JP2019087513A - Electrical switchgear - Google Patents

Abstract

To obtain an electrical switchgear having high reliability.SOLUTION: An electrical switchgear includes an opening and closing mechanism having a pair of contacts opening and closing freely, a first sidewall having a tabular first magnetic substance and a tabular first insulator placed on one principal surface of the first magnetic substance, while directing an opposite side to a front face, and placed while directing the front face of the first insulator toward a lateral side of the pair of contacts in an opening and closing direction, and a tabular second insulator placed on one principal surface of the second magnetic substance, while directing the face at the opposite side to the front face toward one principal surface of the second magnetic substance, and a second sidewall sandwiching the pair of contacts, and placed so that the front face of the first insulator and the front face of the second insulator face each other. Furthermore, the electrical switchgear includes a magnet placed at one direction side from positions of the pair of contacts, out of the directions along the first sidewall and the second sidewall, magnetizing the first and second magnetic substances, and forming a magnetic field in a space sandwiched by the first and second sidewalls.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a switchgear for conducting and interrupting current.

  In the conventional switchgear, when the pair of contacts are operated from the closed state to the open state in order to interrupt the current, arc discharge may occur between the pair of contacts. In this case, a magnetic field formed by a permanent magnet is applied to the arc discharge, and the arc discharge is stretched by the Lorentz force to extinguish the arc (for example, Patent Document 1).

JP 2015-88477

  In the conventional switchgear, when the arc discharge is extinguished, the arc discharge is extended in the direction in which the permanent magnet is disposed, and a part of the arc discharge sticks in the vicinity of the permanent magnet. At this time, there is a problem that the permanent magnet is demagnetized by the heat accompanying the arc discharge, and the number of opening and closing operations of the switching device is limited.

  The switchgear according to the present invention, which has been made to solve these problems, can suppress the demagnetization of a permanent magnet due to heat accompanying arc discharge, and can improve the number of switching operations as compared with the prior art. .

In the switchgear according to the present invention, an opening / closing mechanism having a pair of openable / closable contacts, a plate-shaped first magnetic body, and a main surface of the first magnetic body, a surface opposite to the surface A first side wall having a plate-like first insulator disposed facing the side, the first side wall having the surface of the first insulator facing the side in the opening / closing direction of the pair of contacts, A magnetic material of No. 2 and a plate-like second insulator whose surface opposite to the surface is disposed on the side of one main surface of the second magnetic material, sandwiching a pair of contacts, And a second side wall disposed such that the surface of the first insulator and the surface of the second insulator face each other.
Furthermore, in the switchgear according to the present invention, the first magnetic body and the second switch are disposed on one side from the position of the pair of contact points in the direction along the first side wall and the second side wall. And a magnet for magnetizing the magnetic substance of the above and forming a magnetic field in a space sandwiched between the first side wall and the second side wall.

  According to the present invention, it is possible to suppress the demagnetization of the permanent magnet due to the heat accompanying the arc discharge by extending the arc discharge in the direction to move away from the arrangement position of the permanent magnet. The number of times can be improved. That is, it is possible to provide a switchgear with high reliability.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the switchgear 100 or the switchgear 101 which concern on Embodiment 1 of this invention. It is a top view of arc extinguishing part 5 of a switchgear 100 concerning a Embodiment 1 of this invention, and a periphery. It is a perspective view of the switchgear 100 or the arc extinguishing part 5 of the switchgear 101 which concerns on Embodiment 1 of this invention. It is a top view which shows the direction of the line of magnetic force of each part of the switching device 100 which concerns on Embodiment 1 of this invention. It is a schematic diagram of the closed state of the movable contact 3 of the switching device 100 and the fixed contact 4 which concern on Embodiment 1 of this invention. It is a schematic diagram of the open state of the movable contact 3 and the fixed contact 4 of the switch | opening-closing apparatus 100 which concerns on Embodiment 1 of this invention. It is a figure which shows the track | orbit of the arc discharge in case the electric current of the arc discharge of the switchgear 100 which concerns on Embodiment 1 of this invention faces the paper surface upper direction to paper surface. It is a figure which shows the track | orbit of the arc discharge in case the electric current of the arc discharge of the switchgear 100 which concerns on Embodiment 1 of this invention turns to a paper surface downward from paper surface. It is a top view which shows the direction of the magnetic force line of each part of the switching device 101 which concerns on Embodiment 1 of this invention. It is a figure which shows the track | orbit of the arc discharge in case the electric current of the arc discharge of the switchgear 101 which concerns on Embodiment 1 of this invention turns to a paper surface downward from paper surface. It is a figure which shows the track | orbit of the arc discharge in case the electric current of the arc discharge of the switchgear 101 which concerns on Embodiment 1 of this invention turns to a paper surface downward from a paper surface. It is a figure which shows the plane of the arc extinguishing part 5c with which the switchgear based on Embodiment 2 of this invention is equipped, the direction of a magnetic field, and the track of extension of arc discharge. It is a figure which shows the plane of the arc extinguishing part 5d with which the switchgear based on Embodiment 2 of this invention is equipped, the direction of a magnetic field, and the track of extension of arc discharge. It is a figure which shows the plane of the arc extinguishing part 5e with which the switchgear based on Embodiment 3 of this invention is equipped, the direction of a magnetic field, and the track of extension of arc discharge. It is a figure which shows the plane of the arc extinguishing part 5f with which the switchgear based on Embodiment 4 of this invention is equipped, the direction of a magnetic field, and the track of extension of arc discharge. It is a figure which shows the plane of the arc extinguishing part 5g with which the switchgear based on Embodiment 5 of this invention is equipped, the direction of a magnetic field, and the track of extension of arc discharge. It is sectional drawing of the switch | opening-closing apparatus 102 based on Embodiment 6 of this invention. It is a top view of arc extinguishing part 5h of a switchgear 102 concerning embodiment of this invention 6, and a periphery. It is sectional drawing of the arc extinction part 5j with which the switch | opening-closing apparatus based on Embodiment 7 of this invention is equipped. It is sectional drawing of the arc extinguishing part 5k with which the switch | opening-closing apparatus based on Embodiment 7 of this invention is equipped.

Embodiment 1
1 to 11 show Embodiment 1 for carrying out the present invention.
First, the configuration of the switchgear 100 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a cross-sectional view of the switchgear 100, and FIG. 2 is a plan view of the arc extinguishing portion 5 and the periphery from the direction of the arrow A shown in FIG. Furthermore, FIG. 3 is a perspective view of the arc extinguishing portion 5.
Note that FIG. 1 doubles as a cross-sectional view of the switchgear 101 described in another embodiment 1 described later. In this case, instead of the arc extinguishing unit 5 incorporated in the switching device 100, the arc extinguishing portion 5b is incorporated in the switching device 101. Further, FIG. 3 also serves as a perspective view of the arc extinguishing portion 5 b built in the switching device 101.

Referring to FIG. 1, in the case 1 made of an insulating resin or the like, the movable contact 3, the fixed contact 4, the arc extinguishing portion 5, the first conductor 11, the second conductor 12, the first The terminal block 13, the second terminal block 14, and the connection conductor 17 are incorporated.
Furthermore, the inside of the case 1 is protected by covering the top of the case 1 with a cover 2 made of an insulating resin or the like.

The movable contact 3 is configured to be rotatable about the rotation shaft 32, and a movable contact 31 formed at one end of the movable contact 3 and a fixed contact 41 formed on the surface of the fixed contact 4 are a pair. Configure the contact point of
A drive mechanism portion and a relay portion (not shown) are disposed inside the case 1. The drive mechanism unit includes a mechanism for rotating the movable contact 3 around the rotation shaft 32 and opening and closing between the movable contact 31 and the fixed contact 41, and movable as described later by the supply of power by the operation of the relay unit. The opening and closing operations of the contact 31 and the fixed contact 41 are performed.

  Furthermore, the movable contact 3 is electrically connected to the connection conductor 17. The connection conductor 17 is electrically connected to the first conductor 11, and the first conductor 11 is electrically connected to the first terminal block 13. That is, the movable contact 31 of the movable contact 3 is electrically connected to the first terminal block 13.

  On the other hand, the fixed contact 4 is electrically connected to the second conductor 12. The second conductor 12 is electrically connected to the second terminal block 14. That is, the fixed contact 41 of the fixed contact 4 is electrically connected to the second terminal block 14.

In addition, generally, the switching device 100 is used in a state where it is connected to the first terminal block 13 and the second terminal block 14 to devices such as an external power source or a load.
One terminal (not shown) of the wiring connected to one external device is connected to the first terminal block 13. The terminal is disposed on the first terminal block 13, and the screw 15 is tightened and fixed to the first terminal block 13.
Similarly, one terminal (not shown) of the wiring connected to the other external device is connected to the second terminal block 14. This terminal is disposed on the second terminal block 14, and the screw 16 is tightened and fixed to the second terminal block 14.

  The fixed contact 41 is disposed in a space Ss between a first side wall 57 and a second side wall 58 constituting the arc extinguishing portion 5 described later, and the opening / closing direction of the movable contact 31 and the fixed contact 41 described later is , And a direction along the first side wall 57 and the second side wall 58.

Next, the structure of the arc extinguishing portion 5 will be described in detail with reference to FIGS. 2 and 3.
FIG. 2 shows the stationary contact 4 and the arc extinguishing portion 5. In addition, the arc extinguishing portion 5 includes the first magnetic body 51, the second magnetic body 52, the first insulator 53, the second insulator 54, the first magnet 55, the second magnet 56, the arc extinguishing plate 59, and the case 551. , And case 561.

  Referring to FIG. 2, the first magnetic body 51 is a plate-like magnetic body formed of iron, cobalt, nickel or the like. A first insulator 53 formed of a plate-like heat-resistant and insulating ceramic or the like is disposed on one main surface of the first magnetic body 51, and the first magnetic body 51 and the first insulator 53 Thus, the first side wall 57 is configured.

  Similar to the first magnetic body 51, the second magnetic body 52 is a plate-like magnetic body formed of iron, cobalt, nickel or the like. As in the first insulator 53, a second insulator 54 formed of a plate-like heat-resistant and insulating ceramic or the like is disposed on one main surface of the second magnetic member 52, The 52 and the second insulator 54 constitute a second side wall 58. The thickness tm indicates the plate thickness of the first magnetic body 51 and the second magnetic body 52.

The opening and closing direction of the fixed contact 41 and the movable contact 31 to be described later is generally in the upper and lower direction of the sheet of FIG. 2, and the first side wall 57 has the surface 53 f of the first insulator 53 in the lateral direction It is arranged to face.
Furthermore, the second side wall 58 is disposed so as to sandwich the fixed contact 41 and the movable contact 31, face the surface 54f of the second insulator 54, and face the first side wall 57. That is, the fixed contact 41 is disposed in the space Ss sandwiched by the first side wall 57 and the second side wall 58. The width Ws indicates the width of the space Ss.

Next, the position of the first magnet 55 and the position of the second magnet 56 will be described.
The direction a indicated by the arrow is one of the directions along the first side wall 57 and the second side wall 58. Furthermore, the direction b indicated by the arrow is a direction along the first side wall 57 and the second side wall 58 in the direction opposite to the direction a.
Furthermore, the alternate long and short dash line B is a line that is substantially perpendicular to the directions a and b, and bisects the switchgear 100, with the position of the fixed contact 41 as a base point.
A direction c indicated by an arrow is substantially perpendicular to the surface 53 f of the first insulator 53, and indicates a direction from the first magnetic body 51 to the first insulator 53. A direction d indicated by an arrow is substantially perpendicular to the surface 54 f of the second insulator 54 and indicates a direction from the second magnetic body 52 to the second insulator 54.

The first magnet 55 formed of a permanent magnet is disposed on the back surface 51 r of the first magnetic body 51 on the side of the alternate long and short dash line B in the direction a, and magnetizes the first magnetic body 51. Further, the arrow M1 indicates the magnetization direction of the first magnet 55, which is substantially the same as the direction c. The first magnet 55 is covered with a case 551 to protect it from impact, moisture and the like.
Similarly, the second magnet 56 formed of a permanent magnet is disposed on the back surface 52 r of the second magnetic body 52 on the side of the alternate long and short dash line B in the direction a, and magnetizes the second magnetic body 52. Further, the arrow M2 indicates the magnetization direction of the second magnet 56 and is substantially the same as the direction d. The second magnetic body 52 is covered with a case 561 to protect it from impact, moisture and the like.
The arc extinguishing plate 59 formed of a plurality of metal plates is disposed in the vicinity of the end of the first side wall 57 and the second side wall 58 on the side of the direction b. In other words, the arc extinguishing unit 5 includes the arc extinguishing plate 59 on the side of the direction b. When the arc discharge described later extends to the outside of the space Ss, the arc discharge is cooled to extinguish the arc discharge by increasing the resistance.

Next, with reference to FIG. 4, the magnetic field formed by the first magnet 55 and the second magnet 56 will be described.
FIG. 4 is a plan view showing the direction of the magnetic field of each part of the switchgear 100 according to Embodiment 1 of the present invention, and is a plan view from the same direction as FIG. In the drawing, the description of the fixed contact 4, the case 551, the case 561, and the arc extinguishing plate 59 is omitted.
Further, solid arrows in the space Ss and in the vicinity thereof indicate the direction of the magnetic field at the position in the drawing.

First, the direction of the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 will be described.
The direction f72 of the magnetic field inside the region S571 indicated by a dotted line near the first magnet 55 is the direction c. Furthermore, in the region on the side of the direction a from the region S571, the direction of the magnetic field is the direction f71 in which the component in the direction a is superimposed on the component in the direction c. In the region on the side of the direction b from the region S571, the direction of the magnetic field is the direction f73 in which the component in the direction b is superimposed on the component in the direction c.
Furthermore, the direction of the magnetic field is a direction in which the component in the direction b is superimposed on the component in the direction c similarly in the inside of the region S572 indicated by the dotted line on the side of the alternate long and short dash line B in the direction b.

  In other words, the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction from the first magnetic body 51 to the first insulator 53 with the components in the direction a or the direction b overlapping depending on the position. .

Furthermore, the direction of the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 will be described.
The direction f82 of the magnetic field inside the region S581 shown by a dotted line near the second magnet 56 is the direction d. Furthermore, in the region on the side of the direction a from the region S581, the direction of the magnetic field is the direction f81 in which the component of the direction a is superimposed on the component of the direction d. The direction of the magnetic field on the side of the direction b from the region S581 is the direction f83 in which the component of the direction b is superimposed on the component of the direction d. Furthermore, the direction of the magnetic field is the direction in which the component in the direction b is superimposed on the component in the direction d similarly in the inside of the region S 582 indicated by the dotted line on the side of the alternate long and short dash line B in the direction b.

  In other words, the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 is a direction in which the components in the direction a or the direction b overlap depending on the position and are directed from the second magnetic body 52 to the second insulator 54 .

  Furthermore, the direction of the magnetic field at the position of the fixed contact 41 and the area S411 in the vicinity thereof is the direction b. The direction of the magnetic field inside the region Ssc indicated by the dotted line from the side of the direction b of the region S411 to the vicinity of the end of the first side wall 57 (and the second side wall 58) is the direction b.

In the region sandwiched between the region Ssc and the region S572, the component of the magnetic field in the direction c becomes larger as going from the region Ssc to the region S572.
Similarly, in the region sandwiched between the region Ssc and the region S582, the component of the magnetic field in the direction d becomes larger as going from the region Ssc to the region S582.

  Furthermore, from the space Ss on the side of the direction b, the direction of the magnetic field in the region Sbs outside is substantially in the direction b. The component of the magnetic field in the direction c is superimposed on the side of the direction d inside the region Sbs, and the component of the magnetic field in the direction d is superimposed on the side of the direction c inside the region Sbs.

  Next, the operation of the switchgear 100 according to Embodiment 1 will be described with reference to FIGS. 5 and 6. In the drawing, the movable contact 3 and the fixed contact 4 are shown in the portion shown in FIG. FIG. 5 is a schematic view of the switching device 100 and shows a closed state, and FIG. 6 is a schematic view of the switching device 100 and shows an open state.

The closed state of the switchgear 100 will be described with reference to FIG.
The closed state of the opening / closing device 100 is a state where the movable contact 3 is rotated about the rotation shaft 32 from the open state described later, and the movable contact 31 and the fixed contact 41 are in contact. In the closed state, the movable contact 3 and the fixed contact 4 are electrically connected via the movable contact 31 and the fixed contact 41. When a voltage is applied between the first terminal block 13 and the second terminal block 14, a current flows between the movable contact 31 and the fixed contact 41.

Further, the open state of the opening / closing device 100 will be described with reference to FIG.
The open state of the switching device 100 is a state in which the movable contact 3 is rotated about the rotation shaft 32 from the closed state described above, and the movable contact 31 and the fixed contact 41 are separated. In the open state, the movable contact 3 and the fixed contact 4 are electrically isolated.

However, if a voltage is applied between the first terminal block 13 and the second terminal block 14 and a current flows between the movable contact 31 and the fixed contact 41, immediately after operating from the closed state to the open state. Arc discharge may occur between the movable contact 31 and the fixed contact 41.
Although the details will be described later, Lorentz force acts on the arc discharge by the magnetic field formed by the first magnet 55 and the second magnet 56, and the arc discharge is extended and extinguished.

Path D1, path D2, and path D3 in the figure indicate paths of the arc discharge after the time when the arc discharge extends.
First, an arc discharge is drawn between the movable contact 31 and the fixed contact 41 in the path D1, and is drawn in the paths D2 and D3 over time. In other words, the arc discharge is stretched in the direction b. When the arc discharge is extended and extinguished, the movable contact 3 and the fixed contact 4 are electrically insulated.

  Further, the opening and closing direction in the first embodiment includes all tangential directions of the track e of the movable contact 31 when the movable contact 3 rotates around the rotation axis 32.

Next, referring to FIGS. 7 and 8, when arc discharge occurs between movable contact 31 and fixed contact 41, Lorentz force acts on the arc discharge, and this arc discharge extinguishes mechanism. Will be described in detail.
7 and 8 show plan views in the same manner as FIG. FIG. 7 shows the case where the direction of the current by the arc discharge is from the bottom of the paper to the paper, and FIG. 8 shows the case where the direction of the current by the arc discharge is from the paper to below the paper.

First, with reference to FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing will be described.
The position C11 indicates the initial position where arcing occurs and is generally above the fixed contact 41. The trajectory K1 indicates a trajectory in the extending direction of the arc discharge, and the position C12 indicates a position in the middle of the trajectory K1.

Initially, it is assumed that the switching device 100 is in the closed state, and current flows from the second terminal block 14 toward the first terminal block 13 via the movable contact 31 and the fixed contact 41.
After that, the open / close device 100 operates from the closed state to the open state according to a shutoff instruction from the outside. At this time, arc discharge occurs at the position C11. The direction of the current due to the arc discharge is from the bottom of the drawing to the top of the drawing.
As described above, since the direction of the magnetic field is the direction b inside the region S411, according to Fleming's left-hand rule, the Lorentz force is perpendicular to the arc discharge in the direction b and to the direction F11 facing the second sidewall 58. Works. Therefore, the arc discharge initially extends toward the second side wall 58.

Furthermore, when the arc discharge extends to the outside of the region S411, the arc discharge also exerts Lorentz force in the direction b due to the influence of the component in the direction d of the magnetic field. That is, as shown in the position C12, the Lorentz force acts in the direction F12. In other words, while being pressed against the second insulator 54, the arc discharge extends in the direction b following the trajectory K1. At this time, since the surface 54f of the second insulator 54 is exposed to arc discharge accompanied by heat, the second insulator 54 needs to have heat resistance and insulation.
Depending on the extension length of the arc discharge, the arc resistance which is the resistance between both ends of the arc discharge increases, the voltage between both ends of the arc discharge can not be maintained, and the arc discharge extinguishes.

Next, referring to FIG. 8, the case where the direction of the current due to the arc discharge is from the top of the drawing to the bottom of the drawing is shown.
As in FIG. 7, the position C11 indicates the initial position where arcing occurs and is generally above the fixed contact 41. The trajectory K2 indicates a trajectory in the extending direction of the arc discharge, and the position C22 indicates a position in the middle of the trajectory K2.

Initially, it is assumed that the switching device 100 is in the closed state, and current flows from the first terminal block 13 toward the second terminal block 14 via the movable contact 31 and the fixed contact 41.
After that, the open / close device 100 operates from the closed state to the open state according to a shutoff instruction from the outside. At this time, arc discharge occurs at the position C11. The direction of the current due to the arc discharge is from the top of the drawing to the bottom of the drawing.
As described above, in the region S411, since the direction of the magnetic field is the direction b, according to Fleming's left-hand rule, the Lorentz force is perpendicular to the arc discharge in the direction b and acts in the direction F21 facing the first side wall 57. . Therefore, the arc discharge initially extends toward the first side wall 57.

Furthermore, when the arc discharge extends to the outside of the region S411, the component of the direction c of the magnetic field causes the arc discharge to exert Lorentz force also in the direction b. That is, as shown in the position C22, the Lorentz force acts in the direction F22. In other words, while being pressed against the first insulator 53, the arc discharge extends in the tracking direction b along the trajectory K2.
Depending on the extension length of the arc discharge, the arc resistance increases, the voltage across the arc discharge can not be maintained, and the arc discharge extinguishes.

  In the case of the switching device 100, the arc extinguishing plate 59 is disposed at the end where the arc discharge extends. When the arc discharge does not extinguish before reaching the extinguishing plate 59, the arc discharge collides with the extinguishing plate 59, is cooled and extinguishes.

  In the switchgear 100, since the arc discharge is drawn in the direction away from the first magnet 55 and the second magnet 56 and is extinguished, the heat accompanying the arc discharge causes the demagnetization of the first magnet 55 and the second magnet 56. It becomes possible to suppress.

Next, the configuration of the switchgear 101 according to the first embodiment different from the above-described switchgear 100 will be described with reference to FIGS. 1, 3 and 9 to 11.
As described above, FIG. 1 doubles as a cross-sectional view of the switchgear 100 and the switchgear 101. The arc extinguishing unit 5 b is incorporated in the switching device 101. Further, FIG. 3 also serves as a perspective view of the arc extinguishing portion 5 b built in the switching device 101.

  Furthermore, since the magnetizing directions of the first magnet 55r and the second magnet 56r described later are different for the first magnet 55 and the second magnet 56 of the switchgear 100, the switchgear 101 is different from the switchgear 100 also in the magnetic field to be formed. .

FIG. 9 is a plan view showing the direction of the magnetic field of each part of the switchgear according to Embodiment 1 of the present invention. Solid arrows in and near the space Ss in the figure indicate the direction of the magnetic field, as in FIG. FIG. 10 shows the case where the direction of the current by the arc discharge is from the bottom of the paper to the paper, and FIG. 11 shows the case where the direction of the current by the arc discharge is from the paper to below the paper.
Note that the same symbols and symbols as those in FIGS. 1 to 8 in the drawings are the same as or equivalent to those of the switching device 100, and thus detailed description will be omitted.

The configuration of the switching device 101 will be described with reference to FIG.
A direction cr indicated by an arrow in the drawing is substantially perpendicular to the surface 53 f of the first insulator 53, and indicates a direction from the first insulator 53 to the first magnetic body 51. In other words, the direction cr is the direction opposite to the direction c. A direction dr indicated by an arrow is substantially perpendicular to the surface 54 f of the second insulator 54 and indicates a direction from the second insulator 54 toward the second magnetic body 52. In other words, the direction dr is the direction opposite to the direction d.

The first magnet 55r of the switching device 101 is the same as or equivalent to the mounting position and material of the first magnet 55 of the switching device 100, but the magnetization direction is different. The arrow M1r indicates the magnetization direction of the first magnet 55r, and is substantially the same as the direction cr.
Similarly, the second magnet 56r of the switching device 101 is the same as or the same as the mounting position and material of the second magnet 56 of the switching device 100, but the magnetization direction is different. The arrow M2r indicates the magnetization direction of the second magnet 56r, and is substantially the same as the direction dr.

Next, the direction of the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 will be described.
The direction f72r of the magnetic field inside the region S571 indicated by a dotted line near the first magnet 55r is the direction cr. Furthermore, in the region on the side of the direction a from the region S571, the direction of the magnetic field is the direction f71 in which the component in the direction b is superimposed on the component in the direction cr. In the region on the side of the direction b from the region S571, the direction of the magnetic field is the direction f73r in which the component in the direction a is superimposed on the component in the direction cr.
Furthermore, the direction of the magnetic field is a direction in which the component in the direction a is superimposed on the component in the direction cr similarly in the inside of the region S572 indicated by the dotted line on the side of the alternate long and short dash line B in the direction b.

  In other words, the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction from the first insulator 53 to the first magnetic body 51 with the components in the direction a or the direction b overlapping depending on the position. .

Next, the direction of the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 will be described.
The direction f82r of the magnetic field inside the region S581 indicated by a dotted line near the second magnet 56r is the direction dr. Furthermore, in the region on the side of the direction a from the region S581, the direction of the magnetic field is the direction f81r in which the component in the direction b is superimposed on the component in the direction dr. The direction of the magnetic field on the side of the direction b from the region S581 is a direction f83r in which the component of the direction a is superimposed on the component of the direction dr. Furthermore, the direction of the magnetic field is a direction in which the component in the direction a is superimposed on the component in the direction dr similarly in the inside of the region S582 indicated by the dotted line on the side of the alternate long and short dash line B in the direction b.

  In other words, the magnetic field in the vicinity of the surface 54f and the surface 54f of the second insulator 54r is a direction from the second insulator 54 toward the second magnetic body 52, with the components in the direction a or the direction b overlapping depending on the position. .

  Furthermore, the direction of the magnetic field at the position of the fixed contact 41 and the area S411 in the vicinity thereof is the direction a. The direction of the magnetic field in the region Ssc indicated by the dotted line from the side of the direction b of the region S411 to the vicinity of the end of the first side wall 57 (and the second side wall 58) is the direction a.

In the region sandwiched between the region Ssc and the region S572, the component of the magnetic field in the direction cr becomes larger as going from the region Ssc to the region S572.
Similarly, in the region sandwiched between the region Ssc and the region S582, the component of the magnetic field in the direction dr increases as going from the region Ssc to the region S582.

  Furthermore, the direction of the magnetic field in the region Sbs from the space Ss on the side of the direction b generally faces the direction a. The component of the magnetic field in the direction dr is superimposed on the side of the direction dr in the region Sbs, and the component of the magnetic field in the direction cr is superimposed on the side of the direction cr in the region Sbs.

Next, referring to FIGS. 10 and 11, when arc discharge occurs between movable contact 31 and fixed contact 41, a Lorentz force acts on the arc discharge, and the mechanism of arc extinction of the arc discharge. Will be described in detail.
First, with reference to FIG. 10, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing will be described.

Initially, the switching device 101 is in the closed state, and it is assumed that current flows from the second terminal block 14 toward the first terminal block 13 via the movable contact 31 and the fixed contact 41.
Thereafter, the open / close device 101 operates from the closed state to the open state in response to a shutoff instruction from the outside. At this time, arc discharge occurs at the position C11. The direction of the current by the arc discharge is from the bottom of the paper to the top of the paper.
As described above, in the region S411, since the direction of the magnetic field is the direction a, according to Fleming's left-hand rule, the Lorentz force acts on the arc discharge in the direction F21r perpendicular to the direction a and facing the first sidewall 57. Do. Therefore, the arc discharge initially extends toward the first side wall 57.

Furthermore, when the arc discharge extends outside the region S411, the arc discharge also acts in the direction b due to the influence of the component of the direction cr of the magnetic field. That is, as shown in the position C13, the Lorentz force acts on the direction F22r. In other words, while being pressed against the first insulator 53, the arc discharge extends in the tracking direction b following the track K2r.
Depending on the extension length of the arc discharge, the arc resistance increases, the voltage across the arc discharge can not be maintained, and the arc discharge extinguishes.

Next, referring to FIG. 11, the case where the direction of the current due to the arc discharge is from the top of the drawing to the bottom of the drawing is shown.
Initially, the switching device 101 is in the closed state, and it is assumed that current flows from the first terminal block 13 toward the second terminal block 14 via the movable contact 31 and the fixed contact 41.
Thereafter, the open / close device 101 operates from the closed state to the open state in response to a shutoff instruction from the outside. At this time, arc discharge occurs at the position C11. The direction of the current due to the arc discharge is from the top of the paper to the bottom of the paper.
As described above, in the region S411, since the direction of the magnetic field is the direction a, according to Fleming's left-hand rule, the Lorentz force acts on the arc discharge in the direction F11r perpendicular to the direction a and facing the second sidewall 58. Do. Therefore, the arc discharge initially extends toward the second side wall 58.

Furthermore, when the arc discharge extends to the outside of the region S411, the arc discharge also acts in the direction b due to the influence of the component of the direction dr of the magnetic field. That is, as shown in the position C23, the Lorentz force acts on the direction F12r. In other words, while being pressed against the first insulator 53, the arc discharge extends in the tracking direction b following the track K1r.
Depending on the extension length of the arc discharge, the arc resistance increases, the voltage across the arc discharge can not be maintained, and the arc discharge extinguishes.

  In the case of the switching device 101, the arc extinguishing plate 59 is disposed at the end where the arc discharge extends. When the arc discharge does not extinguish before reaching the arc extinguishing plate 59, the arc discharge collides with the extinguishing plate 59, is separated and extinguishes.

  That is, as in the case of the switchgear 100, the switchgear 101 extends the arc discharge to the first magnet 55r and the second magnet 56r in the direction away from each other and extinguishes the arc, so the heat accompanying the arc discharge causes the first magnet 55r to It is possible to suppress the demagnetization with the second magnet 56r.

  As described above, according to the first embodiment, it is possible to suppress the demagnetization of the first magnet and the second magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Second Embodiment
In the second embodiment, in order to promote the extension of the arc discharge, an embodiment in which the induction magnet 61 is provided will be described. Furthermore, in another embodiment 2, the form provided with the attraction bar 64 will be described.
By arranging the attraction magnet 61 and the attraction bar 64, it is possible to accelerate the extension of the arc discharge and to extinguish the arc discharge rapidly.

FIG. 12 is a plan view of the arc extinguishing portion 5c provided in the switchgear of the second embodiment, and describes a locus in the direction in which the arc discharge is extended and a direction of the magnetic field when the arc discharge occurs.
The switchgear including the arc extinguishing portion 5c is substantially equivalent to the switchgear 100, and the arc extinguishing portion 5c is disposed instead of the arc extinguishing portion 5.
Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.
Similarly, solid arrows drawn in and near the space Ss in the figure indicate the direction of the magnetic field. Further, as in the case of FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing is shown.

  The arc extinguishing portion 5c includes a first magnetic body 51, a second magnetic body 52, a first insulator 53, a second insulator 54, a first magnet 55, a second magnet 56, a case 551, a case 561, a solicitation magnet 61 and case 661.

First, with reference to FIG. 12, the structure of the arc extinguishing portion 5c will be described in detail.
The induction magnet 61 is disposed outward from the space Ss on the side of the direction b. In other words, the arc extinguishing unit 5c includes the induction magnet 61 on the side of the direction b.
Further, the arrow Ma indicates the magnetization direction of the induction magnet 61 and is substantially the same as the direction b. The induction magnet 61 is covered with a ceramic case 611 having heat resistance and insulation to protect it from heat and current due to arc discharge.

Further, the operation of the induction magnet 61 will be described.
The installation of the induction magnet 61 enhances the strength of the magnetic field. In particular, since the strength of the magnetic field in the direction b from the alternate long and short dash line B in the space Ss is enhanced, the generated arc discharge follows the path K1 and is rapidly stretched. That is, the arc discharge can be extinguished rapidly.

FIG. 13 is a plan view of the arc extinguishing portion 5d provided in the switch device according to another embodiment 2 of the present invention, showing the locus of the arc discharge in the extending direction and the direction of the magnetic field when the arc discharge occurs. .
The switchgear including the arc extinguishing portion 5d is substantially equivalent to the switchgear 100, and the arc extinguishing portion 5d is disposed instead of the arc extinguishing portion 5.

Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.
Similarly, solid arrows drawn in and near the space Ss in the figure indicate the direction of the magnetic field. Further, as in the case of FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing is shown.

  The arc extinguishing portion 5 d includes the first magnetic body 51, the second magnetic body 52, the first insulator 53, the second insulator 54, the first magnet 55, the second magnet 56, the case 551, the case 561, the attraction bar 64. , And case 641.

First, the structure of the arc extinguishing portion 5d will be described in detail with reference to FIG.
The attraction bar 64 has a structure in which the attraction magnetic body 63 is connected to the main surface of the attraction magnet 62. Furthermore, the attraction bar 64 is covered with a ceramic case 641 having heat resistance and insulation to protect against heat and current due to arc discharge.

  Furthermore, the portion including the tip of the magnetic attraction body 63 that constitutes the magnetic attraction bar 64 is located between the magnetic attraction body 63 and the first insulator 53 and in the magnetic flux within the space Ss on the side of the direction b. A space where an arc discharge is extended is provided between the body 63 and the second insulator 54, and the other part constituting the attraction bar 64 is provided outside the space Ss on the side of the direction b. In other words, the arc extinguishing portion 5 d includes the attractor bar 64 on the side of the direction b. The arrow Ma indicates the magnetization direction of the induction magnet 62 in the same manner as the induction magnet 61 and is substantially the same as the direction b.

Next, the action of the attraction bar 64 will be described.
The installation of the attraction bar 64 enhances the strength of the magnetic field. In particular, since the strength of the magnetic field in the direction b from the alternate long and short dash line B in the space Ss is enhanced, the generated arc discharge follows the path K1 and is rapidly stretched. That is, the arc discharge can be extinguished rapidly.

  As described above, according to the second embodiment, the arc discharge can be extinguished rapidly. Furthermore, as in the first embodiment, it is possible to suppress the demagnetization of the first magnet and the second magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Third Embodiment
Embodiment 1 and 2 demonstrated the form provided with two permanent magnets, a 1st magnet and a 2nd magnet. In the third embodiment, an embodiment in which only one third permanent magnet is provided will be described. Since the number of permanent magnets is one, the switchgear shown in the third embodiment can shorten the manufacturing time as compared with the switchgear shown in the first embodiment and can also reduce the manufacturing cost.

FIG. 14 is a plan view of the arc extinguishing portion 5e provided in the switchgear of the third embodiment, which describes a locus in the direction in which the arc discharge is extended and a direction of the magnetic field when the arc discharge occurs.
The switchgear having the arc extinguishing portion 5e is substantially equivalent to the switchgear 100, and the arc extinguishing portion 5e is disposed instead of the arc extinguishing portion 5.

Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.
Similarly, solid arrows drawn in and near the space Ss in the figure indicate the direction of the magnetic field. Further, as in the case of FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing is shown.

  The arc extinguishing portion 5e includes a first magnetic body 51, a second magnetic body 52, a first insulator 53, a second insulator 54, a third magnet 74, a third magnetic body 71, a third insulator 72, and a case. Including 741.

The structure of the arc extinguishing portion 5e will be described in detail with reference to FIG.
The third magnetic body 71 is connected to an end of the first magnetic body 51 in the direction b and an end of the second magnetic body 52 in the direction a. Similar to the first magnetic body 51 and the second magnetic body 52, the third magnetic body 71 is a plate-like magnetic body formed of iron, cobalt, nickel or the like.
Further, on the surface of the third magnetic body 71 in the direction b, the third insulator 72 formed of a plate-like heat-resistant and insulating ceramic or the like is disposed, and the third magnetic body 71 and the third magnetic body 71 are arranged. The insulator 72 and the third side wall 73 are formed.

  Furthermore, the third magnet 74 is disposed on the back surface 71 r of the third magnetic body 71. The third magnet 74 is covered with a case 741 to protect it from impact, moisture and the like. The arrow M3 indicates the magnetization direction of the third magnet 74, and is substantially the same as the direction b.

Next, the magnetic field formed by the third magnet 74 will be described.
The direction of the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction in which the component in the direction b is superimposed on the component in the direction c. In other words, the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction in which the components in the direction b are superimposed and directed from the first magnetic body 51 to the first insulator 53.

  Furthermore, the direction of the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 is a direction in which the component in the direction b is superimposed on the component in the direction d. In other words, the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 is a direction in which the components in the direction b overlap and are directed from the second magnetic body 52 to the second insulator 54.

  The direction of the magnetic field in the vicinity of the surface 72 f and the surface 72 f of the third insulator 72 is substantially the direction b. In other words, the magnetic field in the vicinity of the surface 72 f and the surface 72 f of the third insulator 72 is in the direction from the third magnetic body 71 to the third insulator 72.

  Furthermore, the direction of the magnetic field at the position (not shown) of the fixed contact 41 and the area S411 in the vicinity thereof is the direction b. The direction of the magnetic field in the region Ssc from the side of the direction b of the region S411 to the vicinity of the end of the first side wall 57 (and the second side wall 58) is the direction b.

In the region sandwiched between the region Ssc and the surface 53f of the first insulator 53, the component of the magnetic field in the direction c becomes larger as it goes from the region Ssc to the surface 54f of the second insulator 54.
Similarly, in a region sandwiched between the region Ssc and the surface 54f of the second insulator 54, the component of the magnetic field in the direction d becomes larger as going from the region Ssc to the region S582.

  Furthermore, from the space Ss on the side of the direction b, the direction of the magnetic field in the region Sbs outside is substantially in the direction b. The component of the magnetic field in the direction c is superimposed on the side of the direction d inside the region Sbs, and the component of the magnetic field in the direction d is superimposed on the side of the direction c inside the region Sbs.

In other words, on the side of direction b from the alternate long and short dash line B of the arc extinguishing portion 5e included in the switch of the third embodiment, the direction of the magnetic field is substantially the same as that of the arc extinguishing portion 5 of the first embodiment.
Further, as in the case of the first embodiment, when arc discharge occurs, the arc discharge follows the trajectory K1 and is extended. That is, arc discharge can be extinguished.

  As described above, according to the third embodiment, since the number of permanent magnets is one, the manufacturing time can be shortened and the manufacturing cost can be reduced as compared with the switchgear shown in the first embodiment. .

Furthermore, as in the first embodiment, the arc discharge can be extinguished, and it is possible to suppress the demagnetization with the third magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Fourth Embodiment
Embodiment 1 and 2 demonstrated the form provided with two permanent magnets, a 1st magnet and a 2nd magnet. Moreover, Embodiment 3 demonstrated the form provided with one permanent magnet of only a 3rd magnet. In the fourth embodiment, an embodiment in which three permanent magnets of a first magnet, a second magnet, and a third magnet are provided will be described.
A strong magnetic field can be formed by the first magnet, the second magnet, and the third magnet to promote the extension of the arc discharge and to extinguish the arc discharge rapidly.

FIG. 15 is a plan view of the arc extinguishing portion 5f included in the switching device of the fourth embodiment, which describes a locus in the direction in which the arc discharge is extended and a direction of the magnetic field when the arc discharge occurs.
The switchgear including the arc extinguishing portion 5f is substantially equivalent to the switchgear 100, and the arc extinguishing portion 5f is disposed instead of the arc extinguishing portion 5.

Further, the same symbols and symbols as in FIGS. 1 to 11 and 14 in the drawings are the same as or equivalent to those in Embodiment 1 and Embodiment 3, so detailed description will be omitted.
Similarly, solid arrows drawn in and near the space Ss in the figure indicate the direction of the magnetic field. Further, as in the case of FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing is shown.

  The arc extinguishing portion 5f includes a first magnetic body 51, a second magnetic body 52, a first insulator 53, a second insulator 54, a first magnet 55, a second magnet 56, a third magnet 74, and a third magnetic body. 71, a third insulator 72, and a case 741.

The magnetic field formed by the first magnet 55, the second magnet 56, and the third magnet 74 will be described.
The direction of the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction in which the component in the direction b is superimposed on the component in the direction c. In other words, the magnetic field in the vicinity of the surface 53 f and the surface 53 f of the first insulator 53 is a direction in which the components in the direction b are superimposed and directed from the first magnetic body 51 to the first insulator 53.

  Furthermore, the direction of the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 is a direction in which the component in the direction b is superimposed on the component in the direction d. In other words, the magnetic field in the vicinity of the surface 54 f and the surface 54 f of the second insulator 54 is a direction in which the components in the direction b overlap and are directed from the second magnetic body 52 to the second insulator 54.

  The direction of the magnetic field in the vicinity of the surface 72 f and the surface 72 f of the third insulator 72 is substantially the direction b. In other words, the magnetic field in the vicinity of the surface 72 f and the surface 72 f of the third insulator 72 is in the direction from the third magnetic body 71 to the third insulator 72.

  Furthermore, the direction of the magnetic field at the position (not shown) of the fixed contact 41 and the area S411 in the vicinity thereof is the direction b. The direction of the magnetic field in the region Ssc from the side of the direction b of the region S411 to the vicinity of the end of the first side wall 57 (and the second side wall 58) is the direction b.

In the region sandwiched between the region Ssc and the surface 53f of the first insulator 53, the component of the magnetic field in the direction c becomes larger as it goes from the region Ssc to the surface 53f of the first insulator 53.
Similarly, in the region sandwiched between the region Ssc and the surface 54f of the second insulator 54, the component of the magnetic field in the direction d becomes larger as going from the region Ssc to the surface 54f of the second insulator 54.

  Furthermore, from the space Ss on the side of the direction b, the direction of the magnetic field in the region Sbs outside is substantially in the direction b. The component of the magnetic field in the direction c is superimposed on the side of the direction d inside the region Sbs, and the component of the magnetic field in the direction d is superimposed on the side of the direction c inside the region Sbs.

That is, the direction of the magnetic field of the arc extinguishing portion 5f provided in the switch of the fourth embodiment has a direction of the magnetic field substantially the same as that of the third embodiment.
Furthermore, by providing three permanent magnets of the first magnet 55, the second magnet 56, and the third magnet 74, the strength of the magnetic field is enhanced. In particular, since the strength of the magnetic field in the direction b from the alternate long and short dash line B in the space Ss is enhanced, the generated arc discharge follows the path K1 and is rapidly stretched. That is, the arc discharge can be extinguished rapidly.

  Furthermore, as in the first embodiment, it is possible to suppress the demagnetization of the first magnet, the second magnet, and the third magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Embodiment 5
In the fifth embodiment, the first magnetic body 51 b and the second magnetic body 52 b will be described as having a structure having a portion (curved portion 51 bc, curved portion 52 bc) bent in the direction b.
By this structure, the magnetic resistance of the magnetic circuit formed between the first magnetic body 51b and the first magnet 55 can be reduced, and the end 52be of the second magnetic body 52b is similarly made of the second magnet 56. The reluctance of the magnetic circuit formed between can be reduced. As a result, the magnetic flux density leaking from the magnetic body can be maintained high even at the extension destination (direction b) of the arc, and the extension of the arc discharge can be promoted to rapidly extinguish the arc discharge.

FIG. 16 is a plan view of the arc extinguishing portion 5g provided in the switching device of the fifth embodiment, which describes a locus in the direction in which the arc discharge is extended and a direction of the magnetic field when the arc discharge occurs.
The switchgear including the arc extinguishing portion 5g is substantially equivalent to the switchgear 100, and the arc extinguishing portion 5g is disposed instead of the arc extinguishing portion 5.

Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.
Similarly, solid arrows drawn in and near the space Ss in the figure indicate the direction of the magnetic field. Further, as in the case of FIG. 7, the case where the direction of the current due to the arc discharge is from the bottom of the drawing to the drawing is shown.

The structure of the arc extinguishing portion 5g will be described in detail with reference to FIG.
The portion of the first magnetic body 51b surrounded by the dotted line indicates the curved portion 51bc of the first magnetic body 51b. The first magnetic body 51b is bent in the direction opposite to the direction c at the position of the curved portion 51bc, and the end 51be of the first magnetic body 51b approaches the first magnet 55. In other words, the end 51be is set closer to the first magnet 55 than the position of the curved portion 51bc.
Similarly, a portion of the second magnetic body 52b surrounded by a dotted line indicates a curved portion 52bc of the second magnetic body 52b. At the position of the curved portion 52bc, the second magnetic body 52b is bent in the direction opposite to the direction d, and the end 52be of the second magnetic body 52b approaches the second magnet 56. In other words, the end 52be is set closer to the second magnet 56 than the position of the curved portion 52bc.

  By bringing the end 51be into close proximity to the first magnet 55, the magnetic resistance of the magnetic circuit formed between the first magnetic body 51b and the first magnet 55 can be reduced. Similarly, the proximity of the end 52be and the second magnet 56 can reduce the magnetic resistance of the magnetic circuit formed between the first magnetic body 51b and the second magnet 56. As a result, the magnetic flux density leaking from the magnetic body can be maintained high even at the arc extension destination (direction b). Therefore, when arc discharge occurs, extension of the arc discharge can be promoted and the arc discharge can be extinguished rapidly.

Furthermore, the structure which makes magnetic flux density of space Ss high is demonstrated.
The distance between the end 51be and the back surface 55n of the first magnet 55 (the surface opposite to the surface facing the first magnetic body 51b) is a distance Lm1. The end 52be and the back surface 56n of the second magnet 56 (second magnetic body) The distance between 52b and the opposite surface to the opposite surface is taken as a distance Lm2. Furthermore, let the space | interval of the 1st magnetic body 51b and the 2nd magnetic body 52b be the space | interval Lb.
The interval Lb is set to be longer than the interval Lm1 and the interval Lm2. Thereby, the interference between the magnetic field formed by the first magnet 55 and the magnetic field formed by the second magnet 56 can be reduced, so that the magnetic flux density of the space Ss can be formed more stably. Therefore, when arc discharge occurs, extension of the arc discharge can be further promoted to extinguish the arc discharge rapidly.

  As described above, according to the fifth embodiment, the arc discharge can be extinguished rapidly. Furthermore, as in the first embodiment, it is possible to suppress the demagnetization of the first magnet and the second magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Sixth Embodiment
In the first to fifth embodiments, the movable contact 31 and the fixed contact 41 constitute a pair of contacts, and the pair of contacts has explained the opening / closing device that executes the opening / closing operation.
In the sixth embodiment, an embodiment will be described in which two contacts are provided and these contacts are simultaneously opened and closed.

FIG. 17 is a cross-sectional view of the switchgear 102 according to the sixth embodiment, and FIG. 18 is a plan view of the arc extinguishing portion 5h and its periphery from the direction of the arrow A2 shown in FIG.
Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.

The structure of the switchgear 102 will be described with reference to FIG.
An electromagnetic drive control unit 81 is incorporated in the case 1 b and the case 1 c made of an insulating resin or the like. The electromagnetic drive control unit 81 is connected to one end of an insulating rod 82 made of an insulating material, and has a mechanism for moving the insulating rod 82 up and down.
Furthermore, the insulating rod 82 passes through the case 1c, and the other end of the insulating rod 82 is connected to the movable contact 3b.

The movable contact 3 b includes a movable contact 31 b at one end and a movable contact 31 c at the other end. That is, the movable contact 31b and the movable contact 31c are electrically connected. The fixed contact 4b has a fixed contact 41b at one end thereof, and the fixed contact 4c has a fixed contact 41c at one end thereof.
The movable contact 31b and the fixed contact 41b constitute a pair of contacts, and similarly, the movable contact 31c and the fixed contact 41c constitute a pair of contacts. That is, by moving the insulating rod 82 up and down, the two pairs of contacts are provided with a mechanism that simultaneously operates from the open state to the closed state and simultaneously operates from the closed state to the open state.

  The arc extinguishing portion 5 h includes a first magnetic body 51, a second magnetic body 52, a first insulator 53, a second insulator 54, a first magnet 55, and a second magnet 56. Furthermore, the arc extinguishing portion 5h, the fixed contact 41b, the fixed contact 4c, and the insulating rod 82 are protected by covering the top of the case 1c with a cover 2b made of an insulating resin or the like.

Next, with reference to FIG. 18, the structure of the arc extinguishing portion 5h and the periphery will be described in detail.
The opening and closing directions of the fixed contact 41b and the movable contact 31b and the opening and closing directions of the fixed contact 41c and the movable contact 31c are substantially in the upper and lower directions of the sheet of FIG. 53f is disposed to the side of these opening and closing directions.
Furthermore, the second side wall 58 is disposed so as to face the first side wall 57 with the surface 54f of the second insulator 54 facing and sandwiching the fixed contact 41b and the movable contact 31b, and the fixed contact 41c and the movable contact 31c. .

Next, the position of the first magnet 55 and the position of the second magnet 56 will be described.
The alternate long and short dash line B1 is substantially perpendicular to the directions a and b, with the position of the fixed contact 41b as a base point. Similarly, the alternate long and short dash line B2 is approximately perpendicular to the directions a and b, with the position of the fixed contact 41c as a base point.

The first magnet 55 is disposed on the back surface 51 r of the first magnetic body 51 on the side in the direction b from the alternate long and short dash line B 1 and in the direction a from the alternate long and short dash line B 2 to magnetize the first magnetic body 51. In other words, the first magnet 55 is disposed on the back surface 51r of the first magnetic body 51 between the dashed dotted line B1 and the dashed dotted line B2.
Similarly, the second magnet 56 is disposed on the back surface 52 r of the second magnetic body 52 on the side in the direction b from the alternate long and short dash line B 1 and in the direction a from the alternate long and short dash line B 2 to magnetize the second magnetic body 52. In other words, the second magnet 56 is disposed on the back surface 52r of the second magnetic body 52 between the dashed dotted line B1 and the dashed dotted line B2.

The mechanism of arc extinguishing occurring between the fixed contact 41c and the movable contact 31c and the arc extinguishing mechanism occurring between the fixed contact 41b and the movable contact 31b will be described.
First, the mechanism of extinction of the arc discharge generated between the fixed contact 41c and the movable contact 31c will be described.
The space Ss in the direction b from the periphery of the dashed dotted line B2 forms a magnetic field similar to the space Ss in the direction b from the periphery of the dashed dotted line B of the arc extinguishing portion 5 of the first embodiment. Therefore, when an arc discharge occurs between the fixed contact 41c and the movable contact 31c, the arc discharge is extended in the direction b and extinguished.

Next, the mechanism of extinguishing of the arc discharge generated between the fixed contact 41 b and the movable contact 31 b will be described.
In the space Ss in the direction a from the periphery of the alternate long and short dash line B1, the magnetic field in the space Ss in the direction b from the periphery of the alternate long and short dash line B of the arc extinguishing portion 5 of the first embodiment is axisymmetrical about the alternate long and short dash line B. Form. Therefore, when an arc discharge occurs between the fixed contact 41b and the movable contact 31b, the arc discharge is extended in the direction a and extinguished.

The case where the opening and closing device 102 operates from the closed state to the open state will be described.
It is assumed that the switching device 102 is closed, a voltage is applied between the fixed contact 4b and the fixed contact 41c, and current flows from the fixed contact 4b in the direction of the fixed contact 41c.
Further, in this state, the switching device 102 operates from the closed state to the open state, and arc discharge occurs between the fixed contact 41c and the movable contact 31c and between the fixed contact 41b and the movable contact 31b, respectively. .
The arc discharge generated between the fixed contact 41c and the movable contact 31c is extended in the direction b and extinguished. Similarly, the arc discharge generated between the fixed contact 41 b and the movable contact 31 b is extended in the direction a and extinguished.
That is, since these arcs are drawn in the opposite direction, they are extinguished without crossing.

  As in the first embodiment, since the arc discharge is extended in the direction away from the first magnet 55 and the second magnet 56 to extinguish the arc, the heat accompanying the arc discharge causes the first magnet 55 and the second magnet 56 to It is possible to suppress the demagnetization of the That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Embodiment 7
In the seventh embodiment, an embodiment will be described in which an arc extinguishing plate 59c, a commutation plate 84, and an arc runner (83b, 83c) are provided in order to extinguish the arc rapidly and efficiently. Furthermore, in the seventh embodiment, an embodiment is described in which an arc extinguishing plate 59d having a shape different from that of the arc extinguishing plate 59c is provided.

FIG. 19 is a cross-sectional view of the arc extinguishing portion 5j and the periphery provided in the switchgear of the seventh embodiment.
Further, the same symbols and symbols as in FIGS. 1 to 11 in the drawings are the same as or equivalent to those in the first embodiment, and thus detailed description will be omitted.
The direction f indicated by the arrow indicates a direction substantially perpendicular to the direction a, the direction b, the direction c, and the direction d, and the direction fr indicated by the arrow indicates a direction opposite to the direction f.

The configuration of the arc extinguishing unit 5j and the periphery thereof will be described with reference to FIG.
A fixed contact 41 disposed at one end of the fixed contact 4 d and a movable contact 31 disposed at one end of the movable contact 3 c constitute a pair of contacts. The second side wall 58c is formed of a rectangular portion 58cg and a wide portion 58cw which is wider in the directions f and fr than the rectangular portion 58cg. In addition, a first side wall 57c having substantially the same shape as the second side wall 58c is disposed at a position facing the second side wall 58c (not shown) with the fixed contact 41 and the movable contact 31 interposed therebetween.

Further, the arc runner 83b made of a conductive member is disposed such that the flat plate portion 83bf of the arc runner 83b is substantially parallel to the direction f and generally perpendicular to the direction b. The arc runner 83b is electrically connected to the fixed contact 4d.
Similarly, the arc runner 83c made of a conductive member is disposed such that the flat plate portion 83cf of the arc runner 83c is substantially parallel to the direction fr and generally perpendicular to the direction b. The arc runner 83c is electrically connected to the movable contact 3c.

Further, there is a gap 83g between the arc runner 83b and the arc runner 83c, and the gap 83g is disposed between the first side wall 57c and the second side wall 58c. As described later, the arc discharge generated between the fixed contact 41 and the movable contact 31 is extended in the direction b through the gap 83g.
Further, a commutating plate 84 made of a conductive material is disposed in the extending direction (direction b) of the arc discharge. Further, a space Se surrounded by a dotted line between the commutation plate 84 and the arc runners 83b and 83c is a space provided to expand the arc discharge as described later, and the direction of the space Se A plurality of arc extinguishing plates 59b are disposed on the f side and the direction fr side.

Next, the arc extinguishing process of the arc discharge will be described.
An arc discharge occurs between the fixed contact 41 and the movable contact 31 when the contact operates from the closed state to the open state. The arc discharge is extended in the direction b and passes through the gap 83g to reach the space Se. At the same time, the end of the arc discharge of the fixed contact 41 moves to the arc runner 83b, and the end of the arc discharge of the movable contact 31 moves to the arc runner 83c.

  Furthermore, the arc discharge is extended, extends in both the direction f and the direction fr, and extends while in contact with the arc-extinguishing plate 59b. Furthermore, when the arc discharge reaches the commutation plate 84, the commutation plate 84 and the arc discharge are short-circuited, and the arc action is rapidly divided by the arc extinction plate 59b due to the magnetic action generated from the electric path inside the commutation plate 84. It is cooled and leads to extinction.

  As described above, according to the seventh embodiment, the arc discharge can be extinguished rapidly. Furthermore, as in the first embodiment, it is possible to suppress the demagnetization of the first magnet and the second magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Next, an arc extinguishing portion 5k provided in another switchgear different from the seventh embodiment described above will be described.
FIG. 20 is a cross-sectional view of the arc extinguishing portion 5k. It is to be noted that the same reference numerals and symbols as those in FIGS. 1 to 11 and 19 in the drawings are the same as or equivalent to those in the first embodiment and the seventh embodiment described above, and thus detailed description will be omitted.

The arc extinguishing portion 5k and the periphery will be described with reference to FIG.
The second side wall 58d is formed of a rectangular portion 58dg and a narrow end portion 58dn having a shape in which the width in the direction f (and the direction fr) gradually shrinks in the direction b. Further, a first side wall 57d having substantially the same shape as the second side wall 58d is disposed at a position opposite to the second side wall 58c (not shown), sandwiching the fixed contact 41 and the movable contact 31.

The process of extinguishing the arc discharge is the same as that of the above-described arc extinguishing portion 5j. Furthermore, by providing the first side wall 57d and the second side wall 58d with a shape that gradually shrinks as the arc discharge extends (direction b), the magnetic flux density can be maintained high even at the arc discharge destination. As a result, the rate at which the arc discharge is drawn is increased, and the arc can be quickly transferred to the commutation plate.
That is, the time until the arc discharge is divided and cooled by the arc-extinguishing plate is shortened, and the effect of improving the reliability of interruption can be obtained.

  As described above, according to the seventh embodiment, the arc discharge can be extinguished rapidly. Furthermore, as in the first embodiment, it is possible to suppress the demagnetization of the first magnet and the second magnet due to the heat accompanying the arc discharge. That is, the number of opening and closing operations of the opening and closing device can be improved, and an opening and closing device having high reliability can be provided.

Furthermore, in the first to seventh embodiments, it has been described that the first insulator and the second insulator are formed of a ceramic or the like having heat resistance and insulating properties, but the first insulator and the second insulator are described. The body may be molded of a polymer resin containing hydrogen.
When the arc discharge comes in contact with the first insulator or the second insulator, a part of the surface of the first insulator or the second insulator is vaporized to supply hydrogen gas having high thermal conductivity. The heat of the arc discharge is diffused to this hydrogen gas. That is, the arc discharge can be cooled and extinguished. Furthermore, since the cooling of each portion of the arc extinguishing portion, the contacts and the like is promoted, the effect of improving the insulation recovery of the space is also obtained.
Even when the case 611 and the case 641 described in Embodiment 2 are formed of a polymer resin containing hydrogen, the first insulator and the first insulator have the same effects as in the case of the polymer resin containing hydrogen. can get.

  Further, the first side wall and the second side wall may be configured to gradually expand the width Ws of the space Ss in the extending direction of the arc discharge. According to this configuration, the hydrogen gas generated from the first insulator or the second insulator is injected in the direction orthogonal to the first side wall and the second side wall. Convection occurs, and an effect of extinguishing the arc discharge is obtained.

Furthermore, in the first to seventh embodiments, it is desirable that the thickness tm of the first magnetic body and the second magnetic body be 6 millimeters or less. In the case of tm thicker than 6 mm, when a magnet having a finite residual magnetic flux density is used, the magnetic flux density formed in the magnetic body is reduced to 1 Tesla or less, and leakage from the magnetic material surface near the arc discharge occurrence position In some cases, sufficient Lorentz force can not act on the arc discharge with the magnetic flux density. Therefore, by setting the plate thickness of the magnetic body to 6 mm or less, it is possible to suppress the decrease in the magnetic flux density leaking from the surface of the magnetic body and to improve the blocking reliability. Also, the first magnetic body and the second magnetic body The thickness tm of the body may be gradually reduced in the extending direction of the arc discharge from the generation position of the arc discharge. According to this configuration, the magnetic flux inside the first magnetic body and the second magnetic body can be concentrated even at the extension destination of the arc discharge, so the magnetic flux density leaking from the first magnetic body and the second magnetic body is high. It is possible to maintain and to improve the blocking reliability.

Furthermore, in Embodiments 2 to 7, the magnetization direction of the first magnet is described only in the direction of arrow M1, and the magnetization direction of the second magnet is described only in the direction of arrow M2, but the magnetization direction of the first magnet The direction of the arrow M1r and the direction of magnetization of the second magnet may be the direction of the arrow M2r.
In this case, it is necessary to set the magnetization directions of the induction magnet 61 and the induction magnet 62 according to the second embodiment to the reverse direction of the arrow Ma.

  In the first to seventh embodiments, in the case where the first magnet, the second magnet, and the third magnet are permanent magnets, the effects of the present invention can be obtained by using the first magnet, the second magnet, and the second magnet due to heat accompanying arc discharge. It has been described that it is possible to suppress demagnetization with the three magnets. Even when the first magnet, the second magnet and the third magnet are electromagnets, the first magnet, the second magnet and the third magnet can suppress damage to the electromagnet due to heat accompanying arc discharge.

Furthermore, in the present invention, within the scope of the invention, each embodiment can be freely combined, or each embodiment can be appropriately changed or omitted.

The first magnetic body described in the first to seventh embodiments is an example of the first magnetic body described in the claims. Similarly, the first insulator is an example of the first insulator described in the claims, the first sidewall is an example of the first sidewall described in the claims, and the second magnetic body is The second insulator is an example of a second magnetic body described in the claims, the second insulator is an example of the second insulator described in the claims, and the second side wall is described in the claims It is an illustration of the second side wall, and the third magnetic body is an example of the third magnetic body described in the claims.
Furthermore, the first magnet, the second magnet, and the third magnet are examples of the magnetic field forming magnet described in the claims. Further, the first magnet is an example of the first magnet described in the claims, the second magnet is an example of the second magnet described in the claims, and the third magnet is a claim. It is an illustration of the 3rd magnet described in a range, bent part 51bc is an example of the 1st bent part described in a claim, and bent part 52bc is a 2nd bent part described in a claim. It is an illustration.
The movable contact and the fixed contact are examples of a pair of contacts described in the claims, and the movable contact and the fixed contact are examples of the opening / closing mechanism described in the claims.

  3, 3b, 3c movable contacts 4, 4b, 4c fixed contacts 31, 31b, 31c movable contacts 41, 41b, 41c, 41d fixed contacts 51, 51b first magnetic body, 51bc curved portion 52, 52b second magnetic body, 52bc curved portion, 53 first insulator, 54 second insulator, 55, 55r first magnet, 56, 56r second magnet, 57, 57b, 57c, 57d first side wall, 58, 58b , 58c, 58d second side wall, 59, 59b arc-extinguishing plate, 61, 62 inductive magnet, 63 inductive magnetic body, 64 inductive bar, 71 third magnetic body, 100, 101, 102 switchgear.

Claims (19)

An open / close mechanism having a pair of open / close contacts;
A pair of plate-shaped first magnetic bodies and a plate-shaped first insulator whose surface opposite to the surface is disposed facing the side of one main surface of the first magnetic bodies, the pair of A first side wall disposed facing the surface of the first insulator on the side of the contact in the opening and closing direction;
A pair of plate-like second magnetic bodies and a plate-like second insulator whose surface opposite to the surface is disposed on the side of one main surface of the second magnetic bodies, A second side wall disposed so that the surface of the first insulator and the surface of the second insulator face each other with a contact interposed therebetween;
The first side wall and the second side wall are arranged on one side from the positions of the pair of contacts in the direction along the first side wall and the second side wall, and magnetize the first magnetic body and the second magnetic body. And a magnet for forming a magnetic field in a space sandwiched between the first side wall and the second side wall. Magnetic lines of force are formed in the direction opposite to the one direction at the position of the pair of contacts by the magnetic force of the magnetic field forming magnet, and on the surface of the first insulator, the first magnetic body A line of magnetic force is formed in the direction of the first insulator, and a line of magnetic force is formed in the direction of the second insulator from the second magnetic body on the surface of the second insulator.
Or
Magnetic lines of force are formed in the one direction at the position of the pair of contacts by the magnetic force of the magnetic field forming magnet, and on the surface of the first insulator, the first magnetic material is separated from the first magnetic material. The magnetic field lines are formed in the direction of the body, and the magnetic field lines are formed in the direction of the second magnetic body from the second insulator on the surface of the second insulator. Switchgear as described. The magnetic field forming magnet is
A first magnet connected to the other main surface of the first magnetic body;
The switchgear according to claim 1 or 2, characterized in that it is a second magnet connected to the other main surface of the second magnetic body. A third magnetic body connected to the one side of the first magnetic body and the one side of the second magnetic body with one main surface facing in the opposite direction to the one direction;
The third magnet according to any one of claims 1 to 3, further comprising: a third magnet, which is the magnet for forming a magnetic field, connected to the other main surface of the third magnetic body. Switchgear. Having two sets of the pair of contacts,
One of the two sets of contacts and the other of the two sets of contacts are connected;
When the one pair of contacts operate from the open state to the closed state, the other pair of contacts operate from the open state to the closed state,
The switchgear according to any one of claims 1 to 3, wherein when the one pair of contacts operate from the closed state to the open state, the other pair of contacts operate from the closed state to the open state. . The switchgear according to any one of claims 1 to 5, further comprising a plurality of plate-shaped arc-extinguishing plates in a direction opposite to the one direction. The switchgear according to any one of claims 1 to 5, further comprising a induction magnet in a direction opposite to the one direction. 6. The attraction bar according to claim 1, further comprising a draw-out magnet and a bar-like magnetic material on the main surface of the draw-up magnet in the one direction opposite to the one direction. The switchgear according to any one of the preceding claims. The first magnetic body has a first curved portion bent toward the other main surface of the first magnetic body on the side opposite to the one direction, and the first magnetic body A position of an end of the first curved portion closer to the magnetic field forming magnet than a position of the first curved portion,
The second magnetic body has a second curved portion bent to the side of the other main surface of the second magnetic body on the side opposite to the one direction, and the second magnetic body The position of the tip part of said 2nd curved part is closer to said magnet for magnetic field formation than the position of said 2nd curved part, It is characterized by the above-mentioned. The switchgear described in. The first magnetic body is directed to the side opposite to the one direction, and the thickness of the first magnetic body is reduced.
10. The second magnetic body according to any one of claims 1 to 9, wherein a thickness of the second magnetic body is reduced toward a side opposite to the one direction. Switchgear as described. The first side wall has, on the side opposite to the one direction, a first wide portion which is wider than the one direction,
The second side wall according to any one of claims 1 to 10, further comprising: a second wide portion which is wider than the one direction on a side opposite to the one direction. The switchgear described in the paragraph. The first side wall has, on the side opposite to the one direction, a first narrow portion with a shape in which the width of the first side wall decreases.
The second narrow width portion has a shape in which the width of the second side wall is reduced on the side opposite to the one direction. The switchgear according to any one of 10. The distance between the first side wall and the second side wall is directed to the side opposite to the one direction, and is expanded. Switchgear. The switch according to any one of claims 1 to 13, wherein the first magnetic body and the second magnetic body are made of any of iron, cobalt, and nickel. apparatus. The switchgear according to any one of claims 1 to 14, wherein a thickness of the first magnetic body and a thickness of the second magnetic body are 6 mm or less. The switchgear according to any one of claims 1 to 15, wherein the first insulator and the second insulator are made of ceramic. The switchgear according to any one of claims 1 to 15, wherein the first insulator and the second insulator are made of a polymer resin containing hydrogen. The switchgear according to any one of claims 1 to 17, wherein the magnetic field forming magnet is a permanent magnet. The switchgear according to any one of claims 1 to 17, wherein the magnetic field forming magnet is configured of an electromagnet.

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