JPH10321096A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a switch lightweight and enhance cooling efficiency by integrally forming first and second conductors in an insulating mold, fixing the insulating mold in the bottom and the front top, and forming the insulating mold so as to have a U-shaped cross section. SOLUTION: Since an upper conductor and a lower conductor 24 are assembled in an insulating mold 21 by integrally molding, adjusting of a jig in assembly is made unnecessary, and assembly work is made easy. Positioning accuracy of the upper conductor and the lower conductor 24 in molding of the insulating mold 21 is sufficiently high, and since a vacuum interrupter 25 is on a supporting metal fixture 26, large stresses does not generate in this part. A shunt cooling fin 29 is fixed to a shunt 28 where heat generation is large, when current is passed and an upper cooling fin 30 is fixed to the upper conductor. In addition, a ventilating hole is formed in the upper conductor, and since a ventilation route is ensured as indicated in an arrow, cooling efficiency is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch such as a vacuum circuit breaker applied to power distribution equipment.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram showing a main circuit component of an example of a conventional vacuum circuit breaker, and FIG. 14 is a front view of FIG. In the figure, reference numeral 1 denotes an insulating mold fixed to a fixed frame (not shown), 2 denotes an embedding fitting for being embedded in the bottom of the insulating mold 1 and fixing the insulating mold 1 to the fixed frame, and 3 denotes an insulating mold. The upper conductor 4 is fixed to the upper part of the insulating mold 1 by bolts, and the lower conductor 4 is fixed to the lower part of the insulating mold 1 by bolts.

[0005] Reference numeral 5 denotes a vacuum interrupter for opening and closing a current between the upper conductor 3 and the lower conductor 4. The upper portion of the vacuum interrupter 5 is fixed to the insulating mold 1 via the upper conductor 3 and the upper split terminal 6. ing. Further, a lower portion of the vacuum interrupter 5 is fixed to the insulating mold 1 by a fixing member 7. Furthermore, the outer surface of the vacuum interrupter 5 is made of electrically insulated ceramics 5a.

[0004] Reference numeral 8 denotes the number of upper conductors 3 corresponding to the current capacity.
A plurality of upper cooling fins bolted to
Is a lower split terminal attached to the movable conductor 5b of the vacuum interrupter 5, 10 is a flexible shunt connected between the lower split terminal 9 and the lower conductor 4, and 11 is the same as the upper cooling fin 8. A plurality of lower cooling fins fixed to the lower split terminal 9.

When assembling the main circuit components of such a conventional vacuum circuit breaker, the upper and lower conductors 3 and 4 are first assembled and adjusted by a special jig, and the upper and lower conductors 3 and 4 are assembled. Based on the position, the vacuum interrupter 5 and other components are mounted.

Further, the current at the time of energization flows through the upper conductor 3, the upper split terminal 6, the vacuum interrupter 5, the lower split terminal 9, the shunt 10, and the lower conductor 4 in the order of the route or the reverse route. Further, heat mainly generated in the vacuum interrupter 5, the lower split terminal 9, and the shunt 10 during energization is radiated by the upper cooling fin 8 and the lower cooling fin 11. Note that the arrows in the figure indicate ventilation paths during convection heat radiation.

Further, the rigidity of the insulating mold 1 is set so as to prevent damage due to the electromagnetic force of the accident current, and the lower part of the vacuum interrupter 5 is firmly fixed to the insulating mold 1. Furthermore, the electrical insulation is maintained by the insulating mold 1, the air, and the ceramics 5 a on the outer surface of the vacuum interrupter 5.

[0008]

In the main circuit components of the conventional vacuum circuit breaker constructed as described above, it takes a long time to adjust the jig at the time of assembling, and the number of parts is large. Was. Further, it is necessary to increase the rigidity of the insulating mold 1 against external electromagnetic force or the like, and it has not been possible to achieve a sufficient weight reduction. In addition, the cooling fins 8 and 11 are away from the heat-generating portion and the ventilation path is not properly established with respect to the heat generated during the energization, so that the cooling efficiency is low.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can reduce the number of parts, facilitate the assembling work, and reduce the weight. It is an object of the present invention to obtain a switch that can be designed and that can improve the cooling efficiency.

[0010]

According to a first aspect of the present invention, there is provided a switchgear having a U-shaped cross-section insulating mold having fixing portions for a fixing frame provided at a bottom portion and an upper portion of a front surface, and integrally formed with the insulating mold. And a switch main body provided in the insulating mold and opening and closing a current between the first and second conductors.

According to a second aspect of the present invention, the fixed side of the switch body is directly fixed to the first conductor, and the movable side of the switch body is connected to the second conductor via a flexible shunt. And the switch body is mounted on a support member fixed to the insulating mold.

According to a third aspect of the present invention, in the switch, an upper cooling fin is attached to a fixed portion of the switch body to the first conductor, and shunt cooling is provided to a connection portion of the shunt to the second conductor. The fins are attached.

According to a fourth aspect of the present invention, there is provided the switchgear, wherein the first conductor is disposed so as to cross the upper opening of the insulating mold, and the first conductor is provided with a ventilation hole. is there.

According to a fifth aspect of the present invention, there is provided a switch, wherein a ventilation path is provided in at least one of the first and second conductors for leading a part of the air in the insulating mold to the outside. Are provided with a plurality of radiating fins on the inner wall surface.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is a configuration diagram showing main circuit components of a vacuum circuit breaker according to Embodiment 1 of the present invention, FIG. 2 is a front view showing the appearance of FIG. 1, FIG. 3 is a rear view of FIG. 2, and FIG. 5, FIG. 5 is a bottom view of FIG. 2, and FIG. 6 is an explanatory view showing a state in which the apparatus of FIG. 1 is fixed to a fixing frame.

In FIG. 6, reference numeral 21 denotes an insulating mold having a substantially U-shaped cross section fixed to the fixed frame 20 as shown in FIG. 6, and the fixed frame 20 is, for example, a carriage on which an operation mechanism is mounted. Reference numeral 22 denotes a plurality of embedding fittings which are embedded in the bottom and upper portions of the insulating mold 21 and serve as fixing portions for fixing the insulating mold 21 to the fixing frame 20.
A fold 21a is formed. 23 is an insulation mold 2
1 is an upper conductor as a first conductor integrally formed in the insulating mold 21 so as to cross the upper opening, and 24 is a lower conductor as a second conductor integrally formed in a lower portion of the insulating mold 21. is there. FIG. 7 is a perspective view showing the insulating mold 21 of FIG.

Reference numeral 25 denotes a vacuum interrupter as a switch body for opening and closing a current between the upper conductor 23 and the lower conductor 24, and an upper portion (fixed side) of the vacuum interrupter 25.
Are directly fixed to the upper conductor 23. The lower portion of the vacuum interrupter 25 is mounted on a support member 26 fixed to the insulating frame 21. Further, the outer surface of the vacuum interrupter 25 is made of an electrically insulated ceramic 25a.

Reference numeral 27 denotes a movable conductor 2 of the vacuum interrupter 25.
A lower cooling terminal 27 is integrally formed with the lower split terminal 27 attached to the lower split terminal 27. 28 is a flexible shunt connected between the lower split terminal 27 and the lower conductor 24, 29 is a shunt 28
A shunt cooling fin attached to the connection between the upper conductor 23 and the lower conductor 24;
1 is a cover that covers the front surface of the insulating mold 21. In FIG. 5, illustration of the structure inside the insulating mold 21 is omitted.

FIG. 8 is a plan view showing the upper conductor 23 of FIG.
FIG. 9 is a side view of FIG. In the figure, the upper conductor 23
Are fixed in the shape of a vane plate, and fixing holes 23a for fixing both the vacuum interrupter 25 and the upper cooling fin 30 together.
And a ventilation hole 23b.

Next, the operation will be described. An insulating rod (not shown) is connected to the movable conductor 25b of the vacuum interrupter 25, and the operating force of the operating mechanism in the fixed frame 20 is transmitted to the movable conductor 25b via the insulating rod, thereby opening and closing the vacuum interrupter 25. An operation is performed.

In the main circuit components of such a vacuum circuit breaker, since the upper conductor 23 and the lower conductor 24 are incorporated into the insulating mold 21 by integral molding, it is not necessary to adjust the jig at the time of assembly, and the number of parts is reduced. And the assembling work can be facilitated. In addition, the positioning accuracy of the upper conductor 23 and the lower conductor 24 at the time of molding the insulating mold 21 is sufficiently high, and the vacuum interrupter 25 is merely placed on the support fitting 26, so that a large stress is applied to this portion. Will not occur.

Further, since the insulating mold 21 is fixed to the fixed frame 20 not only at the bottom but also at the upper part of the front surface, the rigidity against an external force such as an electromagnetic force of a fault current is improved, and the main purpose is electrical insulation. The left and right side walls can be made thinner. That is, the weight of the insulating mold 21 can be reduced.

Further, a shunt 2 which generates a large amount of heat when energized
8, a shunt cooling fin 29 is directly attached to the upper conductor 23, and an upper cooling fin 30 is directly attached to the upper conductor 23. Further, a ventilation hole 23b is provided in the upper conductor 23, and a ventilation path is formed as shown by an arrow in FIG. Is secured,
Cooling efficiency can be improved.

Furthermore, since the periphery of the ventilation path is surrounded by the insulating mold 21 and the cover 31, the ceramics 5a on the outer surface of the vacuum interrupter 25 can be kept clean. Also, the folds 2 are formed on the insulation mold 21.
Since 1a is provided, stable withstand voltage characteristics can be obtained.

Embodiment 2 Next, FIG. 10 is a plan view showing an upper conductor according to a second embodiment of the present invention, FIG. 11 is a front view seen from the right side of FIG. 10, and FIG.
It is XII sectional drawing. In this example, the upper conductor 23 is provided with a ventilation path 23 c having one end open into the insulating mold 21 (FIG. 1) and the other end opened outside the insulating mold 21. Further, a plurality of radiating fins 23d are provided on the inner wall surface of the ventilation passage 23c. Other configurations are the same as those in the first embodiment.

When such an upper conductor 23 is used, a part of the air passing through the insulating mold 21 is generated by the ventilation passage 23c.
The heat generated in the upper conductor 23 is removed from the inside, and then released to the outside of the upper conductor 23. Further, since the upper conductor 23 is connected to a mating conductor (not shown) via a connection piece (not shown) that allows outflow of air, air passing through the ventilation path 23c is externally connected to the connection piece. Released to

Therefore, the heat generated in the upper conductor 23 is released not only from the outside but also from the inside, so that the cooling efficiency can be further improved. Further, since the heat radiation fins 23 d are provided inside the upper conductor 23 instead of outside, it does not hinder the integral molding of the upper conductor 23 into the insulating mold 21.

In the above example, the ventilation path 23c and the radiation fins 23d are provided only in the upper conductor 23, but they may be provided in the lower conductor 24. Further, in the above example, the vacuum circuit breaker has been described, but the present invention can be applied to other switches as long as the switch body is disposed in the insulating mold.

[0029]

As described above, in the switch according to the first aspect of the present invention, the first and second conductors are formed integrally with the insulating mold, and the insulating mold is fixed to the fixed frame at the bottom portion and the front upper portion. In addition, since the insulating mold has a U-shaped cross section, the number of parts can be reduced, the assembling work can be facilitated, the weight can be reduced, and the ventilation path can be secured. Cooling efficiency can be improved.

According to a second aspect of the present invention, the fixed side of the switch body is directly fixed to the first conductor, and the movable side of the switch body is connected to the second conductor via a flexible shunt. In addition, since the switch body is placed on the support member fixed to the insulating mold, it is possible to prevent a large stress from being generated in the switch body due to displacement of the first and second conductors during molding. be able to.

In the switch according to the third aspect of the present invention, an upper cooling fin is attached to a fixed portion of the switch body to the first conductor, and a shunt cooling fin is attached to a connection portion of the shunt to the second conductor. Therefore, the cooling efficiency can be further improved.

[0032] In the switch according to the fourth aspect of the present invention, the first conductor is disposed so as to cross the upper opening of the insulating mold, and the first conductor is provided with a ventilation hole.
A stable ventilation path can be secured, and cooling efficiency can be improved.

The switch according to the fifth aspect of the present invention comprises a first switch and a second switch.
Inside at least one of the conductors, a ventilation path for guiding a part of the air in the insulating mold to the outside is provided, and a plurality of radiation fins are provided on the inner wall surface of the ventilation path, so that the cooling efficiency is further improved. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing main circuit components of a vacuum circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is a front view showing the appearance of FIG.

FIG. 3 is a rear view of FIG. 2;

FIG. 4 is a plan view of FIG. 2;

FIG. 5 is a bottom view of FIG. 2;

FIG. 6 is an explanatory view showing a fixed state of the device of FIG. 1 to a fixed frame.

FIG. 7 is a perspective view showing the insulating mold of FIG. 1;

FIG. 8 is a plan view showing an upper conductor of FIG. 1;

FIG. 9 is a side view of FIG.

FIG. 10 is a plan view showing an upper conductor according to a second embodiment of the present invention.

FIG. 11 is a front view as viewed from the right side of FIG. 10;

12 is a sectional view taken along line XII-XII of FIG.

FIG. 13 is a configuration diagram showing a main circuit configuration portion of an example of a conventional vacuum circuit breaker.

FIG. 14 is a front view of FIG.

[Explanation of symbols]

Reference Signs List 20 fixed frame, 21 insulating mold, 22 embedded metal fitting (fixed part), 23 upper conductor (first conductor), 23b
Ventilation hole, 23c ventilation path, 23d radiation fin, 24
Lower conductor (second conductor), 25 vacuum interrupter (switch body), 26 support member, 28 shunt, 2
9 shunt cooling fins, 30 upper cooling fins.

Claims (5)

[Claims] 1. An insulating mold having a U-shaped cross section provided with fixing portions for a fixing frame at a bottom portion and an upper portion of a front surface, first and second conductors integrally formed with the insulating mold, and the insulating mold. And a switch main body provided inside the switch and for opening and closing the current between the first and second conductors. 2. The switch body has a fixed side directly fixed to a first conductor, a movable side connected to a second conductor via a flexible shunt, and an insulating mold. 2. The switch according to claim 1, wherein the switch is mounted on a fixed support member. 3. The switch body is characterized in that an upper cooling fin is attached to a fixed portion of the switch body to the first conductor, and a shunt cooling fin is attached to a connection portion of the shunt to the second conductor. The switch according to claim 2, wherein 4. The method according to claim 1, wherein the first conductor is disposed so as to cross an opening at an upper portion of the insulating mold, and the first conductor is provided with a ventilation hole. The switch according to claim 3. 5. A ventilation path through which at least one of the first and second conductors leads a portion of the air in the insulation mold to the outside is provided. The switch according to any one of claims 1 to 4, wherein a plurality of radiating fins are provided.