JP2004055148A - Arc extinguishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arc extinguishing device capable of improving shut-off performance while suppressing the enlargement of the device. <P>SOLUTION: Each grid 31 of a grid type arc extinguishing device 30 is integrally revolved in the direction including the stretching direction component (revolution to the right) of the arc so that each grid synchronously follows the stretched arc associated with the revolution of a moving electrode 20 in the opening path direction (revolution to the left) when a path is opened. By this, an arc formed between fixed electrode 16 and the moving electrode 20 is stretched in a state of being attracted to each grid 31. Therefore, the stretched distance of the arc can be increased in comparison to a case where the grid type arc extinguishing device 30 is a fixed type, and the arc extinguishing function can be improved. Furthermore, the enlargement of the grid type arc extinguishing device 30 is suppressed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD 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 a circuit is opened.
[0002]
[Prior art]
Conventionally, for example, a grid type arc extinguishing device is known as this type of arc extinguishing device. This grid type arc extinguishing device includes a plurality of grids stacked at predetermined intervals so as to be along the moving direction of the movable electrode. This grid is formed with a U-shaped or V-shaped notch that can pass through the movable electrode. Each grid is supported on the fixed electrode side by a supporting member having an insulating property.
[0003]
When an arc is generated between the fixed electrode and the movable electrode when the circuit is opened, a biased magnetic flux distribution is generated around the arc column due to the existence of the grid. Then, the arc is driven toward the depth of the notch of the grid. For this reason, the arc is stretched and divided by each grid, the anode / cathode fall, cooling, etc. effectively act, the arc voltage is rapidly increased, and the arc extinguishing is completed.
[0004]
[Problems to be solved by the invention]
However, the conventional arc extinguishing device for a switch has the following problems. That is, the only way to improve the breaking performance of the grid type arc extinguishing device is to increase the size of the arc extinguishing device, and the switch main body must be enlarged accordingly. It has been difficult to improve the breaking performance in a small space without increasing the size of the grid extinguishing device.
[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 device that can improve breaking performance while suppressing an increase in size.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a plurality of grids each having a cutout portion that allows the movable electrode to pass therethrough are stacked at predetermined intervals, and the movable electrode that is separated from the fixed electrode sequentially passes near the center of the cutout portion of each grid. In the arc extinguishing apparatus, which stretches and breaks the arc generated between the two electrodes to extinguish the arc, the respective grids are configured to be operable to move in a direction including the direction of the arc stretching direction, and the movable electrode The gist of the present invention is that the grids are integrally moved so as to synchronously follow an arc that is stretched along with the movement in the opening direction.
[0007]
According to a second aspect of the present invention, in the arc extinguishing apparatus, the arc generated between the fixed electrode and the movable electrode is extinguished in the arc extinguishing chamber fixed to the fixed electrode side when the circuit is opened. An arc inducing means for attracting the arc is provided outside the chamber, and the arc inducing means is configured to be operable to move in a direction including an extending direction component of the arc, and is extended as the movable electrode moves in the opening direction. The gist is that the arc inducing means is moved so as to follow the arc synchronously.
[0008]
According to a third aspect of the present invention, in the arc extinguishing apparatus, the arc generated between the fixed electrode and the movable electrode is extinguished in an arc extinguishing chamber provided on the fixed electrode side when the circuit is opened. The chamber is configured to be operable to move in a direction including the arc extending direction component, and the arc extinguishing chamber is moved so as to follow the arc being extended in synchronization with the arc being extruded. The point is that the means is provided.
[0009]
According to a fourth aspect of the present invention, in the arc extinguishing device according to the second aspect, the arc attraction means includes a plurality of grids each having a cutout portion in which the arc extinguishing chamber can be arranged. The invention is characterized in that an arc extinguishing chamber is arranged, and each grid is configured to move along the outer surface of the arc extinguishing chamber and integrally with the movement of the movable electrode in the opening direction.
[0010]
According to a fifth aspect of the present invention, in the arc extinguishing device according to the third aspect, the arc inducing means is a plurality of grids fixed so as to be integrally rotatable with respect to the arc extinguishing chamber. I do.
(Action)
According to the first aspect of the invention, when the movable electrode separated from the fixed electrode sequentially passes near the center of the notch of each grid, the arc generated between the two electrodes is elongated, cut off, and extinguished. . Further, the grids move integrally in a direction including the extension direction component of the arc so as to synchronously follow an arc extended in accordance with the movement of the movable electrode in the opening direction. Since the arc is stretched while being attracted to each grid, the stretching distance of the arc increases.
[0011]
According to the second aspect of the present invention, the arc inducing means moves in a direction including the extending direction component of the arc so as to synchronously follow an arc extended with the movement of the movable electrode in the opening direction. In the arc extinguishing chamber, the arc is stretched while being drawn toward the arc inducing means, and extinguished.
[0012]
According to the third aspect of the present invention, the arc extinguishing chamber moves in a direction including the arc extending direction component so as to synchronously follow an arc extended with the movement of the movable electrode in the opening direction. The arc is stretched while being drawn toward the arc inducing means, and is extinguished.
[0013]
According to the fourth aspect of the present invention, in addition to the operation of the arc extinguishing device according to the second aspect, each grid extends along the outer surface of the arc extinguishing chamber as the movable electrode moves in the opening direction. Moving. The arc generated between the two electrodes is drawn to the back of the notch of each grid by the action of the magnetic field generated in each grid, and is stretched along the inner wall of the back of the notch of each grid in the arc-extinguishing chamber. The arc is extinguished.
[0014]
According to the fifth aspect of the present invention, in addition to the operation of the arc extinguishing device according to the third aspect, the arc extinguishing is performed so as to synchronously follow an arc that is extended with the movement of the movable electrode in the opening direction. The arc chamber moves in a direction that includes a component of the arc stretching direction. Each grid moves integrally with the arc extinguishing chamber. For this reason, the arc generated between both electrodes is wrapped in the arc-extinguishing chamber while being driven to the back of the notch of each grid.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in an arc extinguishing device for a switch will be described with reference to FIGS.
[0016]
As shown in FIG. 1, a power supply-side bushing 13 and a load-side bushing 14 are provided on both sides of the main body case 12 of the switch 11 facing each other for each of three phases (only one phase is shown in FIG. 1). It is penetrated and supported so as to face each other. A conductive rod 15 protrudes from the inner end of the power supply side bushing 13, and a fixed electrode 16 is fixed to the conductive rod 15. In addition, a pair of pins 17 is provided on the outer peripheral surface on the inner end side of the power supply side bushing 13 so as to protrude from the opposite side. A conductive rod 18 projects from an inner end of the load-side bushing 14, and a base end of the movable electrode 20 is rotatably supported on the conductive rod 18 via a shaft 19. The movable electrode 20 is composed of a single flat contact blade.
[0017]
On the other hand, a rotating shaft 21 operatively connected to an operation handle (not shown) outside the main case 12 is provided at an upper portion in the main case 12 through a link mechanism (not shown) including a plurality of links and the like. A lever 22 is fixed to the rotating shaft 21 so as to be integrally rotatable. One end of a drive link 23 is rotatably connected to the tip of the lever 22, and the other end of the drive link 23 is rotatably connected to the vicinity of the center of the movable electrode 20. One end of an operation link 24 is rotatably connected to the end of the lever 22.
[0018]
Accordingly, with the opening / closing operation of the operation handle, the movable electrode 20 is turned on the shaft 19 via the link mechanism, the rotating shaft 21, the lever 22, and the drive link 23 as shown in FIG. Move between open position. Note that an inter-ground barrier B is provided along the inner bottom surface of the main body case 12.
[0019]
(Arc extinguisher)
As shown in FIG. 2, a grid type arc extinguishing device 30 is provided inside the main body case 12 at the inner end of the power supply side bushing 13. The grid-type arc extinguishing device 30 includes a plurality of (three in this embodiment) grids 31 stacked at predetermined intervals, and each of the grids 31 is collectively supported by a support member 32 (FIG. 5).
[0020]
As shown in FIG. 6, the grid 31 is formed in a U-shape plate by a magnetic material such as a steel material. A notch 33 that allows the movable electrode 20 to pass through is formed at the leading edge (lower edge in FIG. 6) of the grid 31, and a V-shaped notch 34 is formed at the center of the innermost part of the notch 33. Have been. The cutouts 34 are arranged so as to respectively face the front ends of the movable electrodes 20 passing through the cutouts 33. A pair of projections 35 are formed on the base end sides of both side edges of the grid 31.
[0021]
As shown in FIG. 6, the support member 32 is formed of a synthetic resin material having an insulating property in a U-shape in plan view. A set (three sets in the present embodiment) of grid support holes 32 a is formed at the same interval as the arrangement interval of each grid 31. The two projections 35 of the grid 31 are engaged with the respective grid support holes 32a from the inside.
[0022]
As shown in FIG. 5, two long and short pins 32b and 32c protrude near the center of the outer surface of the side wall of the support member 32 facing each other. One ends of connecting links 36, 36 are rotatably connected to the pins 32b, 32c, respectively, and the other ends of the connecting links 36, 36 are rotatably connected to the pins 17, 17, respectively. I have. The other end of the operation link 24 is rotatably connected to the pin 32b.
[0023]
Accordingly, in conjunction with the opening operation by the operation handle, the grid type arc extinguishing device 30 moves downward about the pins 17 and 17 as fulcrums via the link mechanism, the rotating shaft 21, the lever 22, and the operating link 24, and It rotates rightward in FIG. 2 around the pins 32b and 32c as a fulcrum.
[0024]
(Operation of the embodiment)
Next, the operation of the arc extinguishing device configured as described above will be described.
As shown in FIG. 2, when the operation handle is opened during the opening of the circuit, the lever 22 rotates to the left via the rotating shaft 21. Along with this, the drive link 23 is moved downward, and the movable electrode 20 turns left around the shaft 19. As shown in FIG. 3, when the movable electrode 20 is separated from the fixed electrode 16, an arc is generated between the electrodes 16 and 20.
[0025]
As shown in FIG. 6, a biased magnetic flux distribution is generated around the arc column due to the existence of the grid 31. Due to the centrifugal force of the movable electrode 20 and the electromagnetic force generated in the grid 31 based on Fleming's left hand rule, the arc is driven toward the depth of the notch 33 in the grid 31 (in the direction of the arrow in FIG. 6). concentrate. For this reason, as shown in FIG. 3, as the movable electrode 20 moves in the opening direction (rotation to the left in FIG. 3), the arc is elongated and divided by each grid 31, and the anode / cathode drop, cooling, etc. Works effectively, and the arc voltage is rapidly increased. The arc is stabilized near the center between the deepest part of the notch 33 of the grid 31 and the base edge (upper edge in FIG. 6).
[0026]
On the other hand, when the operation link 24 is moved downward with the left rotation of the lever 22, the grid type arc extinguishing device 30 is moved downward via the pin 32b, and the two pins 17 of the power supply side bushing 13 are moved. , 17 to the right. That is, the grid-type arc extinguishing device 30 synchronously follows the left rotation of the movable electrode 20 and moves in a direction including a component of the arc extending direction, and so that each grid 31 and the movable electrode 20 cross each other. Accordingly, the arc generated between the electrodes 16 and 20 is extended so as to pass through each grid 31 (see FIG. 3).
[0027]
For this reason, compared with the case where the grid type arc extinguishing device 30 is fixed to the fixed electrode 16 side, the arc path, that is, the arc extending distance is increased. The extending distance of the arc increases as the grid type arc extinguishing device 30 rotates right and the movable electrode 20 rotates left. Then, when the movable electrode 20 moves to the open position shown in FIG. 4, the arc is completely extinguished and the opening operation ends. When the circuit is closed, the operation reverse to that described above is performed.
[0028]
(Effects of the embodiment)
Therefore, according to the present embodiment, the following effects can be obtained.
When the circuit is opened, a grid-type arc quenching is performed so as to follow the rotation of the movable electrode 20 in the opening direction in a direction including the extension direction component of the arc and so that each grid 31 and the movable electrode 20 cross each other. The device 30 was configured to be moved. For this reason, the arc is stretched while being attracted to each grid 31. Therefore, the extension distance of the arc is increased, and the arc extinguishing performance (and thus the breaking performance) can be improved. Also, unlike the case where the number of grids 31 is increased, for example, in order to improve the arc extinguishing performance, an increase in the size of the grid type arc extinguishing device 30 is also suppressed.
[0029]
(2nd Embodiment)
Next, a second embodiment of the present invention will be described. This embodiment differs from the first embodiment in that a narrow arc extinguishing chamber is further provided at the inner end of the power supply side bushing. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.
[0030]
As shown in FIG. 7, a narrow arc extinguishing chamber 40 is provided at the inner end of the power supply side bushing 13. The narrow arc extinguishing chamber 40 includes a narrow arc extinguishing chamber main body 41 provided so as to cover the fixed electrode 16, and a bottom cover provided to close a base end opening of the narrow arc extinguishing chamber main body 41. 42. The narrow arc extinguishing chamber main body 41 and the bottom cover 42 are formed of a synthetic resin material having an arc extinguishing property and an insulating property.
[0031]
The narrow arc extinguishing chamber main body 41 interconnects the pair of narrow arc extinguishing members 41a and 41b (see FIG. 10) and the two narrow arc extinguishing members 41a and 41b facing each other at the side edge on the power supply side bushing 13 side. The rear wall 41c is provided. The two arc extinguishing members 41a and 41b are formed obliquely with respect to the bottom cover 42 and are separated from each other so that the movable electrode 20 can pass therethrough. Further, the distal ends of the narrow gap arc extinguishing members 41a and 41b are tapered portions that are expanded in a direction away from each other.
[0032]
As shown in FIG. 10, the width of the notch 33 of each grid 31 is slightly larger than the distance between the outer surfaces of the narrow arc extinguishing members 41a and 41b. The narrow gap extinguishing members 41a and 41b are inserted into the notches 33 of each grid 31, and the gap between the inner peripheral edge of the notch 33 of each grid 31 and the outer surfaces of both narrow arc extinguishing members 41a and 41b. , And a slight gap is formed between the inner peripheral edge of the notch 33 and the inner wall 41c. Therefore, with the opening / closing operation of the operation handle, each grid 31 does not interfere with the narrow arc extinguishing chamber 40 and the outer surface of the narrow arc extinguishing chamber 40 (strictly speaking, the gap extinguishing members 41a and 41b Move along the outer surface).
[0033]
The narrow arc extinguishing chamber 40 forms an arc extinguishing chamber fixed to the fixed electrode 16 side. Further, each grid 31 is provided outside the narrow arc extinguishing chamber 40 and constitutes an arc inducing means for attracting the arc generated between the electrodes 16 and 20.
[0034]
(Operation of the embodiment)
As shown in FIG. 8, when the operation handle is opened in the closed state, the movable electrode 20 rotates in the opening direction to move between the narrow gap extinguishing members 41a and 41b from above in FIG. Move down. The movable electrode 20 is sandwiched between the narrow gap extinguishing members 41a and 41b, and the arc generated between the electrodes 16 and 20 is elongated while the narrow gap is extinguished. At this time, the arc extinguishing gas generated by the arc heat promotes arc extinguishing.
[0035]
On the other hand, at the time of the opening operation, the grid type arc extinguishing device 30 synchronously follows the left rotation of the movable electrode 20 so that each grid 31 and the movable electrode 20 intersect with each other in a direction including the component of the arc extending direction. Go to At this time, each grid 31 moves along the outer surfaces of the narrow arc extinguishing members 41a and 41b of the narrow arc extinguishing chamber 40 without interfering with the narrow arc extinguishing chamber 40. In the narrow arc extinguishing chamber 40, the arc is driven toward the back of the notch 33 in each grid 31 and is stretched along the inner surface of the back wall 41 c of the narrow arc extinguishing chamber main body 41. The grid-type arc extinguishing device 30 functions as an arc inducing unit that draws the arc toward itself.
[0036]
For this reason, compared with the case where only the narrow arc extinguishing chamber 40 is used, the arc path (extending distance of the arc) becomes longer. The extension distance of the arc path increases as the grid type arc extinguishing device 30 rotates clockwise and the movable electrode 20 rotates counterclockwise. Then, as shown in FIG. 9, when the movable electrode 20 moves to the open position, the arc is completely extinguished and the opening operation ends.
[0037]
(Effects of the embodiment)
Therefore, according to the present embodiment, the following effects can be obtained.
A grid type arc extinguishing device 30 is provided outside the narrow arc extinguishing chamber 40. Then, the grid-type arc extinguishing device 30 is moved in a direction including the elongation direction component of the arc in synchronization with the rotation of the movable electrode 20 in the opening direction so as not to interfere with the narrow arc extinguishing chamber 40. Configured. Therefore, at the time of the opening operation, the arc is driven in the depth direction of each grid 31, and is stretched along the inner surface of the depth wall 41c. Therefore, the arc path in the narrow arc extinguishing chamber 40 is increased, and the arc extinguishing performance can be improved. Further, it is not necessary to increase the size of the narrow arc extinguishing chamber 40 (increase the length of the movable electrode 20 in the opening direction) in order to improve the arc extinguishing performance. In this manner, the arc extinguishing performance and, consequently, the breaking performance of the switch 11 can be improved while suppressing an increase in the size of the arc extinguishing device.
[0038]
(Third embodiment)
Next, a third embodiment of the present invention will be described. This embodiment is different from the second embodiment in that an arc-extinguishing chamber is provided rotatably with respect to the inner end of the power supply side bushing, and a plurality of grids are fixed to this arc-extinguishing chamber so as to be able to rotate integrally. different.
[0039]
As shown in FIG. 11, a small-diameter portion 13a is formed at the inner end of the power-supply-side bushing 13, and a rod-shaped fixed electrode 51 protrudes from the tip of the small-diameter portion 13a. As shown in FIGS. 11 and 14, a support S is inserted through the small diameter portion 13a from the inner end side, and a pair of pins 52, 52 are located on the outer peripheral surface of the support S on opposite sides. It is protruded as follows. The support S is integrally formed of an insulating and arc-extinguishing synthetic resin such as polyacetal, polytetrafluoroethylene, melamine, urea, and nylon.
[0040]
On the other hand, a support member 53 is fixed to the inner end of the load-side bushing 14 via a conductive rod. The base end of the movable electrode 54 is rotatably supported on the support member 53 via a shaft 55. ing. As shown in FIG. 16, the movable electrode 54 includes a pair of contact blades 54a and 54b arranged in parallel.
[0041]
(Movable arc extinguishing chamber)
As shown in FIG. 11, a movable arc-extinguishing chamber 61 is provided at the inner end of the power supply side bushing 13 so as to cover the fixed electrode 51 and to be rotatable around the pins 52, 52. The movable arc extinguishing chamber 61 is integrally formed of an insulating and arc extinguishing synthetic resin such as polyacetal, polytetrafluoroethylene, melamine, urea, and nylon.
[0042]
As shown in FIGS. 11 and 15, the movable arc-extinguishing chamber 61 protrudes along the first accommodating portion 71 where the inner end of the power supply side bushing 13 is located and along the center of the outer peripheral surface of the first accommodating portion 71. A second accommodating portion 72 provided at the tip of the fixed electrode 51, and the insides of both accommodating portions 71, 72 communicate with each other. The side wall 71a on the load side bushing 14 side of the first housing portion 71 and the side wall 72a on the load side bushing 14 side of the second housing portion 72 are each formed in an arc shape. When the movable arc-extinguishing chamber 61 rotates about the pins 52, 52, the inner end of the power supply-side bushing 13 and the tip of the fixed electrode 51 relatively extend along the inner surfaces of the side walls 71a, 72a, respectively. To move.
[0043]
(First accommodation section)
As shown in FIGS. 14 and 15, semi-circular shaft attachment portions 73 protrude from a pair of side walls of the first housing portion 71 facing each other on the side edge of the power supply side bushing 13 side. The shaft attachment portions 73, 73 are formed with insertion holes 73a, respectively. Both pins 52, 52 are inserted through both insertion holes 73a, 73a, and the movable arc-extinguishing chamber 61 is rotatable around both pins 52, 52.
[0044]
In addition, operating pins 74 are protrudingly provided on outer surfaces of both side walls of the first housing portion 71, respectively. The other ends of the operation links 24, 24 are rotatably connected to the operation pins 74, 74, respectively. Therefore, at the time of opening / closing operation, the movable arc-extinguishing chamber 61 is opened via the link mechanism (not shown), the rotating shaft 21, the lever 22, the operating link 24, and the operating pin 74 and the opening corresponding position shown in FIG. Move between corresponding positions.
[0045]
(Second accommodation section)
As shown in FIGS. 14 and 15, two outer narrow walls 75, 75 face outward (toward the non-power-supply-side bushing 13) on the base end sides of the opposing side walls of the second housing portion 72. And the central slit wall 76 is projected so as to be located between the outer slit walls 75, 75. As shown in FIG. 16, the distance between both outer narrow walls 75, 75 and the central narrow wall 76 is slightly larger than the thickness of the two contact blades 54a, 54b, respectively. 54b is able to pass between both outer narrow walls 75, 75 and the central narrow wall 76, respectively.
[0046]
(grid)
As shown in FIGS. 14 to 16, grid support members 77, 77 are diagonally fixed to the lower portions of the outer surfaces of both opposing side walls of the first storage portion 71, respectively. A plurality (three in the present embodiment) of grids 78 are stacked and supported at predetermined intervals.
[0047]
As shown in FIGS. 14 and 15, the grid support member 77 is formed of a synthetic resin material having an insulating property, and the grid support member 77 includes a plurality of sets (two in the present embodiment). (Set) of grid support holes 77a are formed at predetermined intervals in the longitudinal direction of the grid support member 77.
[0048]
As shown in FIGS. 15 and 16, the grid 78 is formed in a U-shaped plate shape by a magnetic material such as a steel material. A notch 78 a is formed at the front end of the grid 78, and the width of the notch 78 a is slightly larger than the distance between the opposing side walls of the first housing 71. Further, a pair of V-shaped notches 78b, 78b are formed at the innermost part of the notch 78a. The notches 78b, 78b are separated from each other by a predetermined distance, and are opposed to the tips of the contact blades 54a, 54b passing through the notch 78a.
[0049]
As shown in FIG. 15, a pair of projections 78c, 78c are formed near the center of both side edges of the grid 78, respectively. Both projections 78c, 78c are engaged with the respective grid support holes 77a of both grid support members 77, 77 from inside. In other words, each grid 78 is supported so as to be integrally rotatable with respect to the movable arc-extinguishing chamber 61 by being sandwiched from both sides by the two grid support members 77, 77. The first accommodating portions 71 of the movable arc-extinguishing chamber 61 are arranged in the notches 78a of the grids 78, respectively.
[0050]
Of the grids 78, the innermost part of the notch 78a of the lowermost grid 78 in FIGS. 11 to 14 and the tip of the movable electrode 54 during the opening shown in FIG. 12 and the opening shown in FIG. The depth of the cutout portion 78a of the grid 78 is set so that the distance between them becomes the minimum insulation distance. That is, the notch 78a of the lowermost grid 78 is made shallower than the notch 78a of the other grid 78.
[0051]
The movable arc extinguishing chamber 61 constitutes an arc extinguishing chamber configured to be operable to move in a direction including an arc extending direction component. Each grid 78 is provided in the movable arc extinguishing chamber 61 and constitutes an arc inducing means for attracting an arc generated between the electrodes 51 and 54.
[0052]
(Operation of the embodiment)
Now, in the closed state shown in FIG. 11, when the operation handle is opened, the movable electrode 54 rotates leftward about the shaft 55 via the rotating shaft 21, the lever 22, and the drive link 23. When the movable electrode 54 is separated from the fixed electrode 51, an arc is generated between the electrodes 51 and 54.
[0053]
On the other hand, the operating link 24 is moved downward with the left rotation of the lever 22 by the opening operation. Then, the movable arc-extinguishing chamber 61 rotates rightward about the two pins 52, 52 of the power supply side bushing 13 while being moved downward via the two operation pins 74, 74. That is, the movable arc extinguishing chamber 61 moves in a direction including the arc extending direction component in conjunction with the left rotation of the movable electrode 54. Each of the grids 78 rotates rightward together with the movable arc extinguishing chamber 61 and moves in a direction including a component of a direction in which the arc is extended.
[0054]
When each grid 78 and the movable electrode 54 intersect each other, the arc generated between the electrodes 51 and 54 is driven toward the back of each grid 78 and concentrates on both notches 78a and 78a. As shown in FIG. 12, the arc is extended and divided by each grid 78 in accordance with the opening operation. As a result, the anode / cathode drop, cooling and the like effectively act, and the arc voltage is rapidly increased. The arc is stretched so as to pass through each grid 31.
[0055]
As shown in FIG. 12, as the movable arc extinguishing chamber 61 rotates to the right, the side wall 71a of the first accommodating portion 71 and the side wall 72a of the second accommodating portion 72 respectively move the arc generating portion of the fixed electrode 51 and the movable electrode. The electrode enters between the electrodes 51 and 54 so as to block a line segment connecting the arc generating portion with a straight line. Further, the two contact blades 54a and 54b of the movable electrode 54 enter between the outer narrow wall 75 and the central narrow wall 76, respectively, and the two contact blades 54a and 54b respectively connect the outer narrow wall 75 and the central narrow wall. It is pinched by the wall 76. For this reason, the arc generated between the electrodes 51 and 54 is further extended while the gap is extinguished. At this time, since each grid 78 and the movable electrode 54 rotate in directions opposite to each other, the arc path, that is, the arc extension distance is further extended.
[0056]
As shown in FIG. 13, when the movable electrode 54 moves to the open position, the arc is completely extinguished, and the opening operation ends. After the completion of the opening operation, the arc path is extended to such an extent that the insulation distance between the electrodes 51 and 54 is sufficiently ensured. Further, the side wall 71a of the first housing portion 71 and the side wall 72a of the second housing portion 72 each function as an in-phase insulating barrier, so that the dielectric strength between the electrodes 51 and 54 is improved, and the distance between the electrodes 51 and 54 is improved. Can be shortened.
[0057]
(Effects of the embodiment)
Therefore, according to the present embodiment, the following effects can be obtained.
A plurality of grids 78 are fixed to the movable arc extinguishing chamber 61 so as to be integrally rotatable. Each grid 78 is fixed at predetermined intervals along the moving direction of the movable electrode 54. Therefore, when the circuit is opened, the arc is stretched while the grid is extinguished, and the narrow gap is extinguished. Therefore, the arc extinguishing performance can be improved.
[0058]
In addition, when the movable arc extinguishing chamber 61 rotates when the circuit is opened, the side wall 71a of the first housing 71 and the second housing 72a enter between the electrodes 51 and 54, respectively. The side walls 71a and 72a each function as an in-phase insulating barrier. For this reason, a sufficient insulation distance can be ensured although the distance between the electrodes 51 and 54 can be reduced. Therefore, the arc extinguishing performance and, consequently, the breaking performance of the switch 11 can be improved while suppressing an increase in the size of the arc extinguishing device.
[0059]
(Another example)
The above embodiment may be modified as follows.
In the first and second embodiments, the movable electrode 20 is constituted by one contact blade, but may be constituted by a pair of contact blades arranged in parallel.
[0060]
In the third embodiment, the inner peripheral edge of the notch 78 a of the grid 78 and the outer surfaces of both side walls of the first housing 71 may be brought into close contact with each other. Even in this case, each grid moves integrally with the movable arc extinguishing chamber 61.
[0061]
-In 1st and 2nd embodiment, you may make it change the number of grids 31 arbitrarily. For example, one, two, four, five or more grids 31 are stacked.
[0062]
In the second and third embodiments, each grid 31 and 78 constitutes the arc inducing means, but may be replaced by another member as long as it can attract the arc.
[0063]
(Note)
Next, technical ideas that can be grasped from the embodiment and other examples will be additionally described below.
An arc extinguishing chamber is provided so as to cover the fixed electrode, and the respective grids are configured and arranged such that the arc extinguishing chamber is located within the notch of each grid, with the movement of the movable electrode in the opening direction. 2. The arc extinguishing device according to claim 1, wherein each grid is configured to move integrally along an outer surface of the arc extinguishing chamber. According to this configuration, in addition to the operation of the arc extinguishing device according to claim 1, each grid is integrally formed along the outer surface of the narrow arc extinguishing chamber with the movement of the movable electrode in the opening direction. Go to The arc generated between the electrodes in the arc-extinguishing chamber is drawn to the inner side of the notch of each grid by the action of the magnetic field generated in each grid, so as to follow the inner wall surface of the inner side of the notch of the grid in the arc-extinguishing chamber. The arc is extinguished while being stretched.
[0064]
An arc extinguishing chamber configured to be movable in a direction including a stretching direction component of the arc and moved so as to synchronously follow an arc stretched with the movement of the movable electrode in an opening direction; 2. The arc extinguishing device according to claim 1, wherein each grid is fixed to the arc extinguishing chamber so as to be integrally movable. According to this configuration, in addition to the operation of the arc extinguishing device according to the first aspect, the arc extinguishing chamber is configured so that the arc extinguishing chamber follows the arc elongated in accordance with the movement of the movable electrode in the opening direction. Move in the direction that includes the stretching direction component. Each grid moves integrally with the arc extinguishing chamber. For this reason, the arc generated between the two electrodes is wrapped in the arc-extinguishing chamber while being driven to the deep side of the notch of each grid.
[0065]
A pair of bushings penetrated and supported on both side walls of the main body case so as to face each other, a fixed electrode provided at the inner end of one bushing, and a rotatable provided at the inner end of the other bushing 7. A movable electrode corresponding to the fixed electrode so as to be able to approach and separate from the fixed electrode, and an arc provided at an inner end of the one bushing and extinguishing an arc generated between the two electrodes at the time of opening the circuit. A switch comprising the arc extinguishing device according to claim 1.
[0066]
【The invention's effect】
According to the present invention, the breaking performance can be improved while suppressing an increase in the size of the arc extinguishing device.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a switch according to a first embodiment.
FIG. 2 is a front cross-sectional view of the arc extinguishing device when the circuit is closed according to the first embodiment.
FIG. 3 is a front sectional view of the arc extinguishing device in the middle of opening in the first embodiment.
FIG. 4 is a front cross-sectional view of the arc extinguishing device when the circuit is opened according to the first embodiment;
FIG. 5 is a view taken along line 1-1 in FIG. 2;
FIG. 6 is a plan view of a grid according to the first embodiment.
FIG. 7 is a front sectional view of the arc extinguishing device at the time of closing a circuit according to the second embodiment.
FIG. 8 is a front sectional view of the arc extinguishing device in the middle of an open circuit in the second embodiment.
FIG. 9 is a front sectional view of the arc extinguishing device at the time of opening in the second embodiment.
FIG. 10 is a view taken along line 2-2 in FIG. 7;
FIG. 11 is a front sectional view of an arc extinguishing device at the time of closing a circuit according to a third embodiment.
FIG. 12 is a front cross-sectional view of an arc extinguishing device in the middle of an open circuit in a third embodiment.
FIG. 13 is a front cross-sectional view of the arc extinguishing device at the time of opening in the third embodiment.
FIG. 14 is a perspective view of a movable arc-extinguishing chamber according to a third embodiment.
FIG. 15 is a perspective view of a movable arc-extinguishing chamber according to a third embodiment.
FIG. 16 is a view taken along line 3-3 in FIG. 11;
[Explanation of symbols]
Reference numeral 11: switch, 16, 51: fixed electrode, 20, 54: movable electrode, 30: grid type arc extinguishing device, 31, 78: grid constituting arc attraction means, 33, 78a: cutout portion, 40: slit Arc extinguishing chamber (arc extinguishing chamber), 61 ... movable arc extinguishing chamber (arc extinguishing chamber).

Claims (5)

An arc generated between the two electrodes by laminating a plurality of grids having notches that can pass through the movable electrodes at predetermined intervals and sequentially passing the movable electrodes separated from the fixed electrode around the center of the notch of each grid. In the arc extinguishing device that extrudes and breaks and extinguishes,
Each of the grids is configured to be operable to move in a direction including a stretching direction component of the arc, and each grid is integrally moved so as to synchronously follow an arc that is stretched along with the movement of the movable electrode in the opening direction. An arc extinguishing device configured to cause the arc to extinguish. At the time of opening, an arc extinguishing device that extinguishes an arc generated between the fixed electrode and the movable electrode in an arc extinguishing chamber fixed to the fixed electrode side.
An arc inducing means for attracting the arc is provided outside the arc extinguishing chamber, and the arc inducing means is configured to be operable to move in a direction including an extending direction component of the arc, with the movement of the movable electrode in the opening direction. An arc extinguishing device configured to move an arc inducing means so as to synchronously follow an extended arc. At the time of opening, an arc extinguishing device that extinguishes an arc generated between the fixed electrode and the movable electrode in an arc extinguishing chamber provided on the fixed electrode side.
The arc-extinguishing chamber is configured to be operable to move in a direction including the arc-extending direction component, and the arc-extinguishing chamber is moved so as to follow the arc being extended in synchronization with the arc-extinguishing chamber. An arc extinguishing device provided with an arc attracting means for attracting. The arc attraction means includes a plurality of grids each having a cutout portion in which the arc extinguishing chamber can be arranged, and an arc extinguishing chamber is arranged in the notch portion of each grid, and the movable electrode is moved in an open circuit direction. 3. The arc extinguishing apparatus according to claim 2, wherein each grid is configured to move integrally with the outer surface of the arc extinguishing chamber. The arc extinguishing device according to claim 3, wherein the arc attraction means is a plurality of grids fixed so as to be integrally rotatable with respect to the arc extinguishing chamber.

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