Arc extinguishing device

Abstract

To reduce the burden of work to complete a circuit interrupter.SOLUTION: A circuit interrupter 1 that extinguishes an arc that occurs when a contact is opened in a circuit breaker that has a fixed contact with a fixed contact and a movable contact with a movable contact includes an exhaust surface portion 12 having an exhaust hole 11 that exhausts arc gas of the generated arc, and a plurality of arc-extinguishing plates used to guide the arc, and each of the arc-extinguishing plates protrudes to one side of the exhaust surface portion by bending a member having a portion that serves as the exhaust surface portion.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an arc extinguishing device. [Background technology]

[0002] When a short circuit current flows, the movable contact is opened by the operating mechanism installed in the circuit breaker. When the movable contact is opened, a discharge (arc) occurs between the movable contact and the fixed contact, but this arc is attracted by the arc-extinguishing plate installed in the arc-extinguishing device and extinguished by the arc-extinguishing gas in the arc-extinguishing chamber case. This is a technology that utilizes the fact that the arc is attracted to the side with higher magnetic flux density, and the magnetic flux density of the magnetic field generated on the periphery by the current flowing between the contacts is made higher on the arc-extinguishing plate side, thereby attracting the arc to the arc-extinguishing plate side.

[0003] As described in Patent Document 1, a conventional arc extinguishing device is composed of an arc extinguishing chamber case and a plurality of arc extinguishing plates made of a magnetic material. The arc extinguishing chamber case is composed of an exhaust section that exhausts arc gas while preventing foreign matter from entering the case, and side walls extending from both ends of the exhaust section. Arc extinguishing plates are attached to the arc extinguishing chamber case, and typically a plurality of arc extinguishing plates are arranged in the vertical direction relative to the arc extinguishing chamber case and fixed to the side walls. The arc extinguishing chamber case is composed of an insulating material that releases an arc extinguishing gas when heated. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-238676 A

[0005] In the conventional arc extinguishing device, multiple arc extinguishing plates are press-fitted into an arc extinguishing chamber case made of an insulating material, which requires the press-fitting of small parts and requires a large number of parts, making the assembly work a burden. Summary of the Invention [Problem to be solved by the invention]

[0006] The inventors of the present invention have made extensive research into this issue and have attempted to solve the problem. The problem that the present invention aims to solve is to reduce the burden of work required to complete an arc extinguishing device. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides an arc extinguishing device that extinguishes an arc that occurs when a circuit breaker having a fixed contact and a movable contact having a movable contact is opened, the arc extinguishing device comprising an exhaust surface portion having an exhaust hole for discharging arc gas of the generated arc, and a plurality of arc extinguishing plate portions used to guide the arc, and wherein each of the arc extinguishing plate portions protrudes to one side of the exhaust surface portion by bending a member having a portion that becomes the exhaust surface portion.

[0008] It is also preferable that the exhaust surface portion has a first arc-extinguishing plate portion formed by a portion protruding to one side from the lower end of the exhaust surface portion, and a second arc-extinguishing plate portion formed by a portion protruding to one side from at least one of the left and right ends of the exhaust surface portion.

[0009] In addition, it is preferable that the second arc-extinguishing plate portion has, at least on one of the left and right ends of the exhaust surface portion, a bent side continuing from the exhaust surface portion to the bent portion, and a vertical side continuing from the bent side to the bent portion and capable of forming a space between the first arc-extinguishing plate portion and the exhaust surface portion, in which arc gas can be guided toward the exhaust surface portion, and that a gas passage is formed between the vertical side and the exhaust surface portion.

[0010] It is also preferable to have a left plate portion protruding to one side of the exhaust surface portion so as to be continuous with the left end portion of the exhaust surface portion, and a right plate portion protruding to one side of the exhaust surface portion so as to be continuous with the right end portion of the exhaust surface portion, with a gap provided between the left plate portion and the right plate portion. Effect of the Invention

[0011] According to the present invention, it is possible to reduce the burden of work required to complete an arc extinguishing device. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view of the arc extinguishing device according to the embodiment, seen obliquely from above. [Diagram 2] 2 is a perspective view of the arc extinguishing device shown in FIG. 1, seen from the opposite side. [Diagram 3] 2 is a view of the arc-extinguishing device shown in FIG. 1 as viewed obliquely from above on the exhaust surface side. [Figure 4] 2 is a perspective view of the arc-extinguishing device shown in FIG. 1, as viewed obliquely from below. [Diagram 5] FIG. 2 is an exploded view of the arc extinguishing device shown in FIG. [Figure 6] 2 is a diagram showing the relationship between the fixed contact and the movable contact when the arc-extinguishing device shown in Fig. 1 is installed in a circuit breaker, where (i) is an example in which the first arc-extinguishing plate part is inclined toward the movable contact when the contacts are closed, (ii) is an example in which the first arc-extinguishing plate part extends in a direction perpendicular to the exhaust surface part, and (iii) is an example in which the first arc-extinguishing plate part is inclined toward the fixed contact. [Figure 7] FIG. 13 is a perspective view of an arc extinguishing device having a right plate portion and no left plate portion, as viewed obliquely from above. [Figure 8] FIG. 8 is an exploded view of the arc-extinguishing device shown in FIG. [Figure 9] FIG. 1 is a perspective view of an example of a circuit breaker. However, the dimensions are given to make it easier to imagine the size of the arc extinguishing device, and the scope of the invention does not necessarily include an arc extinguishing device that can be accommodated in a circuit breaker of this size. [Figure 10] FIG. 10 is an exploded perspective view of the circuit breaker shown in FIG. [Figure 11] 7 is an image diagram showing an example of the behavior of an arc when the first arc extinguishing device is set as in the example shown in (i) of Fig. 6. Here, the arc is shown by a dashed line. [Figure 12]This is an image showing an example of the movement of the magnetic flux and the arc around the arc extinguishing device shown in Fig. 11. However, this is an image seen from above the arc extinguishing device, etc. The magnetic flux is shown by a dashed line, and the direction in which the arc is pulled is shown by a thick arrow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The following describes an embodiment of the invention. As can be understood from Fig. 1 to Fig. 6, the arc extinguishing device 1 of this embodiment is for extinguishing an arc that occurs when a circuit breaker 8 having a fixed contact 82 with a fixed contact 81 and a movable contact 84 with a movable contact 83 is opened, and this arc extinguishing device 1 includes an exhaust surface portion 12 having an exhaust hole 11 for discharging arc gas of the generated arc, and a plurality of arc extinguishing plate portions used for guiding the arc, and each of the arc extinguishing plate portions is made to protrude to one side of the exhaust surface portion 12 by bending a member having a portion that becomes the exhaust surface portion 12. Therefore, the number of parts can be reduced, and the press-fitting work can be eliminated, so that the burden of work for completing the arc extinguishing device 1 can be suppressed.

[0014] Here, a representative arc extinguishing device 1 will be described. This arc extinguishing device 1 is made by hollowing out and bending a single plate into a specific shape, to form an arc extinguishing device 1 having an exhaust surface portion 12 and an arc extinguishing plate portion. In the example shown in Fig. 1 to Fig. 5, the arc extinguishing device 1 is made by bending a hollowed-out member from an iron plate. It is not necessary to use an iron plate when making the arc extinguishing device 1, but it is preferable to use a magnetic material.

[0015] 1, the arc-extinguishing plate portion is configured to have two stages in the vertical direction. More specifically, by bending a member, the arc-extinguishing plate portion is configured to have a rectangular plate-shaped exhaust surface portion 12, a first arc-extinguishing plate portion 41 protruding to one side from the lower end of the exhaust surface portion 12, and a second arc-extinguishing plate portion 42 located above the first arc-extinguishing plate portion 41.

[0016] A configuration including a first arc-extinguishing plate 41 formed by a portion protruding to one side from the lower end of the exhaust surface portion 12, and a second arc-extinguishing plate 42 formed by a portion protruding to one side from at least one of the left and right ends of the exhaust surface portion 12 allows the arc-extinguishing plate portions to be bent at different locations, thereby increasing the degree of freedom in the shape and size of the arc-extinguishing plate portions. In addition, the presence of a portion protruding to one side from at least one of the left and right ends of the exhaust surface portion 12 makes it easier to guide gas to the exhaust hole 11 provided in the exhaust surface portion 12.

[0017] In this example, in order to configure the second arc-extinguishing plate section 42, a left plate section 71 protruding to one side from the left end section of the exhaust surface section 12 and a right plate section 72 protruding to one side from the right end section of the exhaust surface section 12 are provided. By providing portions protruding to one side from both the left and right ends of the exhaust surface section 12 in this manner, it becomes easier to guide gas to the exhaust hole 11 provided in the exhaust surface section 12. In addition, since the distance from the part supported by the exhaust surface section 12 to the tip can be reduced, a structure with strength that is difficult to deform can be obtained, and sagging of the arc-extinguishing plate section can be suppressed. In addition, by providing a gap 74 between the left plate section 71 and the right plate section 72, the passage through which gas flows toward the exhaust hole 11 can be widened.

[0018] Since the first arc-extinguishing plate 41 is formed by bending a member having a portion that becomes the exhaust surface 12, the first arc-extinguishing plate 41 can be positioned close to the fixed contact 81 by adjusting the bending angle. In other words, the arc-extinguishing plate can be adjusted to be positioned close to the fixed contact 81 by adjusting the angle between the exhaust surface 12 and the first arc-extinguishing plate 41. If the angle of the first arc-extinguishing plate 41 is adjusted to match the position of the fixed contact 81, the first arc-extinguishing plate 41 functions sufficiently as a guide, making it easier to draw the arc into the arc extinguishing device 1. FIG. 6 shows an example in which the angle of the first arc-extinguishing plate 41 is changed.

[0019] In the embodiment, the left plate portion 71 and the right plate portion 72 have a folded side 61 protruding from the left end portion and the right end portion of the exhaust surface portion 12, and a vertical side 62 is formed to form an angle with the folded side 61. In the embodiment, a gas passage 29 through which gas can pass is formed between the vertical side 62 and the exhaust surface portion 12. More specifically, the folded side 61 supports the vertical side 62 so as to provide a gap between the exhaust surface portion 12 and the vertical side 62, thereby forming the gas passage 29 between the exhaust surface portion 12 and the vertical side 62.

[0020] In the above example, both the right plate portion 72 and the left plate portion 71 extend from the exhaust surface portion 12 to form the second arc-extinguishing plate portion 42. However, it is not necessary to form both the right plate portion 72 and the left plate portion 71 extend from the exhaust surface portion 12 to form the second arc-extinguishing plate portion 42. In the example shown in FIG. 7 and FIG. 8, the left plate portion 71 is not provided, and only the right plate portion 72 is provided. In addition, when the configuration is provided with only the right plate portion 72 or the left plate portion 71, a V-shaped groove 64 may be provided to open the track of the movable contact 84. In this case, it is preferable to configure the first arc-extinguishing plate portion 41 so as not to become too small while ensuring the strength of the portion narrowed by providing the V-shaped groove 64.

[0021] Incidentally, the arc extinguishing device 1 of the embodiment can be built into a circuit breaker 8 as shown in Fig. 9. As can be seen from Fig. 10, the arc extinguishing device 1 is housed in a base portion 88 that houses the main mechanism of the circuit breaker 8. In the example shown in Figs. 9 and 10, the arc extinguishing device 1 is disposed on each pole of the circuit breaker 8, so that three arc extinguishing devices 1 are housed in the circuit breaker 8.

[0022] By attaching the cover portion 89 to the base portion 88, the circuit breaker 8 having a roughly rectangular parallelepiped shape can draw the arc toward the arc extinguishing device 1 when an arc occurs inside (see Figs. 11 and 12). If the exhaust surface portion 12 and the bent edge 61 are made of a magnetic material, the arc can be easily drawn toward the arc extinguishing device 1.

[0023] At this time, the generated gas can be exhausted to the outside of the circuit breaker 8 through the exhaust holes 11 provided in the exhaust surface portion 12 and the opening provided in the base portion 88. To enable this, the arc extinguishing device 1 is housed in the base portion 88 of the circuit breaker 8, and the exhaust surface portion 12 is disposed so as to face the opening provided in the base portion that leads to the outside.

[0024] Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be embodied in various forms. [Explanation of symbols]

[0025] 1 Arc extinguisher 8. Circuit Breakers 11 Exhaust Vent 12 Exhaust surface 29 Gas passage 41 First arc-extinguishing plate section 42 Second arc-extinguishing plate section 61 Folded Edge 62 Vertical Edge 71 Left plate part 72 Right plate 74 Gap 81 Fixed contacts 82 Fixed contact 83 Movable contact 84 Movable Contact

Claims

1. An exhaust surface portion having an exhaust hole for discharging arc gas of a generated arc; A plurality of arc-extinguishing plate portions are provided for guiding an arc; The arc extinguishing plate portion is formed by bending a member having a portion that becomes an exhaust surface portion, a first arc-extinguishing plate portion formed by a portion protruding to one side from a lower end of the exhaust surface portion; A second arc-extinguishing plate portion formed by a portion protruding to one side from at least one of the left and right ends of the exhaust surface portion; Equipped with An arc extinguishing device for extinguishing an arc that occurs when a contact is opened in a circuit breaker having a fixed contact and a movable contact, the device comprising: The second arc-extinguishing plate portion has a bent side extending from the exhaust surface portion to a bent portion at at least one of the left and right ends of the exhaust surface portion, a side continuing from the bent side to the bent portion, the side being capable of forming a space capable of directing the arc gas to the exhaust surface portion side between the first arc-extinguishing plate portion and the side, An arc extinguishing device in which a gas passage is formed between the exhaust surface and the edge continuing from the bent edge to the bent portion.

2. a left plate portion that protrudes to one side of the exhaust surface portion so as to be continuous with a left end portion of the exhaust surface portion; a right plate portion that protrudes to one side of the exhaust surface portion so as to be continuous with a right end portion of the exhaust surface portion; 2. The arc extinguishing device according to claim 1, wherein a gap is provided between the left plate portion and the right plate portion.

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