JP5366997B2 - Insulated terminal cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insulation terminal cover capable of easily applying insulation coating processing to a connection terminal, and easily removing a member insulation-coating the connection terminal. <P>SOLUTION: An insulation terminal cover 1 coating internal conductors comprises connection terminal parts 40 between coated wires having connecting terminals 42, whose base ends 44 are connected to internal conductors 52 projecting from ends of two coated wires 50 respectively, and that have connecting holes 48 at tips 46, a bolt 54 inserted in the two communicated connecting holes, and a nut 56 screwed with the bolt to electrically and mechanically fix the two connecting terminals; an intermediate enclosure part 12 surrounding the connection terminal parts; and an internal conductor enclosure part 14 communicated with both ends of the intermediate enclosure part and entirely coating each exposed internal conductor. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to an insulating terminal cover that insulates a connection terminal portion in which two covered electric wires are connected by a connection terminal, and more particularly to an insulating terminal cover that can be easily covered with an insulating material and is detachable.

FIG. 5 is an exploded perspective view showing an example of a method for electrically and mechanically connecting the ends of two covered electric wires. The connecting terminal portion 140 shown in the figure connects the connecting terminals 142 having the base end portion 144 connected to the inner conductor 152 protruding from the end portion of each covered wire 150 and having the connecting hole 148 in the tip end portion 146. It is screwed by using a bolt 154 and a nut 156 in a state where the working hole 148 is in communication. In addition, it is a conductor except the coating | coated part of the covered electric wire 150. FIG.
If the connection terminal part 140 connected in this way is exposed, there is a possibility of causing an electric shock accident, a ground fault, a short-circuit accident, etc. when a part of a human body or a tool is accidentally contacted. Often, 140 is insulated (sealed). FIG. 6 is a perspective view showing a sealed state of a conventional connection terminal portion. Conventionally, in order to insulate the connection terminal portion 140, the insulation tape 160 is wound around the connection terminal portion in layers.

However, when the connection terminal portion is exposed for some reason after the insulating coating, it is necessary to remove the insulating tape. When the wound insulating tape is fixed due to secular change and is difficult to peel off from the connection terminal portion, there is a problem that workability is deteriorated. In addition, since the insulating tape is peeled off once, there is a risk that an electric shock accident or the like may occur due to the blade coming into contact with the connection terminal portion when making a cut at an appropriate position of the insulating tape.
As an invention for preventing such a problem, Patent Document 1 in which an invention of a terminal cover for insulatingly covering a connection portion between a power supply terminal and a lead wire (covered electric wire) is described. The terminal cover has a cover body made of a large-diameter cylindrical body surrounding the connecting portion on one end side, and a lead wire lead-in portion made of a small-diameter cylindrical body surrounding the lead wire on the other end side. Provided, and the internal space between the cover body and the lead wire lead-in portion communicates. Cover the connection part by inserting the lead wire into the terminal cover, temporarily shifting the terminal cover to the lead wire side, electrically connecting the lead wire and the power supply terminal electrically, and then connecting the terminal cover to the connection part side. It is performed in the procedure of moving to. Moreover, in order to open the connection portion, it is only necessary to move the terminal cover to the lead wire side, and the workability is good and there is little risk of an electric shock.

JP 2008-206379 A

However, the terminal cover described in Patent Document 1 is a cover corresponding to a configuration having a connection terminal portion only on one end side of the covered electric wire, and in the case of a connection form having a connection terminal portion in the middle portion of the two covered electric wires. However, this terminal cover cannot be applied directly.
The present invention has been made in view of the above-described circumstances, and can perform an insulating coating process on the connection terminal portion easily, and can easily remove a member that covers the connection terminal portion. An object is to provide a terminal cover.

In order to solve the above-mentioned problems, the invention according to claim 1 has a base end portion connected to each of the internal conductors protruding from the end portions of the two covered electric wires, and a connection hole at the tip end portion. A connecting terminal, a bolt inserted into the two connecting holes communicated, and a covered electric wire provided with a nut that is electrically and mechanically fixed to the two connecting terminals by being screwed to the bolt. An insulating terminal cover for covering the connection terminal portion and the inner conductor, the intermediate surrounding portion surrounding the connection terminal portion, and the entire inner conductors connected to and exposed at both ends of the intermediate surrounding portion; An inner conductor surrounding portion to be covered, and the intermediate surrounding portion and the inner conductor surrounding portion are formed of a double-folded cover member that sandwiches and covers the connection terminal portion and the inner conductor, Close the member freely As latching mechanism, characterized by comprising a closure ring for adhering the edge portions of the cover member hooked to the intermediate surrounding portion.
According to the first aspect of the present invention, at least two screwed portions using the bolts and nuts are surrounded by the intermediate surrounding portion when covering the two covered electric wires connected using the connecting terminals, the bolts and the nuts. The inner conductor extending from both ends of the nut is covered with an inner conductor surrounding portion whose inner diameter is smaller than that of the intermediate surrounding portion .
In addition , since the connection terminal portion and the inner conductor are sandwiched and covered, even if the connection terminal portion larger than the peripheral diameter of the covered wire is provided between the two covered wires, the insulation coating is easily performed. be able to.

Moreover , since the cover member can be freely opened and closed and is closed by the latching mechanism, the insulated state can be maintained without exposing the conductor after the terminal cover is mounted .
Also, just hook closure ring, it can be easily closed cover member.

The invention according to claim 2, characterized by terminal cover according to claim 1, further comprising a seal line to maintain the latching state by the closed stop ring by attaching entangled in the closure ring.
In the invention of claim 2 , since the sealing can be performed using the closing ring, the sealing work by the sealing line can be surely performed .
請 Motomeko invention described in 3, and at least one of said terminal cover according to claim 1 or 2, wherein a current transformer connectors meter of said two covered wires.
In the invention of claim 3 , the insulated terminal cover of the present invention is applied to the connecting portion of the measuring instrument current transformer and the covered electric wire. Since an instrument current transformer handles a large current, it is important to reliably insulate a connection portion between the instrument current transformer connector and the covered electric wire. On the other hand, when replacing the current transformer for an instrument, it is necessary to peel off the insulation coating, and a configuration that can be easily opened is also necessary. The insulated terminal cover of the present invention can satisfy any requirement, and is particularly suitable for insulatingly covering the connecting portion between the connector of the current transformer for the instrument and the covered electric wire.

  According to the present invention, since the connection terminal portion and the entire exposed internal conductor are covered with the dedicated terminal cover having the intermediate surrounding portion and the inner conductor surrounding portion, the conductor portion can be easily and reliably surrounded. In addition, there is no risk of sticking like an insulating tape, and workability and safety are improved.

It is a schematic diagram which shows the connection state of the covered electric wire and lead wire of the instrument transformer to which the insulated terminal cover of this invention is applied. It is a disassembled perspective view of the insulated terminal cover and connection terminal part which concern on 1st embodiment of this invention. It is the front view which showed a mode that the connection terminal part was enclosed by the insulated terminal cover. (A), (b) is sectional drawing of the internal conductor surrounding part which has a latching mechanism which concerns on 2nd embodiment of this invention. It is the disassembled perspective view which showed an example of the method of electrically and mechanically connecting between the edge parts of two covered electric wires. It is a perspective view which shows the sealing state of the conventional connection terminal part.

[First embodiment]
Hereinafter, embodiments of the present invention will be described in detail. First, an example of the place where the insulated terminal cover of the present invention is used is shown, and then the insulated terminal cover of the present invention will be described.
FIG. 1 is a schematic view showing a connection state of a covered electric wire and a lead wire of an instrument transformer to which an insulated terminal cover of the present invention is applied. The insulated terminal cover according to the present invention covers, for example, a connection portion between a connector (covered wire) of a current transformer for an instrument as shown in FIG. 1 and a primary side wire (covered wire) of a current transformer for the instrument. Used when Hereinafter, an example of a current transformer for an instrument will be described, but this is only an example for explaining the present invention.
The illustrated current transformer (current transformer 100) includes a power supply side connector 102 to which a primary side (power supply side) electric wire is connected and a load side connection to which a secondary side (load side) electric wire is connected. The device includes a child 104 and changes the current flowing from the power supply side to a size that can be used on the load side.
A power supply side wire 110 is electrically and mechanically connected to the power supply side connector 102 at a power supply side connection terminal portion 112, and a load side load side wire 120 is connected to a load side connection terminal of the load side connector 104. The part 122 is electrically and mechanically connected. Furthermore, the current transformer 100 includes an instrument terminal 106 for connecting to an instrument with a current transformer such as a watt hour meter (multiplier meter: not shown), and each instrument terminal 106 includes an instrument with a current transformer. The lead wire 130a is connected. Moreover, the lead wire 130 b of the instrument with a current transformer is connected to the power supply side connection terminal portion 112 together with the power supply side electric wire 110. In the illustrated current transformer 100, a current for measurement is taken out from the lead wire 130a, and a voltage for measurement is taken out from the lead wire 130b, which is used for measuring the amount of power by a meter with a current transformer.

The power supply side electric wire 110, the load side electric wire 120, the power supply side connector 102, and the load side connector 104 are all covered electric wires, and these electric wire ends are connected for connection with other covered electric wires. Terminals (see FIG. 2) are provided. Both the power supply side connection terminal portion 112 and the load side connection terminal portion 122 are covered with the insulating terminal cover (terminal cover 1) according to the present embodiment.
A large current flows through the primary side of the current transformer 100. In order to prevent an electric shock accident, a short circuit, or a ground fault, a connection portion between the power supply side connector 102 and the power supply side electric wire 110 of the current transformer 100 is used. It is important to reliably insulate a certain power supply side connection terminal portion 112. On the other hand, when the current transformer 100 is replaced, it is necessary to peel off the insulation coating, and a configuration that can be easily opened is also required. The terminal cover 1 according to the present embodiment satisfies all requirements, and is particularly suitable for insulatingly covering the connection terminal portion on the power source side of the current transformer for instrument.

  FIG. 2 is an exploded perspective view of the insulating terminal cover and the connection terminal portion according to the present embodiment. The insulated terminal cover according to the present embodiment includes an intermediate surrounding portion that covers the connection terminal portions that are connected to each other of the coated wire ends, and an inner conductor surrounding portion that surrounds the entire inner conductor of the covered wire at both ends of the intermediate surrounding portion. , Is characterized by having. Each covered electric wire may be any of the power supply side electric wire 110, the load side electric wire 120, the power supply side connector 102, and the load side connector 104 shown in FIG. Therefore, in the following description, it demonstrates, without distinguishing the power supply side connection terminal part 112 and the load side connection terminal part 122. FIG. Moreover, like the power supply side connection terminal part 112 shown in FIG. 1, when connecting a some electric wire to one connection terminal part, it connects with the other electric wire beforehand with one electric wire, Enclose all at once in the conductor enclosure.

First, the structure of the connection terminal part 40 coat | covered with a terminal cover is demonstrated.
The connection terminal 42 constituting the connection terminal portion 40 is a conductor having a base end portion 44 connected to the internal conductor 52 protruding from the end portion of the covered electric wire 50 and a connection hole 48 in the distal end portion 46. The connection of the connection terminal 42 to the inner conductor 52 is performed by, for example, crimping.
The connection terminal portion 40 includes two connection terminals 42, a bolt 54 made of a conductor inserted into the two connection holes 48 communicated, and the two connection terminals 42 by being screwed to the bolts 54. And a nut 56 made of a conductor that is fixed electrically and mechanically. That is, the connection terminal portion 40 has a columnar portion whose axial direction is the screw portion of the bolt 54. If necessary, a washer (not shown) may be provided.
As described above, the connection terminal portion 40 having a larger peripheral diameter than the covered electric wire 50 exists between the two covered electric wires 50.

Next, the terminal cover will be described. The terminal cover 1 includes an intermediate surrounding portion 12 that surrounds the connection terminal portion 40, and an inner conductor surrounding portion 14 that is connected to both ends of the intermediate surrounding portion 12 and covers the entire exposed inner conductor 52. Yes. Hereinafter, the connection terminal portion 40 and the entire inner conductor 52 are collectively referred to as a conductor exposed portion 60.
In the axial direction of the terminal cover 1, a slit 16 for attaching / detaching the conductor exposed portion 60 is formed continuously over the inner conductor surrounding portion 14, the intermediate surrounding portion 12, and the inner conductor surrounding portion 14. The terminal cover 1 has a configuration in which a front cover member 18 that surrounds the front side of the conductor exposed portion 60 in the figure and a back cover member 20 that surrounds the back side face each other with a slit 16 in between. The front cover member 18 and the back cover member 20 are continuously provided on the bottom surface side (lower side in the figure). That is, the terminal cover 1 is a cover member that is configured to be foldable and openable with the bottom portion as a hinge portion, and covers the conductor exposed portion 60 with the front cover member 18 and the back cover member 20 sandwiched therebetween.
On the outer surface of the intermediate surrounding portion 12 (front cover member 18), a closing ring 22 (holding mechanism) for closing the slit 16 in a state of covering the conductor exposed portion 60 is fixed, and the closing ring 22 when the slit 16 is closed. A ring holding recess 24 for stably holding the position is formed. Further, a sealing wire 26 is wound around the closing ring 22 to seal the terminal cover 1 and prevent it from being unnecessarily opened.

The terminal cover 1 is formed from an insulator such as rubber or polyethylene. You may form from a non-flexible insulator. In this case, for example, it is necessary that the bottom surface portion is made of a flexible material so that at least the slit 16 can be opened and closed. That is, when the terminal cover 1 is closed and when the conductor exposed portion 60 is attached / detached, the opening width of the slit 16, that is, the distance between the opposing edges of the front cover member 18 and the back cover member 20 is made variable.
In FIG. 1, one (one phase) current transformer is representatively shown. However, in the case of a three-phase three-wire system, a single-phase three-wire system, or the like, a plurality of current transformers are provided in the instrument box. Are arranged side by side, it is desirable to color-code the terminal cover 1 or to clearly indicate characters and symbols indicating the phase order so that the phase can be visually identified.
The intermediate surrounding portion 12 has a column shape that can surround the intermediate portion of the connection terminal portion 40, and has a length that can surround the entire axial direction of the bolt 54. And it has the protrusion part 28 in the side (upper figure in the figure) in which the slit 16 was formed.

The inner conductor surrounding portion 14 is a portion that at least surrounds the inner conductor 52 exposed for crimping to the base end portion 44. In order to prevent an electric shock accident, a ground fault, and the like after the enclosure, it is desirable that the covering portion of the covered electric wire 50 has a length that can cover about 1 cm as well as the inner conductor 52. That is, the axial length is set so that the inner conductor surrounding portion 14 is wrapped around the covering portion of the covered electric wire 50.
The closing ring 22 is an annular member having elasticity such as rubber, and prevents the opening of the slit 16 by bringing together the portion of the front cover member 18 and the portion of the back cover member 20 constituting the protruding portion 28. That is, by closing the closing ring 22 fixed to the front cover member 18 on the outer surface of the back cover member 20, the edge portions 18a and 20a of the front cover member 18 and the back cover member 20 are brought into close contact with each other (see FIG. 3). ).
The sealing wire 26 is preferably a wire such as a copper wire or an iron wire so as not to be easily cut, but other materials may be used.

A method of enclosing the connection terminal portion with the insulating terminal cover will be described with reference to FIGS. FIG. 3 is a front view showing a state in which the connection terminal portion is surrounded by the insulating terminal cover.
First, the slit 16 is opened wide and the conductor exposed portion 60 is surrounded by the terminal cover 1. At this time, the end edge portion 18 a of the front cover member 18 is overlapped and brought into close contact with the end edge portion 20 a of the back cover member 20. Then, the closing ring 22 is returned from the front side to the back side, and hooked and fixed to the ring holding recess 24 formed in the intermediate surrounding portion 12 portion of the front cover member 18. Further, the sealing wire 26 is wound around the terminal cover 1 and sealed with a caulking ball 30 or the like to complete the operation. At this time, the sealing wire 26 is entangled with the closing ring 22 so that the hooked state by the closing ring 22 can be maintained. Further, by using the sealing wire 26, the inner conductor surrounding portion 14 can be brought into close contact with the covered electric wire 50.
Moreover, when removing the terminal cover 1, the sealing wire 26 should be cut | disconnected and the latching state of the closure ring 22 latched by the back surface cover member 20 should just be cancelled | released, and it can remove easily.

As described above, according to the present embodiment, since the connection terminal portion is only covered with the insulating terminal cover and fixed with the closing ring, the conductor is not exposed after the terminal cover is mounted, and the insulating state is maintained. Can do. In addition, the working time can be shortened compared to the conventional method of winding the insulating tape a plurality of times. Further, since the insulated terminal cover can be easily removed, the risk of electric shock when the insulated terminal cover is removed is reduced. In addition, since the adhesive material is not used unlike the insulating tape, the adhesive material does not stick to the connection terminal part, and the connection part can be easily confirmed at the time of inspection, repairing the fault, etc. Line polishing is not required when reconnecting after disconnecting the part. Moreover, since it can seal using a closing ring, the sealing construction by a sealing line can be performed reliably. Further, unlike the insulating tape, there is no possibility of peeling off, so that when the sealing wire is made of metal, it is possible to prevent a short circuit, a ground fault, etc. due to contact with the connection terminal portion.
In this embodiment, the example of the insulating terminal cover in which the closing ring is fixed to the intermediate surrounding portion in advance has been described. However, the closing ring may be a separate body and the slit may be closed by retrofitting. Further, the sealing line may be configured separately as in the case of the closing ring.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIG. This embodiment is characterized in that the slit can be opened and closed without using a closing ring and a sealing line. 4A and 4B are cross-sectional views of the inner conductor surrounding portion having the latching mechanism according to the present embodiment. The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 4A, a latching claw 74 is formed at the circumferential end of the inner conductor surrounding portion 70 in the front cover member 72 side, and a latching claw 74 is formed on the outer surface of the back cover member 76. A plurality of hooked portions 78 to be hooked are formed. After surrounding the covered electric wire 50, the inner conductor surrounding portion 70 can be fixedly closed without using a sealing wire by hooking the hooking claw 74 on the hooked portion 78. Further, when the inner conductor surrounding portion 70 is opened, the hooked state between the hooking claw 74 and the hooked portion 78 may be released, and the inner conductor surrounding portion 70 can be easily opened. By selecting the hooked portion 78 according to the thickness of the surrounding covered electric wire 50, the outer surface of the covered electric wire 50 can be brought into close contact with the inner surface of the inner conductor surrounding portion 70.

  Moreover, you may use a latching mechanism as shown in FIG.4 (b). That is, the front cover member 82 of the inner conductor surrounding portion 80 has a plurality of latch holes 84, and the rear surface cover member 86 has a projection projection 88 that projects the latch holes 84. Yes. After surrounding the covered electric wire 50, the inner conductor surrounding portion 80 is fixedly closed without using a sealing wire as in FIG. 4A by hooking the hooking hole 84 to the hooking protrusion 88. Can do. Further, when the inner conductor surrounding portion 80 is opened, the hooked state of the hooking hole 84 and the hooking protrusion 88 may be released, and the inner conductor surrounding portion 80 can be easily opened. By selecting the latching hole 84 according to the thickness of the covered covered electric wire 50, the outer surface of the covered electric wire 50 can be brought into close contact with the inner surface of the inner conductor surrounding portion 80.

The above-described latching mechanism may be applied to the intermediate surrounding portion, and may be used in combination with both or one of the closing ring and the sealing line.
As described above, according to the present embodiment, the slit can be freely opened and closed without using a closing ring and a sealing line, so that it can be easily and reliably closed even in a place where sealing is not necessary, Moreover, it can be easily opened, and workability is improved. Moreover, by using together with at least one of the latching mechanism, the closing ring, and the sealing wire according to the present embodiment, the slit can be held in the closed state more reliably, and a short circuit accident and a ground fault can be prevented. And safety is improved.

  DESCRIPTION OF SYMBOLS 1 ... Terminal cover, 12 ... Intermediate surrounding part, 14 ... Inner conductor surrounding part, 16 ... Slit, 18 ... Front cover member, 18a ... End edge part, 20 ... Back cover member, 20a ... End edge part, 22 ... Closure ring , 24 ... Ring retaining recess, 26 ... Sealing wire, 28 ... Projection, 30 ... Caulking ball, 40 ... Connection terminal part, 42 ... Connection terminal, 44 ... Base end part, 46 ... Tip part, 48 ... For connection Hole: 50 ... covered electric wire, 52 ... inner conductor, 54 ... bolt, 56 ... nut, 60 ... exposed conductor part, 70 ... inner conductor surrounding part, 72 ... front cover member, 74 ... latching claw, 76 ... back cover member , 78 ... hooked part, 80 ... inner conductor surrounding part, 82 ... front cover member, 84 ... hook hole, 86 ... back cover member, 88 ... hooking projection, 100 ... current transformer, 102 ... power supply side connection Child 104 ... Load side connector 106 ... Instrument terminal 1 DESCRIPTION OF SYMBOLS 0 ... Power supply side electric wire, 112 ... Power supply side connection terminal part, 120 ... Load side electric wire, 122 ... Load side connection terminal part, 130 ... Lead wire, 140 ... Connection terminal part, 142 ... Connection terminal, 144 ... Base end part DESCRIPTION OF SYMBOLS 146 ... Tip part, 148 ... Connection hole, 150 ... Covered electric wire, 152 ... Internal conductor, 154 ... Bolt, 156 ... Nut, 160 ... Insulating tape

Claims (3)

A connecting terminal having a base end connected to each of the inner conductors protruding from the ends of the two covered electric wires and having a connecting hole at the tip, and a bolt inserted into the two connected connecting holes; And an insulating terminal cover that covers the inner conductor, and a connecting terminal portion between the covered wires provided with a nut that electrically and mechanically fixes the two connecting terminals by being screwed to the bolt,
An intermediate surrounding portion that surrounds the connection terminal portion, and an inner conductor surrounding portion that is connected to both end portions of the intermediate surrounding portion and covers the exposed inner conductors .
The intermediate surrounding portion and the inner conductor surrounding portion are configured by a two-fold cover member that sandwiches and covers the connection terminal portion and the inner conductor,
An insulated terminal cover, comprising: a closing ring that is hooked to the intermediate surrounding portion and that closely contacts end edges of the cover member as a hooking mechanism for closing the cover member so as to be freely opened and closed . Terminal cover according to claim 1, further comprising a seal line to maintain the latching state by the closed stop ring by attaching entangled in the closure ring. Claim 1 or 2 terminal cover according at least one of which being a current transformer connectors meter of said two covered wires.

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