisture in the outside air from entering the sleeve body 2 has been attached. The compound C is obtained by mixing metal particles into grease as a main material, and improves the electric resistance of the electric wire connecting portion, the gripping force, the oxidation of the metal contact surface, the sleeve body 2 and the conductor 4 of the electric wire 4.
It is used for the purpose of preventing electrolytic corrosion when the material of a is different.

In order to connect the electric wire 4 using the compression sleeve 1, first, the caps 3 attached to both ends of the compression sleeve 1 are removed, and then, as shown in FIG. The conductor 4a exposed (exposed) by peeling off the coating 4b is connected to the opening 2 of the compression sleeve 1.
From e and 2f, the tip is inserted through the compound C into the compartments 2c and 2d until it hits the partition 2b. In this state, the outer periphery of the compression sleeve 1 is sequentially compressed from both ends in the longitudinal direction toward the center by a compression tool (not shown).

As a result, the sleeve body 2 is reduced in diameter and is sequentially pressed against the conductor 4a disposed therein, and the gap between the conductor 4a and the sleeve body 2 is filled with the compound C. The connection with the electric wire 4 is ensured. After that, the connection work was completed by covering the exposed portions of the compression sleeve 1 and the conductors 4a at both ends thereof with an insulating tape or an insulating cover (not shown).

[0005] However, in the above-mentioned compression sleeve 1,
There were the following problems. First, since the outer periphery of the compression sleeve 1 must be covered with an insulating tape or an insulating cover after the compression operation, the connection operation is complicated. Secondly, in the covering process performed by the insulating tape or the insulating cover after the compression of the compression sleeve 1, in order to effectively prevent infiltration of rainwater into the conductor insertion hole 2a of the compression sleeve 1, multiple layers are provided. It was necessary to wind it, and it was difficult to obtain stable waterproofness with a small number of turns.

As an additional problem, when the compression sleeve 1 is compressed, the compound C inside the compartments 2c and 2d may leak from the openings 2e and 2f, and it is necessary to wipe the compound C with a cloth or the like. Thus, the connection work was complicated. In particular, if the compound C adheres to clothes or surroundings, it is difficult to remove the compound C, and there is a problem that the working environment is deteriorated.

To eliminate such inconvenience, a compression sleeve 5 having the structure shown in FIG. 6 has been proposed. The compression sleeve 5 (Japanese Utility Model Application Laid-Open No. 60-62772) has a partition wall 6b at the center of the conductor insertion hole 6a of the sleeve body 6 for partitioning the conductor insertion hole 6a left and right (axial direction). . An insulating coating layer 7 is provided on the outer periphery of the sleeve body 6. The insulating coating layer 7 is formed in a tubular shape protruding outward in the longitudinal direction from both end openings 6c and 6d of the sleeve body 6, and a cap 8 is attached to an end of the insulating coating layer 7. I have. The cap 8 is attached to the end of the insulating coating layer 7 so as not to come off easily, and is located at the center of the cap 8 so that the electric wire 4 can be inserted into the conductor insertion hole 6a with the cap 8 attached. Electric wire 4
Has a thin film portion 8a that can be easily broken through.

To connect the electric wire 4 using the compression sleeve 5, the conductor 4 a of the electric wire 4 is connected to the thin film portion 8 a of the cap 8.
And pierce the thin film portion 8a as it is to
The compression sleeve 5 only needs to be compressed until it hits the end of the compression sleeve 5 from both ends in the longitudinal direction toward the center or from the center toward both ends in the longitudinal direction. Therefore, if the compression sleeve 5 is used, the sleeve body 6 is covered with the insulating coating layer 7, so that it is not necessary to perform another insulating coating after the connection.
Further, even if the conductor 4a extends outward in the axial direction due to the compression, the conductor 4a does not protrude outside the space 9 formed by the insulating coating layer 7 and the cap 8, and Fits. For this reason, since it is not necessary to wrap an insulating tape or cover an insulating cover on both ends in the longitudinal direction of the compression sleeve 5, the connection work is complicated.

Further, since the thin film portion 8a of the cap 8 pierced by the conductor 4a is arranged so as to close the space 9, the compound C in the conductor insertion hole 6a leaks to the outside when compressed. There is also an effect that rainwater can be prevented from entering from the outside to some extent.

However, the thin film portion 8 of the cap 8
Since a is penetrated by the conductor 4a,
The fracture surface is not constant, and it is difficult to make sure that it is in close contact with the insulating coating 4b of the electric wire 4. For this reason, leakage of the compound C and infiltration of rainwater cannot be reliably prevented.

Further, as shown in FIG. 6, since the end opening of the insulating coating layer 7 is covered with the cap 8, the space 9 and the conductors in the cap 8 are inserted before and during insertion of the electric wire 4. There is a disadvantage that the position and the like of the insertion hole 6a cannot be confirmed. In addition, in the example shown in FIG. 6, since the end face 6e of the sleeve body 6 protrudes radially inward from the inner face of the insulating coating layer 7, the tip of the inserted conductor 4a contacts the end face 6e of the sleeve body 6. It is possible to touch. Therefore, the worker gropings the conductor 4a.
It is necessary to insert the conductor 4a into the conductor insertion hole 6a while avoiding interference between the tip of the sleeve and the sleeve main body 2 and the like, and there is a disadvantage that workability is poor.

Further, in the case where the insulating coating layer 7 is provided with the sleeve main body 6 covered as described above, it is conceivable that a positional shift may occur between the sleeve main body 6 and the insulating coating layer 7 during the connection operation. In this case, there is a possibility that the compression position is mistaken or the number of times of compression is mistaken.

In order to avoid these disadvantages, the applicants have proposed a compression sleeve 10 having a structure shown in FIG. 7 in Japanese Patent Application No. 315842/1994.
According to the compression sleeve 10, a cylindrical protrusion 11 a is formed at both ends in the longitudinal direction of the insulating covering member 11 so as to protrude outward from the longitudinal end of the sleeve main body 12, and a tip is formed inside the cylindrical protrusion 11 a. The gasket 13 having a gradually decreasing diameter is inserted, and the small diameter portion 13a and the cylindrical projection 11a are inserted.
The space C that can accommodate the compound C that expands outward when the insulating coating member 11 and the sleeve body 12 are pressurized is provided between them, so that it is possible to effectively prevent the compound C from leaking when the electric wire is connected. There is an advantage that can be. In addition, since the inner surface of the gasket 13 is brought into close contact with the outer surface of the insulating coating 4b of the inserted electric wire 4, the effect of preventing penetration of rainwater, dust, and the like is high.

In the compression sleeve 10, a ring-shaped protrusion 15 for determining a compression position of a compression tool T for compressing the insulation coating member 11 and the sleeve body 12 is provided on an outer peripheral surface of the insulation coating member 11 at a desired interval. Therefore, the compression position and the number of times of compression are not mistaken or the compression position is not shifted. Further, an annular peripheral groove 12a is formed on the outer peripheral surface at a substantially central portion in the longitudinal direction of the sleeve main body 12, and covers the inner surface of the insulating covering member 11 in a state of being inserted into the peripheral groove 12a. Even if the covering member 11 is partially extended in the longitudinal direction of the sleeve body 12, the part of the insulating covering member 11 which is locked in the circumferential groove 12a at the substantially central portion in the longitudinal direction of the sleeve body 12 is torn. There is an advantage that the insulating coating member 11 is hardly displaced, displaced or detached, and the insulating coating member 11 is kept at a predetermined position.

[0015]

However, in the compression sleeve 10 having the above structure, the entire inner surface of the gasket 13 is brought into close contact with the outer surface of the insulating coating 4b of the electric wire 4, so that the fitting size is increased in order to enhance the waterproof effect. If the tolerance is strict, the sliding resistance when inserting the electric wire 4 increases, and there is a disadvantage that workability deteriorates. Grease G is applied to the inner surface of the gasket 13 to enhance the waterproof effect. However, the grease G is completely scraped off by the edge of the insulating coating 4b of the electric wire 4 into which the applied grease G is inserted. However, there is a possibility that the waterproof effect is reduced.

The present invention has been made in view of the above-described circumstances, and can prevent the compound C from leaking, reliably prevent intrusion of rainwater or the like from the outside, and improve the connection workability. It is intended to provide an excellent compression sleeve.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 is directed to a metal having a conductor insertion hole provided so as to allow insertion of a conductor of a covered electric wire and filled with a compound. A cylindrical sleeve main body, a resin cylindrical insulating covering member having a cylindrical projection covering the outer periphery of the sleeve main body and disposed outside in the longitudinal direction from an end surface of the sleeve main body; And a cylindrical gasket made of an elastic material disposed in a fitting state in the protruding portion. When the conductor of the electric wire is inserted into the conductor insertion hole, the insulating coating of the electric wire is formed on the gasket. At least one annular small-diameter portion is provided on the inner surface of the through-hole, which is disposed in the insertion state, and is provided on the inner surface of the through-hole so as to be in close contact with the outer peripheral surface of the insulating coating of the inserted wire. Said small towards At least one having a larger diameter than the small-diameter portion disposed adjacent to the small diameter portion on the rear side than the part
A compression sleeve having two annular large diameter parts is proposed.

The invention according to claim 2 proposes a compression sleeve in which the plurality of small-diameter portions are arranged at intervals in a longitudinal direction of the through hole in the compression sleeve.

According to a third aspect of the present invention, in the above-mentioned compression sleeve, the small-diameter portion comprises an annular projection protruding radially inward on an inner surface of the through hole, and is disposed on an end side of the insulating covering member. A compression sleeve is proposed in which a side surface to be formed is formed in a tapered surface shape whose diameter gradually decreases toward the front in the insertion direction of the electric wire.

The invention according to claim 4 proposes a compression sleeve in which the large-diameter portion is a peripheral groove formed on an inner surface of the through hole.

According to a fifth aspect of the present invention, in the compression sleeve, the small-diameter portion or the large-diameter portion is provided near an opening of the through-hole provided on an end portion side of the insulating covering member, In addition, a compression sleeve has been proposed in which an electric wire guide surface having a smooth surface is provided on the inner surface of the through hole arranged closer to the sleeve body than the small diameter portion or the large diameter portion.

Further, according to a sixth aspect of the present invention, in the compression sleeve, a tapered expanding surface is provided near the opening end of the conductor insertion hole so as to gradually increase its diameter in the longitudinal direction toward the opening end. At the same time, the diameter-expanding surface has proposed a compression sleeve in which the tip reaches the outer periphery of the sleeve main body and the spreading angle at the tip is the largest.

[0023]

According to the compression sleeve of the first aspect,
When a gasket is arranged in a fitted state on the cylindrical protrusion of the insulating covering member covering the sleeve body, and one end of the covered covered electric wire is inserted into a through hole of the gasket, the conductor of the covered electric wire becomes the gasket. Through the through hole, and inserted into the conductor insertion hole of the sleeve body inside the insulating covering member.
In addition, the insulating coating of the electric wire is arranged to be inserted into the through hole of the gasket.

In this case, since the annular small diameter portion is formed on the inner surface of the through hole, the small diameter portion is brought into close contact with the outer surface of the insulating coating of the electric wire over the entire circumference. Thereby, the space between the electric wire and the insulating covering member is securely sealed by the gasket, and leakage of the compound in the conductor insertion hole and intrusion of rainwater from the outside into the insulating covering member are avoided. On the other hand, since the inner surface of the through hole is provided with an outer diameter portion having a larger diameter than the small diameter portion, the contact area between the insulating coating of the electric wire and the inner surface of the gasket is reduced at this outer diameter portion. As a result, the sliding resistance of the electric wire with respect to the gasket is reduced, and the insertion force when inserting the electric wire into the insulating covering member can be reduced.

Also, since the large-diameter portion is disposed adjacent to the small-diameter portion at a position deeper than the small-diameter portion toward the front in the wire insertion direction, the insulating coating is separated from the inner surface of the through-hole at the large-diameter portion. . Therefore, an annular space is formed deeper than the small diameter portion, and if grease is applied when inserting the electric wire, the grease is held around the insulating coating without being scraped off by the insulating coating. Become.

According to the compression sleeve of the second aspect of the present invention, a plurality of small diameter portions are arranged at intervals on the inner surface of the through hole. Also, a large-diameter portion having a large diameter is provided, and has the same effect as described above. In addition, if grease is applied to the inside of the through hole of the sleeve when inserting the wire, the grease will be filled between the small diameter parts, and even if the wire is inserted into the through hole in this state, the grease will be covered by the insulation coating of the wire. It is maintained in a filled state between the small diameter portions without being scraped off. Therefore, it is possible to maintain high waterproofness between the through hole and the electric wire inserted therein.

According to the compression sleeve of the third aspect of the present invention, the side surface of the small-diameter portion formed of the annular projection, which is disposed on the wire entrance side, has a tapered surface shape whose diameter gradually increases toward the entrance side. Since it is formed, the tip of the small diameter portion does not bite into the insulating coating of the inserted electric wire, and the insertion force when inserting the electric wire into the insulating coating member can be further reduced.

Further, when the large-diameter portion is constituted by a peripheral groove, as in the compression sleeve according to the fourth aspect of the present invention, the contact area of the large-diameter portion with the electric wire is reduced. Can be easily inserted.
In addition, grease can be held in the large diameter portion formed by the circumferential groove,
The waterproof effect is enhanced.

According to the compression sleeve of the fifth aspect of the present invention, the small-diameter portion or the large-diameter portion is disposed near the opening of the through hole on the end side of the insulating covering member, that is, on the electric wire entrance side. Irregularities in the through holes can be visually checked from the outside. Thus, the operator can start the operation of inserting the electric wire while visually confirming the tip of the conductor so as not to be caught by these irregularities.

Further, since a wire guide surface having a smooth surface is provided on the inner surface disposed deeper than the small-diameter portion or the large-diameter portion in the through hole, the tip of the conductor is provided on the wire guide surface. By continuing the insertion work so that it can be slid, the insertion work can be carried out smoothly by reliably avoiding the wire getting caught inside the through hole, which cannot be observed from the outside due to the start of insertion of the wire Becomes

Further, according to the compression sleeve of the present invention, by providing the tapered enlarged surface near the opening end of the conductor insertion hole, the tip of the conductor inserted into the insulating covering member is provided. However, the insertion is prevented from being hindered by being caught on the end face of the sleeve. In addition, since the enlarged diameter surface is formed so that the divergence angle is maximized at the tip, the tip is prevented from being sharp, and the tip is damaged in a manufacturing process or the like, and the insulating coating member is damaged. Can be prevented.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a compression sleeve according to the present invention will be described in detail with reference to FIG. The compression sleeve 20 according to the present embodiment has a substantially cylindrical sleeve body 21.
And a substantially cylindrical insulating covering member 22 covering the outer periphery thereof
And a substantially cylindrical gasket 24 inserted into cylindrical protrusions 23 provided at both ends of the insulating covering member 22.

The sleeve body 21 is made of a metal material such as an aluminum alloy, and its length, outer diameter, inner diameter and the like are determined by the conductor 2 of the electric wire 25 to be connected.
It is appropriately set based on the outer diameter of 5a and other conditions. The sleeve body 21 has conductor insertion holes 21a opened at both ends in the longitudinal direction. At the longitudinal center of the conductor insertion hole 21a, there is provided a partition wall 21c for dividing the conductor insertion hole 21a into two compartments 21b (only one compartment is shown). The partition 21c
Is a method in which an aluminum plate formed in a disk shape slightly smaller than the inner diameter of the conductor insertion hole 21a is connected to the conductor insertion hole 21a.
After being inserted into the center of the sleeve body 21, it is crushed in the thickness direction by a dedicated tool to expand the diameter, and is locked at the center of the sleeve body 21.

The compartment 21 of the sleeve body 21
b is filled with an appropriate amount of a paste-like compound C obtained by mixing metal particles into grease. In this compound C, the conductor 25a of the electric wire 25 is
1c, when it is inserted deep into the conductor insertion hole 21a, it is filled in such an amount that it spreads over the entire conductor insertion hole 21a so as to fill the gap between the conductor insertion hole 21a and the conductor 25a. The sleeve body 21 to the conductor 25
When compressed together with a, the electrical resistance at the contact portion, the gripping force, the oxidation of the metal contact surface, the prevention of electrolytic corrosion when the material of the sleeve body 21 and the material of the conductor 25a are different, and the like can be achieved. I have.

The conductor insertion hole 21 of the sleeve body 21
A tapered enlarged surface 26 is provided at the open end of “a”. The enlarged diameter surface 26 includes, for example, a first enlarged diameter surface 26a and a second enlarged diameter surface 26b having different taper angles and continuing in the longitudinal direction. First enlarged surface 26a
Is formed so as to gradually decrease the diameter from the position of the outer peripheral surface of the sleeve main body 21 along the longitudinal direction of the conductor insertion hole 21a from the opening end, and the second enlarged diameter surface 26b is formed in the conductor insertion hole 21a. It is formed so as to gradually reduce the diameter at a taper angle smaller than that of the first enlarged-diameter surface 26a from a position which is separated from the opening end of the opening 21a by a certain distance in the longitudinal direction.

Thus, the sleeve main body 21 is configured so that the inserted electric wire 25 is easily guided into the conductor insertion hole 21a along the enlarged-diameter surface 26, as described later, The first enlarged diameter surface 26a having a larger taper angle than the enlarged diameter surface 26b prevents the end portion from having a sharp shape, thereby preventing damage to this portion in the manufacturing process or the like. . In addition, the expanded surface 2
The taper angle of 6 may be set to an arbitrary value. However, the first enlarged surface 26a has a taper angle of about 15 ° to 20 ° in order to improve the handleability of damage prevention. It is preferable to set the angle in a range of about 45 ° to 50 ° in order to ensure the ease of insertion.

The insulating covering member 22 is a plastic member for covering the outer peripheral surface of the sleeve main body 21 and can withstand a high voltage of about 6600 V AC.
The compression force of about 15 tons applied by the compression tool can be transmitted to the sleeve main body 21 to sufficiently deform the sleeve main body 21 and maintain sufficient electric and mechanical performance even after compression. It is configured to be able to.

This insulating covering member 22 is
Sleeve body 2 having a peripheral groove 21d formed in the outer periphery at the center in the longitudinal direction so as not to be displaced or slipped off with respect to the sleeve body 1.
1 is formed integrally with the sleeve body 21 by insert molding. By forming the peripheral groove 21d at the center in the longitudinal direction of the sleeve main body 21, when the insulating coating member 22 and the sleeve main body 21 are compressed by using a compression tool, the insulating coating member 22 partially covers the sleeve main body 21. Even if it is stretched in the longitudinal direction, the portion of the insulating covering member 22 that is locked by the circumferential groove 21d is not easily torn, displaced, or detached in the same direction.

On the outer peripheral surface of the insulating covering member 22, annular protrusions 22a are formed at predetermined intervals along the longitudinal direction of the sleeve main body 21. The protruding portions 22a are formed so as to be arranged on both sides of the compression position of the compression tool by the die T. And two protrusions 22
When the compression dies T are temporarily fixed between the positions a, the dies T are fixed at the positions, so that the dies T are not displaced in the subsequent main compression work.

Further, at both ends of the insulating covering member 22, there are formed cylindrical projecting portions 23 having both end portions projecting outward in the longitudinal direction from both ends in the longitudinal direction of the sleeve main body 21. The cylindrical projecting portion 23 is used to connect the conductor 25 a of the electric wire 25 which is led out as specified to the conductor insertion hole 21 of the sleeve body 21.
When inserted into a, the insulating coating 25b has a length that can sufficiently cover the remaining portion. In the drawing, reference numeral g is a display indicating the compression direction of the sleeve, reference numeral 27 is a positioning recess for positioning a gasket 24 described later, and reference numeral 28 is a positioning recessed gasket 24. It is a retaining projection for preventing the falling-out from falling off.

The gasket 24 is provided on the cylindrical projection 2.
3 is a member made of soft rubber. In addition, as a material of the gasket 24, any material such as a rubber having an arbitrary hardness or a resin such as a plastic may be selected in addition to the soft rubber. However, since the material of the gasket 24 particularly affects the insertion force of the electric wire 25, as long as other mechanical properties such as durability of the material are not hindered.
It is preferable to select a soft material.

The gasket 24 has a through hole 29 through which the electric wire 25 penetrates in the longitudinal direction. The gasket 24 comprises a substantially cylindrical tubular portion 24a and a small-diameter portion 24b having a tapered end. As a whole, it is formed in a tapered cylindrical shape. The gasket 24 has a cylindrical body 24a.
Is provided with a flange-like flange portion 24c fitted into the positioning concave portion 27 of the insulating covering member 22.

A ring-shaped projection 30 (small diameter portion) formed over the entire circumference of the through hole 29 is provided on the inner surface of the through hole 29 formed in the cylindrical portion 24a of the gasket 24. In the present embodiment, the protrusion 30 is, for example,
Three rows are provided at parallel intervals. As a result, a large diameter portion 31 having an inner diameter larger than the protrusions 30 is formed between the protrusions 30. The minimum diameter of the projection 30 is slightly smaller than the outer diameter of the insulating coating 25b of the electric wire 25, and is made to adhere to the insulating coating 25b of the inserted electric wire 25 over the entire circumference.

As shown in FIG. 2, these projections 30 are formed in a tapered surface shape in which the side surface 30a on the front side in the insertion direction of the electric wire 25 is gradually reduced in diameter in the same direction. On the other hand, the other side surface 30b is formed so as to be orthogonal to the longitudinal direction. As a result, an edge directed forward in the insertion direction of the electric wire 25 is formed at the inner peripheral edge of the projection 30, so that the edge does not act to penetrate into the insulating coating of the inserted electric wire 25, and the edge does not act. Thus, care is taken to prevent the insertion force of the electric wire 25 from being increased.

The projections 30 are provided near the opening end 29a of the through hole 29 on the flange portion 24c side. The inner surface of the through-hole 29 disposed on the inner side of the wire 30 in the insertion direction of the electric wire 25 with respect to the protrusions 30 is:
The smooth wire guide surface 32 eliminates irregularities that may hinder the insertion of the wire 25.

The gasket 24 thus formed is
The small-diameter portion 24b is fitted into the cylindrical projection 23 so that the small-diameter portion 24b is arranged on the inner side of the cylindrical projection 23. As a result, the flange portion 24c provided on the gasket 24 is positioned in contact with the positioning concave portion 27 of the insulating covering member 22, and is held by the retaining projection 28 so as not to fall off. The fitting tolerance between the gasket 24 and the insulating coating member 22 does not need to be set so strictly in consideration of the fact that the gasket 24 expands in the radial direction due to the insertion of the electric wire 25.

In the small diameter portion 24b of the gasket 24,
A slit 33 is formed, and the conductor 2 of the electric wire 25 inserted toward the conductor insertion hole 21a of the sleeve main body 21 is formed.
5a can smoothly penetrate the gasket. The outer peripheral surface of the small-diameter portion 24b defines an accommodating space portion 34 between the opposing inner peripheral surface of the cylindrical protruding portion 23. Compound C leaking from conductor insertion hole 21a
Is to be accommodated.

The operation of the compression sleeve 20 according to this embodiment having the above-described configuration will be described below. The compound C is filled in the conductor insertion hole 21a of the sleeve main body 21 covered with the insulating covering member 22, and the gasket 24 is opened in a state where the gasket 24 is fitted to the cylindrical projecting portion 23 of the insulating covering member 22. Through hole 29 from end 29a
Inside, the electric wire 25 with the conductor 25a is inserted. At this time, grease G is sufficiently applied to the inner surface of the through-hole 29, particularly to the portion where the annular projection 30 is formed.

The conductor 2 of the electric wire 25 inserted into the through hole 29
5a is first passed through three rows of projections 30 formed on the inner surface of the through hole 29. These projections 30
Is formed near the opening end 29a of the through hole 29, so that it can be easily seen from the outside. Therefore, the operator may recognize that the tip of the conductor 25a of the electric wire 25 is
The wire 25 can be inserted while checking that the wire 25 is not caught.

Once the tip of the conductor 25a passes through the portion where the protrusion 30 is formed, the inner surface of the through hole 29 at the back thereof forms a smooth wire guide surface 32.
5a is the sleeve body 21 without being hindered from being inserted.
Will be guided to the open end. Also, since the tapered diameter-increased surface 26 is provided at the open end of the conductor insertion hole 21a of the sleeve main body 21, the tip of the conductor 25a is inserted into the conductor insertion hole 21a along the diameter-increased surface 26. You will be guided to. Therefore, unlike the related art, there is no trouble of inserting the conductor 25a while groping to avoid interference between the tip of the conductor 25a and each member inside the insulating covering member 22, and the inserted conductor 25a is smoothly inserted into the conductor insertion hole 21a. Will be led to.

The conductor 25a of the electric wire 25 is
When the wire 25 is inserted to some extent, the insulating coating 25b of the electric wire 25 starts to be inserted into the through hole 29 from the open end 29a of the gasket 24. The end of the insulating coating 25b first comes into contact with the projection 30 on the inner surface of the through hole 29, and the contacting side surface 30a is formed in a tapered surface shape. Along with the projection 30 so that the projection 30 can be easily passed. The projections 30 are provided in three rows at parallel intervals, but the operation of each projection 30 is the same.
Can be easily passed through.

In this case, since the large-diameter portion 31 having a larger diameter than the projections 30 is formed between the projections 30, the insulating coating 25 inserted into the through hole 29 is formed.
The b is mainly inserted in a state of being in close contact with the inner peripheral edge of the projection 30, and the contact pressure with the large-diameter portion 31 and portions other than the projection 30 is reduced. As a result, the insertion force of the electric wire 25 is greatly reduced as compared with the case where the entire through-hole 29 is brought into close contact with the outer peripheral surface of the insulating coating 25b, and the insertion work becomes easy. On the other hand, since the contact area between the projection 30 and the insulating coating 25b is small, increasing the contact pressure in this portion does not significantly affect the insertion force.
Therefore, it is possible to increase the waterproof effect while reducing the insertion force.

The projections 3 are located between the projections 30.
Since the large-diameter portion 31 whose outer diameter is larger than 0 is formed, the grease G applied before the insertion of the electric wire 25 is filled in the large-diameter portion 31 between these projections 30. Moreover, since the insulating coating 25b of the electric wire 25 is inserted so as to ride on the protrusion 30, the grease G filled in the large diameter portion 31 is not completely scraped off by the inserted insulating coating 25b. , Between the projections 30. Therefore, the waterproof effect can be further enhanced by surrounding the insulating coating 25b with the grease G disposed between the protrusions 30 over the entire circumference.

Then, by inserting the electric wire 25 until the end of the conductor 25a hits the partition 21c, the compound C filled in the conductor insertion hole 21a is removed.
It is pushed out by 5a and leaks out from the conductor insertion hole 21a. However, since the accommodation space 34 is formed outside the conductor insertion hole 21a, the compound C stops in the accommodation space 34, and is prevented from leaking outside the gasket 24. Gasket 24
Since the slit 33 is formed in the small diameter portion 24b, a small amount of the compound C may leak out into the through hole 29 through the slit 33, but the gap between the gasket 24 and the insulating coating 25b is considered. Since it is tightly closed by the projection 30, the compound C is reliably prevented from leaking to the outside.

The slit 33 of the gasket 24
May be formed so that the cut portion is connected by a thin film. In this case, the compound C from the slit 33 portion is formed.
Leakage can be reliably prevented. In addition, the gasket 24 may not have any slit.

In the above-described embodiment, three rows of annular projections 30 are provided on the inner surface of the through hole 29 of the gasket 24. Alternatively, one or two or four or more rows of annular projections 30 may be provided. The protrusion 30 may be provided. When the projections 30 are arranged in one row, the grease is held on the back side of the projections 30 toward the front in the insertion direction of the electric wire 25, and thus has the same waterproof effect as described above. Thus, a more stable waterproof effect can be obtained. Further, the fitting tolerance of the three rows of projections 30 with the insulating coating 25b may be the same, but in consideration of the case where a bending force acts on the electric wire 25 outside the gasket 24, the fitting of the projections 30 on the opening end side is considered. You may comprise so that fitting tolerance may be made a little tight.

In place of the annular projection 30 provided on the gasket 24, one or more rows of circumferential grooves 35 may be provided on the inner surface of the through hole 29 as shown in FIG. In this case, the inner surface of the through hole 29 becomes the small diameter portion 36 and the inside of the peripheral groove 35 becomes the large diameter portion.
Since the contact area between the outer periphery and the through hole 29 is reduced and the sliding resistance is reduced, the insertion force can be reduced, and the waterproof effect can be enhanced by containing grease in the circumferential groove 35.

The conductor insertion hole 21 of the sleeve body 21
Although the diameter-increased surface 26 composed of two steps of tapered surfaces is provided at the open end of the a, instead of this, three or more steps of tapered surfaces,
Alternatively, a diameter-enlarging surface 26 formed of a curved surface having a continuously expanding angle may be provided.

[0059]

As described above in detail, according to the compression sleeve of the first aspect of the present invention, the contact area between the insulating coating of the electric wire and the gasket is formed by the annular large diameter portion provided on the inner surface of the gasket through hole. Is reduced, the electric wire can be inserted with a small force, and the workability of the insertion operation can be improved. In addition, since the annular small diameter portion provided on the inner surface of the through hole comes into contact with the insulating coating of the electric wire with a small contact area, if the fitting is tight and the contact pressure is increased, the sliding resistance is not increased so much. This has the effect of improving the sealing between the components and effectively preventing leakage of the internal compound and intrusion of rainwater from the outside.

Moreover, since the large-diameter portion is disposed farther forward than the small-diameter portion in the insertion direction of the electric wire, if the large-diameter portion is coated with grease prior to insertion, the grease can be reduced in diameter. Since the portion serves as a barrier, the portion is not completely scraped off by the insulating coating, but is left applied to the large diameter portion. Therefore, between the inner surface of the through hole of the gasket and the insulating coating of the electric wire inserted into the through hole,
An annular grease layer is formed, which can greatly enhance the waterproof effect.

According to the compression sleeve of the second aspect of the present invention, a large diameter portion is formed between each of the plurality of small diameter portions arranged at intervals in the longitudinal direction of the through hole, The aforementioned sliding resistance can be reduced, the sealing performance can be improved, and the waterproof effect of grease can be further improved.

According to the compression sleeve according to the third aspect of the present invention, since the small diameter portion is constituted by the projection, the same effect as described above can be obtained. In this case, even if a projection is formed in the through hole, the side surface of the projection is formed in a tapered surface shape, so that the electric wire runs inside the through hole so as to ride on the projection along the tapered surface. And the workability of the insertion operation can be prevented from being impaired.

According to the compression sleeve according to the fourth aspect of the present invention, since the large-diameter portion is constituted by the circumferential groove, the same effect as described above can be obtained with a very simple configuration.

According to the compression sleeve of the fifth aspect of the present invention, the unevenness such as the small diameter portion is provided near the opening of the through hole, so that the operator can easily visually confirm the position of the unevenness. be able to. Thereby, when inserting the electric wire, the operator can easily avoid the interference between the tip of the electric wire and these irregularities, and can start the insertion of the electric wire. In addition, since the wire guide surface having a smooth surface shape is provided on the back side of these irregularities toward the front in the wire insertion direction, the worker only applies the insertion force without worrying about interference. Thus, there is an effect that smooth insertion can be performed.

According to the compression sleeve of the sixth aspect of the present invention, by providing the sleeve body with the tapered enlarged surface, it is possible to prevent the end face of the sleeve body from hindering the insertion of the electric wire. By maximizing the divergence angle at the tip, it is possible to avoid the tip from becoming sharp and to simplify the handling.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a compression sleeve according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view showing a part of a gasket of the compression sleeve of FIG.

FIG. 3 is a longitudinal sectional view showing a modification of the gasket of FIG.

FIG. 4 is a perspective view showing an example of a conventional compression sleeve.

FIG. 5 is a perspective view showing a state where an electric wire is inserted into the compression sleeve of FIG. 5;

FIG. 6 is a longitudinal sectional view showing another example of a conventional compression sleeve.

FIG. 7 is a longitudinal sectional view showing still another example of the conventional compression sleeve, in which (a) is a state before an electric wire is inserted,
(B) has shown the state which inserted the electric wire, respectively.

[Explanation of symbols]

 C Compound 20 Compression sleeve 21 Sleeve body 21a Conductor insertion hole 22 Insulation coating member 23 Cylindrical protrusion 24 Gasket 25 Electric wire 25a Conductor 25b Insulation coating 26 Large diameter surface 29 Through hole 30 Projection (small diameter portion) 30a Side surface 31 Large diameter portion 32 Wire guide surface 35 Circumferential groove (Large diameter part) 36 Small diameter part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuaki Nasu, 2-82 Watanabe-dori, Chuo-ku, Fukuoka City, Fukuoka Prefecture Inside Kyushu Electric Power Co., Inc. 1 Nippon FCI Inc.

Claims (6)

[Claims] 1. A metal cylindrical sleeve main body having a conductor insertion hole filled with a compound and provided with a conductor exposed from a covered electric wire, and covering the outer periphery of the sleeve main body and the sleeve main body A resin-made cylindrical insulating covering member having a cylindrical protrusion disposed on the outer side in the longitudinal direction from the end face of the resin, and a cylindrical gasket made of an elastic material fitted in the cylindrical protrusion in a fitted state. When the conductor of the electric wire is inserted into the conductor insertion hole, the gasket is provided with a through-hole for disposing an insulating coating portion of the electric wire in an inserted state, and is inserted into the inner surface of the through-hole. At least one annular small-diameter portion that is brought into close contact with the outer peripheral surface of the insulating coating of the electric wire over the entire circumference, and the small-diameter portion is disposed adjacent to the small-diameter portion on the inner side of the small-diameter portion toward the front in the insertion direction of the wire Greater than At least one annular compression sleeve, characterized in that the large-diameter portion is provided in having a diameter. 2. The compression sleeve according to claim 1, wherein a plurality of the small diameter portions are arranged at intervals in a longitudinal direction of the through hole. 3. The small-diameter portion comprises an annular projection protruding inward in a radial direction on an inner surface of the through hole, and a side surface disposed on the front side toward the front in the insertion direction of the electric wire faces in the same direction. 3. The compression sleeve according to claim 1, wherein the compression sleeve is formed in a tapered surface shape whose diameter gradually decreases. 4. The compression sleeve according to claim 1, wherein the large-diameter portion is a peripheral groove formed on an inner surface of the through hole. 5. The small-diameter portion or the large-diameter portion is provided near an opening of the through-hole disposed on an end side of the insulating covering member, and the sleeve is larger than the small-diameter portion or the large-diameter portion. The compression sleeve according to any one of claims 1 to 4, wherein a wire guide surface having a smooth surface shape is provided on an inner surface of the through hole provided on the main body side. 6. A tapered enlarged surface gradually increasing in a longitudinal direction toward the open end is provided near an open end of the conductor insertion hole, and the distal end of the enlarged diameter surface is a sleeve. 2. The method according to claim 1, wherein the outer periphery of the main body is formed and the divergent angle at the tip is the largest.
The compression sleeve according to any one of claims 1 to 5.