JP4231642B2 - Arc extinguishing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an arc extinguishing device that extinguishes an arc generated between a fixed electrode and a movable electrode when the circuit is opened.
[0002]
[Prior art]
Conventionally, a der ion grid type is known as an arc extinguishing device that extinguishes an arc generated between a fixed electrode and a movable electrode during an open circuit. This arc extinguishing device is configured by laminating a plurality of grids having U-shaped or V-shaped cutouts that can pass through movable electrodes at predetermined intervals along the moving direction of the movable electrodes, and insulate each grid from each other. It is comprised by supporting with the support member which has property.
[0003]
When an arc is generated between the fixed electrode and the movable electrode when the circuit is opened, a magnetic flux distribution that is offset due to the presence of a grid is generated around the arc column. Then, the arc is driven toward the back of the notch of the grid. For this reason, the arc is stretched and divided by each grid, and the anode / cathode drop, cooling, and the like act effectively, the arc voltage is rapidly increased, and the arc extinguishing is completed.
[0004]
[Problems to be solved by the invention]
However, the conventional grid arc extinguishing device has the following problems. That is, for example, if the line voltage is up to 3 kV, the arc can be interrupted reliably and quickly even with a conventional grid type arc extinguishing device. However, for example, when the line voltage is 5 to 6 kV or more, it is difficult to smoothly and quickly cut off the arc. Even if the arc is interrupted, unlike the case of the line voltage of 3 kV, smooth and quick interruption is difficult and the arc time becomes longer. As a result, the consumption of both electrodes is promoted, and the life of both electrodes may be shortened.
[0005]
The present invention has been made to solve the above problems, and an object of the present invention is to provide an arc extinguishing apparatus capable of improving the arc extinguishing performance.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a plurality of grids having cutout portions that allow passage of the movable electrodes are stacked at predetermined intervals, and the movable electrodes spaced from the fixed electrodes are sequentially passed through the vicinity of the center of the cutout portions of each grid. In the arc extinguishing apparatus that stretches the arc generated between both electrodes and divides and extinguishes the arc, a pair of notches are provided at the innermost part of the notches of each grid, and the movable electrodes pass through the notches Each of the grids is formed with a predetermined distance so as to face each other, and between the grids, it is formed of a synthetic resin material that has an insulating property and generates an arc extinguishing gas by contact with the arc and is movable. Interposing a partition member having a notch that allows the electrode to pass, Each grid and each partition member is disposed between a pair of support members formed of a synthetic resin material having insulation properties, Above Supported between both support members The partition member protrudes from the rear edge of the grid, and the both side edges of the partition member are provided with protruding portions that protrude from the side edges of the grid, Each partition member On both sides of the edge, it is made of a synthetic resin material that generates arc-extinguishing gas by contact with the arc. Each partition member Bulkhead extending in the front-rear direction at One Form physically Open A passage that leads the arc-extinguishing gas generated on the road to the rear of the grid From both bulkheads, grids and partition members The gist is that it was formed.
[0009]
(Function)
According to the first aspect of the present invention, the extension distance of the arc generated between the fixed electrode and the movable electrode is increased, and arc extinguishing gas is generated by the contact between the partition member and the arc. The arc extinguishing gas generated at the time of opening the circuit is led out to the rear of the grid through a passage formed by both partition walls, the grid, and the partition member. In addition, generation of an arc between both side edges of the grid is prevented by the overhanging portion.
[0010]
further Arc extinguishing gas is generated due to contact between bulkhead and arc . Addition In addition, the generation of arcs between the front end portions and the rear end portions of each grid is prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in an air switch will be described with reference to FIGS.
[0012]
As shown in FIG. 1, a power supply side bushing 13 and a load side bushing 14 are provided on each side wall of the main body case 12 of the switch 11 facing each other (in FIG. 1, only one phase is shown). The through holes are supported so as to face each other. An octagonal columnar fixed electrode 15 projects from the inner end of the power supply side bushing 13. A conductive rod 16 projects from the inner end portion of the load side bushing 14, and a base end portion of the movable electrode 18 is rotatably supported by the conductive rod 16 via a shaft 17. As shown by a two-dot chain line in FIG. 3, the movable electrode 18 is composed of a pair of contact blades 18a and 18b arranged in parallel.
[0013]
On the other hand, a rotating shaft 19 that is operatively connected to an operation handle (not shown) outside the body case 12 via a link mechanism (not shown) composed of a plurality of links or the like is provided at the lower part in the body case 12. A lever 20 is fixed to the rotation shaft 19 so as to be integrally rotatable. One end of a drive link 21 is rotatably connected to the tip of the lever 20, and the other end of the drive link 21 is rotatably connected to the vicinity of the center of the movable electrode 18. Accordingly, when the operation handle is operated, the movable electrode 18 has two points similar to the closing position indicated by the solid line in FIG. 1 centering on the shaft 17 via the link mechanism, the rotating shaft 19, the lever 20 and the drive link 21. Move between open positions indicated by chain lines.
[0014]
(Arc extinguishing device 30)
As shown in FIG. 2, an arc extinguishing device 30 is provided at the inner end of the power supply side bushing 13. The arc extinguishing device 30 includes a plurality of (eight in the present embodiment) grids 40 stacked at predetermined intervals, and partition members 50 are interposed between the grids 40, respectively. As shown in FIG. 3, each grid 40 and each partition member 50 are disposed between a pair of support members 60 and supported together.
[0015]
(Supporting member 60)
As shown in FIG. 4, the support member 60 is integrally formed of an insulating synthetic resin material, and includes a fixed portion 61 and a support portion 62 that is inclined with respect to the fixed portion 61. A plurality of sets (eight sets in the present embodiment) of grid support holes 63 each having two sets as one set are formed in the support portion 62 at predetermined intervals in the longitudinal direction of the support portion 62. Further, partition member support holes 64 are formed between the sets of grid support holes 63 in the support portion 62.
[0016]
(Grid 40)
As shown in FIG. 4, the grid 40 is made of a magnetic material such as steel and is formed in a U-shaped plate shape. A notch 41 that allows the movable electrode 18 to pass is formed at the front end edge (side edge on the load side bushing 14 side) of the grid 40. A pair of V-shaped notches 42 and 42 are formed in the innermost part of the notch 41. Both notches 42 and 42 are spaced apart by a predetermined distance so as to face the tip portions of both contact blades 18a and 18a passing through the notch 41, respectively.
[0017]
A pair of protrusions 43 and 43 are formed near the center of both side edges of the grid 40, and both the protrusions 43 and 43 are engaged with the grid support holes 63 of both support members 60 from the inside. Side engaging holes 44 are formed on both sides of the grid 40 front end side. Further, in the grid 40, a center engaging hole 45 is formed in the vicinity of the center on the innermost side of the notch 41.
[0018]
(Partition member 50)
As shown in FIG. 4, the partition member 50 is formed in a U-shape by a synthetic resin material having insulating properties and arc-extinguishing properties such as polyacetal, polytetrafluoroethylene, melamine, urea and polyamide, Arc extinguishing gas is generated by contact with the arc. A notch 51 that allows the movable electrode 18 to pass is formed at the front edge of the partition member 50. Overhang portions 52 are respectively formed on the front end sides of both side edges of the partition member 50. In addition, a protrusion 53 is formed in the vicinity of the center of both side edges of the partition member 50. Both the protrusions 53 and 53 are engaged with the partition member support holes 64 of the support members 60 and 60 from the inside, respectively.
[0019]
As shown in FIG. 3, in the partition member 50, the distance W <b> 1 between the two projecting portions 52, 52 is larger than the width W <b> 2 of the grid 40. It is supported between both support members 60 and 60 so as to protrude from both side edges of 40 respectively. The width of the part of the partition member 50 other than the two overhang portions 52, 52 is the same as the width W2 of the grid 40.
[0020]
Further, the distance L1 between the front and rear end edges of the partition member 50 (between the upper and lower end edges in FIG. 3) is set larger than the distance L2 between the front and rear end edges of the grid 40. The grid 40 is supported between both support members 60 and 60 so as to protrude from both front and rear edges. At this time, the innermost part of the notch 51 of the partition member 50 is located on the front end side of the innermost part of the notch 41 of the grid 40. In other words, the notch 51 innermost part of the partition member 50 protrudes from the notch 41 innermost part of the grid 40.
[0021]
(Partition wall)
As shown in FIG. 4, in each grid 40, side partition walls 71, 71 are mounted on both side edge portions, and a central partition wall 72 is mounted on the center portion from the rear edge side. The both side partition walls 71 and 71 and the central partition wall 72 are made of a synthetic resin material having elasticity, insulating properties and arc-extinguishing properties such as polyacetal, polytetrafluoroethylene, melamine, urea and polyamide, respectively.
[0022]
The side partition wall 71 is formed on the upper partition wall portion 71a, the lower partition wall portion 71b, the connecting portion 71c that connects the upper and lower partition wall portions 71a and 71b at their rear end portions, and the lower surface of the front end of the upper partition wall portion 71a. The engaging projection 71d forms a square ring. As shown by a two-dot chain line in FIG. 4, the front end portion side of the upper partition wall portion 71a can be elastically deformed in a direction away from the lower partition wall portion 71b with the rear end portion side as a fulcrum. The height of the side partition 71 is the same as the arrangement interval of the partition members 50, and the protruding height of the engaging protrusion 71 d is substantially the same as the thickness of the grid 40.
[0023]
The central partition wall 72 is formed on the upper partition wall portion 72a, the lower partition wall portion 72b, the connecting portion 72c that connects the upper and lower partition wall portions 72a and 72b at the rear end portions thereof, and the lower surface on the front end side of the upper partition wall portion 72a. The engaging projection 72d is formed into a quadrangular ring shape. As shown by a two-dot chain line in FIG. 4, the front end portion side of the upper partition wall portion 72a can be elastically deformed in a direction away from the lower partition wall portion 72b with the rear end portion side as a fulcrum. The height of the central partition 72 is the same as the arrangement interval of the partition members 50, and the protruding height of the engaging protrusion 72 d is substantially the same as the thickness of the grid 40.
[0024]
The side partition 71 extends in the width direction of the grid 40 from both sides of the rear end edge of the grid 40 in a state where the front end of the upper partition 71a and the lower partition 71b is expanded against the elastic force. (See FIG. 3). A grid 40 is interposed between the upper partition wall portion 71a and the lower partition wall portion 71b. The lower surface of the upper partition wall portion 71a and the upper surface of the lower partition wall portion 71b are in close contact with the upper surface and the lower surface of the grid 40, respectively. Yes. The engaging projection 72d is engaged with the center engaging hole 45 of the grid 40 from above and is in contact with the upper surface of the front end of the lower partition wall 72b.
[0025]
The central partition wall 72 has a width of the grid 40 extending from the central portion of the rear end side of the grid 40 in a state in which the space between the front end portions of the upper partition wall portion 72a and the lower partition wall portion 72b is expanded against the elastic force. It is mounted so as to be substantially orthogonal to the line segment extending in the direction (see FIG. 3). The grid 40 is interposed between the upper partition wall portion 72a and the lower partition wall portion 72b, and the lower surface of the upper partition wall portion 72a and the upper surface of the lower partition wall portion 72b are in close contact with the upper surface and the lower surface of the grid 40, respectively. Yes. The engaging projection 72d is engaged with the center engaging hole 45 of the grid 40 from above and is in contact with the top surface of the lower partition wall 72b.
[0026]
As shown in FIG. 3, the side partition walls 71 and 71 and the central partition wall 72 are parallel to each other.
(Arc extinguishing device 30 is fixed)
As shown in FIG. 5, the eight grids 40 to which the both side partition walls 71 and the central partition wall 72 are respectively attached and the seven partition members 50 are alternately stacked. As shown in FIGS. 2 and 6, the upper and lower surfaces of the both side partition walls 71 and the central partition wall 72 are in close contact with the upper and lower surfaces of the partition member 50 positioned above and below the both side partition walls 71 and the central partition wall 72, respectively. .
[0027]
As shown in FIG. 3, the protrusions 43 of the grids 40 and the protrusions 53 of the partition members 50 are formed on the support member 60. Grid support hole 63 as well as Partition member support hole 64 Both support members 60, 60 are attached so as to sandwich each grid 40 and each partition member 50 from both sides, respectively.
[0028]
As shown in FIG. 6, a rectangular parallelepiped upper spacer 81 is interposed between the upper portions of the support members 60 and 60. By inserting bolts from the outside of both support members 60, 60 and tightening them against the upper spacer 81, the upper portions of both support members 60, 60 are connected.
[0029]
Incidentally, as shown in FIG. 5, the base end portions of the brackets 91 each having a crank section in cross section are fixed to both side surfaces of the base end side of the fixed electrode 15 by two bolts (see FIG. 2). A block-like lower spacer 92 is interposed between the upper portions of the brackets 91 and 91 protruding from the upper surface of the fixed electrode 15.
[0030]
Then, as shown in FIG. 3, the upper and lower spacers 92 of the brackets 91, 91 are interposed between the fixing portions 61 of the support members 60, 60, and two bolts are respectively attached from the outside of the fixing portions 61, 61. By inserting and tightening the lower spacer 92, the fixed portions 61 of the support members 60 and 60 are connected.
[0031]
Each grid 40 and each partition member 50 are sandwiched between the support members 60 and 60 and fixed to the fixed electrode 15 in an oblique manner.
(Spacing / Aisle)
As shown in FIG. 6, when the partition members 50 move in the direction of approaching or separating from each other (vertical direction in FIG. 6), the upper and lower surfaces of the partition member 50 are mounted on the grid 40 that is disposed adjacent to the upper and lower sides. The both side partition walls 71, 71 and the central partition wall 72 are regulated by coming into contact with the upper and lower end edges respectively. In other words, the vertical movement of each grid 40 is performed by the partition members 50 in which the upper and lower end edges of the both side partition walls 71 and 71 and the central partition wall 72 mounted on each grid 40 are adjacently disposed above and below the grid 40. It is regulated by abutting on the bottom surface and the top surface, respectively.
[0032]
Thereby, the distance between each partition member 50 and the distance between each grid 40, and the space | interval of the partition member 50 and the grid 40 by extension are each hold | maintained uniformly. A plurality of spaces surrounded by the side partition walls 71 and 71, the central partition wall 72, the grid 40, and the partition member 50 constitute a passage S that guides the arc-extinguishing gas generated at the time of opening to the rear of the grid 40. . Further, the side partition walls 71 and the central partition walls 72 constitute interval holding members that keep the intervals between the partition members 50 and the grids 40, and the intervals between the partition members 50 and the grids 40, respectively.
[0033]
(Operation of the embodiment)
Next, the operation when the switch configured as described above is opened will be described.
In the closed state shown by a solid line in FIG. 1, when the operation handle is opened, the lever 20 rotates to the left via the rotation shaft 19. Along with this, the drive link 21 is moved upward, and the movable electrode 18 rotates to the right about the shaft 17. When the movable electrode 18 is separated from the fixed electrode 15, an arc is generated between the electrodes 15 and 18, that is, between the fixed electrode 15 and the contact blades 18 a and 18 b.
[0034]
As shown in FIG. 7, a magnetic flux distribution that is offset due to the presence of the grid 40 is generated around the arc column. The arc is driven toward the back of the grid 40 (in the direction of the arrow in FIG. 7) by the centrifugal force of both the contact blades 18a and 18b and the electromagnetic force generated in the grid 40 based on the Fleming left-hand rule. Concentrate on 42. This is because the arc is driven to the back by electromagnetic force. Incidentally, when the notches 42 are not provided, the arc concentrates on the corners of the notch 41.
[0035]
For this reason, the arc is stretched and divided by each grid 40 and each partition member 50, and anode / cathode lowering, cooling and the like act effectively, and the arc voltage is rapidly increased. Incidentally, when the partition member 50 is not interposed between the grids 40, the arc is stabilized near the center between the innermost part of the notch 41 and the rear edge of the grid 40.
[0036]
The arc is stretched between the fixed electrode 15 and the movable electrode 18 so as to pass through the grids 40 as the movable electrode 18 moves in the opening direction. At this time, arc extinguishing gas is generated from the portion of each partition member 50 exposed to the arc (inner peripheral edge of the cutout portion 51). Further, the side partition walls 71 and 71 and the central partition wall 72 are each formed of a synthetic resin material having arc extinguishing properties, and are disposed in the vicinity of the arc point. For this reason, arc extinguishing gas is also generated from the portions of the side partition walls 71 and 71 and the central partition wall 72 that are exposed to the arc.
[0037]
Since both side portions between the grids 40 and between the partition members 50 are closed by the both side partition walls 71, 71, the arc extinguishing gas is prevented from escaping from both side portions of the arc extinguishing device 30. For this reason, the arc extinguishing gas concentrates on the arc generation site (around the arc flying between the grids 40). And arc-extinguishing is accelerated | stimulated because an arc and arc-extinguishing gas contact efficiently.
[0038]
Further, due to the generation of the arc extinguishing gas, the pressure on the front end edge side of the grid 40 in the passage S becomes larger than the pressure on the rear end edge side of the grid 40 in the passage S. For this reason, the arc extinguishing gas flows in the passage S from the front end side to the rear end side of the grid 40 and is led out behind the grid 40. This arc extinguishing gas blows the arc to the rear of the grid 40 and further stretches the arc. That is, arc extinguishing is promoted by the effect of blowing off the arc by the arc extinguishing gas flowing behind the grid 40.
[0039]
A central partition wall 72 is disposed between the both side partition walls 71, 71, and the space between the grid 40 and the partition member 50 is further divided into two. That is, compared with the case where the central partition 72 is not provided, the cross-sectional areas of the respective passages S are made smaller, thereby increasing the flow rate of the arc extinguishing gas to the rear of the grid 40. Thereby, the effect of blowing off the arc by the arc extinguishing gas is improved, and the arc extinction is further promoted.
[0040]
The arc extinguishing gas that has once exhibited arc extinguishing performance contains metal vapor and causes re-ignition, but as described above, the arc extinguishing gas is quickly led out behind the grid 40. For this reason, re-ignition is prevented.
[0041]
When the movable electrode 18 moves to the open position indicated by the two-dot chain line in FIG. 1, the arc is completely extinguished and the opening operation is completed. When the circuit is closed, an operation opposite to that of the above-described circuit is performed.
[0042]
(Effect of embodiment)
Therefore, according to the present embodiment, the following effects can be obtained.
(1) Between each grid 40, the insulating partition member 50 which has the notch part 41 which can let the movable electrode 18 pass is each interposed. For this reason, when the circuit is opened, an arc generated between the fixed electrode 15 and the movable electrode 18 is drawn between the grids 40 so as to bypass the partition members 50. That is, the arc path is serpentine. Therefore, the arc stretching distance is increased, and the arc extinguishing performance can be improved. Further, the arc time can be shortened. As a result, consumption of both electrodes 15 and 18 is suppressed, and the lifetime of both electrodes 15 and 18 is improved.
[0043]
(2) Overhang portions 52 that protrude from the side edge portions of the grid 40 are provided on both side edge portions of the partition member 50. For this reason, an arc does not wrap around to the side of each grid 40, and generation of an arc between both side portions of each grid 40 can be prevented.
[0044]
(3) Side partition walls 71 are provided on both side edges of each grid 40, and both side sections between the grids 40 and between the partition members 50 are closed by the both side partition walls 71, 71. For this reason, the arc extinguishing gas is prevented from escaping from both sides of the arc extinguishing device 30. Therefore, the arc extinguishing gas concentrates on the arc generation site and the arc extinguishing is promoted.
[0045]
(4) Each grid 40 is provided with two side partition walls 71 and a central partition wall 72, and is opened from both side partition walls 71 and 71, the central partition wall 72, the grid 40, and the partition member 50. A plurality of passages S for leading the arc extinguishing gas generated at times to the rear of the grid 40 are formed. The arc extinguishing gas generated when the circuit is opened is led to the rear of the grid 40 through the passage S. Arc extinguishing is promoted by the effect of blowing off the arc extinguishing gas.
[0046]
(5) Two grids 71, 71 and a central partition 72 are mounted on each grid 40, respectively. The upper and lower end edges of the side partition walls 71 and 71 and the central partition wall 72 are in close contact with the lower and upper surfaces of the two partition members 50 and 50 positioned above and below the grid 40 on which they are mounted. did. For this reason, the distance between each partition member 50 and the distance between each grid 40, and by extension, the space | interval of the partition member 50 and the grid 40 can each be kept constant.
[0047]
(6) The partition member 50 is formed of a synthetic resin material that generates arc-extinguishing gas when in contact with the arc. For this reason, unlike the case where the partition member 50 is formed of a simple insulating material, arc-extinguishing gas is generated from the partition member 50 by being exposed to an arc when the circuit is opened. Arc extinguishing is promoted by the arc extinguishing gas, and the arc extinguishing performance of the arc extinguishing device 30 can be improved.
[0048]
(7) The side partition walls 71 and the central partition walls 72 are each formed of a synthetic resin material that generates arc-extinguishing gas by contact with an arc. Therefore, unlike the case where the side partition walls 71 and the central partition walls 72 are each formed of a simple insulating material, the arcs are extinguished from the side partition walls 71 and the central partition walls 72 by being exposed to an arc when the circuit is opened. Gas is generated. Therefore, unlike the case where each partition member 50 is formed of a synthetic resin material having arc extinguishing properties, the amount of arc extinguishing gas generated at the time of opening can be increased.
[0049]
(8) The partition member 50 was formed so as to protrude from the front end portion (including the innermost portion of the cutout portion 41) and the rear end portion of the grid 40, respectively. For this reason, generation | occurrence | production of the arc between the front-end parts of each grid 40 and between rear-end parts can be prevented.
[0050]
(9) The grid-type arc extinguishing device 30 is provided in the switch 11 as an in-air switch. In general, a slit arc extinguishing chamber is provided for an air switch, and a grid arc extinguishing device is provided for a gas switch. In this embodiment, the arc extinguishing performance is improved by interposing the partition members 50 between the grids 40. For this reason, grid extinction is possible in the switch 11.
[0051]
Also, the grid type arc extinguishing device is generally smaller than the slit arc extinguishing chamber. Therefore, unlike the case where the slit arc extinguishing chamber is provided, the arc extinguishing device can be reduced in size, and the switch 11 as a whole can be reduced in size.
[0052]
(Another example)
In addition, you may implement the said embodiment as follows.
-As shown in FIG. 8, you may make it form the partition member 50, the side part partition 71, and the center part partition 72 each integrally. And the grid 40 is interposed between each partition member 50, respectively. In this way, the number of parts can be reduced. Further, the assembly work of the arc extinguishing device 30 is simplified.
[0054]
-In this embodiment, although the arc-extinguishing apparatus 30 was provided in the switch 11 as an in-air switch, you may make it provide in a gas switch. In this way, the arc extinguishing performance of the gas switch can be further improved.
[0055]
-The central partition 72 may be omitted. Even in this case, both side portions between the grids 40 and between the partition members 50 are closed by the both side partition walls 71, 71. Therefore, it is possible to prevent the arc extinguishing gas generated at the time of opening the circuit from escaping from both sides of the arc extinguishing device 30.
[0056]
In the present embodiment, only one central partition 72 is disposed between the two side partitions 71, 71, but two, three, or more may be disposed. That is, the passage S is further subdivided. In this way, the cross-sectional area of each passage S is further reduced. For this reason, the flow velocity to the rear of the arc extinguishing gas generated at the time of opening is further increased. Therefore, the effect of blowing off the arc by the arc extinguishing gas is increased, and the arc extinguishing performance can be improved.
[0057]
In the present embodiment, the partition members 50 are interposed between all the grids 40. However, for example, the partition members 50 may be interposed between at least a majority of the grids 40. Even if it does in this way, unlike the case where the partition member 50 is not provided, the stretch distance of an arc increases and arc extinguishing performance can be improved.
[0058]
In the present embodiment, the two notches 42 are formed at the innermost part of the notch portion 41 so as to correspond to the contact blades 18a and 18a, respectively, but the two notches 42 are respectively formed at both corners of the notch portion 41. You may make it form. In this way, the arc can be concentrated at both corners of the notch 41.
[0059]
【The invention's effect】
According to the present invention, the arc extinguishing performance can be improved by increasing the arc stretching distance.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a switch according to an embodiment.
FIG. 2 is a front view of an arc extinguishing device in the present embodiment.
FIG. 3 is a plan view of the arc extinguishing device in the present embodiment.
FIG. 4 is an exploded perspective view of the arc extinguishing device in the present embodiment.
FIG. 5 is an exploded perspective view of the arc extinguishing device in the present embodiment.
FIG. 6 is a main part rear view of the arc extinguishing apparatus according to the present embodiment.
FIG. 7 is a plan view of a grid in the present embodiment.
FIG. 8 is an exploded perspective view of an arc extinguishing device according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Switch (air switch), 12 ... Main body case, 13 ... Power supply side bushing, 14 ... Load side bushing, 15 ... Fixed electrode, 18 ... Movable electrode, 30 ... Arc extinguishing device, 40 ... Grid, 41 ... Notch portion of grid, 50 ... partition member (interval holding member), 52 ... projecting portion, 71 ... side partition wall (partition wall), 72 ... center partition wall (partition wall),
S: Passage.

Claims (1)

An arc generated between both electrodes by stacking multiple grids with cutouts that can pass through the movable electrodes at predetermined intervals, and sequentially passing the movable electrodes separated from the fixed electrodes around the center of the cutouts of each grid In the arc extinguishing device that stretches and divides and extinguishes,
A pair of cutouts are formed at the innermost part of the cutout portions of the grids so as to be opposed to the tip portions of the movable electrodes that pass through the cutout portions, and are insulated between the grids. And a partition member having a notch portion that is formed of a synthetic resin material that generates arc extinguishing gas by contact with the arc and that can pass through the movable electrode, respectively,
Each grid and each partition member is disposed between a pair of support members formed of a synthetic resin material having insulation properties,
The partition member supported between the two support members protrudes from the rear end edge of the grid, and both side edges of the partition member are provided with protruding portions that protrude from the side edge portions of the grid,
Wherein the side edge portion of each of the partition members, the partition wall and an body formed extending in the longitudinal direction in each of the partition members together is formed of a synthetic resin material generating arc extinguishing gas by contact with the arc, open An arc extinguishing apparatus in which a path for leading arc extinguishing gas generated on the road to the rear of the grid is formed by both partition walls, the grid, and the partition member .

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