JP2002075136A - Arc-extinguishing apparatus, switch and method for arc extinguishing provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arc-extinguishing apparatus, a switch and a method for arc-extinguishing which are provided with the same which allow reducing the distance between a fixed electrode and a movable electrode. SOLUTION: An arc-extinguishing chamber 31 is fixed and disposed on the side of the fixed electrode 16, where the arc occurs between the fixed electrode 16 and the movable electrode 19, at open circuit times. A movable partition 32 is supported movably in the chamber 31. The movable partition 32 is interconnected operationally to a linking mechanism L to let a partition 61a of the movable partition 32 in the chamber 31 where the arc occurs, by interlocking to the breaking operation of the movable electrode 19. When there is open circuit, the partition 61a advances into the chamber 31 so as to interrupt the arc. Accordingly, the path of the arc is bent so as to detour the partition 61a, and the insulating distance between both electrodes 16, 19 is sufficiently ensured and can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as this type of arc extinguishing device,
For example, a structure as disclosed in Japanese Utility Model Publication No. 63-33460 is known. That is, as shown in FIGS. 9A to 9C, the arc extinguishing device 91 includes a pair of arc extinguishing chamber main bodies 92 and 93.
The arc-extinguishing members 94 and 95 are supported in the arc-extinguishing chamber main bodies 92 and 93 so as to be tiltable opposite to each other. The arc extinguishing members 94 and 95 are urged in directions approaching each other by the elastic force of a spring 96 interposed between the respective outer surfaces and the inner surfaces of the arc extinguishing chamber main bodies 92 and 93. A movable electrode 97 can enter between the arc extinguishing members 94 and 95 against the elastic force of the spring.

In the closed state shown in FIG. 9A, the movable electrode 97 is interposed between the arc extinguishing members 94 and 95, and is fixed below the arc extinguishing chamber main bodies 92 and 93 (see FIG. 9A). (Abbreviated). When the circuit is opened from this closed state, as shown in FIG. 9B, as the movable electrode 97 comes out from between the two arc extinguishing members 94 and 95, the two arc extinguishing members 94 and 95 become elastic by the spring 96. As a result, the space in which the movable electrode 97 is located moves so as to be sequentially closed from the fixed electrode side. Then, as shown in FIG. 9 (c), when the movable electrode 97 is completely removed from between the arc extinguishing members 94 and 95, the arc generated between the fixed electrode and the movable electrode 97 is reduced. When the inner surfaces of the 95 are in close contact with each other, they are pushed out and extinguished.

[0004]

However, in the conventional arc extinguishing device 91, the two arc extinguishing members 94, 9 are opened when the circuit is opened.
In some cases, the inner surfaces of Nos. 5 did not completely adhere to each other and a gap was formed. For this reason, the arc is not completely pushed off,
There was a risk of restriking. Therefore, it is necessary to provide a certain or more insulation distance between the fixed electrode and the movable electrode 97 in order to maintain the insulation between the two electrodes, and there is a limit in reducing the distance between the two electrodes.

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 capable of shortening a distance between a fixed electrode and a movable electrode, and an arc extinguishing device having the same. A switch and an arc extinguishing method are provided.

[0006]

According to a first aspect of the present invention, an arc generated between a fixed electrode and a movable electrode is extinguished in an arc-extinguishing chamber fixed to the fixed electrode when the circuit is opened. In the arc extinguishing method for a switch described above, the gist of the present invention is to make the partition member enter the arc generating portion so as to be substantially orthogonal to the direction in which the arc is elongated.

According to a second aspect of the present invention, in the first aspect of the present invention, the operation of entering the arc generating portion of the partition member is performed in conjunction with the opening operation of the movable electrode. I do.

According to a third aspect of the present invention, there is provided an arc extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode when a circuit is opened, wherein an arc extinguishing chamber is fixedly arranged on the fixed electrode side. The interior of the room is used as an arc generating portion between the fixed electrode and the movable electrode when the circuit is opened, and the partition member is also rotatably supported on the fixed electrode side, interlocking with the opening operation of the movable electrode. The gist of the present invention is to provide a link mechanism for allowing the partition member to enter the arc-extinguishing chamber where an arc is generated.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a portion of the arc-extinguishing chamber is cut off in the vicinity of the fixed electrode to form a slit for entering the partition wall member. The gist is that a closing member for closing the slit from the outside is projected from the partition member.

According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the partition member is formed in an arc plate shape and has a fan-shaped side wall covering both sides of the arc extinguishing chamber. Having a shaft attached to the fixed electrode side via a shaft attachment portion provided on the side wall, and operatively connected to a support shaft provided on the side wall, a link mechanism enabling the movable electrode to be operated from the outside, The gist of the invention is that the partition member can enter the arc generating portion of the arc-extinguishing chamber when the circuit is opened.

According to a sixth aspect of the present invention, a fixed electrode and an arc-extinguishing chamber covering the fixed electrode are fixed to a conductive rod protruding from an inner end of one bushing penetrating the main body case of the switch.
A partition member is axially mounted on the side of the storage section of the arc-extinguishing chamber,
Similarly, a slit is formed at the base end of the arc-extinguishing chamber of the arc-extinguishing chamber so that the partition wall member can be entered, and a movable electrode is formed on the conductive rod protruding from the inner end of the other bushing. The contact blade is pivotally attached to and detached from the fixed electrode, and the contact blade is rotatably linked via a link mechanism from a support shaft that is rotated in conjunction with an external operation. The gist is that the partition member is interlocked with the slit so as to be able to enter the slit via a mechanism.

According to a seventh aspect of the present invention, in the sixth aspect of the invention, the arc extinguishing chamber is formed obliquely with respect to an accommodation portion of the fixed electrode fixed to the conductive rod and an upper surface thereof. The gist of the present invention is that a slit is formed at the base end of the slit arc extinguishing chamber, which is in the vicinity of the fixed electrode and is located at the base end of the slit arc extinguishing chamber.

According to an eighth aspect of the present invention, in the sixth or seventh aspect of the present invention, the accommodating portion comprises a bottom accommodating member and an upper accommodating member which can be assembled together.
The gist is that the fixed electrode can be accommodated.

According to a ninth aspect of the present invention, in the invention according to any one of the sixth to eighth aspects, a support shaft on which a partition member can be pivotally mounted is provided in the housing portion. Is the gist.

According to a tenth aspect of the present invention, in the invention of the eighth or ninth aspect, the bottom accommodating member and the upper accommodating member are provided with semi-cylindrical projections respectively corresponding to each other. When the is assembled, the gist is that a support shaft for rotatably supporting the partition member is constituted by the two projections.

According to an eleventh aspect of the present invention, in the invention according to any one of the eighth to tenth aspects, the direction in which the arc-extinguishing gas generated by the arc heat is released is moved away from the orbit of the movable electrode. The gist is that the partition member is moved as described above. (Function) In the first aspect of the present invention, the partition member enters the arc generating portion so as to be substantially perpendicular to the direction in which the arc is elongated. For this reason, the arc path is bent so as to bypass the partition wall member, and the arc path, that is, the arc extending distance is larger than that in the case of a straight line. The degree of bending of the arc path increases as the partition member enters the arc generating site.

According to the second aspect of the invention, in addition to the operation of the first aspect, the partition member enters the arc generating portion in conjunction with the opening operation of the movable electrode. According to the third aspect of the present invention, the partition member enters the arc-extinguishing chamber where the arc is generated, in conjunction with the opening operation of the movable electrode.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, in a closed state, the slit is closed from the outside by the closing member. Claim 5
In the invention described in (1), in addition to the effect of the invention described in (3) or (4), the partition member enters the arc generating portion in the arc-extinguishing chamber in conjunction with the opening operation of the movable electrode.

In the invention according to claim 6, the partition member enters the slit in conjunction with the rotation of the movable electrode by an external operation. In the invention described in claim 7, in addition to the effect of the invention described in claim 6, at the time of opening, the partition member enters between the accommodating portion and the narrow arc extinguishing chamber, and the arc path corresponds to the partition member. Is bent so as to detour.

According to the eighth aspect of the present invention, in addition to the function of the sixth or seventh aspect, the fixed electrode is formed in the housing portion, that is, the space formed by the bottom housing member and the upper housing member. Housed within. The bottom receiving member is fixed to the fixed electrode, and the upper receiving member is attached to the fixed bottom receiving member.

According to the ninth aspect of the present invention, in addition to the function of any one of the sixth to eighth aspects of the present invention, a partition member is pivotally attached to the housing. According to the tenth aspect of the present invention, in addition to the operation of the eighth aspect or the ninth aspect, when the bottom housing member and the upper housing member are assembled, the semi-cylindrical projections provided on each of the bottom housing member and the upper housing member. A cylindrical support shaft is configured.

According to an eleventh aspect of the present invention, in addition to the operation of the invention according to any one of the eighth to tenth aspects, when the bottom housing member, the arc-extinguishing chamber, and the partition member are combined. The inside of the arc-extinguishing chamber is formed in a bag shape so as to discharge the arc-extinguishing gas in an arbitrary direction. Due to the movement of the partition member, the direction in which the arc-extinguishing gas is released is away from the orbit of the movable electrode.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a switch according to an embodiment of the present invention; FIG.

As shown in FIG. 1, a power supply side bushing 1 is provided on both side walls of the main body case 12 of the switch 11 facing each other.
The 3 and the load-side bushings 14 are supported so as to face each other for each of the three phases (only one phase is shown in FIG. 1). A conductive rod 15 protrudes from the inner end of the power supply side bushing 13, and a fixed electrode 16 is fixed on the upper surface of the conductive rod 15 (see FIG. 3). A conductive rod 17 protrudes from an inner end of the load-side bushing 14, and a base end of a movable electrode 19 is rotatably supported on the conductive rod 17 via a shaft 18. The movable electrode 19 is composed of a single plate-shaped contact blade 19a.

On the other hand, in the lower part of the main body case 12,
A turning shaft 20 operatively connected to an operation handle (not shown) outside the main body case 12 is provided through an opening / closing mechanism (not shown) including a plurality of links and the like.
A lever 21 is fixed to 0 so as to be integrally rotatable. One end of a drive link 22 is rotatably connected to the end of the lever 21, and the other end of the drive link 22 is rotatably connected to substantially the center of the movable electrode 19. Also,
One end of an operation link 23 is rotatably connected to the tip of the lever 21.

Therefore, when the operating handle is operated, the movable electrode 19 is moved around the shaft 18 through the opening / closing mechanism, the rotating shaft 20, the lever 21, and the driving link 22 as shown in FIG.
1 between an input position indicated by a solid line and an open position indicated by a two-dot chain line in FIG. The opening / closing mechanism, the rotating shaft 20, the lever 21, the drive link 22, and the operation link 23 allow the movable electrode 19 to be operated from the outside, and the partition wall member 61a described below is arc extinguished in which an arc is generated. Room body 31
A link mechanism L for entering the inside is constituted. (Arc Extinguishing Device) As shown in FIG. 2, an arc extinguishing device 30 is provided at the inner end of the power supply side bushing 13. The arc extinguishing device 30 includes an arc extinguishing chamber main body 31 provided so as to cover the fixed electrode 16, and a movable partition member 32 rotatably provided with respect to the arc extinguishing chamber main body 31. The arc extinguishing chamber main body 31 and the movable partition wall member 32 are each formed of an insulating and arc extinguishing synthetic resin such as polyacetal, polytetrafluoroethylene, melamine, urea, and nylon.

As shown in FIG. 3, the arc extinguishing chamber main body 31 is provided.
A housing portion 41 that covers the conductive rod 15 and the fixed electrode 16,
A narrow arc extinguishing chamber 42 is formed obliquely to the upper surface of the accommodating portion 41. The inside of the arc extinguishing chamber main body 31 is an arc generating portion where an arc is generated when the circuit is opened. As shown in FIGS. 3 and 4 (a) and 4 (b), the housing portion 41 is a bottom housing member 4 which can be assembled with each other.
3 and an upper housing member 44.

As shown in FIG.
Is provided with a bottom wall member 45 constituting a bottom wall of the housing portion 41. On the upper surface of the bottom wall member 45, a connecting portion 46 having a flat U-shape is formed so as to be open on the power supply side bushing 13 side. As shown in FIGS. 3 and 4A and 4B, a portion of the coupling portion 46 on the power supply side bushing 13 side from a substantially center thereof is a pair of side wall portions 47 forming a part of both side walls of the housing portion 41. , 47.

Semi-cylindrical projections 49 are formed on the outer surfaces of both side walls 47, 47, and the projection 49 has a flat surface 49a on the power supply side bushing 13 side.
The coupling portion 46 has a fitting portion 48 on the opposite side of the power supply side bushing 13 so as to be able to enter the inside of the upper housing member 44. As shown in FIG. 3, the bottom receiving member 43 is attached to the lower surface of the conductive rod 15 by tightening a nut N from below to a bolt B that penetrates the fixed electrode 16 and the conductive rod 15 and is inserted from above. Is fixed.

As shown in FIG. 3, the upper housing member 44
Is formed in a box shape with an open bottom. Notch recesses 5 are formed on both side walls 51 of the upper housing member 44, respectively.
2, 52 (only one is shown in FIG. 3). As shown in FIG. 4A, the cutout recess 52 is provided so as to have an uneven relationship with the side wall 47 of the bottom receiving member 43. As shown in FIGS. 3 and 4 (b), semi-cylindrical projections 54, 54 are formed on both side walls 51, 51, respectively. The surface 54a is set.

As shown in FIGS. 2 and 3, the upper housing member 44 is fitted from above into the bottom housing member 43 fixed to the conductive rod 15, whereby the power supply side bushing 1 is mounted.
3 is fixed to the inner end. As shown in FIG. 4A, the side walls 47, 47 of the bottom housing member 43 and the side walls 51, 51 of the upper housing member 44 are held in an abutting state. The fitting portion 48 of the bottom receiving member 43 is located inside the upper receiving member 44. Also,
The flat surfaces 49a, 54a of the two projections 49, 54 coincide with each other, and a cylindrical support shaft 60 is formed by the two projections 49, 54.
Are formed. As shown in FIG. 4B, a groove 55 is continuously formed at a central portion from the upper wall of the upper housing member 44 to the side wall of the load-side bushing 14, and the movable electrode 19 has the groove 55 formed therein. It is possible to pass.

As shown in FIGS. 3 and 4 (a) and 4 (b), the narrow arc extinguishing chamber 42 is formed in the groove 5 of the upper accommodation member 44.
5, a pair of narrow arc extinguishing members 56a facing each other,
56a. The two arc extinguishing members 56a are separated from each other so that the movable electrode 19 can pass therethrough.
Both narrow arc extinguishing members 56a, 56a are provided so as to form a predetermined angle with respect to the upper surface of the upper housing member 44 and from the upper surface of the upper housing member 44 to the upper center of the side surface on the side opposite to the power supply side bushing 13. ing. Both gap extinguishing members 56a, 5
The tips of 6a are expanded in a direction away from each other.

As shown in FIGS. 3 and 4 (a), arc-shaped slits 5 having a predetermined radius of curvature are provided at the base ends of the narrow gap extinguishing members 56a, 56a, which are in the immediate vicinity of the fixed electrode 16.
7 are formed. As shown in FIGS. 3 and 4 (a), arcuate plate-shaped lower guide members 58 are respectively provided on the outer surfaces of the narrow gap extinguishing members 56a, 56a so as to protrude along the descending portions of the slits 57. ing. On the outer surfaces of the narrow arc extinguishing members 56a, 56a, an upper guide member 59 in the form of an arc plate is provided above the slit 57.
8 is provided so as to be spaced from the upper surface by a predetermined distance.

(Movable Partition Member) As shown in FIGS. 2 and 3, the movable partition member 32 has a storage chamber 61 that covers a part of the storage section 41. The side wall of the storage chamber 61 on the load side bushing 14 side is an arc-shaped partition member 61a having a predetermined radius of curvature. The partition member 61a is formed so as to be able to enter the slit 57.

As shown in FIGS. 3 and 5 (a) and 5 (b), the accommodation chamber 61 is provided with a pair of fan-shaped side wall members 61b, 61b facing each other. Both side wall members 61b,
A semicircular shaft attachment portion 62 is provided on the power supply side bushing 13 side of 61b, and an insertion hole 63 is formed in the coaxial attachment portion 62. An operating pin 64 is provided near the center of each of the side wall members 61b, 61b near the partition member 61a.
Are protruding.

As shown in FIG. 2, the insertion hole 6
The support shaft 60 is inserted through 3, and the movable partition member 32 is rotatably mounted on the arc extinguishing chamber main body 31. The other end of the operation link 23 is rotatably connected to each of the operation pins 64. Accordingly, the movable partition member 32 is supported by the support shaft 60 via the opening / closing mechanism (not shown), the rotation shaft 20, the lever 21, the operation link 23, and the operation pin 64, as the operation handle is operated. It moves between the loading corresponding position shown in FIG. 2 and the opening corresponding position shown in FIG.

As shown in FIGS. 3 and 5 (a) and 5 (b), a pair of arc-shaped plate-like closing members 65 are provided on the outer surface of the partition member 61a so as to be orthogonal to the partition member 61a. It is protruding. The two closing members 65 are separated by a predetermined distance, and the lower guide member 58 and the upper guide member 5 are separated.
9, and both narrow arc extinguishing members 56a, 56
a is slidable with respect to the outer surface. FIG.
In the state shown in FIG. 7, the closing member 65 closes the slit 57 from outside.

As shown in FIGS. 3 and 5 (a) and 5 (b), a descending portion of each of the closing members 65 protruding from the partition member 61a has a guided member 66 in the form of an arc plate.
Are formed so as to be orthogonal to both closing members 65. Both guided members 66 are slidable along the upper surface of the lower guide member 58.

Next, the switch 11 constructed as described above is used.
The operation at the time of opening the circuit will be described. In the closing state shown in FIG. 2, when the operation handle is opened, the movable electrode 1
Reference numeral 9 turns right around the shaft 18. Then, as shown in FIG. 6, when the movable electrode 19 is separated from the fixed electrode 16, an arc is generated between the electrodes 16 and 19. With the right rotation of the movable electrode 19, the movable electrode 19 is connected to the narrow arc extinguishing member 56.
a, and moves upward from below between 56a. That is, the movable electrode 19 is sandwiched between the narrow gap extinguishing members 56a, 56a, and the arc generated between the electrodes 16, 19 is elongated while the narrow gap is extinguished. Further, the arc extinguishing gas generated by the arc heat promotes arc extinguishing. FIG.
As shown in (a), when the slit 57 is closed by the closing member 65, leakage of the arc-extinguishing gas from the slit 57 is prevented, and the arc-extinguishing performance of the arc-extinguishing device 30 is improved.

On the other hand, with the opening operation of the operation handle, the lever 21 turns clockwise and the operation link 23 moves upward. The movable partition member 32 is moved upward via the operation pin 64 and rotates leftward about the support shaft 60. FIG.
As shown in FIG. 8B, the partition member 61a smoothly enters the slit 57 while the guided member 66 is guided by the lower guide member 58. That is, the partition member 61a
Enters the arc generating portion between the electrodes 16 and 19 in the arc-extinguishing chamber main body 31 so as to be substantially orthogonal to the direction in which the arc is elongated.

In other words, the partition member 61a moves so as to block a straight line connecting the arc generating portion of the fixed electrode 16 and the arc generating portion of the movable electrode 19. The partition member 61a is provided with both electrodes 16, 19 so as to block the generated arc.
Intervene in between. For this reason, as shown in FIG. 6, the arc path is bent so as to bypass the partition wall member 61a, and the arc path, that is, the arc extending distance becomes larger than that in the case of a straight line. The degree of bending of the arc path increases as the partition member 61a enters the slit 57.

When the movable electrode 19 moves to the open position shown in FIG. 7, the arc is completely extinguished and the opening operation ends. At this time, as shown in FIG. 7, the arc path is bent so that the insulation distance between the electrodes 16 and 19 is sufficiently ensured. That is, after the completion of the opening operation, the partition member 61a functions as an in-phase insulation barrier, and the dielectric strength between the electrodes 16 and 19 is improved. Therefore, the distance between the electrodes 16 and 19 can be reduced. Note that, at the time of closing, 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) At the time of opening, the partition wall member 6 is arranged so as to be substantially perpendicular to the direction in which the arc is extended with respect to the arc generation site.
1a was made to enter. For this reason, the arc path is bent so as to bypass the partition wall member 61a, and the arc extending distance is larger than that in the case of a straight line. Therefore, the distance between the fixed electrode 16 and the movable electrode 19 can be reduced.

(2) The operation of the partition member 61a to enter the arc generating portion is performed in conjunction with the opening operation of the movable electrode 19. That is, the partition wall member 61a enters the arc generating portion in accordance with the arc generating timing, and the dielectric strength between the electrodes 16 and 19 can be efficiently improved.

(3) The movable partition member 32 is rotatably supported with respect to the arc-extinguishing chamber main body 31 arranged and fixed on the fixed electrode 16 side. Then, in conjunction with the opening operation of the movable electrode 19, a link mechanism L that rotates the movable partition member 32 and causes the partition member 61a to enter the arc-extinguishing chamber main body 31 where an arc is generated.
Was provided. Therefore, the partition member 61a can be linked with the opening operation of the movable electrode 19 with a simple configuration.

(4) A portion of the arc-extinguishing chamber main body 31 that is in the vicinity of the fixed electrode 16 is cut out, and the slit 5 for entering the partition member 61a is cut off.
7 was formed. The partition member 61a is provided with a closing member 65 for closing the slit 57 from outside in a closed state. Therefore, it is possible to prevent the arc-extinguishing gas generated in the arc-extinguishing chamber main body 31 from leaking from the slit 57 when the circuit is opened.

(5) Housing 41 for housing fixed electrode 16
Are composed of a bottom housing member 43 and an upper housing member 44 which can be assembled with each other. That is, the bolt B and the nut N
The bottom housing member 43 is fixed to the conductive rod 15 by the above, and the upper housing member 44 is fitted into the bottom housing member 43 from above. For this reason, attachment of the arc extinguishing chamber main body 31 to the fixed electrode 16 is simplified.

(6) The semi-cylindrical projections 4 corresponding to each other are formed on the bottom accommodation member 43 and the upper accommodation member 44, respectively.
9 and 54 are provided, and when the two 43 and 44 are assembled, the projection 49 and 54 constitute the support shaft 60 that rotatably supports the movable partition member 32.
For this reason, by attaching the movable partition member 32 to the support shaft 60, a stable operation of inserting the movable partition member 32 into the arc-extinguishing chamber main body 31 is obtained, and the bottom housing member 4
The connection between 3 and the upper housing member 44 becomes stronger.

The above embodiment may be modified and implemented as follows. The arc extinguishing chamber main body 31 may be formed as shown in FIG. That is, the discharge holes 31b may be formed in the V-shaped connecting member 31a that connects the power supply side bushing 13 side of the narrow gap extinguishing members 56a, 56a. The discharge hole 31b is formed so as to be located above the opening 30a. With this configuration, the heat generated by the arc is generated in the bag-shaped space X formed by the arc-extinguishing chamber main body 31, the movable partition member 32, and the bottom wall member 45 with the movement of the movable partition member 32. The pressure instantaneously rises due to the arc-extinguishing gas generated by the thermal decomposition of the arc-extinguishing chamber main body 31 and the like. This is because the area of the discharge port of the arc-extinguishing gas, that is, the opening area of the opening 30a is reduced by the movement of the movable partition member 32. As the pressure in the space X rises, the arc-extinguishing gas is released from the opening 30a, and the arc-extinguishing gas released from the opening 30a is discharged to the outside of the arc-extinguishing device 30 through the discharge hole 31b. Is done. That is, the partition wall member 61a moves so that the direction in which the arc-extinguishing gas is released is away from the orbit of the movable electrode 19. In this embodiment, the arc-extinguishing gas is discharged upward, but not discharged toward the movable electrode 19. Generally, since the arc is cut off while extinguishing the arc, diffused electrons are mixed in the arc-extinguishing gas. For this reason, for example, when the arc-extinguishing performance is reduced due to the consumption of the arc-extinguishing chamber main body 31 and the gas with reduced arc-extinguishing properties accompanied by diffused electrons is emitted toward the movable electrode 19, the movable electrode 19 is opened. Even if arc extinguishing is completed once, there is a possibility that a re-ignition phenomenon may occur with a slight time lag. In this embodiment, since the arc-extinguishing gas is emitted upward and not emitted in the direction of the movable electrode 19, even if the arc-extinguishing performance is reduced due to wear of the arc-extinguishing chamber main body 31 or the like, re-ignition is unlikely to occur. .

The arc extinguishing chamber main body 31 may be formed as shown in FIG. That is, the upper portion of the U-shaped portion of the connecting member 31a may be omitted. Even in this case, the arc-extinguishing gas is discharged upward, as in the case where the discharge hole 31b is formed in the connecting member 31a.
No emission in 9 directions. Therefore, the arc extinguishing device 30
In the case where the arc extinguishing performance is deteriorated, re-ignition can be prevented.

· Arc extinguishing device 3 shown in FIGS. 1, 9 and 10
An opening / closing unit including the fixed electrode 16, the fixed electrode 16, the movable electrode 19, the link mechanism L, and the like may be provided so that the top and bottom are reversed. For example, at the time of closing, the movable electrode 19 rotates left around the shaft 18,
It contacts the fixed electrode 16 from below. Further, at the time of opening, the opening 30a is located below in FIGS. 1, 9 and 10, and the arc-extinguishing gas is discharged downward. Even in this case, the arc-extinguishing gas is not released in the direction of the movable electrode 19, and re-ignition can be prevented when the arc-extinguishing performance is reduced due to the consumption of the arc-extinguishing chamber main body 31 and the like.

In this embodiment, the present invention is applied to the switch 11 having the movable electrode 19 composed of a single plate-shaped contact blade 19a. However, the switch provided with the movable electrode composed of the two plate-shaped contact blades. May be applied. That is, the partition is advanced so as to block the arc generated between the two contact blades and the fixed electrode. Also in this case, the dielectric strength between the fixed electrode and the movable electrode can be improved, and the distance between the two electrodes can be reduced.

[0053]

According to the first aspect of the present invention, the flash distance between the fixed electrode and the movable electrode is increased, and the distance between the two electrodes can be reduced.

According to the invention described in any one of claims 2 and 5 to 7, the partition member enters the arc generation site in accordance with the arc generation timing, thereby improving the efficiency. In addition, the dielectric strength can be improved.

According to the third aspect of the present invention, the partition member can be linked with the opening operation of the movable electrode with a simple configuration. According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, it is possible to prevent the arc-extinguishing gas generated in the arc-extinguishing chamber from leaking from the slit when the circuit is opened.

According to the invention of claim 8, according to claim 6,
Or, in addition to the effect of the invention described in claim 7, the housing portion can be easily attached to the fixed electrode. According to the ninth aspect of the present invention, in addition to the operation of the invention according to the sixth aspect,
The partition member can be turned around the support shaft.

According to the tenth aspect of the invention, in addition to the effects of the eighth or ninth aspect of the present invention, the partition member is pivotally mounted on the support shaft, so that the bottom receiving member and the upper portion can be mounted. The connection with the housing member can be further strengthened.

According to the eleventh aspect, in addition to the effects of the eighth aspect, the arc-extinguishing gas is moved away from the orbit of the movable electrode. The release makes it difficult for restriking to occur even when the arc-extinguishing performance is reduced due to consumption of the arc-extinguishing chamber.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a switch.

FIG. 2 is a front view of the opening / closing unit in a closed state.

FIG. 3 is an exploded perspective view showing attachment of the arc extinguishing device.

FIG. 4A is an exploded front view of the arc extinguishing chamber main body. (B)
2 is an exploded side view of the arc extinguishing chamber main body.

FIG. 5A is a front view of a movable partition member. (B)
9 is a side view of the movable partition member.

FIG. 6 is a front view of the opening / closing unit during opening.

FIG. 7 is a front view of the opening / closing unit in an open state.

FIG. 8A is a cross-sectional view of a main part along line 1-1 in FIG. 2; FIG. 7B is a cross-sectional view of a main part taken along line 2-2 in FIG. 6.

FIG. 9 is a front view of an opening and closing unit according to another embodiment.

FIG. 10 is a front view of an opening and closing unit according to another embodiment.

FIGS. 11A to 11C are front sectional views of a conventional arc-extinguishing chamber.

[Explanation of symbols]

11 switch, 12 body case, 13 power supply side bushing, 14 load side bushing, 15 conductive bar, 16
Fixed electrode, 17: conductive rod, 19: movable electrode, 19a: contact blade, 30: arc extinguishing device, 31: arc extinguishing chamber main body (arc extinguishing chamber),
Reference numeral 32: movable partition member, 41: housing portion, 42: narrow arc extinguishing chamber, 43: bottom housing member, 44: upper housing member, 49,
54 ... projection, 57 ... slit, 60 ... support shaft, 61a ...
Partition member, 61b: side wall, 62: shaft attachment portion, 64: operating pin, 65: closing member, L: link mechanism.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsumasa Kodera, Ineragisa, Inayama-shi, Aichi Prefecture, Energy Energy Support Co., Ltd.

Claims (11)

[Claims] 1. An arc extinguishing method for a switch, wherein an arc generated between a fixed electrode and a movable electrode is extinguished in an arc extinguishing chamber fixed to a fixed electrode when the circuit is opened. An arc extinguishing method for a switch, in which a partition member is inserted so as to be substantially perpendicular to a direction in which an arc is extended to a part. 2. The arc extinguishing method for a switch according to claim 1, wherein the operation of entering the arc generating portion of the partition member is performed in conjunction with an opening operation of a movable electrode. 3. An arc-extinguishing device for extinguishing an arc generated between a fixed electrode and a movable electrode at the time of opening a circuit, wherein an arc-extinguishing chamber is fixedly arranged on the fixed electrode side, and the room is opened when the circuit is opened. Along with a portion where an arc generated between the fixed electrode and the movable electrode is generated, a partition member is also rotatably supported on the fixed electrode side, and in conjunction with the opening operation of the movable electrode, the partition member is connected to the arc. An arc extinguishing device for a switch provided with a link mechanism for entering a generated arc extinguishing chamber. 4. A slit for entering the partition wall member is formed by cutting out a portion of the arc-extinguishing chamber immediately adjacent to the fixed electrode, and a closing member for closing the slit from the outside in the closed state protrudes from the partition wall member. An arc extinguishing device for a switch according to claim 3. 5. The partition member is formed in an arc plate shape, has a fan-shaped side wall covering both sides of the arc extinguishing chamber, and is axially attached to the fixed electrode via an axially provided portion provided on the side wall. And a link mechanism that enables the movable electrode to be operated from the outside with respect to the support shaft provided on the side wall.
The arc extinguishing device for a switch according to claim 3 or 4, wherein the partition wall member can enter an arc generating site of the arc extinguishing chamber. 6. A fixed electrode and an arc-extinguishing chamber covering the fixed electrode are fixed to a conductive rod protruding from an inner end of one bushing penetrating a main body case of the switch, and a side surface of a housing portion of the arc-extinguishing chamber. In the same manner as above, a partition member is axially mounted, and a slit is formed at the base end of the narrow arc extinguishing chamber of the arc extinguishing chamber so that the partition member can be inserted into the slit. A movable electrode is attached to the conductive rod so that the contact blade can be attached to and detached from the fixed electrode, and the contact blade is connected via a link mechanism from a support shaft that is rotated in conjunction with an external operation. A switch which is rotatably linked to the partition member and is also linked to the slit member via a link mechanism. 7. The arc-extinguishing chamber comprises a fixed electrode accommodating portion fixed to a conductive rod, and a narrow arc-extinguishing chamber formed obliquely with respect to the upper surface thereof. 7. The arc extinguishing device for a switch according to claim 6, wherein a slit is formed at a base end of the narrow arc extinguishing chamber, into which the partition member enters when the circuit is opened. 8. The arc extinguishing device for a switch according to claim 6, wherein the housing portion includes a bottom housing member and an upper housing member that can be assembled to each other, and can house a fixed electrode. 9. The arc extinguishing device for a switch according to claim 6, wherein a support shaft on which a partition member can be attached is provided in the housing portion. 10. The bottom receiving member and the upper receiving member are provided with semi-cylindrical projections respectively corresponding to each other, and when both members are assembled, the two projections support the partition member rotatably. The arc extinguishing device for a switch according to claim 8 or 9, wherein the shaft is configured. 11. The partition member according to claim 8, wherein the partition member moves so that the direction of release of the arc-extinguishing gas generated by the arc heat is away from the orbit of the movable electrode. Switch arc extinguishing device.