JPH08106956A - Connector with built-in lead-in fuse - Google Patents

Abstract

PURPOSE: To provide a connector with built-in lead-in fuses by which connection of lead-in wire protective fuses and connection of neutral conductors can be attained simultaneously with plug-in. CONSTITUTION: A necessary number of low voltage lead-in wire protective fuses 2 and short-circuit bars 3 are separately enclosed in a protective cylinder 1 through insulators 7 having respective phases according to a low voltage lead-in system, and both ends are blocked up by caps 4. A plug 5 is arranged from one cap 4 and a socket 6 is arranged from the other cap 4 in a projecting shape, and are respectively connected to the fuses 2 and the short-circuit bars 2. In this case, in the plug 5 and the socket 6, the central axis is arranged in astigmatic symmetry, and a plug and a socket to be connected to the short- circuit bars are made longer than a plug and a socket having the other phase.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-in fuse built-in connector used when a lead-in wire is connected by a plug-in method as a lead-in method in a low-voltage distribution line.

[0002]

2. Description of the Related Art Conventionally, when connecting a lead wire in a low voltage distribution line, a low voltage fuse for protecting the lead wire is 1
Each phase was connected to the drop wire by means of compression connection, screw connection or the like. Therefore, it took a long time to work, and it was necessary to pay sufficient attention not to make a mistake in the connecting phase. In addition, when replacing the compression-connected fuse, the electric wire at the connecting portion must be cut, and the length of the connecting electric wire must be increased in advance.

[0003]

Plug-in connection is conceivable as one method for connecting service lines. That is, this is a system in which a drop line connector is provided in the middle of the low voltage trunk line and the drop line is connected to this connector. Connection of lead-in wire is extremely easy and workability is improved, but how to handle connection of fuse for lead-in wire protection and connection of neutral wire, and how to prevent incorrect connection between phases are problems. Becomes

Therefore, an object of the present invention is to provide a connector with a built-in fuse for a lead-in, which can achieve connection of a fuse for lead-in wire protection and connection of a neutral wire at the same time as a plug-in in such a lead-in wire connection system of a plug-in system. It is in the place of providing.

Another object of the present invention is to provide a connector with a built-in fuse for pulling in, which can prevent erroneous connection between phases.

[0006]

In order to achieve the above object, in the present invention, a connection for connecting a low voltage main line by incorporating a lead wire protection fuse and a short-circuit bar in a protective cylinder and providing plugs and sockets at both ends. This is a connector that can be connected to the device and service line by a plug-in method.

That is, in the connector with built-in lead-in fuse of the present invention, the required number of low-voltage lead-in wire protection fuses and short-circuit bars corresponding to the low-voltage lead-in system are separated by the phase insulators provided at both ends of the protective tube. It is built into the protective cylinder, both ends are closed with caps, and the required number of plugs from one cap and the required number of sockets from the other cap are arranged with their central axes arranged in a point-symmetrical manner. Plugs and sockets that are installed in the shape of and are connected to the short-circuit bar,
It is a connector with a built-in fuse for retracting, which is longer than the plug and socket of the other phase and is connected to the fuse and the short-circuit bar, respectively. More specifically, the required number of low-voltage lead-in wire protection fuses and short-circuit bars are built into the protective cylinder according to the low-voltage pull-in method. A conductive sleeve is provided by penetrating each of the phase insulators that are provided, and connecting terminals on both sides are compression-connected to the inner end of the fuse to build a low-voltage lead-in wire protection fuse inside the protective cylinder. Shorting bar with an insertion hole that can connect the socket,
The plugs are attached to the outer ends of the conductive sleeve and the short-circuit bar, and the sockets are attached to the other end of the conductive sleeve and the short-circuit bar to project from the cap. It is a connector with a built-in fuse for drawing in.

Further, a required number of low-voltage lead-in wire protection fuses and short-circuit bars are built into the protective cylinder according to the low-voltage lead-in system,
In a connector with a built-in fuse for which the both ends are closed with caps, the fuse body is built in the protective cylinder by penetrating each phase insulator provided at both ends of the protective cylinder at the fuse terminals and lead bars provided at both ends, Further, a short-circuit bar having insertion holes capable of connecting plugs or sockets at both ends is built in the protective cylinder by penetrating each phase insulator at the both ends, and one of the fuse terminal, the lead bar and the short-circuit bar is This is a connector with a built-in fuse for pulling in which a plug is attached to the outer end portion and a socket is attached to the other outer end portion so as to project from the cap.

In the low-voltage pull-in method, two fuses and one short-circuit bar are used when a single-phase three-wire system is adopted, and two fuses and two short-circuit bars or three fuses and a short-circuit bar are used in a three-phase four-wire system. One will be built in.

It is desirable that the arrangement state of the plugs and sockets is not point-symmetrical, and that the plugs and sockets connected to the shorting bar connecting the neutral wire are longer than the other plugs and sockets.

[0011]

[Function] In this way, the fuse and short-circuit bar are built in,
If you connect the connectors with plugs and sockets on both ends to the connector that is connected to the low-voltage trunk line, connect the plugs or sockets to the drop wires to connect the drop wires, connect the fuses for protecting the drop wires, and connect the neutral wires. Connection becomes extremely easy, work time can be greatly shortened, and robot construction methods can be supported.

When the plugs and sockets are arranged in a point-symmetrical manner, the connection can be made directional, and the connection phase will not be mistaken. In addition, if the neutral wire plug or socket is made longer than that of other phases, the neutral wire will be connected first and disconnected at the end. Can also be prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments will be described below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of the plug-in pull-in system.
The drawing shows a state in which the drop wire D is plugged in using the low voltage drop connector C according to the present invention to the drop wire connector B to which is connected.

2 to 5 show an embodiment of a connector C with a built-in fuse for a lead-in, in which a fuse 2 for protecting a low-voltage lead-in wire and a short-circuit bar 3 are built in a protective cylinder 1, and both ends are closed by a cap 4. ing. A plug 5 and a socket 6 projecting outward from the cap 4 are connected to both ends of the fuse 2 and the short-circuit bar 3. Reference numeral 7 is a phase insulator provided at both ends of the protective cylinder 1 for maintaining insulation between the phases. The central axes of the plug 5 and the socket 6 are arranged so as to be asymmetric with respect to each other, and the connected state is directional.

Further, the plug 5 and the socket 6 connected to the short-circuit bar 3 connecting the neutral wire are made longer than the plugs 5 and sockets 6 of the other phases connecting the external wires. Reference numeral 8 is a cylindrical plug guide provided outside the cap, and 9 is a socket guide. It is desirable to provide a locking mechanism so as to prevent the connection with the connector and the drop wire from being easily disengaged due to vibration, wind, or the like. For example, the outer circumference or the inner circumference of the plug guide 8, the socket guide 9, or the cap 4 This is achieved by providing a thread groove on the outer periphery of the connector and providing a movable ring with a thread groove on the plug or socket side of the connector and the drop wire, the movable ring having a thread groove engageable with the thread groove.

The low-voltage lead-in wire protection fuse 2 and the short-circuit bar 3 may be built in as many as the number corresponding to the lead-in system. For example, when the single-phase three-wire system is drawn in, two fuses, one short-circuit bar, and three-phase four
In the case of wire drawing, 2 fuses and 2 shorting bars or 3 fuses and 1 shorting bar are built in. During three-phase, four-wire system pull-in, if two fuses of the common phase are blown or cut off at the same time, or if there is an unbalanced load in the equipment used by the customer, an abnormal voltage may occur. It is desirable to prevent this by providing an abnormal voltage protection device on the customer side.

As the fuse element of the low-voltage lead-in wire protection fuse 2 used, various materials such as copper, copper alloy, copper plated with silver or tin, silver, tin, tin alloy, etc. are appropriately combined as in the conventional case. Use one. If an overcurrent flows through the element, it will melt or cut off.
The amount of metal gas generated at this time tends to increase as the overcurrent increases. Generally, as the fuse 2 for protecting the low voltage lead-in wire, there are a sealed electric wire fuse and a current limiting fuse for enclosing the metal gas in the fuse cylinder, and an open type electric wire fuse for releasing the metal gas. There is. The fuse incorporated in the connector of the present invention may be any of the above fuses.

In this example, a sealed wire fuse is used, and the connecting terminals 11 are attached to both ends of the fuse element 10 by tightening or soldering, and the outer circumference of the element 10 is extinguished by an arc such as a glass tube. It is covered with a cylinder 12.

An arc extinguishing ring 13 made of silicone resin rubber is attached near the center of the inner surface of the arc extinguishing cylinder 12. Further, tube stoppers 14 made of an elastic insulator such as silicone resin rubber or foamed silicon are attached to both ends of the arc extinguishing tube 12, and are housed inside the fuse tube 15 so as not to move easily. The arc extinguishing ring 13 may be omitted when the breaking current is relatively small.

A rotation stopper 17 made of a resin such as polycarbonate or unsaturated polyester is formed on the outer periphery of one end of the sleeve 16 and has an insertion hole for compression connection of the connection terminal 11 and an outside wire for the outside wire. Insertion holes for screwing, soldering, or compression-connecting the plug 5 and the socket 6 are provided. The whirl-stop 17 is directly welded and fixed to the fuse barrel 15 made of a resin such as transparent polycarbonate by ultrasonic welding, or the fuse cap 18 is provided with a non-rotating fitting portion, and the whirl-stop 17 is provided therewith. And the fuse cap 18 and the fuse cylinder 15 are fixed and sealed by ultrasonic welding.

6 and 7 show an example in which the current limiting fuse 19 is used. The current limiting fuse forms an insulating compound by reacting the metal gas generated when the fuse element is blown or cut off with the silica sand filling the outer circumference of the element, and the fuse is operated in parallel with the fuse element. This display line is melted by flowing a total current through a thin display line of high resistance stretched in a state where a spring force is constantly applied to the display line that displays, and is connected to the display line by the spring force. The display unit is projected to display an operation at the time of melting or interruption.

A fuse terminal 20 and a lead bar 21 are connected to both ends of the fuse body, and the external wire plug 5 and the external wire socket 6 are screwed, soldered or compression-connected to the respective tips. An insertion hole is provided.

In any of the above examples, the short-circuit bar 3 for neutral wire can have the same structure. That is, at the tip of a rod-shaped or plate-shaped short-circuit bar 3 formed of copper or a copper alloy or tin-plated copper or copper alloy, a plug 5 and a socket 6 having a protrusion length from the cap 4 longer than that of the plug 5 and the socket 6 of another phase are provided. Insertion holes are provided for screwing, soldering or compression connection.

Further, the protective cylinder 1 and the cap 4 in the above embodiment are made of resin such as polycarbonate and are provided with a screw portion at a portion to be a fitting portion and screwed, or sealed with an adhesive, or It shall be fixed by ultrasonic welding. In order to ensure the watertightness, the edge 4a of the cap 4 and the protective cylinder 1 may be sealed with a silicone adhesive. Each phase insulator 7 is fitted to both ends of the protective cylinder 1 by using an unsaturated polyester resin or a polycarbonate resin.
Alternatively, it may be formed integrally with the cap 4.

The plug guide 8 and the socket guide 9 may be fixed to the cap 4 by adhesion or ultrasonic welding, or may be formed integrally with the cap 4. One or a plurality of O-rings 23 for ensuring watertightness are attached to the socket guide 9 by bonding or fitting.

Since the connector with a built-in lead-in fuse of the present invention has one plug and the other socket, if the lead-in wire can be protected by the high-voltage fuse attached to the high-voltage side when connecting the lead-in wire, the lead-in plug is plugged. Alternatively, the socket can be directly connected to the socket or plug of the connector to eliminate the use of the connector.

[0027]

As described above, the connector with a built-in fuse of the present invention has a built-in fuse and a short-circuit bar according to the drawing system, and is connected to a connector connected to the low voltage main line and a lead wire connected to a plug or a socket. By using it, it is extremely easy to connect the lead wire, connect the fuse for protecting the lead wire, and connect the neutral wire, and it is possible to significantly reduce the working time and realize the lead-in method that is compatible with the robot construction method. I will get it.

Further, in the structure in which the central axes of the plug and the socket are arranged non-point symmetrically and the plug and the socket connected to the short-circuit bar are longer than the plugs and the sockets of other phases, erroneous connection is prevented. At the same time, it is possible to prevent abnormal voltage from being applied to the equipment when the phase of the neutral line is lost, which is excellent in safety.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a plug-in pull-in method using a pull-in fuse built-in connector according to the present invention,

FIG. 2 is a front view showing an embodiment of a retractable fuse built-in connector according to the present invention;

FIG. 3 is a left side view of the connector,

FIG. 4 is a right side view of the connector,

5 is a sectional view taken along line XX in FIG.

FIG. 6 is a front view of a connector with a built-in fuse for retracting, showing an example using a current limiting fuse;

FIG. 7 is a sectional view similar to FIG. 5 in the same example.

[Explanation of symbols]

 C ... Connector with built-in fuse for lead-in 1 ... Protective cylinder 2 ... Fuse for protecting low voltage lead-in wire 3 ... Short-circuit bar 4 ... Cap 5 ... Plug 6 ... Socket 7 ... Insulator for each phase

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuya Oda 3-2-6 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture Osaka Fuse Co., Ltd. (72) Juichi Yoshikawa 3-2 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture No. 6 in Osaka Hughes Co., Ltd.

Claims (4)

[Claims] 1. A required number of low-voltage lead-in wire protection fuses and short-circuit bars according to the low-voltage pull-in method are separated by phase insulators provided at both ends of the protective cylinder and built in the protective cylinder, and both ends are capped. In addition, the required number of plugs from one cap and the required number of sockets from the other cap are arranged in a projecting shape with their central axes arranged in a point-symmetric manner, and are connected to the short-circuit bar. Plug and socket
A connector with a built-in fuse for retraction that is longer than the plug and socket of the other phase and is connected to the fuse and short-circuit bar respectively. 2. In a connector with a built-in lead-in fuse in which a required number of low-voltage lead-in wire protection fuses and short-circuit bars are built into the protective barrel according to the low-voltage lead-in system, and both ends are closed with caps, provided at both ends of the protective barrel. A conductive sleeve is pierced through each phase insulator, the connecting terminals on both sides are compression-connected to the inner end of the fuse, and a fuse for low-voltage service wire protection is built into the protective cylinder, and plugs or sockets are provided at both ends. A short-circuit bar having an insertion hole capable of connecting to each other is built into the protective cylinder by penetrating each phase insulator at the both ends, and a plug is provided at one outer end of the conductive sleeve and the short-circuit bar and the other is provided. A connector with a built-in fuse for retracting, which has a socket attached to the outer end and is provided so as to project from the cap. 3. A connector with a built-in lead-in fuse in which a required number of low-voltage lead-in wire protection fuses and short-circuit bars are built into a protective cylinder according to the low-voltage lead-in system, and both ends are closed by caps, with fuse bodies provided at both ends. The fuse terminals and lead bars penetrate through the phase insulators provided at both ends of the protective cylinder and are built in the protective cylinder, and short-circuit bars having insertion holes at both ends to which plugs or sockets can be connected, Built in the protective cylinder by penetrating each phase insulator at the both ends, and attaching a plug to one outer end of the fuse terminal, the lead bar and the shorting bar, and a socket to the other outer end of the fuse terminal, the cap. A connector with a built-in fuse for pulling in that is provided in a protruding shape from. 4. The connector with a built-in fuse for pull-in according to claim 1, 2 or 3, further comprising a cylindrical plug guide and socket guide surrounding the plug and socket on the outside of the cap.