JP3449263B2 - Steady device for equipment directly connected terminal and branch terminal - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to relates to the technical field of power cables for equipment direct-type sealing end, in particular, made the connection between the device side conductor and the cable-side conductor at the tightening of one bolt structure The present invention provides a steady rest structure as a mechanical reinforcement technology for the equipment direct connection terminal and the branch terminal.

[0002]

2. Description of the Related Art FIG. 7 shows an example of the structure of a power cable device direct connection type terminal connecting portion in which a device side conductor and a cable side conductor are connected by a single bolt. This is a method of terminating the device direct connection terminal 2 with respect to the bushing.

However, the electric equipment bushing 1 is composed of a conductor 1b having a female screw and an insulator 1a so as to protrude from the equipment case 5a, and one equipment direct connection terminal 2 is
The terminal 2b is embedded in the body 2a which is substantially T-shaped with an insulating material, and the terminal 2 is provided in the cylindrical portion formed in the T-shaped head.
I am trying to face b.

The electric equipment bushing 1 is inserted into the hole of the T-shaped head of the equipment directly connected terminal 2, and the bushing side screw 3a of the tightening bolt 3 is penetrated from the rear portion of the cylindrical portion to the terminal 2b. The conductor 1b and the terminal 2b are tightened and fixed by screwing into the female screw and engaging the tool with the hexagonal portion 3b of the tightening bolt to further tighten.

Reference numeral 4 denotes an insulating plug, which is fitted in the rear side of the cylindrical portion of the device direct connection terminal 2 and the female screw 4a of the tightening bolt is screwed into the female screw 4a to maintain a good insulating state. I have to. A conductive layer is formed on the surface of the main body 2a so that the surface is grounded.

2d is a power cable, the terminal of which is connected to the terminal 2b of the device directly connected terminal by an appropriate connecting means,
The connecting portion is processed by the waterproof tape winding 2c.

In the terminal directly connected to the equipment having such a structure, the equipment-side conductor and the cable-side conductor are connected to the terminal by one bolt. Therefore, the terminal 2b can be easily moved by moving the power cable 2c left and right. Swing to the right, tightening bolt 3
Loosens.

Therefore, as shown in FIG. 8, the power cable portion directly below the terminal 2 directly connected to the equipment is connected to the cable support 6
By fixing the electric power cable to the electric device 5 side, the movement of the electric power cable is suppressed, and further, the loosening of the tightening bolt 3, which is a key to the tightening connection, is prevented.

[0009]

The above-mentioned conventional technique; the steady rest technique by the device direct connection terminal and the cable support shown in FIGS. 7 and 8 may cause the following problems. That is, depending on the structure of the electric device, it is difficult to fix the power cable directly below the terminal 2 directly connected to the device, and as shown in FIG. 9, the cable is formed by the bottom plate at the ground level of the outer case 8 of the electric device 7. It may be necessary to fix it with the support 9, and sometimes the cable support cannot be used.

In the above case, as is apparent from FIG. 9, the distance from the device direct connection terminal 2 to the cable support 9 becomes large, so that a large current such as a three-phase short-circuit current is generated in the power cable between them. Flow, a large electromagnetic force is generated in the direction indicated by the symbol F, and the device directly connected terminal 2
Since a rotational force will be applied to, the tightening bolt for connection will loosen.

Further, when the equipment direct connection terminals are connected using an adapter and the power cable is branched and connected as shown in FIG. 10, when a three-phase short-circuit current flows through the branch cable, the branch cable and the branch terminal 14 are coded. There is a problem in that a rotational force and a repulsive force as shown by F are generated, and the conductor portion connecting the branch terminal 14 and the main circuit terminal 2 is bent. In particular,
When the branch cable is a small size cable with greater flexibility, the branch cable itself tends to rotate,
The tightening bolts are more likely to loosen.

Therefore, the problems (objectives) to be solved by the present invention
The first object is to provide a steady rest structure for a device directly connected terminal in which the terminal does not rotate even if the cable is not fixed directly under the device directly connected terminal. Another object of the present invention is to provide a steady rest structure of this type that can be easily retrofitted after installation and installation of a device direct connection terminal.

Further, as a second object, in the case of connecting the branch cable, the three-phase branch cable terminal portion is fixed, and the bending of the conductor portion connecting the branch terminal and the main circuit terminal by the short circuit electromagnetic force is bent. An object of the present invention is to provide a steady rest structure for a device direct connection terminal and a branch terminal, which does not generate a vibration.

[0014]

The first means provided to achieve the first object of the present invention is to connect and fix the three connecting body parts to each other. A spacer having rubber elasticity is attached to and the outer periphery of the spacer is fastened and fixed with a flexible band.The spacer has a substantially concave shape and has a hole shape in the middle and groove shapes on both sides. The shape of the hole in the middle has an inner diameter that is almost the same as the outer diameter of the connecting part body attached to it, and a notch is formed at one place on the circumference, and the groove shape on both sides is the outside of the connecting part body. The steady rest structure for a device directly connected terminal has a curvature that matches the diameter and is configured to come into contact with the range of 120 to 180 ° inside the connection portion main body on both sides.

As described above, the shape of the hole in the middle of the spacer and the shape of the grooves on both sides are fitted to the main body of the connecting portion, and the spacer is bound with a band having rubber elasticity to form three pieces. Since the pressure is not concentrated on the contact portion of the connection portion between the terminals of the device directly connected terminal, the deformation can be prevented.

Further, since the spacer has a notch in the hole shape of the spacer through which the device directly connected terminal is inserted, the spacer can be attached to the device directly connected terminal mounted on the electric device bushing.

Since the spacer has a trough-shaped groove corresponding to the width of the band in the concave bottom piece portion, the band can be securely fastened to the spacer.

The second means provided in order to achieve the second object of the present invention is to connect three sets of main bodies of connecting parts for main circuit and branch circuit. By connecting and fixing to the one that consists of three parts, the steady-state plate that has a hole 1 to 3 mm larger than the outer diameter of the cylindrical part can be detachably attached to the rear cylindrical part of the three connection main parts far from the equipment side. Mounting, this steady plate has three holes, which are opened at intervals determined by the equipment, and for one circuit (three phases)
Consists of a device-directly connected terminal and a branch terminal steady rest structure.

By attaching the steady rest as described above, the lateral repulsion of the branch terminal can be suppressed.

Further, by making the diameter of the three holes larger than that of the rear cylindrical portion of the branch end, the deviation of the mounting pitch of the three branch ends is allowed and the deformation force is applied to the cylindrical portion made of the insulating cylinder. Never add. (If the hole has no backlash, the insulating cylinder may be deformed improperly and the insulation characteristics may be deteriorated.) The edge of the steady rest that faces the main body of the connecting portion is chamfered to be c5 mm or more. As a result, the steady rest can be deeply inserted into the rear cylindrical portion of the branch end, and the steady rest effect of the steady rest can be enhanced.

As a third means to which both the first means and the second means are applied, the connection main body is connected to and fixed to two sets of three main bodies of the connecting portion for the main circuit and the branch circuit. In this way, a steady plate having a hole 1 to 3 mm larger than the outer diameter of the cylindrical portion is detachably attached to the rear cylindrical portions of the three connection main bodies far from the device side.
In any of the three connecting section main bodies of the set, a spacer having rubber elasticity is attached, and a connecting spacer made of an elastic body is attached between the spacers, and the two connecting sections are entirely flexible. It is possible to provide a steady rest structure for a device direct connection terminal and a branch terminal, which is constituted by tightening and fixing.

As a fourth means which is a modification of the above-mentioned second means, a system is adopted in which three connecting body bodies are connected and fixed to one formed by connecting two sets of a main circuit portion and a branch circuit portion. In the rear cylindrical portion of the three connecting portion main bodies remote from the side, a steady rest having a hole 1 to 3 mm larger than the outer diameter of the cylindrical portion is detachably attached, and the steady rest has the shape of the hole. 3 pieces are opened at intervals determined by the device,
One circuit (three phases) is fixed at once,
Furthermore, it is possible to provide a steady rest structure for a device direct connection terminal or a branch terminal, in which the steady rest plate is detachably fixed to a device main body or a device storage box portion.

By attaching such a steady rest, in addition to achieving the same effect as the second means,
By fixing the steady rest to the device body or the part of the device storage box, the steady rest can be prevented from swinging, and the steady rest effect of the terminal body can be further enhanced. Further, this means is effective when the mounting pitch of the terminals is small. That is, since it is not necessary to attach the spacer to the branch terminal as well as the device direct connection terminal, the attachment work of the steady rest structure becomes easy.

Also on the steady rest, it is preferable that the edge facing the main body of the connecting portion be chamfered to have a c5 mm or more.

As a fifth means, which is a modification of the third means, a system is adopted in which three connecting body bodies are connected and fixed to a body formed by connecting two sets of main circuits and branch circuits. At the rear cylindrical part of the three connecting part bodies far from the side, a steady plate having a hole 1 to 3 mm larger than the outer diameter of the cylindrical part is detachably attached, and the steady plate is attached to the device body or the device storage box. It is detachably fixed to the part, and further, spacers having rubber elasticity are attached to the three connection body parts far from the device side, and the outer periphery thereof is tightened and fixed with a flexible band, It is possible to provide a steady rest structure for a device direct connection terminal and a branch terminal.

This means is also effective when the mounting pitch of the terminals is small. That is, it is not necessary to attach the spacer to the connecting portion main body that is close to the device side and difficult to work, and the spacer may be attached only to the connecting portion main body that is far from the device side and easy to work.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment in which the first means of the present invention is embodied. (A) shows a situation in which a steady rest structure is attached to a device directly connected terminal and constructed. (B) specifically shows a steady rest spacer in the same steady rest structure.

The steady rest structure of the first embodiment uses a steady rest spacer 10 having rubber elasticity capable of flexibly coping with tightening, which is attached to the equipment main body 2 and the tightening band 11 is attached from the outside. It is constructed by tightening and fixing with.

The steady rest spacer 10 has a substantially concave shape, and has a hole shape 10a in the middle and groove shapes 10b on both sides, and the hole shape 10a in the middle is a notch 10.
A part is opened at c, so that the device directly connected terminal body 2
It can be mounted from the side.

The center hole shape 10a is curved with a curvature substantially equal to the outer diameter of the body of the equipment directly connected terminal body 2, and the groove shapes 10b on both sides are machined directly to the equipment directly connected terminal body 2.
The curved surface is processed to have a curvature that is almost equal to the outer diameter of the body. Also, the virtual center of the hole shape 10a in the middle and the groove shapes 1 on both sides
The distance from the virtual center of 0b is made to coincide with the mounting pitch of the device directly connected terminal main body 2. Further, the groove shapes 10b on both sides are at an angle of 120 to 180 ° in order to securely hold the device directly connected terminal main body 2 without locally deforming it when the device directly connected terminal main body 2 is bound from the side surface. It is molded.

The steady rest 10 has a trough-shaped groove 10d formed in its concave bottom piece so that the tightening band 11 can be positioned and set.

The steady rest spacer 1 constructed as described above
0 is mounted as shown in FIG. That is, from the notch 10c which is an opening of the hole shape 10a in the middle, the three of the device main bodies 2, 2, 2 in the middle are taken in from its side surface, and the groove shapes 10b on both sides are directly connected to the device on both sides. The terminal main bodies 2 and 2 are arranged, and the tightening band 11 is wrapped around from the outside thereof, and the band tightening metal fitting 11a
By tightening the whole by, the three device directly connected terminal bodies are bound together.

By providing the steady rest structure as described above, in the case where the electric power cable portion directly below the terminal body 2 directly connected to the equipment cannot be fixed and the electric equipment 7 is fixed by the cable support 9 at the bottom of the outer case 8. Even if there is, the intended purpose of restraining the three device directly connected terminal main bodies 2 from each other by the steady structure so as not to move, and further suppressing the rotation of the device directly connected terminal is achieved. In addition, since it is a concave spacer having the notch as described above,
It can be retrofitted to a device direct connection terminal connected to an electric device. If the band tightening metal fittings are removed, the steady rest structure can be disassembled.

FIG. 2 shows a second embodiment in which the third means of the present invention is embodied. The equipment cable direct connection terminal for electric power cable is constructed by connecting the branch terminal 14 to the equipment direct connection terminal 2 which is the main circuit. The steady rest structure applied to the connecting portion is shown.

The steady rest structure in the second embodiment is shown in FIG. 2 and, as specifically shown in FIG. 3B, a device direct connection terminal main body 2 and a branch terminal main body 14 which are main circuits. The above-mentioned steady rest spacer 10 is attached to each of the above from the outside, and the connecting spacer 1 is provided between the both spacers.
2 are interposed and are bound together by a tightening band 11 from the entire outer circumference thereof, and the terminals 2 and 14 forming two sets of a main circuit and a branch circuit are bound together. Further, a connection fixing plate 13 which is a steady plate is attached to the rear cylindrical portion of the branch terminal 14 so as to restrain the branch terminals from each other so that a large displacement of the terminal does not occur.

The connecting spacer 12 is the steady rest spacer 1.
As shown in FIG. 3A, the precession spacer 10 has a rubber elasticity similar to that of No. 0.
A curved surface portion 12a that has projections 12b that fit with
And has a gutter-shaped groove 12c through which a tightening band is passed on both side edges. The combination of the connecting spacer 12 with the steady rest spacer 10 and the binding with the tightening band 11 are specifically shown in FIG.

The connecting and fixing plate 13 is, as shown in FIG.
It has three holes 13a matching the branch terminal mounting pitch, and the holes 13a have a hole diameter 1 to 3 mm larger than the outer diameter of the rear cylindrical portion of the branch terminal 14 so that the deviation of the mounting pitch of the branch terminals can be allowed. Further, the connecting and fixing plate 13 prevents the branching terminal 14 from being deformed. Further, a chamfered portion 13b of c5 mm or more, which matches the shape of the branch terminal, is formed so that the connection fixing plate 13 can be reliably set in the rear cylindrical portion without interfering with other portions.

In the second embodiment described above, the precession spacers 10 and the connecting spacers 12 are divided into parts so that the parts have general versatility. An integrated spacer in which these two spacers are integrated is also conceivable. However, in this case,
It is necessary to devise a mounting method.

FIG. 5 shows a third embodiment in which the fifth means of the present invention is embodied. A device directly connected terminal 2 serving as a main circuit.
In addition, a steady rest structure applied to a power cable device direct connection terminal connection portion having a configuration in which a branch terminal 14 is further connected,
A connection fixing plate 13 ', which is a steady plate, is attached to the rear cylindrical portion of the branch terminal 14 to restrain the branch terminals from each other so that a large displacement of the terminals does not occur, and further, the connection fixing plate 13' itself is removed from the outside. The case (equipment storage box) 8 is fastened with a screw 15. Further, the branch terminals 14, Ru der those wearing the steadying spacer 10 having a flexibly adaptable rubber elasticity, tightened and fixed by tightening the band 11 from the outside against the clamping.

The steady rest spacer 10 is specifically shown in FIG. 6 (a), and is the steady rest spacer 1 of the first embodiment.
It is the same as 0.

The connecting and fixing plate 13 ', like the connecting and fixing plate 13 of the first embodiment, has three holes 13a corresponding to the mounting pitch of the branch terminals 14, and the holes 13a are the rear cylinders of the branch terminals 14. The hole diameter is 1 to 3 mm larger than the outer diameter of the portion so that the deviation of the mounting pitch of the branch end can be allowed, and the branching end 14 is not deformed by the connecting and fixing plate 13 '. Further, a chamfered portion 13b of 0.5 mm or more is formed in conformity with the shape of the branch terminal 14 so that the connecting and fixing plate 13 'can be reliably set in the rear cylindrical portion without interfering with other portions. Further, the connection fixing plate 13 'is fixed to a part of the outer case (device storage box) 8 (or the device main body 7) by the arm (13c) or the like, so that the connection fixing plate 13' is prevented from swinging, and the terminal main body is prevented. The steady rest effect of is improved. The arm is provided with a hole 13c for screw fixing.

According to this steady rest structure, it is possible to obtain the same steady rest effect and reinforcement effect against the short circuit electromagnetic force as in the second embodiment described above, and to connect the connecting and fixing plate 13 'to the equipment storage box. It is possible to further improve the above-mentioned effects by screwing and fixing to No. 8. Further, according to this steady rest structure, the mounting pitch of the branch terminals (device direct connection terminals) is small, and it is effective when it is difficult to get a hand between the terminals. That is, not only the connecting and fixing plate but also the steady rest spacer may be attached to the terminal located at a position far from the device,
Such mounting can be easily performed from the front side (door) side of the equipment storage box even if the terminal mounting pitch is small as described above.

[0043]

As described above, according to the first means of the present invention, there is provided a steady rest structure for a device directly connected terminal in which the terminal does not rotate without fixing the cable directly under the device directly connected terminal. In addition, the first problem (objective) of providing a steady rest structure of this kind that can be easily retrofitted after the installation and installation of the device direct connection terminal can be achieved.

According to the second means to the fifth means of the present invention, the first object (objective) can be achieved, and in the case of a mode in which a branch cable is connected, a three-phase branch A second problem (objective) to provide a device direct connection terminal and a steady rest structure for a branch terminal that fixes the cable terminal portion and does not cause bending of a conductor portion connecting the branch terminal and the main circuit terminal due to a short circuit electromagnetic force. Can be achieved.

As described above, according to the device direct connection terminal and the branch terminal steady rest structure of the present invention, it is possible to prevent the loosening of one bolt that connects the device side conductor and the cable side conductor, and to directly connect the device type terminal connection. The reliability of the part can be improved. Further, in the case of having a branch terminal, the branch terminal can be mechanically reinforced, and sufficient strength against short circuit electromagnetic force can be secured.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment in which the first means of the present invention is embodied, in which (a) is a device directly connected terminal and a steady stop structure for a branch terminal is attached, and (b) is a device directly connected. The top view and side view of the steady rest spacer in the steady rest structure for terminals.

FIG. 2 is a side view showing a second embodiment in which the third means of the present invention is embodied, in which (a) is a device directly connected terminal and a steady rest structure for a branch terminal is attached, and (b) is the same vibration. The front view shown in the attachment condition of a stop structure.

3 (a) is a front view and a bottom view showing a specific example of the connecting spacer of the steady structure shown in FIG. 2, and (b) is an installation work for a power cable using the same connecting spacer and the steady spacer. The plane explanatory view which shows an example.

4A and 4B are a front view and a side view showing a specific example of a connecting and fixing plate (precession plate) of the steadying structure shown in FIG.

FIG. 5 is a side view showing a third embodiment in which the fifth means of the present invention is embodied, in which (a) is a device directly connected terminal, and a steady rest structure for a branch terminal is attached, and (b) is the same vibration. The front view shown in the attachment condition of a stop structure.

6A is a plan view and a side view specifically showing the steady rest spacer in the steady rest structure shown in FIG. 5, FIG.
FIG. 3A is a front view and a side view specifically showing a connecting and fixing plate (precession plate) in the steady rest structure.

FIG. 7 is a partial cross-sectional explanatory view showing a typical example of the structure of a power cable device direct connection type terminal connection part (device direct connection terminal) in an exploded state.

8A and 8B show how the device directly connected terminal shown in FIG. 7 is attached to an electric device, where FIG. 8A is a side view and FIG. 8B is a front view.

9A and 9B show another example of how the device directly connected terminal shown in FIG. 7 is attached to an electric device, together with problems, FIG. 9A being a side view and FIG. 9B being a front view.

FIG. 10 is a side view and (b) a front view showing an example of attachment of a power cable device direct connection terminal and a branch terminal to an electric device together with problems.

[Explanation of symbols]

2 Equipment directly connected terminal body (for main circuit) 7 electrical equipment 8 outer case 9 cable support 10 steady rest spacer 10a hole shape 10b groove shape 10c cutout 10d trough 11 tightening band 11a Band tightening bracket 12 Connection spacer 12a Side contact surface 12b Connection protrusion 12c trough 13 Connection fixing plate (rest plate) 13 'Connection fixing plate 13a hole 13b Chamfer 13c Fixing hole (arm) 14 branch terminals 15 screw

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H02G 15/06

Claims (8)

(57) [Claims] 1. A connection between a device-side conductor and a cable-side conductor is 1
In power cables Equipment direct type sealing end of the structure for tightening the bolt of the present, in the method for connecting and fixing the three connection body, using spacers having rubber elasticity between three connection body However, the outer periphery of the spacer is fastened and fixed with a flexible band, and the spacer has a substantially concave shape having a hole shape in the middle and groove shapes on both sides, and the hole shape in the middle has this shape. It has an inner diameter that is almost the same as the outer diameter of the connecting part body to be mounted, and has a notch at one place on the circumference, and the groove shape on both sides has a curvature that matches the outer diameter of the connecting part body. A steady rest structure for a device directly connected terminal, which comes into contact with a range of 120 to 180 ° inside the connection body on both sides. 2. The steady rest structure for a device directly connected terminal according to claim 1, wherein the spacer has a trough-shaped groove corresponding to the width of the band in the concave bottom piece portion. 3. Connection between the device-side conductor and the cable-side conductor is 1
In power cables Equipment direct type sealing end of the structure for tightening the bolt of the present, three methods for connecting and fixing the connection portion body relative to those formed by two pairs connected in the main circuit component and the branch circuit component Then, a steady plate having a hole 1 to 3 mm larger than the outer diameter of the cylindrical portion is detachably attached to the rear cylindrical portions of the three connection body parts far from the device side. A steady rest structure for equipment direct connection terminals and branch terminals, in which three holes are formed at intervals determined by the equipment and one circuit (three phases) is fixed together. 4. A steady rest structure for a device direct connection terminal and a branch terminal according to claim 3, wherein an edge of the steady rest plate facing the connecting portion body side is chamfered to have a c5 mm or more. 5. A connection between a device-side conductor and a cable-side conductor is 1
In power cables Equipment direct type sealing end of the structure for tightening the bolt of the present, three methods for connecting and fixing the connection portion body relative to those formed by two pairs connected in the main circuit component and the branch circuit component Then, a steady plate having a hole larger than the outer diameter of the cylindrical portion by 1 to 3 mm is detachably attached to the rear cylindrical portions of the three connecting portion main bodies far from the device side. Also in the main body of the book connecting part, attach spacers having rubber elasticity, attach a connecting spacer made of an elastic body between the spacers, and fasten and fix the entire two sets of connecting parts with a flexible band. A steady rest structure for equipment directly connected terminals and branch terminals. 6. A connection between a device-side conductor and a cable-side conductor is 1
In power cables Equipment direct type sealing end of the structure for tightening the bolt of the present, three methods for connecting and fixing the connection portion body relative to those formed by two pairs connected in the main circuit component and the branch circuit component Then, a steady plate having a hole 1 to 3 mm larger than the outer diameter of the cylindrical portion is detachably attached to the rear cylindrical portions of the three connection body parts far from the device side. Three holes are formed at intervals determined by the equipment so that one circuit (three phases) can be fixed all together, and the steady rest is attached to the equipment body or equipment storage box. It is detachably fixed to the part of
Steady stop structure for equipment directly connected terminals and branch terminals. 7. The steady rest structure for equipment direct connection terminal and branch terminal according to claim 6, wherein an edge of the steady rest plate facing the connecting portion main body side is chamfered to have a c5 mm or more. 8. A connection between a device-side conductor and a cable-side conductor is 1
In power cables Equipment direct type sealing end of the structure for tightening the bolt of the present, three methods for connecting and fixing the connection portion body relative to those formed by two pairs connected in the main circuit component and the branch circuit component Then, a steady plate having a hole 1 to 3 mm larger than the outer diameter of the cylindrical portion is detachably attached to the rear cylindrical portions of the three connecting portion main bodies far from the device side. It is detachably fixed to the equipment storage box, and furthermore, spacers having rubber elasticity are attached to the three connection main bodies far from the equipment side, and the outer circumference is fastened and fixed with a flexible band. A steady rest structure for equipment directly connected terminals and branch terminals.