JPWO2014155874A1 - Switchgear - Google Patents

Abstract

Opening / closing mechanism (103) that opens and closes the fixed contact (1a) and movable contact (2a), and a magnet that generates a magnetic field to extend the arc generated when both contacts (1a) (2a) are opened (4) and an elongate magnetic body (3) having one end portion in contact with the magnetic pole surface of the magnet, the other end portion of the magnetic body (3) being a stationary contact (1 ) And the movable contact (2) so as to be close to the arc generation region, and the arc is extended along the longitudinal side surface of the magnetic body (3) by the magnetic field generated by the magnet (4).

Description

  The present invention relates to a switching device such as a switch, a switch, a circuit breaker, an electromagnetic contactor, a relay, and the like for cutting off current.

  In the switchgear, the arc generated between the contacts is stretched to increase the arc resistance, and the arc voltage is increased to cut off the current. In particular, in the DC switchgear, it is necessary to make the arc voltage higher than the power supply voltage and generate a current zero point to cut off, so the technique of extending the arc is important. Conventionally, in general, in order to extend an arc, the arc length is extended by linking a magnetic field line of a permanent magnet to the arc and applying a Lorentz force to the arc (for example, Patent Document 1).

JP 2009-87918 A

In a switchgear in which a magnet is mounted in an arc extinguishing chamber in order to extinguish an arc, when the energization direction is reversed, the arc driving direction is reversed, and there is a problem that the reliability of interruption is lowered. In addition, there is a means for expanding the arc extinguishing space so that the arc can be cut off even when the arc is driven in the reverse direction, but this means has a problem that the apparatus becomes large. In addition, not only the magnetic drive action is hard to work on the arc that is driven and extended outside the surface facing the magnetic pole surface of the magnet, but also the magnetic force lines generated from the magnet cause an unexpected electromagnetic force, The reliability of interruption is reduced.
In such a switchgear, it is necessary to apply magnetic lines of force in a uniform direction to the working surface of the Lorentz force in order to apply a desired Lorentz force to the arc. In order to link magnetic field lines in a uniform direction with respect to the arc, the magnetic pole surface of the permanent magnet must be larger than the working surface of the Lorentz force, resulting in a high-cost configuration and securing an arrangement space. It becomes difficult.
In addition, for arcs located at locations that do not oppose the magnetic pole surface of the permanent magnet, the magnetic lines of force generated from the permanent magnet cause an unexpected Lorentz force, which reduces the reliability of interruption, and in the worst case It will cause an accident that cannot be shut off. In a conventional switchgear equipped with a permanent magnet, the arc is almost always extended to the outside of the facing surface of the permanent magnet, and such a switchgear has a poor shutoff reliability.
In addition, a magnetic yoke may be used to form the magnetic lines of force from the permanent magnet outside the opposing surface of the permanent magnet, but the Lorentz force generated by the magnetic lines of force from the permanent magnet reverses when the direction of the current changes. In this case, the reverse connection makes it difficult to cut off and causes an accident. In order to avoid this accident, it is necessary to install an arc extension space and a magnetic yoke that can sufficiently extend even if the direction of the current is reversed and the arc moves in the opposite direction, and the size of the switchgear is increased. there were.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a switchgear that can ensure sufficient shutoff reliability even when a small magnet is used regardless of the direction of current. Yes.

  The switchgear according to the present invention includes a fixed contact having a fixed contact, a movable contact having a movable contact, an opening / closing mechanism for performing an opening / closing operation of the fixed contact and the movable contact, and opening the two contacts. A switching device having a magnet for controlling and extending an arc generated between the two contacts, and having one end disposed in the vicinity of the arc generation region and the other end of one of the magnets. A suction bar surface-bonded to the magnetic pole surface is arranged.

  According to the switchgear of the present invention, the arc generated between the contacts can be driven in the direction of the magnet along the side surface of the attracting rod regardless of the direction of the current. At this time, the arc travels and expands in the direction of the magnet while being driven along the side surface of the suction rod, so that the arc is rapidly cooled. As a result, it is possible to configure an inexpensive and small switchgear while maintaining high shutoff reliability even when a reverse polarity current flows.

It is a sectional side view which shows roughly the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 1 of this invention. It is explanatory drawing for demonstrating the arc-extinguishing operation | movement of the switchgear in Embodiment 1 of this invention. It is a sectional side view which shows the various covers in the suction rod part of the opening / closing apparatus in Embodiment 2 of this invention. It is a sectional side view which shows the modification of the various covers in the suction rod part of the opening / closing apparatus in Embodiment 2 of this invention. It is a side view which shows the other modification of the attraction | suction stick | rod part of the opening / closing apparatus in Embodiment 3 of this invention. It is a side view which shows the other modification of the switchgear suction rod part in Embodiment 4 of this invention. It is a side view which shows the other modification of the attraction | suction stick | rod part of the opening / closing apparatus in Embodiment 5 of this invention. It is a side view which shows the other modification of the attraction | suction stick | rod part of the opening / closing apparatus in Embodiment 6 of this invention. FIG. 10 is a side sectional view showing an application example of the fourth embodiment in another modification of the suction bar portion of the opening / closing device in the seventh embodiment of the present invention. It is a side view which shows the modification of the magnetic reinforcement board of the switchgear in Embodiment 8 of this invention. It is a side view which shows the other modification of the magnetic reinforcement board of the switchgear in Embodiment 9 of this invention. It is a side view which shows the example of arrangement | positioning of the magnetic yoke and magnetic yoke cover of the switchgear in Embodiment 10 of this invention. It is a side view which shows the other example of arrangement | positioning of the magnetic yoke and a magnetic yoke cover of the switchgear in Embodiment 11 of this invention, and shows the example of arrangement | positioning which integrated the magnetic yoke with the magnetic reinforcement board. It is a side view which shows the example of arrangement | positioning of a magnetic induction board and a magnetic induction board cover of the switchgear in Embodiment 12 of this invention. It is a side view which shows the other example of arrangement | positioning of the magnetic induction board and the magnetic induction board cover of the switchgear in Embodiment 13 of this invention. It is sectional drawing in the II line | wire of FIG. It is a side view which shows the example of arrangement | positioning of a permanent magnet and an electromagnet of the switchgear in Embodiment 14 of this invention. It is a side view which shows the other example of arrangement | positioning of the permanent magnet and the electromagnet of the switchgear in Embodiment 15 of this invention. It is a sectional side view which shows roughly the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 16 of this invention. It is sectional drawing in the II-II of FIG. It is a side view which shows the principal part structure of the arc-extinguishing chamber part in which the cooling plate which consists of a fusible resin material of the switchgear in Embodiment 17 of this invention was mounted. It is a side view which shows the principal part structure of the arc-extinguishing chamber part in which the cooling plate which consists of metal materials of the switchgear in Embodiment 17 of this invention was mounted. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 18 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 19 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 20 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 21 of this invention. It is a top view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 22 of this invention. It is a top view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 23 of this invention. It is a top view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear as a modification of Embodiment 23 of this invention. It is a top view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear as another modification of Embodiment 23 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 24 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 25 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part of the switchgear in Embodiment 26 of this invention. It is a sectional side view which shows the modification in Embodiment 26 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 27 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 28 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 29 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 30 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 31 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 32 of this invention. It is explanatory drawing which shows the arc behavior in the arc-extinguishing chamber seen from the fixed side terminal part 11 direction of FIG. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 33 of this invention. It is a modification of Embodiment 33 of this invention, and is explanatory drawing which shows the principal part structure of the arc-extinguishing chamber part seen from the stationary-side terminal part 11 direction of FIG. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 34 of this invention. It is a sectional side view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 35 of this invention. It is a perspective view which shows the principal part structure of the arc-extinguishing chamber part in the opening state of the switchgear in Embodiment 36 of this invention, (a) is a perspective view which shows the state immediately after opening of a switchgear, (b) It is a perspective view which shows the confluence | merging state of an arc.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, the same code | symbol shows the same or an equivalent part between each figure.

Embodiment 1 FIG.
FIG. 1 is a side sectional view showing a main part configuration of an opening / closing mechanism part, a relay part, and an arc extinguishing chamber part in an open state of a switching apparatus according to Embodiment 1 of the present invention, and FIG. 2 is an embodiment of the present invention. It is explanatory drawing for demonstrating arc-extinguishing operation | movement of the arc of the switchgear in the form 1.
As shown in FIG. 1, the switching device 100 according to the first embodiment is configured to open and close a fixed contact 1 having a fixed contact 1a, a movable contact 2 having a movable contact 2a, and a fixed contact 1a and a movable contact 2a. An opening / closing mechanism 103 for operating, a magnet 4 for generating a magnetic field for extending an arc generated between the fixed contact 1 and the movable contact 2 when the fixed contact 1a and the movable contact 2a are separated, and one end portion And a long magnetic body 3 in contact with the magnetic pole surface of the magnet 4, wherein the other end of the magnetic body 3 is located in an arc generation region between the fixed contact 1 and the movable contact 2. A magnet 4 that is arranged so as to be close to each other and that controls and expands the arc A generated between the two contacts 1 and 2 when the two contacts 1a and 2a are separated, and one end thereof are arranged in the vicinity of the arc generation region. In addition, the other end is surface-bonded to one magnetic pole surface of the magnet 4 It is intended to the basic configuration and a suction rod 3 made of, whereby the arc by the magnetic field generated by the magnet 4, is extended along the longitudinal side of the magnetic body 3.

Hereinafter, the switchgear according to Embodiment 1 will be described with reference to FIGS. 1 and 2.
In FIG. 1, the switchgear 100 is provided with a fixed-side terminal portion 11 and a movable-side terminal portion 12 connected to an external power circuit at both ends of a casing constituted by a case 101 made of an insulator. Is provided with an arc extinguishing chamber 102 for extinguishing the arc.
The arc extinguishing chamber 102 has a fixed contact 1 formed integrally with the fixed-side terminal portion 11 and provided with a fixed contact 1a at a predetermined portion, and a movable contact 2a that contacts and separates from the fixed contact 1a. A long magnetic body having one end disposed in the vicinity of the arc generation region so as to face the space between the movable contact 2 provided so as to be fixed, the fixed contact 1 and the movable contact 2 The opposite end of the suction bar 3 that is adjacent to the suction bar 3 (surface joining), that is, the other surface of the suction bar 3, that is, the opposite surface of the arc A generated between the fixed contact 1a and the movable contact 2a. A magnet 4 is disposed on the end face of the other end of the suction bar 3 on the side, and a magnetic pole face facing this end face is surface-bonded to drive the arc along the peripheral side surface of the suction bar 3.
The suction rod 3 can obtain the same effect even when a round bar, a rectangular parallelepiped, a cylindrical shape, or a shape such as a polygonal rod is used. It is protected by a magnetic insulating cover 3c provided so as to face an area where an arc A having a current-carrying direction in front of the paper surface, and a magnet reinforcing plate 6 described later is attached to the magnet 4. In addition, the structure of the part which is not shown in figure is the same as the prior art of patent document 1, etc., for example.

  Next, a drawing in which the attracting rod 3 protected by the magnetic insulating cover 3c is arranged, and the end surface of the attracting rod 3 opposite to the arc generation position is surface-bonded to the magnetic pole surface of the permanent magnet 41 having the N pole. The arc extinguishing principle will be explained using the two models by dividing the progress stages leading to extinction into five stages (I) to (V).

In FIG. 2, first, in the arc extinguishing stage (I), the magnetic lines of force M generated from the permanent magnet 41 are induced by the attracting rod 3, and the interlinkage magnetic field to the arc from the tip of the attracting rod 3 toward the arc. Will occur. The Lorentz force acts on the arc by the interlinkage magnetic field, and the arc is driven in the lower direction in FIG.
Next, in the arc extinguishing progress stage (II), the magnetic lines of force M formed so as to wrap around the arc driven in the stage (I) from the tip of the attracting rod 3 to the S pole side of the permanent magnet 41 are chained. Come to fuck. This interlinkage magnetic field attracts the arc to the arc extension space that extends to the side surface in the longitudinal direction of the suction rod.

  Next, in the arc extinguishing stage (III), the arc drawn into the arc extension space is drawn further to the back by a magnetic force line M generated on the normal line from the side surface of the suction bar 3. As the arc is pulled deeper, the strength of the magnetic field generated from the side surface of the suction rod 3 increases, so that it becomes difficult for the arc to be detached from the suction rod 3, and the arc is stably transferred to the rear side (right side) of the suction rod 3. Can be stretched. In addition, the magnetic field lines interlinking with the arc drawn in the back contain many magnetic field lines that wrap around the S pole side of the permanent magnet 41, and the interlinkage magnetic field by the magnetic field lines in this direction (right side in the figure) is A force for attracting the arc to the inside of the suction rod 3 is caused.

  Next, in the arc extinguishing stage (IV), a Lorentz force that pushes the inner side of the suction bar with a stronger force acts on the arc in the vicinity of the magnetic insulating cover 3c that protects the suction bar 3. As a result, the arc is compressed toward the magnetic insulating cover 3c, and the resistance inside the arc is rapidly increased. Then, the ablated gas generated by the arc heat is blown toward the arc from the arc exposed surface of the magnetic insulating cover 3c, whereby the arc is cooled and the resistance inside the arc is further increased.

  Finally, in the arc extinguishing stage (V), when a concave slit 3e as shown in the figure is provided in a part of the magnetic insulating cover 3c, the Lorentz force pushed into the inside of the suction rod 3 The arc is drawn into the slit and the arc contracts thinly. Further, the ablated gas by the magnetic insulating cover 3c is blown from around the contracted arc, and the resistance increases until the electric conductivity cannot be maintained inside the arc, and the arc is extinguished.

According to the above structure, the same effect can be obtained even when the energization direction is reversed. In each arc extinguishing stage, the arc extends so as to be symmetric with respect to the axis of the suction bar 3 as shown in the figure. To go. Further, the same effect can be obtained even when the direction of the magnetic pole surface of the permanent magnet 41 (or the magnet 4) is reversed, and the arc expands so as to be the target at the axis of the suction bar 3 at each arc extinguishing stage. I will do it.
Thus, by using the suction rod 3 and the permanent magnet 41 (or the magnet 4), it becomes possible to drive and extend the arc in the same direction, and the reliability of interruption without increasing the size of the switchgear. Can be increased.

Moreover, in this Embodiment 1, it has the further effect by adding the following members other than said basic structure.
First, the switchgear includes an arc extension space part, and by arranging a permanent magnet (or magnet) in the arc extension space part, it is possible to extend the length that the arc can be extended and to further increase the arc resistance.
Further, the magnetic reinforcing plate 6 made of a magnetic material is provided on the magnetic pole surface on the opposite side (the anti-attraction bar side) that is not adjacent (surface bonded) to the attraction bar 3 of the permanent magnet 41 (or magnet 4), thereby attracting the magnet. Since the magnetic resistance of the magnetic circuit formed by the magnetic field lines that circulate around the permanent magnet 41 (or the magnet 4) via the bar 3 is reduced, the magnetic field intensity generated from the surface of the attraction bar 3 is increased, further improving the arc extinguishing performance Can be increased.

  Further, since the magnet 4 used in the form of FIG. 1 is composed of the permanent magnet 41, a constant magnetic flux can be applied to the arc, so that even in a current region where the magnetic flux generated from the conducting conductor is weak (for example, less than 1 kA). A stable shut-off can be performed.

  In the above description of the arc extinguishing principle, the permanent magnet 41 is used as a magnet to be used. However, as will be described later in Embodiments 14 and 15, either one of the contacts or an external power source is electrically connected. Even if the coiled conductors connected to each other are wound around a part of the periphery of the suction bar 3 and a part of the suction bar 3 is configured as the electromagnet 5, the arc can be extinguished by the same phenomenon as described above. it can. When the permanent magnet 41 is used as the magnet, the current range in which the effect can be exhibited most is different between the case where the electromagnet 5 is used. When the permanent magnet 41 is used, a relatively weak current region (for example, less than 1 kA). When the electromagnet 5 is used, the effect is exhibited in a relatively large current region (for example, 1 kA or more) in which the magnetic flux generated from the current flowing through the conductor is large.

  As described above, according to the first embodiment of the present invention, by adopting the basic configuration described above, the generated arc A is drawn into the back of the suction bar 3 regardless of the energization direction, and the arc is extended. It can then be cooled and extinguished.

Embodiment 2. FIG.
In the first embodiment, as shown in FIGS. 1 and 2, the suction rod 3, the magnet 4, and the magnetic reinforcing plate 6 are integrally formed so as to be protected from arcs, but in the second embodiment, 3 and 4, for each component, an insulating cover for protecting each member, that is, a magnetic insulating cover 3c, a magnet cover 4c, a magnetic reinforcing plate cover 6c, and a magnetic yoke cover 7c described later. , And a magnetic guide plate cover 8c described later.
Next, a second embodiment, which is a modification of the first embodiment, is provided with a magnetic insulating cover 3c for protecting the suction rod 3, a magnet cover 4c for protecting the magnet, and a magnetic reinforcing plate cover 6c. 3 and will be described with reference to FIG.

  As shown in FIGS. 3 and 4, a magnetic insulating cover 3 c and a magnet cover 4 c which are insulating protective covers are provided around the suction rod 3 and the permanent magnet 41. Thereby, the effect of compressing and cooling the arc can be obtained, and the reliability of interruption can be further improved.

Further, by providing the magnetic reinforcing plate 6 with the magnetic reinforcing plate cover 6c, the magnetic reinforcing plate 6 is melted by the arc heat of the arc drawn to the vicinity of the magnet, or is applied to the permanent magnet 41 via the magnetic reinforcing plate 6. Heat transfer can be prevented.
Further, the arc can be compressed and cooled by the magnetic reinforcing plate cover 6c, and the reliability of interruption can be improved.

In addition, at least one member of the magnetic insulating cover 3c, the magnet cover 4c, the magnetic reinforcing plate cover 6c, and the magnetic induction plate cover 8c described later is made of a fusible resin material, thereby forming a magnetic material. The cooling effect by the ablation gas sprayed from the body insulating cover 3c to the arc A can be further enhanced, and the shut-off reliability is improved.
Also, as shown in FIG. 3, by providing the magnetic insulating cover 3c on the arc exposed surface of the suction bar 3, cooling is promoted by the ablated gas from the side surface of the stretched arc.

  Further, as shown in FIG. 3, by providing a concave portion or a convex portion (uneven portion 3d) on a part of the magnetic insulating cover 3c, the magnetic insulating member against an arc pressed against the magnetic insulating cover 3c. Since the contact area with the cover 3c is enlarged, the cooling efficiency of the arc by the ablated gas is improved, and the interruption reliability can be further increased.

In the arc extinguishing stage (IV), the stretched arc is pressed against the magnetic insulating cover 3c, and the wear of the magnetic insulating cover 3c at that point increases.
Therefore, as shown in FIG. 4, in the vicinity of the contact surface between the suction bar 3 and the permanent magnet 41, the thickness of the insulating cover for magnetic material is increased to increase the durability of the cover, thereby further improving the shutoff reliability.
According to FIG. 4, the effect of cooling the arc by the ablated gas from the magnetic insulating cover 3c or the magnet cover 4c can be effectively and continuously applied.

  Further, by providing the magnet cover 4c, it is possible to compress and cool the arc A drawn to the side surface portion of the permanent magnet 41 and to prevent the permanent magnet 41 from being thermally demagnetized by the arc heat.

  Further, even when a material having a high melting point is used for improving the durability of the magnet cover 4c for the arc reaching the arc extinguishing stage (V), a recess is formed in a part of the magnet cover 4c as shown in FIG. Alternatively, by providing the convex portion (uneven portion 4d), the arc is drawn into the groove of the uneven portion 4d of the magnet cover 4c, and the contact area between the arc and the magnet cover 4c is increased, thereby improving the cooling effect of the arc. Can do. Therefore, it is possible to promote the cooling of the arc while improving the durability of the magnet cover 4c.

  In addition, since the magnet 4 used in FIG. 1 is composed of the permanent magnet 41 in FIG. 4, a constant magnetic flux can be applied to the arc, so that the current generated by the conducting conductor is weak (for example, less than 1 kA). But stable shut-off can be performed.

  In addition, the magnet cover 4c that needs to prevent thermal demagnetization of the permanent magnet 41 due to arc heat is made of a material having a high melting point, a magnetic insulating cover 3c, a magnetic reinforcing plate cover 6c, and a magnetic induction described later. If at least one member of the plate cover 8c is made of a material having a melting point lower than that of the magnet cover 4c, the arc A can be effectively cooled while protecting the permanent magnet 41.

  Moreover, the number of parts is reduced by integrally forming at least any two members of the magnetic insulating cover 3c, the magnet cover 4c, the magnetic reinforcing plate cover 6c, and the magnetic induction plate cover 8c described later as one set. Manufacturing costs can also be reduced.

As described above, according to the second embodiment, an effect can be obtained for each type of insulating cover without arranging all the types of insulating covers, and the effect can be superimposed by using various types of insulating covers in combination.
Moreover, when using various insulating covers, a material can be changed for every various insulating covers.

Embodiment 3 FIG.
Next, a third embodiment, which is a modified example of the suction bar 3 for increasing the magnetic field strength of the magnetic lines M formed from the suction bar 3 toward the arc, will be described with reference to FIG. In FIG. 5, only the structure of the suction bar 3 and the permanent magnet 41 is described.
First, in the suction rod 3 of Embodiment 3 shown in FIG. 5, the area of the adjacent surface (joint surface) between the suction rod 3 and the permanent magnet 41 is larger than the average cross-sectional area of the suction rod 3.
According to the third embodiment, many of the magnetic force lines M generated from the magnetic pole surface of the permanent magnet 41 can be guided into the suction rod, the magnetic flux density linked to the arc through the suction rod 3 is increased, and the arc is quickly attracted. It becomes possible to retract to the back of the rod 3.

Embodiment 4 FIG.
Next, Embodiment 4 which is a modified example of the suction bar 3 for increasing the magnetic field strength of the magnetic force lines M formed from the suction bar 3 toward the arc will be described with reference to FIG. In FIG. 6, only the structure of the suction bar 3 and the permanent magnet 41 is described.
In the suction bar 3 according to the fourth embodiment shown in FIG. 6, the area of the end surface on the arc generation space side of the suction bar 3 is smaller than the average cross-sectional area of the suction bar 3.
That is, the lines of magnetic force M distributed in the suction bar are concentrated at the tip of the suction bar 3, the magnetic flux density generated from the tip of the suction bar 3 is increased, and an arc (not shown) located at the tip of the suction bar 3 is increased. High speed suction to the suction bar side is possible.

Embodiment 5 FIG.
Next, Embodiment 5 which is a modified example of the suction rod 3 for increasing the magnetic field strength of the magnetic lines of force M formed from the suction rod 3 toward the arc A will be described with reference to FIG. In FIG. 7, only the main structures of the suction bar 3 and the permanent magnet 41 are shown.
In the suction bar 3 of the fifth embodiment shown in FIG. 7, the normal direction of the surface of the suction bar 3 on the arc generation space side is tilted toward the arc A generation position.
That is, the magnetic flux density for attracting the arc A to the suction bar side is increased by bringing the direction of the magnetic force lines generated from the tip of the suction bar 3 close to the direction in which the arc A is generated, and on the central axis extension line of the suction bar 3. An arc that has not occurred can be easily attracted.

Embodiment 6 FIG.
Next, Embodiment 6 which is a modified example of the suction bar 3 for increasing the magnetic field strength of the magnetic lines of force M formed from the suction bar 3 toward the arc A will be described with reference to FIG. In FIG. 8, only the structure of the suction bar 3 and the permanent magnet 41 is described.
The suction rod 3 according to the sixth embodiment shown in FIG. 8 is an example in which the embodiments 3 to 5 are combined. Each embodiment is not limited to a single use, but by combining them, the effect of attracting the arc A to the suction rod 3 can be exhibited in a superimposed manner. In FIG. 8, a high interlinkage magnetic field can be applied to the arc A (not shown) that is not located on the central axis extension line of the suction rod 3, and the arc can be easily attracted to the suction rod.

Embodiment 7 FIG.
Next, a seventh embodiment which is a modification of the suction rod 3 will be described with reference to FIG.
The suction rod 3 of the seventh embodiment shown in FIG. 9 is a modification of the fourth embodiment, and is obtained by adding a magnetic insulating cover 3c to the suction rod 3 and the permanent magnet 41 of the fourth embodiment. is there.
According to the seventh embodiment, the magnetic force lines generated from the magnetic pole surface of the permanent magnet 41 are concentrated on the tip of the attracting rod 3, and the magnetic force line structure that circulates from the tip of the attracting rod 3 to the other magnetic pole surface of the permanent magnet 41. It is formed. That is, an arc (not shown) approaching the vicinity of the tip of the suction rod acts to attract the arc against the magnetic insulating cover 3c by the magnetic field lines M that circulate, and further the magnetic insulating cover 3c against the compressed arc. The spraying of the ablated gas occurs. Therefore, even when the space for extending the arc cannot be secured, the arc extinguishing action can be exhibited in a space-saving manner according to the seventh embodiment.

Embodiment 8 FIG.
Next, an eighth embodiment, which is a modification of the magnetic reinforcing plate in the first embodiment, for increasing the magnetic field strength of the magnetic force lines formed from the suction rod 3 toward the arc A will be described with reference to FIG.
The magnetic reinforcing plate 6 of the eighth embodiment shown in FIG. 10 has a shape in which the magnetic reinforcing plate 6 is enlarged in a direction approaching the arc generation position.
According to the eighth embodiment, the distribution of magnetic force lines formed symmetrically with respect to the central axis of the suction bar 3 is biased, and the magnetic force lines are concentrated in the space on the side where the arc A is generated. Therefore, the strength of the magnetic field applied to the arc A can be increased, and the effect of attracting the arc A to the suction rod 3 can be enhanced.

Embodiment 9 FIG.
Next, a ninth embodiment, which is a modification of the eighth embodiment, will be described with reference to FIG.
The magnetic reinforcing plate 6 of the ninth embodiment shown in FIG. 11 extends the magnetic reinforcing plate 6 in a direction approaching the arc generation position, and further expands the volume of the magnetic reinforcing plate 6.
According to the ninth embodiment, not only the magnetic lines of force concentrate in the space on the arc A generation position side, but also the magnetic resistance of the magnetic circuit formed in the space on the arc A generation position side decreases, The magnetic field strength to the arc can be increased.

Embodiment 10 FIG.
Next, a tenth embodiment which is a modification of the first embodiment in which the force for extending the arc A to the back side of the suction rod 3 is further strengthened with respect to the arc A located on the side surface of the suction rod, and the cooling effect is enhanced. Will be described with reference to FIG.
In the tenth embodiment shown in FIG. 12, the magnetic yoke 7 is arranged so that a part of the arc extension space extending on the side surface of the suction bar 3 is sandwiched between the suction bar 3 and the magnetic yoke 7.
That is, the magnetic lines of force M are concentrated from the suction bar 3 toward the magnetic yoke 7, and the Lorentz force for drawing the arc located on the side surface of the suction bar toward the back side of the suction bar 3 is strengthened. Therefore, the arc can be extended at a high speed, and a strong compression effect can be produced by colliding the accelerated arc with the magnetic insulating cover 3c.
Further, in FIG. 10, by providing an insulating magnetic yoke cover 7c on a part of the arc exposed surface of the magnetic yoke 7, the stretched arc is magnetically coupled with the magnetic insulating cover 3c disposed on the side surface of the suction bar. Since it is sandwiched between the yoke covers 7c and the effect of cooling by the ablated gas from both sides of the covers acts in addition to the effect of arc contraction due to space limitations, the arc extinguishing action can be further enhanced. Become.
In addition, since these functions have a cooling effect even when one cover is disposed, both covers are not necessarily required.

Embodiment 11 FIG.
Next, an eleventh embodiment, which is a modification of the tenth embodiment, will be described with reference to FIG. In the eleventh embodiment shown in FIG. 13, the magnetic yoke 7 and the magnetic reinforcing plate 6 are integrally formed, and both are used as the dual-purpose member 67, thereby reducing the magnetic resistance of the magnetic circuit formed around the suction rod. Therefore, the Lorentz force acting on the arc positioned between the suction bar 3 and the magnetic yoke 7 can be further strengthened.
Therefore, by integrating the magnetic yoke 7 and the magnetic reinforcing plate 6, the arc extension speed can be further increased without adding the number of parts of the magnetic yoke 7, and the arc A can be extinguished quickly.

Embodiment 12 FIG.
Next, a twelfth embodiment, which is a modification of the first embodiment, for sucking the arc A generated at a position away from the tip of the suction rod 3 will be described with reference to FIG.
In the twelfth embodiment shown in FIG. 14, the arc generation position between the contacts is sandwiched between the tip of the suction bar 3 and the magnetic induction plate 8 made of a magnetic material, and a part of the arc exposed surface of the magnetic induction plate 8 is magnetized. It is protected by a guide plate cover 8c.
According to the twelfth embodiment, the lines of magnetic force generated from the tip of the attraction bar 3 can be attracted to the magnetic induction plate 8, and in the space located between the end of the attraction bar 3 and the magnetic induction plate 8. Magnetic flux density can be increased. Therefore, the Lorentz force for attracting the suction rod 3 can also be applied to the arc A away from the suction rod 3.

Embodiment 13 FIG.
Next, a thirteenth embodiment which is a modification of the twelfth embodiment will be described with reference to FIGS.
The magnetic induction plate 8 according to the thirteenth embodiment relates to the shape and arrangement example of the magnetic induction plate 8, and the magnetic induction plate 8 according to the thirteenth embodiment shown in FIG. A portion is sandwiched by a magnetic induction plate 8 made of a magnetic material with at least a part of the arc exposed surface protected using a magnetic induction plate cover 8c, and the suction rod 3 is provided in the arc driving direction.
That is, the magnetic induction plate 8 not only guides the magnetic force lines generated from the tip of the attraction bar 3 to the arc generation space sandwiched between the magnetic induction plates 8, but also induces the magnetic force lines generated from the current flowing in both contacts, The suction of the arc A to the suction rod 3 is facilitated. Further, the magnetic induction plate 8 of the thirteenth embodiment is formed in a U-shape as shown in FIG. 16, but the arc generation space is sandwiched between two or more plate-shaped members made of a magnetic material. Even if it arranges, the same effect is acquired.

Embodiment 14 FIG.
Next, a fourteenth embodiment which is a modification of the first embodiment when the electromagnet 5 is used as the magnet 4 will be described with reference to FIG.
FIG. 17 shows only the main structure of the suction bar 3, the permanent magnet 41, the first electromagnet (suction bar side electromagnet) 5A, and the suction bar insulating cover 3c.
First, in FIG. 17, one of the fixed contact 1 and the movable contact 2 is provided at a part of the periphery of the suction bar 3 adjacent (surface bonded) to the magnetic pole surface of the permanent magnet 41, that is, at the other end of the suction bar 3. Or a coiled conductor connected to either the external power source or the like, and a portion of the suction bar 3 is configured as the first electromagnet 5A.
That is, for the interruption of a relatively small current, the arc A is attracted to the attracting rod 3 by the magnetic action of the permanent magnet 41 to extinguish the arc, and for the interruption of a relatively large current, the magnitude of the interruption current is set in the electromagnet. By flowing a current, the magnetic force of the permanent magnet 41 can be reinforced and a large current arc can be extinguished.

Embodiment 15 FIG.
Next, a fifteenth embodiment, which is a modification of the fourteenth embodiment, will be described with reference to FIG. In FIG. 18, the attraction bar 3 provided with the permanent magnet 41 and the first electromagnet 5 </ b> A at the same time, and the magnetic pole surface on the side where the attraction bar 3 of the permanent magnet 41 is not adjacent (surface bonded) are opposite to the first electromagnet 5 </ b> A. A second electromagnet (anti-attraction bar-side electromagnet) 5B capable of generating magnetic field lines in the direction is disposed.
According to the fifteenth embodiment, it is possible to cancel the magnetic lines of force generated from the first electromagnet 5A toward the permanent magnet 41 with the magnetic lines of force generated from the second electromagnet 5B, and from the first electromagnet 5A of the permanent magnet 41. The influence of demagnetization due to the external magnetic field exerted can be prevented.

Embodiment 16 FIG.
Next, a sixteenth embodiment which is a modification of the first embodiment in which the cooling rod 9 is disposed in the space of the suction rod side surface will be described with reference to FIGS.
First, in the figure showing the main components in the vicinity of the arc extinguishing chamber, a plurality of cooling rods 9 are continuously arranged so as to collide with the arc A extending in a part of the arc extension space extending on the side surface of the suction rod 3. It is arranged.
According to the sixteenth embodiment, the arc A collides with the cooling rod 9 and expands by the suction action of the suction rod 3, and the arc A is cooled each time it collides, and the arc A is extinguished after being cooled.
Further, by forming the material of the cooling rod 9 from a metal material having a high thermal conductivity, the heat of the arc A can be quickly transferred to the cooling rod 9 and the heat energy in the arc can be easily taken away. .
Further, the material of the cooling rod 9 may be formed of a fusible resin material. That is, the arc A that collides with the cooling rod 9 is sprayed with the ablated gas from the cooling rod 9 to accelerate the cooling, and at the same time, the electrical conductivity inside the arc can be lowered due to the physical properties of the ablated gas. In particular, by using a resin material containing hydrogen, the thermal conductivity inside the arc is increased, so that the thermal energy of the arc A can be easily diffused.

Embodiment 17. FIG.
Next, a seventeenth embodiment which is a modification of the sixteenth embodiment will be described with reference to FIGS.
In FIG. 21 and FIG. 22, a plurality of cooling plates 91 are continuously arranged along the axial direction of the suction bar 3 in a part of the arc extension space extending on the side surface of the suction bar 3.
According to the seventeenth embodiment, the same effect as in the sixteenth embodiment is obtained, and the cooling plate 91 is superimposed on the arc A by whether it is formed of a fusible resin material or a metal material. The cooling effect is different.
That is, when the cooling plate 91 is formed of a fusible resin material, the arc A extends along the periphery of the cooling plate 91 as shown in FIG. Thus, the ablated gas can be sprayed into the arc at almost all locations of the arc A, and the arc A can be easily cooled.
When the material of the cooling plate 91 is formed of a metal material, as shown in FIG. 22, the arc A is divided (divided) by the cooling plate 91, and the divided arc A is cooled by heat transfer to the cooling plate 91. In addition, since a voltage drop due to the electrode drop voltage occurs at the interface between the arc A and the cooling plate 91, the action of reducing the current flowing inside the arc works.

Embodiment 18 FIG.
Next, an embodiment of a switching device using a cooling plate, which is different from the embodiment 17, will be described with reference to FIG.
In FIG. 23, a fixed contact 1a is fixed to the fixed contact 1, and a movable contact 2a is fixed to one end to form a contact pair. One end of the stationary contact 1 is electrically connected to a relay unit 104, for example, a bimetal that detects an overload current. On the other hand, the other end of the movable contact 2 is provided with a rotating shaft (not shown) for rotatably holding the movable contact 2 and an opening / closing mechanism 103 for opening and closing the contact pair. In addition, a flexible conductor or a sliding contact is provided at the other end of the movable contact 2 and is electrically connected to the traveling electric circuit 111.

  The fixed contact 1 extends from one end connected to the cooling plate 91 made of a metal magnetic material that divides the arc A and causes a voltage drop inside the arc through a curved portion. On the other hand, the traveling electric circuit 111 is once bent toward the stationary contact 1 side, and again obliquely extends toward the bottom of the casing (downward in FIG. 23), and one end thereof is disposed below the cooling plate 91. ing. That is, the plurality of cooling plates 91 are disposed so as to be surrounded from the vertical direction by the end portions of the stationary contact 1 and the traveling electric path 111 on the cooling plate 91 side. The plurality of cooling plates 91 are held by a cooling side plate so as to be sandwiched from the direction perpendicular to the paper surface with an appropriate gap, and the number of the plurality of cooling plates 91 is necessary to obtain a predetermined current limiting performance. The number of sheets is secured.

These circuit breaker components are housed in a case 101 constituting a housing. A handle for manually operating the opening / closing mechanism 103 is provided so as to protrude from the case 101.
An attracting rod 3 made of a magnetic material is disposed in a space sandwiched by the traveling electric circuit 111, and a magnet 4 having a magnetic pole surface is adjacent to the end surface of the attracting rod 3 opposite to the surface facing the arc A generated between the two contacts (surface contact). Combined). Therefore, the generated arc A is quickly drawn into the back of the suction rod 3 and can be easily cooled by hitting the arc A against the cooling plate 91, leading to extinction.
In addition, the magnet 4 used in the embodiment of FIG. 23 may be constituted by a permanent magnet 41. In the case of being constituted by the permanent magnet 41, a constant magnetic flux can be applied to the arc A, and therefore it is generated from a current-carrying conductor. Stable interruption can be performed even in a region where the magnetic flux to be weak is weak (for example, less than 1 kA).

Further, the area of the end face on the arc generation space side of the suction bar 3 is reduced from the average cross-sectional area of the suction bar 3. As a result, the lines of magnetic force distributed in the suction bar are concentrated at the tip of the suction bar 3, the magnetic flux density generated from the tip of the suction bar 3 is increased, and the arc A (not shown) located at the tip of the suction bar 3 is increased. Can be sucked into the suction bar side at high speed.
Further, the normal direction of the surface of the suction bar 3 on the arc generation space side is inclined toward the arc A generation position. That is, the magnetic flux density for attracting the arc A to the suction bar side is increased by bringing the direction of the magnetic force lines generated from the tip of the suction bar 3 close to the direction in which the arc A is generated, and on the central axis extension line of the suction bar 3. The arc A that has not been generated can be easily attracted.

  Further, by forming the material of the cooling plate 91 from a metal material having a high thermal conductivity, the heat of the arc A is quickly transferred to the cooling plate 91, and the thermal energy in the arc can be easily taken away. Further, when the material of the cooling plate 91 is formed of a metal material, the arc A is divided by the cooling plate 91 as shown in FIG. 23, and the divided arc A is cooled by heat transfer to the cooling plate 91. Since the voltage drop due to the electrode drop voltage occurs at the interface between the arc A and the cooling plate 91, the action of reducing the current flowing inside the arc works.

Embodiment 19. FIG.
Next, a nineteenth embodiment which is a modification of the eighteenth embodiment will be described with reference to FIG. In FIG. 24, a part of the fixed contact 1 on the cooling plate arrangement side is cut, and the position of the suction bar 3 is arranged on the fixed contact side (upper side in the figure).
Further, a cooling plate 91 is continuously arranged along the axial direction of the suction bar 3 in a part of the arc extension space extending downward of the suction bar 3. While the arc A collides with the cooling plate 91, the arc A expands due to the suction action of the suction rod 3, and the arc A is cooled each time it collides, and the arc A is extinguished after being cooled.

  Further, by forming the material of the cooling plate 91 from a metal material having a high thermal conductivity, the heat of the arc A is quickly transferred to the cooling plate 91, and the thermal energy in the arc can be easily taken away. Further, when the material of the cooling plate 91 is formed of a metal material, as shown in FIG. 23, the arc is divided by the cooling plate 91, and the divided arc A is cooled by heat transfer to the cooling plate 91. Since a voltage drop due to the electrode drop voltage occurs at the interface between the arc A and the cooling plate 91, the action of reducing the current flowing inside the arc works.

Embodiment 20. FIG.
Next, a twentieth embodiment which is a modification of the first embodiment for obtaining the effect of the present invention without arranging a suction rod will be described with reference to FIG.
The switchgear of FIG. 25 includes an arc extension space for extending an arc generated between the fixed contact 1 and the movable contact 2, and a bar magnet 42 for generating a magnetic field for extending the arc. The longitudinal side surface of the magnet 42 is protected by an insulative magnet cover 4 c, and one end of the magnetic pole surface of the bar magnet 42 is close to the arc generation location located between the fixed contact 1 and the movable contact 2. Located in the extension space. Therefore, the arc is stretched along the longitudinal side surface of the bar magnet 42 by the magnetic field generated by the bar magnet 42 and wound around the bar magnet 42, and the arc is cooled by the ablated gas generated from the magnet cover 4c and extinguished. I can do it. Furthermore, since a high permeance coefficient can be ensured by providing the bar magnet 42 with a certain length or more, thermal demagnetization of the magnet can be prevented.
Further, by providing an uneven portion (concave portion or convex portion) 4d for drawing and compressing the arc in a part of the insulating magnet cover 4c of the bar magnet 42, the arc is compressed in the narrow gap of the insulating magnet cover 4c. At the same time, the ablated gas generated from the insulating magnet cover 4c can be efficiently blown onto the arc, and the interruption performance can be improved.

Embodiment 21. FIG.
Next, Embodiment 21 which is another modified example of Embodiment 1 for obtaining the effect of the present invention without arranging a suction rod will be described with reference to FIG.
In the twenty-first embodiment shown in FIG. 26, an arc extension space for extending an arc generated between the pair of contacts 1 and 2 and a permanent magnet 41 for generating a magnetic field for extending the arc are provided. The permanent magnet 41 is disposed at an arc extension destination in the arc extension space, and an insulating uneven magnet cover 416c is provided on a side surface other than the magnetic pole surface of the permanent magnet 41.
Therefore, the arc is drawn into the recess 416d of the magnet cover 416c by the magnetic field generated by the permanent magnet 41 and compressed, and the arc cooling action from the magnet cover 416c can be made highly efficient.
Further, by using a magnet having a strong magnetic force such as a neodymium magnet as the permanent magnet 41, the arc can be drawn into the concave portion 416d of the protective cover 416c even when the arc is far away.

Embodiment 22. FIG.
An arc extinguishing chamber of the switchgear according to Embodiment 22 will be described with reference to FIG.
FIG. 27 is a plan view showing only main components of the arc extinguishing chamber.
The arc extinguishing chamber of the twenty-second embodiment is an application example in a switchgear that is divided into a plurality of parts and has two or more poles.
In FIG. 27, a pair of a stationary contact 1 and a movable contact (not shown) electrically connected to an external conductor is provided inside a case 101 that can accommodate components of a two-phase arc extinguishing chamber. The other end portions of the two suction rods 31 and 32, which are provided in each phase and simultaneously control two arcs A generated between these two pairs of contacts, have a plurality of contacts. One end of each of the suction rods 31 and 32 is placed in the partition wall of the case 101 that separates the two-phase arc extinguishing chamber. A magnetic insulating cover 3c is provided around each of the suction rods 31 and 32 so as to be in contact with the magnetic pole surface.
Therefore, two permanent magnets 41 can simultaneously draw two arcs with the suction rods 31 and 32, and a high breaking reliability can be secured with a small number of parts.

Embodiment 23. FIG.
Next, the arc extinguishing chamber of the switchgear according to Embodiment 23 will be described with reference to FIG. 28A.
The suction rods 31 and 32 shown in FIG. 27 do not necessarily have to be adjacent (surface joined) to both magnetic pole faces of the permanent magnet 41, and as shown in FIG. 28A, the suction poles are branched into two on one magnetic pole face. The rod 3 may be adjacent (surface bonded) to one magnetic pole surface of the permanent magnet 41, and each end of the branched attracting rod 3 may be extended to the arc generation position.
In FIGS. 27 and 28A, the permanent magnet 41 is arranged in the partition wall of the case separating each phase or straddling two phases. However, the present invention is not limited to this, and the permanent magnet 41 is arranged in one phase. Only one suction rod 31 or 32 may be stretched to the other phase.

Next, an arc extinguishing chamber of the switchgear as a modification of Embodiment 23 will be described based on FIG. 28B.
The attracting rods 31, 32 and 3 shown in FIGS. 27 and 28A do not necessarily need to be surface-bonded to the magnetic pole surface of the permanent magnet 41, and by arranging the permanent magnet 41 inside the case as shown in FIG. 28B, An insulating resin material may be interposed between the permanent magnet 41 and the suction rods 31 and 32.
In this way, even when the magnetic insulating cover 3 c is damaged, it is possible to prevent a current from being short-circuited to the adjacent phase via the suction rods 31 and 32 and the permanent magnet 41.

Furthermore, an arc extinguishing chamber of the switchgear as another modification of the embodiment 23 will be described based on FIG. 28C.
Unlike the suction rods 31, 32, and 3 shown in FIGS. 27, 28A, and 28B, the lengths of the suction rods do not have to be the same in all phases, and the length of any one of the suction rods 31, 32 The length may be shorter than other suction rods.
Thus, the position of the arc extension destination is different for each phase, so that the influence of the magnetic field generated from the arc of the adjacent phase can be suppressed. Therefore, the effect of the present invention can be effectively exhibited even under a condition in which the current that increases the influence of the magnetic field due to the arc of the adjacent phase is large.
In addition, only in the phase where the short suction rod 32 is disposed, the timing at which the contact is separated may be delayed as compared with the other phases. Therefore, the arc generated in the phase where the contact is released earlier is expanded without being affected by the arc generated in the adjacent phase where the contact release timing is delayed. It is possible to perform stable shut-off.

Embodiment 24. FIG.
Next, an arc extinguishing chamber of the switchgear according to Embodiment 24 of the present invention will be described with reference to FIG.
The arc extinguishing chamber of the switchgear according to the twenty-fourth embodiment is an application example when there are a plurality of arc extinguishing spaces in one phase.
In FIG. 29, one permanent magnet 41, two arc extinguishing spaces, and an electromagnetic actuator unit 105 are accommodated in the case 101, and a movable contact 2a is provided in each arc extinguishing space. The movable contact 2 having, the fixed contact 1 having the fixed contact 1a, and the magnetic insulating cover 3c are protected from the magnetic pole surface of the permanent magnet 41 and extended between the contacts 1 and 2, and the arc. The suction bar 3 disposed in the vicinity of the generation region is provided, and the movable contact 2 can be opened by operating the electromagnetic actuator unit 105 from an external circuit (not shown).

Further, the area of the end face on the arc generation space side of the suction bar 3 is reduced from the average cross-sectional area of the suction bar 3. As a result, the lines of magnetic force distributed in the suction bar are concentrated at the tip of the suction bar 3, the magnetic flux density generated from the tip of the suction bar 3 is increased, and the arc A (not shown) located at the tip of the suction bar 3 is increased. Can be sucked into the suction bar side at high speed.
Further, the normal direction of the surface of the suction bar 3 on the arc generation space side is inclined toward the arc A generation position. That is, the magnetic flux density for attracting the arc A to the suction bar side is increased by bringing the direction of the magnetic force lines generated from the tip of the suction bar 3 close to the direction in which the arc A is generated, and on the central axis extension line of the suction bar 3. The arc A that has not been generated can be easily attracted.

  According to the twenty-fourth embodiment, the arc A generated between the two contacts 1a and 2a of the two arc extinguishing spaces is drawn into the back of the suction bar 3 and extended, and then the magnetic insulating cover 3c. It is cooled by the ablated gas from and then extinguishes. In FIG. 29, the permanent magnet 41 is disposed inside the case, but this is not a limitation. For example, the permanent magnet 41 may be disposed in one arc extinguishing space, and the suction rod 3 may be extended to the other arc extinguishing space.

Embodiment 25. FIG.
Next, Embodiment 25, which is a modification of Embodiment 24, will be described with reference to FIG. As shown in FIG. 30, the permanent magnet 41 may be arranged for each arc extinguishing space.
According to the twenty-fifth embodiment, since the magnetic lines of force generated from the permanent magnet 41 can be concentrated for each arc extinguishing space, the applicable current region can be expanded.

Embodiment 26. FIG.
Next, a twenty-sixth embodiment which is a modification of the twenty-fifth embodiment will be described with reference to FIGS.
As shown in FIGS. 31 and 32, it is not always necessary to provide a plurality of arc extinguishing spaces in one phase, and it is possible to provide only one large arc extinguishing space in which one permanent magnet 41 and attraction bar 3 are provided in one phase. good.
According to the twenty-sixth embodiment, the contact pressure for suppressing the contact force generated between the two contacts at the time of closing to less than necessary and the opening force for opening at a specified speed or more are halved. Thus, the electromagnetic actuator unit 105 can be reduced in size.
In addition, since a sufficient space for extending the arc A can be secured, contact consumption due to arc heat can be suppressed, and contact reliability can be improved.

Embodiment 27. FIG.
Next, the switchgear according to Embodiment 27 will be described with reference to FIG.
In FIG. 33, the switchgear is provided with a fixed-side terminal portion 11 and a movable-side terminal portion 12 connected to an external power circuit at both ends of a casing constituted by a case 101 made of an insulator. An arc extinguishing chamber 102 for extinguishing the arc A is provided on the terminal portion 11 side. In the arc extinguishing chamber 102, a relay unit 104 connected to the movable side terminal unit 12 for detecting an abnormal current and outputting a contact opening command is provided in the case 101 together with the opening / closing mechanism unit 103 to which the opening commander is transmitted. It is stored in. The arc extinguishing chamber 102 is provided with a fixed contact 1 to which a fixed contact 1a is fixed and a movable contact 2 to which a movable contact 2a is fixed at one end.

  In the fixed contact 1, the conductor is bifurcated from the fixed side terminal portion 11 toward the inside of the case, extends to the periphery of the rotating shaft 110 of the movable contact 2, and joins the two conductors after merging there. Folded in the direction of the fixed terminal portion 11. A fixed contact 1a and an arc runner 107 are fixed to the folded end. Although not shown, the movable contact 2 is mechanically and electrically connected to the relay unit 104. Above the fixed contact 1 is an arc extinguishing device in which a plurality of cooling plates 91 are stacked while maintaining a predetermined interval in order to cool by taking in an arc A generated between the fixed contact 1a and the movable contact 2a at the time of opening. It arrange | positions so that the front-end | tip of the movable contact 2 may be opposed.

Above the arc extinguishing chamber 102, a suction bar 3 made of a magnetic material is arranged, and a magnet 4 having a magnetic pole surface on the end surface of the suction bar 3 opposite to the surface facing the arc A generated between the two contacts 1a, 2a. Are arranged adjacent to each other (surface bonding). Therefore, by drawing the arc into the back of the suction rod 3, the arc can be easily hit against the cooling plate 91, and the reliability of interruption can be improved.
Also, the magnet 4 used in the form of FIG. 33 may be constituted by a permanent magnet 41, and by constituting the permanent magnet 41, a constant magnetic flux can be applied to the arc A. Even in a weak region (for example, less than 1 kA), stable blocking can be performed.

Further, the area of the end face on the arc generation space side of the suction bar 3 is reduced from the average cross-sectional area of the suction bar 3. As a result, the lines of magnetic force distributed in the suction bar are concentrated at the tip of the suction bar 3, the magnetic flux density generated from the tip of the suction bar 3 is increased, and an unillustrated arc located at the tip of the suction bar 3 is increased. High speed suction to the suction bar side is possible.
Further, the normal direction of the surface of the suction bar 3 on the arc generation space side is inclined toward the arc A generation position. That is, the magnetic flux density for attracting the arc A to the suction bar side is increased by bringing the direction of the magnetic force lines generated from the tip of the suction bar 3 close to the direction in which the arc A is generated, and on the central axis extension line of the suction bar 3. The arc A that has not been generated can be easily attracted.

Further, by forming the material of the cooling plate 91 from a metal material having a high thermal conductivity, the heat of the arc can be quickly transferred to the cooling plate 91 and the heat energy in the arc can be easily taken.
Furthermore, when the material of the cooling plate 91 is formed of a metal material, the arc A is divided by the cooling plate 91 as shown in FIG. 33, and the divided arc A is cooled by heat transfer to the cooling plate 91. Since the voltage drop due to the electrode drop voltage occurs at the interface between the arc A and the cooling plate 91, the action of reducing the current flowing inside the arc works.

Embodiment 28. FIG.
Next, an embodiment 28, which is a modification of the embodiment 27, will be described with reference to FIG. Hereinafter, up to the thirty-fourth embodiment is a modification of the twenty-seventh embodiment in which the arrangement position of the suction rod is changed.
First, according to the twenty-eighth embodiment, as shown in FIG. 34, members (suction bar 3, magnetic reinforcing plate 6, magnetic insulating cover 3c, permanent magnet 41) mainly composed of suction bar 3 are arc extinguishing devices. The center portion of the upper and lower ends of the fixed contact 1a and the movable contact 2a in the maximum open state is located at a position sandwiched by the cooling plate 91 in the vertical direction. Therefore, in addition to the magnetic driving force from the conductor, the arc pulling effect by the suction bar 3 acts on the arc central portion, and the arc A is expanded in the direction of the cooling plate 91 (right side in FIG. 34). The arc A can be hit against the cooling plate 91.

Embodiment 29. FIG.
Next, an embodiment 29, which is a modification of the embodiment 27, will be described with reference to FIG. According to this 29th embodiment, as shown in FIG. 35, members (suction bar 3, magnetic reinforcing plate 6, magnetic insulating cover 3c, permanent magnet 41) mainly composed of suction bar 3 are used in the arc extinguishing device. It is characterized by being arranged in the vicinity of the arc runner 107 below. Further, the structure of the stationary contact 1 is such that the permanent magnet side of the attracting rod 3 is included in the case between the conductors branched from the stationary terminal portion 11. As a result, in addition to the magnetic driving force from the conductor, the arc pulling effect by the suction bar 3 acts on the arc A in the vicinity of the arc runner 107, and the arc A at the initial opening stage is quickly driven to the back of the arc runner 107. It is possible to reduce contact wear and improve contact reliability.

Embodiment 30. FIG.
Next, a thirtieth embodiment which is a modification of the twenty-seventh embodiment will be described with reference to FIG. According to the thirtieth embodiment, as shown in FIG. 36, members (suction bar 3, magnetic reinforcing plate 6, magnetic insulating cover 3 c, permanent magnet 41) mainly composed of suction bar 3 are used in the arc extinguishing device. It is characterized in that it is arranged so that the end surface of the suction bar 3 faces downward and the end surface of the suction bar 3 is above the movable contact 2a in the maximum open state. In the thirty-third embodiment, the suction rod 3 is disposed so that a part of the suction rod 3 is included in the case 101. However, in actual application, this is not limited to this, and there is no problem with the structure disposed inside the case. . As a result, an arc pulling effect by the suction rod 3 acts on the arc A in the vicinity of the movable contact 2a, and the arc A in the vicinity of the movable contact 2a is expanded upward, thereby improving the interruption performance.

Embodiment 31. FIG.
Next, Embodiment 31 which is a modification of Embodiment 27 will be described with reference to FIG. According to the thirty-first embodiment, as shown in FIG. 37, the permanent magnet 41 is in a state where the magnetic pole surface is directed substantially in the vertical direction, and two L-shaped suction rods 3 are connected to the magnetic pole surface. The permanent magnet 41 is protected by the magnetic insulating cover 3c except for the connecting portion with the attraction bar 3, and the end of the magnetic insulating cover 3c is further extended in the direction between the contacts. ing. Furthermore, the magnetic insulating cover 3c is sandwiched between the cooling plates 91 from above and below.
As a result, the arc pulling effect of the suction bar 3 acts on the arc A in the vicinity of the movable contact 2a and the arc runner 107, and the arc A is expanded in the right direction of the arc extinguishing device. Since the insulating cover 3c protrudes, the arc A comes into contact with the same portion, and the effect of curving the arc A as an obstacle is added to improve the interruption performance.

Embodiment 32. FIG.
Next, a thirty-second embodiment which is a modification of the twenty-seventh embodiment will be described with reference to FIGS.
In the thirty-second embodiment, as shown in FIG. 38, a structure using members (suction bar 3, magnetic reinforcing plate 6, magnetic insulating cover 3c, permanent magnet 41) mainly composed of two suction bars 3 is used. These are disposed in the vicinity of the arc runner 107 outside the arc extinguishing device and the movable contact 2a at the time of maximum opening. Further, FIG. 39 shows a case where the arc extinguishing chamber is viewed from the direction of the fixed terminal portion 11, but the suction bar 3 is not shown in the figure, but the case side wall of the arc extinguishing chamber (the case wall in the front and back direction of the paper) And two suction rods 3 are arranged on opposite case side walls. (Refer to FIG. 39) As a result, the arc A is driven in different case side wall directions on the movable contact side and the arc runner side, so that the effect of extending the arc A and improving the interruption performance is obtained.

Embodiment 33. FIG.
Next, a thirty-third embodiment which is a modification of the twenty-seventh embodiment will be described with reference to FIGS.
According to the thirty-third embodiment, as shown in FIG. 40, a plurality of members (suction bar 3, magnetic reinforcing plate 6, magnetic insulating cover 3c, permanent magnet 41) mainly composed of suction bar 3 are arranged. Furthermore, these are separated from each other by an insulating plate 108 that holds the cooling plate 91.
As shown in FIG. 40, an insulating plate 108 having a suction bar 3 and a cooling plate 91 is disposed from the vicinity of the arc runner 107 to the vicinity of the movable contact 2a in the maximum open state. As a result, the arc A is drawn in the suction rod 3 and driven in the right direction in FIG. 40, and the arc A is driven in the left direction in FIG. Stretch. In addition, since the arc A is divided by the cooling plate 91 attached to the tip of the insulating plate 108 which is a protruding portion, the arc voltage is improved and the interruption performance is improved.

  In the thirty-third embodiment, these suction rods 3 and the like are arranged to extend the arc A in the direction of the fixed terminal portion 11, but the arc extinguishing chamber shown in FIG. 41 is viewed from the direction of the fixed terminal portion 11. As in the arc extinguishing chamber main part configuration, the arc A may be extended by using the rib 109 formed by attaching the suction rod 3 at right angles to the case side wall and projecting a part of the case.

Embodiment 34. FIG.
Next, an embodiment 34, which is a modification of the embodiment 27, will be described with reference to FIG.
In the thirty-fourth embodiment, a function as the suction bar 3 is added to the arc runner 107 which is a running conductor, and a magnetic pole surface is provided behind the arc runner 107 (right direction in FIG. 42) as shown in FIG. A permanent magnet 41 facing the arc runner 107 is arranged. Since the arc runner 107 has a function of holding the arc A, the arc runner 107 has a very high temperature when cut off. Therefore, a gap is provided between the arc runner 107 and the permanent magnet 41 to prevent thermal demagnetization of the permanent magnet 41. A part of permanent magnet 41 and arc runner 107 is protected from arc A by magnetic material insulating cover 3c. Furthermore, in this embodiment 34, the gap between arc runner 107 and permanent magnet 41 is also insulated for magnetic material. It is separated by a cover 3c.
With such a structure, the arc A on the fixed contact side is drawn into the suction rod 3 and further travels to the right in FIG. 42 on the arc runner 107, which is also a running conductor, thereby extending the arc A and improving the arc voltage. As a result, the shut-off performance increases.

Embodiment 35. FIG.
Next, the switchgear according to Embodiment 35 will be described with reference to FIG.
In FIG. 43, a fixed contact 1 to which a fixed contact 1a is fixed and a movable contact 2 to which a movable contact 2a is fixed are arranged on one end side. The fixed contact 1 and the movable contact 2 are mechanically connected to an external circuit. Connected electrically. Above the fixed contact 1 and the movable contact 2, a plurality of cooling plates 91 are held at predetermined intervals for taking in and cooling the arc A generated between the fixed contact 1a and the movable contact 2a at the time of opening. Arranged arc extinguishing device is arranged. The upper side of the arc extinguishing device is provided with an exhaust port (not shown), and has a structure for discharging the generated hot gas of arc A to the outside of the switchgear.

  Further, a fixed-side arc runner 107a and a movable-side arc runner 107b are respectively disposed on both sides of the arc extinguishing device. These are conductors that cause the arc A generated between the contacts to travel to the arc extinguishing device, and the fixed-side arc runner 107a extends from the vicinity of the fixed contact 1a to the arc extinguishing device. On the other hand, although not shown, the movable arc runner 107b is electrically and mechanically connected to the movable contact 2, and when the arc A on the movable contact 2 moves to the movable arc runner 107b, the movable contact 2 is It is designed to deviate from the energization path.

At the center of the arc extinguishing device, a suction bar 3 made of a magnetic material protected by an insulating magnetic insulating cover 3c is disposed, which is opposite to the surface facing the arc A generated between the two contacts 1a and 2a. A magnet 4 having a magnetic pole surface is disposed adjacent (surface bonded) to the end surface of the suction bar 3 on the side, and a magnetic reinforcing plate 6 is provided on the opposite side of the suction surface of the suction bar 3 and the magnet 4.
Further, a part of the suction rod 3 includes an arc holding portion 106 that is not protected by the magnetic insulating cover 3c. As a result, when the arc A drawn by the suction bar 3 reaches a portion that is not protected by the magnetic insulating cover 3c, the arc A forms a spot and is maintained stably.

Next, the arc extinguishing process in the current interruption of the embodiment 35 will be described below.
When the switchgear opens, an arc A is generated between the fixed contact 1a and the movable contact 2a that have been contacted and energized. The arc A is a magnetic driving force exerted by the current flowing through the fixed contact 1 and the movable contact 2, the pressure inside the arc extinguishing chamber increases due to the generation of the arc, the gas flow accompanying the hot gas exhaust to the outside of the case, the cooling plate 91 The magnetic attraction force and the like act on the arc extinguishing device. For this reason, when the arc A on the fixed contact 1a moves to the fixed arc runner 107a having a continuous conductor structure, the arc A on the movable contact side opens and the movable contact 2a and the movable arc runner 107b come close to each other. The arc A commutates to the arc runner near the movable contact.

  When the fixed-side and movable-side arcs A move to the arc runner, as shown in the first embodiment, the arc A on the arc runner is directed in the direction of the cooling plate 91 (FIG. The upper part of the arc is drawn into the center of the arc extinguishing device and maintained by the arc holding part 106, and the arc A on the fixed side and movable side arc runners also moves upward. The whole is divided by the cooling plate 91. The suction rod 3 can stably strike the arc A against the cooling plate 91, thereby obtaining an effect of improving the shut-off performance.

  The magnet 4 can be selected from the permanent magnet 41 or the electromagnet 5 depending on the current region to be cut off. In a relatively small current region, the arc A can be quickly attracted by the permanent magnet 41, and a relatively large current can be obtained. By using the electromagnet 5 in the region, it is possible to perform the stable attraction of the arc A without the magnet being thermally demagnetized.

Embodiment 36. FIG.
Next, the switchgear according to Embodiment 36 will be described with reference to FIG.
In FIG. 44, the switchgear is provided with a terminal portion connected to an external power circuit at both ends of a casing constituted by a case made of an insulator, and the first fixed contact is provided at the terminal portion of the one end portion. The first fixed contact 1 provided with 1a is connected, and the second fixed contact 1 provided with the second fixed contact 1a is provided at the terminal portion at the other end, and the two fixed contacts 1a and An arc extinguishing chamber for extinguishing the arc A is provided in the vicinity of the tips of the two fixed contacts 1.

  The arc-extinguishing chamber houses a relay unit (not shown) that detects an abnormal current and outputs an opening command, an opening / closing mechanism unit (not shown) that includes a rotation mechanism that is a transmission destination of the opening command. ing. In the arc extinguishing chamber, a movable contact 2 having two movable contacts 2a is disposed opposite to the fixed contact 1, and two movable contacts are provided when the switchgear is in a closed state. The contact 2 a and the two fixed contacts 1 a come into contact with each other, and electricity is passed between the fixed contacts 1 and 2 via the movable contact 2. Above each fixed contact 1, the arc A generated between the fixed contact 1 a and the movable contact 2 a at the time of opening is taken in and cooled. The device is arranged so as to face each tip of the movable contact 2.

  Further, a suction rod 3 made of a magnetic material is sandwiched between the respective tip portions of the movable contact 2 at the time of opening at a position facing the movable contact 2 in the maximum open state above the arc extinguishing chamber device. A magnet 4 having a magnetic pole surface adjacent to the end surface of the suction bar 3 opposite to the surface facing the arc A generated between the two contacts is disposed adjacent (surface-bonded). (The attraction bar 3 is surface-bonded to the magnetic pole surface of the magnet 4).

Next, the arc extinguishing process in current interruption in Embodiment 36 will be described below.
In FIG. 44 (a), when the switchgear is opened, an arc A is generated between the fixed and movable contacts 1a and 2a that are in contact and energized. In both arcs A, the magnetic driving force exerted by the current flowing through the stationary contact 1 and the movable contact 2, the pressure inside the arc extinguishing chamber rises due to the generation of the arc, the gas flow accompanying the hot gas exhaust to the outside of the case, the cooling A magnetic attraction force or the like of the plate 91 acts to drive the arc extinguishing device. Since the energization directions flowing inside the arcs are opposite, a repulsive force acts on each of them, and when one arc A is drawn into the cooling plate 91, the other arc A is detached from the cooling plate 91. Since both of the arcs A are divided by the cooling plate 91 because they are driven, both the arcs can be obtained when the effect of pulling in the arc by the suction rod 3 is superimposed as described in the first embodiment. Since A is extended in the direction of the cooling plate 91 (to the right in FIG. 44) and the arc A is stably divided by the cooling plate 91, the reliability of interruption can be improved.

Next, in FIG. 44 (b), when the arc extinguishing process of the arc A proceeds, the respective arcs A drawn into the back of the suction rod 3 merge and are energized without going through the movable contact 2. Become. In this state, it becomes easier to divide the arc A on the cooling plate 91, and wear of the movable contact 2a and the movable contact 2 can be suppressed. Can be improved.
In addition, since the cooling effect to the arc A is superimposed near the suction bar by protecting the insulating magnetic insulating cover 3c around the suction bar 3, it is possible to further improve the reliability of the interruption.
In FIG. 44, all of the suction rod 3 is protected by the magnetic insulating cover 3c. However, the suction rod 3 is connected to the movable contact 2 by a conductor to have the same potential, and a part of the suction rod 3 is arc A. It is possible to further suppress wear of the contacts by allowing the arc A to commutate to the suction rod 3 by exposing the contact to the suction rod 3.

  In FIG. 44, the suction bar 3 is installed at the opposite part of the tip of the movable contact when the pole is opened. However, the position is not limited to this, and for example, the suction bar 3 and the magnet 4 are located near the fixed contact. May be arranged. When the attracting rod 3 and the magnet 4 are arranged in the vicinity of the fixed contact, the arc A can be promptly attracted at the time of opening, and the arc A can be divided by the arc extinguishing plate from the beginning of opening.

  It should be noted that within the scope of the present invention, the embodiments can be combined, or the embodiments can be appropriately modified and omitted.

  The present invention is useful as a switching device such as a switch, a switch, a magnetic contactor, or a relay for cutting off current.

A: Arc, M: Magnetic field lines, 1: Fixed contact, 1a: Fixed contact
2: movable contact, 2a: movable contact, 11: fixed terminal portion,
12: movable side terminal, 15: flexible conductor, 3: suction bar, 1, 32: suction bar,
3c: insulating cover for magnetic material, 3cc: thickness of insulating cover for magnetic material,
3d: concavo-convex portion of insulating cover for magnetic material, 3e: concave slit, 4: magnet,
41: permanent magnet, 4c: magnet cover, 4d: uneven portion of the magnet cover,
42: bar magnet, 5: electromagnet, 5A: first electromagnet (suction bar side electromagnet),
5B: 2nd electromagnet (anti-attraction rod side electromagnet), 6: Magnetic reinforcing plate,
6c: magnetic reinforcing plate cover, 7: magnetic yoke, 7c: magnetic yoke cover,
67: Magnetic reinforcing plate and magnetic yoke, 8: Magnetic induction plate,
8c: magnetic induction plate cover, 9: cooling rod, 91: cooling plate,
100: switchgear, 101: case, 102: arc extinguishing chamber,
103: Opening / closing mechanism unit, 104: Relay unit,
105: Electromagnetic actuator part, 106: Arc holding part,
107: Arc runner, 107a: Fixed side arc runner,
107b: movable arc runner, 108: insulating plate, 109: rib,
110: rotating shaft, 111: traveling electric circuit.

Closer according to the present invention includes a stationary contactor having a stationary contact, a movable contact having a movable contact, a switching mechanism portion for opening and closing operation of the fixed contact and the movable contact, the fixed contact and the movable a magnet for generating a magnetic field for stretching the arc generated between the fixed contact and the movable contact during opening of the contact point, the elongated magnetic having one end in contact with the pole face of the magnet, a closing device comprising a second end portion of the magnetic body is disposed so as to be close to the arcing region between the fixed contact and the moving contact, the arc, the magnetic field generated by the magnet Thus, the magnetic material is stretched along the side surface in the longitudinal direction .

Claims (33)

  A fixed contact having a fixed contact; a movable contact having a movable contact; an open / close mechanism for performing an opening / closing operation between the fixed contact and the movable contact; and the fixed contact when the fixed contact and the movable contact are separated. A switching device comprising: a magnet that generates a magnetic field for extending an arc generated between the contact and the movable contact; and a long magnetic body having one end in contact with the magnetic pole surface of the magnet, The other end of the magnetic body is disposed so as to be close to an arc generation region between the fixed contact and the movable contact, and the arc is generated in the longitudinal direction of the magnetic body by a magnetic field generated by the magnet. An opening and closing device that is extended along a side surface.   The switchgear according to claim 1, wherein the switchgear includes an arc extension space, and the magnet is disposed in the arc extension space.   The switchgear according to claim 1 or 2, wherein an insulating resin material is interposed between the magnet and the magnetic body.   The coiled conductor is wound around the other end portion of the magnetic body, and at least a part of the magnetic body is configured as a first electromagnet of the magnet. Switchgear.   The switchgear according to claim 4, wherein the magnet is a permanent magnet.   6. The switchgear according to claim 5, wherein a second electromagnet capable of generating a magnetic force line is arranged on the other magnetic pole surface of the permanent magnet in a direction to cancel the magnetic force line generated from the first electromagnet.   The switchgear according to any one of claims 1 to 6, wherein the other end portion of the magnetic body has a tapered portion whose cross-sectional area is gradually reduced toward the tip end portion.   The switchgear according to any one of claims 1 to 7, wherein the one end portion of the magnetic body is an enlarged portion whose cross-sectional area is gradually expanded toward the end portion.   The switchgear according to claim 7 or 8, wherein the taper of the magnetic body is inclined.   The switchgear according to any one of claims 1 to 9, wherein at least a part of the outer peripheral surface of the magnetic body is covered with a magnetic insulating cover.   11. The switchgear according to claim 10, wherein the insulating cover for magnetic material has a thick cover in the vicinity of a contact surface between the magnetic material and the magnet.   The switchgear according to claim 10 or 11, wherein at least a part of the outer peripheral surface of the insulating cover for magnetic material is formed in a concave shape or a convex shape.   A cooling plate or a cooling rod is disposed in at least a part of the arc extension space that extends to the outer surface of the magnetic body or the insulating cover for the magnetic body so as to collide with the arc. The switchgear according to any one of claims 1 to 12.   The switchgear according to claim 13, wherein the cooling plate or the cooling rod is made of a metal material.   The switchgear according to claim 13, wherein the cooling plate or the cooling rod is formed of a fusible resin material.   A magnetic yoke formed of a magnetic material is disposed in at least a part of the arc extension space extending on the outer surface of the magnetic material or the insulating cover for the magnetic material, and the magnetic yoke and the magnetic material or the The switchgear according to any one of claims 10 to 15, wherein the arc extension space is sandwiched between the insulating cover for magnetic material.   The switchgear according to claim 16, wherein at least a part of the arc exposed surface of the magnetic yoke is covered with an insulating magnetic yoke cover.   The switchgear according to any one of claims 1 to 17, wherein at least a part of the magnet is covered with an insulating magnet cover.   The switchgear according to any one of claims 1 to 18, wherein a magnetic reinforcing plate made of a magnetic material is provided on the other magnetic pole surface of the magnet.   The switchgear according to claim 19, wherein the magnetic reinforcing plate is stretched and enlarged in a direction approaching the arc generation region.   The switchgear according to any one of claims 16, 17, 19, and 20, wherein the magnetic reinforcing plate is formed integrally with the magnetic yoke.   The said magnetic reinforcement board covered at least one part of the exposed surface which faces the said arc generation | occurrence | production area | region side with the insulating magnetic reinforcement board cover, The any one of Claims 19-21 characterized by the above-mentioned. Switchgear.   In the arc generation region between the fixed contact and the movable contact, a magnetic induction plate made of a magnetic material is provided opposite to one end of the magnetic material, and between the magnetic induction plate and the magnetic material. The magnetic induction plate cover covers at least a part of the exposed surface facing the arc generation region of the magnetic induction plate while sandwiching the arc generation region. The switchgear according to item 1.   24. The switchgear according to claim 23, wherein the magnetic induction plate is disposed so as to sandwich the arc generation region on both sides of the arc generation region between the fixed contact and the movable contact.   The magnetic material insulating cover, the magnet cover, the magnetic yoke cover, the magnetic reinforcing plate cover, and the magnetic induction plate cover are integrally formed as a set of any two members. The switchgear according to any one of claims 10 to 13, claim 16 to claim 18, and claim 22 to 23.   At least one member of the insulating cover for magnetic material, the magnet cover, the magnetic yoke cover, the magnetic reinforcing plate cover, and the magnetic induction plate cover is formed of a fusible resin material. The switchgear according to any one of claims 10 to 13, claim 16 to claim 18, and claim 22 to 23.   At least one member of the insulating cover for magnetic material, the magnetic yoke cover, the magnetic reinforcing plate cover, and the magnetic induction plate cover is made of a material having a melting point lower than that of the magnet cover. The switchgear according to any one of claims 10 to 13, 16 to 18, and 22 to 23.   A plurality of pairs of the fixed contact and the movable contact are provided, and the magnetic body is branched into a plurality or provided, and each other end of the magnetic body has a plurality of the fixed contacts. A plurality of arc generation regions generated between a child and the movable contact are brought close to each other, and one end of each of the magnetic bodies is in contact with one of the magnetic pole surfaces of the magnet. The switchgear according to any one of claims 27.   Two or more pairs of contacts that are electrically connected to the outer conductor and are detachable, and a plurality of long lengths for extending two or more of the arcs generated between the two or more of the contacts 29. The switchgear according to any one of claims 1 to 28, further comprising: a magnetic body, wherein any one of the magnetic bodies is shorter than another magnetic body.   The timing at which at least a pair of movable contacts of a plurality of pairs of the fixed contact and the movable contact is opened is delayed from that of the other pairs of movable contacts. The switchgear according to any one of claims 29.   A fixed contact having a fixed contact; a movable contact having a movable contact; an opening / closing mechanism for performing an opening / closing operation between the fixed contact and the movable contact; and an arc generated between the fixed contact and the movable contact An opening / closing device comprising an arc extension space for extending the arc and a bar magnet for generating a magnetic field for extending the arc, wherein the longitudinal side surface of the bar magnet is protected by an insulating magnet cover, One end of the magnetic pole surface of the bar magnet is disposed in the arc extension space so as to be close to an arc generation position located between the fixed contact and the movable contact, and the arc is generated by the bar magnet. An opening / closing device that is stretched and wound along a longitudinal side surface of the bar magnet by a magnetic field.   32. The switchgear according to claim 31, wherein at least a part of the magnet cover is provided with a concave portion or a convex portion for drawing and compressing the arc.   A fixed contact having a fixed contact; a movable contact having a movable contact; an opening / closing mechanism for performing an opening / closing operation between the fixed contact and the movable contact; and an arc generated between the fixed contact and the movable contact An opening / closing device comprising: an arc extension space for extending the arc; and a magnet for generating a magnetic field for extending the arc, wherein the magnet is disposed at an arc extension destination of the arc extension space, Insulating uneven magnet cover is provided on a side surface other than the magnetic pole surface, and the arc is drawn into the recess of the magnet cover and compressed by the magnetic field generated by the magnet. apparatus.

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