JP2015170537A - switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement downsizing as well as ensuring safety of a circuit and reliability of cutoff performance by using electromagnetic force generated by magnetic flux density generated by a current path and current of an arc itself.SOLUTION: A movable contactor 6 and a fixed contactor 4 are formed and arranged so as to comprise: a fixed electrification contact 4d and a movable electrification contact 6d opposite to each other so as to be separated and apart from each other; a movable arc contact 6b and a fixed arc contact 4a that are together connected to the fixed electrification contact 4d and the movable electrification contact 6d when rated current flows, and are separated and apart from each other belatedly after the fixed electrification contact 4d and the movable electrification contact 6d are separated and apart from each other; and a movable arc current conductor 6c and a fixed arc current conductor 4b that are formed so that their cross sectional area is smaller than those of contact surfaces of the fixed electrification contact 4d and the movable electrification contact 6d, and are arranged so as to be vertical to the arc and have current directions inverse to each other. The movable contactor 6 and the fixed contactor 4 are also formed and arranged so that the movable arc current conductor 6c and the movable arc contact 6b are accommodated in a recess part of a fixed conductor 4e, in a closed electrode state.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchgear, and more particularly to a circuit breaker for interrupting overcurrent, and more particularly to a switchgear with improved performance of interrupting an arc generated between contacts when a current is interrupted.

  In the conventional switchgear, in order to quickly move the arc generated between the contacts to the arc extinguishing grid, the arc current path through which the arc current flows is formed narrower than the energization path through which the current flows. Thus, the electromagnetic force applied to the arc is strengthened (see, for example, Patent Document 1). In addition, there is one in which the electromagnetic force of the arc is increased by providing a coil in the vicinity of the arc contact, due to the magnetic field generated from the coil (see, for example, Patent Document 2).

JP 55-53839 (first page, FIG. 1) JP 59-81825 A (first page, FIG. 3)

In order to strengthen the electromagnetic force of the arc, it is important to increase the magnetic flux density acting on the arc. For example, the magnetic flux density is increased by arranging the movable contact and the fixed contact in parallel so that they are perpendicular to the arc and the current directions are opposite to each other. Further, the magnetic flux density can be increased by reducing the cross-sectional area of the arc current path, which is the current path that passes when the arc is generated, or increasing the arc current path length.
In the conventional switchgear as disclosed in Patent Document 1, the electromagnetic force is increased by arranging the movable contact and the fixed contact in parallel so that they are perpendicular to the arc and the current directions are opposite to each other. However, since the current-carrying contact and the arc contact are the same, the contact is damaged by the arc, which causes an increase in temperature between the contacts due to an increase in contact resistance. Further, the contact surface is damaged, the electric field is increased, the arc is difficult to move to the arc extinguishing grid, and there is a possibility that it cannot be interrupted.
In the technique such as Patent Document 2, the energized contact and the arc contact are separated, and the arc contact is opened after the energized contact is opened, so that only the arc contact is damaged and the energized contact is damaged. There is no worry to do. Furthermore, since the cross-sectional area of the arc current path is smaller than the cross-sectional area of the energizing current path, the current density of the arc current path is increased and the electromagnetic force applied to the arc is increased. However, when the arc current path is lengthened, the arc contact extends in the arc extinguishing grid direction, which increases the equipment size.

  The present invention has been made in order to solve the above-described problems of the prior art, and an object thereof is to provide a switchgear capable of quickly moving an arc and further downsizing an apparatus. .

  The switchgear according to the present invention includes a first conductor portion having a cubic shape, a second conductor portion facing the first conductor portion, and the second conductor portion of the first conductor portion. A first energizing contact provided in the facing portion and an opening recess provided together with the first energizing contact in the facing portion of the first conductor portion with the second conductor portion; Opposing portions of the first arc current conductor provided in the opening recess, the first arc contact provided in the first arc current conductor, and the first conductor portion of the second conductor portion. A second current-carrying contact provided with the second current-carrying contact in a portion of the second conductor part opposite to the first conductor part, and the second arc. A second arc contact provided on the current conductor; and the first arc power An arc extinguishing grid for extinguishing an arc generated between the first arc contact provided on a conductor and the second arc contact provided on the second arc current conductor; and An arc runner for traveling to the arc extinguishing grid, and the drive mechanism that receives the opening command in the closed state where the first and second energizing contacts and the first and second arc contacts are in contact with each other. By relatively moving the first and second conductor portions, the first and second current-carrying contacts that have been in contact with each other are made non-contact, and then the first and second that have been in contact with each other. The arc contact is not contacted, and an arc is generated between the first and second arc contacts, wherein the first and second arc current conductors are the first arc contact and the second arc contact. Arc contacts A magnetic field generated by the arc current path, which is formed in parallel so that currents flowing through the arc current path flow in opposite directions to each other. To drive the arc toward the arc extinguishing grid, and the respective cross-sectional areas of the first and second arc current conductors constituting the arc current path are the first current-carrying contact and the second current-carrying contact. It is formed smaller than the area of the contact surface with the current-carrying contact.

  According to this invention, while realizing miniaturization, the electromagnetic force that drives the arc can be increased and the arc can be quickly moved to the arc extinguishing grid, thereby reducing damage to the contacts and rapidly extinguishing the arc. Therefore, it is possible to obtain a switchgear that is small and has improved circuit safety and interruption performance.

It is a side view which shows roughly the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear by Embodiment 1 in this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which expands and shows the contactor of the pole closed state by Embodiment 1 in this invention, (a) is a top view which shows a part in cross section, (b) is a side view which shows a part in cross section, ( c) is a perspective view. It is the side view which expands the contactor in the middle of the opening state by Embodiment 1 in this invention, and shows a part with a cross section. It is a figure which expands and shows the contact of the arc generation state by Embodiment 1 in this invention, (a) is a side view which shows a part in cross section, (b) is a perspective view. It is a perspective view of the movable contact of the switchgear by Embodiment 2 in this invention. It is a perspective view of the movable contact of the switchgear by Embodiment 3 in this invention.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view schematically showing a main part configuration of an arc extinguishing chamber portion in the open state of the switchgear according to Embodiment 1. FIG. FIG. 2 is an enlarged view of a contact in a closed state according to the first embodiment, where (a) is a top view partially showing a cross section, (b) is a side view showing a part in cross section, c) is a perspective view. FIG. 3 is a side view showing, in section, a part of an enlarged contact in the middle of opening according to the first embodiment. FIGS. 4A and 4B are enlarged views of the contact in the arc generation state according to the first embodiment, where FIG. 4A is a side view partially showing a cross section and FIG. 4B is a perspective view.
In the figure, the switchgear is provided with terminals 2 and 3 connected to an external power circuit at both ends of a case 1 made of an insulator, and an arc extinguishing chamber A is provided at the center. In the arc extinguishing chamber A, a fixed contact 4 electrically connected to the terminal portion 2, an electrical connection via the terminal portion 3 and the conductor 5, and rotation around the rotation shaft 6 a are provided. The movable contactor 6 disposed above, the fixed-side arc runner 7 that is disposed above the movable contactor 6 and is electrically connected to the terminal portion 2, and the terminal portion 3 is electrically connected to the fixed-side arc runner 7. Movable arc runners 8 that are connected to each other, and an arc 9 that is disposed above the fixed arc runners 7 and the movable arc runners 8 and that is generated when the stationary contact 4 and the movable contact 6 are separated at the time of opening. An arc extinguishing grid 10 in which a plurality of arc extinguishing plates are stacked while being held at a predetermined interval for capturing and cooling is provided.

The fixed contact 4 includes a fixed arc contact 4a, a fixed arc current conductor 4b, a contact pressure spring 4c, a fixed energizing contact 4d, and a fixed conductor 4e.
The cube-shaped fixed conductor 4 e is provided with a recess C so as to be pushed out in a direction from the surface facing the movable contact 6 toward the terminal portion 2. An energizing contact 4d through which a rated current flows is disposed on a surface that is not the recess C facing the movable contact 6. Further, in the concave portion C of the fixed conductor 4e, a fixed arc current conductor 4b provided with a fixed arc contact 4a where the arc 9 is generated is arranged in a structure capable of moving electricity. The fixed arc current conductor 4b is formed with a cross-sectional area smaller than the current-carrying contact area, and is opened in a closed state of the movable contact 6 by a contact pressure spring 4c on a surface opposite to the fixed arc contact 4a. Contact pressure is applied in the direction. The end surface of the fixed arc contact 4a in the arc extinguishing grid 10 direction is formed to be the same as or less than the end surface of the fixed energizing contact 4d in the arc extinguishing grid 10 direction. Here, the concave portion C of the fixed conductor 4e has a side opening surface that faces the movable contact 6 and a side wall surface that forms a surface facing the side opening surface, and faces the arc-extinguishing grid 10. The plate-like fixed arc current conductor 4b formed like a strip has an upper opening surface that is formed and a lower bottom surface that forms a surface facing the upper opening surface. The opening portion is accommodated in a bottomed recess C provided in the cubic fixed conductor 4e. The lower end, which is one end of the fixed arc current conductor 4b, is supported by a pivot point provided on the lower bottom surface of the recess C, and the fixed arc current conductor 4b is rotatably provided with the lower end as a rotation center. Yes. The fixed arc contact 4a provided at the upper end which is the other end of the fixed arc current conductor 4b is movable forward and backward in the direction of the movable contact 6 by a predetermined distance range. The upper end of the fixed arc current conductor 4b does not protrude from the upper opening surface of the recess C toward the arc extinguishing grid 10, and the fixed arc current conductor 4b performs limited rotation only inside the recess C. .

  The movable contact 6 includes a movable arc contact 6b, a movable arc current conductor 6c, a movable energizing contact 6d, and a movable conductor 6e. The movable conductor 6e is provided with a movable energizing contact 6d through which a rated current flows on the surface facing the fixed energizing contact 4d. The movable conductor 6e faces the fixed contact 4 from the lower side of the surface facing the fixed contact 4 of the movable conductor 6e. Thus, the movable arc current conductor 6c protruding in an L shape with a smaller cross-sectional area than the energizing contact surface is formed. The longer the portion of the movable arc current conductor 6c that is formed perpendicular to the arc 9 projecting in an L shape, the longer the electromagnetic force becomes. A movable arc contact 6b is disposed on the movable arc current conductor 6c at a location facing the fixed arc contact 4a. The end surface of the movable arc contact 6b in the arc extinguishing grid 10 direction is formed to be the same or less than the end surface of the movable energizing contact 6d in the arc extinguishing grid 10 direction.

That is, in the closed state, the movable arc current conductor 6c and the movable arc contact 6b are formed and arranged so as to be accommodated in the fixed conductor 4e, and the movable arc current conductor 6c and the movable arc contact 6b are oriented in the arc extinguishing grid 10 direction. Therefore, it is possible to reduce the size.
Around the terminal portion 2, an overcurrent detector 11 that detects an overcurrent flowing through the terminal portion 2 and outputs an opening command is disposed. A contact opening command from the overcurrent detector 11 is transmitted to the drive mechanism 12, and the movable contact 6 is rotated around the rotating shaft 6a by the drive mechanism 12 to move the movable arc contact 6b with respect to the fixed arc contact 4a. However, the movable energizing contact 6d is configured to open and close with respect to the fixed energizing contact 4d.

Further, the fixed arc contact 4a and the movable arc contact 6b are opened later than the fixed energized contact 4d and the movable energized contact 6d, and an arc 9 is generated between the fixed arc contact 4a and the movable arc contact 6b. It is formed by adjusting the distance that the movable arc current conductor 6c protrudes in the direction of the stationary contact 4 and the spring length when the contact pressure spring 4c is in a released state.
The movable arc current conductor 6c may be integrated with the movable conductor 6e and may be made of the same material, or may be made of another material and coupled by bolts or welding.
The movable arc contact 6b may be integrated with the movable arc current conductor 6c and made of the same material. Further, the arc generation surface of the movable arc contact 6b and the surface of the movable arc current conductor 6c that faces the fixed contact 4 may be made the same.
Similarly, the configuration of the fixed contact 4 may be a structure in which the arc generation surface of the fixed arc contact 4a and the surface of the fixed arc current conductor 4b facing the movable contact 6 are aligned.

Next, the operation of the opening / closing device of the present invention will be described with reference to FIGS.
FIG. 2 is an enlarged view of the stationary contact 4 and the movable contact 6 in a closed state, where (a) is a top view showing a part in cross section, and (b) is a side view showing a part in cross section. (C) is a perspective view. In the closed state, the movable arc contact 6b and the fixed arc contact 4a, the movable energizing contact 6d, and the fixed energizing contact 4d are coupled to each other, and the rated current is energized. There are two energization paths for the rated current, one of which is movable conductor 6e → movable energization contact 6d → fixed energization contact 4d → fixed conductor 4e. The other is movable conductor 6e → movable arc current conductor 6c → movable arc contact 6b → fixed arc contact 4a → fixed arc current conductor 4b → fixed conductor 4e. That is, the movable arc contact 6b and the fixed arc contact 4a are in parallel with the movable energization contact 6d and the fixed energization contact 4d, and energize the rated current from two energization paths.

Subsequently, when an overcurrent such as a short-circuit current or an overload current flows, the overcurrent detector 11 detects the overcurrent, and issues a contact opening command to the drive mechanism unit 12 to open the movable contact 6. start.
FIG. 3 is an enlarged cross-sectional view of the stationary contact 4 and the movable contact 6 when the movable energizing contact 6d and the fixed energizing contact 4d are separated, in the middle of the opening. When the movable contact 6 starts to open, the movable energizing contact 6d and the fixed energizing contact 4d are separated. At that time, the opening operation is started so as to be accompanied by the movable arc contact 6b and the fixed arc contact 4a, but the movable arc contact 6b and the fixed arc contact 4a are coupled by the contact pressure spring 4c. Therefore, as shown by the arrow in FIG. 3, the overcurrent is as follows: movable conductor 6e → movable arc current conductor 6c → movable arc contact 6b → fixed arc contact 4a → fixed arc current conductor 4b → fixed conductor 4e. Energization is performed only at the contact 4a.

  Next, FIG. 4 is an enlarged view showing the stationary contact 4 and the movable contact 6 in an arc generation state, (a) is a side view partially showing a cross section, and (b) is a perspective view. When the movable contact 6 is further opened, the movable arc contact 6b and the fixed arc contact 4a are separated, and an arc 9 is generated between the movable arc contact 6b and the fixed arc contact 4a.

  The arc 9 generates an electromagnetic force that moves in the direction of the arc-extinguishing grid 10 by the magnetic flux density of the current flowing in the direction perpendicular to the arc 9 of the movable arc current conductor 6c and the fixed arc current conductor 4b. Since the movable arc current conductor 6c and the fixed arc current conductor 4b are formed with a smaller cross-sectional area than the energization contact surface of the movable energization contact 6d and the fixed energization contact 4d, the energization contact and the arc contact have the same configuration (for example, An electromagnetic force larger than that of Patent Document 1) can be obtained, and the arc 9 is quickly moved to the arc extinguishing grid 10 via the fixed side runner 7 and the movable side runner 8 to be extinguished.

As described above, the present invention is electrically connected to the pair of the fixed energizing contact 4d and the movable energizing contact 6d facing each other so as to be separated from each other, and is coupled together with the fixed energizing contact 4d and the movable energizing contact 6d at the rated current. More than the contact surfaces of the movable energizing contact 4d and the movable energizing contact 6d, the movable arc contact 6b, the fixed arc contact 4a, and the fixed energizing contact 4d and the movable energizing contact 6d that are separated after the opening. By providing the movable arc current conductor 6c and the fixed arc current conductor 4b which are formed with a small cross-sectional area and are arranged so as to be perpendicular to the arc 9 and opposite in current direction, the energized contact and the arc contact are the same. Electromagnetic force larger than that of the configuration (for example, Patent Document 1) can be obtained, and the arc 9 can be quickly moved to the arc extinguishing grid. Safety and cut-off performance is improved.
Here, the movable arc current conductor 6c and the fixed arc current conductor 4b, which are perpendicular to the arc 9 and arranged in parallel so that the current directions are opposite to each other, are the fixed energizing contact 4d and the movable energizing contact 6d. Since each cross-sectional area is smaller than the contact surface, the current density of the arc current path formed by the movable arc current conductor 6c and the fixed arc current conductor 4b via the arc 9 is increased, and the arc current path By increasing the current density, the magnetic flux density around the arc current path is increased, the magnetic flux density acting on the arc 9 is increased, and the magnetic driving force for the arc 9 is increased. By bringing the arc current path and the arc contacts 4a and 6b that generate the arc 9 close to each other, the magnetic flux density acting on the arc 9 can be increased, and a large magnetic driving force for the arc 9 can be ensured.
The movable arc current conductor 6c and the fixed arc current conductor 4b are formed with cross-sectional areas smaller than the contact surfaces of the fixed energizing contact 4d and the movable energizing contact 6d, respectively, and thus the length of the arc current path formed by each of them is The length of the arc current path can be easily increased with a thin conductor configuration even in a limited space such as the inside of the recess C, and the magnetic field with respect to the arc 9 can be increased. The driving force can be increased.
In the example shown in the first embodiment, one pair of the fixed energizing contact 4d and the movable energizing contact 6d is provided. The movable arc current conductor 6c and the fixed arc current conductor 4b each have a cross-sectional area smaller than the total contact area of the pair of the fixed energizing contact 4d and the pair of the movable energizing contact 6d and the movable arc contact 6b. In addition, the cross-sectional area is smaller than the contact area between one fixed energizing contact 4d of the pair and one movable energizing contact 6d of the pair.

Further, in the closed state, the movable contact 6 and the fixed contact 4 are formed and arranged so that the movable arc current conductor 6c and the movable arc contact 6b are accommodated in the concave portion of the fixed conductor 4e. Since the arc contact does not protrude in the arc extinguishing grid 10 direction as in the switchgear (for example, Patent Document 2), the size can be reduced.
That is, according to the present invention, it is possible to reduce the damage of the contact while realizing the miniaturization in the grid direction, and the safety and breaking performance of the circuit are improved.

In the first embodiment of the present invention, a first conductor portion made of a fixed conductor 4e having a cubic shape, a second conductor portion made of a movable conductor 6e facing the first conductor portion, and the first conductor portion A first energizing contact comprising a fixed energizing contact 4d provided at a portion of the conductor portion facing the second conductor portion and a portion of the first conductor portion facing the second conductor portion of the first conductor portion. An opening recess formed of a recess C provided together with the current-carrying contact, and a fixed arc current conductor 4b provided inside the opening recess of the first conductor portion and having an end portion that does not protrude from the internal space of the opening recess. 1 arc current conductor, a first arc contact comprising a fixed arc contact 4a provided on the first arc current conductor, and a portion of the second conductor portion facing the first conductor portion. Movable contact 6d A second arc current conductor composed of a movable arc current conductor 6c provided together with the second current-carrying contact at a portion of the second conductor portion facing the first conductor portion, and the second conductor portion; A second arc contact comprising a movable arc contact 6b provided on the second arc current conductor; a first arc contact provided on the first arc current conductor; and a second arc current conductor provided on the second arc current conductor. An arc extinguishing grid 10 constituting a partial element of the arc extinguishing chamber A for extinguishing the arc 9 generated between the second arc contact and an arc runner 7 for running the arc 9 to the arc extinguishing grid 10 , 8, and the movable contact 6 is constituted by the drive mechanism unit 12 that has received an opening command in a closed state where the first and second energizing contacts and the first and second arc contacts are in contact with each other. Movable conductor By driving e in the opening direction from the closed state and moving the first and second conductor portions relatively, the first and second conductive contacts 4d and 6d that are in contact with each other are moved. 2 is made non-contact, and after a predetermined time, the first and second arc contacts that have been in contact are made non-contact, and the arc 9 is made between the first and second arc contacts. The first and second arc current conductors generate an arc current path CP2 formed through an arc 9 generated between the first arc contact and the second arc contact. And arranged in parallel with each other in parallel so as to circulate currents flowing through the arc current path CP2 in opposite directions, and the arc 9 and the first in the arc current path CP2 And the second arc current conductor form a U-shaped arc current path portion, and the arc 9 is passed through the arc runners 7 and 8 by the magnetic field generated by the U-shaped arc current path portion of the arc current path CP2. Each of the first and second arc current conductors constituting the U-shaped arc current path portion of the arc current path CP2 is driven toward the arc extinguishing grid 10. An opening / closing device is proposed which is formed smaller than the area of the contact surface between the current-carrying contact and the second current-carrying contact.
According to the first embodiment of the present invention, the first arc current conductor composed of the fixed arc current conductor 4b that forms the arc current path CP2 by providing the first arc contact composed of the fixed arc contact 4a is the fixed conductor 4e. The arc-extinguishing grid 10 and the arc-extinguishing grid 10 are provided in an opening recess composed of a recess C that opens to the second conductor part consisting of the movable conductor 6e. Since it does not protrude toward the direction, the configuration can be reduced in size.
The first arc current conductor and the arc current conductor 6c, which are composed of the fixed arc current conductor 4b that is arranged in parallel to each other so as to be perpendicular to the arc 9 and have current directions opposite to each other and that constitute the arc current path CP2. The second arc current conductor made of is formed with a cross-sectional area smaller than the contact surface of the fixed energizing contact 4d and the movable energizing contact 6d, so that the second arc current conductor made of the movable arc current conductor 6c is fixed. The arc current path CP2 formed by the first arc current conductor composed of the arc current conductor 4b via the arc 9 is increased in current density, and the current density in the arc current path CP2 is increased, whereby the arc current path is increased. The magnetic flux density around CP2 is increased, the magnetic flux density acting on the arc 9 is increased, and the magnetic driving force for the arc 9 is increased. Than is.
As a result, the electromagnetic force that drives the arc can be increased and the arc can be quickly moved to the arc extinguishing grid while reducing the size of the arc, thereby reducing the damage on the contacts and promptly extinguishing the arc. Thus, it is possible to obtain a switchgear that is small and has improved circuit safety and interruption performance.

  Next, Embodiment 2 and Embodiment 3, which are modifications of Embodiment 1 for increasing the electromagnetic force acting on the arc 9 while being miniaturized, will be described with reference to FIGS. 5 and 6. To do.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a side view of the movable contact of the switchgear according to Embodiment 2 of the present invention.
In the second embodiment, the magnetic body 13 is arranged to cover at least one of the movable arc current conductor 6c and the fixed arc current conductor 4b in the direction in which the arc is generated. Other configurations are the same as those of the first embodiment.
In FIG. 5, the movable arc current conductor 6c is provided so as to cover both sides and the back surface of the movable arc current conductor 6c except for the surface of the movable arc current conductor 6c provided with the movable arc contact 6b that faces the fixed arc current conductor 4b. The form enclosed from three sides by the magnetic body 13 formed integrally is illustrated. The surface of the magnetic body 13 facing the fixed arc current conductor 4b is flush with the surface of the movable arc current conductor 6c facing the fixed arc current conductor 4b.
The fixed arc current conductor 4b may be covered with the magnetic body 13, and at least a part of the movable arc current conductor 6c or the fixed arc current conductor 4b may be covered with the magnetic body 13.

In the second embodiment configured as described above, the magnetic drive force is increased by increasing the magnetic flux density applied to the arc by the magnetic body 13, and the arc is easily transferred to the arc extinguishing grid. can do. Furthermore, since the movable arc current conductor 6c and the fixed arc current conductor 4b are reinforced by the magnetic body 13, the mechanical strength of the movable arc current conductor 6c and the fixed arc current conductor 4b can be increased.
In addition, since the electromagnetic force can be increased as the magnetic body 13 is closer to the arc spot, the magnetic body 13 may protrude to the contact surface of the movable arc contact 6b or the fixed arc contact 4a. That is, as shown in FIG. 5, the surface of the magnetic body 13 facing the fixed arc current conductor 4b is formed to be flush with the surface of the movable arc current conductor 6c facing the fixed arc current conductor 4b. Separately, the surface of the magnetic material 13 facing at least one of the fixed arc current conductor 4b and the movable arc current conductor 6c may be flush with the contact surface of the movable arc contact 6b or the fixed arc contact 4a. is there.

  According to the second embodiment of the present invention, it is possible to increase the electromagnetic force that drives the arc while realizing the miniaturization, and the arc can be quickly moved to the arc extinguishing grid, thereby reducing the damage on the contact and the arc. From the first arc movable conductor 6c and the movable arc current conductor 6c, which is a small-sized switchgear with improved circuit safety and cut-off performance. Since at least one part of at least one of the second arc current conductors is arranged so as to be covered with the magnetic material, the interruption performance can be further improved, and the mechanical strength can be increased to ensure the reliability.

Embodiment 3 FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a side view of the movable contact of the switchgear according to Embodiment 3 of the present invention.
In the third embodiment, at least one of the movable arc current conductor 6c and the fixed arc current conductor 4b other than the surface in the direction in which the arc is generated is disposed so as to be covered with the polymer material 14. Other configurations are the same as those of the first embodiment.
In FIG. 6, the movable arc current conductor 6c is provided so as to cover both sides and the back surface of the movable arc current conductor 6c except for the surface of the movable arc current conductor 6c provided with the movable arc contact 6b that faces the fixed arc current conductor 4b. The form which surrounded the three sides with the polymeric material 14 formed integrally is illustrated. The surface of the polymer material 14 facing the fixed arc current conductor 4b is flush with the surface of the movable arc current conductor 6c facing the fixed arc current conductor 4b.
The fixed arc current conductor 4b may be covered with the polymer material 14, and at least a part of at least one of the movable arc current conductor 6c and the fixed arc current conductor 4b may be covered with the polymer material 14.
Here, as a material used for the polymer material 14, polytetrafluoroethylene, polyacetal, acrylate copolymer, aliphatic hydrocarbon resin, polyvinyl alcohol, polybutadiene, polyvinyl acetate, polyvinyl acetal, isoprene resin, ethylene propylene Examples thereof include rubber, ethylene vinyl acetate copolymer, and polyamide resin.

  In the third embodiment configured as described above, by placing the polymer material 14 in the vicinity of the arc 9, the arc 9 comes into contact with the polymer material 14, so that the conductivity of the arc 9 is increased by the ablation effect. Since it falls and cools, interruption | blocking performance can be improved.

  According to the third embodiment of the present invention, while realizing miniaturization, the electromagnetic force for driving the arc can be increased so that the arc can be quickly moved to the arc extinguishing grid, reducing the damage on the contact and the arc. Can be quickly eliminated, and a small-sized switchgear with improved circuit safety and interruption performance can be obtained, and the first arc current conductor and the movable arc current conductor 6c made of the fixed arc current conductor 4b can be obtained. Since at least one part of at least one of the second arc current conductors made of is disposed so as to be covered with the polymer material, the interruption performance can be further improved.

  In addition, within this invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted within the scope of the invention.

1 case, 2 terminal part, 3 terminal part, 4 fixed contact, 4a fixed arc contact,
4b fixed arc current conductor, 4c contact pressure spring, 4d fixed energization contact, 4e fixed conductor, 5 conductor, 6 movable contact, 6a rotating shaft, 6b movable arc contact, 6c movable arc current conductor, 6d movable energization contact, 6e movable Conductor, 7 fixed side arc runner, 8 movable side arc runner, 9 arc, 10 arc extinguishing grid, 11 overcurrent detector, 12 drive mechanism, 13 magnetic body, 14 polymer material.

Claims (3)

  A first conductor portion having a cubic shape, a second conductor portion facing the first conductor portion, and a first conductor portion provided at a portion of the first conductor portion facing the second conductor portion. An opening recess provided together with the first current-carrying contact at a portion facing the current-carrying contact and the second conductor portion of the first conductor portion, and provided inside the opening recess in the first conductor portion. A second current-carrying contact provided at a portion of the first arc current conductor, a first arc contact provided in the first arc current conductor, and the first conductor portion of the second conductor portion. A second arc current conductor provided together with the second energizing contact at a portion of the second conductor portion facing the first conductor portion, and a second arc current conductor provided on the second arc current conductor. An arc contact and the first arc current conductor provided on the first arc current conductor; Arc extinguishing grid for extinguishing an arc generated between the arc arc contact and the second arc contact provided on the second arc current conductor, and for running the arc to the arc extinguishing grid The first and second conductor portions are provided by a drive mechanism portion that is provided with an arc runner and receives an opening command in a closed state where the first and second energizing contacts and the first and second arc contacts are in contact with each other. The first and second arc contacts that have been in contact with each other are brought into non-contact with the first and second current-carrying contacts that have been in contact with each other by moving them relatively. An arc is generated between the first and second arc contacts, and the first and second arc current conductors are generated between the first arc contact and the second arc contact. Through the arc An arc current path is formed, and the arcs are dissipated by a magnetic field generated by the magnetic field generated by the arc current path provided in parallel so as to circulate currents flowing through the arc current path in opposite directions. Each of the first and second arc current conductors constituting the arc current path has a sectional area of a contact surface between the first energizing contact and the second energizing contact. An opening and closing device characterized by being formed smaller than an area.   2. The switchgear according to claim 1, wherein at least a part of at least one of the first and second arc current conductors is arranged to be covered with a magnetic material.   The switchgear according to claim 1, wherein at least one of at least one of the first and second arc current conductors is arranged to be covered with a polymer material.

Images