JPH1070822A - Apparatus direct connection type cable terminal box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus direct connection type cable terminal box wherein an insulating tube is not rotated at the time of assembling and dismantling, dropping due to rotation can be perfectly prevented, and assembling is enabled without considering relative positional relation for anchoring a shield cylinder of a fixed pin. SOLUTION: A bellows 21 which is continuously connected with a fixed pin 11' and on which an insulating tube 22 is fixed is installed in a conductor leading-out rod 4, and anchoring between the fixed pin 11' and a trench in a shield cylinder 5 is operated by expansion and contraction of the bellows 21. It is preferable that a trench in the shield cylinder 5 anchoring the fixed pin 11' is made as a continuous ring shape in a circumference direction. It is also preferable that the bellows 21 is made a single body and connected between two fixed pins positioned in contrary directions. The bellows 21 may be connected independently with the respective fixed pins positioned in different directions, or interposed independently between the two fixed pins.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an equipment direct connection type cable termination box for a power cable.

[0002]

2. Description of the Related Art FIG. 6 shows an outline of an equipment direct connection type cable termination box in which a head of an insulator tube is sealed. As shown,
The device-directed cable termination box has a cable 3 inserted from below into a porcelain tube 2 attached to a device case wall 1, and a conductor lead rod 4 connected to the end of the cable 3 is provided at the head of the porcelain tube 2. The insulator tube 2 is supported by a metal shield tube 5.
An insulating gas is sealed between the device case wall 1 and the device case wall 1. The shield tube 5 is a sealing member for preventing the insulating gas from entering the porcelain tube 2 (dielectric breakdown may occur if the insulating gas enters the porcelain tube 2) and a conductor lead rod. 4 also serves as a connection fitting for connecting the terminal section of the device.

The above insulator tube 2 penetrates a hole 6 formed in the equipment case wall 1 and is attached to the equipment case wall 1 with a bolt 7. The shield tube 5 is formed of a metal bottomed cylinder (non-penetrating type), and is embedded in the head of the insulator tube 2 so as to hermetically close it. The lower part of the conductor pull-out bar 4 is formed in a sleeve shape, and the conductor end 8 exposed by stripping the cable 3 is compression-connected thereto.
The upper part of the conductor lead-out bar 4 is formed in a rod shape, and is engaged with a recess formed in the shield tube 5. As shown in FIG. 7, holes 9 are formed in the center of the conductor lead rod 4 horizontally in the radial direction at intervals of 180 degrees, and are urged in the holes 9 by springs 10 so as to protrude outward. Fixed pin 11 is accommodated. On the other hand, arcuate engagement grooves 12 are formed on the inner peripheral surface of the shield cylinder 5 along the circumferential direction at intervals of 180 degrees.

The fixing pins 11 are fitted and locked in these engagement grooves 12 as the cable 3 is inserted into the insulator tube 2. That is, when the conductor extraction rod 4 is inserted into the insulator 2 along with the cable 3, the fixing pin 11 protruding from the outer peripheral surface of the conductor extraction rod 4 slides on the tapered portion 13 on the inner peripheral surface of the insulator tube 2 to form a hole. The insulator tube 2 is rotated so that the fixing pin 11 is aligned with the engagement groove 12 (long-diameter portion) in this state. Then, the fixing pin 11 is fitted and locked in the engagement groove 12, and the conductor pull-out bar 4 is fixed to the shield tube 5 in a state where it cannot be removed. When the insulator tube 2 is rotated by 90 degrees from this state to move the fixing pin 11 to the outside (short diameter portion) of the engaging groove 12, the fixing pin 11 is pushed into the hole 9 of the conductor lead rod 4. Since the fixing pin 11 is released from the locked state with the engaging groove 12, the insulator tube can be removed.

[0005]

However, in the cable termination box directly connected to equipment as described above (FIGS. 6 and 7), it is necessary to rotate the insulator tube 2 around 90 degrees at the time of assembly or disassembly.
This is an effective means when the voltage is low and the insulator tube 2 is relatively weighed. However, when the insulator tube 2 is extremely high pressure, the operation of rotating the insulator tube 2 is very severe because the insulator tube 2 is large and heavy. In particular, when the cable termination box attaches the porcelain tube 2 to the device not vertically but horizontally, the operation becomes more severe.

In addition, in order for the cable and the insulator tube to be engaged, the arc-shaped groove of the shield cylinder must be aligned with the fixing pin, which is a very laborious operation.

Further, when the cable 3 is rotated by 90 degrees during operation of the power transmission line due to a rotational force due to some cause (such as twisting of the cable conductor), the fixing pin 11 is inserted into the hole 9 of the conductor lead rod 4. Into the disengaged state,
The shield tube 5 on the insulator tube 2 side and the conductor lead bar 4 on the cable 3 side
May be electrically and mechanically disconnected.

For this reason, there has been a demand for a device-directly-connected cable termination box which can reduce the work load at the time of assembling and disassembling and can prevent the cable from falling off due to the rotation of the cable.

Therefore, the problems to be solved by the present invention (objects)
Can completely prevent falling off due to rotation without rotating the insulator tube during assembly or disassembly, and also can assemble without considering the relative positional relationship for locking of the shield cylinder of the fixed pin Another object of the present invention is to provide a cable termination box directly connected to equipment.

[0010]

According to the present invention, there is provided a cable end box directly connected to equipment provided with a non-penetrating shield tube which is embedded so as to be tightly plugged at an end of a porcelain tube, and inserted into the shield tube. In combination with the conductor pull-out rod on the cable side, a fixing pin is provided on the outer portion of the conductor pull-out rod so as to be able to protrude and retract in the radial direction and toward the outside, and this fixing pin is engaged with the groove in the shield cylinder. In this structure, a bellows connected to a fixing pin and having an insulative tube is provided inside the conductor drawing rod, and the engagement between the fixing pin and the groove in the shield cylinder is controlled by expansion and contraction of the bellows. It is like that.

In the above structure, the bellows is
A fluid, such as a liquid or a gas, is charged, and when it is pressurized to some extent, it expands, and when the pressure decreases, it contracts. The fixing pin of the bellows (flange portion) inside the conductor pull-out rod is designed so that when the bellows is extended, the fixing pin protrudes from the outer peripheral surface of the conductor pull-out rod, and when the bellows contracts, the fixing pin pulls out the conductor. It is advisable to adjust the pin length so that it is pulled into the rod.

The groove in the shield cylinder for locking the fixing pin is preferably formed in a ring shape continuous in the circumferential direction.

The bellows may be formed as a single body and connected between two fixing pins having opposite directions.
Alternatively, the bellows may be independently connected to each of the fixing pins having different directions. Alternatively, the bellows may be independently interposed between the two fixing pins.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a cable terminal box directly connected to equipment according to the present invention, and FIGS. 2 and 3 show a main part of the terminal box; In the device-directed cable termination box of this embodiment, a cable 3 is inserted from below into a porcelain tube 2 attached to a device case wall 1,
The conductor extraction rod 4 ′ connected to the end of the cable 3 is connected to the insulator tube 2.
Supported by a metal shield tube 5 provided at the head of
An insulating gas is sealed between the insulator tube 2 and the device case wall 1. The shield tube 5 is a sealing member that prevents the insulating gas from entering the porcelain tube 2 (there is a possibility that the insulating gas enters the porcelain tube 2 to cause insulation breakdown). Conductor extraction rod 4 '
It also serves as a connection fitting for connecting the device and the terminal of the device.

The porcelain tube 2 passes through a hole 6 formed in the equipment case wall 1 and is attached to the equipment case wall 1 with a bolt 7. The shield tube 2 is formed of a metal bottomed tube (non-penetrating type), and is embedded in the head of the insulator tube 2 so as to hermetically plug it. The lower part of the conductor pull-out bar 4 'is formed in a sleeve shape, and the conductor end 8 exposed by stripping the cable 3 is compression-connected to the sleeve.
The upper part of the conductor extraction rod 4 'is formed in a rod shape,
It is designed to be engaged with a recess formed in the shield tube 5.

Now, in the cable termination box directly connected to the device having the above-described configuration, the conductor extraction rod portion is improved. That is, as shown in FIG. 2, the conductor extraction rod 4 'has two radial holes 9' formed at intervals of 180.degree., And has an internal chamber communicating with these holes 9 ', 9'. Fixing pins 11 ', 11' are slidably inserted into the two holes 9 ', 9', respectively, and the bellows 21 is housed in the inner chamber side. To the inner ends of the fixing pins 11 ', 11', while
At the fixed pin locking position in the shield cylinder 5, a ring-shaped groove 12 'continuous in the circumferential direction is formed, and the fixing pins 11' and 11 'are protruded from the conductor pull-out bar 4' to form the shield cylinder. 5 is locked in the groove 12 '. 22
Is an insulating tube having one end connected to the bellows 21 and the other end connected to a pressurizing source (not shown) of a fluid such as a liquid or a gas.

FIG. 2A shows that the bellows 21 is extended and expanded by pressurizing the fluid from the insulating tube 22, so that the two fixing pins 11 'and 11' are placed outside the conductor drawing rod 4 '. This shows a state in which the cable termination box is protruded, which is a state at the time of operation after assembling the cable termination box. On the other hand, FIG.
Shows a state in which the bellows 21 is contracted without pressurizing the fluid and the two fixing pins 11 ', 11' are retracted into the conductor extraction rod 4 '. This is the state when the cable termination box is assembled and disassembled.

The procedure for assembling and disassembling the equipment-directed cable termination box having the above structure will be described. First, at the time of assembly, pressure is not applied to the bellows 21 and the fixing pin 1
With the 1 'retracted into the conductor extraction rod 4', the conductor extraction rod 4 'is inserted into the insulator tube 2 together with the cable 3. The conductor extraction rod 4 ′ is inserted into the shield tube 5, and the fixing pin 1
When 1 'reaches the position of the ring-shaped groove 12', the inside of the bellows 21 is pressurized with a fluid from the insulating tube 22. Then, as shown in FIG. 3, the bellows 21 is extended, and the fixed pin 11 'connected to the bellows protrudes from the conductor extraction rod 4' and is fitted and locked in the ring-shaped groove 12 '. In this state, the end of the insulating tube is sealed as shown in FIG. As a result, the bellows 21 remains extended, and the state in which the fixing pin 11 ′ is locked in the ring-shaped groove 12 ′ is maintained, so that the structure for preventing the falling off is achieved.

On the other hand, at the time of disassembly, the sealing 23
Is released, the internal pressure of the bellows 21 is reduced, and the bellows 21 is contracted. Then, the fixing pin 11 ′ is retracted and accommodated in the conductor pull-out bar 4 ′, and the locked state of the fixing pin 11 ′ with the groove 12 ′ is released, so that the insulator tube 2 can be pulled out.

FIG. 4 shows another embodiment of a cable termination box directly connected to equipment according to the present invention, in which a partition is provided in an inner chamber of a conductor lead-out rod 4 ", and left and right divisions divided by the partition are provided. An independent bellows 21 "is provided in each of the chambers, and a fixing pin 11" is connected to each of the bellows 21 '.
This shows a state where 1 "is extended and the fixing pin 11" is protruding.

FIG. 5 shows still another embodiment of a cable termination box directly connected to equipment according to the present invention, in which a bellows 21 "" is interposed independently between opposed fixing pins 11 "". It is a thing. Reference numeral 24 denotes a spring for pressing the fixing pin 11 "" separated from the bellows 21 "" toward the bellows "" and stabilizing the posture of the fixing pin. In this figure, the bellows 21 "is contracted. The state is shown.

[0022]

According to the present invention as described above, it is possible to completely prevent the insulator tube from falling off due to rotation without rotating the porcelain tube during assembly or disassembly, and also to lock the shield cylinder of the fixing pin. It is possible to achieve an intended problem (object) of providing a device direct-connection type cable termination box which can be assembled without considering a relative positional relationship.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a device direct-connection type cable termination box according to the present invention in a substantially half section.

2A is a longitudinal sectional view showing a main part of the equipment direct connection type cable termination box shown in FIG. 1; a fixing pin is protruded at a conductor extraction rod portion, and FIG. 2B is a fixing pin of the conductor extraction rod. FIG. 3 is a longitudinal sectional view showing the state in which is retracted.

FIG. 3 is a main part of a cable termination box directly connected to equipment shown in FIG. 1;
FIG. 5 is a cross-sectional view showing a state in which a fixing pin is projected and locked in a conductor extraction rod portion and a shield cylinder.

FIG. 4 is a longitudinal sectional view showing another embodiment of the device direct connection type cable termination box according to the present invention, showing only the main part;

FIG. 5 is a longitudinal sectional view showing still another embodiment of a device direct-connection type cable termination box according to the present invention, showing only a main part;

FIG. 6 is a front view showing an example of a conventional device direct connection type cable termination box in a substantially half section.

7 is a main part of the equipment direct-connection type cable termination box shown in FIG. 6;
FIG. 6 is a cross-sectional view showing a state in which a fixing pin protrudes and is locked at the conductor extraction rod portion and the shield cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device case wall 2 Insulator tube 3 Cable 4 ', 4 ", 4"' Conductor lead-out bar 5 Shield cylinder 6 Machine case wall hole 7 Bolt 8 Cable conductor end 11 ', 11 ", 11"' Fixed pin 12 'Groove (Ring shape) 21, 21 ", 21" "Bellows 22 tube

Claims (5)

[Claims] 1. A combination of a non-penetrating shield tube embedded so as to be tightly plugged at the end of an insulator tube and a conductor lead bar on a cable side inserted into the shield tube. In a device direct-connection type cable termination box having a structure in which a fixing pin is provided on the outer portion so as to be able to protrude and retract in the radial direction and toward the outside, and the fixing pin is locked in a groove in the shield cylinder to prevent the detachment. A device direct-connection type cable termination, in which a bellows connected to a fixing pin and having an insulating tube attached is provided inside the conductor drawing rod, and the locking of the fixing pin and the groove in the shield cylinder is operated by expansion and contraction of the bellows. box. 2. The cable termination box according to claim 1, wherein the groove in the shield cylinder for locking the fixing pin has a ring shape continuous in a circumferential direction. 3. The cable termination box according to claim 1, wherein said bellows is formed as a single body and connected between two fixing pins having opposite directions. 4. The cable termination box according to claim 1, wherein said bellows is independently connected to each of fixing pins having different directions. 5. A cable termination box according to claim 1, wherein said bellows is independently interposed between two fixing pins.