JPH0119556Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plug-in connection, and particularly to a plug-in connection suitable for configuring the termination of a high voltage cable.

FIG. 1 shows a plug-in connection applied to the termination of a conventional cross-linked polyethylene insulated power cable (hereinafter referred to as CV cable). In the figure, 1
1 is a bushing made of epoxy resin, 2 is a conductor pull-out rod for connecting to the conductor of the other equipment, 3 is a finger divided into a plurality of pieces with one end fixed to the tip of the conductor pull-out rod 2, 4 is a finger 3 is a so-called garter spring that contracts and deforms in the diametrical direction; 5 is a shielding cylinder; 6 is a cable insulator; 7 is a cable conductor connecting rod; 8 is a stress cone made of synthetic rubber;
9 is a stress cone compression cylinder, 10 is a compression spring, and 8a is a stopper for the stress cone 8.

In a plug-in connection part with such a structure, when the cable is pulled downward by a strong impact force, the finger 3 and the conductor connecting rod 7 will separate, and if the above happens during power transmission, the finger part A considerable arc is generated, and the damage is greater than expected.

To eliminate this risk, conventionally the cable is fixed to the structure outside the connection part (lower in the figure) with a cleat or bracket, but if the cable sheath is made of vinyl, the cleat or bracket should be strongly tightened. In this case, the vinyl exhibits a creep phenomenon and a sufficient effect cannot be expected. Therefore, although the advantages of plug-in connections, such as ease of assembly, are recognized, they are currently hardly used as permanent connections for the reasons mentioned above.

The purpose of this invention was to eliminate the above-mentioned drawbacks; when the connection part is assembled, the radially expandable receptacle and the conductor connecting rod are interlocked to completely prevent the cable from being pulled out. To provide a plug-in connection part which has a mechanism to prevent such problems and to easily detach a conductor connecting rod from a receptacle by releasing the interlock by pulling out a stress cone to some extent when the connection part is disassembled.
An embodiment of the present invention shown in FIG. 2 will be described below. In FIG. 2, parts common to those in FIG. 1 are given the same reference numerals. In the figure, inside the shielding cylindrical body 5, a conductor connecting rod 7 having a head 7a at one end is inserted into a receptacle 11 having a protrusion 11a on the inner periphery, and the head 7a and the protrusion 11a are locked. .

The receptacle 11 includes one in which the finger socket 3 is held down by a garter spring 4 so as to be able to expand and contract in the radial direction, as well as one in which a slit is provided at one end of the cylindrical socket so that the receptacle can be opened and expanded in the radial direction.

A lock cylindrical body 12 is fitted into the cylindrical body 5. One end of the lock cylinder 12 is fitted between the outer periphery of one end of the receptacle 11 and the inner periphery of the cylinder 5, and the other end is adapted to abut against the stopper 8a of the stress cone. A stepped portion 1 is provided on the inside of the lock cylinder 12.
2a, and a coiled compression spring 13 is disposed between the stepped portion 12a and the receptacle 11. Compression spring 13 urges lock barrel 12 away from receptacle 11.

14 is for preventing the lock cylinder 12 from falling off.
This is a cylindrical drop-off prevention member fixed to one end of the cylindrical body 5 by press-fitting, screwing, or other appropriate means.

The outer diameter of the lock cylindrical body 12 is large enough to allow it to be inserted into the cylindrical body 5 and the falling-off prevention member 14 freely, and the inner diameter of one end is such that it can be inserted into the cylindrical body 5 and the fall prevention member 14 freely. , is sized so that it can be loosely inserted into the outer periphery of the receptacle 11. Furthermore, when assembled as shown in FIG _.
When the stress cone 8 and stopper 8a are moved downward, the lower end portion 12b fitted into the fall prevention member 14 has a dimension l ₂
Assume that it can move by (>l ₁ ).

Next, a method for assembling and disassembling the plug-in connection section having the structure of the present invention will be explained. The assembly method is to move the stress cone 8 a little further down in the figure along the cable sheath than its normal position.
Insert the conductor connecting rod 7 into the receptacle 11.
At this time, the lock cylinder 12 is pushed downward by the compression spring 13, and the locked state is released under the condition l ₂ > l ₁ , so the head 7a of the conductor connecting rod 7 pushes the receptacle 11. It is expanded and inserted into the receptacle. Next, when the stress cone 8 is moved to the normal position, the stopper 8a pushes up the lower end 12b of the lock cylinder 12 and is fitted onto the outer periphery of the receptacle 11, so that the head 7a and the protrusion 11a are inserted.
The interlock is completed.

To disassemble it, if you pull down the stress cone 8 by more than _l2 , the compression spring 13 will push down the lock cylinder 12 and release the interlock, so you can pull out the cable by applying some force. However, the above condition is that the cable does not move downward when the stress cone is pulled down, and if the cable moves downward, the head 7 of the conductor connecting rod 7
a forces the receptacle 11 apart in the diametrical direction, so that the locking barrel 12 cannot move downward. In this case, if a force is applied to push the conductor connecting rod 7 into the receptacle again, the expanded receptacle will contract in the diametrical direction by the garter spring 4, and at the same time, the compression spring 13 will operate and the lock cylinder 12 will be closed. By pushing downward, the conductor connecting rod 7 can be pulled out from the receptacle 11.

Although the above embodiments have been described with respect to cable termination connections, the present invention is not limited thereto, and can also be applied to air terminations and various connection boxes (straight connections, branch connections, etc.).

As described above, according to the present invention, since the lock cylinder that is inserted between the cylinder and the receptacle is detachably arranged, the receptacle and the conductor connecting rod can be firmly connected in the assembled state. Furthermore, during disassembly, the conductor connecting rod can be easily removed from the receptacle by moving the lock cylinder using a compression spring.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a conventional plug-in connection part, and FIG. 2 is a longitudinal sectional view showing an embodiment of the plug-in connection part according to the present invention. 5... Cylindrical body, 7... Conductor connecting rod, 8... Stress cone, 8a... Stopper, 11... Receptacle, 12... Lock cylinder, 13... Compression spring.

Claims (1)

[Scope of utility model registration request] In a plug-in connection part in which a conductor connecting rod having a head at one end is inserted into a radially expandable receptacle having a protrusion on the inner periphery within a cylindrical body, and the head and the protrusion are engaged. A lock cylinder whose one end is fitted between the receptacle and the cylinder is disposed inside the cylinder, and a compression spring is disposed to press the lock cylinder away from the receptacle. A plug-in connection part characterized in that a stopper is provided for holding one end of a lock cylinder between a receptacle and a cylinder against a spring force.