JP6687133B2 - Switch gear - Google Patents

Description

  The present invention relates to a switchgear structure, and more particularly to a switchgear structure including a ventilation method for cooling the inside of a housing.

  A conventional switchgear has a circuit breaker room, a cable room, and a main bus room, which are vertically separated in the housing and are separated from each other. A branch duct is provided that extends from the ventilation intake duct and extends vertically in the housing. Inside the ventilation intake duct and the branch duct, a plurality of flappers (ventilation valves) for opening and closing the flow of air in the duct are provided.

  The conventional flapper for opening and closing this duct has a structure in which two plates are connected by a hinge. During normal operation of the switchgear, this flapper takes in outside air from the ventilation intake duct without blocking the duct, cools the inside of the switchgear housing, and exhausts it to the outside via a branch duct. It When a short circuit occurs and an arc is generated, the internal pressure rapidly rises, the flapper is pressed to close the duct, and the arc is prevented from being discharged to the outside of the apparatus.

JP 2000-228803 A

  Since this flapper connects two plates using a hinge, the number of parts increases and the cost increases. In addition, it is necessary to make detailed adjustments to the installation angle and changes in angle due to stress so that the operation of closing the duct due to the rise in pressure inside the case due to the occurrence of an arc during a short circuit can be performed stably. There is a problem that it takes time and work efficiency is poor.

The present invention has been made in order to solve such a problem, and a casing for partitioning and accommodating a circuit breaker chamber, a cable chamber, and a main bus chamber, and a ventilation duct communicating between the inside and outside of the casing, A perforated frame having ventilation holes that are air passages inside the ventilation duct, and a flapper that is one flat portion connected to the bent portion and the other flat portion that is connected to the bent portion by bending the plate material into a dogleg shape. The fixed part is fixed on the inner surface of the ventilation duct, not on the perforated frame that is flush with the ventilation hole.The bent part is adjacent to the inner side of the perforated frame inside the ventilation duct. And an arc prevention frame disposed in such a manner that the arc prevention frame is provided.

  According to the present invention, since it is not necessary to use a hinge for the flapper, the number of parts is small, the cost is low, and fine adjustment is not required. Therefore, a switchgear with high work efficiency can be obtained.

It is a side sectional view showing an internal configuration of a switchgear according to Embodiment 1 of the present invention. It is a perspective view which shows the structure of the arc prevention frame which concerns on Embodiment 1 of this invention. It is a perspective view which shows the shape of the perforated frame which concerns on Embodiment 1 of this invention. FIG. 3 is a cross-sectional view showing the structure inside the ventilation duct during normal operation according to Embodiment 1 of the present invention. It is sectional drawing which shows the structure in the ventilation duct at the time of internal arc generation which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 6 of this invention. It is sectional drawing which shows the structure in the ventilation duct which concerns on Embodiment 7 of this invention. (A) During normal operation, (b) When internal arc occurs. It is a perspective view which shows the structure of the arc prevention frame which concerns on Embodiment 8 of this invention. It is a perspective view which shows the structure of the arc prevention frame which concerns on Embodiment 9 of this invention. It is a perspective view which shows the structure of the arc prevention frame which concerns on Embodiment 10 of this invention. It is a figure which shows the structure of the arc prevention frame which concerns on Embodiment 11 of this invention. (A) Perspective view, (b) side sectional view. It is a figure which shows the structure of the arc prevention frame which concerns on Embodiment 12 of this invention. (A) Perspective view, (b) side sectional view. It is a figure which shows the structure of the arc prevention frame which concerns on Embodiment 13 of this invention. (A) perspective view, (b) side sectional view, (c) perspective view showing an operating state. It is a figure which shows the structure of the arc prevention frame which concerns on Embodiment 14 of this invention. (A) Perspective view, (b) side sectional view. It is a side surface sectional view showing the structure of the perforated frame concerning Embodiment 15 of the present invention. It is a perspective view which shows the structure of the perforated frame which concerns on Embodiment 16 of this invention. It is a perspective view which shows another structure of the perforated frame which concerns on Embodiment 16 of this invention. It is a figure which shows the structure of the arc prevention frame which concerns on Embodiment 17 of this invention. (A) Perspective view, (b) side sectional view. It is sectional drawing which shows the ventilation duct periphery which concerns on Embodiment 18 of this invention. (A) During normal operation, (b) When internal arc occurs. It is a figure which shows the structure of the ventilation duct periphery and slit board which concern on Embodiment 19 of this invention. (A) Normal operation, (b) Internal arc occurrence, (c) Front view of a slit plate. It is a perspective view which shows the structure of the arc prevention frame which concerns on Embodiment 20 of this invention.

  In the description of the embodiments and each of the drawings, parts denoted by the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
FIG. 1 is a side sectional view showing the structure of the switchgear 100 according to the first embodiment. The switch gear 100 has an upper circuit breaker room 2a, a lower circuit breaker room 2b, an upper cable room 3a, a lower cable room 3b, an upper main bus room 4a, a lower main bus room 4b, etc., which partition the inside of the housing 1. The rooms are separated from each other. A ventilation duct 5 is provided below the partitioned lower circuit breaker chamber 2b. Normally, the ventilation duct 5 is provided from the outside through the ventilation duct 5 to cool the inside of the casing 1 and to provide the upper portion of the casing 1. Exhaust from the ventilation cylinder 6.

  2 and 3 show an arc prevention frame 7a and a perforated frame 9a, which are mounted inside the ventilation duct 5, respectively. The arc prevention frame 7a shown in FIG. 2 has a structure in which a plate material is bent, and one flat portion connected to the bent portion has a flapper 10a having a function as a shutter that opens and closes the ventilation duct 5 as described later. The other flat part is a fixing part for fixing inside the ventilation duct 5. Slits (cuts) 8 are formed in the bent portion, so that the bent portion is more easily deformed than other portions. The perforated frame 9a shown in FIG. 3 has a structure in which a plurality of ventilation holes 11 are formed in a flat plate material.

  In the present embodiment, the arc prevention frame 7a and the perforated frame 9a are both formed by processing using an iron plate as the plate material, but the invention is not limited to the iron plate, and commonly used metals such as copper and aluminum. Plates can be used. Further, the size of the slit 8 of the arc prevention frame 7a, the bending angle, etc. are not particularly limited, and can be determined in consideration of the operation, workability, etc. of the arc prevention frame 7a described later. Further, the number and size of the ventilation holes 11 formed in the perforated frame 9a are not particularly limited, and can be determined in consideration of the operation and workability of the flapper 10a described later.

  FIG. 4 is a cross-sectional view of the ventilation duct 5 to which the arc prevention frame 7a and the perforated frame 9a are attached, and shows a state in which the switch gear 100 is operating normally. In the figure, the left side shows the outside of the casing 1 of the switchgear 100, and the right side shows the inside (back side) of the casing 1. Inside the ventilation duct 5, a perforated frame 9a is arranged on the outside and an arc prevention frame 7a is arranged on the back side. The arc prevention frame 7a has its bent portion adjacent to the perforated frame 9a, that is, the bent portion. Is installed facing outward. The white arrow 12 shown in FIG. 4 indicates the flow of air when cooling air is taken in from the outside.

  Generally, the temperature of the inside of the casing 1 of the switchgear 100 rises, so that outside air is taken in from the ventilation duct 5 due to the temperature difference, the inside of the casing 1 is cooled, and the air is exhausted from the ventilation cylinder 6 provided at the upper portion. It A fan (not shown) may be provided in the vicinity of the arc prevention frame 7a and the perforated frame 9a in order to positively introduce the outside air into the housing 1. By using the fan, the outside air can be more efficiently taken into the ventilation duct 5.

  FIG. 5 shows a state in which a short circuit occurs in the housing 1 of the switch gear 100 and an internal arc is generated. In the figure, the black arrow 13 indicates the flow of a high temperature, high pressure arc. In the case of FIG. 5, the high-temperature, high-pressure arc blown from the inside of the housing 1 hits the arc prevention frame 7a from the right side as shown by the black arrow 13, and the bent portion of the arc prevention frame 7a where the slit 8 is formed is Stretched (angle changed).

  When the arc prevention frame 7a is extended by the arc and pressed against the perforated frame 9a, the flapper 10a of the arc prevention frame 7a closes the ventilation hole 11 of the perforated frame 9a, and the arc moves the ventilation duct 5 further. It cannot flow back and does not jet out of the housing 1. As described above, when a short circuit occurs, the bent portion of the arc prevention frame 7a is stretched, and the ventilation duct 5 is closed by the flapper 10a, so that the arc ejection to the outside of the switch gear 100 can be prevented.

  Conventionally, the arc preventing frame 7a has a bent portion that can be operated by using a hinge or the like, and the hinge portion is stretched due to generation of an arc due to a short circuit. However, in this embodiment, since the slit 8 is formed in the bent portion and the arc prevention frame 7a is formed, adjustment is easy, and since no hinge or the like is used, the number of parts is small and the cost is also reduced. be able to.

  In the present embodiment, three ventilation holes 11 are formed in the perforated frame 9a, but there is no particular limitation, and one or two ventilation holes or three or more ventilation holes may be used. You can However, when the size of each ventilation hole 11 is large, foreign matter may be taken in at the same time as ventilation and the device may be damaged. Further, when each ventilation hole 11 is small, the ventilation holes 11 may be blocked by foreign matter taken in at the same time as ventilation, and ventilation may not be performed smoothly. Therefore, it can be said that about 2 to 5 ventilation holes 11 are preferable.

Embodiment 2.
In this embodiment, the basic configuration of the switchgear 100 is the same as that of the first embodiment, and the upper circuit breaker chamber 2a, the lower circuit breaker chamber 2b, the upper cable chamber 3a, which are partitioned in the casing 1, The lower cable room 3b, the upper main bus room 4a, the lower main bus room 4b, etc. are provided, and the rooms are spaced apart from each other. A ventilation duct 5 is provided below the partitioned lower circuit breaker chamber 2b, and normally, the ventilation duct 5 is sucked from the outside to cool the inside of the casing 1 and the ventilation provided above the casing 1. Exhaust from the cylinder 6.

  It is also the same as the first embodiment in that the perforated frame 9a having the ventilation hole 11 and the arc preventing frame 7a formed of a bent structure are arranged in the ventilation duct 5 without using a hinge or the like. However, in the first embodiment, a pair of perforated frame 9a and arc prevention frame 7a are arranged in the ventilation duct 5, but in the present embodiment, as shown in the cross-sectional view of the ventilation duct 5 in FIG. The difference is that two sets of the perforated frame 9a and the arc prevention frame 7a are arranged side by side in the same direction.

  FIG. 6 shows a state in which the switchgear 100 is operating normally and the outside air is taken in from the ventilation duct 5 to cool the inside of the housing 1. If a short circuit occurs and an internal arc occurs, the internal pressure will increase. At this time, the bent portion of the arc prevention frame 7a is extended, and the ventilation hole 11 of the perforated frame 9a is closed by the flapper 10a to prevent the arc from being ejected to the outside as in the first embodiment.

  In this embodiment, two sets of the arc preventing frame 7a and the perforated frame 9a are arranged in the ventilation duct 5. Therefore, foreign matter and the like enter, obstruct the movement of the flapper 10a, and at the time of an arc, the bent portion of the first arc prevention frame 7a cannot be extended, and the ventilation hole 11 of the perforated frame 9a can be closed. Even if it is not possible, the other pair of arc prevention frames 7a operates to close the ventilation hole 11. Therefore, similar to the first embodiment, in addition to the features that the adjustment is easy and the cost can be reduced, the certainty of the operation can be enhanced and the arc prevention effect can be enhanced.

Embodiment 3.
In this embodiment, the basic structure is the same as that of the second embodiment. In the second embodiment, two sets of the arc prevention frame 7a and the perforated frame 9a are arranged on the same side surface in the ventilation duct 5, and the outside air taken in during the normal operation is the arc prevention frame 7a. The flapper 10a is arranged so as to pass over it. However, in the present embodiment, as shown in FIG. 7, the arc prevention frame 7a is different in that one side of the ventilation duct 5 is formed on the lower surface and the other side is formed on the upper surface.

  During normal operation, the outside air taken in passes through the upper part of the flapper 10a of the one arc prevention frame 7a and the lower part of the other flapper 10. Therefore, as shown by the broken line in the figure, the taken-in outside air meanders and passes through the ventilation duct 5, so that the vicinity of the ventilation duct 5 can be cooled more efficiently.

Fourth Embodiment
In the present embodiment, the structure is basically the same as that of the third embodiment, and two sets of arc preventing frames 7a and perforated frames 9b are arranged in the ventilation duct 5 upside down. In the third embodiment, the ventilation hole 11 formed in the perforated frame 9a is formed substantially in the center of the perforated frame 9a, but in the present embodiment, the ventilation hole 11 is formed in the central portion of the perforated frame 9b. However, they are different in that they are formed in a portion that is eccentric in one direction.

  As shown in the sectional view of the ventilation duct 5 of the present embodiment in FIG. 8, two sets of arc prevention frames 7a and perforated frames 9b are arranged inside the ventilation duct 5. In the perforated frame 9b paired with the arc prevention frame 7a disposed on the lower surface of the ventilation duct 5, the ventilation hole 11 is formed below the center of the perforated frame 9b, and the arc prevention frame disposed on the upper surface. In the perforated frame 9b forming a pair with 7a, a ventilation hole 11 is formed in a portion above the center.

  FIG. 8 shows the structure of the ventilation duct 5 at the time of normal operation of the switch gear 100. By arranging the ventilation holes 11 of the present embodiment, as shown by the broken line in the figure, The outside air taken in for cooling the inside of the housing 1 largely meanders and flows, so that the vicinity of the ventilation duct 5 can be cooled more efficiently.

Embodiment 5.
In this embodiment, the basic structure is the same as that of the first embodiment, and the ventilation duct 5 is provided with a pair of arc prevention frames 7a and perforated frames 9a. In the present embodiment, as shown in the cross-sectional view of the ventilation duct 5 of the present embodiment in FIG. 9, a square box-shaped shielding material 14 is provided on the device inner side of the arc prevention frame 7a.

  When the switch gear 100 is normally operating, outside air for cooling the inside of the housing 1 is taken in from the left side of the drawing, and when a short circuit occurs, an arc is generated, and a direction indicated by a black arrow 13 in FIG. The pressure of the internal arc is applied to. Due to this pressure, the bent portion of the arc prevention frame 7a is extended to close the perforated frame 9a and prevent the arc from being emitted to the outside (in FIG. 9, the flapper 10a does not close the ventilation hole 11 of the perforated frame 9a. Shows the situation).

  As shown in the first embodiment, when an arc is generated inside the device, the pressure is applied to the outside to press the flapper 10a of the arc prevention frame 7a and the ventilation hole 11 of the perforated frame 9a. Close up. In the present embodiment, since the shielding material 14 is provided adjacent to the arc prevention frame 7a, the region in which the arc flows is narrowed and the arc speed is increased. Along with this, the pressure with which the arc pushes the flapper 10a also increases, and the ventilation hole 11 of the perforated frame 9 can be closed at high speed by the flapper 10a of the arc prevention frame 7a, thereby more accurately preventing the arc from being emitted to the outside. It has the feature of being able to.

Sixth Embodiment
In this embodiment, the basic structure is the same as that of the first embodiment, and the ventilation duct 5 is provided with a pair of arc prevention frames 7b and perforated frames 9a. In the present embodiment, as shown in the cross-sectional view of the ventilation duct 5 of the present embodiment in FIG. 10, in the first embodiment and the like, the arc protection frame 7a has only one bent portion. In addition to one bent portion, it also has one bent portion.

  Therefore, in the present embodiment, the bending angle is large in the upper portion of the arc prevention frame 7b and small in the lower portion. Therefore, in the present embodiment, during normal operation of the switch gear 100, the flow of the outside air taken in for cooling is taken into the housing 1 without being obstructed by the arc prevention frame 7b. On the other hand, when an arc is generated due to a short circuit, the flapper 10b of the arc prevention frame 7b is apt to receive the pressure of the arc generated from the inside, so that it is pressed against the perforated frame 9a at high speed and the ventilation hole 11 can be closed at high speed.

  Although the arc prevention frame 7b and the perforated frame 9a shown in the present embodiment are one set, the combination and the number and arrangement of the arc prevention frame 7b and the perforated frame 9a are the same as those in the second to fifth embodiments. The configuration shown can be used.

Embodiment 7
In this embodiment, the basic structure is the same as that of the first embodiment, and the ventilation duct 5 is provided with a pair of arc preventing frames 7a and perforated frames 9a. The present embodiment is different in that the arc prevention frame 7a is provided at a constant distance from the perforated frame 9a. 11 (a) and 11 (b) are sectional views of the ventilation duct 5 according to the present embodiment. FIG. 11A shows a state in which the switch gear 100 is normally operating, and FIG. 11B shows a state in which the ventilation hole 11 of the perforated frame 9a is blocked by the flapper 10a by the pressure of the arc due to the short circuit. The arrow portion in the drawing indicates the portion where the arc prevention frame 7a and the perforated frame 9a are arranged with a certain distance.

  As shown in FIG. 11A, when the switch gear 100 is normally operating, the arc prevention frame 7a does not hinder the flow of outside air, which is the same as the structure of the first embodiment and the like. As shown in FIG. 11 (b), when the arc prevention frame 7 a closes the ventilation hole 11 with an arc generated by a short circuit, a certain distance is maintained rather than the perforated frame 9 a and the arc prevention frame 7 a being in close contact with each other. With this, the flapper 10a is pressed against the ventilation hole 11 more strongly, and the ejection of the arc to the outside can be more completely blocked.

Eighth embodiment.
Similar to the first embodiment, the present embodiment is the same in that the perforated frame 9a is installed inside the ventilation duct 5. However, in one arc prevention frame 7c arranged adjacent to the perforated frame 9a, the flapper 10c is a flapper 10c having a vertical cutout as shown in FIG. 12, and is provided in the ventilation hole 11 of the perforated frame 9a. Correspondingly, it has a structure in which it is divided into three in the vertical direction.

  When the flapper 10c having a vertical cutout is used, there is a gap in the flapper 10c, so that the outside air taken in during normal operation of the switch gear 100 is not hindered, and the efficiency of cooling the inside of the housing 1 is high. On the other hand, when a short circuit occurs, with respect to closing the ventilation hole 11 of the perforated frame 9a, the same effect can be obtained as compared to the flapper 10a which is not divided as in the first embodiment. The number of divisions of the flapper 10c having a notch in the vertical direction is not particularly limited, and it is important that it corresponds to the number of ventilation holes 11 of the perforated frame 9a.

Ninth Embodiment
In the eighth embodiment, the flapper 10c installed adjacent to the perforated frame 9a inside the ventilation duct 5 has a notch in the vertical direction, and has a structure in which the bent portion and the fixed portion are integrated. In the present embodiment, the installation position is the same, but the shape of the flapper 10d is that the entire arc prevention frame 7d including the bent portion and the fixed portion is divided as shown in FIG. Is different.

  The arc prevention frames 7d used in the present embodiment make up a set of three, which corresponds to the number of ventilation holes 11 formed in the perforated frame 9a. When the switch gear 100 is normally operating, since there is a gap between the flappers 10d, the internal cooling efficiency can be increased without hindering the outside air taken in. At the time of a short circuit, the ventilation hole 11 can be closed by the pressure of the internal arc, and the same effect as in the case of using the undivided flapper 10a of the first embodiment or the like can be obtained. Although the divided arc prevention frame 7d is composed of three pieces, it is not limited to this and it is important that the number is equal to the number of ventilation holes 11 of the perforated frame 9a.

Embodiment 10.
In the present embodiment, the basic configuration is the same as that of the first embodiment, but as in the first embodiment, the flapper 10a of the arc prevention frame 7a operates in the vertical direction due to the pressure of the internal arc, The difference is that instead of blocking the ventilation hole 11, an arc prevention frame 7e that operates sideways as shown in FIG. 14 is used.

  By using the sideways arc prevention frame 7e in this way, the arc prevention frame 7e can be attached even when the ventilation duct 5 is bent and it is difficult to attach the arc prevention frame 7a to the lower surface of the ventilation duct 5. It is possible to cool the inside of the housing 1 of the switchgear 100 by taking in outside air during normal operation, and to close the ventilation hole 11 of the perforated frame 9c by the sideways flapper 10e due to the pressure of the arc when a short circuit occurs. Can be prevented.

  In the present embodiment, the horizontal arc prevention frame 7e is used in the integrated state without dividing the flapper 10e. However, the flapper 10e which operates in the vertical direction shown in the eighth and ninth embodiments is used. As illustrated by 10c and 10d, even the flapper 10f divided into a plurality of parts corresponding to the positions of the ventilation holes 11 can be used and the same effect can be obtained.

Eleventh Embodiment
In this embodiment, the basic form is the same as that of the first embodiment, and only the structure of the bent portion of the arc prevention frame 7f is different from that of the first embodiment. In the first embodiment, the slit 8 is formed so that it is easier to bend than the other portions of the arc prevention frame 7a, and the angle is easily changed after folding, but in the present embodiment, the plate thickness of the bent portion is large. Is different from the other portions (thin portion 15 is provided).

  FIG. 15 shows the arc prevention frame 7f used in this embodiment. FIG. 15A is a perspective view of the arc prevention frame 7f, and FIG. 15B is a side sectional view thereof. An inner surface of the bent portion of the arc prevention frame 7f is thinly removed to form a thin portion 15. This facilitates the bending process of the arc prevention frame 7f, and makes it easier to extend the bent portion even by the pressure of the arc at the time of a short circuit, thereby reliably blocking the ventilation hole 11 and preventing the arc from being emitted.

Twelfth Embodiment
In this embodiment, the basic form is the same as that of the first embodiment, and only the structure of the bent portion of the arc prevention frame 7g is different from that of the first embodiment. In the first embodiment, the slit 8 is formed so that it can be bent more easily than the other parts of the plate material, and the angle of the flapper 10a can be easily changed after the bending. However, in the present embodiment, arc prevention is performed at the bent part. The difference is that a metal portion 16 different from the main body portion of the frame 7g is used.

  FIG. 16 shows an arc prevention frame 7g used in this embodiment. 16A is a perspective view of the arc prevention frame 7g, and FIG. 16B is a side sectional view thereof. It can be seen that a metal portion 16 different from the main body portion is connected to the bent portion of the arc prevention frame 7g. Specifically, the arc prevention frame 7g is made of an iron plate that has been subjected to a surface treatment for corrosion prevention, but the bent portion is made of an aluminum plate and is joined by using an adhesive.

  The material used for the arc prevention frame 7g used in the present embodiment, the material used for the bent portion, and the like are not particularly limited, but the arc prevention frame 7g as a whole is improved in workability at the bent portion to generate an internal arc. Considering that the pressure of the arc sometimes makes it easier to stretch the bent portion, it is preferable to use a material that can be bent more easily than a material used for the main body portion of the arc prevention frame 7g.

  By using the arc prevention frame 7g using a metal plate that is easier to bend in the bent portion, it can be easily extended by the pressure of the arc at the time of a short circuit, and the ventilation hole of the perforated frame 9a by the pressure of the arc when the arc occurs. It is possible to reliably close 11 and prevent arc exhaust from being emitted from the switchgear 100.

Thirteenth Embodiment
This embodiment is the same as Embodiment 1 in that the perforated frame 9a shown in FIG. 3 is arranged in the ventilation duct 5, but the arc prevention frame installed immediately after the perforated frame 9a. The shape of 7h is different. In the present embodiment, the flapper 10g for preventing rebound shown in FIG. 17 is used for the arc preventing frame 7h. FIG. 17 (a) is a perspective view of the arc preventing frame 7h with bounce prevention, and FIG. 17 (b) is a side sectional view. In the arc preventing frame 7h with bounce prevention, a dogleg shaped stopper 17 is attached to a normal arc preventive frame 7a with a rivet 19, and as shown in FIG. 17 (b), the tip portion of the dogleg shaped stopper 17 is attached. A constant gap 18 is provided between the flapper and the flapper 10g.

  During normal operation of the switch gear 100, the outside air is taken in to cool the inside of the housing 1 as in the first embodiment and the like. When a short circuit occurs, the internal pressure increases due to the generation of an arc, and the bent portion of the arc-prevention frame 7h with bounce prevention shown in FIGS. 17 (a) and 17 (b) is stretched and the ventilation hole 11 of the perforated frame 9a is closed. It is the same as that of the first embodiment and the like in that it is closed and the arc is prevented from being ejected to the outside.

  When an arc occurs due to a short circuit, the arc prevention frame 7h closes the ventilation hole 11 at a very high speed. Therefore, it may take a little time for the arc prevention frames 7h to hit each other and bounce back to be closed again due to the internal pressure. It is conceivable that the arc will leak to. However, in the present embodiment, at the moment when the arc-preventing frame 7h with bounce prevention blocks the ventilation hole 11 of the perforated frame 9a, as shown in FIG. 17 (c), the ventilation hole 11 has a dogleg shape. Since the stopper 17 engages with each other and prevents rebound, it is possible to prevent the arc from being ejected to the outside.

  In the present embodiment, the combination of the dogleg-shaped stopper 17 and the ventilation hole 11 of the perforated frame 9a is used to prevent the flapper 10g from bouncing, but the combination is not limited to this, and they are engaged with each other. Also, other shapes can be used as long as the movement is restricted.

Fourteenth Embodiment
In this embodiment, the basic configuration is the same as that of the first embodiment and the like, but the difference is that the repulsive force when the metal plate is bent is used for the operation of the flapper 10h. In the present embodiment, the iron plate is bent to form the arc prevention frame 7i, and the repulsive force that attempts to return to the original is used. Therefore, a perspective view of the arc prevention frame 7i shown in FIG. 18B is a side sectional view of the arc prevention frame 7i shown in FIG.

  As shown in FIG. 18B, the arc prevention frame 7i of the present embodiment has a structure in which a thin metal wire 20 of lead or the like is used to suppress the repulsive force of the arc prevention frame 7i that is bent to return to its original state. is doing. During the normal operation of the switch gear 100, outside air can be taken in and the inside of the housing 1 can be cooled, as in the first embodiment and the like. At the time of a short circuit, the arc preventing frame 7i moves toward the perforated frame 9a due to high temperature and high pressure arc, and at the same time, the thin metal wire 20 is melted and cut by heat, and a repulsive force against bending of the arc preventing frame 7i is added. The ventilation hole 11 can be closed at high speed.

  In the present embodiment, the repulsive force against bending of the metal can be used as compared with the first embodiment and the like, so that the ventilation hole 11 can be closed at a very high speed, and the ejection of the arc to the outside can be further reduced. You can The size and material of the metal fine wire 20 used in the present embodiment are not particularly limited, and the same effect can be obtained as long as the metal fine wire 20 is cut by the heat of the arc generated during a short circuit.

Fifteenth Embodiment
The present embodiment is similar to the first embodiment and the like in that the perforated frame 9a and the arc prevention frame 7a are installed in the ventilation duct 5, but the structure of the perforated frame 9a is different. The perforated frame 9a used in the first embodiment and the like has a structure in which the ventilation hole 11 is simply formed in the metal plate. However, as shown in the side sectional view of FIG. 19, the perforated frame 9d used in the present embodiment has a protrusion 21 on the side of the arc prevention frame 7a around the ventilation hole 11 that faces the flapper 10a. It is characterized by the fact that

  When the switch gear 100 operates normally, the outside air can be taken into the inside of the housing 1 to cool the inside of the housing 1. When an internal arc occurs due to a short circuit, the internal pressure rapidly causes the arc prevention frame. The point that 7a blocks the ventilation hole 11 is the same as in the first embodiment and the like. In the present embodiment, the projection 21 is crushed at the moment when the flapper 10a closes the ventilation hole 11, and the slight gap between the flapper 10a and the ventilation hole 11 can be closed. This makes it possible to further prevent the arc from being emitted to the outside.

Sixteenth Embodiment
The present embodiment is similar to the first embodiment and the like in that a perforated frame 9a and an arc prevention frame 7a are installed in the ventilation duct 5. The perforated frame 9a used in the first embodiment and the like has a structure in which the ventilation hole 11 is simply formed in the metal plate. However, as shown in the perspective view of FIG. 20, the perforated frame 9e used in the present embodiment is characterized in that the dust removal filter 22 (hatched portion in FIG. 20) is attached inside the ventilation hole 11. Have.

  When the switch gear 100 operates normally, outside air can be taken into the housing 1 to cool the inside of the device, and at the same time, dust in the outside air that has entered the ventilation duct 5 is provided in the ventilation hole 11 as a dust removal filter. You can remove it at 22. By preventing dust from entering through the ventilation hole 11, when the arc prevention frame 7a closes the ventilation hole 11 at the time of a short circuit, dust or the like does not get caught in the mutual contact portion, and the gap from the dust to the outside of the arc is prevented. Never released.

  In the present embodiment, the dust removing filter 22 is formed in the ventilation hole 11 as means for removing dust from the outside air, but the method is not limited to this method, and for example, as shown in FIG. 21, the perforated frame 9f. The same effect can be obtained by forming the adsorption filter 23 (hatched portion in FIG. 21) in a portion other than the ventilation hole 11 and removing dust contained in the outside air.

Seventeenth Embodiment
In this embodiment, the basic form is the same as that of the first embodiment, and the operation of closing the ventilation hole 11 of the perforated frame 9a with the arc prevention frame 7a when the switch gear 100 is short-circuited is also performed. Same as 1. In this embodiment, as shown in a perspective view of the arc prevention frame 7j in FIG. 22A and a side sectional view of the arc prevention frame 7j in FIG. 22B, the ventilation hole 11 of the perforated frame 9a is shown. It is characterized in that a packing material 24 made of a resin material is formed on the surface of the flapper 10i of the arc preventing frame 7j to be closed, and the ventilation hole 11 is closed via the packing material 24.

  By using the packing material 24, when the switch gear 100 is short-circuited and an arc occurs, when the flapper 10i of the arc prevention frame 7j closes the ventilation hole 11 of the perforated frame 9a, the packing material 24 prevents the arc. The leak can be completely closed. Therefore, it is possible to prevent the arc from being emitted to the outside of the switch gear 100.

  In the present embodiment, acrylic resin is applied and cured on the surface of the flapper 10i of the arc prevention frame 7j and used as the packing material 24, but the present invention is not limited to this. Any material can be used as long as it has a Young's modulus lower than that of the material forming the flapper 10i and prevents arc leakage when the arc prevention frame 7j is pressed against the perforated frame 9a by the arc. For example, when the arc preventing frame 7a is formed of an iron plate (Young's modulus: 200 GPa), a metal layer having a Young's modulus lower than that of the iron plate, such as phosphor bronze (Young's modulus), is used on the surface of the flapper 10a instead of the acrylic resin. The same effect can be obtained by using solder (Young's modulus: about 20 GPa) or the like.

Eighteenth Embodiment
FIG. 23 shows a cross-sectional view of the vicinity including the ventilation duct 5 of the present embodiment. FIG. 23 (a) shows a state in which the switch gear 100 is operating normally, in which a heat-melting window 25 made of lead, which is melted by heat, is formed in a part of the ventilation duct 5 and is formed thereon. A metal ingot 26 made of a cubic metal is arranged. In this state, the outside air is taken into the housing 1 to cool the apparatus.

  FIG. 23B shows a state in which a short circuit occurs and the arc is cut off so that the arc is not emitted to the outside. When an arc is generated, the heat melting window 25 is melted by the high temperature arc, and the metal lump 26 falls into the ventilation duct 5 and interrupts the flow of the arc. As a result, it is possible to prevent the arc generated during a short circuit from being emitted to the outside.

  In the present embodiment, the metal lump 26 is arranged on the ventilation duct 5 and is configured to drop into the ventilation duct 5 when an arc is generated. However, instead of the metal lump 26, it is resistant to heat like sand or metal powder. The same effect can be obtained by disposing a granular material on the ventilation duct 5 and filling the ventilation duct with a granular material such as sand or metal particles by melting the thermal melting window 25 when an arc occurs. .

Nineteenth Embodiment
FIG. 24 shows a cross-sectional view of the vicinity including the ventilation duct 5 of the present embodiment. FIG. 24 (a) shows a state in which the switch gear 100 is operating normally, and a hole (through hole 27) penetrating vertically is formed in a part of the ventilation duct 5, and FIG. A slit plate 29, which is a plate material in which a vent hole 28 is formed, is arranged in a part shown in the front view in FIG. The ventilation duct 5 and the slit plate 29 are partially fixed by solder 30.

  FIG. 24B shows a state in which a short circuit occurs and the arc is cut off so that the arc is not emitted to the outside. When an arc occurs, the solder 30 that fixes the slit plate 29 melts due to the high temperature arc, and the slit plate 29 falls to close the ventilation duct 5 and shut off the arc flow. As a result, the arc generated at the time of short circuit can be blocked from the outside of the switch gear 100, and the arc can be maintained so as not to be discharged to the outside.

Embodiment 20.
In the present embodiment, the perforated frame 9a and the arc prevention frame 7a shown in the first embodiment are not used side by side, but the frame 31 with flapper shown in FIG. 25 is used. The flapper-equipped frame 31 has a flapper 35 formed in each of one or a plurality of ventilation holes 32 formed in the frame, and a part of the flapper 35 is connected to the frame. A ventilation hole 32 is formed by bending a portion (connection portion) 33 connected to the frame. It is possible to adjust the strength at the time of bending by forming a slit 34 (not shown because it is located on the back of the connecting portion 33) in the bent portion of the connecting portion 33 or by thinly processing the plate material of the bent portion.

  A hole is formed in the bent flapper 35 by tapping or burring, and a washer 36 and a bolt 37 are attached so as to protrude from the flapper 35 as shown in FIG. The washer 36 and the bolt 37 can function as a stopper for the operation of the flapper 35 when a short circuit occurs and the bent portion of the connecting portion 33 of the flapper 35 is extended due to the pressure of the internal arc. Although both the washer 36 and the bolt 37 are used in the present embodiment, the same effect can be obtained by using either of them.

  By using the flapper-equipped frame 31 shown in FIG. 25 in the ventilation duct 5, outside air can be taken in during normal operation of the switch gear 100 to cool the inside of the housing 1, and when an internal arc occurs due to a short circuit. , The flapper 34 of the frame 31 with the flapper is closed at high speed by the internal pressure, and the washer 37 fixed by the bolt 36 is used as a stopper to close the gap, so that the arc can be prevented from being emitted to the outside.

    100 switchgear, 1 housing, 2a upper circuit breaker room, 2b lower circuit breaker room, 3a upper cable room, 3b lower cable room, 4a upper main bus room, 4b lower main bus room, 5 ventilation ducts, 6 ventilation tubes, 7a to 7j Arc prevention frame, 8 slits, 9a to 9f Perforated frame, 10a to 10h flapper, 11 Ventilation hole, 12 White arrow, 13 Black arrow, 14 Blocking material, 15 Thin wall part, 16 Another metal part, 17 V-shaped stopper, 18 gap, 19 rivet, 20 metal fine wire, 21 protruding part, 22 dust filter, 23 adsorption filter, 24 packing material, 25 heat melting window, 26 metal block, 27 through hole, 28 vent hole, 29 slit Board, 30 solder, 31 frame with flapper, 32 ventilation hole, 33 connection part, 34 slit, 35 Wrapper, 36 washers, 37 volts.

Claims (16)

A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
Folding the shaped Ku the plate, Ri flapper and the other flat portion der which is one of flat portions connected to the bent portion, rather than on the perforated frame to be the ventilation holes on the same plane, the ventilation duct A switchgear having a fixing portion for fixing to an inner surface of the arc duct, and an arc prevention frame in which the bent portion is arranged adjacent to the inner side of the perforated frame inside the ventilation duct. The switchgear according to claim 1, wherein the bent portion of the arc prevention frame is extended by the pressure generated by the arc generation at the time of short circuit, and the ventilation hole of the perforated frame is closed. The switchgear according to claim 1 or 2, wherein a slit for reducing bending strength is provided in the bent portion. The switchgear according to claim 1 or 2, wherein a thin portion for reducing bending strength is provided in the bent portion. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
The folding reduces the bending strength in the portion, body portion, wherein the to Luz Itchigiya for using a different metal portions. The switchgear according to any one of claims 1 to 5, wherein a plurality of combinations of the perforated frame and the arc prevention frame are arranged in the ventilation duct. 7. When arranging a plurality of combinations of the perforated frame and the arc prevention frame in the ventilation duct, at least one set is installed on an upper surface in the ventilation duct. Switch gear. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
A plurality of combinations of the perforated frame and the arc prevention frame are arranged in the ventilation duct,
When arranging a plurality of combinations of the perforated frame and the arc prevention frame in the ventilation duct, the position of the ventilation hole in the perforated frame, at least one is a position eccentric in the vertical direction. features and to Luz Itchigiya that it is formed in. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
Wherein the back side of the interior of the arc prevention frame ventilation ducts, features and be away Itchigiya further comprising a shielding member for shielding the flow of air. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
By arc pressure during a short circuit of the arc prevention frame formed by bending a plate material in a portion close the ventilation holes, further bending characteristics and be away Itchigiya that form part. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
It said bore of said ventilation holes perforated frame forming a plurality of the ventilation holes on the characteristics and to Luz Itchigiya that is the arc prevention frame corresponding are divided into a plurality. The arc prevention frame inside the ventilation duct operates laterally when closing the ventilation hole by the arc pressure at the time of a short circuit. 12. The arc prevention frame according to any one of claims 1 to 11, wherein: Switch gear. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
Features and to Luz Itchigiya that the formation of the protruding portions around the ventilation holes formed in the perforated frame. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a fixing portion to the ventilation duct that is the other flat portion, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
Wherein the surface of the arc-preventing frame, features and be away Itchigiya that the formation of the resin layer. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a flat portion that is the other flat portion and is fixed to the ventilation duct, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
Wherein the surface of said flapper arc prevention frame, features and be away Itchigiya that the formation of the metal layer Young's modulus is lower than the arc-preventing frame. A housing for partitioning and storing a circuit breaker room, a cable room, and a main bus room,
A ventilation duct that connects the inside and the outside of the housing,
A perforated frame having a ventilation hole that is arranged inside the ventilation duct and is a passage for air,
The plate material is bent in a dogleg shape, and has a flapper that is one flat portion connected to the bent portion and a flat portion that is the other flat portion and is fixed to the ventilation duct, and the perforated frame inside the ventilation duct. And an arc prevention frame in which the bent portions are arranged adjacent to each other,
Wherein the surface of said flapper arc prevention frame, features and be away Itchigiya that it has formed a stopper for venting holes and fitting of the perforated frame.

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