JP2001195958A - Switch and device and method of extinction of arc by the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch and device and method of extinction of arc by the same which can shorten a distance between a fixed electrode and a movable electrode. SOLUTION: An extinction of arc chamber 32 is pivotally mounted in relation to a busing of power, and also is constituted to move synchronously with an arc generated between two electrodes 15, 18 in opening. Also, a guided member 52, which enters into an arc generation portion accordingly to the synchronized movement to make larger an extended distance of the arc, is provided at the movable extinction of arc chamber 32. Therefore, when opened, the guided member 52 enters between the electrodes 15, 18 to intercept the arc and functions as an insulation barrier between same phases. Accordingly, anti- insulation between the electrodes 15, 18 can be increased and the distance between the electrodes 15, 18 can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch for extinguishing an arc generated between electrodes when opened, an arc extinguishing device and an arc extinguishing method.

[0002]

2. Description of the Related Art As shown in FIG. 16, bushings 9 opposed to each phase are provided on both side walls of a main body case 92 of a switch 91.
3, 94 are supported through. One bushing 93
A fixed electrode 95 is provided on the inner end of the bushing 94, and a movable electrode 96 is provided on the other bushing 94 so as to be rotatable about a shaft 97. An arc-extinguishing member 98 extends downward from the fixed electrode 95 so as to cover the fixed electrode 95. The movable electrode 9
Numeral 6 can be inserted into the arc-extinguishing chamber 98b through an insertion opening 98a formed at the lower end of the arc-extinguishing member 98. An opening / closing shaft 99 is rotatably supported at an upper portion in the main body case 92. The opening / closing shaft 99 is connected to the movable electrode 96 of each phase via a lever 100 and a link 101. One end of the opening / closing shaft 99 is connected to an opening / closing mechanism (not shown) composed of a plurality of links and the like.
00 and the fixed electrode 95 via the link 101. When the switch 91 is opened, the fixed electrode 9
The arc generated between the distal end of the movable electrode 96 and the distal end of the movable electrode 96 is extinguished by the arc-extinguishing gas generated by being confined in the arc extinguishing chamber 98b of the arc extinguishing member 98 and the slit effect.

[0003]

However, at the time of opening, it is necessary to provide a certain distance or more between the fixed electrode 95 and the movable electrode 96 in order to maintain the insulation between the electrodes 95 and 96. there were. Therefore, both electrodes 95, 9
There is a limit in reducing the insulation distance between the switches 6, and there is a problem that it is difficult to reduce the size of the switch 91 in the in-phase direction.

The present invention has been made to solve the above problems, and has as its object to provide a switch capable of shortening the insulation distance between a fixed electrode and a movable electrode, an arc extinguishing device therefor, and a switch. An object of the present invention is to provide an arc extinguishing method.

[0005]

According to a first aspect of the present invention, there is provided a switch for extinguishing an arc generated between a fixed electrode and a movable electrode when the movable electrode is separated from the fixed electrode in the arc extinguishing chamber. In the arc method, the arc-extinguishing chamber is configured to be operable to move in a direction including an arc extending direction component,
The gist of the invention is to extinguish the arc by moving the arc extinguishing chamber so as to follow the extension of the arc synchronously.

According to a second aspect of the present invention, in the first aspect of the present invention, the movement accompanying the opening operation of the arc extinguishing chamber is:
The gist of the invention is to interrupt the arc generated between the fixed electrode and the movable electrode when the circuit is opened by the interruption promoting means provided at a part thereof.

According to a third aspect of the present invention, there is provided a pair of bushings penetratingly supported on both side walls of the main body case so as to face each other, a fixed electrode provided at an inner end of one bushing, and the other. A movable electrode that is rotatably provided at the inner end of the bushing and that is capable of moving toward and away from the fixed electrode; and a movable electrode that is provided at the inner end of the one bushing so as to cover the fixed electrode. When the electrodes are separated,
A switch provided with an arc-extinguishing chamber for extinguishing an arc generated between the two electrodes, wherein the arc-extinguishing chamber is rotatably provided with respect to one of the bushings, and the arc generated between the two electrodes at the time of opening the circuit. The gist of the invention is that the arc-extinguishing chamber is provided with a partition wall member which is configured to follow the synchronous follow-up movement and to enter an arc generating site with the synchronous follow-up movement to increase a stretching distance of the arc.

According to a fourth aspect of the present invention, there is provided a pair of bushings penetratingly 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 the other. A movable electrode that is rotatably provided at the inner end of the bushing and that is capable of moving toward and away from the fixed electrode, and an opening and closing mechanism that transmits an opening and closing operation to the movable electrode in conjunction with an external operation. Provided in a switch provided with a switch, wherein when the movable electrode is separated from the fixed electrode, an arc extinguishing device for extinguishing an arc generated between the two electrodes, wherein the arc extinguishing device has one bushing. An arc extinguishing chamber provided rotatably about an axis provided, an arc generated between the two electrodes when the arc of the arc extinguishing chamber and the movable locus of the movable electrode are shared when the circuit is opened. It is important that the To.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the arc extinguishing chamber is operatively connected to the opening / closing mechanism and is rotatable in conjunction with an external operation. The gist of the invention is that, when the circuit is opened, it is configured to move in a direction substantially coincident with a direction in which the arc generated between the two electrodes is elongated.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the arc-extinguishing chamber or the arc-extinguishing chamber is rotatably pivoted toward the fixed electrode. A shaft attachment portion to be attached, an arc-extinguishing portion for extinguishing the movable electrode in a narrow gap, and a partition member for extending the arc by entering the arc generating portion along with movement at the time of opening, and are integrally formed. It is the gist of that.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the arc extinguishing chamber moves along with the movement of the arc extinguishing chamber, The gist of the present invention is to provide a blowing member for extruding air in the arc-extinguishing chamber so as to blow against an arc generated between the fixed electrode and the movable electrode when the circuit is opened.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the movable electrode linearly moves. According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, a portion facing a trajectory of the movable electrode in the arc-extinguishing chamber at the time of opening and closing operation includes a movable electrode. The gist of the present invention is to provide a creeping distance increasing means for increasing the creeping distance between the fixed electrode and the fixed electrode.

According to a tenth aspect of the present invention, in the ninth aspect of the present invention, the creepage distance increasing means includes:
The gist of the invention is to provide a continuous adhesion preventing means for preventing a product generated with the arc from continuously adhering to the inner surface of the arc-extinguishing chamber.

According to an eleventh aspect of the present invention, in the ninth aspect of the present invention, the creepage distance increasing means includes a plurality of grooves formed so as to extend in a direction intersecting the movement locus of the movable electrode. The gist is that there is. (Operation) Therefore, according to the first aspect of the present invention, the arc extinguishing chamber moves in a direction including the extension direction component of the arc so as to follow the arc in synchronization with the extension. That is, the arc extinguishing chamber moves so as to surround the arc.

According to the second aspect of the present invention, in addition to the operation of the first aspect, the opening movement of the arc extinguishing chamber promotes the interruption of the arc path, so that the arc extinguishing ability is improved. .

According to the third aspect of the present invention, the arc extinguishing chamber moves so as to synchronously follow an arc generated between the two electrodes when the circuit is opened. Also, with the synchronous following movement of the arc extinguishing chamber,
The partition member enters the arc generating site. For this reason, the arc stretching distance increases.

According to the fourth aspect of the present invention, the arc-extinguishing chamber is rotated about an axis provided in one of the bushings, and a common part of a moving locus of the arc-extinguishing chamber and a moving locus of the movable electrode is formed. , Which are portions where the arc generated between the two electrodes when the circuit is opened is extended.

According to a fifth aspect of the present invention, in addition to the effect of the fourth aspect of the invention, when the circuit is opened, the arc extinguishing chamber is extended with an arc generated between the two electrodes in conjunction with an external operation. Move in a direction that almost matches the direction. For this reason,
The arc is enveloped by the arc-extinguishing chamber.

According to a sixth aspect of the present invention, in addition to the function of the first aspect of the present invention, the shaft attachment portion, the arc-extinguishing portion, and the partition member are integrally formed. Formed.

According to a seventh aspect of the present invention, in addition to the function of the first aspect of the present invention, the blowing member moves with the movement of the arc-extinguishing chamber. By this movement, the air in the arc extinguishing chamber is pushed out so as to blow against the arc generated between the fixed electrode and the movable electrode when the circuit is opened.

According to an eighth aspect of the present invention, in addition to the function of the first aspect of the present invention, the movable electrode moves linearly. According to the ninth aspect of the present invention, in addition to the effect of the first aspect of the present invention, the creepage distance between the movable electrode and the fixed electrode increases, and The withstand voltage between them is improved.

According to the tenth aspect of the present invention, in addition to the function of the ninth aspect, it is possible to prevent a product generated together with the arc from being continuously adhered to the inner surface of the arc-extinguishing chamber when the circuit is opened. Is done. For this reason, the decrease in insulation resistance on the creeping surface due to the adhesion of the product to the inner surface of the arc-extinguishing chamber is reduced.
According to the eleventh aspect, in addition to the function of the ninth aspect, a plurality of grooves are provided on the inner surface of the arc-extinguishing chamber in a direction intersecting the movement locus of the movable electrode. The creepage distance between the electrode and the fixed electrode increases. For this reason, the withstand voltage between both electrodes is improved despite the simple configuration.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in an air switch will be described below with reference to FIGS. (Overall Switch) As shown in FIG. 1 and FIG.
A power supply-side bushing 13 and a load-side bushing 14 are supported through the opposite side walls of the body case 12 so as to face each other for each of the three phases (only one phase is shown in FIG. 1). . A rod-shaped fixed electrode 15 protrudes from the inner end of the power supply side bushing 13. A conductive rod 16 projects from an inner end of the load-side bushing 14, and a base end of a movable electrode 18 is rotatably supported on the conductive rod 16 via a shaft 17. The movable electrode 18 includes a pair of contact blades 18a and 18b arranged in parallel.

On the other hand, in the upper part of the main body case 12,
A rotation shaft 19 operatively connected to an operation handle (not shown) outside the main body case 12 is provided through a link mechanism (not shown) including a plurality of links and the like.
A lever 20 is fixed to 9 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 connected to the movable electrode 1.
8 is rotatably connected to the vicinity of the center. One end of an operation link 22 is rotatably connected to the tip of the lever 20.

Therefore, when the operation handle is operated, the movable electrode 18 is connected to the link mechanism, the rotating shaft 19, and the lever 2
1 and an open position B shown by a two-dot chain line in FIG.
To move between. The link mechanism, the rotation shaft 19,
The lever 20 and the drive link 21 constitute an opening / closing mechanism 23.

Below the power supply side bushing 13 on the inner side wall of the body case 12, a ground-to-ground barrier V having an L-shaped cross section is fixed via a plurality of support members K. The ground-to-ground barrier V is formed of an insulating synthetic resin such as polytetrafluoroethylene, nylon, and polypropylene, and extends along the inner wall of the main body case 12 from the lower portion of the power supply side bushing 13 to the vicinity of the center of the main body case 12. So that it extends. (Arc Extinguishing Member) An arc extinguishing device 30 is provided at the inner end of the power supply side bushing 13 so as to cover the fixed electrode 15. The arc extinguishing device 30 includes a support base 31 fixed to the inner end of the power supply side bushing 13 and a movable arc extinguishing chamber 32 as an arc extinguishing chamber rotatably supported by the support base 31. I have. The support table 31 and the movable arc extinguishing chamber 32 are integrally formed of an insulating and arc extinguishing synthetic resin such as polyacetal, polytetrafluoroethylene, melamine, urea, and nylon.

(Support Table) As shown in FIGS. 2 and 3, the support table 31 has a cylindrical insertion portion 33 into which the inner end of the power supply side bushing 13 is inserted. A pair of shafts 34 project from the outer periphery of the insertion portion 33 on the bushing insertion side so as to be located on opposite sides. A rectangular plate-shaped regulating member 35 is provided on the side opposite to the bushing insertion side of the insertion portion 33, and an insertion hole 36 through which the fixed electrode 15 can be inserted is formed in the center of the regulating member 35.

On the front surface of the regulating member 35 on the load side bushing 14 side, a rectangular tubular insertion guide member 37 is projected around the insertion hole 36, and the insertion guide member 37 is provided.
Notches 38 are formed in a pair of side walls facing each other. At the center of the lower side wall of the insertion guide member 37, a fan-shaped guide member 39 as a fixed insertion member is protruded. The arc portion of the guide member 39 faces the load side bushing 14 side. One straight portion of the guide member 39 extends in the axial direction of the insertion portion 33, and the other straight portion extends downward along the regulating member 35 so as to be orthogonal to the one straight portion.

As shown in FIG. 2, the inner end of the power supply side bushing 13 inserted into the insertion portion 33 is in contact with the regulating member 35, whereby the power supply side bushing 1
(3) Movement toward the outer end is restricted. The fixed electrode 15 passes through the insertion hole 36 and the insertion guide member 37 and protrudes toward the load side bushing 14. The support base 31 is fixed to the fixed electrode 15 by screwing a set screw (not shown) into a female screw portion 15 a formed on the outer periphery of the fixed electrode 15 via a notch 38.

(Movable Arc Extinguishing Chamber) As shown in FIGS. 4 and 7, the movable arc extinguishing chamber 32 includes a first accommodating portion 41 in which the inner end of the power supply side bushing 13 is located, and a first accommodating portion 41. And a second accommodating portion 42 protruding along the center of the outer periphery of the fixed electrode 15 and positioned at the tip end of the fixed electrode 15.
The insides of 42 communicate with each other. The side surface of the first housing portion 41 on the load side bushing 14 side is a first circular arc surface 41a having a predetermined radius of curvature. The side surface of the second housing portion 42 on the load side bushing 14 side is a second arc surface 42a having a predetermined radius of curvature.

(First Storage Unit) As shown in FIGS. 3 and 4, the first storage unit 41 has a pair of side walls 41 opposed to each other.
b, 41b. On both sides 41b, 41b, on the power supply side bushing 13 side, a semicircular shaft mounting portion 43 as a shaft mounting portion is provided so as to protrude.
4 are formed. An operating pin 45 is protrudingly provided near the center of each of the side walls 41b, 41b near the first circular surface 41a. As shown in FIG. 2, the other ends of the operation links 22 are rotatably connected to the operation pins 45, respectively.

(Second accommodation section) As shown in FIGS.
The second accommodating portion 42 includes a pair of side walls 51a, 5 opposing each other.
1a, and a guided member 52 as a partition member connecting the side walls 51a, 51a. Guided member 5
2 is a middle part of the side walls 51a on the base end side of the side walls 51a, that is, FIG.
At the position of the line XX in FIG. The outer surface of the guided member 52 is the second arc surface 42a, and the inner surface is the guided surface 42b. Both side walls 51a, 51a
Are formed on the base end side thereof with an outer narrow wall 53 protruding outward. At the base end side of the guided member 52, a center slit wall 54 as a sandwiching member is provided on both outer slit walls 53.
It is protruded so as to be located in the middle of. A narrow arc extinguishing portion 55 into which the movable electrode 18 can be inserted is formed from both outer narrow walls 53 and the center narrow wall 54.

The second accommodating portion 42 has the first arc surface 41a, the second arc surface 42a, and both side walls 51a, 51a.
And the closing wall 51b as a blowing member, the blowing chamber 42
c is formed, and an opening 42d of the blower chamber 42c is formed.
Is opposite to the direction of rotation of the movable electrode 18 during the opening operation as shown in FIGS. 8 and 9 (vertical direction in FIG. 8).
It is arranged to face. The guided member 5
2 and the closing wall 51b constitute an interruption promoting means for promoting interruption of an arc generated between the fixed electrode 15 and the movable electrode 18 when the circuit is opened.

As shown in FIG. 2, the distance between both outer slit walls 53 and the center slit wall 54 is the distance between the two contact blades 1 respectively.
The thickness is slightly larger than the thickness of 8a, 18b. Further, the support base 31 is inserted into the insertion hole 44 of the double shaft attaching portion 43.
The movable arc extinguishing chamber 32 is rotatable around the shaft 34. Accordingly, when the operation handle (not shown) is operated, the movable arc extinguishing chamber 32 is shown in FIG. 7 via the link mechanism (not shown), the rotating shaft 19, the lever 20, the operation link 22 and the operation pin 45. It moves between the loading corresponding position C and the opening corresponding position D shown in FIG.

The radius of curvature of the inner surface of the first accommodating portion 41, that is, the inner surface of the first circular arc surface 41a is determined by the movable arc extinction chamber 32.
When the is moved from the loading corresponding position C to the opening corresponding position D, the regulating member 35 does not contact the inner surface of the first housing portion 41. Also, the radius of curvature of the inner surface of the second housing portion 42, that is, the guided surface 42b is
When the movable arc-extinguishing chamber 32 moves from the closing corresponding position C to the opening corresponding position D, the tip of the fixed electrode 15 is positioned on the inner surface of the second housing portion 42. It does not touch. (Operation of Embodiment) Next, the operation of the switch 11 constructed as described above when the switch is opened will be described with reference to FIGS.

In the closed state shown in FIG. 7, when the operation handle (not shown) is opened, the lever 20 rotates leftward via the rotation shaft 19. Along with this, the drive link 21 is moved downward, and the movable electrode 18 turns left around the shaft 17. When the movable electrode 18 is separated from the fixed electrode 15, an arc is generated between the electrodes 15, 18.

On the other hand, with the left rotation of the lever 20,
The working link 22 is moved downward. Then, the movable arc extinguishing chamber 32 is moved downward through the operating pin 45, and the shaft 34 is moved.
Turn right around. That is, the movable arc-extinguishing chamber 32 follows the leftward rotation of the movable electrode 18 and moves in a direction including the arc extending direction component or in a direction substantially coincident with the arc extending direction. Then, as the movable electrode 18 rotates to the left, the support base 3 is placed between the contact blades 18a and 18b.
One guide member 39 relatively enters. Therefore, both contact blades 18a, 18b are sandwiched between both side walls 51a, 51a and both side walls of guide member 39, and both electrodes 15, 18 are provided.
The arc generated between them is elongated while the gap is extinguished.

As shown in FIG. 8, when the lever 20 is further rotated to the left, the movable arc-extinguishing chamber 32 is moved while the guided surface 42b of the guided member 52 is guided by the arc portion of the guide member 39. Turn right. Along with this, the guided member 52 causes the two electrodes 15, 18 to block the arc.
Into the gap, that is, into the arc generation site. In addition, both contact blades 1
The central gap wall 54 enters between the portions 8a and 18b in place of the guide member 39. For this reason, both contact blades 18
a and 18b are an outer slit wall 53 and a central slit wall 54, respectively.
The arc generated between the electrodes 15 and 18 is further elongated while the gap is extinguished, and extinguished.

Then, both contact blades 18a of the movable electrode 18
When each of the guide members 18b passes between the outer slit wall 53 and the center slit wall 54, the guided member 52
5 moves so as to block a straight line connecting the arc generating portion of the movable electrode 18 with the arc generating portion of the movable electrode 18. Therefore, FIG.
As shown by a chain line, the arc path is bent so as to bypass the guided member 52, and the arc path, that is, the arc extension distance is larger than that in the case of a straight line. The degree of bending of the arc path increases as the movable arc extinguishing chamber 32 rotates rightward.

When the movable electrode 18 moves to the open position B shown in FIG. 9, the arc is completely extinguished and the opening operation is completed. At this time, the arc path is bent so that the insulation distance between the electrodes 15 and 18 is sufficiently ensured as shown by a chain line in FIG. That is, after the completion of the opening, the guided member 5
2 functions as an in-phase insulation barrier, and both electrodes 15, 18
The dielectric strength between them is improved. For this reason, both electrodes 15, 18
The distance between them can be reduced.

When the circuit is opened, the movable arc-extinguishing chamber 3 is closed.
2 and the moving trajectory of the movable electrode 18 form a space for extinguishing the arc in a narrow space, and the movable arc quenching chamber 32
8, the inner surface of the narrow arc extinguishing portion 55 that is in contact with the arc is sequentially displaced from left to right in FIG. 8 to suppress partial wear.

Further, with the rotation of the movable arc-extinguishing chamber 32, the air in the blowing chamber 42c moves with the movable electrode 18 by the movement of the closing wall 51b of the blowing chamber 42c provided in the movable arc-extinguishing chamber 32. The arc is blown to the arc generated between the fixed electrode 15 and the arc, and the arc is extended toward the opening 42d side in the ventilation chamber 42c and diffused. Therefore, the arc extinguishing action at the narrow arc extinguishing portion 55 is promoted.

Further, a decomposition gas containing carbides and the like generated at the time of arc generation is quickly discharged from the inside of the movable arc extinguishing chamber 32 to the opposite direction to the movable electrode 18 through the opening 42d, and the inside of the movable arc extinguishing chamber 32 and This decomposed gas does not exist around the movable electrode 18. Although the decomposed gas is released in the direction of the inner wall of the main body case 12 on the power supply side bushing 13 side, the decomposed gas is blocked by the inter-ground barrier V and does not contact the inner wall of the main body case 12.

When the circuit is closed, a common part of the movement locus of the movable arc extinguishing chamber 32 and the movement locus of the movable electrode 18 becomes an arc extending space. When the circuit is closed, an operation reverse to that at the time of opening is performed.

Therefore, according to the present embodiment, the following effects can be obtained. (1) The movable arc extinguishing chamber 32 is configured to be movable in a direction including a component of a direction in which the arc is stretched so that the movable arc extinguishing chamber 32 follows the stretching of the arc synchronously. Therefore, the movable arc extinguishing chamber 3
2 moves so as to enclose the arc, and a movable arc extinguishing chamber 32 is interposed between the fixed electrode 15 and the movable electrode 18. Therefore, the arc can be efficiently confined in the movable arc extinguishing chamber 32. Further, the movable arc extinguishing chamber 32 is provided with both electrodes 15 and 18.
It functions as an insulating barrier between the electrodes, and can reduce the distance between the electrodes 15 and 18. As a result, the length of the switch 11 in the in-phase direction can be reduced.

(2) Since the blower chamber 42c is provided in the movable arc extinguishing chamber 32, the arc flows through the opening 42d in the blower chamber 42c.
Stretched to the side and spread. Therefore, the arc extinguishing ability can be enhanced by providing a further cooling effect. In addition, a decomposition gas containing carbides and the like generated at the time of arc generation is quickly discharged from the inside of the movable arc extinguishing chamber 32 through the opening 42d in the direction opposite to the movable electrode 18 and the movable arc extinguishing chamber 3
The reignition can be prevented by preventing the decomposition gas from being present inside 2 and around the movable electrode 18.

(3) When the movable arc extinguishing chamber 32 is opened, the guided arc enters the arc generating portion so as to block the arc generated between the two electrodes 15 and 18 as the movable arc extinguishing chamber 32 rotates. The member 52 was formed. Therefore, the arc path becomes longer due to the insulating barrier effect of the guided member 52. Therefore,
Although the distance between the electrodes 15 and 18 can be reduced despite the simple configuration, a sufficient insulation distance can be secured.

(4) The common part of the moving locus of the movable arc extinguishing chamber 32 and the moving locus of the movable electrode 18 is defined as a space for extending the arc generated between the electrodes 15 and 18 when the circuit is opened. Therefore, unlike the conventional case where the arc extinguishing chamber is fixed, it is not necessary to form the movable arc extinguishing chamber 32 along the rotation locus of the movable electrode 18. Therefore, the entire movable arc extinguishing chamber 32 can be reduced in size.

(5) Each part of the movable arc extinguishing chamber 32, that is, the shaft attaching portion 43, the arc extinguishing portion, and the guided member 52 are integrally formed of synthetic resin having an insulating property. For this reason, the movable arc extinguishing chamber 32 can be easily formed by injection molding or the like,
Manufacturing efficiency can be improved.

(6) The movable arc extinguishing chamber 32 has a central slit wall 54
Further, a guide member 39 is formed on the support base 31 so that the center gap wall 54 and the guide member 39 enter between the movable contact blades 18a and 18b when the circuit is opened. Therefore, the contact blades 18a and 18b are continuously sandwiched between the side walls and the outer narrow wall 53 of the guide member 39, and between the center narrow wall 54 and the outer narrow wall 53, respectively. Accordingly, the arc extinguishing ability of the movable arc extinguishing chamber 32 is improved, and the arc generated between the electrodes 15 and 18 is efficiently extinguished in the narrow gap. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.
And FIG. Note that the second embodiment differs from the first embodiment in that the movable electrode 18 is configured to be able to reciprocate linearly. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

As shown in FIG. 12, one end of a drive link 71 is connected to the rotating shaft 19 so as to be integrally rotatable. At the other end of the drive link 71, a first elongated hole 72 is formed along the axis of the drive link 71. The first elongated hole 72 has a connecting shaft 7 for connecting the contact blades 18a and 18b.
3 is inserted. The connection shaft 73 is movable between the upper end and the lower end of the first elongated hole 72 relative to the drive link 71.

The contact blades 18a, 18 of the movable electrode 18
A straight second elongated hole 74 is formed at the base end of b. The shaft 17 is inserted through the second elongated hole 74, and the coaxial 17 extends between the right end and the left end of the second elongated hole 74 with the two contact blades 1.
It is relatively movable with respect to 8a and 18b.
The movable arc-extinguishing chamber 32 is provided with the guided member 52 during the opening operation.
And the movable electrode 18 do not interfere with each other.

In the closed state shown in FIG. 10, when the operation handle (not shown) is opened, the drive link 71 turns left around the turning shaft 19. Then, the connecting shaft 73 moves from the upper end to the lower end of the first elongated hole 72 to the drive link 7.
1 and to the right in FIG. As a result, the contact blades 18a and 18b also move rightward in FIG. 10, and accordingly, the shaft 17 moves from the right end to the left end of the second elongated hole 74 relative to the contact blades 18a and 18b. . The movable electrode 18 is the fixed electrode 15
When the electrodes are separated from each other, an arc is generated between the electrodes 15 and 18.

On the other hand, as in the first embodiment, the movable arc-extinguishing chamber 32 follows the rightward movement of the movable electrode 18 in response to the opening operation of the operation handle.
It turns right around the shaft 34 so as to enter between. The arc generated between the electrodes 15 and 18 is extinguished when passing between the outer slit wall 53 and the center slit wall 54. Then, when the movable electrode 18 moves to the open position B shown in FIG. 11, the opening operation ends.

At this time, as shown in FIG.
3 is engaged with the lower end of the first elongated hole 72, and the shaft 17 is engaged with the left end of the second elongated hole 74. The movable arc-extinguishing chamber 32 is located at the opening corresponding position D shown in FIG. 13, and the guided member 52 of the movable arc-extinguishing chamber 32 includes the fixed electrode 15 and the movable electrode 1.
8 interposed. Therefore, the guided member 52
, The dielectric strength between the electrodes 15 and 18 is improved.

Therefore, according to the present embodiment, the first
As in the embodiment, in the open state, the two electrodes 15, 1
The guided member 52 of the movable arc extinguishing chamber 32 is located between the positions 8. Therefore, the dielectric strength between the electrodes 15 and 18 is improved by the barrier effect of the guided member 52. Therefore, even in the switch 11 in which the moving trajectory of the movable electrode 18 is linear, the distance between the electrodes 15 and 18 can be reduced. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The third embodiment is different from the first embodiment in that the movable electrode 18 is constituted by a single contact blade. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

As shown in FIGS. 12 and 13, the movable electrode 18 is composed of a single movable contact blade 81, and the movable contact blade 81 is rotatably supported on the shaft 17. The conductive rod 8 is provided at the inner end of the power supply side bushing 13.
2, and a fixed electrode 83 is fixed to the conductive rod 82. The fixed electrode 83 includes a pair of fixed contact blades 83.
a, 83b, both fixed contact blades 83a,
The movable contact blade 81 can be pinched by 83b.

As shown in FIG. 14, the power supply side bushing 1
A pair of outer slit walls 84 are formed on the load side bushing 14 side of the movable arc extinguishing chamber 32 provided at the inner end of the movable arc blade 32. It is slightly larger than the thickness. As shown in FIG. 15, a pair of fan-shaped guide members 85 protrude below the insertion guide member 37 in the support base 31 fixed to the inner end of the power supply side bushing 13. The distance between the two guide members 85 is slightly larger than the thickness of the movable contact blade 81. The movable contact blade 81 can pass between the outer gap walls 84 and between the guide members 85.

Therefore, according to the present embodiment, the first
As in the embodiment, in the open state, both electrodes 83, 1
The guided member 52 of the movable arc extinguishing chamber 32 is located between the positions 8. Therefore, the dielectric strength between the electrodes 83 and 18 is improved by the barrier effect of the guided member 52. Therefore, even in the switch 11 including the movable electrode composed of the single movable contact blade 81 and the fixed electrode 83 composed of the pair of fixed contact blades 82a and 82b, the distance between the two electrodes 83 and 18 is obtained. And the length of the switch 11 in the in-phase direction can be shortened. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.
And FIG.

As shown in FIGS. 16 and 17, on the inner surface of the movable arc extinguishing chamber 32 and on both side surfaces of the guide member 39, a plurality of grooves 88, 89 are respectively orthogonal or intersecting with the moving trajectory of the movable electrode 18. And are formed so as to extend in parallel.
That is, the inner surface of the movable arc extinguishing chamber 32 (the first and second accommodation portions 41,
42, the inner surfaces of both outer slit walls 53, 53, the surfaces of the central slit wall 54 facing the outer slit walls 53, 53, and the side surface of the fixed electrode 15 of the central slit wall 54). Each groove 88 is formed so as to be parallel to the closing wall 51b. Further, on both side surfaces of the guide member 39, each groove 89 is formed so as to be orthogonal to the regulating member 35, respectively. Each of the grooves 8
Numerals 8 and 89 constitute a creeping distance increasing means for increasing the creeping distance between the electrodes 18 and 15 and a continuous adhesion preventing means for preventing the product from continuously adhering to the inner surface of the arc-extinguishing chamber 32.

At the time of opening, gaseous products such as arc-extinguishing gas, carbide and metal vapor are generated by the heat of the arc generated between the electrodes 15 and 18. This product is formed on the inner surface of the movable arc-extinguishing chamber 32, both side surfaces of the guide member 39, and the grooves 88,8.
9 is attached along the rotation locus of the movable electrode 18. That is, since the products are dispersed and adhered in the grooves 88 and 89, the products are not continuously adhered to the inner surface of the movable arc extinguishing chamber 32 and both side surfaces of the guide member 39, and the continuous soiled surface is prevented. Is not formed.

The inner surface of the movable arc extinguishing chamber 32 and the guide member 39
The decrease in the insulation resistance at the creeping surface due to the adhesion of the product to both side surfaces of the semiconductor device is compensated for by increasing the creeping distance by the grooves 88 and 89. Then, even if the movable electrode 18 is opened while the inner surface of the movable arc extinguishing chamber 32 and both side surfaces of the guide member 39 are contaminated with the product, the movable arc extinguishing chamber 32 is opened.
Of the two electrodes 1 via the inner surface of the
There is no energization between 5 and 18. That is, the insulation performance between the same phases in the switch 11 is improved. Therefore, according to the present embodiment, the inner surface of the movable arc extinguishing chamber 32 and the guide member 39 are provided.
, The dielectric strength of both side surfaces is maintained, and the withstand voltage characteristics can be favorably maintained for a long period of time.

The above embodiments may be modified and implemented as follows. The guide member 3 in the second and third embodiments.
9, 85 may be omitted. Even in this case, the movable electrode 18 is sandwiched between the outer narrow wall 53 and the central narrow wall 54, and the arc generated between the electrodes 15, 18 can be extinguished in the narrow gap.

Next, technical ideas other than the claimed invention which can be grasped from the embodiment will be described below together with their effects. The fixed electrode (15) is rod-shaped, and the movable electrode (1
8) is constituted by a pair of plate-shaped movable contact blades (18a, 18b), and both movable contact blades (18a, 18b) are arranged so as to be squeezable with respect to the fixed electrode (15). When the circuit is open, both movable contacts (18a, 1
The arc extinguishing device for a switch according to any one of claims 1 to 6, further comprising a sandwiching member (54) that enters the gap and extinguishes the arc with a narrow gap. Even in this case, the arc extinguishing ability can be improved.

The fixed sandwiching member (39) which cooperates with the sandwiching member (54) to enter between the two movable contact blades (18a, 18b) at the time of opening the circuit and extinguish the arc with a fixed electrode. The arc extinguishing device for a switch according to claim 7, which is provided on the (15) side. Even in this case, the arc extinguishing ability can be improved.

[0066]

Therefore, according to the first aspect of the present invention, the arc extinguishing chamber is interposed between the fixed electrode and the movable electrode, and the flashing distance between the two electrodes is increased. The distance between them can be reduced.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), the opening movement of the arc extinguishing chamber promotes the interruption of the arc path, thereby improving the arc extinguishing ability.

According to the third aspect of the present invention, since the partition member is provided, the distance between the two electrodes can be further reduced. According to the invention described in any one of claims 3 to 5, the distance between the two electrodes can be reduced by the configuration in which the arc-extinguishing chamber is rotatably provided.

According to the invention of claim 6, according to claim 1,
In addition to the effects of the invention described in any one of claims 5 to 5, the arc extinguishing chamber has an integral and simple structure. According to the invention described in claim 7, in addition to the effect of the invention described in any one of claims 1 to 6, the arc extinguishing ability can be improved.

According to the invention of claim 8, according to claim 1,
Another configuration that achieves the same effect as the effect of the invention described in any one of claims 3 to 3 can be provided. According to the ninth aspect of the present invention, in addition to the effect of the first aspect of the present invention, the insulation strength is maintained by increasing the creeping distance between the two electrodes. In addition, it is possible to maintain good withstand voltage characteristics for a long time.

According to the tenth aspect of the present invention, in addition to the effect of the ninth aspect of the present invention, the product produced by the generation of the arc continuously adheres to the inner surface of the arc-extinguishing chamber. Therefore, it is possible to alleviate a decrease in insulation resistance on the surface.

According to the eleventh aspect, in addition to the effects of the ninth aspect, the withstand voltage between the two electrodes can be improved despite the simple configuration.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a switch according to an embodiment.

FIG. 2 is a plan view of a main part of the switch in the embodiment.

FIG. 3 is a perspective view showing the mounting of the movable arc extinguishing member in the embodiment.

FIG. 4 is a perspective view of a movable arc extinguishing member according to the embodiment.

FIG. 5 is a perspective view of a movable arc extinguishing member according to the embodiment.

FIG. 6 is a right side view of the movable arc extinguishing member according to the embodiment.

FIG. 7 is a front view of a main part of the switch in the embodiment.

FIG. 8 is a front view of a main part of the switch according to the embodiment.

FIG. 9 is a front view of a main part of the switch in the embodiment.

FIG. 10 is a front view of a main part of a switch in another embodiment.

FIG. 11 is a front view of a main part of a switch in another embodiment.

FIG. 12 is a front view of a main part of a switch in another embodiment.

FIG. 13 is a sectional side view of a main part of an electrode unit according to another embodiment.

FIG. 14 is a side view of a movable arc extinguishing member according to another embodiment.

FIG. 15 is a side view of a support according to another embodiment.

FIG. 16 is a perspective view of a movable arc extinguishing member according to another embodiment.

FIG. 17 is a front view of a main part of a switch in another embodiment.

FIG. 18 is a front sectional view of a conventional switch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Switch, 12 ... Body case, 13 ... Power supply side bushing, 14 ... Load side bushing, 15 ... Fixed electrode, 18
... movable electrode, 18a, 18b, 81 ... movable contact blade, 20
... Lever, 21 ... Drive link, 22 ... Operation link, 23
... Opening / closing mechanism part, 30 ... Arc extinguishing member, 31 ... Support base, 32 ...
Movable arc-extinguishing chamber (arc-extinguishing chamber), 34: shaft, 39, 85: guide member (fixed sandwiching member), 43: shaft attaching portion, 52: guided member (partition member), 53, 84: outside slit Wall, 54: Central slit wall (sandwich member), 55: Arc extinguishing part, 83a, 83
b: fixed contact blades, 88, 89: grooves forming creeping distance increasing means and continuous adhesion preventing means.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Moto Ito, Inayama-shi, Aichi Prefecture, 1st small needle, Energy Support Co., Ltd. (72) Inventor Tsuyoshi Suzuki 2-56, Suda-cho, Mizuho-ku, Nagoya Japan F term (reference) 5G001 AA08 BB02 CC03 DD03 EE03 GG06 5G027 AA03 AA08 BC02 5G028 AA08 AA22 EB12

Claims (11)

[Claims] 1. A fixed electrode (15) to a movable electrode (18).
The arc extinguishing method of the switch (11) for extinguishing the arc generated between the two electrodes (15, 18) and extended in the arc extinguishing chamber (32) comprises the steps of: The arc extinguishing method of a switch, wherein the arc extinguishing chamber (32) is configured to be operable to move in a direction including an arc extending direction component and the arc extinguishing chamber (32) is moved so as to follow the arc being extended synchronously. 2. A movement accompanying the opening operation of the arc-extinguishing chamber (32) is generated between the fixed electrode (15) and the movable electrode (18) at the time of opening by a cut-off promoting means provided in a part thereof. 2. The arc extinguishing method for a switch according to claim 1, wherein the arc breaking is promoted. 3. A pair of bushings (1) penetratingly supported on both side walls of the main body case (12) so as to face each other in each phase.
3, 14); a fixed electrode (15) provided at the inner end of one bushing (13); and a rotatable provided at the inner end of the other bushing (14). A movable electrode (18) corresponding to the movable electrode and a fixed electrode (1) at an inner end of the one bushing (13);
5) so as to cover the two electrodes (15, 18) when the movable electrode (18) is separated from the fixed electrode (15).
A switch (11) having an arc extinguishing chamber (32) for extinguishing an arc generated therebetween, wherein the arc extinguishing chamber (32) is provided rotatably with respect to one bushing (13); When the circuit is open, both electrodes (15, 1
8) Synchronously follow the arc that occurs during
In addition, a switch provided with a partition member (52) in the arc extinguishing chamber (32), which enters an arc generating part along with the synchronous follow-up movement to increase an arc extending distance. 4. A pair of bushings (1) penetratingly supported on both side walls of the main body case (12) so as to face each other in each phase.
3, 14); a fixed electrode (15) provided at the inner end of one bushing (13); and a rotatable provided at the inner end of the other bushing (14). A switch (1) including a movable electrode (18) corresponding to the movable electrode (18), and an opening / closing mechanism (23) for transmitting an opening / closing operation to the movable electrode (18) in conjunction with an external operation.
An arc extinguisher (1) provided in the switch (11) for extinguishing an arc generated between the electrodes (15, 18) when the movable electrode (18) is separated from the fixed electrode (15). 30) In the arc extinguishing device (30), one bushing (13) is provided.
And an arc-extinguishing chamber (32) rotatably provided about a shaft (34) provided in the movable electrode (18). When the circuit is open, both electrodes (1
An arc extinguishing device for a switch, which serves as a portion where an arc generated between 5, 18) is stretched. 5. The arc extinguishing chamber (32) is operatively connected to the opening / closing mechanism (23) and is configured to be rotatable in conjunction with an external operation.
8) The arc extinguishing device for a switch according to claim 4, wherein the arc extinguishing device is configured to move in a direction substantially coincident with a stretching direction of an arc generated therebetween. 6. The arc extinguishing chamber (32) includes a fixed electrode (1).
5) A shaft-attached portion (43) that is pivotally attached to the side, an arc-extinguishing portion (55) that extinguishes the movable electrode (18) in a narrow gap, and enters an arc-generating portion with movement during opening. The arc extinguishing device for a switch according to any one of claims 1 to 5, further comprising a partition member (52) for extending the arc by means of an arc. 7. The arc-extinguishing chamber (3) is provided in the arc-extinguishing chamber (32).
It moves along with the movement of 2), and by this movement, the air in the arc extinguishing chamber (32) is blown against the arc generated between the fixed electrode (15) and the movable electrode (18) when the circuit is opened. 2. A blower member (51b) for extruding air to the airbag.
The arc extinguishing device according to any one of claims 6 to 6. 8. The switch or arc extinguishing method according to claim 1, wherein the movable electrode (18) moves linearly. 9. A creeping distance between the movable electrode (18) and the fixed electrode (15) is increased in a portion of the arc-extinguishing chamber (32) facing a trajectory when the movable electrode (18) is opened and closed. The switch, arc extinguishing device, and arc extinguishing method according to any one of claims 1 to 8, further comprising a creepage distance increasing means for causing the creepage distance to increase. 10. The continuous creeping distance increasing means is a continuous adhesion preventing means for preventing a product generated together with an arc from continuously adhering to the inner surface of the arc extinguishing chamber (32) when the circuit is opened. The switch, the arc extinguishing device and the arc extinguishing method according to the above. 11. The switch according to claim 9, wherein the creepage distance increasing means is a plurality of grooves (88) formed so as to extend in a direction intersecting the movement trajectory of the movable electrode (18). An arc extinguishing device and an arc extinguishing method.