JP2016162585A - Breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized breaker having high cut-off performance.SOLUTION: This breaker is equipped with an arc-extinguishing chamber 130 for extinguishing an arc generated between a stationary contact and a movable contact. The arc-extinguishing chamber includes a first grid support 141, a second grid support 142, and a grid barrier, a plurality of first grids 131, and a plurality of second grids 132. Each of the plurality of the first grids includes a first grid base part 131t, and a first extension part 131s. Each of the plurality of the second grids includes a second grid base part 132t, and a second grid extension part 132s. In the plurality of the first grids and the plurality of the second grids, the first grids and the second grids are alternately disposed so that their positions in the height direction of the arc-extinguishing chamber are different from each other. The movable contact passes between the first grid extension part of each of the plurality of the first grids and the second grid extension part of each of the plurality of the second grids along the height direction of the arc-extinguishing chamber.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a circuit breaker, and more particularly to a circuit breaker used as a circuit breaker for wiring or a circuit breaker.

  In recent years, along with the increase in capacity and space saving of low-voltage wiring equipment, there is a demand for a small circuit breaker with high breaking performance. Japanese Unexamined Patent Application Publication No. 2014-154492 (Patent Document 1) is a prior art document that discloses the configuration of a circuit breaker that improves the breaking performance in a limited dimension. The circuit breaker described in Patent Document 1 includes a stationary contact having a fixed contact, a movable contact having a movable contact that can be moved toward and away from the fixed contact, and an arc generated when the current is interrupted in the main body case. An arc extinguishing chamber in which a plurality of grids for extinguishing arcs are arranged in layers at predetermined intervals, and an exhaust port for discharging arc gas to the outside. The plurality of grids include a conductor plate having a grid base portion on the exhaust port side, a grid leg portion having a notch portion through which the movable contactor is inserted on the movable contact side, and the conductor plate connected to the bottom portion of the notch portion. And an insulating covering portion that covers the arc moving portion with the grid base exposed. The arc moving part is formed in an asymmetric shape across the rotating surface of the movable contact.

JP 2014-154492 A

  In the circuit breaker described in Patent Document 1, the arc generated between the fixed contact and the movable contact is magnetized by the magnetic field from the conductor or the magnetic field of the arc itself, and thus along the arc moving part. Extends to the exhaust side. For this reason, the arc moving part is exposed to a high-temperature arc generated when the current is interrupted and locally becomes hot and partially melts. When the grid is melted and electrically connected to another adjacent grid, the obtained electrode drop voltage is reduced and the breaking performance of the circuit breaker is lowered.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a small circuit breaker having a high breaking performance.

  A circuit breaker according to the present invention extinguishes an arc generated between a fixed contact having a fixed contact, a movable contact having a movable contact that can be moved toward and away from the fixed contact, and the fixed contact and the movable contact. Arc extinguishing chamber. The arc extinguishing chamber has a plate-like shape and is opposed to each other in the width direction of the arc extinguishing chamber and is opposed to each other in each of the first grid support and the second grid support. In a region surrounded by a plate-like grid barrier that closes one end in the depth direction of the arc extinguishing chamber and the first grid support, the second grid support, and the grid barrier, the arc extinguishing chamber is spaced apart from each other in the height direction. A plurality of first grids that are fixed in order to the first grid support, and a second grid that is spaced from each other in the height direction in an area surrounded by the first grid support, the second grid support, and the grid barrier. And a plurality of second grids fixed in order to the support. Each of the plurality of first grids extends toward the other end side in the depth direction while being in contact with the first grid support from the first grid base portion located on one end side in the depth direction. In addition, the first grid extending portion having a width narrower than that of the first grid base portion is included. Each of the plurality of second grids extends toward the other end side in the depth direction while being in contact with the second grid support from the second grid base portion located on one end side in the depth direction. And the 2nd grid extending part whose width is narrower than the 2nd grid base part is included. In the plurality of first grids and the plurality of second grids, the first grids and the second grids are alternately arranged so that the positions in the height direction are different from each other. The movable contact passes along the height direction between the first grid extending portion of each of the plurality of first grids and the second grid extending portion of each of the plurality of second grids.

  According to this invention, since the 1st grid and the 2nd grid are alternately arrange | positioned so that the position of a height direction may each differ, 1st grids or 2nd grids are electrically connected. This can be suppressed. Thereby, it can suppress that the electrode drop voltage obtained falls and can improve the interruption | blocking performance of a circuit breaker. By increasing the breaking performance of the breaker, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic load to the structure of the circuit breaker can be reduced, the bulk of the structure can be reduced, and the circuit breaker can be downsized.

It is a side view which shows the structure of the circuit breaker which concerns on Embodiment 1 of this invention. It is a partial front view of the circuit breaker which concerns on Embodiment 1 of this invention, and is the figure seen from the arrow II direction of FIG. It is a partial perspective view of the circuit breaker concerning Embodiment 1 of the present invention, and is the figure seen from the direction of arrow III of Drawing 1. It is a perspective view which shows the shape of the 1st grid mentioned later of the circuit breaker which concerns on Embodiment 1 of this invention. It is a perspective view which shows the shape of the 2nd grid mentioned later of the circuit breaker which concerns on Embodiment 1 of this invention. It is a partial front view of the circuit breaker concerning Embodiment 2 of the present invention. It is a partial front view of the circuit breaker concerning Embodiment 3 of the present invention. It is a partial front view of the circuit breaker concerning Embodiment 4 of the present invention. It is a partial front view of the circuit breaker concerning Embodiment 5 of the present invention. It is a partial front view of the circuit breaker concerning Embodiment 6 of the present invention. It is a partial top view of the circuit breaker concerning Embodiment 7 of the present invention.

  Hereinafter, a circuit breaker according to each embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a side view showing a configuration of a circuit breaker according to Embodiment 1 of the present invention. 2 is a partial front view of the circuit breaker according to Embodiment 1 of the present invention, as viewed from the direction of arrow II in FIG. FIG. 3 is a partial perspective view of the circuit breaker according to the first embodiment of the present invention, as viewed from the direction of arrow III in FIG. FIG. 4 is a perspective view showing the shape of a first grid, which will be described later, of the circuit breaker according to Embodiment 1 of the present invention. FIG. 5 is a perspective view showing the shape of a second grid, which will be described later, of the circuit breaker according to Embodiment 1 of the present invention.

  As shown in FIGS. 1 to 5, the circuit breaker 100 according to the first embodiment of the present invention includes a fixed contact 120 having a fixed contact 122 and a movable contact having a movable contact 112 that can be moved toward and away from the fixed contact 122. A child 110 and an arc extinguishing chamber 130 for extinguishing an arc generated between the fixed contact 122 and the movable contact 112 are provided.

  Each of the fixed contact 120, the movable contact 110, and the arc extinguishing chamber 130 is disposed in a container (not shown). The container is comprised with the insulator. In the container, there are arranged a relay unit (not shown) that detects an abnormal current and issues a contact opening command, and an opening and closing mechanism unit (not shown) that opens the movable contact 110 in response to the opening command from the relay unit. ing. The container is provided with a discharge portion for discharging the arc gas in the container to the outside.

  The movable contact 110 includes a rod-shaped portion 111, a movable contact 112 provided below one longitudinal end of the rod-shaped portion 111, and a support shaft 113 that penetrates the other longitudinal end of the rod-shaped portion 111. . The support shaft 113 is fixed to the container, and supports the rod-like portion 111 so as to be rotatable in the circumferential direction of the support shaft 113 as indicated by an arrow 114 in FIG. The movable contact 112 is made of a sintered body of tungsten or zinc oxide and silver.

  The fixed contact 120 includes a plate-like portion 121 and a fixed contact 122 provided on one end portion in the longitudinal direction of the plate-like portion 121. The plate-like portion 121 is made of a conductor. The plate-like portion 121 is bent in a crank shape, and the other end portion in the longitudinal direction is located above the one end portion. The other end in the longitudinal direction of the plate-like part 121 is a power supply side terminal. The fixed contact 122 is disposed at a predetermined position on the rotation locus 112 a of the movable contact 112. The fixed contact 122 is made of a sintered body of tungsten or zinc oxide and silver.

  An arc induction conductor 160 is disposed on the stationary contact 120. The arc induction conductor 160 is a bent portion of the plate-like portion 121 from the position adjacent to the fixed contact 122 on the plate-like portion 121 toward the other end side of the plate-like portion 121 along the longitudinal direction of the plate-like portion 121. It extends to the vicinity. The arc induction conductor 160 is electrically connected to the plate-like portion 121 and has the same potential as the plate-like portion 121.

  The arc extinguishing chamber 130 is disposed at a position surrounding the rotation locus 112 a of the movable contact 112. The arc extinguishing chamber 130 is disposed above the fixed contact 122 and the arc induction conductor 160 so that the depth direction L of the arc extinguishing chamber 130 is parallel to the longitudinal direction of the plate-like portion 121. On one end side in the depth direction L of the arc extinguishing chamber 130, the container discharge portion is located.

  The arc extinguishing chamber 130 includes a pair of grid supports 140 each having a plate shape and facing each other with a gap in the width direction W of the arc extinguishing chamber 130 and spaced apart from each other. Including.

  The arc extinguishing chamber 130 further includes a plate-like grid barrier 150 that closes between the ends in the depth direction L of the arc extinguishing chamber 130 in each of the first grid support 141 and the second grid support 142.

  In the circuit breaker 100 according to the present embodiment, the grid barrier 150 is connected to the lower end of the arc extinguishing chamber 130 in the height direction H in each of the first grid support 141 and the second grid support 142. Yes. The grid barrier 150 is made of an insulating elastic body such as polyamide.

  The grid barrier 150 is provided so as to be elastically deformable by the pressure of the arc gas in the arc extinguishing chamber 130. Specifically, in the grid barrier 150, a portion other than the connection portion with each of the first grid support 141 and the second grid support 142 is bent toward one end side in the depth direction L of the arc extinguishing chamber 130, and the first grid support 141 and the second grid support 142 are bent. The support 141 and the second grid support 142 are provided so as to be separated from each other. The grid barrier 150 is disposed at a position where the arc gas discharged from the arc extinguishing chamber 130 flows toward the discharge portion of the container.

  The arc-extinguishing chamber 130 is arranged in the order of the first grid support 141 at intervals in the height direction H of the arc-extinguishing chamber 130 in the region surrounded by the first grid support 141, the second grid support 142 and the grid barrier 150. It further includes a plurality of fixed first grids 131.

  The arc extinguishing chamber 130 includes a plurality of the arc extinguishing chambers fixed in order to the second grid support 142 at intervals in the height direction H in an area surrounded by the first grid support 141, the second grid support 142, and the grid barrier 150. A second grid 132 is further included.

  In the plurality of first grids 131 and the plurality of second grids 132, the first grids 131 and the second grids 132 are alternately arranged so that the positions of the arc extinguishing chamber 130 in the height direction H are different from each other.

  In the circuit breaker 100 according to the present embodiment, the plurality of first grids 131 are evenly arranged for each distance La in the height direction H of the arc extinguishing chamber 130. The plurality of second grids 132 are equally arranged for each distance La in the height direction H of the arc extinguishing chamber 130. In the height direction H of the arc extinguishing chamber 130, one second grid 132 is arranged at a position intermediate between the adjacent first grids 131. However, the arrangement intervals of the first grid 131 and the second grid 132 are not limited to be equal, and may be unequal.

  The number of each of the first grid 131 and the second grid 132 is appropriately set as many as necessary to ensure the breaking performance of the breaker 100. Each of the first grid 131 and the second grid 132 is made of iron which is a ferromagnetic material.

  As shown in FIGS. 3 and 4, each of the plurality of first grids 131 includes a first grid base 131 t located on one end side in the depth direction L of the arc extinguishing chamber 130, and the first grid base 131 t to the first grid. A first grid extending part 131 s extending toward the other end side in the depth direction L of the arc extinguishing chamber 130 while being in contact with the support 141 and having a width narrower than the first grid base part 131 t is included.

  Each of the plurality of first grids 131 is in contact with the first grid support 141 at the side surface 131p. Each of the plurality of first grids 131 is joined to the first grid support 141. Each of the plurality of first grids 131 is in contact with the grid barrier 150 at the end face 131q. Each of the plurality of first grids 131 is provided so as to be able to contact and separate from the grid barrier 150.

  The first grid base 131t is a rectangular parallelepiped portion. The first grid extending portion 131s is composed of a root portion that becomes narrower as it is away from the first grid base portion 131t, and a tip portion that is located on the tip side of the root portion and extends with a certain width. ing. A side surface opposite to the side surface 131p in the root portion is curved convexly toward the side surface 131p.

  As shown in FIGS. 3 and 5, each of the plurality of second grids includes a second grid base 132 t located on one end side in the depth direction L of the arc extinguishing chamber 130, and a second grid support from the second grid base 132 t. 142 includes a second grid extending part 132 s that extends toward the other end side in the depth direction L of the arc extinguishing chamber 130 while being in contact with 142 and has a width narrower than that of the second grid base part 132 t.

  Each of the plurality of second grids 132 is in contact with the second grid support 142 at the side surface 132p. Each of the plurality of second grids 132 is joined to the second grid support 142. Each of the plurality of second grids 132 is in contact with the grid barrier 150 at the end face 132q. Each of the plurality of second grids 132 is provided so as to be able to contact and separate from the grid barrier 150.

  The second grid base 132t is a rectangular parallelepiped portion. The second grid extending portion 132s is composed of a root portion that becomes narrower as it is away from the second grid base portion 132t, and a tip portion that is located on the tip side of the root portion and extends with a certain width. ing. A side surface opposite to the side surface 132p in the root portion is curved convexly toward the side surface 132p.

  In the circuit breaker 100 according to the present embodiment, the first grid 131 and the second grid 132 have the same shape. That is, the first grid 131 and the second grid 132 are arranged in opposite directions. However, the first grid 131 and the second grid 132 may have different shapes. The shape of each of the first grid 131 and the second grid 132 is not limited to the above.

  When viewed from the height direction H of the arc extinguishing chamber 130, the plurality of first grids 131 and the plurality of second grids 132 overlap each other in the width direction W of the arc extinguishing chamber 130. Specifically, as viewed from the height direction H of the arc extinguishing chamber 130, a part of the first grid base 131t and a part of the second grid base 132t overlap each other.

  As shown in FIG. 2, the shortest distance between the first grid 131 and the second grid 132 adjacent in the height direction H of the arc-extinguishing chamber 130 overlaps each other when viewed from the height direction H of the arc-extinguishing chamber 130. This is a distance Lb between a part of the first grid base 131t and a part of the second grid base 132t.

  The shortest distance La between the first grids 131 is longer than the shortest distance Lb between the first grid 131 and the second grid 132. The shortest distance La between the second grids 132 is longer than the shortest distance Lb between the first grid 131 and the second grid 132.

Hereinafter, the operation of the circuit breaker 100 according to the present embodiment will be described.
When the relay unit detects an abnormal current (overcurrent), it sends a station opening command to the switching mechanism unit. In response to the station opening command from the relay unit, the opening / closing mechanism unit causes the movable contactor 110 to perform the opening operation. When the movable contact 110 starts the opening operation, an arc 10 is generated between the movable contact 112 and the fixed contact 122 separated from each other as shown in FIGS.

  The movable contact 112 that is separated from the fixed contact 122 has a first grid extending portion 131s of each of the plurality of first grids 131 and each of the plurality of second grids 132, as indicated by the rotation locus 112a of FIG. It passes along the height direction H of the arc extinguishing chamber 130 between the second grid extending portions 132s.

  When the movable contactor 110 starts the opening operation, the grid barrier 150 closes between the ends in the depth direction L of the arc extinguishing chamber 130 in each of the first grid support 141 and the second grid support 142. Thereby, discharge | emission from the discharge part of the arc gas in the arc-extinguishing chamber 130 is suppressed.

  The arc 10 generated between the movable contact 112 and the fixed contact 122 has a driving force due to a pressure gradient of the arc gas and an electromagnetic force caused by a magnetic field generated by an abnormal current flowing through the movable contact 110 and the fixed contact 120. Is driven to one end side in the depth direction L of the arc-extinguishing chamber 130 by the action of the driving force or the like.

  When the arc 10 is driven to one end side in the depth direction L of the arc extinguishing chamber 130, the pressure of the arc gas in the arc extinguishing chamber 130 rises, so that the grid barrier 150 is extinguished as indicated by an arrow 152 in FIG. The chamber 130 is bent toward one end side in the depth direction L and is separated from the first grid support 141 and the second grid support 142.

  Thereby, since the rise in the pressure in the arc extinguishing chamber 130 is suppressed, it is possible to suppress the generation of a driving force that pushes the arc 10 back between the movable contact 112 and the fixed contact 122. As a result, it is possible to suppress a decrease in the arc voltage.

  The arc 10 driven to one end side in the depth direction L of the arc extinguishing chamber 130 is attracted to the first grid 131 in the vicinity of the first grid 131 and is attracted to the second grid 132 in the vicinity of the second grid 132. Therefore, as shown in FIG. 2, the arc 10 has a portion 10a that is convexly curved toward the first grid 131 and a portion 10b that is convexly curved toward the second grid 132. It is stretched. As a result, the arc voltage increases.

  Furthermore, the arc 10 is divided by the arc current flowing through each of the plurality of first grids 131 and the plurality of second grids 132. Thereby, an electrode drop voltage is generated and the arc voltage is further increased. In this way, the current flowing through the short circuit is limited, and the arc voltage exceeds the power supply voltage, so that the arc 10 loses current and heat rapidly and is extinguished.

  As the arc 10 is extinguished and the pressure in the arc extinguishing chamber 130 decreases, the grid barrier 150 is caused by its own elastic force so that the depth of the arc extinguishing chamber 130 in each of the first grid support 141 and the second grid support 142 is increased. It returns to a shape that closes between the ends in the direction L. As a result, the grid barrier 150 can be made to repeatedly function even when performing a plurality of shut-off operations.

  In the circuit breaker 100 according to the present embodiment, the first grid 131 and the second grid 132 are alternately arranged so that the positions of the arc extinguishing chamber 130 in the height direction H are different from each other. The shortest distance La between the extending portions 131 s and the shortest distance La between the second grid extending portions 132 s can be increased.

  As described above, the movable contact 112 passes between the first grid extending part 131s and the second grid extending part 132s. Therefore, each of the first grid extending portion 131s and the second grid extending portion 132s is exposed to the high-temperature arc 10 for a long time, and is locally melted at a high temperature.

  By increasing the shortest distance La between the first grid extending portions 131s, it is possible to suppress the first grids 131 from being electrically connected to each other. It is possible to suppress the second grids 132 from being electrically connected by increasing the shortest distance La between the second grid extending parts 132s.

  As a result, it is possible to suppress the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 130 and to improve the breaking performance of the circuit breaker 100. By increasing the breaking performance of the breaker 100, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 100 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 100 can be downsized.

  Hereinafter, the circuit breaker according to Embodiment 2 of the present invention will be described. In addition, since the circuit breaker 200 which concerns on this embodiment differs from the circuit breaker 100 which concerns on Embodiment 1 only in the shape of a grid, description is not repeated about another structure.

(Embodiment 2)
FIG. 6 is a partial front view of a circuit breaker according to Embodiment 2 of the present invention. In FIG. 6, the figure which looked at the circuit breaker 200 from the same direction as FIG. 2 is shown. As shown in FIG. 6, the circuit breaker 200 according to Embodiment 2 of the present invention includes an arc extinguishing chamber 230.

  The arc-extinguishing chamber 230 is sequentially fixed to the first grid support 141 at intervals in the height direction H of the arc-extinguishing chamber 230 in an area surrounded by the first grid support 141, the second grid support 142, and the grid barrier. The plurality of first grids 231 are included.

  The arc extinguishing chamber 230 includes a plurality of first arcs fixed in order to the second grid support 142 at intervals in the height direction H in an area surrounded by the first grid support 141, the second grid support 142, and the grid barrier. 2 grids 232 are included.

  In the plurality of first grids 231 and the plurality of second grids 232, the first grid 231 and the second grid 232 are alternately arranged so that the positions of the arc extinguishing chamber 230 in the height direction H are different from each other.

  In the circuit breaker 200 according to the present embodiment, the plurality of first grids 231 are equally arranged for each distance La in the height direction H of the arc extinguishing chamber 230. The plurality of second grids 232 are equally arranged for each distance La in the height direction H of the arc extinguishing chamber 230. In the height direction H of the arc extinguishing chamber 230, one second grid 232 is arranged at a position intermediate between the adjacent first grids 231.

  Each of the plurality of first grids 231 includes a first grid base portion 231t positioned on one end side in the depth direction L of the arc extinguishing chamber 230, and the arc extinguishing chamber 230 while being in contact with the first grid support 141 from the first grid base portion 231t. Including a first grid extending portion 231s extending toward the other end side in the depth direction L and having a width narrower than that of the first grid base portion 231t. A side portion of the first grid base portion 231t opposite to the first grid support 141 side has a tapered shape.

  Each of the plurality of second grids includes a second grid base 232t positioned on one end side in the depth direction L of the arc extinguishing chamber 230, and the arc extinguishing chamber 230 while being in contact with the second grid support 142 from the second grid base 232t. A second grid extending portion 232s extending toward the other end side in the depth direction L and having a width narrower than that of the second grid base portion 232t is included. A side portion of the second grid base portion 232t opposite to the second grid support 142 side has a tapered shape.

  In the circuit breaker 200 according to the present embodiment, the first grid 231 and the second grid 232 have the same shape. That is, the first grid 231 and the second grid 232 are arranged in opposite directions.

  When viewed from the height direction H of the arc extinguishing chamber 230, the plurality of first grids 231 and the plurality of second grids 232 overlap each other in the width direction W of the arc extinguishing chamber 230. Specifically, when viewed from the height direction H of the arc extinguishing chamber 230, a part of the first grid base 231t and a part of the second grid base 232t overlap each other.

  As shown in FIG. 6, the shortest distance between the first grid 231 and the second grid 232 adjacent in the height direction H of the arc extinguishing chamber 230 overlaps each other when viewed from the height direction H of the arc extinguishing chamber 230. This is a distance Lc between a part of the first grid base 231t and a part of the second grid base 232t.

  The shortest distance La between the first grids 231 is longer than the shortest distance Lc between the first grid 231 and the second grid 232. The shortest distance La between the second grids 232 is longer than the shortest distance Lc between the first grid 231 and the second grid 232.

  Also in the circuit breaker 200 according to the present embodiment, the first grid 231 and the second grid 232 are alternately arranged so that the positions of the arc extinguishing chamber 230 in the height direction H are different from each other. The shortest distance La between the extending portions 231 s and the shortest distance La between the second grid extending portions 232 s can be increased.

  Further, each of the side portion of the first grid base portion 231t opposite to the first grid support 141 side and the side portion of the second grid base portion 232t opposite to the second grid support 142 side has a tapered shape. Have. Thereby, the shortest distance Lc between the first grid 231 and the second grid 232 adjacent in the height direction H of the arc extinguishing chamber 230 is made longer than the shortest distance Lb in the circuit breaker 100 according to the first embodiment. be able to.

  By increasing the shortest distance La between the first grid extending portions 231s, it is possible to suppress the first grids 231 from being electrically connected to each other. By increasing the shortest distance La between the second grid extending portions 232s, it is possible to prevent the second grids 232 from being electrically connected to each other. The first grid 231 and the second grid 232 are electrically connected by increasing the shortest distance Lc between the first grid 231 and the second grid 232 adjacent in the height direction H of the arc extinguishing chamber 230. This can be suppressed.

  As a result, it is possible to suppress the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 230 and to improve the breaking performance of the circuit breaker 200. By improving the breaking performance of the breaker 200, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 200 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 200 can be downsized.

  Hereinafter, the circuit breaker according to Embodiment 3 of the present invention will be described. In addition, since the circuit breaker 300 which concerns on this embodiment differs from the circuit breaker 100 which concerns on Embodiment 1 mainly in the space | interval of the 1st grid and 2nd grid in the width direction of an arc-extinguishing chamber, it demonstrates about another structure. Do not repeat.

(Embodiment 3)
FIG. 7 is a partial front view of a circuit breaker according to Embodiment 3 of the present invention. 7, the figure which looked at the circuit breaker 300 from the same direction as FIG. 2 is shown. As shown in FIG. 7, the circuit breaker 300 according to Embodiment 3 of the present invention includes an arc extinguishing chamber 330.

When viewed from the height direction H of the arc extinguishing chamber 330, the plurality of first grids 131 and the plurality of second grids 132 do not overlap with each other in the width direction W of the arc extinguishing chamber 330. That is, a region T ₁ in which no grid exists is formed between the first grid 131 and the second grid 132 in the width direction W of the arc extinguishing chamber 330.

  The shortest distance between the first grid 131 and the second grid 132 adjacent in the height direction H of the arc extinguishing chamber 330 is a distance Ld between the first grid base 131t and the second grid base 132t.

  The shortest distance La between the first grids 131 is longer than the shortest distance Ld between the first grid 131 and the second grid 132. The shortest distance La between the second grids 132 is longer than the shortest distance Ld between the first grid 131 and the second grid 132.

  Also in the circuit breaker 300 according to the present embodiment, the first grid 131 and the second grid 132 are alternately arranged so that the positions of the arc extinguishing chamber 330 in the height direction H are different from each other. The shortest distance La between the extending portions 131 s and the shortest distance La between the second grid extending portions 132 s can be increased.

  By increasing the shortest distance La between the first grid extending portions 131s, it is possible to suppress the first grids 131 from being electrically connected to each other. It is possible to suppress the second grids 132 from being electrically connected by increasing the shortest distance La between the second grid extending parts 132s.

  That the plurality of first grids 131 and the plurality of second grids 132 do not overlap each other in the width direction W of the arc extinguishing chamber 130, the first grid 131 and the second grid 132 are electrically connected. Can be suppressed.

A region T ₁ formed in the arc extinguishing chamber 330 where no grid exists serves as a flow path for arc gas. As a result, the arc 10 can be easily retained in the region T ₁ . Thereby, the arc 10 can be more stably divided.

  As a result, it is possible to improve the breaking performance of the circuit breaker 300 by suppressing the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 330. By increasing the breaking performance of the breaker 300, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 300 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 300 can be downsized.

  Hereinafter, the circuit breaker according to Embodiment 4 of the present invention will be described. The circuit breaker 400 according to the present embodiment is different from the circuit breaker 300 according to the third embodiment in that the distance between the first grid and the second grid in the width direction of the arc extinguishing chamber is narrow. The description of the configuration will not be repeated.

(Embodiment 4)
FIG. 8 is a partial front view of a circuit breaker according to Embodiment 4 of the present invention. In FIG. 8, the figure which looked at the circuit breaker 400 from the same direction as FIG. 2 is shown. As shown in FIG. 8, the circuit breaker 400 according to Embodiment 4 of the present invention includes an arc extinguishing chamber 430.

When viewed from the height direction H of the arc extinguishing chamber 430, the plurality of first grids 131 and the plurality of second grids 132 do not overlap with each other in the width direction W of the arc extinguishing chamber 430. That is, a region T ₂ where no grid exists is formed between the first grid 131 and the second grid 132 in the width direction W of the arc extinguishing chamber 430.

  The shortest distance between the first grid 131 and the second grid 132 that are adjacent in the height direction H of the arc extinguishing chamber 430 is the distance Le between the first grid base 131t and the second grid base 132t.

  The shortest distance La between the first grids 131 is longer than 2Le, which is twice the shortest distance Le between the first grid 131 and the second grid 132. The shortest distance La between the second grids 132 is longer than 2Le which is twice the shortest distance Le between the first grid 131 and the second grid 132. That is, La> 2Le is satisfied.

  Also in the circuit breaker 400 according to the present embodiment, the first grid 131 and the second grid 132 are alternately arranged so that the positions in the height direction H of the arc extinguishing chamber 430 are different from each other. The shortest distance La between the extending portions 131 s and the shortest distance La between the second grid extending portions 132 s can be increased.

  By increasing the shortest distance La between the first grid extending portions 131s, it is possible to suppress the first grids 131 from being electrically connected to each other. It is possible to suppress the second grids 132 from being electrically connected by increasing the shortest distance La between the second grid extending parts 132s.

  That the plurality of first grids 131 and the plurality of second grids 132 do not overlap each other in the width direction W of the arc extinguishing chamber 430, the first grid 131 and the second grid 132 are electrically connected. Can be suppressed.

A region T ₂ formed in the arc extinguishing chamber 430 where no grid exists is an arc gas flow path. As a result, it is possible to easily stay arc 10 in the region T _2. Thereby, the arc 10 can be more stably divided.

  As a result, it is possible to suppress the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 430 and to improve the breaking performance of the circuit breaker 400. By increasing the breaking performance of the circuit breaker 400, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 400 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 400 can be downsized.

Further, by satisfying La> 2Le, that is, Le <La / 2, the width of the region T ₂ can be reduced. As a result, the width of the arc extinguishing chamber 430 can be reduced, and the breaker 400 can be reduced in size.

  Hereinafter, the circuit breaker according to Embodiment 5 of the present invention will be described. Note that the circuit breaker 500 according to the present embodiment is different from the circuit breaker 400 according to the fourth embodiment in that the grid barrier has an exhaust port, and therefore, the description of other configurations will not be repeated.

(Embodiment 5)
FIG. 9 is a partial front view of a circuit breaker according to Embodiment 5 of the present invention. In FIG. 9, the figure which looked at the circuit breaker 500 from the same direction as FIG. 2 is shown. As shown in FIG. 9, the circuit breaker 500 according to Embodiment 5 of the present invention includes an arc extinguishing chamber 530.

When viewed from the height direction H of the arc extinguishing chamber 530, the plurality of first grids 131 and the plurality of second grids 132 do not overlap with each other in the width direction W of the arc extinguishing chamber 530. That is, a region T ₂ where no grid exists is formed between the first grid 131 and the second grid 132 in the width direction W of the arc extinguishing chamber 530.

The grid barrier 150 has an exhaust port 153 that discharges arc gas from the arc extinguishing chamber 530. The exhaust port 153 is located between the plurality of first grids 131 and the plurality of second grids 132 in the width direction W of the arc extinguishing chamber 530. That is, the exhaust port 153 is provided so as to face the region T _2.

  Also in the circuit breaker 500 according to the present embodiment, the first grid 131 and the second grid 132 are alternately arranged so that the positions in the height direction H of the arc extinguishing chamber 530 are different from each other. The shortest distance La between the extending portions 131 s and the shortest distance La between the second grid extending portions 132 s can be increased.

  By increasing the shortest distance La between the first grid extending portions 131s, it is possible to suppress the first grids 131 from being electrically connected to each other. It is possible to suppress the second grids 132 from being electrically connected by increasing the shortest distance La between the second grid extending parts 132s.

  The plurality of first grids 131 and the plurality of second grids 132 are not overlapped with each other in the width direction W of the arc extinguishing chamber 530, so that the first grid 131 and the second grid 132 are electrically connected. Can be suppressed.

A region T ₂ formed in the arc extinguishing chamber 530 and having no grid serves as a flow path for arc gas. Since the exhaust port 153 is provided so as to face the region T _2, it is possible to increase the flow rate of the arc gas flowing through the region T _2. As a result, it is possible to facilitate further remains an arc 10 in the region T _2. Thereby, the arc 10 can be more stably divided.

  As a result, it is possible to suppress the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 530, and to improve the breaking performance of the circuit breaker 500. By increasing the breaking performance of the breaker 500, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 500 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 500 can be downsized.

  Hereinafter, the circuit breaker according to Embodiment 6 of the present invention will be described. In addition, since the circuit breaker 600 which concerns on this embodiment differs in the point which has the insulating member which generate | occur | produces gas by the heat of an arc from the circuit breaker 400 which concerns on Embodiment 4, description is not repeated about another structure.

(Embodiment 6)
FIG. 10 is a partial front view of a circuit breaker according to Embodiment 6 of the present invention. In FIG. 10, the figure which looked at the circuit breaker 600 from the same direction as FIG. 2 is shown. As shown in FIG. 10, the circuit breaker 600 according to Embodiment 6 of the present invention includes an arc extinguishing chamber 630. When viewed from the height direction H of the arc extinguishing chamber 630, the plurality of first grids 131 and the plurality of second grids 132 do not overlap with each other in the width direction W of the arc extinguishing chamber 630.

  The arc extinguishing chamber 630 includes at least one insulating member that generates gas by the heat of the arc 10. In the circuit breaker 600 according to Embodiment 6 of the present invention, the first insulating member 611 is disposed between the first grid extending portions 131 s adjacent in the height direction H of the arc extinguishing chamber 630. A second insulating member 612 is disposed between the second grid extending portions 132 s adjacent in the height direction H of the arc extinguishing chamber 630.

  However, the arrangement of the insulating member is not limited to the above, and the first grid extension portions 131s adjacent to each other in the height direction H of the arc extinguishing chamber 630 in the plurality of first grids 131 and the plurality of second grids 132 are arranged. What is necessary is just to be arrange | positioned in at least one between 132s between 2nd grid extending parts.

  Further, it is not necessary that the first insulating member 611 is disposed between all of the plurality of first grid extending portions 131s, and the first insulation is provided only in a part between the plurality of first grid extending portions 131s. The sex member 611 may be disposed. The second insulating member 612 does not need to be disposed at all between the plurality of second grid extending portions 132s, and the second insulating member is provided only at a part between the plurality of second grid extending portions 132s. 612 may be arranged.

  As each material of the first insulating member 611 and the second insulating member 612, a polymer resin such as nylon 6, 6 or polyacetal can be used. However, each material of the first insulating member 611 and the second insulating member 612 is not limited to the organic insulating material, and may be an inorganic insulating material that generates gas by the heat of the arc 10.

  Ablation gas is generated by the heat of the arc 10 from each of the first insulating member 611 and the second insulating member 612. Due to the ablation gas generated from the first insulating member 611, a driving force toward the second grid support 142 in the width direction W of the arc extinguishing chamber 630 acts on the arc 10 as indicated by an arrow 21 in FIG. 10. Due to the ablation gas generated from the second insulating member 612, a driving force toward the first grid support 141 in the width direction W of the arc extinguishing chamber 630 acts on the arc 10 as indicated by an arrow 22 in FIG.

  Accordingly, the arc 10 is attracted to the first grid 131 in the vicinity of the first grid 131 and is attracted to the second grid 132 in the vicinity of the second grid 132 to be contracted. Further, the arc 10 is cooled by the ablation gas. As a result, the arc voltage increases. Thereby, the arc 10 can be more stably divided.

  Also in the circuit breaker 600 according to the present embodiment, it is possible to suppress the electrode drop voltage obtained when the arc 10 is driven in the arc extinguishing chamber 630 and to improve the circuit breaking performance of the circuit breaker 600. By increasing the breaking performance of the breaker 600, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 600 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 600 can be downsized.

  Hereinafter, the circuit breaker according to Embodiment 7 of the present invention will be described. In addition, since the circuit breaker 700 which concerns on this embodiment differs from the circuit breaker 100 which mainly concerns on the point by which the grid is being fixed to the grid barrier, it does not repeat description about another structure.

(Embodiment 7)
FIG. 11 is a partial plan view of a circuit breaker according to Embodiment 7 of the present invention. In FIG. 11, only the 2nd grid 732, the 2nd grid support 742, and the grid barrier 750 of the circuit breaker 700 which concern on Embodiment 7 of this invention are shown in figure. In the following description, the fixing structure of the second grid 732 will be described, but the same applies to the fixing structure of the first grid.

  In the circuit breaker 700 according to Embodiment 7 of the present invention, the grid barrier 750 is fixed to the first grid support and the second grid support 742.

  As shown in FIG. 11, each of the plurality of second grids 732 includes a second grid base 732 t located on one end side in the depth direction L of the arc extinguishing chamber, and a second grid support 742 from the second grid base 732 t. It includes a second grid extending portion 732s that extends toward the other end side in the depth direction L of the arc extinguishing chamber and is narrower than the second grid base portion 732t.

  The second grid base 732t is a rectangular parallelepiped portion. The second grid extending portion 732s is composed of a root portion that becomes narrower as it is away from the second grid base portion 732t, and a tip portion that is located on the distal end side of the root portion and extends with a certain width. ing. A side surface opposite to the side surface 732p in the root portion is curved convexly toward the side surface 732p.

  Each of the plurality of second grids 732 is in contact with the second grid support 742 at the side surface 732p. Each of the plurality of second grids 732 is fixed to the second grid support 742. Each of the plurality of second grids 732 is in contact with the grid barrier 750 at the end face 732q. Each of the plurality of second grids 732 is fixed to the grid barrier 750.

  Specifically, a protruding portion 732 x protruding from the side surface 732 p is provided on the side surface 732 p of the second grid 732. A protruding portion 732y protruding from the end surface 732q is provided on the end surface 732q of the second grid 732. The number of each of the protrusion part 732x and the protrusion part 732y is set suitably.

  The second grid support 742 is provided with a through-hole 742 h that fits with the protrusion 732 x at a position corresponding to the protrusion 732 x of the second grid 732. The grid barrier 750 is provided with a through-hole 750 h that fits the protrusion 732 y at a position corresponding to the protrusion 732 y of the second grid 732.

  The protrusion 732 x of the second grid 732 is fitted into the through hole 742 h of the second grid support 742, and the protrusion 732 y of the second grid 732 is fitted into the through hole 750 h of the grid barrier 750. Are fixed to the second grid support 742 and the grid barrier 750. Similarly, the first grid is fixed relative to the first grid support and grid barrier 750.

  By fixing each of the plurality of first grids and the plurality of second grids 732 as described above, the interval between the first grids and the interval between the second grids 732 can be maintained. As a result, due to the impact at the time of current interruption, the interval between the first grids is shortened and the first grids are electrically connected, and the interval between the second grids 732 is shortened and the second grid 732 is shortened. It can suppress that they are electrically connected.

  Also in the circuit breaker 700 which concerns on this embodiment, it can suppress that the electrode fall voltage obtained when driving an arc in an arc-extinguishing chamber falls, and can improve the interruption | blocking performance of the circuit breaker 700. FIG. By increasing the breaking performance of the breaker 700, arc energy can be consumed in a short time. Thereby, since the thermal and electromagnetic force load to the structure of the circuit breaker 700 can be reduced, the bulk of the structure can be reduced, and the circuit breaker 700 can be downsized.

  You may combine suitably the structures which can be combined in each structure of said Embodiment 1-7.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. In addition, meanings equivalent to the claims and all modifications within the scope are included.

  10 Arc, 100, 200, 300, 400, 500, 600, 700 Circuit breaker, 110 Movable contactor, 111 Bar-shaped part, 112 Movable contact, 112a Rotating locus, 113 Support shaft, 120 Fixed contactor, 121 Plate-shaped part 122 fixed contact, 130, 230, 330, 430, 530, 630 arc extinguishing chamber, 131, 231 first grid, 131p, 132p, 732p side face, 131q, 132q, 732q end face, 131s, 231s first grid extending part, 131t, 231t 1st grid base, 132, 232, 732 2nd grid, 132s, 232s, 732s 2nd grid extension part, 132t, 232t, 732t 2nd grid base, 140 1 pair of grid support, 141 1st grid support , 142, 742 De support, 150,750 grid barrier, 153 an exhaust port, 160 arc induction conductor, 611 first insulating member, 612 a second insulating member, 732x, 732y protrusions, 742H, 750h through hole.

Claims (7)

A stationary contact having a stationary contact;
A movable contact having a movable contact that can be moved toward and away from the fixed contact;
An arc extinguishing chamber that extinguishes an arc generated between the fixed contact and the movable contact;
The arc extinguishing chamber is
A first grid support and a second grid support that have a plate-like shape and are opposed to each other in the width direction of the arc extinguishing chamber;
A plate-like grid barrier that plugs between ends in the depth direction of the arc extinguishing chamber in each of the first grid support and the second grid support;
In a region surrounded by the first grid support, the second grid support, and the grid barrier, a plurality of first fixed in order to the first grid support at intervals in the height direction of the arc extinguishing chamber. The grid,
A plurality of second grids fixed in order to the second grid support at intervals in the height direction in a region surrounded by the first grid support, the second grid support, and the grid barrier; ,
Each of the plurality of first grids has a first grid base located on one end side in the depth direction, and toward the other end side in the depth direction while contacting the first grid support from the first grid base portion. Including a first grid extension that extends and is narrower than the first grid base;
Each of the plurality of second grids has a second grid base located on one end side in the depth direction, and the second grid base toward the other end side in the depth direction while contacting the second grid support. A second grid extension that extends and is narrower than the second grid base;
In the plurality of first grids and the plurality of second grids, the first grid and the second grid are alternately arranged so that the positions in the height direction are different from each other,
The movable contact passes along the height direction between the first grid extending portion of each of the plurality of first grids and the second grid extending portion of each of the plurality of second grids, Circuit breaker.   The circuit breaker according to claim 1, wherein the plurality of first grids and the plurality of second grids do not overlap with each other in the width direction when viewed from the height direction.   In the plurality of first grids and the plurality of second grids, the shortest distance between the first grids adjacent in the height direction or between the second grids is the same as that of the first grid adjacent in the height direction. The circuit breaker of Claim 1 or Claim 2 longer than the shortest distance with 2 grids. The grid barrier has an exhaust port for discharging arc gas from the arc extinguishing chamber,
The circuit breaker according to claim 2 or 3, wherein the exhaust port is positioned between the plurality of first grids and the plurality of second grids in the width direction. At least one insulating member that generates gas by the heat of the arc;
The insulating member is adjacent to at least one of the first grid extending portions and the second grid extending portions adjacent to each other in the height direction in the plurality of first grids and the plurality of second grids. The circuit breaker according to any one of claims 1 to 4, wherein the circuit breaker is arranged. The grid barrier is connected to a lower end of the height direction in each of the first grid support and the second grid support;
The circuit breaker according to any one of claims 1 to 5, wherein the grid barrier is elastically deformed by a pressure of arc gas in the arc extinguishing chamber.   The circuit breaker according to any one of claims 1 to 5, wherein each of the plurality of first grids and the plurality of second grids is fixed to the grid barrier.

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