JPWO2018138805A1 - Switch gear - Google Patents

Abstract

The switch gear 100 according to the present invention includes a case 1 for partitioning and storing the circuit breaker chamber 2, the cable chamber 3, and the main bus line chamber 4, a ventilation duct 5 for communicating the inside and the outside of the housing 1, and the ventilation duct 5. And a perforated frame 9 having a ventilating hole 11 formed therein, which is an air passage, and a flat plate formed by bending a plate into a V-shape, the flapper 7 being one flat portion connected to the bent portion and the other flat portion It has a fixing portion to a ventilation duct 5 and is characterized by comprising an arc preventing frame 7 disposed on the back side of the perforated frame 9 inside the ventilation duct 5 with a bent portion adjacent thereto.

Description

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

  In a conventional switchgear, a circuit breaker room, a cable room, and a main bus room are defined in upper and lower portions in a housing, separated from each other, and a ventilation intake duct extending in the front and rear direction in the housing for cooling And a branch duct which is separated from the ventilation intake duct and extends in the vertical direction in the housing. Inside the ventilation intake duct and the branch duct, a plurality of flappers (vents) are provided to open and close the flow of air in the duct.

  The flapper of the conventional structure for opening and closing the duct has a configuration in which two plates are connected by a hinge. When the switchgear is in normal operation, the flapper takes outside air from the ventilation intake duct without blocking the duct, cools the inside of the switchgear housing, and is exhausted to the outside through the branch duct. Ru. When a short circuit occurs and an arc occurs, the internal pressure is rapidly increased, and the flapper is pressed to close the duct to prevent the arc from being discharged out of the apparatus.

JP 2000-228803 A

  This flapper uses hinges to join two plates, resulting in a large number of parts and high cost. In addition, it is necessary to finely adjust the installation angle and angle change due to stress, etc. so that the operation to close the duct can be stably performed by the pressure rise inside the housing due to the occurrence of arc at the time of short circuit. It takes time and there is a problem that work efficiency is bad.

  The present invention has been made to solve such problems, and includes a case that divides and houses a circuit breaker room, a cable room, and a main bus room, and a ventilation duct that communicates the inside and the outside of the case; A perforated frame which is disposed inside a ventilation duct and has a ventilation hole which is an air passage, and a flat plate which is bent into a V shape and which is a flat portion connected to a bent portion and a flat portion of the other. And a fixing portion to the ventilation duct, and an arc preventing frame disposed with the bent portion adjacent to the back side of the perforated frame inside the ventilation duct.

  According to the present invention, since it is not necessary to use a hinge for the flapper, the number of parts is small and the cost is low, and a fine adjustment is unnecessary, so that a switch gear having high working efficiency can be obtained.

It is side surface sectional drawing which shows the internal structure of the switchgear which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the flame | frame for arc prevention 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. It is sectional drawing which shows the structure in the ventilation duct at the time of the normal operation concerning Embodiment 1 of this 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) Normal operation, (b) Internal arc generated. It is a perspective view which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 8 of this invention. It is a perspective view which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 9 of this invention. It is a perspective view which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 10 of this invention. It is a figure which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 11 of this invention. (A) Perspective view, (b) Side cross-sectional view. It is a figure which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 12 of this invention. (A) Perspective view, (b) Side cross-sectional view. It is a figure which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 13 of this invention. (A) Perspective view, (b) Side cross-sectional view, (c) Perspective view showing an operating state. It is a figure which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 14 of this invention. (A) Perspective view, (b) Side cross-sectional view. It is side surface sectional drawing which shows the structure of the perforated frame which concerns on Embodiment 15 of this 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. FIG. 21 is a view showing the structure of an arc preventing frame according to a seventeenth embodiment of the present invention. (A) Perspective view, (b) Side cross-sectional view. It is sectional drawing which shows the ventilation duct periphery which concerns on Embodiment 18 of this invention. (A) Normal operation, (b) Internal arc generated. It is a figure which shows the structure of the ventilation duct periphery and slit plate which concern on Embodiment 19 of this invention. (A) Normal operation, (b) Internal arc generation, (c) Front view of slit plate. It is a perspective view which shows the structure of the flame | frame for arc prevention which concerns on Embodiment 20 of this invention.

  In the description of the embodiment and the drawings, the 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 switch gear 100 according to the first embodiment. The switch gear 100 has an upper breaker chamber 2a, a lower breaker chamber 2b, an upper cable chamber 3a, a lower cable chamber 3b, an upper main bus room 4a, a lower main bus room 4b, etc. The chambers are spaced apart. The ventilation duct 5 is provided in the lower part of the lower lower-stage circuit breaker room 2b which is divided, and in general, the air is taken in from the outside through the ventilation duct 5 to cool the inside of the housing 1 and provided in the upper part of the housing 1 Exhaust air from the ventilation tube 6.

  2 and 3 show an arc preventing frame 7a and a perforated frame 9a attached to the inside of the ventilation duct 5, respectively. The frame 7a for arc prevention shown in FIG. 2 has a structure in which a plate material is bent, and the flapper 10a having a function as a shutter for opening and closing the ventilation duct 5 as one flat portion connected to the bent portion will be described later. The other flat portion is a fixing portion for fixing to the inside of the ventilation duct 5. A slit (cut) 8 is formed in the bent portion, and the bent portion is configured to be easily deformed as compared with the 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 preventing frame 7a and the perforated frame 9a are both processed and formed using an iron plate as a plate material, but the present invention is not limited to the iron plate, and generally used metals such as copper and aluminum. A board can be used. Further, the size, bending angle, and the like of the slits 8 of the arc prevention frame 7a are not particularly limited, and can be determined in consideration of the operation, processability, and the like of the arc prevention frame 7a described later. Furthermore, 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, processability, and the like of the flapper 10a described later.

  FIG. 4 is a cross-sectional view of the ventilation duct 5 to which the arc preventing frame 7a and the perforated frame 9a are attached, and shows a state in which the switch gear 100 is performing a normal operation. In the drawing, the left side shows the outside of the case 1 of the switch gear 100, and the right side shows the inside (rear side) of the case 1. In the ventilation duct 5, the perforated frame 9a is disposed outside and the arc preventing frame 7a is disposed on the back side, and the arc preventing frame 7a has its bent portion adjacent to the perforated frame 9a, that is, a bent portion Is placed outward. In addition, the white arrow 12 shown in FIG. 4 has shown the flow of air when the air for cooling was taken in from the exterior.

  Generally, since the temperature of the inside of the housing 1 of the switch gear 100 rises, outside air is taken in from the ventilation duct 5 due to the temperature difference, and the inside of the housing 1 is cooled and exhausted from the ventilation cylinder 6 provided in the upper part Ru. A fan (not shown) may be attached near the arc prevention frame 7a and the perforated frame 9a in order to actively introduce the outside air into the housing 1. By using the fan, the inside of the ventilation duct 5 can take in outside air more efficiently.

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

  When the arc preventing frame 7a is extended by the arc and pressed against the perforated frame 9a, the ventilation holes 11 of the perforated frame 9a are closed by the flapper 10a of the arc preventing frame 7a, and the arc further extends the ventilation duct 5 There is no possibility of backflow, and no spouting to the outside of the housing 1. As described above, when the short circuit occurs, the bent portion of the arc prevention frame 7a is extended, and the flaps 10a close the ventilation duct 5 to prevent the arc from being ejected to the outside of the switch gear 100.

  Conventionally, the arc prevention frame 7a forms a bendable portion using a hinge or the like, and the hinge portion is extended by the occurrence of an arc due to a short circuit. However, in the present embodiment, since the slit 8 is formed in the bent portion to form the arc preventing frame 7a, the adjustment is easy and the hinge is not used, so the number of parts is small and the cost is 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 it is possible to use one, two, or three or more. Can. However, when the size of the ventilating hole 11 per one is large, foreign matter may be taken in simultaneously with ventilation, which may cause failure of the device. In addition, when the ventilating hole 11 per one is small, the ventilating hole 11 may be blocked by the foreign material taken in at the same time as the ventilation, and the ventilation may not be performed smoothly. Therefore, it can be said that about two to five ventilation holes 11 are preferable.

Second Embodiment
In the present embodiment, the basic configuration of the switch gear 100 is the same as that of the first embodiment, and the upper breaker chamber 2a, the lower breaker chamber 2b, and the upper cable chamber 3a which are partitioned in the housing 1 A lower cable room 3b, an upper main bus room 4a, a lower main bus room 4b and the like are provided, and the respective rooms are spaced apart from each other. The ventilation duct 5 is provided in the lower part of the lower lower-stage circuit breaker room 2b which is divided, and normally it sucks in to the ventilation duct 5 from the outside, cools the inside of the housing 1, and the ventilation provided in the upper part of the housing 1 Exhaust from the cylinder 6.

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

  FIG. 6 shows a state in which the switch gear 100 is operating normally and taking in the outside air from the ventilation duct 5 in order to cool the inside of the housing 1. If a short circuit occurs and an internal arc occurs, the internal pressure will be high. At this time, the bent portion of the arc preventing frame 7a is extended, and the ventilation holes 11 of the perforated frame 9a are closed with the flapper 10a to prevent the discharge of the arc to the outside as in the first embodiment.

  In the present embodiment, two sets of the arc preventing frame 7 a and the perforated frame 9 a are disposed in the ventilation duct 5. Therefore, foreign matter etc. may enter and interfere with the movement of the flapper 10a, and the bent portion of the first frame for preventing arc 7a can not be extended at the time of arcing, and the ventilation hole 11 of the perforated frame 9a is closed. Even if it is not possible, another set of arc preventing frames 7a can be operated to close the ventilation holes 11. Therefore, as in the first embodiment, in addition to the feature that adjustment is easy and cost reduction is possible, the certainty of operation can be enhanced and the effect of arc prevention can be enhanced.

Third Embodiment
In the present embodiment, the basic structure is the same as that of the second embodiment. In the second embodiment, two sets of the arc preventing frame 7a and the perforated frame 9a are disposed on the same side of the ventilation duct 5, and the outside air taken in during the normal operation is the arc preventing frame 7a. Are arranged to pass through the top of the flapper 10a. However, in the present embodiment, as shown in FIG. 7, the arc preventing frame 7a is different in that one of the ventilation ducts 5 is formed on the lower surface and the other on the upper surface.

  During normal operation, the taken-in air passes through the upper portion of the flapper 10 a of one of the arc preventing frames 7 a and passes through the lower portion of the other flapper 10. Therefore, as indicated by a broken line in the drawing, the taken-in external 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 an arc preventing frame 7a and a perforated frame 9b are arranged upside down in the ventilation duct 5, respectively. In the third embodiment, the ventilation holes 11 formed in the perforated frame 9a are formed substantially at the center of the perforated frame 9a, but in the present embodiment, the ventilation holes 11 are formed at the central portion of the perforated frame 9b. However, they are different in that they are formed in an eccentric part in one direction.

  As shown in FIG. 8 in the cross-sectional view of the ventilation duct 5 of the present embodiment, two sets of arc preventing frames 7 a and a perforated frame 9 b are disposed inside the ventilation duct 5. In the perforated frame 9b paired with the arc preventing frame 7a disposed on the lower surface of the ventilation duct 5, the ventilation holes 11 are formed in a lower portion than the center of the perforated frame 9b, and the arc preventing frame disposed on the upper surface In the perforated frame 9b paired with 7a, the ventilation holes 11 are formed in the upper part than 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 FIG. Since the outside air taken in to cool the inside of the housing 1 flows in a large meandering manner, it has a feature that the vicinity of the ventilation duct 5 can be cooled more efficiently.

Embodiment 5
In the present embodiment, the basic structure is the same as that of the first embodiment, and a ventilation duct 5 is provided with a pair of arc preventing frames 7a and a perforated frame 9a. In the present embodiment, as shown in the cross-sectional view of the ventilation duct 5 of the present embodiment of FIG. 9, the rectangular box-shaped shielding member 14 is provided on the back side of the apparatus 7a for preventing arc.

  When switch gear 100 is operating normally, outside air for cooling the inside of housing 1 is taken in from the left side of the figure, and when a short circuit occurs, an arc is generated and the direction indicated by black arrow 13 in FIG. The pressure of the internal arc is applied to the The pressure extends the bent portion of the arc preventing frame 7a to block the perforated frame 9a and prevent the arc from being discharged outside (in FIG. 9, the flapper 10a does not block the ventilation holes 11 of the perforated frame 9a) Show the situation).

  As described in the first embodiment, when an arc is generated inside the apparatus, the pressure is applied in the direction toward the outside to press the flapper 10a of the arc preventing frame 7a, and the ventilation holes 11 of the perforated frame 9a. Block the In the present embodiment, since the shielding member 14 is provided adjacent to the arc prevention frame 7a, the area in which the arc flows is narrowed, and the speed of the arc is increased. Along with this, the pressure of the arc pushing the flapper 10a also increases, and the flapper 10a of the arc preventing frame 7a can close the ventilation holes 11 of the perforated frame 9 at high speed, thereby more accurately preventing the arc from discharging outside. It has the feature of being able to

Sixth Embodiment
In the present 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 7b and a perforated frame 9a. In the present embodiment, as shown in the cross-sectional view of the ventilation duct 5 according to the present embodiment of FIG. 10, in the first embodiment etc., the bent portion of the arc preventing frame 7a is single. In addition to the one bent part, it has one further bent part.

  Therefore, in the present embodiment, the bending angle is large at the upper part of the arc prevention frame 7b and is small at the lower part. Therefore, in the present embodiment, during the normal operation of the switch gear 100, the flow of the outside air taken in for cooling is taken into the inside of the housing 1 without being blocked 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 preventing frame 7b is susceptible to the pressure of the arc generated from the inside, so it is pressed against the perforated frame 9a at high speed, and the ventilation hole 11 can be closed at high speed.

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

Seventh Embodiment
In the present 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 a perforated frame 9a. The present embodiment is different in that the arc preventing frame 7a is provided at a predetermined distance from the perforated frame 9a. Cross-sectional views of the ventilation duct 5 of the present embodiment are shown in FIGS. 11 (a) shows a state in which the switch gear 100 is in normal operation, and FIG. 11 (b) shows a state in which the ventilation holes 11 of the perforated frame 9a are blocked by the flapper 10a under the pressure of the arc due to short circuiting. The arrow in the figure indicates the portion where the arc preventing frame 7a and the perforated frame 9a are disposed at a constant distance.

  As shown in FIG. 11A, when the switch gear 100 is in normal operation, the arc preventing frame 7a has the same structure as that of the first embodiment and the like in that it does not prevent the flow of the outside air. As shown in FIG. 11 (b), when the arc preventing frame 7a blocks the ventilation hole 11 due to the arc generated by the short circuit, a certain distance is taken rather than in close contact with the perforated frame 9a and the arc preventing frame 7a. In the case of having it, the flapper 10a is pushed more strongly to the ventilation hole 11, and it is possible to more completely block the discharge of the arc to the outside.

Eighth Embodiment
In the present embodiment, as in the first embodiment, the point of installing the perforated frame 9a inside the ventilation duct 5 is the same. However, one arc preventing frame 7c disposed adjacent to the perforated frame 9a is a flapper 10c having a longitudinal notch as shown in FIG. 12, and the ventilation hole 11 of the perforated frame 9a It differs in that it has a structure divided into three in the vertical direction correspondingly.

  When the flapper 10c having the notches in the longitudinal direction is used, since there is a gap in the flapper 10c portion, the external air taken in during the normal operation of the switch gear 100 is not disturbed, and the efficiency of internal cooling of the housing 1 is high. On the other hand, when a short circuit occurs, the same effect can be obtained as to the point of closing the ventilation holes 11 of the perforated frame 9a as compared with the flapper 10a which is not divided in the first embodiment and the like. In addition, the number to divide of the flapper 10c which has a longitudinal direction notch is not specifically limited, It is important to correspond with the number of the ventilation holes 11 of the perforated frame 9a.

Embodiment 9
In the eighth embodiment, the flapper 10c installed adjacent to the perforated frame 9a inside the ventilation duct 5 has a notch in the longitudinal direction, and 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 preventing frame 7d including the bent portion and the fixing portion is divided as shown in FIG. It is different.

  The arc prevention frame 7d used in the present embodiment is a set of three, and corresponds to the number of ventilation holes 11 formed in the perforated frame 9a. When the switch gear 100 is in normal operation, since there is a gap between the flappers 10d, the internal cooling efficiency can be increased without disturbing the captured outside air. At the time of 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 10 a of the first embodiment etc. can be obtained. In addition, although the flame | frame 7d for arcing divided | segmented is comprised by three, it is not limited to this, It is important to correspond with the number of the 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 preventing frame 7a operates in the longitudinal direction by the pressure of the internal arc, The difference is that an arc preventing frame 7e is used which operates sideways as shown in FIG. 14 instead of closing the ventilation holes 11.

  Thus, by using the horizontal arc preventing frame 7e, the ventilating duct 5 is bent and the arc preventing frame 7e can be attached even when it is difficult to attach the arc preventing frame 7a to the lower surface of the ventilating duct 5. In normal operation, the inside of the housing 1 of the switch gear 100 is cooled by taking in the outside air, and in the case of a short circuit, the ventilation holes 11 of the perforated frame 9c can be closed by the flapper 10e in the horizontal direction by the pressure of the arc. Can be prevented.

  In the present embodiment, the horizontally oriented arc preventing frame 7e is used in a state where the flapper 10e is not divided but integrated. However, the flapper operating in the vertical direction shown in the eighth embodiment and the ninth embodiment As exemplified in 10c and 10d, even the flapper 10f divided into a plurality corresponding to the position of the ventilation hole 11 can be used, and the same effect can be obtained.

Embodiment 11
In the present embodiment, the basic form is the same as that of the first embodiment, and only the structure of the bent portion of the arc preventing frame 7f is different from that of the first embodiment. In the first embodiment, the slit 8 is formed, which is easier to bend than the other portions of the arc prevention frame 7a, and the angle is easily changed after being bent, but in the present embodiment, the plate thickness of the bent portion Is thinner than the other portions (the thin portion 15 is provided).

  FIG. 15 shows an arc preventing frame 7f used in the present embodiment. FIG. 15 (a) is a perspective view of the arc preventing frame 7f, and FIG. 15 (b) is a side sectional view. An inner surface of a bent portion of the arc preventing frame 7f is thinly removed to form a thin portion 15. As a result, the bending process of the arc preventing frame 7f becomes easy, and the bent portion can be easily elongated by the pressure of the arc at the time of the short circuit, and the ventilation holes 11 can be reliably closed to prevent the arc from being discharged.

Embodiment 12
In the present embodiment, the basic form is the same as that of the first embodiment, and only the structure of the bent portion of the arc preventing frame 7g is different from that of the first embodiment. In the first embodiment, the slit 8 is formed, which is easier to bend than the other portions of the plate material, and after being bent, the angle of the flapper 10a is easily changed. 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 preventing frame 7g used in the present embodiment. FIG. 16 (a) is a perspective view of the arc preventing frame 7g, and FIG. 16 (b) is a side sectional view. It can be seen that the metal portion 16 other than the main body portion is connected to the bent portion of the arc prevention frame 7g. Specifically, although an iron plate subjected to surface treatment for anticorrosion is used as the arc preventing frame 7g, an aluminum plate is used at a bent portion, and they are connected using an adhesive.

  The material used for the arc preventing frame 7g used in the present embodiment, the material used for the bent portion, etc. are not particularly limited, but the entire arc preventing frame 7g improves the processability of the bent portion to generate the internal arc. It is preferable to use a material that can be bent more easily than the material used for the main part of the frame 7g for preventing arc, considering that the pressure of the arc makes the bent part easy to stretch sometimes.

  By using an arc prevention frame 7g using a more easily bendable metal plate in the bent portion, the pressure can be easily extended by the pressure of the arc at the time of short circuit, and the ventilating hole of the perforated frame 9a by the pressure of the arc at the time of arc generation. 11 can be reliably closed, and the discharge of arc exhaust from switch gear 100 can be prevented.

Thirteenth Embodiment
The present embodiment is the same as the first embodiment and the like in that the perforated frame 9a shown in FIG. 3 is disposed in the ventilation duct 5, but an arc preventing frame installed immediately after the perforated frame 9a. The shape of 7h is different. In the present embodiment, the flap prevention flapper 10g shown in FIG. 17 is used for the arc prevention frame 7h. FIG. 17 (a) is a perspective view of an anti-arcing frame 7h with bounce prevention, and FIG. 17 (b) is a side sectional view. In the anti-splashing arc preventing frame 7h, the V-shaped stopper 17 is attached to the ordinary arc preventing frame 7a with a rivet 19 and as shown in FIG. 17 (b), the tip portion of the V-shaped stopper 17 A fixed gap 18 is provided between the and the flapper 10g.

  At the time of normal operation of switch gear 100, outside air is taken in to cool the inside of housing 1 as in the first embodiment and the like. When a short circuit occurs, the internal pressure increases due to the occurrence of an arc, and the bent portion of the anti-splashing arc preventing frame 7h shown in FIGS. 17 (a) and 17 (b) is extended to extend the ventilation holes 11 of the perforated frame 9a. This embodiment is the same as the first embodiment and the like in that it is closed and the arc is prevented from spouting to the outside.

  If an arc occurs due to a short circuit, the arc prevention frames 7h block the ventilation holes 11 very quickly, so they may hit each other, bounce back, and it may take a while to close again due to internal pressure, It is possible that the arc leaks. However, in the present embodiment, as shown in FIG. 17 (c), at the moment when the bounce-prevented arc preventing frame 7h blocks the ventilating hole 11 of the perforated frame 9a, Since the stopper 17 engages and prevents bounce, it is possible to prevent the discharge of the arc to the outside.

  In the present embodiment, the combination of the V-shaped stopper 17 and the ventilation holes 11 of the perforated frame 9a is used to prevent the flapping of the flapper 10g, but the present invention is not limited to this. Other shapes may be used as long as they constrain the operation.

Fourteenth Embodiment
The basic configuration of the present embodiment is the same as that of the first embodiment and the like, but differs in that the repulsive force when the metal plate is bent is used for the operation of the flapper 10 h. In this embodiment, an iron plate is bent to form an arc preventing frame 7i, and the repulsive force to return to the original state is used, and a perspective view of the arc preventing frame 7i shown in FIG. Fig. 18 shows a side sectional view of the arc preventing frame 7i shown in Fig. 18 (b).

  As shown in FIG. 18B, the arc preventing frame 7i of the present embodiment has a structure in which the thin metal wires 20 such as lead are bent to suppress the repulsive force of the arc preventing frame 7i from returning to the original state. doing. At the time of normal operation of switch gear 100, outside air can be taken in to cool the inside of housing 1 as in the first embodiment and the like. At the same time as the short circuit, the arc prevention frame 7i is moved toward the perforated frame 9a by the high temperature and high pressure arc, and at the same time, the metal thin wire 20 is melted and cut by heat, and the repulsion force against the bending of the arc prevention frame 7i is also added. The ventilation holes 11 can be closed at high speed.

  In the present embodiment, since the repulsive force against bending of metal can also be used as compared with the first embodiment etc., the ventilation hole 11 can be closed at a very high speed, and the ejection of the arc to the outside is further reduced. Can. The size and the 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 at the time of the short circuit.

Embodiment 15
The present embodiment is the same as the first embodiment and the like in that the perforated frame 9a and the arc preventing 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 holes 11 are simply formed in the metal plate. However, the perforated frame 9d used in the present embodiment has the projecting portion 21 on the side of the arc preventing frame 7a around the ventilation hole 11 facing the flapper 10a, as shown in the side sectional view in FIG. It has a feature in that it is doing.

  When the switch gear 100 performs a normal operation, the outside air can be taken into the inside of the housing 1 to cool the inside of the housing 1, and when an internal arc is generated due to a short circuit, the frame for arc prevention at high speed by the internal pressure. The point 7a blocks the ventilation hole 11 is the same as that of the first embodiment and the like. In the present embodiment, at the moment when the flapper 10 a blocks the ventilation hole 11, the protrusion 21 is crushed, and a slight gap between the flapper 10 a and the ventilation hole 11 can also be closed. This can further prevent the discharge of the arc to the outside.

Sixteenth Embodiment
The present embodiment is the same as the embodiment 1 and the like in that the perforated frame 9 a and the arc preventing frame 7 a 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 holes 11 are simply formed in the metal plate. However, as shown in a perspective view in 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 performs a normal operation, the outside air can be taken into the inside of the housing 1 to cool the inside of the apparatus, and at the same time, the dust in the outside air that has entered the ventilation duct 5 is provided in the ventilation hole 11 You can get rid of it at 22. By not putting dust in through the ventilation hole 11, when the arc preventing frame 7a closes the ventilation hole 11 at the time of short circuit, dust etc. will not get caught in the mutual contact parts, and the clearance from the dust to the outside of the arc There is no release.

  In the present embodiment, the dust removal filter 22 is formed in the ventilation holes 11 as a means for removing dust from the outside air, but the method is not limited to this method. For example, as shown in FIG. The adsorption filter 23 (hatched portion in FIG. 21) is formed in a portion other than the ventilation hole 11 of the above, and the same effect can be obtained even if dust contained in the outside air is removed.

Embodiment 17
In the present embodiment, the basic form is the same as in Embodiment 1, and the operation of closing ventilation hole 11 of perforated frame 9a with arc preventing frame 7a when switch gear 100 is shorted is also an embodiment. Same as 1. In this embodiment, as shown in a perspective view of the arc preventing frame 7j in FIG. 22 (a) and a side sectional view of the arc preventing frame 7j in FIG. 22 (b), the ventilation holes 11 of the perforated frame 9a are A packing material 24 made of a resin material is formed on the surface of the flap 7i of the arc preventing frame 7j to be closed, and the ventilation hole 11 is closed via the packing material 24.

  When the switch gear 100 causes a short circuit by using the packing material 24 and an arc is generated, the packing material 24 is an arc when the ventilation holes 11 of the perforated frame 9a are closed with the flapper 10i of the arc prevention frame 7j. The leak can be completely closed. Therefore, the discharge of the arc to the outside of switch gear 100 can be prevented.

  In the present embodiment, an 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. However, the present invention is not limited to this. Any material may be used as long as it has a lower Young's modulus than the material constituting the flapper 10i and prevents arc leakage when the arc preventing frame 7j is pressed against the perforated frame 9a by the arc. For example, when the arc prevention 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 is used instead of the acrylic resin on the surface of the flapper 10a. The same effect can be obtained by using about 100 GPa) or solder (Young's modulus: about 20 GPa).

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

  FIG. 23 (b) shows a state in which a short circuit occurs and the arc is shut off so as not to emit an arc to the outside. When an arc is generated, the high temperature arc melts the thermal melting window 25 and the metal lumps 26 fall into the ventilation duct 5 to interrupt the flow of the arc. This can prevent the discharge of the arc generated at the time of the short circuit to the outside.

  In the present embodiment, the metal block 26 is disposed on the ventilation duct 5 and is configured to be dropped into the ventilation duct 5 at the time of arc generation, but instead of the metal block 26, it is resistant to heat as sand or metal powder. Similar effects can be obtained by disposing particulate matter on the ventilation duct 5 and filling the ventilation duct with particulate matter such as sand and metal particles by melting the thermal melting window 25 when arcing occurs. .

Embodiment 19: FIG.
A cross-sectional view of the vicinity including the ventilation duct 5 of the present embodiment is shown in FIG. FIG. 24 (a) shows a state in which the switch gear 100 is in normal operation, and a hole (through hole 27) penetrating the upper and lower portions is formed in a part of the ventilation duct 5, and FIG. A slit plate 29 which is a plate member in which the vent holes 28 are formed in a part of which a front view is shown in c) is disposed. The ventilation duct 5 and the slit plate 29 are partially fixed by the solder 30.

  FIG. 24 (b) shows a state in which a short circuit has occurred and the circuit is shut off so as not to emit an arc to the outside. When an arc is generated, the solder 30 fixing the slit plate 29 is melted by the high temperature arc, and the slit plate 29 is depressed to close the ventilation duct 5 to shut off the flow of the arc. Thereby, the arc generated at the time of short circuit can be interrupted from the outside of switch gear 100, and the arc can be maintained so as not to be emitted to the outside.

Embodiment 20
In this embodiment, the perforated frame 9a and the arc preventing frame 7a shown in the first embodiment are not used side by side, but a frame 31 with a flapper shown in FIG. 25 is used. The flapper frame 31 is formed by forming a flapper 35 in each of one or more ventilation holes 32 formed in the frame, and a part of the flapper 35 is connected to the frame. A portion (connection portion) 33 connected to the frame is bent to form a ventilation hole 32. The strength at the time of bending can be adjusted by forming a slit 34 (not shown because it is located behind the connection portion 33) in the bent portion of the connection portion 33, or thinning the plate material of the bent portion.

  Holes are formed in the bent flapper 35 by taps or burring, and washers 36 and bolts 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 by the pressure of the internal arc. Although both the washer 36 and the bolt 37 are used in this embodiment, the same effect can be obtained by using either of them.

  By using the frame 31 with the flapper 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 is generated due to a short circuit. Since the flapper 34 of the flapper frame 31 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, it is possible to prevent the arc from being emitted to the outside.

    100 switch gear, 1 case, 2a upper breaker room, 2b lower breaker room, 3a upper cable room, 3b lower cable room, 4a upper main bus room, 4b lower main bus room, 5 ventilation duct, 6 ventilation cylinder, 7a to 7j Arc prevention frame, 8 slits, 9a to 9f Perforated frame, 10a to 10h flapper, 11 ventilation holes, 12 white arrows, 13 black arrows, 14 blocking materials, 15 thin portions, 16 separate metal portions, 17 Shaped stopper, 18 gap, 19 rivet, 20 metal wire, 21 protrusion, 22 dust filter, 23 adsorption filter, 24 packing material, 25 heat melting window, 26 metal block, 27 through hole, 28 air hole, 29 slit Board, 30 solder, 31 frame with flapper, 32 ventilation holes, 33 connections, 34 slits, 35 Wrapper, 36 washers, 37 volts.

Claims (18)

An enclosure that divides and houses the circuit breaker room, the cable room, and the main bus room,
A ventilation duct that communicates the inside and the outside of the housing;
A perforated frame disposed inside the ventilation duct and having a ventilation hole which is an air passage;
The perforated frame has a plate member bent in a V-shape and has a flapper which is one flat portion connected to the bent portion and a fixing portion to the ventilation duct which is the other flat portion, and the perforated frame inside the ventilation duct A switchgear comprising: an arc preventing frame in which the bent portion is disposed adjacent to the far side of the frame. The switchgear according to claim 1, wherein the bent portion of the arc preventing frame is extended by a pressure due to an arc generation at the time of a short circuit to close the ventilation hole of the perforated frame. The switchgear according to claim 1 or 2, wherein the bent portion is provided with a slit for reducing bending strength. The switchgear according to claim 1 or 2, wherein the bent portion is provided with a thin portion which reduces bending strength. The switchgear according to claim 1 or 2, wherein the bent portion uses a metal portion different from the main body portion to reduce the bending strength. The switchgear according to any one of claims 1 to 5, wherein a plurality of combinations of the perforated frame and the arc preventing frame are disposed in the ventilation duct. 7. A plurality of combinations of the perforated frame and the arc preventing frame in the ventilation duct, wherein at least one set is installed on the upper surface in the ventilation duct. Switch gear. When arranging a plurality of combinations of the perforated frame and the arc preventing frame in the ventilation duct, at least one of the positions of the ventilation holes in the perforated frame is eccentric in the vertical direction. The switchgear according to claim 6 or 7, characterized in that   The switchgear according to any one of claims 1 to 8, further comprising a shielding member for shielding the flow of air on the back side of the arc prevention frame inside the ventilation duct. 10. A bent portion is further formed in a portion where the ventilation hole is closed by an arc pressure at the time of a short circuit of the arc preventing frame formed by bending a plate material, wherein a bent portion is further formed. Switch gear. A plurality of the ventilation holes are formed in the perforated frame, and the arc prevention frame is divided into a plurality corresponding to the ventilation holes, according to any one of claims 1 to 10. Switch gear described. 12. The arc prevention frame inside the ventilation duct operates in a lateral direction when closing the ventilation hole by an arc pressure at the time of a short circuit. Switch gear.
The switchgear according to any one of claims 1 to 12, wherein a protrusion is formed around the ventilation hole formed in the perforated frame. The switchgear according to any one of claims 1 to 13, wherein a resin layer is formed on the surface of the arc preventing frame. The switchgear according to any one of claims 1 to 13, wherein a metal layer having a Young's modulus lower than that of the arc preventing frame is formed on the surface of the flapper of the arc preventing frame. The switchgear according to any one of claims 1 to 15, wherein a stopper fitted to the ventilation hole of the perforated frame is formed on the surface of the flapper of the arc preventing frame. An enclosure that divides and houses the circuit breaker room, the cable room, and the main bus room,
A ventilation duct that communicates the inside and the outside of the housing;
A ventilation hole which is disposed inside the ventilation duct and is a passage of air, a flapper which is formed inside the ventilation hole, has a part of the ventilation hole and a connection portion, and which is formed by bending the connection portion And a frame with a flapper. The switchgear according to claim 17, wherein a washer or a bolt is attached to the flapper of the flapper frame, and the washer or the bolt protrudes from an outer periphery of the flapper of the flapper frame.

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